CN114954403A - Hydraulic line control system - Google Patents

Hydraulic line control system Download PDF

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Publication number
CN114954403A
CN114954403A CN202210503958.7A CN202210503958A CN114954403A CN 114954403 A CN114954403 A CN 114954403A CN 202210503958 A CN202210503958 A CN 202210503958A CN 114954403 A CN114954403 A CN 114954403A
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CN
China
Prior art keywords
pressure
oil
master cylinder
brake
control
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Granted
Application number
CN202210503958.7A
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Chinese (zh)
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CN114954403B (en
Inventor
郝江脉
袁炳
黄洁丹
于海涛
张红波
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Zhejiang Asia Pacific Mechanical and Electronic Co Ltd
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Zhejiang Asia Pacific Mechanical and Electronic Co Ltd
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Application filed by Zhejiang Asia Pacific Mechanical and Electronic Co Ltd filed Critical Zhejiang Asia Pacific Mechanical and Electronic Co Ltd
Priority to CN202210503958.7A priority Critical patent/CN114954403B/en
Publication of CN114954403A publication Critical patent/CN114954403A/en
Application granted granted Critical
Publication of CN114954403B publication Critical patent/CN114954403B/en
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    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B60T13/148—Arrangements for pressure supply
    • 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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/06—Disposition of pedal
    • 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
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • B60T8/409—Systems with stroke simulating devices for driver input characterised by details of the stroke simulating device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention discloses a hydraulic line control system. The master cylinder control part is used for receiving a target pressure signal generated by the control action of the external brake in real time, transmitting the target pressure signal to the pressure execution part; the brake system comprises a pressure execution part with pressure regulation control, and is used for receiving a target pressure signal from a master cylinder control part in real time, and executing braking through the pressure regulation control. The invention reduces the manufacturing cost of the braking system, avoids the problems of overhigh and fluctuating braking oil pressure and realizes the accurate pressure regulation and the pressure stabilizing regulation of the braking oil pressure.

Description

Hydraulic line control system
Technical Field
The invention belongs to an intelligent driving electronic brake control system of an automobile, and particularly relates to a hydraulic line control system of a brake master cylinder in an automobile electric brake system and a related control method.
Background
Under the vigorous development environment of new energy automobiles, the automobiles are developing from the traditional internal combustion engine power to the direction of hybrid power and pure electric power driving. The automobile without the power of the traditional internal combustion engine does not have a vacuum source to provide vacuum assistance for a brake master cylinder in the braking process, and in order to solve the problem, the existing electric vehicle or hybrid vehicle can be additionally provided with a vacuum pump on the traditional booster to serve as the vacuum source. The method increases the cost on one hand and increases the inevitable working noise of the vacuum pump on the other hand.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a hydraulic line control system which can quickly, efficiently and accurately control the braking force of each wheel cylinder in a temperature manner, can achieve the effect of quickly boosting within a specified time and realizes the function of quickly and accurately controlling the pressure of the wheel cylinder. The high-pressure accumulator is filled with high-pressure brake fluid and then is used for providing brake fluid pressure for the brake system, so that the extremely fast response of the brake system is realized.
The technical scheme of the invention is as follows:
the master cylinder control part is used for receiving a target pressure signal generated by the control action of the external brake in real time, transmitting the target pressure signal to the pressure execution part;
the brake system comprises a pressure execution part with pressure regulation control, and is used for receiving a target pressure signal from a master cylinder control part in real time, and executing braking through the pressure regulation control.
The master cylinder control part is specifically as follows:
the device comprises a liquid storage module, a liquid storage module and a control module, wherein the liquid storage module is used for storing oil;
the brake master cylinder is characterized by comprising a brake master cylinder, wherein a cavity communicated with a liquid storage module is arranged in the cylinder body, and a piston in the cavity is synchronously connected with a pedal;
the device comprises a pedal displacement sensor, a brake system and a control system, wherein the pedal displacement sensor is arranged at a pedal and used for monitoring the moving distance of the pedal in real time and backing up the moving distance as a braking intention signal;
the simulator comprises a simulator pressure sensor, a pressure sensor and a pressure sensor, wherein the simulator pressure sensor is connected to a cavity of a brake master cylinder and is used for monitoring the oil pressure in the cavity in real time and then feeding back and sending the oil pressure to a pressure execution part;
includes a simulator assembly connected to the chamber of the master cylinder for sensing the pressure of the oil in the chamber of the master cylinder and generating a resiliently reactive force acting against the piston and the pedal.
