CN115626149A - Hydraulic braking system for vehicle and control method - Google Patents
Hydraulic braking system for vehicle and control method Download PDFInfo
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- CN115626149A CN115626149A CN202211636396.XA CN202211636396A CN115626149A CN 115626149 A CN115626149 A CN 115626149A CN 202211636396 A CN202211636396 A CN 202211636396A CN 115626149 A CN115626149 A CN 115626149A
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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
- B60T13/10—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
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Abstract
The hydraulic braking system comprises a power unit loop, wherein the power unit loop comprises an oil tank, the output end of the oil tank is communicated with a hydraulic pump, a direct-current motor is arranged inside the hydraulic pump, the output end of the hydraulic pump is communicated with an overflow valve, the output end of the overflow valve is communicated with a first check valve, the output end of the first check valve is communicated with a high-pressure filter, and the output end of the high-pressure filter is respectively communicated with a driving braking loop and a parking braking loop; the application sets the hydraulic system for the vehicle in detail, further improves the detection precision and the control adjustment compensation property, has higher stability and better adaptability, and simultaneously meets various braking working conditions and requirements of emergency braking, long-slope running braking, steep-slope parking braking, slow and stable deceleration braking, long-time parking braking, unpowered releasing braking and the like, so that the application scene is wider, and the application effect is more prominent.
Description
Technical Field
The application belongs to the technical field of automobile braking, and particularly relates to a hydraulic braking system for a vehicle and a control method.
Background
The medium-sized unmanned vehicle is a special vehicle which is about 10 tons in weight, has the fastest running speed of 80 kilometers per hour and adopts unmanned driving, and has the advantages of large weight, high speed, adaptability to various road conditions and scenes, high requirement on a braking system, large output braking force of a hydraulic braking system, reliable and stable braking of the vehicle due to a response speed block, and the like, so that the hydraulic braking system is selected as the braking system of the vehicle.
The hydraulic brake system of the medium-sized unmanned vehicle needs to meet the normal and stable work under various working conditions such as emergency braking, long-slope driving braking, steep-slope parking braking, slow and stable deceleration braking, long-time parking braking, unpowered brake release and the like, and the conventional common hydraulic brake system is difficult to meet the requirements, such as: the braking force is small, and the braking distance is long; the parking for a long time cannot be realized due to hydraulic leakage; the unpowered brake release function cannot be realized, and the like.
In the prior art, the method for adjusting the hydraulic braking adaptability of the vehicle under different situations is lacked, so that the hydraulic braking effect of the vehicle is poor in the driving process, the vehicle cannot be completely and effectively braked, and finally corresponding safety accidents occur.
Disclosure of Invention
An object of the present application is to address the above problems and provide a hydraulic brake system for a vehicle and a control method.
In order to achieve the above purpose, the present application provides the following technical solutions: the hydraulic braking system for the vehicle comprises a power unit loop, wherein the power unit loop comprises an oil tank, the output end of the oil tank is communicated with a hydraulic pump, the pump end of the hydraulic pump is connected with a direct current motor, the output end of the hydraulic pump is communicated with an overflow valve, the input end of the overflow valve is communicated with a first check valve in parallel, the output end of the first check valve is communicated with a high-pressure filter, and the output end of the high-pressure filter is respectively communicated with a service braking loop and a parking braking loop.
As an optimal technical scheme of this application, the service brake return circuit includes the second check valve, the input of second check valve with an output of high pressure filter is linked together, the output intercommunication of second check valve has the service brake energy storage ware, the output intercommunication of service brake energy storage ware has electromagnetic stop valve, electromagnetic stop valve with be equipped with first pressure sensor between the service brake energy storage ware, electromagnetic stop valve's other end intercommunication has electric proportion three-way pressure reducing valve, the output intercommunication of electric proportion three-way pressure reducing valve has the pressure boost ooff valve, the output intercommunication of pressure boost ooff valve has the decompression ooff valve, the parallelly connected intercommunication of input of decompression ooff valve has service brake cylinder, the decompression ooff valve with be equipped with second pressure sensor between the service brake cylinder.
