CN103569085A - Electronic parking brake running-in device and method, electronic parking system and vehicle - Google Patents

Abstract

The invention provides a running-in device for an electronic parking brake, a running-in method, an electronic parking system and a corresponding vehicle. The running-in device includes: a running-in command input module for inputting a running-in command and running-in parameters; a network interface module for communicating with the The electronic control unit connects and communicates, and sends the running-in command and running-in parameters to the electronic control unit, and the electronic control unit controls the parking brake to generate corresponding electronic parking pull force according to the running-in command and running-in parameters, so that the vehicle is running. Run-in the parking brake. The electronic parking system includes an electronic control unit, an actuator and a parking brake that are connected in sequence, and the electronic control unit is configured to receive a running-in command and a running-in parameter, and control the actuator and the parking brake to generate a corresponding electronic parking pull, thereby Run in the parking brake with the vehicle running. The invention can precisely control the running-in process and flexibly adapt to the running-in site.

Description

Electronic parking brake running-in device and method, electronic parking system and vehicle

technical field

The invention relates to the technical field of automotive electronics, in particular to an electronic parking brake running-in device, a running-in method, an electronic parking system and a corresponding vehicle.

Background technique

Due to the installation characteristics of the brake friction plate, the joint area of the newly installed brake friction plate cannot meet the standard, resulting in low friction efficiency in the initial state, which may not meet the design requirements. Because the service brake can be operated by stepping on the brakes during driving, the friction efficiency will continue to increase due to the dynamic running-in of the wheels and the friction of the friction plates during driving. However, the parking brake usually only works under static conditions, and the number of times of work is much less than that of the service brake. The initial friction efficiency is low. The parking brake must be worn in.

General brakes can be divided into the following two categories: as shown in Figure 1a, the service brake and parking brake are integrated, that is, the integrated brake for driving and parking; as shown in Figure 1b, the service brake and parking brake are independent, that is, independent parking The parking brake is independently controlled by the parking brake, the parking cable or the actuator. The running-parking integrated brake can be completed through running-in of the service brake, so there is no need for separate running-in. The independent parking brake needs to be worn in due to its limited number of uses and mostly static.

Traditional mechanical handbrakes can be run in in two ways. The first is the "parts running-in" method: after the parking brake is sub-assembled, special equipment is used for running-in, and after reaching the standard, it is sent to the final assembly process. The cost of equipment in this way is high, and the brakes of different models need to make different fixtures for installation and running-in. And it needs to consume a lot of man-hours for the preparation and transportation of sub-packaging and running-in. In addition, it is necessary to prevent and deal with the safety risks of property and personnel during the transportation of parts, as well as the cost after the accident, and the running-in of parts cannot be applied to the aftermarket. The second is the "whole vehicle running-in" method: after the whole vehicle is assembled, the vehicle is driven under the braking condition of the parking brake to achieve a running-in process similar to that of a service brake, so as to achieve the purpose of dynamic running-in, which can be tested in the assembly line The hub table finish can also be done on the runway.

In the current market, the popularity rate of electronic parking brakes is gradually increasing. For electronic parking brakes, the following methods are currently used for running-in:

1. Electronic parking combined with "parts running-in", after the whole vehicle is assembled, there is no need to run-in the whole vehicle. After the sub-assembly of the electronic parking brake is completed, special equipment is used for running-in, and after reaching the standard, it is sent to the final assembly process. The cost of equipment in this way is high, and the electronic parking brakes of different models need to make different fixtures for installation and running-in. In addition, it will take a lot of man-hours for the preparation, transportation, etc. of subpackaging and running-in, and it cannot be applied to the aftermarket.

2. Electronic parking combined with "vehicle running-in", because there is no parking force selection in the normal function of electronic parking, and the parking force is relatively large, therefore, it is judged that when the vehicle is running and the parking command is executed, the dynamic emergency control system will be activated. Pull up slowly to the maximum force, and eventually the wheel will be completely locked. When the wheels are not rolling, the dynamic running-in process cannot be completed. In order to achieve the running-in effect, it is necessary to repeatedly use the dynamic braking method for running-in, repeated acceleration and deceleration. And because the running-in amount of each parking deceleration is constantly changing, the manual operation cannot accurately correspond to the running-in effect, and the efficiency is very low.