Two chambers which are communicated with the liquid storage module and are sequentially and adjacently arranged are arranged in a cylinder body of the brake master cylinder, wherein one chamber is connected with the pedal through a piston and serves as a first chamber, and the other chamber serves as a second chamber;
the simulator pressure sensor is connected to the first cavity or the second cavity of the brake master cylinder and used for monitoring the oil pressure in the first cavity in real time and then feeding back and sending the oil pressure to the pressure execution part;
the simulator assembly is connected to the first chamber or the second chamber of the master cylinder and is used for sensing oil pressure in the first chamber of the master cylinder and generating elastic feedback force to apply reaction force to the piston and the pedal of the first chamber.
The simulator component is specifically as follows:
the pedal simulator comprises a pedal simulator, wherein a piston is arranged in the pedal simulator, the piston divides an inner cavity of the pedal simulator into two cavities, one cavity is a pedal simulation cavity, and the other cavity is internally provided with a spring which elastically connects the piston with the inner side wall of the inner cavity of the pedal simulator;
the simulator valve is connected between a chamber of the brake master cylinder and the pedal simulation chamber and is used for communicating the chamber of the brake master cylinder with the pedal simulation chamber;
includes a check valve connected between the chamber of the master cylinder and the pedal simulation chamber for permitting communication only from the pedal simulation chamber to the chamber of the master cylinder.
The pressure executing part:
the hydraulic control system comprises a pressurization module, a hydraulic circuit control module and a hydraulic control module, wherein the pressurization module is connected with a main cylinder control part and is used for pumping oil from the main cylinder control part, generating adjustable oil pressure through the pressurization control module and outputting the adjustable oil pressure to the hydraulic circuit control module;
the system comprises a pressurization control module, a main cylinder control part and a hydraulic circuit control module, wherein the pressurization control module and the main cylinder control part are respectively connected with the hydraulic circuit control module and used for adjusting and controlling the hydraulic pressure of oil output from the pressurization module to the hydraulic circuit control module;
the brake system comprises a hydraulic circuit control module, wherein the hydraulic circuit control module is connected between a pressurization control module and a brake wheel cylinder and is used for conveying oil under the oil pressure regulated by the pressurization module to the brake wheel cylinder needing braking as brake oil.
The brake wheel cylinder is used for receiving brake oil of the liquid path control module and generating brake force to realize braking.
The pressurization module comprises a motor and a pump set, the output end of the motor is connected with the control input end of the pump set, the motor drives the pump set to work, the oil inlet of the pump set is communicated with the main cylinder control part, and the oil outlet of the pump set is connected with the pressurization control module.
The supercharging control module is specifically as follows:
the oil return device comprises a pressure regulating valve, a pressure regulating valve and a liquid storage module, wherein the pressure regulating valve is connected between an oil inlet and an oil outlet of a pressurizing module and is used for returning oil liquid output by the oil outlet of the pressurizing module to the liquid storage module;
the oil-liquid connection pipeline is arranged between an oil outlet of the pressurization module and the liquid path control module and is directly connected with the liquid path control module.
The pressure regulating valve is a flow regulating valve and is an electromagnetic valve.
The target oil pressure monitored in real time by the master cylinder control part is fed back to the pressure regulating valve to regulate the opening and closing of the pressure regulating valve.
The coupling valve assembly is connected between the oil paths of the master cylinder control part and the pressure execution part, and is used for cutting off the oil paths of the master cylinder control part and the pressure execution part in an electric control mode so as not to enable the oil of the brake master cylinder control part to enter the pressure execution part; in the non-electric control mode, the oil passages of the main cylinder control part and the pressure execution part are communicated, and the pressure oil generated by the main cylinder control part is transmitted to the pressure execution part, so that the brake oil pressure is directly controlled.
The electric control mode is a normal electrified working mode, all valves can be electrified, and brake fluid of the brake master cylinder cannot enter the wheel cylinder and is separated by the electromagnetic valve in the state.
When the electric control mode of the main cylinder control part and the pressure execution part fails or the mechanical oil path control mode works, all the valves are powered off, the main cylinder control part and the pressure execution part are directly communicated with each other through an oil path, and the main cylinder hydraulic path is directly communicated with the brake wheel cylinder.
The coupling valve assembly is characterized in that;
the brake system comprises a first coupling valve, a second coupling valve and a control valve, wherein the first coupling valve is connected between a first chamber of a brake master cylinder and a pressure execution part and is used for opening and controlling the mechanical oil path communication between the master cylinder control part and the pressure execution part in a mechanical oil path control mode and closing and blocking the mechanical oil path communication between the master cylinder control part and the pressure execution part in an electric control mode;
the brake system comprises a first coupling valve and a second coupling valve, wherein the first coupling valve is connected between a first chamber of a brake master cylinder and a pressure execution part and is used for opening and controlling the mechanical oil path communication between the master cylinder control part and the pressure execution part in a mechanical oil path control mode and closing and blocking the mechanical oil path communication between the master cylinder control part and the pressure execution part in an electric control mode.
