CN113665540B - Brake-by-wire system, control method, storage medium, and terminal - Google Patents

Brake-by-wire system, control method, storage medium, and terminal Download PDF

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Publication number
CN113665540B
CN113665540B CN202111010684.XA CN202111010684A CN113665540B CN 113665540 B CN113665540 B CN 113665540B CN 202111010684 A CN202111010684 A CN 202111010684A CN 113665540 B CN113665540 B CN 113665540B
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cylinder
brake
pressure
isolation valve
cavity
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CN113665540A (en
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刘宏伟
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China Automotive Innovation Co Ltd
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China Automotive Innovation Co Ltd
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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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
    • 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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/404—Brake-by-wire or X-by-wire failsafe
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/82—Brake-by-Wire, EHB

Abstract

The invention discloses a line control actuating system, a control method, a storage medium and a terminal, comprising a first pressure cylinder and a second pressure cylinder; the first pressure cylinder is arranged between the first isolation valve and the third isolation valve, a first cavity of the first pressure cylinder is communicated with an output circuit of the third isolation valve, a second cavity of the first pressure cylinder is communicated with an input circuit of the first isolation valve, and the first pressure cylinder is arranged to pressurize the braking pressure of the first cavity of the brake main cylinder when the first pressure cylinder enters a mechanical backup state; the second chamber of the second booster cylinder is communicated with the input circuit of the second isolation valve, and the second booster cylinder is set to boost the brake pressure of the second chamber of the master cylinder when entering a mechanical backup state, so that the pedal stroke is increased and the pedal force is reduced. The invention improves the travel of the brake pedal during mechanical backup braking, and avoids the panic of 'no pedal stepping' caused by the shortened travel of the pedal of a driver in an emergency.

Description

Brake-by-wire system, control method, storage medium, and terminal
Technical Field
The invention relates to the technical field of vehicle brake-by-wire, in particular to a brake-by-wire control system, a control method, a storage medium and a terminal.
Background
Referring to fig. 1, in the conventional technology, when a brake-by-wire system encounters a serious electrical fault, the brake-by-wire system enters a purely mechanical backup state, at this time, a simulator control valve closes and cuts off a first cavity of a brake master cylinder and a pedal simulator cylinder, and meanwhile, an isolation valve 3 and an isolation valve 4 open, and an isolation valve 1 and an isolation valve 2 close, so that the first cavity of the brake master cylinder 1 is communicated with a brake wheel cylinder 1 and the brake wheel cylinder 3, and the second cavity of the brake master cylinder 2 is communicated with the brake wheel cylinder 2 and the brake wheel cylinder 4, at this time, brake pressure cannot be directly provided by a pressure source by wire, a driver pedal force is linearly and positively correlated with a wheel cylinder pressure, a large pedal force needs to be provided to directly provide braking force required by the wheel cylinders, and due to small compressibility of oil, a pedal stroke is significantly shortened, and subjective feeling of foot feeling of a driver is fed back to be hard and is difficult to step on, which is easy to cause panic of the driver.
When the brake-by-wire system encounters serious electrical faults, the driver needs to provide a brake pedal force which is several times that of normal braking so as to provide enough brake wheel cylinder pressure; when the conventional brake-by-wire system is in a mechanical backup working condition, the pressure of a brake wheel cylinder is directly provided by a brake master cylinder, and the pedal stroke is obviously shortened due to small compressibility of oil, so that the subjective feeling of a driver, such as hardening of foot feeling and difficulty in stepping down, is fed back to the driver, and the driver is easy to panic.
Disclosure of Invention
The invention aims to provide a line control hydraulic system, a control method, a storage medium and a terminal, which simulate the pedal feeling of a driver by improving a line control hydraulic loop system and solve the technical problems that the pedal stroke is obviously shortened and the subjective feeling of the driver, such as hardening of the foot feeling and difficulty in stepping down, is fed back to the driver under the mechanical backup working condition.
