CN112896134B - Vehicle brake-by-wire system overheat protection control method, system and storage medium - Google Patents
Vehicle brake-by-wire system overheat protection control method, system and storage medium Download PDFInfo
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- CN112896134B CN112896134B CN202110208664.7A CN202110208664A CN112896134B CN 112896134 B CN112896134 B CN 112896134B CN 202110208664 A CN202110208664 A CN 202110208664A CN 112896134 B CN112896134 B CN 112896134B
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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
- 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
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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
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
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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
- B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
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- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a vehicle brake-by-wire system overheat protection control method, a system and a storage medium, wherein the method comprises the following steps: acquiring vehicle speed and pedal displacement information; when the vehicle speed and the pedal displacement information are detected to accord with the thermal protection starting condition, an overheating protection instruction is sent to a vehicle brake-by-wire system; and controlling an electronic parking actuator to perform parking braking on the vehicle according to the received overheat protection instruction, and simultaneously controlling an electronic booster to reduce the output torque. After the electronic parking actuator applies the braking force, the output torque and the power of the electronic booster can be greatly reduced, and the brake failure caused by overheating of the electronic booster can be obviously avoided.
Description
Technical Field
The invention relates to the field of automobile braking, in particular to an overheat protection control method and system for a vehicle brake-by-wire system and a storage medium.
Background
The electronic hydraulic line control brake adopts an electronic booster to replace vacuum boosting to establish hydraulic applied braking force in a main cylinder, and the braking intention of a driver is judged according to pedal displacement acquired by a pedal stroke sensor. As the pedal depression depth increases, the motor output power and torque increase, thereby establishing a greater braking hydraulic pressure.
When the driver is congested and waits for traffic lights, if the driver still deeply steps on the brake pedal to brake after stopping, the motor of the electronic booster works with large current for a long time, so that the temperature rise inside the part is overheated, effective protection measures are not taken under the condition, the failure of the electric booster is easily caused, the service life of the part is shortened, and a braking safety accident is caused in serious cases.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides an overheat protection control method, an overheat protection control system and a storage medium for a vehicle brake-by-wire system.
In a first aspect, a vehicle brake-by-wire system overheat protection control method is provided, which includes the following steps:
acquiring vehicle speed and pedal displacement information;
when the vehicle speed and the pedal displacement information are detected to accord with the thermal protection starting condition, an overheating protection instruction is sent to a vehicle brake-by-wire system;
and controlling an electronic parking actuator to perform parking braking on the vehicle according to the received overheat protection instruction, and simultaneously controlling an electronic booster to reduce the output torque.
According to the first aspect, in a first possible implementation manner of the first aspect, after the step of "obtaining vehicle speed and pedal displacement information", the method further includes the following steps:
if the vehicle speed is detected to be zero, obtaining a pedal displacement value and corresponding pedal stepping duration according to the pedal displacement information;
and when the fact that the pedal displacement value is larger than a first preset displacement value and the pedal treading duration time exceeds a preset duration time is detected, it is judged that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition.
According to the first aspect, in a second possible implementation manner of the first aspect, the step of controlling the electronic parking actuator to perform parking braking on the vehicle and simultaneously controlling the electronic booster to reduce the output torque according to the received overheat protection command includes the following steps:
when the electronic power assisting of the electronic booster is decoupled from the input force, the electronic booster is controlled to reduce the output torque, and the main cylinder of the electronic booster is subjected to pressure reduction;
when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic booster is controlled to reduce the output torque, and the high-pressure brake fluid is controlled to enter the energy accumulator;
and acquiring pedal input displacement, and adjusting the displacement gap between the output displacement and the input displacement of the electronic booster according to the pedal input displacement.
According to a second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, after the step of controlling the electronic parking actuator to perform parking braking on the vehicle and simultaneously controlling the electronic booster to reduce the output torque according to the received overheat protection command, the method includes the following steps:
re-acquiring a new pedal displacement value;
and when the displacement value of the new pedal is detected to be smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system, controlling the electronic parking actuator to release, and controlling the electronic booster to normally work.
