CN114954400A - Electronic hydraulic brake mechanism, system and electronic hydraulic brake control method - Google Patents

Electronic hydraulic brake mechanism, system and electronic hydraulic brake control method Download PDF

Info

Publication number
CN114954400A
CN114954400A CN202210713330.XA CN202210713330A CN114954400A CN 114954400 A CN114954400 A CN 114954400A CN 202210713330 A CN202210713330 A CN 202210713330A CN 114954400 A CN114954400 A CN 114954400A
Authority
CN
China
Prior art keywords
pressure
brake
valve
braking
hydraulic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202210713330.XA
Other languages
Chinese (zh)
Other versions
CN114954400B (en
Inventor
施国标
孙惠春
韩冲
王军
刘鑫旺
曹景昭
王文伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Automotive Research Institute of Beijing University of Technology
Original Assignee
Shenzhen Automotive Research Institute of Beijing University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Automotive Research Institute of Beijing University of Technology filed Critical Shenzhen Automotive Research Institute of Beijing University of Technology
Priority to CN202210713330.XA priority Critical patent/CN114954400B/en
Publication of CN114954400A publication Critical patent/CN114954400A/en
Application granted granted Critical
Publication of CN114954400B publication Critical patent/CN114954400B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • 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
    • 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

Landscapes

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

Abstract

The invention relates to the technical field of vehicle braking, in particular to an electronic hydraulic braking mechanism, an electronic hydraulic braking system and an electronic hydraulic braking control method. The electronic hydraulic brake mechanism of this scheme provides the pressure source for brake assembly jointly through control unit control hydraulic pump and energy storage ware, and parallelly connected the high pressure energy storage ware on main oil circuit, be used for eliminating piston idle stroke and braking clearance fast, then carry out the pressure boost through hydraulic pump work, and control the change of braking force through adjusting pressure-increasing valve and relief pressure valve, the realization is to the braking function of vehicle, through the electronic hydraulic brake mechanism of this scheme of adoption, occupation space is little, response speed is fast, high reliability, hydraulic brake system structure among the prior art is complicated effectively solved, the lower problem of reliability.