According to a preferable technical scheme of the application, the parking brake loop comprises an electromagnetic switch valve, the input end of the electromagnetic switch valve is communicated with the other output end of the high-pressure filter, the output end of the electromagnetic switch valve is communicated with a parking brake energy accumulator, a third pressure sensor is arranged between the electromagnetic switch valve and the parking brake energy accumulator, the output end of the parking brake energy accumulator is communicated with a two-position three-way electromagnetic valve, the output end of the two-position three-way electromagnetic valve is communicated with a throttle valve, the output end of the throttle valve is communicated with a quick-change connector, the input end of the quick-change connector is communicated with a parking brake cylinder in parallel, a fourth pressure sensor is arranged between the quick-change connector and the parking brake cylinder, and all the components are communicated through oil pipelines.
A control method of a hydraulic brake system for a vehicle is used for hydraulically braking the vehicle, when the vehicle normally runs, the electromagnetic stop valve is powered on and closed, the input signal of the electric proportional three-way pressure reducing valve is 0, the pressure increasing switch valve is powered on and closed, the pressure reducing switch valve is powered on and opened, and the second pressure sensor detects that the pressure value in the service brake cylinder is lower than a set value; the electromagnetic switch valve is turned off when power is lost, the two-position three-way electromagnetic valve is electrified to be electrified, and the fourth pressure sensor detects that the pressure value in the parking brake cylinder is higher than a set value.
As a preferred technical scheme of the application, when a vehicle is emergently braked, the electromagnetic stop valve is powered off and opened, the input signal of the electric proportional three-way pressure reducing valve is a step 100% signal, the pressure-increasing switch valve is powered off and opened, the pressure-reducing switch valve is powered off and closed, and the second pressure sensor detects that the pressure value in the service brake cylinder is increased from low to a certain set value; the electromagnetic switch valve is closed when power is lost, the two-position three-way electromagnetic valve is unloaded when power is lost, and the fourth pressure sensor detects that the pressure value in the parking brake cylinder is reduced from high pressure to below a certain set value.
As an optimal technical scheme of this application, when the vehicle at long slope service brake, the electromagnetism stop valve loses the electricity and opens, electricity proportion three-way relief pressure valve is 20% to 80% step signal according to slope size input signal, the pressure boost ooff valve loses the electricity and opens, the pressure reduction ooff valve loses the electricity and closes, second pressure sensor detects pressure value in the service brake jar increases to certain setting value according to slope size determination from the low pressure.
As an optimal technical scheme of this application, when vehicle abrupt slope parking braking, the electromagnetism stop valve loses the electricity and opens, electricity proportion three-way pressure reducing valve input signal is step 100% signal, the pressure boost ooff valve loses the electricity and opens, the pressure reducing ooff valve loses the electricity and closes, second pressure sensor detects pressure value in the service brake jar increases to certain setting value after from low, the electromagnetism stop valve gets the electricity and closes, the pressure boost ooff valve gets the electricity and closes, the pressure reducing ooff valve loses the electricity and closes, second pressure sensor detects pressure value in the service brake jar keeps certain pressure stable, the service brake jar pressurize.
As a preferred technical scheme of the application, when a vehicle is slowly and stably decelerated and braked, the electromagnetic stop valve is powered off and opened, the electric proportional three-way pressure reducing valve inputs a step signal with a signal of 20% to 80% according to the required braking intensity, the pressure-increasing switch valve is powered off and opened, the pressure-reducing switch valve is powered off and closed, and the second pressure sensor detects that the pressure value in the service brake cylinder is increased from low pressure to a certain set value determined according to the braking intensity; the electromagnetic switch valve is closed when power is lost, the two-position three-way electromagnetic valve is unloaded when power is lost, and the fourth pressure sensor detects that the pressure value in the parking brake cylinder is reduced from high pressure to below a certain set value.
As a preferred technical scheme of the application, when a vehicle is parked and braked for a long time, the electromagnetic stop valve is opened in a power-off mode, the input signal of the electric proportional three-way pressure reducing valve is a step 100% signal, the pressure-increasing switch valve is opened in a power-off mode, the pressure-reducing switch valve is closed in a power-off mode, the second pressure sensor detects that the pressure value in the service brake cylinder is increased from low to a set value, and the electric proportional three-way pressure reducing valve is powered off; the electromagnetic switch valve is closed when power is lost, the two-position three-way electromagnetic valve is unloaded when power is lost, and the pressure sensor detects that the pressure value in the parking brake cylinder is reduced from high pressure to below a certain set value.
