CN115123162B - Vehicle braking system - Google Patents

Vehicle braking system Download PDF

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Publication number
CN115123162B
CN115123162B CN202210873383.8A CN202210873383A CN115123162B CN 115123162 B CN115123162 B CN 115123162B CN 202210873383 A CN202210873383 A CN 202210873383A CN 115123162 B CN115123162 B CN 115123162B
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China
Prior art keywords
module
pressure reducing
valve
reducing valve
instruction
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CN202210873383.8A
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Chinese (zh)
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CN115123162A (en
Inventor
张�杰
王志伟
孙科
汪冬亮
张东方
黄美娟
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China Automotive Innovation Co Ltd
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China Automotive Innovation Co Ltd
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Priority to CN202210873383.8A priority Critical patent/CN115123162B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02—Application and release valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The application relates to the technical field of vehicle control, in particular to a vehicle braking system; the vehicle braking system comprises a braking controller, a pressure increasing valve driving module, a pressure reducing valve scheduling module and a pressure reducing valve scheduling module, wherein the braking controller is used for sending a first braking instruction to the pressure increasing valve driving module and sending a second braking instruction to the pressure reducing valve scheduling module; the booster valve driving module is used for controlling the opening and closing of the booster valve based on the first braking instruction; the pressure increasing valve state detection module is used for detecting opening and closing state information of the pressure increasing valve and transmitting the opening and closing state information to the pressure reducing valve scheduling module; the pressure reducing valve scheduling module is used for generating a pressure reducing valve working instruction based on the second braking instruction and the opening and closing state information; the pressure reducing valve working order enables the pressure increasing valve and the pressure reducing valve not to be opened at the same time; according to the vehicle braking system, the opening and closing state information of the pressure increasing valve is prevented from being transmitted back to the braking controller while the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, so that the braking efficiency is improved, and the braking safety is improved.

Description

Vehicle braking system
Technical Field
The application relates to the technical field of vehicle control, in particular to a vehicle braking system.
Background
The brake control system is a system for controlling a vehicle to brake, and is generally provided with a pressure reducing valve and a pressure increasing valve in order to improve braking accuracy and realize anti-lock control; the pressure increasing valve is in a normally open state, and the pressure reducing valve is in a normally closed state; under the condition of normal braking, the pressure increasing valve is kept open, and the pressure reducing valve is kept closed; under the condition of larger braking force, a controller in the braking control system can send a closing signal to a pressure increasing valve driving device to control the pressure increasing valve to be closed, and send an opening signal to a pressure reducing valve driving device to control the pressure reducing valve to be opened, so that pressure relief is realized, and the braking force is adjusted.
In the prior art, if the signal transmission time is difficult to keep synchronous or is subjected to specific interference in the transmission process of the closing signal and the opening signal, the possibility that the pressure increasing valve and the pressure reducing valve are simultaneously opened is caused, so that braking safety faults are caused; if the pressure increasing valve is detected to be closed and then an opening signal is sent to the pressure reducing valve driving device, the braking time is long, and the braking force control is reduced.
Disclosure of Invention
The present application aims to solve the above problems of the prior art, and to avoid the need of returning the opening and closing state information of a pressure increasing valve to a brake controller while simultaneously opening the pressure increasing valve and the pressure reducing valve, thereby improving the braking efficiency and the braking safety.
In order to solve the above problems, the present application provides a vehicle braking system, including a brake controller, a pressure increasing valve, a pressure reducing valve, a pressure increasing valve driving module, a pressure increasing valve state detecting module, and a pressure reducing valve scheduling module, wherein the brake controller is configured to send a first braking instruction to the pressure increasing valve driving module, and send a second braking instruction to the pressure reducing valve scheduling module;
the booster valve driving module is used for controlling the opening and closing of the booster valve based on the first braking instruction;
The pressure increasing valve state detection module is used for detecting opening and closing state information of the pressure increasing valve and transmitting the opening and closing state information to the pressure reducing valve scheduling module;
The pressure reducing valve scheduling module is used for generating a pressure reducing valve working instruction based on the second braking instruction and the opening and closing state information; the pressure reducing valve working order enables the pressure increasing valve and the pressure reducing valve not to be opened at the same time.
In the embodiment of the application, the pressure reducing valve scheduling module comprises an information fusion module, wherein the information fusion module is used for fusing the opening and closing state information and the second braking instruction to obtain a fusion result; and generating the pressure reducing valve working instruction based on the fusion result.
In the embodiment of the application, the information fusion module comprises an information judgment module and an instruction generation module;
the information judging module is used for judging whether the opening and closing state information is matched with the second braking instruction or not;
The instruction generation module is used for determining the second braking instruction as the pressure reducing valve working instruction under the condition that the opening and closing state information is matched with the second braking instruction, and determining the pressure reducing valve working instruction as the pressure reducing valve closing instruction under the condition that the opening and closing state information is not matched with the second braking instruction.
In the embodiment of the application, the information judging module comprises a first judging module, a second judging module and a third judging module;
The first judging module is used for judging that the opening and closing state information is matched with the second braking instruction under the condition that the opening and closing state information represents that the pressure increasing valve is closed and the second braking instruction represents that the pressure reducing valve is controlled to be opened;
the second judging module is used for judging that the opening and closing state information is matched with the second braking instruction under the condition that the second braking instruction characterizes and controls the pressure reducing valve to be closed;
The third judging module is used for judging that the opening and closing state information is not matched with the second braking instruction under the condition that the opening and closing state information characterizes that the pressure increasing valve is opened and the second braking instruction characterizes that the pressure reducing valve is controlled to be opened.
In the embodiment of the application, the state detection module of the booster valve comprises a high-side current monitoring module, a low-side current monitoring module and a state information output module;
The high-side current monitoring module is used for monitoring a first voltage of the booster valve close to a power supply end;
The low-side current monitoring module is used for monitoring a second voltage of the booster valve far away from a power supply end;
The state information output module is used for determining the opening and closing state information based on the first voltage and the second voltage, and sending the opening and closing state information to the pressure reducing valve scheduling module.
In an embodiment of the present application, the high-side current monitoring module includes a first filtering module, where the first filtering module is configured to reduce voltage fluctuation of the first voltage;
the low-side current monitoring module comprises a second filtering module, wherein the second filtering module is used for reducing voltage fluctuation of the second voltage.
In the embodiment of the application, the device also comprises a first quick shut-off module and a second quick shut-off module,
The first quick turn-off module is used for determining a time node for sending the first braking instruction to the booster valve driving module based on the instruction type of the first braking instruction;
The second quick shut-off module is used for determining a time node for sending the pressure reducing valve working instruction to the pressure reducing valve driving module based on the instruction type of the pressure reducing valve working instruction.
In the embodiment of the application, the first quick turn-off module comprises a first cache module, and the second quick turn-off module comprises a second cache module;
The first buffer module is used for deferring a time node for sending the first control instruction to the booster valve driving module under the condition that the first brake instruction characterizes and controls the booster valve to be opened;
The second buffer module is used for deferring a time node for sending the pressure reducing valve working instruction to the pressure reducing valve driving module under the condition that the pressure reducing valve working instruction characterizes and controls the pressure reducing valve to be opened.
In the embodiment of the application, the system further comprises an information transmission module, wherein the information transmission module is used for determining a time node for sending the opening and closing state information to the pressure reducing valve scheduling module based on the state type of the opening and closing state information.
In the embodiment of the application, the information transmission module includes a third buffer module, and the third buffer module is configured to delay sending the time node of the open-close state information to the pressure reducing valve scheduling module when the open-close state information indicates that the pressure increasing valve is in a closed state.
In the embodiment of the application, the application also comprises a first overcurrent protection module and a second overcurrent protection module,
The first overcurrent protection module is used for monitoring current flowing through the booster valve and controlling the working state of the booster valve driving module based on the current in the booster valve;
The second overcurrent protection module is used for monitoring the current flowing through the pressure reducing valve and controlling the working state of the pressure increasing valve driving module based on the current in the pressure reducing valve.
In the embodiment of the application, the first overcurrent protection module comprises a first protection driving module, and the second overcurrent protection module comprises a second protection driving module;
The first protection driving module is used for controlling the booster valve driving module to stop working under the condition that the current in the booster valve exceeds a first preset current threshold value;
The second protection driving module is used for controlling the pressure reducing valve driving module to stop working under the condition that the current in the pressure reducing valve exceeds a second preset current threshold value.