Description

Electronic hydraulic brake mechanism, system and electronic hydraulic brake control method
Technical Field
The invention relates to the technical field of vehicle braking, in particular to an electronic hydraulic braking mechanism, an electronic hydraulic braking system and an electronic hydraulic braking control method.
Background
With the rapid development of automobile technology, the brake system is also developed in a direction of high integration. The electronic hydraulic brake system is a novel brake system and is one of brake-by-wire, a brake pedal and a brake wheel cylinder are mechanically decoupled, and a hydraulic actuator is used for completing brake operation; the electronic hydraulic brake system is mature in technology and safe and stable in operation, is successfully applied to various vehicles, and is the main development direction of the current overall requirements of the automobile industry, the industrial requirements of new energy automobiles and the future automobile braking.
At present, in the existing electronic hydraulic brake technology, a central integrated hydraulic system is usually adopted to control braking of four wheels respectively, and the central integrated hydraulic system not only has a complex structure, a large occupied space, a long hydraulic pipeline and low reliability, but also is difficult to be applied to a wheel-side integrated system with high development heat. Therefore, it is necessary to design an electro-hydraulic brake mechanism and a brake system that have high reliability, small size, and the capability of implementing a parking function.
Disclosure of Invention
The electronic hydraulic brake mechanism, the electronic hydraulic brake system and the electronic hydraulic brake control method solve the problems that a hydraulic brake system in the prior art is complex in structure and low in reliability.
According to a first aspect, an embodiment provides an electro-hydraulic brake mechanism, comprising a brake assembly, a control unit, a main pressure supply oil path and an auxiliary pressure supply oil path arranged in parallel with the main pressure supply oil path;
the main pressure supply oil way is provided with a liquid storage device, a hydraulic pump, a pressure increasing valve, a pressure reducing valve and a pressure sensor, the inlet end of the hydraulic pump is communicated with the liquid storage device, and the outlet end of the hydraulic pump is communicated with the inlet end of the pressure increasing valve; the outlet end of the pressure increasing valve is communicated with the brake assembly; the inlet end of the pressure reducing valve is communicated with the outlet end of the pressure increasing valve, and the outlet end of the pressure reducing valve is communicated with the liquid storage device; the pressure sensor is arranged on an oil path between the pressure increasing valve and the brake assembly;
the auxiliary pressure supply oil way is provided with an energy accumulator and a switch valve, the inlet end of the energy accumulator is communicated with the outlet end of the hydraulic pump, and the outlet end of the energy accumulator is communicated with the inlet end of the pressure increasing valve through the switch valve;
the control unit is respectively and electrically connected with the hydraulic pump, the pressure increasing valve, the pressure reducing valve, the pressure sensor, the energy accumulator and the switch valve and is used for controlling the main pressure supply oil way and the auxiliary pressure supply oil way to supply pressure to the brake assembly so as to realize braking of the automobile wheels.
In a possible implementation embodiment, an overflow valve is further disposed on the main pressure supply path, an inlet end of the overflow valve is communicated with an outlet end of the hydraulic pump, and an outlet end of the overflow valve is communicated with the reservoir.
In a possible implementation example, a safety valve is further arranged on the main pressure supply circuit, and the safety valve is arranged in parallel with the pressure reducing valve.
In one possible embodiment, the pressure of the energy accumulator is greater than the maximum pressure required for braking by the electrohydraulic brake mechanism.
In one possible implementation example, the switching valve and the pressure increasing valve are normally open solenoid valves, and the pressure reducing valve is a normally closed solenoid valve.
In a possible implementation example, a check valve is further disposed on the auxiliary pressure supply oil path, and the check valve is disposed on an oil path between the hydraulic pump and the accumulator.
According to a second aspect, an embodiment provides an electro-hydraulic brake system, comprising the above-mentioned electro-hydraulic brake mechanism, a pedal simulation sensor and a control module;
the electronic hydraulic brake mechanism is arranged at the wheel edge of the automobile wheel and used for completing the braking of the automobile wheel;
the pedal simulation sensor is used for converting pedal force into an electric signal and sending the electric signal to the control module;
the control module is electrically connected with the electronic hydraulic braking mechanism and used for controlling the electronic hydraulic braking mechanism to brake the automobile wheels according to the received electric signals.
According to a third aspect, an embodiment provides an electronic hydraulic brake control method, which employs the electronic hydraulic brake mechanism, including the steps of:
receiving signals of a pedal simulation sensor;
and controlling the electronic hydraulic brake mechanism to brake the automobile wheels according to the received signals of the pedal simulation sensor.
In one possible implementation, the controlling the electro-hydraulic brake mechanism to brake the wheels of the automobile according to the received signal of the pedal simulation sensor includes:
controlling the electronic hydraulic brake mechanism to select a brake pressure mode according to the received signal of the pedal simulation sensor, wherein the brake pressure mode comprises a pressure boost mode, a pressure maintaining mode and a pressure reduction mode;
and braking the automobile wheels according to the selected brake pressure mode.
In one possible implementation example, when the brake pressure mode selected by the control module is a boosting mode, the electronic hydraulic brake mechanism is controlled to brake the vehicle in a service mode;
when the brake pressure mode selected by the control module is a pressure maintaining mode, controlling the electronic hydraulic brake mechanism to perform parking brake, emergency brake or service brake on the vehicle;
and when the brake pressure mode selected by the control module is a decompression mode, controlling the electronic hydraulic brake mechanism to brake the vehicle.