The brake master cylinder further comprises a pipeline arranged between the liquid storage module and the brake master cylinder, so that the brake master cylinder cavity and the liquid storage module are communicated in a limited mode.
The motor of the invention can adopt a brush motor, a corner position sensor is not required to be arranged, a full-bridge control circuit of the motor is not required to be arranged, and a pump part is not required to be provided with a transmission mechanism or a speed reducing mechanism.
In the invention, in order to solve the problem of slow response in the initial pressure buildup stage of the pump set driven by the motor, the pressurized brake oil delivered by the motor and the pump set is controlled by the valve to directly supply liquid to the brake wheel cylinder, and the medium-pressure energy accumulator is used for realizing the cooperative pressure buildup in the initial pressure buildup stage, so that the method is a new application and control method in a brake system, and the whole cost of a product can be reduced while the brake requirement is realized.
The invention has the beneficial effects that:
according to the invention, after the pressure in the brake wheel cylinder is controlled to a specific pressure by the linear liquid inlet valve, the brake force supplement under the energy recovery state can be realized, the real-time change of the wheel cylinder pressure in the energy recovery process is realized, and the energy recovery efficiency is improved. The pressure control mode is more direct, the requirement on a system controller is greatly reduced, and the manufacturing cost is reduced. The structure of the pressurizing unit is more compact, so that the overall quality and volume of the whole product are smaller. The invention can realize the anti-lock of wheels and the stable system of the vehicle body at the same time, and provides a good expansion platform for the expansion function of intelligent driving.
The invention adopts the overflow control of the pump with the valve, thereby greatly reducing the cost and saving other devices and elements which are necessary to be arranged.
Drawings
FIG. 1 is a block diagram of the inventive system connection in an electronically controlled mode of the present invention;
FIG. 2 is a diagram of the internal structural attachment framework of the boost control module of the present invention;
FIG. 3 is a schematic diagram of the internal oil circuit transfer control of the boost control module of the present invention;
FIG. 4 is a schematic diagram of the internal structure of the liquid storage module and the oil passage transmission thereof.
FIG. 5 is a block diagram of the system connections after the addition of the connection between the reservoir module and the master cylinder and the coupling valve assembly of the present invention in the electronically controlled mode;
FIG. 6 is a block diagram of the system connection in the mechanical oil path control mode of the present invention with the addition of the connection between the reservoir module and the master cylinder and the coupling valve assembly;
FIG. 7 is a graph of control current versus pressure that can be shut down for the pressure regulator valve of the present invention;
FIG. 8 is a graph of target pressure after brake application is initiated over time in accordance with an embodiment of the present invention.
In the figure: the device comprises a pressurization module 1, a pressurization control module 2, a liquid storage module 3, a liquid path control module 4, a brake master cylinder 5, a pedal displacement sensor 6, a simulator pressure sensor 7, a pedal simulator 8, a simulator valve 9 and a coupling valve assembly 10; a pressure regulating valve 21; motor 11, pump package 12.
PTS in fig. 1 refers to a PTS pedal displacement sensor.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the system specifically implemented is:
the master cylinder control part is used for receiving a target pressure signal generated by the control action of the external brake in real time, transmitting the target pressure signal to the pressure execution part;
the brake system comprises a pressure execution part with pressure regulation control, and is used for receiving a target pressure signal from a master cylinder control part in real time and executing braking through the pressure regulation control.
The brake system further comprises a controller, wherein the controller receives the simulated pressure signal of the master cylinder control part and generates a control signal to control the pressure regulating element of the pressure execution part to regulate the brake oil pressure.
The master cylinder control part comprises a liquid storage module 3, a brake master cylinder 5, a pedal displacement sensor 6, a simulator pressure sensor 7 and a simulator assembly, and specifically comprises the following components:
the device comprises a liquid storage module 3 for storing oil liquid;
in specific implementation, the liquid storage module 3 adopts a brake oil cup.
The hydraulic brake system comprises a master brake cylinder 5, wherein a cavity communicated with a liquid storage module 3 is arranged in the cylinder body, oil flows into the cavity from the liquid storage module 3, a piston in the cavity is synchronously connected with a pedal of a vehicle, and the cavity of the master brake cylinder 5 is connected with a liquid path control module 4 of a pressure execution part through a coupling valve assembly;
the device comprises a pedal displacement sensor 6, a brake device and a control device, wherein the pedal displacement sensor 6 is arranged at a pedal of a vehicle and is used for monitoring the moving distance and the braking state of the pedal and a piston in real time and backing up the pedal and the piston as a braking intention signal; the pedal displacement sensor is used as a calibration signal for only one pedal or is a driver braking intention signal, such as hard braking or slow braking. Meanwhile, after the simulator pressure sensor fails, or leakage of a liquid path occurs and the pressure sensor does not have a signal, whether a driver has a braking intention or not is detected through the pedal displacement sensor, so that the braking system is not failed, and the signal of the pedal displacement sensor is output and sent to the pressure execution part to be used as a backup signal.