In the embodiment of the application, the first overcurrent protection module comprises a first feedback module, and the second overcurrent protection module comprises a second feedback module;
the first feedback module is used for feeding back the overcurrent information of the booster valve to the brake controller under the condition that the current in the booster valve exceeds the first preset current threshold value;
the second feedback module is used for feeding back the overcurrent information of the pressure reducing valve to the brake controller under the condition that the current in the pressure reducing valve exceeds the second preset current threshold value.
Due to the technical scheme, the vehicle braking system has the following beneficial effects:
According to the vehicle braking system, the pressure increasing valve state detection module and the pressure reducing valve scheduling module are arranged, the pressure reducing valve working instruction is generated based on the opening and closing information of the pressure increasing valve and the second braking instruction sent by the braking controller, so that the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, safety interlocking is realized, and braking safety is improved; the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, and meanwhile, the opening and closing state information of the pressure increasing valve is not required to be transmitted back to the brake controller, so that the brake efficiency is improved, and the brake safety is improved.
Drawings
In order to more clearly illustrate the technical solution of the present application, the following description will make a brief introduction to the drawings used in the description of the embodiments or the prior art. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a vehicle braking system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a pressure reducing valve scheduling module in a vehicle braking system according to an embodiment of the present application;
Fig. 3 is a schematic structural diagram of a state detection module of a boost valve in a vehicle braking system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a first quick shutdown module in a vehicle braking system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a second quick shutdown module in a vehicle braking system according to an embodiment of the present application;
Fig. 6 is a schematic structural diagram of an information transmission module in a vehicle braking system according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a first overcurrent protection module in a vehicle brake system according to an embodiment of the application;
Fig. 8 is a schematic structural diagram of a second overcurrent protection module in a vehicle brake system according to an embodiment of the application;
fig. 9 is a schematic structural view of a vehicle braking system according to an embodiment of the present application.
The device comprises a 1-information fusion AND gate circuit, a 2-high-side monitoring resistor, a 3-booster valve coil, a 4-high-side voltage dividing resistor, a 5-low-side monitoring resistor, a 6-low-side voltage dividing resistor, a 7-state information NOT gate circuit, an 8-state information AND gate circuit, a 9-first filter capacitor, a 10-second filter capacitor, an 11-first storage capacitor, a 12-second storage capacitor, a 13-first strengthening resistor, a 14-first strengthening diode, a 15-second strengthening resistor, a 16-second strengthening diode, a 17-third storage capacitor, a 18-fourth storage capacitor, a 19-third strengthening resistor, a 20-fourth strengthening resistor, a 21-third strengthening diode, a 22-protection resistor, a 23-current sampling resistor, a 24-current limiting resistor, a 25-overcurrent protection voltage stabilizing tube, a 26-overcurrent protection driving tube, a 261-first overcurrent protection driving tube, a 262-second overcurrent protection driving tube and a 27-bias resistor.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the application. In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
Referring to fig. 1, a vehicle braking system provided by an embodiment of the present application is described, where the system includes a brake controller, a pressure increasing valve, a pressure reducing valve, a pressure increasing valve driving module, a pressure increasing valve status detecting module, and a pressure reducing valve scheduling module; the output end of the brake controller is respectively connected with the input ends of the pressure increasing valve driving module and the pressure reducing valve scheduling module; the booster valve driving module is in driving connection with the booster valve; the input end of the pressure increasing valve state detection module is connected with the pressure increasing valve, and the output end of the pressure increasing valve state detection module is connected with the input end of the pressure reducing valve scheduling module; the output end of the pressure reducing valve scheduling module is in driving connection with the pressure reducing valve.
The brake controller is used for sending a first brake instruction to the pressure increasing valve driving module and sending a second brake instruction to the pressure reducing valve scheduling module; the first braking instruction refers to an instruction for controlling the opening and closing of the pressure increasing valve, and specifically, the first braking instruction comprises the opening of the pressure increasing valve and the closing of the pressure increasing valve; the second braking instruction refers to an instruction for controlling the opening and closing of the pressure reducing valve, and specifically, the second braking instruction includes controlling the opening of the pressure reducing valve and controlling the closing of the pressure reducing valve.
The boost valve driving module is used for controlling the opening and closing of the boost valve based on the first braking instruction.
The pressure increasing valve state detection module is used for detecting opening and closing state information of the pressure increasing valve and transmitting the opening and closing state information to the pressure reducing valve scheduling module; the opening and closing state information refers to the opening and closing state of the pressure increasing valve, and specifically, the opening and closing state information includes that the pressure increasing valve is in an opening state and the pressure reducing valve is in a closing state.
The pressure reducing valve scheduling module is used for generating a pressure reducing valve working instruction based on the second braking instruction and the opening and closing state information; the pressure reducing valve working order enables the pressure increasing valve and the pressure reducing valve not to be opened at the same time; the pressure reducing valve working command refers to a command for controlling the opening and closing of the pressure reducing valve, and concretely, the pressure reducing working command comprises the opening of the pressure reducing valve and the closing of the pressure reducing valve.
According to the embodiment of the application, the pressure-increasing valve state detection module and the pressure-reducing valve scheduling module are arranged, and the pressure-reducing valve working instruction is generated based on the opening and closing information of the pressure-increasing valve and the second braking instruction sent by the braking controller, so that the pressure-increasing valve and the pressure-reducing valve are prevented from being opened simultaneously, safety interlocking is realized, and the braking safety is further improved; the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, and meanwhile, the opening and closing state information of the pressure increasing valve is not required to be transmitted back to the brake controller, so that the brake efficiency is improved, and the brake safety is improved.
In the embodiment of the application, the vehicle braking system further comprises a pressure reducing valve driving module, and the output end of the pressure reducing valve scheduling module is connected with the input end of the pressure reducing valve driving module; the pressure reducing valve driving module is in driving connection with the pressure reducing valve and is used for controlling the opening and closing of the pressure reducing valve based on working instructions of the pressure reducing valve.
In another embodiment of the present application, the pressure relief valve scheduling module includes a pressure relief valve actuation module.
In an embodiment of the application, the vehicle brake system further comprises a pedal connected to an input of the brake controller, the pedal being adapted to provide a pedal stroke, the brake controller generating the first brake command and the second brake command based on the pedal stroke.
In an embodiment of the application, the vehicle brake system further comprises a connector, wherein the pedal is connected with the brake controller through the connector, and the connector is used for converting pedal travel into pedal signals and transmitting the pedal signals to the brake controller; the brake controller generates a first brake command and a second brake command based on the pedal signal.
In an embodiment of the application, the vehicle brake system further comprises a vehicle-mounted power supply, wherein the vehicle-mounted power supply is used for supplying power to the brake controller.
In the embodiment of the application, the pressure reducing valve scheduling module comprises an information fusion module, wherein the information fusion module is used for fusing the opening and closing state information and the second braking instruction to obtain a fusion result; and generating a pressure reducing valve working instruction based on the fusion result.
In the embodiment of the application, the information fusion module comprises an information judgment module and an instruction generation module; the input end of the information judging module is respectively connected with the output end of the brake controller and the output end of the booster valve state detecting module, and the output end of the information judging module is connected with the input end of the instruction generating module; the output end of the instruction generating module is connected with the input end of the pressure reducing valve driving module.
The information judging module is used for judging whether the opening and closing state information is matched with the second braking instruction or not.
The instruction generation module is used for determining the second braking instruction as a pressure reducing valve working instruction under the condition that the opening and closing state information is matched with the second braking instruction, and determining the pressure reducing valve working instruction as a pressure reducing valve closing instruction under the condition that the opening and closing state information is not matched with the second braking instruction.
In the embodiment of the application, the information judging module comprises a first judging module, a second judging module and a third judging module.
The first judging module is used for judging that the opening and closing state information is matched with the second braking instruction under the condition that the opening and closing state information represents that the pressure increasing valve is closed and the second braking instruction represents that the pressure reducing valve is controlled to be opened; at this time, the instruction generation module determines the second braking instruction as a pressure reducing valve working instruction, that is, the pressure reducing valve working instruction at this time is to control the pressure reducing valve to be opened; the pressure increasing valve and the pressure reducing valve cannot be in an opening state at the same time, so that under the condition that the opening state information indicates that the pressure increasing valve is closed and the second braking instruction indicates that the pressure reducing valve is controlled to be opened, the condition that the pressure increasing valve and the pressure reducing valve cannot be in the opening state at the same time is met, and the pressure increasing valve and the pressure reducing valve are matched.