According to the electronic hydraulic brake mechanism of the embodiment, the hydraulic pump and the energy accumulator are controlled by the control unit to provide a pressure source for the brake assembly together, the high-pressure energy accumulator is connected to the main oil path in parallel and used for quickly eliminating the idle stroke and the brake clearance of the piston, then the hydraulic pump works to boost pressure, and the change of the brake force is controlled by adjusting the booster valve and the pressure reducing valve, so that the brake function of the vehicle is realized.
Drawings
Fig. 1 is a first structural schematic diagram of an electronic hydraulic brake mechanism according to an embodiment of the present invention;
FIG. 2 is a second schematic structural diagram of an electro-hydraulic brake mechanism according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an electro-hydraulic brake system according to an embodiment of the present invention;
FIG. 4 is a flow chart of an electro-hydraulic brake control method provided by an embodiment of the present invention;
FIG. 5 is a flow chart illustrating the operation of the electro-hydraulic brake mechanism to brake the wheels of the vehicle according to the embodiment of the present invention;
fig. 6 is a control schematic diagram of an electro-hydraulic brake system according to an embodiment of the present invention.
Reference numerals: 1. a reservoir; 2. a hydraulic pump; 3. an accumulator; 4. an on-off valve; 5. a pressure increasing valve; 6. a pressure sensor; 7. a brake assembly; 71. a caliper body; 72. a brake disc; 8. a pressure reducing valve; 9. a one-way valve; 10. an overflow valve; 11. a safety valve; 100. an electro-hydraulic brake mechanism; 200. a pedal analog sensor; 300. and a control module.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified.
The existing electronic hydraulic braking technology generally adopts a central integrated hydraulic system to respectively control the braking of four wheels, so that the structure is complex, the occupied space is large, the hydraulic pipeline is long, and the electronic hydraulic braking technology is difficult to be applied to a wheel edge integrated system. Aiming at the problems, the invention provides an electronic hydraulic brake mechanism, an electronic hydraulic brake system and an electronic hydraulic brake control method which have the advantages of small occupied space, strong reliability and short hydraulic pipeline and can be applied to a wheel edge integrated system. The electronic hydraulic brake mechanism, the electronic hydraulic brake system and the electronic hydraulic brake control method are mainly applied to the field of automobile drive-by-wire chassis, the distributed electronic hydraulic brake system pedal and the brake system are completely mechanically decoupled, the working principle is simple, the response speed is high, the reliability is high, the hydraulic elements are integrally arranged, the high integration of the electronic hydraulic brake system is completed, the electronic hydraulic brake system can be independently applied to a wheel edge integrated system, the independent control of wheel braking is realized, the parking brake function is realized, and the application prospect is good.
Example 1
Referring to fig. 1, the present embodiment provides an electro-hydraulic brake mechanism 100, which includes a brake assembly 7, a control unit, a main pressure supply circuit, and an auxiliary pressure supply circuit connected in parallel to the main pressure supply circuit. The brake assembly 7 includes a caliper body 71 and a brake disc 72.
Specifically, a liquid storage device 1, a hydraulic pump 2, a pressure increasing valve 5, a pressure reducing valve 8 and a pressure sensor 6 are arranged on a main pressure supply oil way, the inlet end of the hydraulic pump 2 is communicated with the liquid storage device 1, and the outlet end of the hydraulic pump 2 is communicated with the inlet end of the pressure increasing valve 5; the outlet end of the pressure increasing valve 5 is communicated with a brake component 7; the inlet end of the pressure reducing valve 8 is communicated with the outlet end of the pressure increasing valve 5, and the outlet end of the pressure reducing valve 8 is communicated with the liquid reservoir 1; the pressure sensor 6 is provided on an oil path between the pressure increasing valve 5 and the brake assembly 7. The auxiliary pressure supply oil way is provided with an energy accumulator 3 and a switch valve 4, the inlet end of the energy accumulator 3 is communicated with the outlet end of the hydraulic pump 2, and the outlet end of the energy accumulator 3 is communicated with the inlet end of the pressure increasing valve 5 through the switch valve 4; the control unit is respectively and electrically connected with the hydraulic pump 2, the pressure increasing valve 5, the pressure reducing valve 8, the pressure sensor 6, the energy accumulator 3 and the switch valve 4 and is used for controlling the main pressure supply oil way and the auxiliary pressure supply oil way to provide pressure for the brake assembly 7, so that the brake of the automobile wheels is realized.
In practical application, the electronic hydraulic brake mechanisms 100 are arranged in a wheel-side integrated system, and a hydraulic integrated block model is adopted, wherein the switch valve 4 and the pressure increasing valve 5 are normally open solenoid valves, and the pressure reducing valve 8 is a normally closed solenoid valve, so that when the electronic hydraulic brake mechanisms are used, the control module 300 controls the electronic hydraulic brake mechanisms 100 respectively arranged at the wheel sides of four automobile wheels to brake the automobile wheels after receiving signals of the pedal simulation sensor 200. Specifically, as shown in fig. 6, when the vehicle starts to run normally, the control unit receives the brake release information of the control module 300, controls the switch valve 4 to close, opens the pressure reducing valve 8 for a period of time to close, when the vehicle needs to brake, the control unit receives the service brake information of the control module 300, controls the pressure reducing valve 8 to be in a closed state, and opens the hydraulic pump 2, the switch valve 4 and the accumulator 3, because the hydraulic pump 2 has a period of reaction time in the process of starting to work, the pressure at this time cannot be supplied in time, it is necessary to provide a pressure source for the brake assembly 7 through the work of the accumulator 3, the accumulator 3 can quickly react and eliminate the idle stroke and the brake gap of the piston, the brake response time is reduced, after the pressure of the hydraulic pump 2 is supplied, the accumulator 3 is closed, only the switch valve 4 needs to be closed, and the accumulator 3 can be closed, the hydraulic pump 2 works to boost, at the moment, the control unit judges the sizes of the actual brake pressure and the target brake pressure through pressure information on a main pressure supply oil way fed back by the pressure sensor 6, when the actual brake pressure is judged to be smaller than the target brake pressure, the hydraulic pump 2 continues to supply pressure, when the actual brake pressure is judged to be larger than the target brake pressure, the size of the brake pressure is controlled by adjusting the duty ratios of the booster valve 5 and the