As a preferred technical scheme of the application, service braking and parking braking need to be released manually, and the pressure-reducing switch valve emergency operation handle is operated manually to enable the pressure-reducing switch valve to be opened completely and unloaded for more than 30 seconds; manually operating an emergency operation handle of the throttle valve to fully close the throttle valve; and the quick-change connector is externally connected with a manual pump, and the manual pump is operated to increase the pressure value in the parking brake cylinder and release the parking brake.
Compared with the prior art, the beneficial effects of this application are as follows:
1. the hydraulic brake system has the advantages that the hydraulic power unit loop, the service brake loop, the parking brake loop and other components are matched with one another, energy is saved, emission is reduced, stability and high efficiency are realized, the components are matched with one another and mutually support, the detection precision of the hydraulic brake and the adjustment compensation performance of control are further improved, the stability is higher, the adaptability is better, the energy is saved, the emission is reduced, and the environment is protected.
2. The invention further limits the control method of the hydraulic brake system for the vehicle, and simultaneously meets various brake working conditions and requirements of emergency brake, long-slope driving brake, steep-slope parking brake, slow and stable deceleration brake, long-time parking brake, unpowered brake release and the like, and has wider application scenes and more prominent application effect.
Drawings
FIG. 1 is a schematic diagram of a hydraulic braking system.
In the figure, 1, a fuel tank; 2. a hydraulic pump; 3. a direct current motor; 4. an overflow valve; 5. a first check valve; 6. a high pressure filter; 7. a second check valve; 8. a service brake accumulator; 901. a first pressure sensor; 902. a second pressure sensor; 903. a third pressure sensor; 904. a fourth pressure sensor; 1001. an electromagnetic cut-off valve; 1002. a pressure-increasing switching valve; 11. an electro-proportional three-way pressure reducing valve; 1201. a pressure reducing switch valve; 1202. an electromagnetic on-off valve; 13. a two-position three-way electromagnetic valve; 14. a throttle valve; 15. a quick-change connector; 16. a parking brake accumulator; 17. a service brake cylinder; 18. and (4) parking brake cylinders.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
As shown in fig. 1, a hydraulic braking system for a vehicle includes a power unit loop, the power unit loop includes an oil tank 1, an output end of the oil tank 1 is communicated with a hydraulic pump 2, a shaft end of the hydraulic pump 2 is connected with a direct current motor 3, an output end of the hydraulic pump 2 is communicated with an overflow valve 4, an input end of the overflow valve 4 is communicated with a first check valve 5 in parallel, an output end of the first check valve 5 is communicated with a high-pressure filter 6, an output end of the high-pressure filter 6 is respectively communicated with a service braking loop and a parking braking loop, the loop drives the hydraulic pump 2 to absorb oil and output high-pressure oil through the direct current motor 3, adjusts the pressure through the overflow valve 4, enters the high-pressure filter 6 through the first check valve 5, outputs clean high-pressure working oil from an outlet of the high-pressure filter 6, further provides required hydraulic oil for the service braking loop and the parking braking loop, and ensures the working stability and high efficiency of the hydraulic braking system for the vehicle.