The second judging module is used for judging that the opening and closing state information is matched with the second braking instruction under the condition that the second braking instruction characterizes and controls the pressure reducing valve to be closed; at this time, the instruction generation module determines the second brake instruction as a pressure reducing valve operation instruction, that is, the pressure reducing valve operation instruction at this time is to control the pressure reducing valve to be closed; the pressure increasing valve and the pressure reducing valve cannot be in an opening state at the same time, so that the condition that the second braking instruction indicates that the pressure reducing valve is controlled to be closed accords with the premise that the pressure increasing valve and the pressure reducing valve cannot be in the opening state at the same time, and therefore the pressure increasing valve and the pressure reducing valve are adaptive.
The third judging module is used for judging that the opening and closing state information is not matched with the second braking instruction under the condition that the opening and closing state information represents that the pressure increasing valve is opened and the second braking instruction represents that the pressure reducing valve is controlled to be opened; at this time, the relief valve operation instruction is determined to control (hold) the relief valve to close; because the pressure increasing valve and the pressure reducing valve cannot be in the opening state at the same time, under the condition that the opening and closing state information indicates that the pressure increasing valve is opened and the second braking instruction indicates that the pressure reducing valve is controlled to be opened, the condition that the pressure increasing valve and the pressure reducing valve cannot be in the opening state at the same time is not met, and therefore the pressure increasing valve and the pressure reducing valve are not matched.
In the embodiment of the application, under the condition that the pressure increasing valve is opened, the instruction for controlling the opening of the pressure reducing valve is shielded, so that the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, and the braking safety is further improved.
Referring to fig. 2, in an embodiment of the present application, the information fusion module may be an information fusion and gate 1; specifically, the information fusion and gate circuit 1 is an information judgment module, which is a circuit near the input end, and the gate circuit is an instruction generation module, which is a circuit near the output end.
In the specific embodiment of the application, under the condition that the booster valve is in a closed state, the opening and closing state information output by the booster valve state detection module is in a high level, namely logic 1; under the condition that the booster valve is in an open state, the opening and closing state information output by the booster valve state detection module is in a low level, namely logic 0; in the case of controlling the opening of the pressure-reducing valve, the second braking command is of high frequency, i.e. logic 1; in the case of controlling the pressure reducing valve to close, the second brake command is low, i.e., logic 0.
In the working logic of the information fusion and gate circuit 1, logic 1 can be output only when the input ends are all logic 1, namely, the open-close state information represents that high level (logic 1) is output when the pressure increasing valve is in a closed state (logic 1) and the second braking instruction controls the pressure reducing valve to be opened (logic 1), namely, the pressure reducing valve is controlled to be opened; in the case of inputs which are not all logic 1, a logic 0 is output, i.e. in the case of a second brake command indicating that the control pressure-reducing valve is closed (logic 0), or in the case of open-close state information indicating that the pressure-increasing valve is open (logic 0), and a second brake command indicating that the control pressure-reducing valve is open (logic 1), a low level is output (logic 0), i.e. the control pressure-reducing valve is closed.
In the specific embodiment of the application, under the condition that the pressure increasing valve is opened, the opening instruction of the pressure reducing valve is shielded and controlled by adopting a simple AND gate circuit, so that the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, and the manufacturing cost of a vehicle braking system is reduced; and the signal transmission rapidity is improved, and the braking safety is further improved.
In other embodiments of the present application, the information fusion module may be other logic gates or a combination of other logic gates; or gate circuit, nand gate circuit, nor gate circuit; under the condition of adopting different logic circuits, the corresponding judging logic is different, and the output logic of the pressure increasing valve state detection module and the control pressure reducing valve opening and closing logic need to be correspondingly modified; and will not be described in detail herein.
In the embodiment of the application, the state detection module of the booster valve comprises a high-side current monitoring module, a low-side current monitoring module and a state information output module; the input end of the high-side current monitoring module is connected with the positive electrode of the booster valve coil 3; the input end of the low-side current monitoring module is connected with the negative electrode of the booster valve coil 3; the output end of the high-point current monitoring module and the output end of the bottom edge current monitoring module are respectively connected with the input end of the state information output module; the output end of the state information output module is connected with the input end of the pressure reducing valve scheduling module.
The high-side current monitoring module is used for monitoring a first voltage of the booster valve close to the power supply end; i.e. the voltage value at the positive terminal of the pressure increasing valve coil 3.
The low-side current monitoring module is used for monitoring a second voltage of the booster valve far away from the power supply end; i.e. the voltage value at the negative end of the boost valve coil 3.
The state information output module is used for determining opening and closing state information based on the first voltage and the second voltage and sending the opening and closing state information to the pressure reducing valve scheduling module.
Referring to fig. 3, in a specific embodiment of the present application, the high-side current monitoring module may be a high-side current monitoring circuit, and specifically, the high-side current monitoring circuit includes a high-side monitoring resistor 2, where the high-side monitoring resistor 2 is connected in parallel with an anode of the booster valve coil 3; one end of the high-side monitoring resistor 2 is connected with the positive electrode of the booster valve coil 3, the other end of the high-side monitoring resistor 2 is respectively connected with a power ground end and a state information output module, and the potential of the power ground end is 0; the voltage of the high-side monitoring resistor 2 is monitored, so that the voltage value of the positive electrode end of the booster valve is monitored; the voltage value of the positive electrode end of the booster valve is monitored by setting a simple resistor structure, so that the manufacturing cost of the vehicle braking system is reduced.
In the specific embodiment of the application, the high-side current monitoring circuit further comprises a high-side voltage dividing resistor 4, the high-side voltage dividing resistor 4 is connected with the booster valve coil 3 in series, specifically, one end of the high-side voltage dividing resistor 4 is connected with the positive electrode of the booster valve coil 3, and the other end of the high-side voltage dividing resistor 4 is respectively connected with the high-side monitoring resistor 2 and the state information output module; through setting up high limit bleeder resistor 4, and then reduce the voltage of high limit monitoring resistance 2 to improve the monitoring accuracy, and then improve the accuracy nature of state information that opens and shuts.
In a specific embodiment of the present application, the low-side current monitoring module may be a low-side current monitoring circuit, and specifically, the low-side current monitoring circuit includes a low-side monitoring resistor 5, where the low-side monitoring resistor 5 is connected in parallel with the negative electrode of the booster valve coil 3; one end of the low-side monitoring resistor 5 is connected with the negative electrode of the booster valve coil 3, the other end of the low-side monitoring resistor 5 is respectively connected with a power ground end and a state information output module, and the potential of the power ground end is 0; the voltage of the low-side monitoring resistor 5 is monitored, so that the voltage value of the negative electrode end of the booster valve is monitored; the voltage value of the negative electrode end of the booster valve is monitored by setting a simple resistor structure, so that the manufacturing cost of the vehicle braking system is reduced.
In the specific embodiment of the application, the low-side current monitoring circuit further comprises a low-side voltage dividing resistor 6, the low-side voltage dividing resistor 6 is connected with the booster valve coil 3 in series, specifically, one end of the low-side voltage dividing resistor 6 is connected with the negative electrode of the booster valve coil 3, and the other end of the low-side voltage dividing resistor 6 is respectively connected with the low-side monitoring resistor 5 and the state information output module; by arranging the low-side voltage dividing resistor 6, the voltage of the low-side monitoring resistor 5 is further reduced, so that the monitoring accuracy is improved, and the accuracy of opening and closing state information is further improved.
In the specific embodiment of the application, the high-side monitoring resistor 2, the high-side voltage dividing resistor 4, the low-side monitoring resistor 5 and the low-side voltage dividing resistor 6 are all 100-800 kΩ; the circuit power consumption of the booster valve state detection module is reduced by setting the high-side monitoring resistor 2, the high-side voltage dividing resistor 4, the low-side monitoring resistor 5 and the low-side voltage dividing resistor 6 to be 100-800 kΩ.
In a specific embodiment of the present application, the state information output module includes a voltage comparison module and a state output module, where the voltage comparison module is used to compare the first voltage with a first preset voltage and compare the second voltage with a second preset voltage; the state output module is used for outputting switching state information based on the comparison result of the voltage comparison module.
In a specific embodiment of the present application, when the first voltage is greater than or equal to a first preset voltage and the second voltage is less than or equal to a second preset voltage, open-close state information indicating that the pressure increasing valve is in a closed state is output; and the device is used for outputting opening and closing information representing that the booster valve is in an opening state under the condition that the first voltage is smaller than a first preset voltage or the second voltage is larger than a second preset voltage.