In order to solve the technical problem, a first aspect of the present invention provides a brake-by-wire system, which includes a brake pedal, a master cylinder, a simulator control valve, a simulator cylinder, a first wheel cylinder, a second wheel cylinder, a third wheel cylinder, a fourth wheel cylinder, a first isolation valve, a second isolation valve, a third isolation valve, and a fourth isolation valve; the device also comprises a first pressure cylinder and a second pressure cylinder;
the first pressure cylinder is arranged between the first isolation valve and the third isolation valve, a first cavity of the first pressure cylinder is communicated with an output circuit of the third isolation valve, a second cavity of the first pressure cylinder is communicated with an input circuit of the first isolation valve, the first pressure cylinder is arranged to pressurize the braking pressure of the first cavity of the brake main cylinder when entering a mechanical backup state so as to increase the pedal stroke and reduce the pedal force, the first cavity of the first pressure cylinder is a rodless cavity, and the second cavity of the first pressure cylinder is a rod cavity;
the second pressure cylinder is arranged between a second isolation valve and a fourth isolation valve, a first cavity of the second pressure cylinder is communicated with an output circuit of the fourth isolation valve, a second cavity of the second pressure cylinder is communicated with an input circuit of the second isolation valve, the second pressure cylinder is arranged to pressurize the braking pressure of a second cavity of the brake main cylinder when the second pressure cylinder enters a mechanical backup state, so that the pedal stroke is increased and the pedal force is reduced, the first cavity of the second pressure cylinder is a rodless cavity, and the second cavity of the second pressure cylinder is a rod cavity.
In some possible embodiments, the system further comprises a pressure-by-wire source disposed between the first isolation valve and the second isolation valve, the pressure-by-wire source configured to provide hydraulic pressure to the first and third brake cylinders through the first isolation valve and hydraulic pressure to the second and fourth brake cylinders through the second isolation valve.
In some possible embodiments, the simulator control valve is disposed between the master cylinder first chamber and the simulator cylinder, the simulator control valve being for controlling communication or disconnection between the simulator cylinder and the master cylinder.
In some possible embodiments, the simulator control valve is a normally closed valve.
A second aspect of the present invention provides a control method for a brake-by-wire system, which is applied to the brake-by-wire system described above, and includes:
in response to a request for a mechanical backup state, the third isolation valve is controlled to open to communicate the master cylinder first chamber and the first and third wheel cylinders, and the fourth isolation valve is controlled to open to communicate the master cylinder second chamber and the second and fourth wheel cylinders.
In some possible embodiments, the method further comprises,
in response to a request for a mechanical back-up state, the simulator control valve is controlled to close to cut off communication between the master cylinder first chamber and the simulator cylinder, and the first isolation valve and the second isolation valve are controlled to close to cut off communication between the by-wire pressure source and the first brake wheel cylinder and the second brake wheel cylinder.
In some possible embodiments, the method further comprises,
and in response to a pedal input signal input by a brake pedal, controlling the simulator control valve to open, so that the brake master cylinder first cavity is communicated with the simulator cylinder, and closing the third isolation valve and the fourth isolation valve.
In some possible embodiments, the method further comprises,
converting the pedal input signal to a braking force target demand;
and controlling the first isolation valve and the second isolation valve to be opened according to the braking force target demand, so that the pressure source by wire is equal to the pressure of the first brake wheel cylinder, the second brake wheel cylinder, the third brake wheel cylinder and the fourth brake wheel cylinder.
The present invention also provides a storage medium having stored thereon a computer program which, when executed by a processor, implements a control method of a brake-by-wire system as described above.
The invention also provides a terminal comprising one or more processors and memory. A memory coupled to the processor for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the control method of the brake-by-wire system as described above.
The implementation of the invention has the following beneficial effects:
according to the method, a line control hydraulic circuit system is improved, two pressure cylinders are added, pedal force is reduced, pedal travel is increased, pedal feeling of a driver can be simulated under a mechanical backup working condition, the pedal travel during mechanical backup braking is improved, subjective braking feeling during emergency mechanical backup braking of the driver is improved, and the panic that the pedal cannot be stepped on due to pedal travel shortening of the driver is avoided.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a brake-by-wire system of the prior art;
FIG. 2 is a schematic structural view of the brake-by-wire system of the present invention;
FIG. 3 is a schematic view of the construction of the booster cylinder of the present invention;
FIG. 4 is a flow chart schematic of a control method of the brake-by-wire system of the present invention;
fig. 5 is a schematic structural diagram of a computer terminal device according to an embodiment of the present invention.