The service brake loop comprises a second one-way valve 7, the input end of the second one-way valve 7 is communicated with one output end of a high-pressure filter 6, the output end of the second one-way valve 7 is communicated with a service brake accumulator 8, the output end of the service brake accumulator 8 is communicated with an electromagnetic stop valve 1001, a first pressure sensor 901 is arranged between the electromagnetic stop valve 1001 and the service brake accumulator 8, the other end of the electromagnetic stop valve 1001 is communicated with an electric proportional three-way pressure reducing valve 11, the output end of the electric proportional three-way pressure reducing valve 11 is communicated with a pressure-increasing switch valve 1002, the output end of the pressure-increasing switch valve 1002 is communicated with a pressure-reducing switch valve 1201, the output end of the pressure-reducing switch valve 1201 is communicated with a service brake cylinder 17, a second pressure sensor 902 is arranged between the pressure-reducing switch valve 1201 and the service brake cylinder 17, the loop is filled with high-pressure oil output by the power unit loop through the second one-way valve 7, and then filled into the service brake accumulator 8, and under the pressure detection and feedback control of the first pressure sensor 901, the high-pressure oil is filled into the service brake accumulator 8; according to a braking instruction sent by a running computer and a braking controller and a pressure signal fed back by a second pressure sensor 902, high-pressure oil stored in a running braking energy accumulator 8 is charged into a running braking cylinder 17 according to required pressure, flow and speed by controlling an electromagnetic stop valve 1001, an electric proportional three-way pressure reducing valve 11, a pressure-increasing switch valve 1002 and a pressure-reducing switch valve 1201, so that various actions and functions of pressure increase, pressure maintaining, pressure reduction, unloading and the like on the running braking cylinder 17 are realized, the working effect of the running braking cylinder 17 on vehicle braking is further realized, and the stability of a hydraulic braking system of the vehicle is ensured.
The parking brake loop comprises an electromagnetic switch valve 1202, the input end of the electromagnetic switch valve 1202 is communicated with the other output end of the high-pressure filter 6, the output end of the electromagnetic switch valve 1202 is communicated with a parking brake energy accumulator 16, a third pressure sensor 903 is arranged between the electromagnetic switch valve 1202 and the parking brake energy accumulator 16, the output end of the parking brake energy accumulator 16 is communicated with a two-position three-way electromagnetic valve 13, the output end of the two-position three-way electromagnetic valve 13 is communicated with a throttle valve 14, the output end of the throttle valve 14 is communicated with a quick-change connector 15, the input end of the quick-change connector 15 is communicated with a parking brake cylinder 18 in parallel, a fourth pressure sensor 904 is arranged between the quick-change connector 15 and the parking brake cylinder 18, all the parts are communicated through oil pipelines, the loop is filled with high-pressure oil output by a power unit loop through the electromagnetic switch valve 1202, the high-pressure oil is filled into the parking brake energy accumulator 16 firstly, and the high-pressure oil is filled into the parking brake energy accumulator 16 under the pressure detection and feedback control of a third pressure sensor 903; according to a braking instruction sent by a running computer and a braking controller and a pressure signal fed back by a fourth pressure sensor 904, high-pressure oil stored in a parking braking energy accumulator 16 is charged into a parking braking cylinder 18 according to the required pressure and flow rate by controlling a two-position three-way electromagnetic valve 13, a throttle valve 14 and a quick-change connector 15, so that actions and functions of pressurization, pressure maintaining, unloading and the like of the parking braking cylinder 18 are realized, and further, the effect of the parking braking cylinder 18 on vehicle braking is realized.
Specifically, the control method for the hydraulic brake system for the vehicle utilizes the hydraulic brake system for the vehicle to perform hydraulic brake on the vehicle, and specifically comprises the following steps:
before the vehicle runs, a hydraulic braking system is electrified, the direct current motor 3 gives an alarm in a non-abnormal state, a filter element of the high-pressure filter 6 gives an alarm in a non-blocked state, the first pressure sensor 901, the second pressure sensor 902, the third pressure sensor 903 and the fourth pressure sensor 904 give an alarm in a non-abnormal state, the whole device is in a stable working state, and the vehicle is convenient to start and run.
When the system detects that the pressure value fed back by the first pressure sensor 901 is lower than a set value, the direct current motor 3 is started, the hydraulic pump 2 outputs high-pressure oil, the high-pressure oil is filtered by the high-pressure filter 6 and then fills the service brake energy accumulator 8 with oil, until the pressure value fed back by the first pressure sensor 901 reaches the set value, the direct current motor 3 is stopped, the hydraulic pump 2 stops filling the service brake energy accumulator 8 with oil, the first pressure sensor 901 mainly plays a role in detecting and adjusting the hydraulic oil quantity in the service brake energy accumulator 8, the adjustment precision is higher, the detection efficiency is higher, the hydraulic oil in the service brake energy accumulator 8 is constantly guaranteed to be at stable oil pressure, and hydraulic braking is convenient to perform when a subsequent vehicle runs.