In the embodiment of the present application, the state information output module may be a combined circuit of the state information not gate 7 and the state information and gate 8, the voltage comparison module may be the state information not gate 7 and a circuit close to the input end of the state information and gate 8, and the state output module may be a circuit close to the output end of the state information and gate 8; specifically, the input end of the state information NOT gate 7 is connected with one end of the low-side monitoring resistor 5, the input end of the state information AND gate 8 is respectively connected with one end of the high-side monitoring resistor 2 and the output end of the state information NOT gate 7, and the output end of the AND gate is connected with the pressure reducing valve scheduling module.
In the embodiment of the present application, in the case that the first voltage is greater than or equal to the first preset voltage, one of the status information and gate circuits 8 is inputted with a high level (logic 1); when the second voltage is less than or equal to the second preset voltage, the input end of the state information not gate 7 is at a low level (logic 0), the output end of the state information not gate 7 is at a high level (logic 1), that is, the other input of the state information not gate 8 is at a high level (logic 1); in the case where the input terminals of the status information and gate 8 are both high (logic 1), the output terminal of the status information and gate 8 is high (logic 1); i.e. the boost valve state detection module has its output high (logic 1) with the boost valve in a closed state.
In the embodiment of the present application, in the case that the first voltage is smaller than the first preset voltage, one of the inputs of the status information and gate 8 is at a low level (logic 0); when the second voltage is greater than the second preset voltage, the input end of the state information not gate 7 is at a high level (logic 1), the output end of the state information not gate 7 is at a low level (logic 0), that is, the other input end of the state information not gate 8 is at a low level (logic 0); in the case where the output terminal in the state information and gate circuit 8 has a low level, the output terminal of the state information and gate circuit 8 is low level (logic 0); that is, the output end of the boost valve state detection module is at a low level (logic 0) when the boost valve is in an open state.
In a specific embodiment of the present application, a calculation formula of the first voltage being greater than or equal to the first preset voltage is as follows:
Vh≥Vhiu1(1+R1/R2) (1)
wherein Vh refers to the first voltage; vhiu1 is the identification voltage of one of the input terminals of the AND gate circuit; r1 is the resistance value of the high-side monitoring resistor 2; r2 is the resistance value of the high-side voltage dividing resistor 4.
In a specific embodiment of the present application, a calculation formula of the second voltage being less than or equal to the second preset voltage is as follows:
Vl≤Vliu2(1+R3/R4) (2)
Wherein Vl is the second voltage; vliu2 is the identification voltage at the input of the NOT circuit; r3 is the resistance value of the low-side monitoring resistor 5; r4 is the resistance value of the low-side voltage dividing resistor 6.
In the specific embodiment of the application, vhiu is 2V-3V; vliu2 is 1V-2V; specifically, vhiu may be 2.7V and vliu2 may be 1.4V.
In the specific embodiment of the application, the high-side current monitoring module is set to be a high-side current monitoring circuit, and the state information output module is set to be a NOT gate circuit and an AND gate circuit, so that the valve state is monitored by simple circuit elements, and the manufacturing cost of the vehicle braking system is reduced.
In other embodiments of the present application, the status information output module may be other logic gates or a combination of other logic gates; it should be noted that the logic gate of the status information output module should correspond to the logic gate of the pressure reducing valve scheduling module.
In the specific embodiment of the application, the voltage ratio of the high-side monitoring resistor 2 to the high-side voltage dividing resistor 4 and the first preset voltage can be adjusted according to the voltage value required by the opening of the booster valve; the voltage ratio of the low-side monitoring resistor 5 to the low-side voltage dividing resistor 6 and the second preset voltage can be adjusted according to the voltage value required by the opening of the booster valve; the voltage ratio of the high-side monitoring resistor 2 to the high-side voltage dividing resistor 4, the voltage ratio of the first preset voltage, the voltage ratio of the low-side monitoring resistor 5 to the low-side voltage dividing resistor 6 and the second preset voltage are adjusted based on the starting voltage value of the booster valve, so that the adaptability of the vehicle braking system is improved.
In the embodiment of the application, the high-side current monitoring module comprises a first filtering module, wherein the first filtering module is used for reducing voltage fluctuation of a first voltage; the low-side current monitoring module comprises a second filtering module, and the second filtering module is used for reducing voltage fluctuation of the second voltage.
In the embodiment of the application, the voltage fluctuation of the first voltage and the second voltage is reduced by arranging the first filtering module and the second filtering module, so that the voltage monitoring accuracy of the high-side current monitoring module and the low-side current monitoring module is improved; the first voltage and the second voltage are accurately obtained, so that the reliability of opening and closing state information is improved, and the reliability of a vehicle braking system is further improved.
Referring to fig. 3, in an embodiment of the present application, the first filter module may be a first filter capacitor 9, where the first filter capacitor 9 is connected in parallel with the high-side monitor resistor 2; the second filter module may be a second filter capacitor 10, where the second filter capacitor 10 is connected in parallel with the low-side monitoring resistor 5; by arranging the first filter module as the first filter capacitor 9 and the second filter module as the second filter capacitor 10, the filter function is realized by a simple capacitor structure, and the manufacturing cost of the vehicle brake system is reduced.
In the embodiment of the application, the vehicle braking system further comprises a first quick shut-off module and a second quick shut-off module, wherein the input end of the first quick shut-off module is connected with the output end of the braking controller, and the output end of the first quick shut-off module is connected with the input end of the booster valve driving module; the input end of the second quick shut-off module is connected with the output end of the pressure reducing valve scheduling module, and the output end of the second quick shut-off module is connected with the input end of the pressure reducing valve driving module.
The first quick turn-off module is used for determining a time node for sending the first braking instruction to the booster valve driving module based on the instruction type of the first braking instruction; the command type of the first brake command comprises a first type and a second type, wherein the first type is used for representing the opening of the control pressure increasing valve, and the second type is used for representing the closing of the control pressure increasing valve; determining the time node to send the first braking instruction to the boost valve driving module may be, in the case of the first type, delaying the time to send the first braking instruction to the boost valve driving module by a first preset delay time, for example, 3 seconds, 4 seconds, or 5 seconds; the time node for determining to send the first braking command to the boost valve driving module may also be to send the first braking command to the boost valve driving module immediately in the case of the second type.
The second quick shut-off module is used for determining a time node for sending the pressure reducing valve working instruction to the pressure reducing valve driving module based on the instruction type of the pressure reducing valve working instruction; the types of the second braking command comprise a third type and a fourth type, wherein the third type is used for representing the opening of the control pressure reducing valve, and the fourth type is used for representing the closing of the control pressure reducing valve; determining the time node at which the pressure reducing valve operating command is sent to the pressure reducing valve driving module may be, in the case of the third type, a time delay of sending the pressure reducing valve operating command to the pressure reducing valve driving module by a second preset delay time, for example, may be 3 seconds, 4 seconds, or 5 seconds; the time node at which the pressure reducing valve operation command is determined to be sent to the pressure reducing valve driving module may be a time point at which the pressure reducing valve operation command is immediately sent to the pressure reducing valve driving module in the case of the fourth type.
In the embodiment of the application, the time nodes of the first braking instruction and the pressure reducing valve working instruction are determined by arranging the first quick shut-off module and the second quick shut-off module, so that the time difference between the first braking instruction and the pressure reducing valve working instruction can be realized, and the pressure increasing valve and the pressure reducing valve can be prevented from being opened simultaneously by utilizing the time difference, thereby improving the braking safety.
In the embodiment of the application, the first quick shutdown module comprises a first cache module, and the second quick shutdown module comprises a second cache module; one end of the first buffer module is connected with the output end of the brake controller, the other end of the first buffer module is connected with the power ground end, and the power ground end refers to a place with potential of 0; one end of the second buffer module is connected with the output end of the pressure reducing valve scheduling module, and the other end of the second buffer module is connected with the power ground end.
The first buffer module is used for deferring a time node for sending a first control instruction to the booster valve driving module under the condition that the first brake instruction characterizes to control the booster valve to be opened; that is, the first buffer module is used for delaying the opening of the pressure increasing valve; specifically, after a first buffer module receives a first braking instruction representing the control of the opening of the pressure increasing valve, the first buffer module delays a first preset delay time and then sends the first braking instruction to the pressure increasing valve driving module; specifically, the first preset delay time may be 3 seconds, 4 seconds, or 5 seconds.
The second buffer module is used for deferring a time node for sending the pressure reducing valve working instruction to the pressure reducing valve driving module under the condition that the pressure reducing valve working instruction characterizes and controls the pressure reducing valve to be opened; that is, the second buffer module is used for delaying the opening of the pressure reducing valve; specifically, after the second buffer module receives a pressure reducing valve working instruction for controlling the opening of the pressure reducing valve, the second buffer module delays a second preset delay time and then sends the pressure reducing valve working instruction to the pressure reducing valve driving module; specifically, the second preset delay time may be 3 seconds, 4 seconds, or 5 seconds.