The pressure sensor 7 comprises a simulator pressure sensor, is connected to a cavity of the brake master cylinder 5, is used for monitoring the oil pressure in the cavity in real time and then feeds back the oil pressure to the pressurization control module 2 of the pressure execution part;
comprises a simulator assembly connected to the chamber of the master cylinder 5 for sensing the oil pressure in the chamber of the master cylinder 5 and generating an elastic feedback force to react on the piston and the pedal.
Two chambers which are communicated with the liquid storage module 3 and are arranged adjacently in sequence are arranged in a cylinder body of the brake master cylinder 5, the two chambers are separated by another piston, one chamber is connected with a pedal of a vehicle through the piston to serve as a first chamber, and the other chamber serves as a second chamber; the pedal actuation pressure increases the oil pressure of the first chamber by the piston, and increases the oil pressure of the first chamber and then the second chamber.
The simulator pressure sensor 7 is connected to the first cavity of the brake master cylinder 5 and used for monitoring the oil pressure in the first cavity in real time and then feeding back the oil pressure to the pressurization control module 2 of the pressure execution part;
the simulator assembly is connected only to the first chamber of the master cylinder 5 for sensing the oil pressure in the first chamber of the master cylinder 5 and generating an elastic feedback force to exert a reaction force on the piston and pedal of the first chamber.
Simulator subassembly, specifically:
the pedal simulator comprises a pedal simulator 8, wherein a piston is arranged in the pedal simulator 8, the piston divides an inner cavity of the pedal simulator 8 into two cavities, one cavity is a pedal simulation cavity, and the other cavity is internally provided with a spring which elastically connects the piston with the inner side wall of the inner cavity of the pedal simulator 8;
the simulator valve 9 is connected between a cavity of the brake master cylinder 5 and the pedal simulation cavity and is used for communicating the cavity of the brake master cylinder 5 with the pedal simulation cavity; specifically, the simulator valve 9 is closed in the mechanical oil path control mode so that oil in the cavity of the brake master cylinder 5 does not enter the pedal simulation cavity, and the simulator valve 9 is opened in the electric control mode so that oil in the cavity of the brake master cylinder 5 enters the pedal simulation cavity. The simulator valve 9 is normally closed, i.e. normally non-conductive when not energized.
Comprises a one-way valve which is connected between the chamber of the brake master cylinder 5 and the pedal simulation chamber and is used for only allowing the flow from the pedal simulation chamber to the chamber of the brake master cylinder 5 and preventing the pressure in the pedal simulation chamber from being overlarge.
In a specific implementation, the brake system further comprises a coupling valve assembly 10 connected between the oil paths of the master cylinder control part and the pressure execution part, and in an electric control mode, the oil paths of the master cylinder control part and the pressure execution part are communicated, so that pressure oil generated by the master cylinder control part is transmitted to the pressure execution part, and brake oil pressure control is directly performed.
The coupling valve assembly 10 comprises a first coupling valve and a second coupling valve which are normally open, namely are conducted under the condition of normal non-electrification, specifically;
the brake system comprises a first coupling valve, a second coupling valve and a control module, wherein the first coupling valve is connected between a first chamber of a brake master cylinder 5 and a fluid path control module 4 of a pressure execution part and is used for opening and controlling the mechanical fluid path communication between the master cylinder control part and the pressure execution part in a mechanical fluid path control mode and closing and blocking the mechanical fluid path communication between the master cylinder control part and the pressure execution part in an electric control mode;
and the second coupling valve is connected between a second chamber of the brake master cylinder 5 and the hydraulic circuit control module 4 of the pressure execution part and is used for opening and controlling the mechanical oil circuit communication between the master cylinder control part and the pressure execution part in a mechanical oil circuit control mode and closing and blocking the mechanical oil circuit communication between the master cylinder control part and the pressure execution part in an electric control mode.
When in the mechanical oil path control mode, the coupling valve of the coupling valve assembly 10 and the simulator valve 9 are not electrified, the coupling valve is driven to be conducted, the simulator valve 9 is driven to be not conducted, so that the mechanical oil path between the master cylinder control part and the pressure execution part is communicated, and the chamber of the brake master cylinder and the pedal simulation chamber are not communicated; if the brake pedal is stepped on, the piston in the brake master cylinder is driven to move inwards to push the chamber in the brake master cylinder to be incapable of flowing into the pedal simulation chamber, and the chamber flows into the fluid path control module 4 through the coupling valve and is transmitted to flow into each brake wheel cylinder through the fluid path control module 4.