According to a third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the step of sending an exit overheat protection instruction to the vehicle brake-by-wire system, controlling the electronic parking actuator to release, and controlling the electronic booster to normally operate when the new pedal displacement value is detected to be less than or equal to a second preset displacement value includes the following steps:
when the displacement value of the new pedal is detected to be smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system;
when the electronic power assisting of the electronic booster is decoupled from the input force, the electronic parking actuator is controlled to release, and the electronic booster is controlled according to the new pedal displacement;
when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic parking actuator is controlled to release, brake fluid is controlled to return to the master cylinder and the brake pipeline from the energy accumulator, and the electronic booster is controlled according to the new pedal displacement.
In a second aspect, there is provided an overheat protection control system for a brake-by-wire system of a vehicle, comprising:
the information acquisition module is used for acquiring vehicle speed and pedal displacement information;
the overheating protection module is in communication connection with the information acquisition module and is used for sending an overheating protection instruction to the vehicle brake-by-wire system when detecting that the vehicle speed and the pedal displacement information accord with the overheating protection starting condition;
and the control execution module is in communication connection with the overheating protection module and is used for controlling the electronic parking actuator to perform parking braking on the vehicle and simultaneously controlling the electronic booster to reduce the output torque according to the received overheating protection instruction.
According to the second aspect, in a first possible implementation manner of the second aspect, the method further includes:
the program starting module is in communication connection with the information acquisition module and the overheating protection module and is used for acquiring a pedal displacement value and corresponding pedal treading duration according to the pedal displacement information if the vehicle speed is detected to be zero; and when the fact that the pedal displacement value is larger than a first preset displacement value and the pedal treading duration time exceeds a preset duration time is detected, it is judged that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition.
According to the second aspect, in a second possible implementation manner of the second aspect, the control execution module is configured to, when it is detected that the electronic power assistance of the electronic booster is decoupled from the input force, control the electronic booster to reduce the output torque, and reduce the pressure of a master cylinder of the electronic booster; when the electronic booster is detected to be not decoupled from the input force, the electronic booster is controlled to reduce the output torque, and high-pressure brake fluid is controlled to enter the energy accumulator; and acquiring pedal input displacement, and adjusting the displacement gap between the output displacement and the input displacement of the electronic booster according to the pedal input displacement.
In a third possible implementation manner of the second aspect, the control execution module is further configured to retrieve a new pedal displacement value; when the displacement value of the new pedal is detected to be smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system; when the electronic power assisting of the electronic booster is decoupled from the input force, the electronic parking actuator is controlled to release, and the electronic booster is controlled according to the new pedal displacement; when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic parking actuator is controlled to release, brake fluid is controlled to return to the master cylinder and the brake pipeline from the energy accumulator, and the electronic booster is controlled according to the new pedal displacement.
In a third aspect, a storage medium is provided, on which a computer program is stored, wherein the computer program is executed by a processor to implement the method for testing the solid state disk code.
Compared with the prior art, after the electronic parking actuator applies the braking force, the output torque and the power of the electronic booster can be greatly reduced, and the brake failure caused by overheating of the electronic booster can be obviously avoided.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling overheat protection of a brake-by-wire system of a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for controlling overheat protection of a brake-by-wire system of a vehicle according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an overheat protection control system of a brake-by-wire system of a vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for controlling overheat protection of a brake-by-wire system of a vehicle according to another embodiment of the present invention
Fig. 5 is a schematic structural diagram of an overheat protection control system of a vehicle brake-by-wire system according to another embodiment of the present invention.
Description of the reference numerals
10. A control unit; 20. a pedal; 30. a pedal stroke sensor; 40. an electronic booster; 50. an electronic parking actuator; 100. a vehicle brake-by-wire system overheat protection control system; 110. an information acquisition module; 120. an overheat protection module; 130. a control execution module; 140. and a program starting module.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or functional arrangement, and that any functional block or functional arrangement may be implemented as a physical entity or a logical entity, or a combination of both.