In the embodiment of the application, the opening of the pressure increasing valve and the pressure reducing valve is delayed by arranging the first buffer module and the second buffer module, so that the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, and the braking safety is further improved.
In the embodiment of the application, the first quick turn-off module further comprises a first strengthening module, and the second quick turn-off module further comprises a second strengthening module; the first strengthening module is arranged between the brake controller and the first cache module; the second strengthening module is arranged between the pressure reducing valve scheduling module and the second buffer module.
The first strengthening module is used for changing the time node for deferring to send the first control command to the booster valve driving module under the condition that the first brake command characterizes to control the booster valve to be opened; specifically, after the first buffer module receives a first braking instruction for controlling the opening of the pressure increasing valve, the delayed first preset delay time can be changed into a first strengthening time; specifically, the first preset delay time may be 3 seconds, 4 seconds or 5 seconds, and the first strengthening time may be 7 seconds or 2 seconds; i.e. the first preset delay time may be longer or shorter.
The second strengthening module is used for changing the time node for deferring sending the pressure reducing valve working instruction to the pressure reducing valve driving module under the condition that the pressure reducing valve working instruction characterizes and controls the pressure reducing valve to be opened; namely, changing the time for delaying the opening of the pressure reducing valve; specifically, after the second buffer module receives a pressure reducing valve working instruction for controlling the opening of the pressure reducing valve, the delayed second preset delay time can be changed into a second strengthening time; specifically, the first preset delay time may be 3 seconds, 4 seconds or 5 seconds, and the second strengthening time may be 7 seconds or 2 seconds; i.e. the second preset delay time may be longer or shorter.
In the embodiment of the application, by arranging the first strengthening module and the second strengthening module and changing the time for delaying the opening of the pressure increasing valve or the pressure reducing valve, the operability for preventing the pressure increasing valve and the pressure reducing valve from being simultaneously opened is improved, and the adaptability of the vehicle braking system is further improved.
Referring to fig. 4 to 5, in a specific embodiment of the present application, both the first buffer module and the second buffer module may be storage capacitors; specifically, the first buffer module is a first storage capacitor 11, and the second buffer module is a second storage capacitor 12; through setting up simple electric capacity structure, realize opening the delay of pressure boost valve and relief pressure valve, when improving vehicle braking system security, reduced vehicle braking system's manufacturing cost.
Referring to fig. 4-5, in an embodiment of the present application, both the first strengthening module and the second strengthening module may be resistor circuits; the resistor circuit comprises a strengthening resistor and a strengthening diode, and the strengthening resistor and the strengthening diode are connected in parallel; specifically, the first strengthening module includes a first strengthening resistor 13 and a first strengthening diode 14, and the second strengthening module includes a second strengthening resistor 15 and a second strengthening diode 16; the conducting direction of the first reinforcing diode 14 is the direction from the brake controller to the booster valve driving module; the second diode 16 is turned on in the direction from the pressure reducing valve scheduling module to the pressure reducing valve driving module.
In a specific embodiment of the application, the first buffer module is connected in parallel with the pressure increasing valve driving module, and the second buffer module is connected in parallel with the pressure reducing valve driving module.
In a specific embodiment of the present application, the specific working principle of the first quick shutdown module is as follows: under the condition that the first braking instruction characterizes to control the opening of the pressure increasing valve, the electric signal is discharged from high to low, the voltage at two ends of the first electric storage capacitor 11 is slowly reduced along the first strengthening resistor 13, the input voltage of the pressure increasing valve driving module connected with the first buffer module in parallel is reduced along with the first electric storage capacitor 11, and under the condition that the voltage of the pressure increasing valve driving module is reduced to a preset value, the preset value can be specifically 0, and the pressure increasing valve driving module loses electricity to control the opening of the pressure increasing valve; under the condition that the first braking instruction characterizes to control the closing of the pressure increasing valve, the electric signal is from low to high, the first storage capacitor 11 stores electricity rapidly along the first strengthening diode 14, so that the pressure increasing valve driving module rapidly gets electricity to control the pressure increasing valve to be closed, and the time for controlling the pressure increasing valve to be closed is about 0.
In a specific embodiment of the present application, the specific working principle of the second fast turn-off module is as follows: under the condition that the working instruction of the pressure reducing valve characterizes and controls the opening of the pressure reducing valve, the electric signal is stored from low to high, the second storage capacitor 12 stores electricity along the second strengthening resistor 15, the voltage at two ends of the second storage capacitor 12 slowly rises, the input voltage of the pressure reducing valve driving module connected in parallel with the second buffer module rises along with the rising of the voltage of the pressure reducing valve driving module, and under the condition that the voltage rising value of the pressure reducing valve driving module is preset, the pressure reducing valve driving module loses electricity to control the opening of the pressure reducing valve; in the case where the pressure reducing valve operation instruction characterizes the control of the pressure reducing valve closing, the electrical signal is rapidly discharged from high to low along the second strengthening diode 16 by the second storage capacitor 12, so that the pressure reducing valve driving module is rapidly powered off to control the pressure reducing valve to be closed, and the time for controlling the pressure reducing valve to be closed is about 0.
In a specific embodiment of the present application, a calculation formula of a time node for deferring sending a first control command to the pressure increasing valve driving module and a time node for deferring sending a pressure reducing valve working command to the pressure increasing valve driving module is as follows:
Tc＝C*R (3)
Wherein Tc refers to a deferred time node; c is the capacitance value of the storage capacitor; r is the resistance value of the strengthening resistor.
In the specific embodiment of the application, the quick turn-off module is arranged by the storage capacitor, the strengthening resistor and the strengthening diode, so that the simultaneous opening of the pressure increasing valve and the pressure reducing valve is avoided, the braking safety is improved, and the manufacturing cost of the vehicle braking system is reduced.
In the specific embodiment of the application, the electric storage capacitor and the strengthening resistor can also form a first-order low-pass filter, so that the anti-shake filter function is realized, and the control accuracy of a vehicle braking system is further improved; specifically, the cut-off frequency of the first-order low-pass filter is:
fc＝1/2π*C*R (4)
Where fc refers to the cut-off frequency; c is the capacitance value of the storage capacitor; r is the resistance value of the strengthening resistor.
In the embodiment of the application, the vehicle braking system further comprises an information transmission module, wherein the information transmission module is used for determining a time node for sending the opening and closing state information to the pressure reducing valve scheduling module based on the state type of the opening and closing state information; the information transmission module is arranged between the pressure increasing valve state detection module and the pressure reducing valve scheduling module; the state types of the opening and closing state information comprise a first state type and a second state type, wherein the first state type represents that the pressure increasing valve is in an opening state, and the second state type represents that the pressure increasing valve is in a closing state; the determining the time node for sending the opening and closing state information to the pressure reducing valve scheduling module may be sending the opening and closing state information to the pressure reducing valve driving module immediately under the condition of the first state type; the time node for determining the sending of the opening and closing state information to the pressure reducing valve scheduling module may also be a third preset delay time of the time delay of sending the opening and closing state information to the pressure reducing valve driving module in the case of the second state type, for example, may be delayed by 3 seconds, 4 seconds or 5 seconds.
In the embodiment of the application, the time node for sending the opening and closing state information is determined by arranging the information transmission module, so that the simultaneous opening of the pressure increasing valve and the pressure reducing valve is avoided, and the braking safety is improved.
In the embodiment of the application, the information transmission module comprises a third buffer module, wherein the third buffer module is used for deferring a time node for sending the opening and closing state information to the pressure reducing valve scheduling module under the condition that the opening and closing state information represents that the pressure increasing valve is in a closed state; namely, the state information transmission of the pressurizing valve in a closed state is delayed; specifically, after receiving the opening and closing state information indicating that the pressure increasing valve is in a closed state, the third buffer module delays a third preset delay time and then sends the opening and closing state information to the pressure reducing valve scheduling module; specifically, the third preset delay time may be 3 seconds, 4 seconds, or 5 seconds.
In the embodiment of the application, based on the basic characteristics of the valve, the closing of the pressure increasing valve is in one process, and the opening and closing state information representing the closing state of the pressure increasing valve sent to the pressure reducing valve scheduling module is delayed by arranging the information transmission module, so that the pressure increasing valve can be completely closed, the simultaneous opening of the pressure increasing valve and the pressure reducing valve is avoided, and the safety of a vehicle braking system is further improved.