When in an electric control mode, the coupling valve of the coupling valve component 10 is electrified with the simulator valve 9 to drive the coupling valve to be not conducted and the simulator valve 9 to be conducted, so that a mechanical oil path between the master cylinder control part and the pressure execution part is not communicated, and a cavity of the brake master cylinder is communicated with the pedal simulation cavity; if the brake pedal is stepped on, the piston in the brake master cylinder is driven to move inwards to push the chamber in the brake master cylinder to flow into the pedal simulation chamber, but the chamber cannot flow into the fluid path control module 4 through the coupling valve, and the oil with the oil pressure generated by the pressurization module 1 is transmitted to flow into each brake wheel cylinder through the fluid path control module 4.
And a pipeline arranged between the liquid storage module 3 and the master cylinder 5, so that the cavity of the master cylinder 5 is in limited communication with the liquid storage module 3. When the pressure of the cavity of the master cylinder 5 is increased to exceed the threshold value, the cavity of the master cylinder 5 is not communicated with the liquid storage module 3; otherwise, the connection is made. This serves to return the oil in the chamber of the master cylinder 5 without affecting the operation of the chamber of the master cylinder 5.
In specific implementation, the cavity of the brake master cylinder 5 is divided into a first cavity and a second cavity, and the first cavity and the second cavity of the brake master cylinder 5 are connected with the liquid storage module 3 through a pipeline respectively.
The pressure execution part comprises a pressurization module 1, a pressurization control module 2, a liquid path control module 4 and a brake wheel cylinder:
the hydraulic control system comprises a pressurizing module 1, a hydraulic control module 2 and a hydraulic circuit control module 4, wherein the pressurizing module 1 is connected with a liquid storage module 3 of a main cylinder control part and is used for extracting oil from the liquid storage module 3 of the main cylinder control part, generating adjustable oil pressure through the pressurizing control module 2 and outputting the adjustable oil pressure to the hydraulic circuit control module 4;
the hydraulic brake system comprises a pressurization control module 2, wherein a liquid storage module 3 of a pressurization module 1 and a master cylinder control part is respectively connected with a liquid path control module 4 and is used for adjusting and controlling the oil pressure of oil output from the pressurization module 1 to the liquid path control module 4, namely adjusting the oil pressure of an input end of the liquid path control module 4, namely the brake oil pressure;
the connecting oil circuit pipeline between the pressurization module 1 and the liquid storage module 3 is different from the connecting oil circuit pipeline between the pressurization control module 2 and the liquid storage module 3, and the connecting oil circuit pipeline are independent pipelines which are not communicated with each other.
The brake system comprises a hydraulic circuit control module 4, a brake wheel cylinder and a brake wheel control module, wherein the hydraulic circuit control module 4 is connected between a pressurization control module 2 and the brake wheel cylinder and is used for conveying oil under the oil pressure regulated by the pressurization module 1 to the brake wheel cylinder needing braking as brake oil;
the brake wheel cylinder is used for receiving brake oil of the liquid path control module 4 and generating brake force to realize braking. The brake fluid flows into the brake wheel cylinder of the brake wheel cylinder.
As shown in fig. 4, the pressurizing module 1 includes a motor 11 and a pump set 12, an output end of the motor 11 is connected with a control input end of the pump set 12, the motor 11 drives the pump set 12 to work, an oil inlet of the pump set 12 is communicated with the liquid storage module 3 of the master cylinder control part, and an oil outlet of the pump set 12 is connected with the pressurizing control module 2.
The pump unit 12 is embodied as a gear pump or a plunger pump, but is not limited thereto.
As shown in fig. 2, the boost control module 2 includes a pressure regulating valve 21, specifically:
the oil return control device comprises a pressure regulating valve 21, wherein the pressure regulating valve is connected between an oil inlet and an oil outlet of a pump set 12 of a pressurizing module 1, namely between a liquid storage module 3 of a main cylinder control part and an oil outlet of the pump set 12 of the pressurizing module 1, and is used for returning oil output by the oil outlet of the pressurizing module 1 to the liquid storage module 3 and further regulating the oil pressure output by the oil outlet of the pressurizing module 1;
the oil-liquid connection pipeline is directly connected between an oil outlet of a pump group 12 of the pressurization module 1 and the liquid path control module 4.
The target oil pressure in the cavity of the brake master cylinder 5 monitored in real time by the simulator pressure sensor 7 of the master cylinder control part is combined with the execution oil pressure corresponding to the oil outlet of the pump set 12 converted from the working voltage of the output end of the motor 11 in the pressure execution part and fed back to the pressure regulating valve 21, the opening and closing and the opening of the pressure regulating valve 21 are regulated, the hydraulic line control brake is realized, and the fast, efficient and accurate brake oil pressure control is realized.