Wherein the reference numerals in the figures correspond to: 1. a brake pedal; 2. a brake master cylinder; 21. a brake master cylinder first cavity; 22. a brake master cylinder second chamber; 3. a simulator control valve; 4. a simulator cylinder; 5. a first brake wheel cylinder; 6. a second brake cylinder; 7. a third brake wheel cylinder; 8. a fourth brake cylinder; 9. a first isolation valve; 10. a second isolation valve; 11. a third isolation valve; 12. a fourth isolation valve; 13. a first booster cylinder; 14. a second booster cylinder; 15. a line control pressure source 111, a cylinder; 112. a piston; 113. a piston rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
As shown in fig. 2, the invention discloses a line control brake system, which comprises a brake pedal 1, a brake master cylinder 2, a simulator control valve 3, a simulator cylinder 4, a first brake cylinder 5, a second brake cylinder 6, a third brake cylinder 7, a fourth brake cylinder 8, a first isolation valve 9, a second isolation valve 10, a third isolation valve 11 and a fourth isolation valve 12; a first pressurizing cylinder 13 and a second pressurizing cylinder 14;
the first pressure cylinder 13 is arranged between the first isolation valve 9 and the third isolation valve 11, a first cavity of the first pressure cylinder 13 is communicated with an output circuit of the third isolation valve 11, a second cavity of the first pressure cylinder 13 is communicated with an input circuit of the first isolation valve 9, the first pressure cylinder 13 is arranged to pressurize the braking pressure of the first cavity 21 of the brake main cylinder when entering a mechanical backup state so as to increase the pedal stroke and reduce the pedal force, the first cavity of the first pressure cylinder 13 is a rodless cavity, and the second cavity of the first pressure cylinder 13 is a rod cavity;
the second pressure cylinder 14 is arranged between the second isolation valve 10 and the fourth isolation valve 12, a first cavity of the second pressure cylinder 14 is communicated with an output circuit of the fourth isolation valve 12, a second cavity of the second pressure cylinder 14 is communicated with an input circuit of the second isolation valve 10, the second pressure cylinder 14 is arranged to pressurize the brake pressure of the second cavity 22 of the brake master cylinder when entering a mechanical backup state, so that the pedal stroke is increased and the pedal force is reduced, the first cavity of the second pressure cylinder 14 is a rodless cavity, and the second cavity of the second pressure cylinder 14 is a rod cavity.
Specifically, in the online control brake system, a brake pedal 1 is connected with a brake master cylinder 2, the brake master cylinder 2 comprises a brake master cylinder first cavity 21, a brake master cylinder second cavity 22, a first cavity spring and a second cavity spring, the brake master cylinder first cavity 21 is connected with the brake master cylinder second cavity 22 through the first cavity spring, and the other side of the brake master cylinder second cavity 22 is connected with the second cavity spring; one branch connected with the first cavity 21 of the brake master cylinder comprises a simulator control valve 3 and a simulator cylinder 4, and the first cavity 21 of the brake master cylinder is connected with the simulator cylinder 4 through the simulator control valve 3; the other branch connected with the first cavity 21 of the brake master cylinder is sequentially provided with a third isolation valve 11, a first pressure increasing cylinder 13 and a first brake wheel cylinder 5, the third brake wheel cylinder 7 is connected with the first pressure increasing cylinder 13, and the first brake wheel cylinder 5 and the third brake wheel cylinder 7 are connected in parallel; a branch connected with the second cavity 22 of the brake master cylinder is sequentially provided with a fourth isolation valve 12, a second pressure increasing cylinder 14 and a second brake wheel cylinder 6, a fourth brake wheel cylinder 8 is connected with the second pressure increasing cylinder 14, and the second brake wheel cylinder 6 is connected with the fourth brake wheel cylinder 8 in parallel; the first pressure cylinder 13 and the second pressure cylinder 14 are connected, and a first isolation valve 9, a line-controlled pressure source 15, and a second isolation valve 10 are provided once on a branch from the first pressure cylinder 13 to the second pressure cylinder 14.
When the brake-by-wire system encounters serious electrical fault, the brake-by-wire system enters a mechanical backup state, at the moment, the brake-by-wire system controls the simulator control valve 3 to be closed so as to cut off the line communication between the brake master cylinder first cavity 21 and the simulator cylinder 4, controls the third isolation valve 11 and the fourth isolation valve 12 to be opened, closes the first isolation valve 9 and the second isolation valve 10 so that the brake master cylinder first cavity 21 is communicated with the first cavity of the first pressure cylinder 13, and after the brake pressure of the brake master cylinder first cavity 21 is boosted by the first pressure cylinder 13, the brake pressure is communicated with the first brake wheel cylinder 5 and the third brake wheel cylinder 7 by the second cavity of the first pressure cylinder 13; the second cavity 22 of the brake master cylinder is communicated with the first cavity of the second pressure cylinder 14, the brake pressure of the second cavity 22 of the brake master cylinder is boosted through the second pressure cylinder 14 and then communicated with the second brake wheel cylinder 6 and the fourth brake wheel cylinder 8 through the second cavity of the second pressure cylinder 14, and the subjective brake feeling of a driver during emergency mechanical backup braking is improved through the pedal force reduction and pedal stroke increase effects of the two pressure cylinders.