When the system detects that the pressure value fed back by the third pressure sensor 903 is lower than a set value, the direct current motor 3 is started, the hydraulic pump 2 outputs high-pressure oil, the high-pressure oil is filtered by the high-pressure filter 6 and then fills the parking brake energy accumulator 16 with the oil, the direct current motor 3 is stopped until the pressure value fed back by the third pressure sensor 903 reaches the set value, the hydraulic pump 2 stops filling the parking brake energy accumulator 16 with the oil, the hydraulic oil amount in the parking brake energy accumulator 16 is detected by the third pressure sensor 903, stable hydraulic oil is guaranteed to be stored in the parking brake energy accumulator 16, and therefore the running stability of a vehicle and the high efficiency of hydraulic brake are effectively guaranteed.
When the vehicle runs normally, the electromagnetic stop valve 1001 is powered on and closed, the input signal of the electric proportional three-way pressure reducing valve 11 is 0, the pressure-increasing switch valve 1002 is powered on and closed, the pressure-reducing switch valve 1201 is powered on and opened, the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 is lower than a set value, and the service brake cylinder 17 does not work; the electromagnetic switch valve 1202 is turned off when power is lost, the two-position three-way electromagnetic valve 13 is powered on and oil is supplied, the fourth pressure sensor 904 detects that the pressure value in the parking brake cylinder 18 is higher than a set value, the parking brake cylinder 18 stops braking due to the oil pressure of hydraulic oil in the parking brake cylinder 18, and the vehicle is in a stable running state.
When the vehicle is emergently braked, the electromagnetic stop valve 1001 is powered off and opened, the input signal of the electric proportional three-way pressure reducing valve 11 is a step 100% signal, the pressure-increasing switch valve 1002 is powered off and opened, the pressure-reducing switch valve 1201 is powered off and closed, the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 is increased from low to a set value, the service brake cylinder 17 is started to work and hydraulically brakes the vehicle; when the electromagnetic switch valve 1202 is turned off by a loss of power, the two-position three-way electromagnetic valve 13 is turned off by a loss of power and is unloaded, the fourth pressure sensor 904 detects that the pressure value in the parking brake cylinder 18 is reduced from a high pressure to a set value or less, and the parking brake cylinder 18 starts to operate under the action of oil pressure and performs braking due to the reduction of the oil pressure in the parking brake cylinder 18.
When a vehicle is braked during long-slope running, according to different slopes of a long slope, braking force required by hydraulic braking of the vehicle is different, specifically, the electromagnetic stop valve 1001 is powered off and opened, the electric proportional three-way pressure reducing valve 11 is a step signal with an input signal of 20% to 80% according to the size of the slope, the boost switch valve 1002 is powered off and opened, the pressure reducing switch valve 1201 is powered off and closed, the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 is increased from low pressure to a certain set value determined according to the size of the slope, the hydraulic braking force applied by the service brake cylinder 17 is adaptively adjusted according to different slopes, and then the vehicle is adjusted and braked, so that the adaptability and the stability of the vehicle are further improved.
When the vehicle can run at an unpowered constant speed, specifically, when the vehicle slides downwards on a long slope, the electromagnetic stop valve 1001 is powered on and closed, the pressure-increasing switch valve 1002 is powered on and closed, the pressure-reducing switch valve 1201 is powered off and closed, the second pressure sensor 902 detects a pressure value in the service brake cylinder 17 to keep a certain pressure stable, the service brake cylinder 17 maintains the pressure, and the service brake cylinder 17 performs stable hydraulic braking on the vehicle; when the electromagnetic switch valve 1202 is turned off in a power-off mode, the two-position three-way electromagnetic valve 13 is turned off in a power-off mode and unloaded, and the fourth pressure sensor 904 detects that the pressure value in the parking brake cylinder 18 is reduced from high pressure to below a set value, the parking brake cylinder 18 is started at the moment and cooperates with the service brake cylinder 17 to perform hydraulic braking on the vehicle.