The motor 11 drives the pump set 12 to work and output oil pressure, and the oil pressure signal acquired by the pressure sensor 21 adjusts the opening of the pressure regulating valve 21 to control the pressure of the motor pump liquid. Particularly, when the system needs braking force, the pressurizing unit drives the pump set to provide continuous braking fluid with pressure for braking according to the actual braking force needed by the current braking so as to meet the braking requirement, and the pressure maintaining performance of the regulating valve is used.
The invention is mainly characterized in that the pressurization control module 2 with the pressure regulating valve 21 is additionally arranged and is arranged among the pressurization module 1, the liquid storage module 3 and the liquid path control module 4, so that the problem of overhigh brake oil pressure is avoided, accurate pressure regulation and stable pressure regulation of the brake oil pressure are realized, the problem of brake oil pressure fluctuation is solved, and the ABS locking problem can be solved.
As shown in fig. 1, in the mechanical oil path control mode, when the brake starts to perform a pressurization process, and the driver steps on the brake pedal, the coupling valve of the coupling valve assembly is not energized, so that the coupling valve is opened and conducted, the oil path between the master cylinder control portion and the pressure execution portion is connected, and the pedal pushes oil generated by the master cylinder control portion to directly enter the wheel cylinder of the brake wheel through the oil path of the coupling valve assembly and the oil path control module 4.
If in the case of the electric control mode, the brake begins to perform a pressurization process, and when a driver steps on a brake pedal, the coupling valve of the coupling valve assembly is electrified, so that the coupling valve is closed and is not conducted, and an oil path between the master cylinder control part and the pressure execution part is isolated. At the moment, the simulator valve 9 is electrified and conducted to connect the cavity of the brake master cylinder 5 and the pedal simulation cavity, oil in the cavity of the brake master cylinder 5 enters the pedal simulation cavity, brake foot feeling is simulated through the feedback acting force of a spring in the pedal simulator 8, and a pressure signal representing the brake intention is collected through the simulator pressure sensor 7.
In the pressure execution part, the motor 11 pushes the pump unit 12 to output brake oil with pressure and returns the brake oil with pressure through the pressure regulating valve 21 to regulate the finally output pressure.
In the final output pressure boosting process, the motor 11 drives the pump set 12 to output oil for pressurization so as to adjust the opening of the pressure regulating valve 21 to control the pressure of the oil output by the pump set 12, and further realize the change of the braking force in the braking process.
The working process and principle after the supercharging control module 2 is arranged in the invention are as follows:
under the non-braking state condition, the motor 11 of the pressurization module 1 does not operate, the pressure regulating valve 21 of the pressurization control module 2 is not electrified and is not conducted, and oil stored in the liquid storage module 3 cannot enter the liquid path control module 4 after passing through the pressurization module 1 and the pressurization control module 2.
When the pedal is stepped on, the brake is started, and under the condition of a braking state, the pedal pushes a piston in the brake master cylinder 5 to move through the connecting rod, the oil pressure in the cavity of the brake master cylinder 5 is increased, and the oil flows into a pedal simulation cavity of the pedal simulator 8 after passing through the opened simulator valve 9.
The increase of the oil pressure in the cavity of the brake master cylinder 5 is monitored by the simulator pressure sensor 7 in real time, the simulator pressure sensor 7 feeds back the signal of the increase of the oil pressure to the motor 11 of the pressurization module 1, the motor 11 drives the pump set 12 to work, as shown in figure 3, the pump set 12 extracts oil from the liquid storage module 3 and outputs the oil to the pressurization control module 2, and the oil directly enters the liquid path control module 4 through an oil connecting pipeline.
In a specific implementation, the rotation speed of the motor 11 is constant, so that the oil pressure output by the final pump group 12 is constant.
When the pressure of the oil output by the pump unit 12 is too high, the execution pressure of the oil output by the pump unit 12 of the pressurization module 1 to the hydraulic circuit control module 4 does not actually and accurately reach the target pressure corresponding to the oil pressure in the cavity of the brake master cylinder 5 monitored by the simulator pressure sensor 7 in real time, and further input to the hydraulic circuit control module 4 may damage the pipeline and the pipeline elements and the brake wheel cylinders thereof in the hydraulic circuit control module 4, which may reduce the service life if necessary and may cause burst to cause failure of the brake.
Under the condition, the pressure regulating valve 21 is opened through the intervention control of the pressurization control module 2, as shown in fig. 3, so that the oil flowing out of the oil outlet of the pump set 12 returns to the liquid storage module 3 through the pressure regulating valve 21, and the overhigh oil pressure output by the oil outlet of the pump set 12 is avoided.