In the embodiment of the application, the information transmission module further comprises a third strengthening module, and the third strengthening module is used for changing the time node for deferring sending the opening and closing state information instruction to the pressure reducing valve scheduling module under the condition that the opening and closing state information represents that the pressure reducing valve is in a closed state; specifically, after the third buffer module receives a pressure reducing valve working instruction for controlling the pressure reducing valve to be opened, the delayed third preset delay time can be changed into third strengthening time; specifically, the third preset delay time may be 3 seconds, 4 seconds or 5 seconds, and the third strengthening time may be 7 seconds or 2 seconds; i.e. the first preset delay time may be longer or shorter.
In the embodiment of the application, the third strengthening module is arranged, so that the information transmission module can change the time node for deferring sending the opening and closing state information instruction to the pressure reducing valve scheduling module based on the self parameter characteristics of the pressure increasing valve, and the applicability of the vehicle braking system is improved.
In some embodiments of the present application, the information transfer module may be identical to the structures of the first quick-turn-off module and the second quick-turn-off module; i.e. the information transfer module comprises a circuit of a first order low pass filter and a diode.
Referring to fig. 6, in an embodiment of the present application, the information transfer module may be a combined circuit of a second-order low-pass filter and a diode, that is, the information transfer module includes two storage capacitors, two strengthening resistors, and one strengthening diode; specifically, the information transfer module includes a third electric storage capacitor 17, a fourth electric storage capacitor 18, a third strengthening resistor 19, a fourth strengthening resistor 20, and a third strengthening diode 21; after the first-order low-pass filters respectively formed by the third electric storage capacitor 17, the third strengthening resistor 19, the fourth electric storage capacitor 18 and the fourth strengthening resistor 20 are connected in series and arranged between the pressure increasing valve state detection module and the pressure reducing valve scheduling module, the third strengthening diode 21 is connected in parallel with the strengthening resistor close to the pressure reducing valve scheduling module, one end of the third strengthening diode 21 close to the pressure increasing valve state detection module is connected with a power ground terminal, and the conducting direction of the third strengthening diode 21 is the direction from the pressure reducing valve scheduling module to the pressure increasing valve state detection module; preferably, a protection resistor 22 can be further arranged between the third strengthening diode 21 and the power ground terminal, so that the reliability of the information transmission module is improved; the information transmission module is formed by arranging the combined circuit of the second-order low-pass filter and the diode, so that the manufacturing cost of a vehicle manufacturing system is reduced, and the accuracy of information transmission of the opening and closing state is improved.
In a specific embodiment of the present application, the specific working principle of the information transfer module is as follows: under the condition that the opening and closing state information indicates that the booster valve is in a closed state, a signal transmitted by the booster valve state detection module is from low to high, and the third power storage capacitor 17 and the fourth power storage capacitor 18 respectively perform slow power storage through a third strengthening resistor 19 and a fourth strengthening resistor 20 which are respectively corresponding to each other, so that a transmission time node of the opening and closing state information is further delayed; under the condition that the opening and closing state information represents that the pressure increasing valve is in an opening state, signals transmitted by the pressure increasing valve state detection module are from high to low, the third electric storage capacitor 17 close to the pressure reducing valve scheduling module is rapidly discharged through the third strengthening diode 21 and the protection resistor 22, the fourth electric storage capacitor 18 far away from the pressure reducing valve scheduling module is rapidly discharged through the protection resistor 22, and further the transmission time node of the opening and closing state information is not affected.
In the specific embodiment of the application, under the condition that the opening and closing state information indicates that the pressure increasing valve is in a closed state, the transmission of the opening and closing state information is delayed, so that the pressure increasing valve can be completely closed, the pressure increasing valve and the pressure reducing valve are prevented from being simultaneously opened, and the safety of a vehicle braking system is further improved; under the condition that the opening and closing state information characterizes the pressure increasing valve to be in an opening state, the transmission of the opening and closing state information is not influenced, so that the pressure reducing valve scheduling module can quickly generate a pressure reducing valve working instruction based on the opening and closing state information of the pressure increasing valve, the pressure increasing valve and the pressure reducing valve are prevented from being opened at the same time, and the safety of a vehicle braking system is further improved.
In other embodiments of the present application, the information transfer module may be a third-order low-pass filter or a combination circuit of a higher-order low-pass filter and a diode, and the specific arrangement and the working principle are not described in detail herein; the working principle of the information transmission module needs to be matched with the pressure increasing valve state detection module and the pressure reducing valve scheduling module.
In an embodiment of the application, the vehicle braking system further comprises a first overcurrent protection module and a second overcurrent protection module; one end of the first overcurrent protection module is connected with the booster valve, and the other end of the first overcurrent protection module is respectively connected with the brake controller and the booster valve driving module; one end of the second overcurrent protection module is connected with the pressure reducing valve, and the other end of the second overcurrent protection module is connected with the brake controller and the pressure increasing valve driving module respectively.
The first overcurrent protection module is used for monitoring the current flowing through the booster valve and controlling the working state of the booster valve driving module based on the current in the booster valve.
The second overcurrent protection module is used for monitoring the current flowing through the pressure reducing valve and controlling the working state of the pressure increasing valve driving module based on the current in the pressure reducing valve.
In an embodiment of the present application, the first overcurrent protection module includes a first protection driving module, and the second overcurrent protection module includes a second protection driving module.
The first protection driving module is used for controlling the booster valve driving module to stop working under the condition that the current in the booster valve exceeds a first preset current threshold value.
The second protection driving module is used for controlling the pressure reducing valve driving module to stop working under the condition that the current in the pressure reducing valve exceeds a second preset current threshold value.
In the embodiment of the application, the first protection driving module and the second protection driving module are arranged, so that the pressure increasing valve or the pressure reducing valve is controlled to stop working under the condition that the pressure increasing valve and the pressure reducing valve overflow, the safety of the vehicle braking system is ensured, and the reliability of the vehicle braking system is improved.
In an embodiment of the present application, the first overcurrent protection module includes a first feedback module, and the second overcurrent protection module includes a second feedback module.
The first feedback module is used for feeding back the overcurrent information of the booster valve to the brake controller under the condition that the current in the booster valve exceeds a first preset current threshold value;
The second feedback module is used for feeding back the overcurrent information of the pressure reducing valve to the brake controller under the condition that the current in the pressure reducing valve exceeds a second preset current threshold value.
In the embodiment of the application, by arranging the first feedback module and the second feedback module, the brake controller can know the condition that the pressure increasing valve and the pressure reducing valve are over-current so as to implement corresponding safety measures.
In the specific embodiment of the application, under the condition that the pressure increasing valve and the pressure reducing valve are positioned at the lower end of the driving module, the driving mode of the pressure increasing valve and the pressure reducing valve is PMOS/PNP driving, namely high-side driving; in the case where the pressure increasing valve and the pressure reducing valve are at the upper end of the driving module, the pressure increasing valve and the pressure reducing valve are driven in an NMOS/NPN driving manner, i.e., a low side driving manner.
In a specific embodiment of the present application, under the condition of high-side driving, the first overcurrent protection module and the second overcurrent protection module may be high-side current protection circuits or low-side current protection circuits; in the case of low-side driving, the first and second overcurrent protection modules are low-side current protection circuits.
Referring to fig. 7, in the embodiment of the present application, the high-side current protection circuit includes a current sampling resistor 23, a current limiting resistor 24, an overcurrent protection regulator tube 25, and an overcurrent protection driving tube 26; specifically, the over-current protection voltage stabilizer 25 may be a zener diode, and the over-current protection driving tube 26 may be a triode; one end of the current sampling resistor 23 is connected with a pressure increasing valve or a pressure reducing valve, and the other end of the current sampling resistor 23 is connected with a power ground end; the current limiting resistor 24, the overcurrent protection voltage stabilizing tube 25 and the be end of the overcurrent protection driving tube 26 are connected in series and then connected in parallel with the current sampling resistor 23; the positive electrode of the overcurrent protection voltage stabilizing tube 25 is connected with the emitter (e end) of the overcurrent protection driving tube 26, and the negative electrode of the overcurrent protection voltage stabilizing tube 25 is connected with the power ground end; the collector (c-terminal) of the overcurrent protection drive tube 26 is connected to the pressure-increasing valve drive module or the pressure-reducing valve drive module, and the brake controller, respectively.