Contents of the invention

Features and advantages of the invention are set forth in part in the description which follows, or may be obvious from the description, or may be learned by practice of the invention.

In order to solve the problems of the prior art, the present invention provides an electronic parking brake running-in device and method, an electronic parking system and a vehicle, adopting the method of electronic parking combined with "whole vehicle running-in", through accurate running-in parameters such as running-in force And the control of the running-in distance, during a car acceleration process, the electronic parking brake is continuously run-in to accurately meet the running-in amount requirements.

The technical solution adopted by the present invention to solve the problems of the technologies described above is as follows:

According to one aspect of the present invention, an electronic parking brake running-in device is provided, comprising:

A running-in command input module is used for inputting a running-in command and a running-in parameter;

The network interface module is used to connect and communicate with the electronic control unit of the electronic parking system of the vehicle, and send the running-in command and the input or preset running-in parameters to the electronic control unit, and the electronic control unit controls the electronic parking system according to the running-in command and running-in parameters. The parking brake of the parking system generates a corresponding electronic parking pull, so that the parking brake is worn in while the vehicle is running.

According to an embodiment of the present invention, the electronic parking brake running-in device also includes a parking force testing device and a brake efficiency calculation module, the parking force testing device is used to test the parking force of the vehicle, and the parking force test The value is output to the brake efficiency calculation module, and the brake efficiency calculation module calculates the brake efficiency value according to the following formula:

Brake efficiency = K*parking force/electronic parking pull; where K is a coefficient obtained through experiments;

If the calculated brake efficiency value reaches the set value, an instruction to exit running-in is sent to the electronic control unit through the network interface module.

According to another aspect of the present invention, an electronic parking system is provided, including an electronic control unit, an actuator and a parking brake connected in sequence, wherein: the electronic control unit is configured to receive a running-in command and a running-in parameter, and according to the running-in The command and break-in parameters control the actuator and the parking brake to generate the corresponding electronic parking pull, so as to break in the parking brake while the vehicle is running.

According to an embodiment of the present invention, a force sensor is integrated in the electronic parking system to monitor the electronic parking tension in real time, and the electronic control unit corrects the running-in parameters according to the monitored electronic parking tension.

According to an embodiment of the present invention, the electronic control unit is configured to control the action of the actuator and the electronic parking brake when the set running-in target parameter is reached during the running-in process of the electronic parking brake, and exit the running-in process, and the running-in target parameter Including the running-in force and the running-in distance, the running-in force is the electronic parking pull force generated by the electronic control unit controlling the parking brake, and the running-in distance is the rolling distance of the wheel being run-in. Exit the running-in process under the control of the electronic control unit.

According to still another aspect of the present invention, a vehicle is provided, which has the electronic parking system according to any one of the above technical solutions.

According to another aspect of the present invention, there is provided a method for running in an electronic parking brake, which includes the steps of:

Send the running-in parameters and running-in instructions to the electronic control unit of the electronic parking system of the vehicle;

The electronic control unit controls the parking brake to generate a corresponding electronic parking pull force according to the running-in command and the running-in parameters, and the parking brake is run-in when the vehicle is running.

According to an embodiment of the present invention, the running-in parameters include a running-in target parameter, and during the running-in process of the parking brake, if the set value of the running-in target parameter is reached, the running-in process will be exited.

According to an embodiment of the present invention, the running-in target parameters include a running-in force and a running-in distance, wherein the running-in force is the electronic parking pulling force generated by the electronic control unit controlling the parking brake, and the running-in distance is the rolling distance of the wheel being worn in. After running in the set running-in distance with the specified running-in force, the electronic control unit controls to exit the running-in process.