The regulation process of the pressure regulating valve 21 is as follows:
firstly, converting the oil pressure in the cavity of the brake master cylinder 5 monitored by the simulator pressure sensor 7 in real time into the oil pressure corresponding to the oil outlet of the pump unit 12 according to the preset relation of the brake system as a target pressure P1, as shown in fig. 8;
since the current of the pressure regulating valve 21 can control the flow opening of the pressure regulating valve 21, the pressure that the pressure regulating valve 21 can close is affected, so that the pump unit 12 operates and outputs the oil pressure to the hydraulic circuit control module 4.
Finally, according to the correlation between the valve closing pressure and the control current of the pressure regulating valve 21, as shown in fig. 7, the target pressure P1 is input into the correlation to be converted to obtain the control current of the corresponding pressure regulating valve 21, and the pressure regulating valve 21 is further adjusted, so that the oil pressure actually output from the oil outlet of the pump unit 12 to the fluid circuit control module 4 meets the expectation of the target pressure P1, and the occurrence of the situation that the brake oil pressure is too high is avoided.
On one hand, the pressure regulating valve 21 is arranged between the oil outlets of the liquid storage module 3 and the pressurization module 1, so that the problem of overhigh brake oil pressure is avoided, and the pressure regulation of the brake oil pressure becomes possible.
On the other hand, the opening of the pressure regulating valve 21 is adjusted by feeding back the oil pressure monitored by the simulator pressure sensor 7 in real time, so that the rapid and effective pressure regulation and output of the brake oil pressure are realized, the phenomenon of brake oil pressure fluctuation is reduced and avoided, and the ABS locking condition is also reduced and avoided.
The process completes the generation and the transportation of the brake oil pressure so as to realize the braking. After the braking process is completed, the electric motor 11 is switched off and the pressure regulating valve 21 is closed.

Claims (10)

1. A hydraulic line control system is characterized in that:
the master cylinder control part is used for receiving a target pressure signal generated by the control action of the external brake in real time, transmitting the target pressure signal to the pressure execution part;
the brake system comprises a pressure execution part with pressure regulation control, and is used for receiving a target pressure signal from a master cylinder control part in real time and executing braking through the pressure regulation control.
2. A hydraulic line control system as claimed in claim 1, wherein:
the master cylinder control part is specifically as follows:
the device comprises a liquid storage module (3) for storing oil liquid;
the brake master cylinder comprises a brake master cylinder (5), wherein a cavity communicated with a liquid storage module (3) is arranged in the cylinder body, and a piston in the cavity is synchronously connected with a pedal;
the brake system comprises a pedal displacement sensor (6) which is arranged at a pedal and used for monitoring the moving distance of the pedal in real time and used as a braking intention signal;
the hydraulic brake system comprises a simulator pressure sensor (7), a pressure sensor and a pressure control part, wherein the simulator pressure sensor is connected to a cavity of a brake master cylinder (5) and used for monitoring the oil pressure in the cavity in real time and then sending the oil pressure to the pressure execution part in a feedback mode;
comprises a simulator assembly connected to the chamber of the master cylinder (5) for sensing the oil pressure in the chamber of the master cylinder (5) and generating an elastic feedback force to react on the piston and the pedal.
3. A hydraulic line control system as claimed in claim 2, wherein:
two chambers which are communicated with the liquid storage module (3) and are adjacently arranged in sequence are arranged in the cylinder body of the brake master cylinder (5), wherein one chamber is connected with the pedal through a piston and serves as a first chamber, and the other chamber serves as a second chamber;
the simulator pressure sensor (7) is connected to the first chamber or the second chamber of the brake master cylinder (5) and is used for monitoring the oil hydraulic pressure in the first chamber in real time and then sending the oil hydraulic pressure to the pressure execution part in a feedback mode;
the simulator assembly is connected to the first chamber or the second chamber of the master cylinder (5) and is used for sensing the oil pressure in the first chamber of the master cylinder (5) and generating elastic feedback force to exert reaction force on the piston and the pedal of the first chamber.
4. A hydraulic line control system as claimed in claim 2, wherein:
the simulator component is specifically as follows:
the pedal simulator comprises a pedal simulator (8), wherein a piston is arranged in the pedal simulator (8), the piston divides an inner cavity of the pedal simulator (8) into two cavities, one cavity is a pedal simulation cavity, and the other cavity is internally provided with a spring which elastically connects the piston with the inner side wall of the inner cavity of the pedal simulator (8);
the simulator valve (9) is connected between a cavity of the brake master cylinder (5) and the pedal simulation cavity and is used for communicating the cavity of the brake master cylinder (5) with the pedal simulation cavity;
comprises a one-way valve connected between the chamber of the master cylinder (5) and the pedal simulation chamber for allowing only the communication from the pedal simulation chamber to the chamber of the master cylinder (5).