pressure reducing valve 8, when the actual brake pressure is judged to be equal to the target brake pressure, the duty ratios of the booster valve 5 and the pressure reducing valve 8 are kept unchanged, and service braking is completed. When the brake is released, the switch valve 4 and the pressure increasing valve 5 are closed, the pressure reducing valve 8 is opened for a period of time and then closed, the hydraulic pump 2 continues to work to supplement pressure to the energy accumulator 3, when the pressure in the energy accumulator 3 reaches a certain value (the pressure of the energy accumulator 3 is ensured to be larger than the maximum pressure required by the brake), the hydraulic pump 2 is closed, and then the pressure increasing valve 5 is opened (namely, the normal state is recovered). When the vehicle is parked and braked, the control unit controls the hydraulic pump 2 to stop working after receiving the parking brake information sent by the control module 300, and controls the switch valve 4, the pressure increasing valve 5 and the pressure reducing valve 8 to be in a normal state (namely the switch valve 4 and the pressure increasing valve 5 are normally open, and the pressure reducing valve 8 is normally closed) when the power is off, and at the moment, the high-pressure accumulator 3 provides pressure to complete the parking brake function of the vehicle. The electronic hydraulic brake mechanism 100 can still provide brake pressure by the high-pressure energy accumulator 3 after the vehicle stops, and has the functions of service braking and parking braking.
The working principle of the electronic hydraulic brake mechanism 100 of the present embodiment is as shown in fig. 1, a pressure source is provided by a hydraulic pump 2 and an accumulator 3 together, the accumulator 3 is connected in parallel to a main oil line, and is mainly used for rapidly eliminating a piston idle stroke and a brake clearance, then the hydraulic pump 2 works to boost pressure, and the change of the braking force is controlled by adjusting a pressure boosting valve 5 and a pressure reducing valve 8, the pressure change in the braking process mainly has three modes, and the specific pressure change process principle is as follows:
when the vehicle needs to be braked, the active boosting mode is used: the pressure reducing valve 8 is closed, the switch valve 4 and the pressure increasing valve 5 are opened, the switch valve 4 is closed after the idle stroke and the braking clearance of the piston are rapidly eliminated through the work of the energy accumulator 3, then the braking component 7 is pressurized through the work of the hydraulic pump 2, and then the braking component 7 acts on the automobile wheels, so that the service braking of the automobile is realized. Wherein, in the process of active pressurization, one or more pulse signals are given to the switch valve 4, and the switch valve 4 is closed after the switch valve 4 is opened for one or more pulse signals.
When the vehicle needs parking braking or emergency braking or service braking, the pressure maintaining mode is used: the switch valve 4, the pressure increasing valve 5 and the pressure reducing valve 8 are powered off and restored to the normal state (namely, the switch valve 4 is normally opened, the pressure increasing valve 5 is normally opened and the pressure reducing valve 8 is normally closed), and then the accumulator 3 supplies pressure to the brake assembly 7 to complete the parking function or emergency braking of the vehicle. It should be noted that the specific case of using the pressure maintaining mode during the braking of the vehicle is as follows: when the vehicle runs on a long downhill, the vehicle is in a braking state for a long time, and the vehicle runs all the time with braking force, and the service braking can be carried out by using the pressure maintaining mode.
When the vehicle needs to be braked, the decompression mode is used: and closing the switch valve 4 and the pressure increasing valve 5, opening the pressure reducing valve 8, continuously working the hydraulic pump 2 to supplement pressure to the energy accumulator 3, stopping the hydraulic pump 2 after a certain pressure is reached, and stopping the braking of the automobile wheels by the braking component 7 to realize the release of the braking of the automobile, wherein the pressure acting on the braking component 7 has no pressure source.
Referring to fig. 2, an overflow valve 10 is further disposed on the main pressure supply path, an inlet end of the overflow valve 10 is communicated with an outlet end of the hydraulic pump 2, and an outlet end of the overflow valve 10 is communicated with the reservoir 1.
In this embodiment, the overflow valve 10 is added to the main pressure supply oil path, specifically, the inlet end of the overflow valve 10 is communicated with the outlet end of the hydraulic pump 2, and the outlet end of the overflow valve 10 is communicated with the reservoir 1, so that when the oil supply pressure of the hydraulic pump 2 on the main pressure supply oil path is too high, the overflow valve 10 can be opened to protect the overload.
Referring to fig. 2, a safety valve 11 is further disposed on the main pressure supply line, and the safety valve 11 is disposed in parallel with the pressure reducing valve 8.
In the embodiment, a safety valve 11 is arranged in parallel at the pressure reducing valve 8 of the main pressure supply oil path, and if and only if the pressure reducing valve 8 fails and cannot release pressure (i.e. cannot release braking), the safety valve 11 normally works to release braking, so that the driving safety of the automobile is ensured. Wherein the safety valve 11 also adopts a normally closed electromagnetic valve.
The pressure of the accumulator 3 is greater than the maximum pressure required for braking by the electro-hydraulic brake mechanism 100.
In the present embodiment, when the hydraulic pump 2 is used to supplement pressure to the accumulator 3, it is required to ensure that the pressure of the accumulator 3 is greater than the maximum pressure required by the electronic hydraulic brake mechanism 100 for braking, because when the vehicle is parked and braked, the hydraulic pump 2 is turned off, the switch valve 4, the pressure increasing valve 5 and the pressure reducing valve 8 are all restored to the normal state, i.e., the switch valve 4 and the pressure increasing valve 5 are normally open, the pressure reducing valve 8 is normally closed, and the high-pressure accumulator 3 is used to provide pressure to the brake assembly 7 to complete the parking function of the vehicle, so it is required to ensure that the pressure of the accumulator 3 is greater than the maximum pressure required by the electronic hydraulic brake mechanism 100 for braking.
The auxiliary pressure supply oil path is also provided with a one-way valve 9, and the one-way valve 9 is arranged on the oil path between the hydraulic pump 2 and the energy accumulator 3.
In this embodiment, a check valve 9 is further disposed on the auxiliary pressure supply path, i.e., the path between the hydraulic pump 2 and the accumulator 3, to prevent the oil in the accumulator 3 from flowing back to the hydraulic pump 2 and causing damage to the hydraulic pump 2.