According to an embodiment of the present invention, it also includes testing the parking force of the vehicle, and calculating the brake efficiency value according to the following formula:

Brake efficiency = K*parking force/electronic parking pull; where K is a coefficient obtained through experiments;

The running-in target parameter adopts the brake efficiency value, and if the calculated brake efficiency value reaches the set value, an instruction to exit the running-in is issued to the electronic control unit.

According to an embodiment of the present invention, a force sensor is integrated in the electronic parking system to monitor the electronic parking tension in real time, and the electronic control unit corrects the running-in parameters according to the monitored electronic parking tension.

The present invention judges the amount of running-in by accumulating the running-in force and distance, receives input from the operator through the running-in device, accurately assigns the running-in target task to the electronic control unit (ECU) of the electronic parking system (EPB), and controls the running-in process. The ECU of the parking system is responsible for controlling the actuator, which can precisely control the running-in force and calculate the running-in distance. For different vehicles or brakes, different running-in parameters are required, and the parameters can be calibrated in the vehicle development stage, without changing the ECU software and running-in device software, only adding parameters; during the running-in process, manual intervention can be exited, and both EPB and equipment running-in programs have Relevant safety protection algorithms to ensure the safety of vehicles, parts, equipment and personnel during the running-in process; due to the precise control of the running-in force and running-in distance, it can ensure that the EPB running-in is more consistent than manual operation of the handbrake; The parking force can be detected during running-in, so that the consistency of the factory can be guaranteed and the man-hour can be reduced. The invention can precisely control the running-in process, flexibly adapt to the running-in site, and greatly improves the running-in efficiency of the electronic parking brake.

The features and aspects of these and other embodiments will be better understood by those of ordinary skill in the art from reading the description.

Description of drawings

The advantages and implementation methods of the present invention will be more obvious by referring to the accompanying drawings and describing the present invention in conjunction with examples below, wherein the content shown in the accompanying drawings is only used for explaining the present invention, and does not constitute any sense of the present invention The constraints, in the attached image:

Fig. 1a is a schematic diagram of the principle of a brake using a travel-stationary integrated brake in the prior art;

Fig. 1b is a schematic diagram of the principle of a brake using an independent parking brake in the prior art;

FIG. 2 is a schematic structural view of an electronic parking brake running-in device and an electronic parking system of a vehicle according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of a running-in method for an electronic parking brake according to an embodiment of the present invention.

Detailed ways

As shown in Figure 2, the electronic parking brake running-in device according to the embodiment of the present invention includes: a running-in command input module for inputting a running-in command and a running-in parameter; a network interface module for communicating with the electronic control unit of the electronic parking system of the vehicle Connect and communicate, send the running-in command and the input or preset running-in parameters to the electronic control unit, and the electronic control unit controls the parking brake of the electronic parking system to generate corresponding electronic parking pull according to the running-in command and running-in parameters, thus Run in the parking brake with the vehicle running.

In a specific example of the running-in device, the electronic parking brake running-in device also includes a parking force testing device and a brake efficiency calculation module, the parking force testing device is used to test the parking force of the vehicle, and the parking force The test value is output to the brake efficiency calculation module, and the brake efficiency calculation module calculates the brake efficiency value according to the following formula:

Brake efficiency = K*parking force/electronic parking pull; where K is a coefficient obtained through experiments;

If the calculated brake efficiency value reaches the set value, an instruction to exit running-in is sent to the electronic control unit through the network interface module.

As shown in FIG. 3 , the embodiment of the present invention also provides an electronic parking brake running-in method, which includes steps:

Send the running-in parameters and running-in instructions to the electronic control unit of the electronic parking system of the vehicle;

The electronic control unit controls the parking brake to generate a corresponding electronic parking pull force according to the running-in command and the running-in parameters, and the parking brake is run-in when the vehicle is running.

The network interface module of the embodiment of the present invention adopts a CAN (Controller Area Network, ie controller local area network) network interface module. The running-in parameters may include a running-in target parameter. During the running-in process of the parking brake, if the set value of the running-in target parameter is reached, the running-in process will be exited.