5. A hydraulic line control brake system according to claim 1, wherein:
the pressure executing part:
the system comprises a pressurization module (1) connected with a master cylinder control part and used for extracting oil from the master cylinder control part, generating adjustable oil pressure through the pressurization control module (2) and outputting the adjustable oil pressure to a liquid path control module (4);
the hydraulic control system comprises a pressurization control module (2), wherein the pressurization control module (1) and a master cylinder control part are respectively connected with a liquid path control module (4) and used for adjusting and controlling the pressure of oil liquid output from the pressurization module (1) to the liquid path control module (4);
the brake system comprises a fluid path control module (4), wherein the fluid path control module is connected between a pressurization control module (2) and a brake wheel cylinder and is used for conveying oil under the oil pressure regulated by the pressurization module (1) to the brake wheel cylinder needing braking as brake oil.
6. A hydraulic line control system according to claim 5, wherein:
the booster module (1) comprises a motor (11) and a pump set (12), the output end of the motor (11) is connected with the control input end of the pump set (12), the motor (11) drives the pump set (12) to work, an oil inlet of the pump set (12) is communicated with the master cylinder control part, and an oil outlet of the pump set (12) is connected with the booster control module (2).
7. A hydraulic line control system according to claim 5 or 6, wherein:
the supercharging control module (2) is specifically as follows:
the hydraulic control system comprises a pressure regulating valve (21), a hydraulic control valve and a hydraulic control valve, wherein the pressure regulating valve (21) is connected between an oil inlet and an oil outlet of a pressurizing module (1) and is used for returning oil output by the oil outlet of the pressurizing module (1) to a liquid storage module (3), and the target oil pressure monitored in real time through a main cylinder control part is fed back to the pressure regulating valve (21) to regulate the opening and closing of the pressure regulating valve (21);
the oil-liquid connection pipeline is directly connected between an oil outlet of the pressurization module (1) and the liquid path control module (4).
8. A hydraulic line control system as claimed in claim 2, wherein:
the brake system also comprises a coupling valve assembly (10) which is connected between the oil paths of the master cylinder control part and the pressure execution part, and is used for cutting off the oil paths of the master cylinder control part and the pressure execution part when in an electric control mode so as not to allow the oil of the control part of the brake master cylinder (5) to enter the pressure execution part; in the non-electric control mode, the oil passages of the main cylinder control part and the pressure execution part are communicated, and the pressure oil generated by the main cylinder control part is transmitted to the pressure execution part, so that the brake oil pressure is directly controlled.
9. A hydraulic line control system according to claim 4 or 8, wherein:
the coupling valve assembly (10), in particular;
the brake system comprises a first coupling valve, a second coupling valve and a brake control system, wherein the first coupling valve is connected between a first chamber of a brake master cylinder (5) and a pressure execution part and is used for opening and controlling the mechanical oil path communication between the master cylinder control part and the pressure execution part in a mechanical oil path control mode and closing and blocking the mechanical oil path communication between the master cylinder control part and the pressure execution part in an electric control mode;
the brake system comprises a second coupling valve, wherein the second coupling valve is connected between a second chamber of a brake master cylinder (5) and a pressure execution part and is used for opening and controlling the mechanical oil path communication between the master cylinder control part and the pressure execution part in a mechanical oil path control mode and closing and blocking the mechanical oil path communication between the master cylinder control part and the pressure execution part in an electric control mode.
10. A hydraulic line control system as claimed in claim 2, wherein:
the brake system further comprises a pipeline arranged between the liquid storage module (3) and the brake master cylinder (5), so that the cavity of the brake master cylinder (5) is in limited communication with the liquid storage module (3).
CN202210503958.7A 2022-05-10 2022-05-10 Hydraulic line control braking system Active CN114954403B (en)

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Application Number Priority Date Filing Date Title
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103754210A (en) * 2014-01-08 2014-04-30 同济大学 Motor-driven electronic hydraulic braking system
CN107054330A (en) * 2016-11-25 2017-08-18 浙江亚太机电股份有限公司 A kind of Linear Control brakes and control method with energy regenerating
CN108162943A (en) * 2018-02-06 2018-06-15 吉林大学 The compound line control brake system and its brake control method of four-wheel pressure independent control
CN112406836A (en) * 2020-12-10 2021-02-26 吉林大学 Brake-by-wire system with backup function and control method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103754210A (en) * 2014-01-08 2014-04-30 同济大学 Motor-driven electronic hydraulic braking system
CN107054330A (en) * 2016-11-25 2017-08-18 浙江亚太机电股份有限公司 A kind of Linear Control brakes and control method with energy regenerating
CN108162943A (en) * 2018-02-06 2018-06-15 吉林大学 The compound line control brake system and its brake control method of four-wheel pressure independent control
CN112406836A (en) * 2020-12-10 2021-02-26 吉林大学 Brake-by-wire system with backup function and control method thereof

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