Example 2
Referring to fig. 3, the present embodiment provides an electronic hydraulic brake system, including the electronic hydraulic brake mechanism 100, further including a pedal simulation sensor 200 and a control module 300.
The electro-hydraulic brake mechanism 100 is used for being mounted at the wheel rim of a vehicle wheel and is used for completing braking of the vehicle wheel. Specifically, the number of the electrohydraulic brake mechanisms 100 is the same as the number of the wheels of the automobile, and the electrohydraulic brake mechanisms 100 are mounted at the wheel sides of the wheels of the automobile, and the electrohydraulic brake mechanisms 100 at the wheel sides of each wheel control the braking of the wheel.
The pedal analog sensor 200 serves to convert the pedal force into an electrical signal and transmit the electrical signal to the control module 300.
The control module 300 is electrically connected to the electro-hydraulic brake mechanism 100 and is configured to control the electro-hydraulic brake mechanism 100 to brake the vehicle wheels according to the received electrical signal. During specific work, the control module 300 sends the received signals to the electro-hydraulic brake mechanisms 100 on the wheel sides of each wheel respectively, and then the control unit of the electro-hydraulic brake mechanisms 100 controls each component in the electro-hydraulic brake mechanisms 100.
In practical application, the electronic hydraulic brake mechanisms 100 are arranged in a wheel-side integrated system, and a hydraulic integrated block model is adopted, wherein the switch valve 4 and the pressure increasing valve 5 are normally open solenoid valves, and the pressure reducing valve 8 is a normally closed solenoid valve, so that when the electronic hydraulic brake mechanisms are used, the control module 300 controls the electronic hydraulic brake mechanisms 100 respectively arranged at the wheel sides of four automobile wheels to brake the automobile wheels after receiving signals of the pedal simulation sensor 200. Specifically, as shown in fig. 6, when the vehicle starts to run normally, the control unit receives the brake release information of the control module 300, controls the switch valve 4 to close, opens the pressure reducing valve 8 for a period of time to close, when the vehicle needs to brake, the control unit receives the service brake information of the control module 300, controls the pressure reducing valve 8 to be in a closed state, and opens the hydraulic pump 2, the switch valve 4 and the accumulator 3, because the hydraulic pump 2 has a period of reaction time in the process of starting to work, the pressure at this time cannot be supplied in time, it is necessary to provide a pressure source for the brake assembly 7 through the work of the accumulator 3, the accumulator 3 can quickly react and eliminate the idle stroke and the brake gap of the piston, the brake response time is reduced, after the pressure of the hydraulic pump 2 is supplied, the accumulator 3 is closed, only the switch valve 4 needs to be closed, and the accumulator 3 can be closed, the hydraulic pump 2 works to boost, at the moment, the control unit judges the sizes of the actual brake pressure and the target brake pressure through pressure information on a main pressure supply oil way fed back by the pressure sensor 6, when the actual brake pressure is judged to be smaller than the target brake pressure, the hydraulic pump 2 continues to supply pressure, when the actual brake pressure is judged to be larger than the target brake pressure, the size of the brake pressure is controlled by adjusting the duty ratios of the booster valve 5 and the pressure reducing valve 8, when the actual brake pressure is judged to be equal to the target brake pressure, the duty ratios of the booster valve 5 and the pressure reducing valve 8 are kept unchanged, and service braking is completed. When the brake is released, the switch valve 4 and the pressure increasing valve 5 are closed, the pressure reducing valve 8 is opened for a period of time and then is closed, the hydraulic pump 2 continues to work to supplement pressure to the energy accumulator 3, when the pressure in the energy accumulator 3 reaches a certain value (the pressure of the energy accumulator 3 is ensured to be greater than the maximum pressure required by the brake), the hydraulic pump 2 is closed, and then the pressure increasing valve 5 is opened (namely, the normal state is recovered). When the vehicle is parked and braked, the control unit controls the hydraulic pump 2 to stop working after receiving the parking brake information sent by the control module 300, and controls the switch valve 4, the pressure increasing valve 5 and the pressure reducing valve 8 to be in a normal state (namely the switch valve 4 and the pressure increasing valve 5 are normally open, and the pressure reducing valve 8 is normally closed) when the power is off, and at the moment, the high-pressure accumulator 3 provides pressure to complete the parking brake function of the vehicle. The electronic hydraulic brake mechanism 100 can still provide brake pressure by the high-pressure energy accumulator 3 after the vehicle stops, and has the functions of service braking and parking braking.
Example 3
Referring to fig. 4, the present embodiment provides an electronic hydraulic brake control method, which employs the electronic hydraulic brake mechanism 100, and includes the following steps:
step 1: receives a signal from the pedal simulation sensor 200.
Step 2: and controlling the electronic hydraulic brake mechanism 100 to brake the wheels of the automobile according to the received signal of the pedal simulation sensor 200.
Specifically, referring to fig. 5, the method for controlling the electronic hydraulic brake mechanism 100 to brake the vehicle wheels according to the received signal of the pedal analog sensor 200 includes:
step 21: the electronic hydraulic brake mechanism 100 is controlled in accordance with the received signal from the pedal simulation sensor 200 to select a brake pressure mode, which includes a pressure-increasing mode, a pressure-maintaining mode, and a pressure-decreasing mode.
Step 22: and braking the automobile wheels according to the selected brake pressure mode.
In practical application, the electronic hydraulic brake mechanism 100 is arranged in a wheel-side integrated system, and a hydraulic integrated block model is adopted, wherein the switch valve 4 and the pressure increasing valve 5 are normally open solenoid valves, and the pressure reducing valve 8 is a normally closed solenoid valve, when in use, the control module 300 controls the electronic hydraulic brake mechanism 100 respectively arranged at the wheel sides of four automobile wheels (namely, a left front wheel, a left rear wheel, a right front wheel and a right rear wheel) to brake the automobile wheels after receiving signals of the pedal analog sensor 200, and the electronic hydraulic brake mechanism is independently arranged in the wheel-side integrated system, so that the independent braking of a single wheel can be completed, the modularization and mass production development of the wheel-side integrated system of the vehicle are facilitated, and when one of the four automobile wheels breaks down, the braking of the vehicle can be still completed, and the electronic hydraulic brake mechanism has a redundant braking function.