When a vehicle is braked in a steep slope parking mode, the electromagnetic stop valve 1001 is powered off and opened, the input signal of the electric proportional three-way pressure reducing valve 11 is a step 100% signal, the pressure-increasing switch valve 1002 is powered off and opened, the pressure-reducing switch valve 1201 is powered off and closed, the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 is increased from low to a certain set value, the electromagnetic stop valve 1001 is powered on and closed, the pressure-increasing switch valve 1002 is powered on and closed, the pressure-reducing switch valve 1201 is powered off and closed, the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 keeps certain pressure stable, the service brake cylinder 17 maintains pressure, and at the moment, the service brake cylinder 17 performs stable hydraulic braking on the vehicle.
When the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 is continuously reduced due to leakage and reaches 80% of a certain set value, specifically, when the service brake cylinder 17 fails and has a problem of hydraulic oil leakage and the like, the electromagnetic stop valve 1001 is powered off and opened, the electric proportional three-way pressure reducing valve 11 inputs a 100% step signal, the boost switch valve 1002 is powered off and opened, the pressure reducing switch valve 1201 is powered off and closed, the service brake accumulator 8 supplements the service brake cylinder 17 to a certain set value and maintains the pressure until the abrupt slope parking brake command stops, the service brake cylinder 17 is supplemented with pressure in a self-adaptive manner through the process, the hydraulic oil in the service brake cylinder 17 is constantly ensured to be in a stable state, and further, major safety accidents caused by vehicle sliding and the like during abrupt slope braking of the vehicle are avoided.
When the electromagnetic switch valve 1202 is turned off in a power-off mode, the two-position three-way electromagnetic valve 13 is turned off in a power-off mode and unloaded, the fourth pressure sensor 904 detects that the pressure value in the parking brake cylinder 18 is reduced from high pressure to a set value, and then the parking brake cylinder 18 is synchronously started and cooperates with the service brake cylinder 17 to perform hydraulic braking on the vehicle.
When the vehicle is slowly and stably decelerated and braked, the vehicle needs to be slowly braked at the moment, the braking force of the vehicle does not need to be directly maximized at one time, and the braking force of a hydraulic braking system to the vehicle is adaptively adjusted according to a specific vehicle scene, the electromagnetic stop valve 1001 is powered off and opened, the electric proportional three-way pressure reducing valve 11 inputs a step signal with a signal of 20-80% according to the braking intensity requirement, the pressure increasing switch valve 1002 is powered off and opened, the pressure reducing switch valve 1201 is powered off and closed, the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 is increased from low pressure to a certain set value determined according to the braking intensity, and the hydraulic braking force applied to the vehicle by the service brake cylinder 17 is adaptively adjusted by means of the process, so that different hydraulic braking effects on the vehicle under the condition are met; the electromagnetic switch valve 1202 is turned off when power is lost, the two-position three-way electromagnetic valve 13 is turned off when power is lost and is unloaded, the fourth pressure sensor 904 detects that the pressure value in the parking brake cylinder 18 is reduced from high to a set value, and the parking brake cylinder 18 is matched with the service brake cylinder 17 to brake the vehicle synchronously.
When the vehicle is parked and braked for a long time, specifically, the vehicle stops at the roadside, the electromagnetic stop valve 1001 is powered off and opened, the input signal of the electric proportional three-way pressure reducing valve 11 is a step 100% signal, the pressure-increasing switch valve 1002 is powered off and opened, the pressure-reducing switch valve 1201 is powered off and closed, the second pressure sensor 902 detects that the pressure value in the service brake cylinder 17 is increased from low to a certain set value, the electric proportional three-way pressure reducing valve 11 is powered off, and then the service brake cylinder 17 works stably and performs stable hydraulic braking on the vehicle; when the electromagnetic switch valve 1202 is turned off in a power-off mode, the two-position three-way electromagnetic valve 13 is turned off in a power-off mode for unloading, the fourth pressure sensor 904 detects that the pressure value in the parking brake cylinder 18 is reduced from high to below a set value, the power supply of the whole hydraulic brake system of the vehicle is cut off, and the vehicle is kept in a parking and stopping state for a long time.