The first pressure cylinder 13 and the second pressure cylinder 14 are structured as shown in fig. 3, and include a cylinder body 111, a piston 112 and a piston rod 113, the diameter of the cylinder body is D, the diameter of the piston rod is D, the target of the pressure of the brake wheel cylinder is Pw, the loop pressure of the brake master cylinder is Pc, the piston action area of the brake master cylinder is Sc, the brake pedal force Fp, the brake pedal lever ratio is k, the brake pedal stroke is Lp, and the liquid demand of the target of the pressure of the brake wheel cylinder Pw is Vw; according to the force balance principle, the formula of the brake master cylinder circuit pressure is as follows:
Figure GDA0003631402090000051
the calculation formula of the brake pedal force is as follows:
Figure GDA0003631402090000052
the calculation formula of the brake pedal stroke is as follows:
Figure GDA0003631402090000053
from the above derivation, it can be realized by designing reasonable D, d size values: the brake pedal force is obviously reduced under the same target value of the brake wheel cylinder pressure, the brake pedal displacement can be increased, the pedal force of a driver is reduced, the pedal stroke is increased, and the subjective feelings of the driver such as hardening and non-stepping of the pedal are obviously reduced.
In one embodiment, the system further comprises a pressure-by-wire source 15, the pressure-by-wire source 15 is arranged between the first isolation valve 9 and the second isolation valve 10, and the pressure-by-wire source 15 is arranged to provide hydraulic pressure to the first brake wheel cylinder 5 and the third brake wheel cylinder 7 through the first isolation valve 9 and provide hydraulic pressure to the second brake wheel cylinder 6 and the fourth brake wheel cylinder 8 through the second isolation valve 10.
After the first isolation valve 9 and the second isolation valve 10 are opened, hydraulic pressure provided by the line-control pressure source 15 enters the first brake wheel cylinder 5, the third brake wheel cylinder 7, the second brake wheel cylinder 6 and the fourth brake wheel cylinder 8 through the first isolation valve 9 and the second isolation valve 10 respectively, so that the pressure of the four wheel cylinders is finally equal to the pressure of the line-control pressure source 15, and the braking request of a driver is realized. Because the brake pressure is provided directly by the pressure source by wire 15, the driver need only provide a small pedal force to overcome the resistance of the simulator cylinder 4 to achieve the desired brake force output.
In one embodiment, the simulator control valve 3 is disposed between the master cylinder first chamber 21 and the simulator cylinder 4, and the simulator control valve 3 is used to control communication or disconnection between the simulator cylinder 4 and the master cylinder 2.
In one embodiment, the simulator control valve 3 is a normally closed valve.
The simulator control valve 3 is a normally closed valve, when a driver treads or releases the brake pedal 1, the brake-by-wire system controls the simulator control valve 3 to be electrified, the simulator control valve 3 is opened, the brake master cylinder 2 is communicated with the simulator cylinder 4, oil in the brake master cylinder 2 smoothly enters the pedal simulator along with pedal force input, and the set pedal force characteristic simulation is completed.
Referring to fig. 4, a second aspect of the present invention provides a method for controlling a brake-by-wire system, applied to the brake-by-wire system, including:
and S101, in response to the request of the mechanical backup state, controlling the third isolation valve 11 to be opened so as to communicate the master cylinder first cavity 21 and the first brake cylinder 5 with the third brake cylinder 7, and controlling the fourth isolation valve 12 to be opened so as to communicate the master cylinder second cavity 22 and the second brake cylinder 6 with the fourth brake cylinder 8.
Under the condition of mechanical backup, when the brake-by-wire system encounters serious electrical fault, sending a request of a mechanical backup state, entering a pure mechanical backup state, controlling the third isolation valve 11 and the fourth isolation valve 12 to be opened, and controlling the first isolation valve 9 and the second isolation valve 10 to be closed, so that the first cavity 21 of the brake main cylinder is communicated with the first cavity of the first pressure cylinder 13, and after the brake pressure of the first cavity 21 of the brake main cylinder is pressurized by the first pressure cylinder 13, the brake pressure is communicated with the first brake wheel cylinder 5 and the third brake wheel cylinder 7 by the second cavity of the first pressure cylinder 13; the second cavity 22 of the brake master cylinder is communicated with the first cavity of the second pressure cylinder 14, the brake pressure of the second cavity 22 of the brake master cylinder is boosted through the second pressure cylinder 14 and then communicated with the second brake wheel cylinder 6 and the fourth brake wheel cylinder 8 through the second cavity of the second pressure cylinder 14, and the subjective brake feeling of a driver during emergency mechanical backup braking is improved through the pedal force reduction and pedal stroke increase effects of the two pressure cylinders.