Specifically, as shown in fig. 6, when the vehicle starts to run normally, the control unit receives the brake release information of the control module 300, controls the switch valve 4 to close, opens the pressure reducing valve 8 for a period of time to close, when the vehicle needs to brake, the control unit receives the service brake information of the control module 300, controls the pressure reducing valve 8 to be in a closed state, and opens the hydraulic pump 2, the switch valve 4 and the accumulator 3, because the hydraulic pump 2 has a period of reaction time in the process of starting to work, the pressure at this time cannot be supplied in time, it is necessary to provide a pressure source for the brake assembly 7 through the work of the accumulator 3, the accumulator 3 can quickly react and eliminate the idle stroke and the brake gap of the piston, the brake response time is reduced, after the pressure of the hydraulic pump 2 is supplied, the accumulator 3 is closed, only the switch valve 4 needs to be closed, and the accumulator 3 can be closed, the hydraulic pump 2 works to boost, at the moment, the control unit judges the sizes of the actual brake pressure and the target brake pressure through pressure information on a main pressure supply oil way fed back by the pressure sensor 6, when the actual brake pressure is judged to be smaller than the target brake pressure, the hydraulic pump 2 continues to supply pressure, when the actual brake pressure is judged to be larger than the target brake pressure, the size of the brake pressure is controlled by adjusting the duty ratios of the booster valve 5 and the pressure reducing valve 8, when the actual brake pressure is judged to be equal to the target brake pressure, the duty ratios of the booster valve 5 and the pressure reducing valve 8 are kept unchanged, and service braking is completed. When the brake is released, the switch valve 4 and the pressure increasing valve 5 are closed, the pressure reducing valve 8 is opened for a period of time and then closed, the hydraulic pump 2 continues to work to supplement pressure to the energy accumulator 3, when the pressure in the energy accumulator 3 reaches a certain value (the pressure of the energy accumulator 3 is ensured to be larger than the maximum pressure required by the brake), the hydraulic pump 2 is closed, and then the pressure increasing valve 5 is opened (namely, the normal state is recovered). When the vehicle is parked and braked, the control unit controls the hydraulic pump 2 to stop working after receiving the parking brake information sent by the control module 300, and controls the switch valve 4, the pressure increasing valve 5 and the pressure reducing valve 8 to be in a normal state (namely the switch valve 4 and the pressure increasing valve 5 are normally open, and the pressure reducing valve 8 is normally closed) when the power is off, and at the moment, the high-pressure accumulator 3 provides pressure to complete the parking brake function of the vehicle. The electronic hydraulic brake mechanism 100 can still provide brake pressure by the high-pressure energy accumulator 3 after the vehicle stops, and has the functions of service braking and parking braking.
In practical application, when the brake pressure mode selected by the control module 300 is a boosting mode, the electronic hydraulic brake mechanism 100 is controlled to brake the vehicle; when the brake pressure mode selected by the control module 300 is the pressure maintaining mode, the electronic hydraulic brake mechanism 100 is controlled to perform parking brake, emergency brake or service brake on the vehicle; when the brake pressure mode selected by the control module 300 is a decompression mode, the electro-hydraulic brake mechanism 100 is controlled to release braking of the vehicle.
Specifically, as shown in fig. 1, a hydraulic pump 2 and an accumulator 3 jointly provide a pressure source, the accumulator 3 is connected in parallel to a main oil line, and is mainly used for quickly eliminating piston idle stroke and brake clearance, then the hydraulic pump 2 works to boost pressure, and the pressure change in the braking process is controlled by adjusting a pressure increasing valve 5 and a pressure reducing valve 8, and the pressure change mainly has three modes, and the specific pressure change process principle is as follows:
when the vehicle needs to be braked, the active boosting mode is used: the pressure reducing valve 8 is closed, the switch valve 4 and the pressure increasing valve 5 are opened, the switch valve 4 is closed after the idle stroke and the braking clearance of the piston are rapidly eliminated through the work of the energy accumulator 3, then the braking component 7 is pressurized through the work of the hydraulic pump 2, and then the braking component 7 acts on the automobile wheels, so that the service braking of the automobile is realized. Wherein, in the process of active pressurization, one or more pulse signals are given to the switch valve 4, and the switch valve 4 is closed after the switch valve 4 is opened for one or more pulse signals.
When the vehicle needs parking braking or emergency braking, the pressure maintaining mode is used: the switch valve 4, the pressure increasing valve 5 and the pressure reducing valve 8 are powered off and restored to the normal state (namely, the switch valve 4 is normally opened, the pressure increasing valve 5 is normally opened and the pressure reducing valve 8 is normally closed), and then the accumulator 3 supplies pressure to the brake assembly 7 to complete the parking function or emergency braking of the vehicle. It should be noted that the specific case of using the pressure maintaining mode during the braking of the vehicle is as follows: when the vehicle runs on a long downhill, the vehicle is in a braking state for a long time, and the vehicle runs all the time with braking force, and the service braking can be carried out by using the pressure maintaining mode.
When the vehicle needs to be braked, the decompression mode is used: and closing the switch valve 4 and the pressure increasing valve 5, opening the pressure reducing valve 8, continuously working the hydraulic pump 2 to supplement pressure to the energy accumulator 3, stopping the hydraulic pump 2 after a certain pressure is reached, and stopping the braking of the automobile wheels by the braking component 7 to realize the braking release of the automobile, wherein the pressure acting on the braking component 7 has no pressure source.
It is to be noted that, in the above embodiment, both the pressure increasing valve 5 and the pressure reducing valve 8 are high-speed electromagnetic valves controlled by PWM.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. Numerous simple deductions, modifications or substitutions may also be made by those skilled in the art in light of the present teachings.