In a specific embodiment of the present application, the working principle of the high-side current protection circuit is as follows: in the case where the pressure increasing valve or the pressure reducing valve is over-current, the voltage across the current sampling resistor 23 increases; in the case where the voltage across the current sampling resistor 23 increases to the threshold value, the overcurrent protection regulator tube 25 is turned on; the voltage at two ends of the current sampling resistor 23 can pass through the current limiting resistor 24 and the overcurrent protection voltage stabilizing tube 25 so as to lead the overcurrent protection driving tube 26 to be conducted; the signals transmitted to the pressure increasing valve driving module and the pressure reducing valve driving module are controlled to stop working from high to low; specifically, the drive of the pressure increasing valve driving module or the pressure reducing valve driving module is limited by reducing the pressure drop at the ce end of the overcurrent protection driving pipe 26, so that the pressure increasing valve driving module and the pressure reducing valve driving module are closed; and simultaneously feeding back a signal representing the overcurrent of the pressure increasing valve or the overcurrent of the pressure reducing valve to the brake controller so as to implement corresponding safety measures.
In a specific embodiment of the present application, the calculation formula of the overcurrent protection value of the high-side current protection circuit is as follows:
Imax＝(Vd+VQbe+Id*R1)/R2 (4)
Wherein Imax refers to a first preset current threshold or a second preset current threshold; vd means the regulated voltage of the overcurrent protection regulator 25; VQbe refers to the pressure drop across the be end of the flow protection drive tube 26; id is the on current of the overcurrent protection regulator tube 25; r1 is the resistance of the current limiting resistor 24; r2 is the resistance value of the current sampling resistor 23.
In the embodiment of the present application, the voltage drop at the be end of the overcurrent protection driving tube 26 is 0.7V, and the on current of the overcurrent protection voltage stabilizing tube 25 is 1mA.
Referring to fig. 8, in a specific embodiment of the present application, the low-side current protection circuit includes a current sampling resistor 23, a current limiting resistor 24, a bias resistor 27, an overcurrent protection regulator tube 25, and two overcurrent protection driving tubes 26; specifically, the over-current protection voltage stabilizer 25 may be a zener diode, and the over-current protection driving tube 26 may be a triode; one end of the current sampling resistor 23 is connected with a power end, and the other end is connected with a pressure increasing valve or a pressure reducing valve; the two overcurrent protection driving pipes 26, the current limiting resistor 24 and the bias resistor 27 form a protection driving circuit and are connected in series with the overcurrent protection voltage stabilizing pipe 25; the protection drive circuit is connected in series with the overcurrent protection surge tank 25 and then connected in parallel with the current sampling resistor 23.
In the specific embodiment of the present application, the protection driving circuit includes a first overcurrent protection driving tube 261 and a second overcurrent protection driving tube 262, wherein, an emitter (e end) of the first overcurrent protection driving tube 261 is connected with a cathode of the overcurrent protection voltage stabilizing tube 25, a base (b end) of the first overcurrent protection driving tube 261 is connected with a pressure increasing valve or a pressure reducing valve, and a collector (c end) of the first overcurrent protection driving tube 261 is connected with one end of the current limiting resistor 24; the other end of the current limiting resistor 24 is connected with the base (b end) of the second overcurrent protection driving tube 262 and one end of the bias resistor 27 respectively, and the other end of the bias resistor 27 is connected with the power ground; the emitter (e end) of the second overcurrent protection tube is connected with the power supply ground end, and the collector (c end) of the second overcurrent protection tube is respectively connected with the pressure increasing valve driving module or the pressure reducing valve driving module and the brake controller.
In a specific embodiment of the present application, the working principle of the low-side current protection circuit is as follows: in the case where the pressure increasing valve or the pressure reducing valve is over-current, the voltage across the current sampling resistor 23 increases; in the case where the voltage across the current sampling resistor 23 increases to the threshold value, the first overcurrent protection regulator tube 25 is turned on; after the first overcurrent protection voltage stabilizing tube 25 is conducted, the voltage of the pressure boosting valve driving module or the pressure reducing valve driving module is limited by the voltage of the second overcurrent protection voltage stabilizing tube 25 through the current limiting of the current limiting resistor 24 and the voltage division of the bias resistor 27, so that the pressure boosting valve driving module or the pressure reducing valve driving module stops working.
In a specific embodiment of the present application, the calculation formula of the overcurrent protection value of the low-side current protection circuit is as follows:
Imax＝Vd/R (4)
wherein Imax refers to a first preset current threshold or a second preset current threshold; vd means the regulated voltage of the overcurrent protection regulator 25; r refers to the resistance value of the current sampling resistor 23.
In a specific embodiment of the present application, the first preset current threshold value or the second preset current threshold value may be determined only based on the regulated voltage of the overcurrent protection regulator tube 25, so as to improve the applicability of the first overcurrent protection module and the second overcurrent protection module.
In the specific embodiment of the application, the over-current protection of the pressure increasing valve and the pressure reducing valve is realized by adopting the simple structures of the resistor, the zener diode and the triode, so that the manufacturing cost of the vehicle braking system is reduced; excessive signal transmission is not needed, so that the overcurrent reaction speed is improved, and the safety of a vehicle braking system is improved.
Referring to fig. 9, the following describes a specific operation principle of the vehicle manufacturing system according to the embodiment of the present application:
The pressure increasing valve is in a normally open state, and the pressure reducing valve is in a normally closed state.
In the case where the vehicle needs to be supercharged, the supercharging valve and the decompression valve do not need to be changed to directly supercharge.
Under the condition that the vehicle needs to be depressurized, the pressure increasing valve needs to be closed, and the pressure reducing valve needs to be opened; at the moment, the first braking instruction characterizes the control pressure increasing valve to be closed, and the second braking instruction characterizes the control pressure reducing valve to be opened; the first braking instruction rapidly passes through the shut-off module and then reaches the booster valve driving module, and the booster valve driving module controls the booster valve to be closed based on the first braking instruction; the pressure boosting valve state detection module detects that the pressure boosting valve is in a closed state and sends open-close state information representing that the pressure boosting valve is in the closed state; the opening and closing state information representing that the pressure increasing valve is in a closed state delays a transmission time node of the opening and closing state information through the information transmission module, and after the opening and closing state information is transmitted to the pressure reducing valve scheduling module in a delayed mode, the pressure reducing valve scheduling module generates a pressure reducing valve working instruction based on the opening and closing state information and the second braking instruction, and the pressure reducing valve working instruction represents and controls the opening of the pressure reducing valve; under the condition that the opening and closing state information representing that the pressure increasing valve is in the closed state is not transmitted to the pressure reducing valve scheduling module, the pressure reducing valve working instruction generated by the pressure reducing valve scheduling module represents that the pressure reducing valve is controlled (kept) to be closed; and after the pressure reducing valve working instruction is transmitted through the delay of the second quick shut-off module, the pressure reducing valve working instruction is transmitted to the pressure reducing valve driving module, and the pressure reducing valve driving module controls the pressure reducing valve to be closed based on the pressure reducing valve working instruction.
Under the condition that the vehicle needs to be restored to a normal state from a pressure release state, the pressure increasing valve needs to be opened, and the pressure reducing valve needs to be closed; at the moment, the first braking instruction characterizes the opening of the control pressure increasing valve, and the second braking instruction characterizes the closing of the control pressure reducing valve; the first braking instruction is transmitted to the booster valve driving module after being transmitted by the delay of the first quick shut-off module; meanwhile, the second braking instruction quickly reaches the pressure reducing valve scheduling module, the pressure reducing valve scheduling module generates a pressure reducing valve working instruction, and the pressure reducing valve working instruction characterizes and controls the pressure reducing valve to be closed; the pressure reducing valve working instruction is quickly transmitted to the pressure reducing valve driving module, and the pressure reducing valve driving module controls the closing of the pressure reducing valve based on the pressure reducing valve working instruction; after the first braking instruction is transmitted to the booster valve driving module through the first quick shut-off module, the booster valve driving module controls the opening of the booster valve based on the first braking instruction.
Under the condition that the pressure increasing valve is in overcurrent, the first overcurrent protection module monitors the overcurrent of the pressure increasing valve, controls the pressure increasing valve driving module to stop working, and feeds back an overcurrent signal of the pressure increasing valve to the brake controller; under the condition that the pressure reducing valve is over-current, the second over-current protection module monitors the pressure reducing valve to be over-current, controls the pressure reducing valve driving module to stop working, and feeds back a pressure reducing valve over-current signal to the brake controller.