In one embodiment, the method further comprises,
in response to a request for a mechanical back-up state, the simulator control valve 3 is controlled to close to cut off communication between the master cylinder first chamber 21 and the simulator cylinder 4, and the first isolation valve 9 and the second isolation valve 10 are controlled to close to cut off communication between the pressure-by-wire source 15 and the first and second brake cylinders 5 and 6.
Under the condition of mechanical backup, when the brake-by-wire system encounters serious electrical fault, the brake-by-wire system sends a request of a mechanical backup state, enters a pure mechanical backup state, and at the moment, controls the simulator control valve 3 to be closed, and cuts off the communication between the brake master cylinder first cavity 21 and the pedal simulator cylinder 4.
In one embodiment, the method further comprises,
in response to a pedal input signal input from the brake pedal 1, the simulator control valve 3 is controlled to open, so that the master cylinder first chamber 21 communicates with the simulator cylinder 4, and the third and fourth isolation valves 11 and 12 are closed.
Under the condition of conventional braking, a driver inputs a braking request by stepping on a brake pedal 1, the brake-by-wire system controls a simulator control valve 3 to be opened according to the braking request, and controls a third isolation valve 11 and a fourth isolation valve 12 to be closed, so that a first cavity 21 of a brake main cylinder is communicated with a simulator cylinder 4, oil liquid of the brake main cylinder 2 smoothly enters a pedal simulator along with pedal force input, and the set pedal force characteristic simulation is completed.
In one embodiment, the method further comprises,
converting the pedal input signal to a braking force target demand;
according to the braking force target demand, the first isolation valve 9 and the second isolation valve 10 are controlled to be opened, so that the pressure source-by-wire 15 is equal to the pressure of the first brake wheel cylinder 5, the second brake wheel cylinder 6, the third brake wheel cylinder 7 and the fourth brake wheel cylinder 8.
Under the condition of conventional braking, a driver inputs a braking request by stepping on a brake pedal 1, the brake-by-wire system controls a simulator control valve 3 to be opened according to the braking request, and controls a third isolation valve 11 and a fourth isolation valve 12 to be closed, so that a first cavity 21 of a brake main cylinder is communicated with a simulator cylinder 4, oil liquid of the brake main cylinder 2 smoothly enters a pedal simulator along with pedal force input, and the set pedal force characteristic simulation is completed. Meanwhile, the brake-by-wire system converts the received pedal input signal into a target braking force demand, controls the first isolation valve 9 and the second isolation valve 10 to be opened, and provides hydraulic pressure by the pressure source-by-wire 15, and the pressure source-by-wire 15 enters the first brake wheel cylinder 5, the third brake wheel cylinder 7, the second brake wheel cylinder 6 and the fourth brake wheel cylinder 8 through the first isolation valve 9 and the second isolation valve 10 at the moment, so that the pressures of the four brake wheel cylinders are finally equal to the pressure of the pressure source-by-wire 15, and the braking request of a driver is realized. Because the brake pressure is provided directly by the pressure source by wire 15, the driver need only provide a small pedal force to overcome the resistance of the simulator cylinder 4 to achieve the desired brake force output.
Referring to fig. 5, a terminal according to an embodiment of the present invention includes one or more processors and a memory. A memory is coupled to the processor for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement a method of controlling a brake-by-wire system as in any one of the embodiments described above.
The processor is used for controlling the overall operation of the computer terminal equipment so as to complete all or part of the steps of the control method of the brake-by-wire system. The memory is used to store various types of data to support the operation at the computer terminal device, which data may include, for example, instructions for any application or method operating on the computer terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.
In an exemplary embodiment, the computer terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor or other electronic components, and is configured to perform the control method of the brake-by-wire system, and achieve the technical effects consistent with the above-mentioned methods.