When the vehicle is in the condition that a power supply is not electrified or the power supply is lost, and an external force trailer needs to move the vehicle, the service brake and the parking brake need to be manually released, the pressure reducing switch valve 1201 is manually operated to operate the emergency operating handle, so that the pressure reducing switch valve 1201 is completely opened and unloaded for more than 30 seconds, then the hydraulic oil in the service brake cylinder 17 is continuously decompressed along the pressure reducing switch valve 1201 at the moment, and the pressure value detected by the second pressure sensor 902 is reduced; simultaneously, an emergency operation handle of the throttle valve 14 is manually operated, so that the throttle valve 14 is completely closed; the quick-change coupler 15 is externally connected with a manual pump, the manual pump is operated to increase the pressure value in the parking brake cylinder 18, the pressure value detected by the fourth pressure sensor 904 is increased, the parking brake is released, and the external trailer can move the vehicle.
The device carries out detailed settlement to the hydraulic system that the vehicle was used, and each part is cooperateed and is mutually supported, and further improvement detects the regulation compensatory nature of precision and control, and stability is higher, and adaptability is better, still satisfies various braking operating modes and requirements such as its emergency braking, long-slope traveling braking, abrupt slope parking braking, slow steady deceleration braking, long-time parking braking, unpowered release braking simultaneously, and the application scene is more extensive, and the application effect is more outstanding.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The hydraulic braking system for the vehicle comprises a power unit loop and is characterized in that the power unit loop comprises an oil tank, the output end of the oil tank is communicated with a hydraulic pump, the pump shaft end of the hydraulic pump is connected with a direct current motor, the output end of the hydraulic pump is communicated with an overflow valve, the input end of the overflow valve is communicated with a first check valve in parallel, the output end of the first check valve is communicated with a high-pressure filter, and the output end of the high-pressure filter is respectively communicated with a driving braking loop and a parking braking loop.
2. The hydraulic brake system for a vehicle according to claim 1, characterized in that: the service brake circuit comprises a second one-way valve, the input end of the second one-way valve is communicated with the output end of the high-pressure filter, the output end of the second one-way valve is communicated with a service brake energy accumulator, the output end of the service brake energy accumulator is communicated with an electromagnetic stop valve, the electromagnetic stop valve is provided with a first pressure sensor between the service brake energy accumulators, the other end of the electromagnetic stop valve is communicated with an electric proportional three-way pressure reducing valve, the output end of the electric proportional three-way pressure reducing valve is communicated with a pressure-increasing switch valve, the output end of the pressure-increasing switch valve is communicated with a pressure-reducing switch valve, the input end of the pressure-reducing switch valve is communicated with a service brake cylinder in parallel, and the pressure-reducing switch valve is provided with a second pressure sensor between the service brake cylinders.
3. The hydraulic brake system for a vehicle according to claim 2, characterized in that: the parking brake loop comprises an electromagnetic switch valve, the input end of the electromagnetic switch valve is communicated with the other output end of the high-pressure filter, the output end of the electromagnetic switch valve is communicated with a parking brake energy accumulator, a third pressure sensor is arranged between the electromagnetic switch valve and the parking brake energy accumulator, the output end of the parking brake energy accumulator is communicated with a two-position three-way electromagnetic valve, the output end of the two-position three-way electromagnetic valve is communicated with a throttle valve, the output end of the throttle valve is communicated with a quick-change connector, the input end of the quick-change connector is communicated with a parking brake cylinder in parallel, a fourth pressure sensor is arranged between the quick-change connector and the parking brake cylinder, and all the components are communicated through oil way pipelines.
4. A control method of a hydraulic brake system for a vehicle, which hydraulically brakes the vehicle using the hydraulic brake system for a vehicle according to claim 3, wherein when the vehicle is normally running, the electromagnetic cut-off valve is electrically closed, the input signal of the electro-proportional three-way pressure reducing valve is 0, the pressure-increasing switch valve is electrically closed, the pressure-reducing switch valve is electrically opened, and the second pressure sensor detects that the pressure value in the service brake cylinder is lower than a set value; the electromagnetic switch valve is closed when power is lost, the two-position three-way electromagnetic valve is electrified and oil is supplied, and the fourth pressure sensor detects that the pressure value in the parking brake cylinder is higher than a set value.