The running-in target parameters may include the running-in force and the running-in distance. The running-in force is the electronic parking pull force generated by the electronic control unit controlling the parking brake. The running-in distance is the rolling distance of the wheel being run-in. After the running-in distance, it is controlled by the electronic control unit to exit the running-in process.

The running-in target parameter can also use the brake efficiency value, so the parking force of the vehicle needs to be tested, and the brake efficiency value is calculated according to the following formula:

Brake efficiency = K*parking force/electronic parking pull; where K is a coefficient obtained through experiments;

If the calculated brake efficiency value reaches the set value, an instruction to exit running-in is issued to the electronic control unit.

The main function of the running-in instruction input module is to accept the personnel start-up running-in instruction for starting the running-in program. The command to start the running-in can be directly operated by personnel; it can also be controlled by the running-in device, and the running-in device will automatically start the running-in process after the previous inspection process is passed.

The running-in parameters can be input through the running-in command input module (for example, using a human-machine interface module) when the running-in command is ready to start, or can be stored in the running-in device, and called when the running-in is started, automatically corresponding to the parameters required by various models. In this case, the man-machine interface can be used to modify the stored running-in parameters on the basis of appropriate authority.

As shown in Figure 2, the embodiment of the present invention also provides an electronic parking system (EPB, Electrical Parking Brake), including an electronic control unit (ECU, Electronic Control Unit), an actuator and a parking brake connected in sequence, and the electronic control unit is set In order to be suitable for receiving the running-in instruction and the running-in parameter, and controlling the actuator and the parking brake to generate corresponding electronic parking pull force according to the running-in instruction and the running-in parameter, so as to perform the running-in of the parking brake when the vehicle is running. Preferably, a force sensor is integrated in the electronic parking system to monitor the electronic parking tension in real time, and the electronic control unit corrects the running-in parameters according to the monitored electronic parking tension.

The electronic control unit is set to control the action of the actuator and the electronic parking brake to exit the running-in process when the set running-in target parameters are reached during the running-in process of the electronic parking brake. The running-in target parameters include the running-in force and the running-in distance. The force is the electronic parking pull force generated by the electronic control unit controlling the parking brake, and the running-in distance is the distance traveled by the wheel. After the set running-in force is used to run-in the set running-in distance, the electronic control unit controls to exit the running-in process.

The present invention also provides a vehicle, which has the electronic parking system according to any one of the above technical solutions.

In order to detect the parking force, two methods can be used for detection:

1. The force sensor is integrated in the electronic parking system, which can directly obtain the pulling force of the electronic parking and continuously monitor it. The force monitoring process has nothing to do with whether the electronic parking is being executed.

2. Judgment by means of execution current, etc., only when the parking or release action is performed, the current situation detection can be passed. When there is no action, regardless of the parking or release state, the motor current has nothing to do with the force (generally zero).

The present invention preferably adopts the first method, that is, integrating a force sensor in the electronic parking system to monitor the electronic parking tension in real time, and the electronic control unit can correct the running-in parameters according to the monitored electronic parking tension.

The specific run-in process of the present embodiment is described in detail below:

1. The run-in process starts

The running-in process requires personnel to input the running-in command and running-in parameters. The running-in parameters include the running-in force (such as 300N) and the running-in distance (such as 200m). Correction in real time.

2. Exit the run-in process

a) Exit the running-in process by determining the running-in distance

As shown in Figure 2, the running-in distance is calculated by the ECU of the EPB, integrated according to the wheel speed signal provided by the vehicle wheel speed sensor, and sent to the ECU through the CAN network. Qualifying distance criteria are entered manually. Break-in targets for different vehicles and brake systems, obtained through test vehicle calibration.

b) Exit the running-in process by determining the brake efficiency

The brake efficiency is calculated by the running-in device. Brake efficiency η=K*parking force/electronic parking pull. According to the test data of the best state after complete running-in, the K value can be determined. When running in completely, η=100%. When determining the K value, for example: the measured maximum parking force = 5000N, the corresponding electronic parking pull force = 1500N, η = 100%, then K = 0.3. Then according to the vehicle parameter target, under the standard parking pull force (such as 800N), the vehicle can stop on the specified slope (20%), then the set value of the brake efficiency η can be determined (such as 80%). After running-in, if the brake efficiency η>set value can be obtained, the vehicle off-line requirements are met.