In the embodiment of the application, the vehicle braking system has the following beneficial effects:
1) By arranging the pressure increasing valve state detection module and the pressure reducing valve scheduling module, a pressure reducing valve working instruction is generated based on opening and closing information of the pressure increasing valve and a second braking instruction sent by the braking controller, so that the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, safety interlocking is realized, and braking safety is improved; the pressure increasing valve and the pressure reducing valve are prevented from being opened simultaneously, and meanwhile, the opening and closing state information of the pressure increasing valve is not required to be transmitted back to the brake controller, so that the brake efficiency is improved, and the brake safety is improved.
2) By employing simple electrical structural elements, the functions of each module are realized, thereby reducing the manufacturing cost of the vehicle brake system.
3) By adopting the electrical structural elements to carry out signal transmission and signal interlocking, delay in the processing process of the processor is avoided, and further, the braking efficiency is improved.
4) Under the condition that the pressure increasing valve or the pressure reducing valve overflows, the operation of the pressure increasing valve driving device or the pressure reducing valve driving device can be automatically stopped, so that a braking system is protected, and the safety of the braking system is improved.
5) Through setting up first quick shutoff module, second quick shutoff module and information transfer module, further avoid opening when pressure boost valve and relief pressure valve, and then improve braking security.
The foregoing description has fully disclosed specific embodiments of this application. It should be noted that any modifications to the specific embodiments of the application may be made by those skilled in the art without departing from the scope of the application as defined in the appended claims. Accordingly, the scope of the claims of the present application is not limited to the foregoing detailed description.

Claims (13)

1. A vehicle braking system is characterized by comprising a braking controller, a pressure increasing valve, a pressure reducing valve, a pressure increasing valve driving module, a pressure increasing valve state detecting module and a pressure reducing valve scheduling module,
The brake controller is used for sending a first brake instruction to the pressure increasing valve driving module and sending a second brake instruction to the pressure reducing valve scheduling module;
the booster valve driving module is used for controlling the opening and closing of the booster valve based on the first braking instruction;
The pressure increasing valve state detection module is used for detecting opening and closing state information of the pressure increasing valve and transmitting the opening and closing state information to the pressure reducing valve scheduling module;
The pressure reducing valve scheduling module is used for generating a pressure reducing valve working instruction based on the second braking instruction and the opening and closing state information; the pressure reducing valve working order enables the pressure increasing valve and the pressure reducing valve not to be opened at the same time.
2. The vehicle braking system according to claim 1, wherein the pressure reducing valve scheduling module includes an information fusion module, and the information fusion module is configured to fuse the opening and closing state information and the second braking instruction to obtain a fusion result; and generating the pressure reducing valve working instruction based on the fusion result.
3. The vehicle braking system according to claim 2, wherein the information fusion module includes an information judgment module and an instruction generation module;
the information judging module is used for judging whether the opening and closing state information is matched with the second braking instruction or not;
The instruction generation module is used for determining the second braking instruction as the pressure reducing valve working instruction under the condition that the opening and closing state information is matched with the second braking instruction, and determining the pressure reducing valve working instruction as the pressure reducing valve closing instruction under the condition that the opening and closing state information is not matched with the second braking instruction.
4. A vehicle braking system according to claim 3 wherein the information judgment module comprises a first judgment module, a second judgment module and a third judgment module;
The first judging module is used for judging that the opening and closing state information is matched with the second braking instruction under the condition that the opening and closing state information represents that the pressure increasing valve is closed and the second braking instruction represents that the pressure reducing valve is controlled to be opened;
the second judging module is used for judging that the opening and closing state information is matched with the second braking instruction under the condition that the second braking instruction characterizes and controls the pressure reducing valve to be closed;
The third judging module is used for judging that the opening and closing state information is not matched with the second braking instruction under the condition that the opening and closing state information characterizes that the pressure increasing valve is opened and the second braking instruction characterizes that the pressure reducing valve is controlled to be opened.
5. The vehicle braking system of claim 1, wherein the boost valve status detection module comprises a high side current monitoring module, a low side current monitoring module, and a status information output module;
The high-side current monitoring module is used for monitoring a first voltage of the booster valve close to a power supply end;
The low-side current monitoring module is used for monitoring a second voltage of the booster valve far away from a power supply end;
The state information output module is used for determining the opening and closing state information based on the first voltage and the second voltage, and sending the opening and closing state information to the pressure reducing valve scheduling module.
6. The vehicle braking system of claim 5, wherein the high-side current monitoring module includes a first filtering module for reducing voltage fluctuations of the first voltage;
the low-side current monitoring module comprises a second filtering module, wherein the second filtering module is used for reducing voltage fluctuation of the second voltage.
7. A vehicle braking system according to claim 1, further comprising a first quick shut-off module and a second quick shut-off module,
The first quick turn-off module is used for determining a time node for sending the first braking instruction to the booster valve driving module based on the instruction type of the first braking instruction;
The second quick shut-off module is used for determining a time node for sending the pressure reducing valve working instruction to the pressure reducing valve driving module based on the instruction type of the pressure reducing valve working instruction.
8. The vehicle braking system of claim 7, wherein the first quick shut-off module comprises a first cache module and the second quick shut-off module comprises a second cache module;
the first buffer module is used for deferring a time node for sending the first brake instruction to the pressure increasing valve driving module under the condition that the first brake instruction characterizes and controls the pressure increasing valve to be opened;
The second buffer module is used for deferring a time node for sending the pressure reducing valve working instruction to the pressure reducing valve driving module under the condition that the pressure reducing valve working instruction characterizes and controls the pressure reducing valve to be opened.
9. The vehicle braking system of claim 1, further comprising an information transfer module configured to determine a time node to send the open-close status information to the relief valve scheduling module based on a status type of the open-close status information.
10. The vehicle braking system according to claim 9, wherein the information transfer module includes a third buffer module for deferring a time node for sending the open-close state information to the pressure relief valve scheduling module if the open-close state information characterizes the pressure relief valve in a closed state.
11. A vehicle braking system according to claim 7, further comprising a first and a second over-current protection module,
The first overcurrent protection module is used for monitoring current flowing through the booster valve and controlling the working state of the booster valve driving module based on the current in the booster valve;
The second overcurrent protection module is used for monitoring the current flowing through the pressure reducing valve and controlling the working state of the pressure increasing valve driving module based on the current in the pressure reducing valve.
12. The vehicle braking system of claim 11, wherein the first over-current protection module comprises a first protection drive module and the second over-current protection module comprises a second protection drive module;
The first protection driving module is used for controlling the booster valve driving module to stop working under the condition that the current in the booster valve exceeds a first preset current threshold value;
The second protection driving module is used for controlling the pressure reducing valve driving module to stop working under the condition that the current in the pressure reducing valve exceeds a second preset current threshold value.
13. The vehicle braking system of claim 12, wherein the first over-current protection module comprises a first feedback module and the second over-current protection module comprises a second feedback module;
the first feedback module is used for feeding back the overcurrent information of the booster valve to the brake controller under the condition that the current in the booster valve exceeds the first preset current threshold value;
the second feedback module is used for feeding back the overcurrent information of the pressure reducing valve to the brake controller under the condition that the current in the pressure reducing valve exceeds the second preset current threshold value.
CN202210873383.8A 2022-07-21 2022-07-21 Vehicle braking system Active CN115123162B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104590228A (en) * 2014-09-25 2015-05-06 浙江万向精工有限公司 Pressure adjusting method for auxiliary braking system
CN107618490A (en) * 2017-10-17 2018-01-23 吉林大学 Line traffic control Pneumatic braking system controller and its control method
CN109927696A (en) * 2018-01-18 2019-06-25 万向钱潮股份有限公司 A kind of vehicle electric brake fluid system and braking method
CN110182187A (en) * 2019-05-21 2019-08-30 清华大学 Energy feedback type active brake system and control method with fail safe ability
CN113085816A (en) * 2021-04-14 2021-07-09 中汽创智科技有限公司 Redundant braking system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104590228A (en) * 2014-09-25 2015-05-06 浙江万向精工有限公司 Pressure adjusting method for auxiliary braking system
CN107618490A (en) * 2017-10-17 2018-01-23 吉林大学 Line traffic control Pneumatic braking system controller and its control method
CN109927696A (en) * 2018-01-18 2019-06-25 万向钱潮股份有限公司 A kind of vehicle electric brake fluid system and braking method
CN110182187A (en) * 2019-05-21 2019-08-30 清华大学 Energy feedback type active brake system and control method with fail safe ability
CN113085816A (en) * 2021-04-14 2021-07-09 中汽创智科技有限公司 Redundant braking system

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