5. The control method of a hydraulic brake system for a vehicle according to claim 4, characterized in that, when the vehicle is braked suddenly, the electromagnetic cut-off valve is open when power is lost, the input signal of the electric proportional three-way pressure reducing valve is a step 100% signal, the pressure-increasing switch valve is open when power is lost, the pressure-reducing switch valve is closed when power is lost, and the second pressure sensor detects that the pressure value in the service brake cylinder increases from low to a set value; the electromagnetic switch valve is closed when power is lost, the two-position three-way electromagnetic valve is unloaded when power is lost, and the fourth pressure sensor detects that the pressure value in the parking brake cylinder is reduced from high pressure to below a certain set value.
6. The control method of a hydraulic brake system for a vehicle according to claim 4, wherein when the vehicle is braked during a long-slope running, the electromagnetic cut-off valve is electrically de-energized to open, the electric proportional three-way pressure reducing valve is a step signal of 20% to 80% according to a gradient magnitude input signal, the pressure-increasing on-off valve is electrically de-energized to open, the pressure-reducing on-off valve is electrically de-energized to close, and the second pressure sensor detects that the pressure value in the service brake cylinder increases from a low pressure to a set value determined according to a gradient magnitude.
7. The method of claim 4, wherein when the vehicle is braked by a steep slope, the electromagnetic cut-off valve is electrically de-energized and opened, the input signal of the electric proportional three-way pressure reducing valve is a step 100% signal, the pressure-increasing switch valve is electrically de-energized and opened, the pressure-reducing switch valve is electrically de-energized and closed, the second pressure sensor detects that the pressure value in the service brake cylinder increases from a low value to a set value, the electromagnetic cut-off valve is electrically energized and closed, the pressure-increasing switch valve is electrically energized and closed, the pressure-reducing switch valve is electrically de-energized and closed, the second pressure sensor detects that the pressure value in the service brake cylinder keeps a certain pressure and is stable, and the service brake cylinder is electrically pressurized.
8. The control method of the hydraulic brake system for the vehicle according to claim 4, wherein when the vehicle is slowly braked at a smooth deceleration, the electromagnetic cut-off valve is de-energized and opened, the electric proportional three-way pressure reducing valve is a step signal with 20% to 80% of the input signal according to the brake intensity requirement, the pressure increasing switch valve is de-energized and opened, the pressure reducing switch valve is de-energized and closed, and the second pressure sensor detects that the pressure value in the service brake cylinder is increased from a low pressure to a certain set value determined according to the brake intensity; the electromagnetic switch valve is closed when power is lost, the two-position three-way electromagnetic valve is unloaded when power is lost, and the fourth pressure sensor detects that the pressure value in the parking brake cylinder is reduced from high pressure to below a certain set value.
9. The control method of a hydraulic brake system for a vehicle according to claim 4, wherein when the vehicle is parked and braked for a long time, the electromagnetic cut-off valve is open when power is lost, the input signal of the electric proportional three-way pressure reducing valve is a step 100% signal, the pressure-increasing switch valve is open when power is lost, the pressure-reducing switch valve is closed when power is lost, the second pressure sensor detects that the pressure value in the service brake cylinder increases from low to a certain set value, and the electric proportional three-way pressure reducing valve is powered off; the electromagnetic switch valve is closed when power is lost, the two-position three-way electromagnetic valve is unloaded when power is lost, and the pressure sensor detects that the pressure value in the parking brake cylinder is reduced from high pressure to below a certain set value.
10. The control method of a hydraulic brake system for a vehicle according to claim 4, wherein a service brake and a parking brake need to be manually released, and the relief switching valve emergency operation handle is manually operated to fully open the relief switching valve for unloading for more than 30 seconds; manually operating an emergency operating handle of a throttle valve to fully close the throttle valve; and the quick-change connector is externally connected with a manual pump, and the manual pump is operated to increase the pressure value in the parking brake cylinder and release the parking brake.
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