Claims (10)

1. An electronic hydraulic brake mechanism is characterized by comprising a brake assembly, a control unit, a main pressure supply oil way and an auxiliary pressure supply oil way which is connected with the main pressure supply oil way in parallel;
the main pressure supply oil way is provided with a liquid storage device, a hydraulic pump, a pressure increasing valve, a pressure reducing valve and a pressure sensor, the inlet end of the hydraulic pump is communicated with the liquid storage device, and the outlet end of the hydraulic pump is communicated with the inlet end of the pressure increasing valve; the outlet end of the pressure increasing valve is communicated with the brake assembly; the inlet end of the pressure reducing valve is communicated with the outlet end of the pressure increasing valve, and the outlet end of the pressure reducing valve is communicated with the liquid storage device; the pressure sensor is arranged on an oil path between the pressure increasing valve and the brake assembly;
the auxiliary pressure supply oil way is provided with an energy accumulator and a switch valve, the inlet end of the energy accumulator is communicated with the outlet end of the hydraulic pump, and the outlet end of the energy accumulator is communicated with the inlet end of the pressure increasing valve through the switch valve;
the control unit is respectively and electrically connected with the hydraulic pump, the pressure increasing valve, the pressure reducing valve, the pressure sensor, the energy accumulator and the switch valve and is used for controlling the main pressure supply oil way and the auxiliary pressure supply oil way to supply pressure to the brake assembly so as to realize braking of the automobile wheels.
2. The electro-hydraulic brake mechanism of claim 1, further comprising an overflow valve disposed in the main supply pressure path, an inlet end of the overflow valve being in communication with an outlet end of the hydraulic pump, an outlet end of the overflow valve being in communication with the reservoir.
3. The electro-hydraulic brake mechanism of claim 1, further including a relief valve disposed on the main supply pressure line, the relief valve being disposed in parallel with the relief valve.
4. The electro-hydraulic brake mechanism of claim 1, wherein the pressure of the accumulator is greater than a maximum pressure required for braking of the electro-hydraulic brake mechanism.
5. The electro-hydraulic brake mechanism of claim 1, wherein the on-off valve and the pressure increasing valve are normally open solenoid valves, and the pressure reducing valve is a normally closed solenoid valve.
6. The electro-hydraulic brake mechanism of claim 1, wherein a check valve is further provided on the auxiliary pressure supply oil path, the check valve being provided on the oil path between the hydraulic pump and the accumulator.
7. An electro-hydraulic brake system, comprising an electro-hydraulic brake mechanism according to any one of claims 1-6, a pedal emulation sensor, and a control module;
the electronic hydraulic brake mechanism is arranged at the wheel edge of the automobile wheel and used for completing the braking of the automobile wheel;
the pedal simulation sensor is used for converting pedal force into an electric signal and sending the electric signal to the control module;
the control module is electrically connected with the electronic hydraulic braking mechanism and used for controlling the electronic hydraulic braking mechanism to brake the automobile wheels according to the received electric signals.
8. An electro-hydraulic brake control method characterized by employing the electro-hydraulic brake mechanism of claims 1-6, comprising the steps of:
receiving signals of a pedal simulation sensor;
and controlling the electronic hydraulic brake mechanism to brake the automobile wheels according to the received signals of the pedal simulation sensor.
9. The electro-hydraulic brake control method of claim 8, wherein the controlling the electro-hydraulic brake mechanism to brake the wheels of the vehicle according to the received signal of the pedal simulation sensor includes:
controlling the electronic hydraulic brake mechanism to select a brake pressure mode according to the received signal of the pedal simulation sensor, wherein the brake pressure mode comprises a pressure boost mode, a pressure maintaining mode and a pressure reduction mode;
and braking the automobile wheels according to the selected brake pressure mode.
10. The electro-hydraulic brake control method of claim 9,
when the selected brake pressure mode is a pressurization mode, controlling the electronic hydraulic brake mechanism to brake the vehicle in a service mode;
when the selected brake pressure mode is a pressure maintaining mode, controlling the electronic hydraulic brake mechanism to perform parking brake, emergency brake or service brake on the vehicle;
and when the selected brake pressure mode is a decompression mode, controlling the electronic hydraulic brake mechanism to release the brake of the vehicle.
CN202210713330.XA 2022-06-22 2022-06-22 Electro-hydraulic braking mechanism, system and electro-hydraulic braking control method Active CN114954400B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210713330.XA CN114954400B (en) 2022-06-22 2022-06-22 Electro-hydraulic braking mechanism, system and electro-hydraulic braking control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210713330.XA CN114954400B (en) 2022-06-22 2022-06-22 Electro-hydraulic braking mechanism, system and electro-hydraulic braking control method