As shown in Figure 3, during the running-in process, the real-time pulling force is continuously fed back through the ECU of the EPB, and the parking force is detected by the hub device, and the real-time brake efficiency η is calculated by the running-in device. If the brake efficiency η meets the requirements, an exit run-in command is issued to the ECU of the EPB.

3. Confirmation of running-in effect

The above solution b) is a method for running-in and testing at the same time, and the efficiency is very high. However, if the equipment does not support it, the above-mentioned solution a) can be used for running-in, which needs to be confirmed in the independent parking force detection link after the running-in is completed. Confirmation method is similar to b) scheme.

It can be manually intervened and exited during the running-in process, and both the EPB and the running-in device are equipped with relevant safety protection algorithms to ensure the safety of vehicles, parts, equipment and personnel during the running-in process. Due to the precise control of running-in force and running-in distance, EPB running-in can be guaranteed to be more consistent than manual handbrake operation. When running in off-line, the parking force can be detected at the same time, so that the consistency of the factory can be guaranteed and the man-hour can be reduced. If the method of calculating the brake efficiency is adopted, then this is the target for running-in qualification. If the running-in process is separated from the testing process, the passing of the running-in force and the running-in distance is the qualified target.

During specific implementation, there may be two types of running-in parameters input by the running-in device to the ECU, one is a running-in limit parameter, and the other is a running-in target parameter. The running-in limit parameter is used to limit the running-in starting condition, the limit exit condition and the input running-in parameter range during the running-in process, including the running-in distance limit, the running-in force limit, and the running-in speed limit. If the running-in parameter received by the ECU exceeds the running-in limit parameter, it refuses to execute the command to prevent input errors or human errors. The running-in target parameters are the currently required running-in force and running-in distance. The calculation of the running-in distance uses the two corresponding wheels of the parking brake used in the running-in as the calculation subject, and the running distance of the two wheels after the running-in is turned on can be respectively obtained through the integral operation of the wheel speed. Whether it exceeds the "distance limit" in the running-in limit condition, the larger one of the two wheel integral results can be selected. If the running-in target parameter is met, the smaller one can be referred to. It can be judged by the specially increased program for running-in in the ECU of the EPB.

In order to ensure safety, the running-in can only be started when it is stationary and the relevant functions are normal. After starting the running-in command, the ECU controls to reach the target running-in force before allowing the driving vehicle to accelerate. Avoid potential safety hazards caused by starting this function during high-speed processes. In order to prevent the break-in function from not being exited, resulting in dragging the brakes, the break-in exit conditions include overspeed exit. If the speed is greater than the running-in speed limit during the running-in process, it will automatically exit the running-in process. After exiting break-in due to various errors, the electronic parking brake turns to released state.

The running-in device of the present invention is a device that sends running-in instructions to the ECU of the EPB according to the design process, and can be realized in the following form: when used in a production line, it can be added to the rotating hub/braking force test bench in the vehicle production line by adding software functions It can be realized by means of transformation; when it is used in after-sales 4S stores, it can be realized by modifying the software of portable test tools (such as after-sales diagnostic instruments).

The present invention is suitable for independent parking brakes, and of course, the method and device of the present invention can also be used for running-in integrated brakes.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. Those skilled in the art can implement the present invention with various variants without departing from the scope and essence of the present invention. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield a still further embodiment. The above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of rights of the present invention. All equivalent changes made by using the description and drawings of the present invention are included in the scope of rights of the present invention.

Claims (11)

1. an electric parking brake running-in machine, is characterized in that comprising:

Break-in instruction input module, for inputting break-in instruction and break-in parameter;

Network Interface Module, for being connected and communicating by letter with the electronic control unit of vehicle electric parking system, described break-in instruction and input or default break-in parameter are sent to described electronic control unit, by described electronic control unit, according to the Parking Brake of described break-in instruction and described break-in parameter control electronic parking system, produce corresponding electronic parking pulling force, thereby the in the situation that of vehicle operating, Parking Brake is carried out to break-in.

2. electric parking brake running-in machine according to claim 1, it is characterized in that: described electric parking brake running-in machine also comprises parking force test device and drg efficiency calculation module, described parking force test device is for testing the parking power of vehicle, and the test value of parking power is outputed to described drg efficiency calculation module, described drg efficiency calculation module is calculated drg efficiency value according to following formula:

Drg efficiency=K* parking power/electronic parking pulling force; Wherein K is the coefficient obtaining by test;

If the drg efficiency value calculating reaches setting value, by described Network Interface Module, to described electronic control unit, send the instruction of exiting break-in.

3. an electronic parking system, comprise connected successively electronic control unit, actr and Parking Brake, it is characterized in that: described electronic control unit is set to be suitable for receiving break-in instruction and break-in parameter, and according to described break-in instruction with described break-in parameter is controlled described actr and Parking Brake produces corresponding electronic parking pulling force, thereby the in the situation that of vehicle operating, described Parking Brake is carried out to break-in.

4. electronic parking system according to claim 3, it is characterized in that: integrated power sensor in electronic parking system, electronic parking pulling force is carried out to Real-Time Monitoring, and described electronic control unit is revised described break-in parameter according to monitored electronic parking pulling force.

5. electronic parking system according to claim 3, it is characterized in that: described electronic control unit was set in the period of adjustment of electric parking brake, when reaching the break-in target component of setting, control described actr and electric parking brake action, exit the period of adjustment, described break-in target component comprises break-in power and break-in distance, described break-in power is that described electronic control unit is controlled the electronic parking pulling force that described Parking Brake produces, described break-in distance is by the distance of the wheel rolling of break-in, after adopting the break-in distance of the break-in power break-in setting of setting, by described electronic control unit, control and exit the period of adjustment.

6. a vehicle, is characterized in that having the electronic parking system as described in any one in claim 3-5.

7. an electric parking brake break-in method, is characterized in that comprising step:

Break-in parameter and break-in instruction are sent to the electronic control unit of vehicle electric parking system;

By described electronic control unit, according to described break-in instruction and described break-in parameter control Parking Brake, produce corresponding electronic parking pulling force, under Vehicular behavior, Parking Brake is carried out to break-in.

8. electric parking brake break-in method according to claim 7, is characterized in that, described break-in parameter comprises break-in target component, in the period of adjustment of Parking Brake, if reach the setting value of described break-in target component, exits the period of adjustment.

9. electric parking brake break-in method according to claim 8, it is characterized in that: described break-in target component comprises break-in power and break-in distance, described break-in power is that described electronic control unit is controlled the electronic parking pulling force that described Parking Brake produces, described break-in distance is by the distance of the wheel rolling of break-in, after adopting the break-in distance of the break-in power break-in setting of setting, by described electronic control unit, control and exit the period of adjustment.

10. electric parking brake break-in method according to claim 8, is characterized in that: also comprise the parking power of vehicle is tested, and according to following formula, drg efficiency value is calculated:

Drg efficiency=K* parking power/electronic parking pulling force; Wherein K is the coefficient obtaining by test;

Described break-in target component adopts drg efficiency value, if the drg efficiency value calculating reaches setting value, to described electronic control unit, sends the instruction of exiting break-in.

11. according to the electric parking brake break-in method described in any one in claim 7-10, it is characterized in that: integrated power sensor in electronic parking system, electronic parking pulling force is carried out to Real-Time Monitoring, and described electronic control unit is revised described break-in parameter according to monitored electronic parking pulling force.

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