In another exemplary embodiment, there is also provided a storage medium comprising program instructions which, when executed by a processor, implement the steps of the control method of the brake-by-wire system in any one of the above embodiments. For example, the storage medium may be the memory including the program instructions, and the program instructions may be executed by the processor of the terminal to implement the control method of the brake-by-wire system, and achieve the technical effects consistent with the above method.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. A line control brake system comprises a brake pedal, a brake master cylinder, a simulator control valve, a simulator cylinder, a first brake cylinder, a second brake cylinder, a third brake cylinder, a fourth brake cylinder, a first isolation valve, a second isolation valve, a third isolation valve and a fourth isolation valve; the device is characterized by also comprising a first pressure cylinder and a second pressure cylinder;
the first pressure cylinder is arranged between the first isolation valve and the third isolation valve, a first cavity of the first pressure cylinder is communicated with an output circuit of the third isolation valve, a second cavity of the first pressure cylinder is communicated with an input circuit of the first isolation valve, the first pressure cylinder is arranged to pressurize the braking pressure of the first cavity of the brake main cylinder when entering a mechanical backup state so as to increase the pedal stroke and reduce the pedal force, the first cavity of the first pressure cylinder is a rodless cavity, and the second cavity of the first pressure cylinder is a rod cavity;
the second pressure cylinder is arranged between a second isolation valve and a fourth isolation valve, a first cavity of the second pressure cylinder is communicated with an output circuit of the fourth isolation valve, a second cavity of the second pressure cylinder is communicated with an input circuit of the second isolation valve, the second pressure cylinder is arranged to pressurize the braking pressure of a second cavity of the brake main cylinder when the second pressure cylinder enters a mechanical backup state, so that the pedal stroke is increased and the pedal force is reduced, the first cavity of the second pressure cylinder is a rodless cavity, and the second cavity of the second pressure cylinder is a rod cavity.
2. The system of claim 1, further comprising a pressure-by-wire source disposed between the first and second isolation valves, the pressure-by-wire source configured to provide hydraulic pressure to the first and third wheel cylinders through the first isolation valve and to provide hydraulic pressure to the second and fourth wheel cylinders through the second isolation valve.
3. The system of claim 1, wherein the simulator control valve is disposed between the master cylinder first chamber and the simulator cylinder, the simulator control valve for controlling communication or disconnection between the simulator cylinder and the master cylinder.
4. The system of claim 1, wherein the simulator control valve is a normally closed valve.
5. A control method of a brake-by-wire system applied to the brake-by-wire system according to any one of claims 1 to 4, comprising:
in response to a request for a mechanical backup state, the third isolation valve is controlled to open to communicate the master cylinder first chamber and the first and third wheel cylinders, and the fourth isolation valve is controlled to open to communicate the master cylinder second chamber and the second and fourth wheel cylinders.
6. The control method according to claim 5, characterized in that the method further comprises,
in response to a request for a mechanical backup state, the simulator control valve is controlled to close to cut off communication between the master cylinder first chamber and the simulator cylinder, and the first isolation valve and the second isolation valve are controlled to close to cut off communication between the source-by-wire pressure and the first brake wheel cylinder and the second brake wheel cylinder.
7. The control method according to claim 5, characterized in that the method further comprises,
and in response to a pedal input signal input by a brake pedal, controlling the simulator control valve to open, so that the brake master cylinder first cavity is communicated with the simulator cylinder, and closing the third isolation valve and the fourth isolation valve.
8. The control method according to claim 7, characterized in that the method further comprises,
converting the pedal input signal to a braking force target demand;
and controlling the first isolation valve and the second isolation valve to be opened according to the braking force target demand, so that the pressure source by wire is equal to the pressure of the first brake wheel cylinder, the second brake wheel cylinder, the third brake wheel cylinder and the fourth brake wheel cylinder.
9. A storage medium, characterized in that it stores instructions which, when executed by a processor, implement the steps of the control method according to any one of claims 5 to 8.
10. A terminal comprising a memory storing instructions and a processor loading the instructions to perform the steps of the control method according to any one of claims 5 to 8.
CN202111010684.XA 2021-08-31 2021-08-31 Brake-by-wire system, control method, storage medium, and terminal Active CN113665540B (en)

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CN107031595A (en) * 2017-04-12 2017-08-11 潘泓冰 New line control brake system
CN207875604U (en) * 2017-09-19 2018-09-18 芜湖伯特利电子控制系统有限公司 Electric line control braking system
CN107444365B (en) * 2017-09-19 2023-03-10 芜湖伯特利电子控制系统有限公司 Electronic line control brake system
CN107697050A (en) * 2017-11-13 2018-02-16 吉林大学 Line traffic control brake fluid system where a kind of liquid high pressure source generator

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