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Note that: the example to be described next is only a specific example, and does not limit the embodiments of the present invention necessarily to the following specific steps, values, conditions, data, orders, and the like. Those skilled in the art can, upon reading this specification, utilize the concepts of the present invention to construct more embodiments than those specifically described herein.
Referring to fig. 1, an embodiment of the present invention provides an overheat protection control method for a brake-by-wire system of a vehicle, including the following steps:
s100, acquiring vehicle speed and pedal displacement information;
s200, when detecting that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition, sending an overheating protection instruction to a vehicle brake-by-wire system;
s300, controlling an electronic parking actuator to perform parking braking on the vehicle and simultaneously controlling an electronic booster to reduce output torque according to the received overheat protection instruction.
Specifically, in the present embodiment, the vehicle brake-by-wire system includes a control unit, a pedal stroke sensor, an electronic booster, and an electronic parking actuator. The pedal stroke sensor is used for acquiring pedal displacement information of the brake pedal. The control unit acquires pedal displacement information acquired by the pedal stroke sensor and can also control the motor of the electronic booster and the electronic parking actuator.
The method for controlling the overheat protection of the vehicle brake-by-wire system is started after a vehicle is powered on, and the current vehicle speed and pedal displacement information of the vehicle are acquired every other preset period to judge whether overheat protection is performed, wherein the pedal displacement information comprises a pedal displacement value and corresponding pedal treading duration. When the detected vehicle speed and pedal displacement information accord with the thermal protection starting condition, the current in-situ parking state is judged, and the time for stepping on the parking pedal is too long, so that the electronic booster is possibly overheated, and an overheating protection instruction is sent to a vehicle brake-by-wire system to execute overheating protection. According to the received overheat protection instruction, the electronic booster is controlled to reduce the output torque, further, the output torque of the electronic booster can be rapidly reduced, so that the temperature of the electronic booster can be rapidly reduced, and the situation that the controller and the actuator of the electronic booster are out of work due to excessive temperature rise to cause safety accidents is avoided. And meanwhile, the electronic parking actuator is controlled to park and brake the vehicle, and the electronic parking compensation braking force is adopted to avoid vehicle sliding because the electronic booster is controlled to reduce the output torque and reduce the braking force.
According to the invention, through coordinated control of the electronic booster, the electronic parking actuator and the like, after the electronic parking actuator applies braking force, the output torque and power of the electronic booster can be greatly reduced, and the brake failure caused by overheating of the electronic booster can be obviously avoided.
Optionally, in another embodiment of the present invention, after the step of "S100 acquiring vehicle speed and pedal displacement information", the method further includes the steps of:
s150, if the vehicle speed is detected to be zero, obtaining a pedal displacement value and corresponding pedal stepping duration according to the pedal displacement information;
and S160, when the fact that the pedal displacement value is larger than a first preset displacement value and the pedal treading duration time exceeds a preset duration time is detected, it is judged that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition.
Specifically, in this embodiment, if it is detected that the vehicle speed is zero, and the vehicle brake-by-wire system overheat protection control method in the present invention is started after the vehicle is powered on, it may be determined that the vehicle is currently in the in-place parking state. In addition, the state of the current parking pedal is further judged according to the acquired pedal displacement information. And obtaining a pedal displacement value and corresponding pedal stepping duration according to the pedal displacement information, and judging that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition when detecting that the pedal displacement value is greater than a first preset displacement value and the pedal stepping duration exceeds the preset duration. The pedal displacement value may be varied, that is, the pedal displacement value is maintained in a state of being greater than the first preset displacement value for a preset duration, but the pedal displacement value may be a value that fluctuates beyond the first preset displacement value, that is, it is determined that the vehicle speed and the pedal displacement information meet the thermal protection activation condition.
The overheat protection control method starts to work after the vehicle is powered on, and the thermal protection program is started after the conditions of the vehicle speed, the pedal displacement value and the pedal stepping duration are met, so that the vehicle can be started in time when required (long-time in-situ parking, namely long-time deep stepping on of the parking pedal).
Alternatively, as shown in fig. 2, in another embodiment of the present invention, the step of controlling the electronic parking actuator to perform parking braking on the vehicle and simultaneously controlling the electronic booster to reduce the output torque according to the received over-temperature protection command at S300 includes the steps of:
s310, when the electronic power assistance of the electronic booster is decoupled from the input force, controlling the electronic booster to reduce the output torque, and reducing the pressure of a main cylinder of the electronic booster;
s320, when the electronic booster is not decoupled from the input force when the electronic booster is detected, controlling the electronic booster to reduce the output torque and controlling the high-pressure brake fluid to enter an energy accumulator;
s330, pedal input displacement is obtained, and the displacement gap between the output displacement and the input displacement of the electronic booster is adjusted according to the pedal input displacement.
Specifically, if the output torque of the electric booster motor is only reduced at present, after the output torque is reduced, the acting force generated by the hydraulic pressure in the master cylinder of the braking system is completely acted on the pedal, so that the pedal rebounds, the unconventional feeling of driving is given, and panic is caused. There is therefore a need to further address the problem of the driver stepping on the pedal.
In this embodiment, whether the electronic booster based on the brake-by-wire system adopts the mutual coupling of the output hydraulic pressure and the input force is different in the corresponding brake control mode. If the electronic power assist of the electronic booster of the brake-by-wire system is coupled with the input force, the reduction of the braking force thereof causes pedal bounce. If the electronic power assistance and the input force of the electronic booster of the brake-by-wire system are decoupled from each other, the reduction of the braking force thereof does not affect the pedal.
Therefore, when the received overheat protection instruction is received, the type information of the electronic booster of the brake-by-wire system is obtained, and the electronic booster is judged to be in a decoupling type or a non-decoupling type according to the type information.
When the electronic power assisting of the electronic booster is decoupled from the input force, the electronic booster is controlled to reduce the output torque, the main cylinder of the electronic booster is depressurized, the pedal feeling of a driver comes from the pedal feeling simulator, and meanwhile, the electronic booster reduces the output torque and outputs hydraulic pressure, so that the input force cannot be changed, and therefore the pedal feeling of the driver is not changed.
When the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic booster is controlled to reduce the output torque, meanwhile, in order to avoid the situation that the braking force is reduced and fed back to the pedal, the brake-by-wire system also needs to comprise an energy accumulator, and the internal valve system of the electronic booster is controlled to act so that the master cylinder and the brake pipeline can enable high-pressure brake fluid to enter the energy accumulator, so that the brake fluid pressure of the master cylinder is reduced. The control target of the electronic booster controller is changed from the master cylinder hydraulic pressure to the output displacement of the electronic booster, and it is ensured that the pedal feel of the driver is unchanged, that is, the pedal stroke (input displacement of the electronic booster) is kept unchanged, when the current electronic booster reduces the output torque, that is, the master cylinder hydraulic pressure is reduced.
When the electronic booster reduces the output torque, theoretically, the output displacement of the electronic booster can be changed along with the output torque, so that the input displacement of the electronic booster is changed, and the pedal feeling of a driver is influenced. Therefore, the displacement clearance between the output displacement and the input displacement of the electronic booster is controlled and adjusted, the relation curve of the pedal force and the pedal stroke (F-S) of the pedal feeling simulator set by the system is met, and the output displacement and the input of the electronic booster are guaranteed to be kept unchanged when the output torque of the electronic booster is reduced. Therefore, the pedal input displacement is acquired, and the displacement gap between the output displacement and the input displacement of the electronic booster is adjusted according to the pedal input displacement.
When the hydraulic pressure of the main cylinder is reduced, the displacement gap between the output displacement and the input displacement of the electronic booster is adjusted, the electronic booster only balances the input force of the pedal, the output torque and the power of the motor are correspondingly reduced, the electronic booster is prevented from working in a high-current state for a long time, and overheating protection is realized.
When the thermal protection strategy takes effect, the pedal feeling of the driver is consistent with that of the conventional brake, and the driving comfort is not reduced.
Optionally, in another embodiment of the present invention, after the step of "S300 controlling the electronic parking actuator to perform parking braking on the vehicle and simultaneously controlling the electronic booster to reduce the output torque according to the received over-temperature protection command", the method includes the following steps:
s400, acquiring a new pedal displacement value again;
s500, when the fact that the displacement value of the new pedal is smaller than or equal to a second preset displacement value is detected, an overheat protection quitting instruction is sent to a vehicle brake-by-wire system, the electronic parking actuator is controlled to release, and the electronic booster is controlled to work normally.
Specifically, in this embodiment, after the overheat protection program is executed, the new pedal displacement value is obtained again, and whether to exit the overheat protection program is determined according to the new pedal displacement value. When the fact that the displacement value of the new pedal is smaller than or equal to a second preset displacement value is detected, the fact that the depth of the driver stepping on the parking pedal is reduced is shown, and the influence of the changed pedal depth on the electronic booster is small, so that an overheat protection quitting instruction is sent to a vehicle brake-by-wire system, the electronic parking actuator is controlled to release, the electronic booster is controlled to normally work, and the relation between the electronic booster and the wheel side hydraulic pressure and the pedal stroke is reestablished. Wherein the second predetermined displacement value is less than the first predetermined displacement value.
According to the invention, after the brake pedal is released to a certain position, the thermal protection strategy is timely withdrawn from recovering the conventional brake, so that the response time before acceleration can be shortened. In addition, the starting and exiting of the overheat protection program can be prompted by methods such as an indicator light, a vehicle-mounted computer screen, a loudspeaker and the like.
Optionally, in another embodiment of the present invention, the step of "S500 sending an exiting overheat protection instruction to the vehicle brake-by-wire system, controlling the electronic parking actuator to release, and controlling the electronic booster to normally operate when it is detected that the new pedal displacement value is less than or equal to a second preset displacement value" includes the following steps:
s510, when detecting that the displacement value of the new pedal is smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system;
s520, when the electronic power assisting of the electronic booster is decoupled from the input force, controlling the electronic parking actuator to release, and controlling the electronic booster according to the new pedal displacement;
s530, when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic parking actuator is controlled to release, brake fluid is controlled to return to the master cylinder and the brake pipeline from the energy accumulator, and the electronic booster is controlled according to the new pedal displacement.
Specifically, in this embodiment, when it is detected that the new pedal displacement value is less than or equal to a second preset displacement value, an exit overheat protection instruction is sent to the vehicle brake-by-wire system. Likewise, the electronic booster type based on the brake-by-wire system is a decoupled type or a non-decoupled type, and the corresponding operation executed after the overheat protection command is exited is different.
When the electronic power assisting of the electronic booster is decoupled from the input force, the electronic parking actuator is controlled to release, and the electronic booster is controlled again according to the displacement of the new pedal. When the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic parking actuator is controlled to release, brake fluid is controlled to return to the master cylinder and the brake pipeline from the energy accumulator, the relation between the electronic booster and the wheel side hydraulic pressure and the pedal stroke is reestablished, the electronic booster returns to normal work, and the electronic booster is controlled according to the new pedal displacement.
As shown in fig. 3, the vehicle brake-by-wire system includes a control unit, a pedal 20, a pedal stroke sensor 30, an electronic booster 40, and an electronic parking actuator 50. The pedal stroke sensor 30 is used to acquire pedal displacement information of the brake pedal 20. The control unit acquires pedal displacement information collected by the pedal stroke sensor 30, and may also control the motor of the electronic booster 40 and the electronic parking actuator 50.
As shown in FIG. 4, the overheat protection control method for the vehicle brake-by-wire system comprises the following steps:
s1 when the vehicle is in the power-on state, the control unit obtains the vehicle speed.
If the vehicle speed is 0, S2 proceeds to step S3, where pedal displacement information is determined. Otherwise, return to step S1.
The S3 control unit compares the pedal displacement value with a first preset displacement value in the system according to the pedal displacement information collected by the pedal stroke sensor 30, and if the pedal displacement value is greater than the first preset displacement value in the system, the control unit proceeds to step S4 to determine the pedal-on duration time when the pedal displacement value is greater than the first preset displacement value. Otherwise, return to step S2.
The S4 control unit determines the pedal-on duration that the system pedal displacement value is greater than the first preset displacement value in the system, and if the pedal-on duration is greater than the preset duration in the system, the control unit starts executing the thermal protection program of the electronic booster 40, and then proceeds to step S5. Otherwise, go back to the previous step S3 to determine pedal displacement information.
After the thermal protection program of S5 is started, the control unit sends a parking instruction to the electronic parking controller through the communication line, and the electronic parking actuator 50 performs parking braking on the vehicle.
And S6, after the vehicle is parked, the control unit controls the master cylinder to be decompressed.
The S7 brake-by-wire system employs the electronic booster 40 in which the output hydraulic pressure (electronic booster) and the input force are decoupled from each other, and the control unit of the electronic booster 40 directly reduces the output torque of the motor of the electronic booster 40, and preferably, the output torque of the electronic booster 40 is rapidly reduced to 0, so as to rapidly reduce the temperature of the electronic booster 40. The pedal feeling is realized by a pedal feeling simulator, and the relation curve of the pedal force and the pedal stroke (F-S) is kept unchanged after the output torque of the motor is reduced.
And after the overheat protection program is executed in the step S8, judging whether the new pedal displacement value is smaller than a second preset displacement value of the system, and if the new pedal displacement value is still larger than the second preset displacement value of the system, turning to the step S7 to maintain the operation of the thermal protection control program in a circulation mode. If the new pedal displacement value is not greater than the second predetermined system displacement value, the thermal protection process of the electronic booster 40 may be exited to step S9.
S9, normal braking of the electronic booster 40 is recovered, the relation between the electronic booster 40 and the wheel side hydraulic pressure and the pedal stroke is reestablished, the control unit controls the electronic parking controller, and the electronic parking actuator 50 releases.
According to the invention, through coordination control of the vehicle control unit, the electronic booster, the electronic parking actuator and the like, after the electronic parking actuator applies braking force, the output torque and power of the electronic booster can be greatly reduced, and the brake failure caused by overheating of the electronic booster can be obviously avoided. Meanwhile, when the thermal protection strategy takes effect, the pedal feeling of the driver is kept consistent with that of the conventional brake, and the driving comfort is not reduced. After the brake pedal is released to a certain position, the thermal protection strategy timely quits and recovers the conventional braking, and the response time before acceleration can be shortened.
As shown in fig. 5, an embodiment of the present invention provides an overheat protection control system 100 for a brake-by-wire system of a vehicle, including:
the information acquisition module 110 is used for acquiring vehicle speed and pedal displacement information;
the overheating protection module 120 is in communication connection with the information acquisition module 110, and is configured to send an overheating protection instruction to a vehicle brake-by-wire system when detecting that the vehicle speed and the pedal displacement information meet the overheating protection starting condition;
and the control execution module 130 is in communication connection with the overheating protection module 120 and is used for controlling an electronic parking actuator to perform parking braking on the vehicle and simultaneously controlling an electronic booster to reduce the output torque according to the received overheating protection instruction.
Further comprising:
a program starting module 140, communicatively connected to the information obtaining module 110 and the overheating protection module 120, configured to obtain a pedal displacement value and a corresponding pedal depression duration according to the pedal displacement information if it is detected that the vehicle speed is zero; and when the fact that the pedal displacement value is larger than a first preset displacement value and the pedal treading duration time exceeds a preset duration time is detected, it is judged that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition.
The control execution module 130 is configured to, when the electronic power assistance of the electronic booster is decoupled from the input force, control the electronic booster to reduce the output torque, and reduce the pressure of a master cylinder of the electronic booster; when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic booster is controlled to reduce the output torque, and the high-pressure brake fluid is controlled to enter the energy accumulator; and acquiring pedal input displacement, and adjusting the displacement gap between the output displacement and the input displacement of the electronic booster according to the pedal input displacement.
The control execution module 130 is further configured to retrieve a new pedal displacement value; when the displacement value of the new pedal is detected to be smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system; when the electronic power assisting of the electronic booster is decoupled from the input force, the electronic parking actuator is controlled to release, and the electronic booster is controlled according to the new pedal displacement; when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic parking actuator is controlled to release, brake fluid is controlled to return to the master cylinder and the brake pipeline from the energy accumulator, and the electronic booster is controlled according to the new pedal displacement.
Specifically, the functions of each module in this embodiment have been described in detail in the corresponding method embodiment, and thus are not described in detail again.
Based on the same inventive concept, the embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements all or part of the method steps of the above method.
The present invention can implement all or part of the processes of the above methods, and can also be implemented by using a computer program to instruct related hardware, where the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of the method steps in the method.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the computer device and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the computer device by executing or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the cellular phone. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. An overheat protection control method for a vehicle brake-by-wire system is characterized by comprising the following steps:
acquiring vehicle speed and pedal displacement information;
when the vehicle speed and the pedal displacement information are detected to accord with the thermal protection starting condition, an overheating protection instruction is sent to a vehicle brake-by-wire system;
controlling an electronic parking actuator to perform parking braking on the vehicle according to the received overheat protection instruction, and simultaneously controlling an electronic booster to reduce output torque;
the step of controlling an electronic parking actuator to perform parking braking on the vehicle and controlling an electronic booster to reduce output torque according to the received overheat protection instruction comprises the following steps of:
when the electronic power assisting of the electronic booster is decoupled from the input force, the electronic booster is controlled to reduce the output torque, and the main cylinder of the electronic booster is subjected to pressure reduction;
when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic booster is controlled to reduce the output torque, and the high-pressure brake fluid is controlled to enter the energy accumulator;
and acquiring pedal input displacement, and adjusting the displacement gap between the output displacement and the input displacement of the electronic booster according to the pedal input displacement.
2. The vehicle brake-by-wire system overheat protection control method according to claim 1, wherein after said step of "acquiring vehicle speed and pedal displacement information", further comprising the steps of:
if the vehicle speed is detected to be zero, obtaining a pedal displacement value and corresponding pedal stepping duration according to the pedal displacement information;
and when the fact that the pedal displacement value is larger than a first preset displacement value and the pedal treading duration time exceeds a preset duration time is detected, it is judged that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition.
3. The vehicle brake-by-wire system overheat protection control method according to claim 1, wherein the step of controlling the electronic parking actuator to park the vehicle brake while controlling the electronic booster to reduce the output torque in accordance with the received overheat protection command, is followed by the step of:
re-acquiring a new pedal displacement value;
and when the displacement value of the new pedal is detected to be smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system, controlling the electronic parking actuator to release, and controlling the electronic booster to normally work.
4. The vehicle brake-by-wire system overheat protection control method according to claim 3, wherein the step of sending an overheat protection quit instruction to the vehicle brake-by-wire system, controlling the electronic parking actuator to release, and controlling the electronic booster to normally operate when it is detected that the new pedal displacement value is equal to or less than a second preset displacement value comprises the steps of:
when the displacement value of the new pedal is detected to be smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system;
when the electronic power assisting of the electronic booster is decoupled from the input force, the electronic parking actuator is controlled to release, and the electronic booster is controlled according to the new pedal displacement;
when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic parking actuator is controlled to release, brake fluid is controlled to return to the master cylinder and the brake pipeline from the energy accumulator, and the electronic booster is controlled according to the new pedal displacement.
5. An overheat protection control system for a brake-by-wire system of a vehicle, comprising:
the information acquisition module is used for acquiring vehicle speed and pedal displacement information;
the overheating protection module is in communication connection with the information acquisition module and is used for sending an overheating protection instruction to the vehicle brake-by-wire system when detecting that the vehicle speed and the pedal displacement information accord with the overheating protection starting condition;
the control execution module is in communication connection with the overheating protection module and is used for controlling an electronic parking actuator to perform parking braking on a vehicle according to the received overheating protection instruction and controlling an electronic booster to reduce output torque;
the control execution module is used for controlling the electronic booster to reduce the output torque and reduce the pressure of a main cylinder of the electronic booster when the electronic booster of the electronic booster is decoupled from the input force; when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic booster is controlled to reduce the output torque, and the high-pressure brake fluid is controlled to enter the energy accumulator; and acquiring pedal input displacement, and adjusting the displacement gap between the output displacement and the input displacement of the electronic booster according to the pedal input displacement.
6. The vehicle brake-by-wire system overheat protection control system according to claim 5, further comprising:
the program starting module is in communication connection with the information acquisition module and the overheating protection module and is used for acquiring a pedal displacement value and corresponding pedal treading duration according to the pedal displacement information if the vehicle speed is detected to be zero; and when the fact that the pedal displacement value is larger than a first preset displacement value and the pedal treading duration time exceeds a preset duration time is detected, it is judged that the vehicle speed and the pedal displacement information accord with a thermal protection starting condition.
7. The vehicle brake-by-wire system overheat protection control system according to claim 5, wherein said control execution module is further configured to reacquire a new pedal displacement value; when the displacement value of the new pedal is detected to be smaller than or equal to a second preset displacement value, sending an overheat protection quitting instruction to a vehicle brake-by-wire system; when the electronic power assisting of the electronic booster is decoupled from the input force, the electronic parking actuator is controlled to release, and the electronic booster is controlled according to the new pedal displacement; when the electronic power assisting of the electronic booster is not decoupled from the input force, the electronic parking actuator is controlled to release, brake fluid is controlled to return to the master cylinder and the brake pipeline from the energy accumulator, and the electronic booster is controlled according to the new pedal displacement.
8. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a vehicle brake-by-wire system overheat protection control method according to any one of claims 1 to 4.
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| CN202110208664.7A CN112896134B (en) | 2021-02-24 | 2021-02-24 | Vehicle brake-by-wire system overheat protection control method, system and storage medium |
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| CN113567118B (en) * | 2021-06-16 | 2023-04-11 | 东风汽车集团股份有限公司 | Wet clutch sliding friction transmission performance detection method |
| CN115139998B (en) * | 2022-07-13 | 2024-04-26 | 东风汽车集团股份有限公司 | Automatic parking control method, device, equipment and readable storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010063237A (en) * | 2008-09-02 | 2010-03-18 | Toyota Motor Corp | Controller and control method of vehicle |
| JP2012201315A (en) * | 2011-03-28 | 2012-10-22 | Advics Co Ltd | Electric brake device |
| CN103043045A (en) * | 2011-10-14 | 2013-04-17 | 株式会社万都 | Electronic parking brake system and control method thereof |
| CN103802688A (en) * | 2012-11-12 | 2014-05-21 | 上海电驱动股份有限公司 | Low-speed torque output capability improving method for vehicle motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2880602B1 (en) * | 2005-01-11 | 2007-03-16 | Messier Bugatti Sa | PROTECTIVE METHOD IN A BRAKE SYSTEM OF A VEHICLE WITH ELECTRIC BRAKES |
-
2021
- 2021-02-24 CN CN202110208664.7A patent/CN112896134B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010063237A (en) * | 2008-09-02 | 2010-03-18 | Toyota Motor Corp | Controller and control method of vehicle |
| JP2012201315A (en) * | 2011-03-28 | 2012-10-22 | Advics Co Ltd | Electric brake device |
| CN103043045A (en) * | 2011-10-14 | 2013-04-17 | 株式会社万都 | Electronic parking brake system and control method thereof |
| CN103802688A (en) * | 2012-11-12 | 2014-05-21 | 上海电驱动股份有限公司 | Low-speed torque output capability improving method for vehicle motor |
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