Publications (2)

Publication Number Publication Date
CN114954400A true CN114954400A (en) 2022-08-30
CN114954400B CN114954400B (en) 2023-09-19

Family

ID=82966542

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210713330.XA Active CN114954400B (en) 2022-06-22 2022-06-22 Electro-hydraulic braking mechanism, system and electro-hydraulic braking control method

Country Status (1)

Country Link
CN (1) CN114954400B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0717376A (en) * 1993-06-30 1995-01-20 Mitsubishi Motors Corp Branking device for vehicle
CN103863286A (en) * 2012-12-14 2014-06-18 株式会社电装 Hydraulic braking system
CN104442777A (en) * 2014-11-27 2015-03-25 江苏理工学院 Chassis wheel edge distributed independent brake actuating mechanism and chassis brake system
CN106314404A (en) * 2016-06-14 2017-01-11 芜湖伯特利汽车安全系统股份有限公司 Brake by wire system with hydraulic power and control method of brake by wire system
CN106515698A (en) * 2016-10-28 2017-03-22 江苏理工学院 Automobile decoupling distributed brake system electric-hydraulic combined braking execution mechanism
CN108501921A (en) * 2018-05-04 2018-09-07 吉林大学 A kind of hydraulic pressure line control brake system and its brake control method with double pressure sources

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0717376A (en) * 1993-06-30 1995-01-20 Mitsubishi Motors Corp Branking device for vehicle
CN103863286A (en) * 2012-12-14 2014-06-18 株式会社电装 Hydraulic braking system
CN104442777A (en) * 2014-11-27 2015-03-25 江苏理工学院 Chassis wheel edge distributed independent brake actuating mechanism and chassis brake system
CN106314404A (en) * 2016-06-14 2017-01-11 芜湖伯特利汽车安全系统股份有限公司 Brake by wire system with hydraulic power and control method of brake by wire system
CN106515698A (en) * 2016-10-28 2017-03-22 江苏理工学院 Automobile decoupling distributed brake system electric-hydraulic combined braking execution mechanism
CN108501921A (en) * 2018-05-04 2018-09-07 吉林大学 A kind of hydraulic pressure line control brake system and its brake control method with double pressure sources

Also Published As

Publication number Publication date
CN114954400B (en) 2023-09-19

Similar Documents

Publication Publication Date Title
JP3396694B2 (en) Brake equipment
CN103180188B (en) For running method and the control equipment of the brakes being furnished with electric driver and/or rotor machine
JP2020525336A (en) Brake system
CN107444365B (en) Electronic line control brake system
KR20110036109A (en) Brake system for motor vehicles
US20100089054A1 (en) Adaptive free-travel reduction
CN111348020A (en) Simple and reliable electronic hydraulic braking system and method and vehicle
CN111284465A (en) Braking system suitable for automatic driving and control method
CN104859625A (en) Vehicle integrated electro-hydraulic brake (EHB) system
CN111322328B (en) Pump control cylinder hydraulic system for brake system actuation control
CN110696798A (en) Electronic hydraulic braking system and method applied to large-tonnage vehicle and large-tonnage vehicle
CN113561954B (en) Hydraulic control unit for a brake system in a motor vehicle, brake system and control method
CN113002508A (en) Dual-motor redundant braking system with integrated pressure regulating unit and control method
CN112606808A (en) Brake device with electronic brake booster
EP4101710B1 (en) Brake system, brake method and vehicle
CN111267809B (en) Heavy transport vehicle distributed liquid-gas braking system and control method
CN114954400B (en) Electro-hydraulic braking mechanism, system and electro-hydraulic braking control method
CN111873969B (en) Electronic hydraulic line control brake system with independent double loops
CN214607468U (en) Braking assistance system
CN213502250U (en) Hydraulic braking system
CN211308527U (en) Simple and reliable electronic hydraulic braking system and vehicle
CN113002510A (en) Hybrid braking system
CN112874492A (en) Brake boosting system and control method thereof
CN220764349U (en) Automobile line control braking system
CN215436375U (en) Dual-motor redundant brake system with integrated pressure regulating unit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant