A method and device for detecting parking brake force

Abstract

The present invention discloses a method and device for detecting parking brake force, including a roller reaction brake platform, the roller reaction brake platform including a controller, the controller is electrically connected to a control motor, the control motor is connected to a reduction box, and also includes an active roller, a driven roller and a third roller, the active roller is connected to the reduction box, the driven roller is arranged on one side of the active roller, the third roller is arranged between the active roller and the driven roller, and the top of the third roller is lower than the active roller and the driven roller. In the detection method of the present invention, during the detection process, the vehicle to be tested is in a completely stationary state, which meets the actual working conditions of parking; and it is suitable for the detection of mechanical parking and electronic parking; the detection device used in this method can be obtained by upgrading and transforming existing equipment, thereby avoiding the waste of original resources.

Description

Technical Field

[0001] The present invention relates to the technical field of motor vehicle detection, and in particular to a method and device for detecting parking brake force. Background Art

[0002] The existing motor vehicle parking brake force detection is to first start the motor of the roller reaction brake test bench, drive the wheel to rotate through the roller, and when a stable speed is reached, the driver operates the parking (including mechanical parking and electronic parking), and the reaction force of the brake wheel on the roller is used to measure the parking brake force.

[0003] However, the existing detection methods have the following defects and shortcomings:

[0004] 1. Before starting the parking test, the wheel rotation speed is stabilized (i.e. the vehicle is in the forward state), and then the parking test is started. However, for vehicles in daily use, the parking brake is used when the vehicle is in the stopped state to prevent the vehicle from sliding forward or backward; the vehicle is in the process of moving from stationary to moving (i.e. the wheels are in the process of moving from stationary to moving), so the existing method does not conform to the actual situation;

[0005] 2. The existing method has unstable operation of the driver during the manual parking detection process. When the parking handle is pulled up, the speed of the process will affect the parking force detection result;

[0006] 3. Existing methods are not suitable for electronic parking. Some motor vehicles on the market use electronic parking. In order to avoid locking the wheels when parking is started during driving, that is, when the vehicle is not in a stopped state, the electronic parking will not completely lock the wheels. Therefore, the parking braking force is sliding friction, and the pressure is small to avoid locking, so the effective parking force cannot be detected. In addition, some motor vehicles use electronic parking. When parking is started, the wheels are locked. At this time, due to the large parking reaction force instantly applied to the roller, the vehicle will move backward along the roller away from the brake platform. On the one hand, the instantaneous reaction force causes problems with the test accuracy. On the other hand, the movement of the vehicle away from the brake platform causes the post-test process to fail, and there is a safety risk.

[0007] For this reason, since existing methods cannot effectively detect it, the national standard GB38900 exempts small cars with electronic parking from inspection. Summary of the invention

[0008] Based on the technical problems existing in the background technology, the present invention proposes a method and device for detecting parking brake force.

[0009] The present invention proposes a parking brake force detection device, including a roller reaction type brake platform, the roller reaction type brake platform includes a controller, the controller is electrically connected to a control motor, the control motor is connected to a reduction gearbox, and also includes an active roller, a driven roller and a third roller, the active roller is connected to the reduction gearbox, the driven roller is arranged on one side of the active roller, the third roller is arranged between the active roller and the driven roller, and the top of the third roller is lower than the active roller and the driven roller.

[0010] The present invention also proposes a method for detecting parking brake force. Using the above-mentioned parking brake force detection device, the specific detection method includes the following steps:

[0011] S1: Turn on the power of the equipment and start the brake test system;

[0012] S2: The vehicle to be tested enters the roller reaction brake platform;

[0013] S3: The parking axle wheel of the vehicle to be tested stops between the active roller and the driven roller of the roller reaction brake station, and the wheel contacts the third roller. At this time, the vehicle is in a stable state;

[0014] S4: Put the vehicle in neutral, activate the parking brake, and the vehicle instrument displays the parking brake indicator light;

[0015] S5: The brake test system controls the roller reaction brake station to start:

[0016] S6: The controller of the roller reaction brake station controls the motor to start, and the voltage of the motor starts to increase slowly, so that the motor starts to rotate slowly. Since the wheel is in the parking state, the active roller is subjected to the reverse braking force, and the control motor is blocked. The current of the control motor increases, the starting load increases, and the braking force sensor arranged on the active roller is in a force state, and the reaction force of the active roller is continuously detected;

[0017] S7: When the vehicle is just started, the driving force of the control motor is not enough to rotate the wheel. At this time, there is static friction between the wheel and the active roller, that is, the parking brake force. As the voltage and current of the control motor driven by the controller increase, the driving force of the control motor increases, and the static friction also increases;

[0018] S8: The motor driving force reaches the maximum static friction force, that is, the maximum parking brake force. At this time, the braking force sensor measures the maximum reaction force of the active roller, which is the parking brake force.

[0019] S9: After the motor driving force exceeds the maximum static friction force, the third roller detects that the wheel starts to rotate, and the static friction force turns into sliding friction force.

[0020] S10, when the speed of the third roller exceeds the set slip rate, the detection is completed, and the brake test system commands the control motor to stop.

[0021] S11, the detection process is completed, and the parking brake force result and process curve are obtained;

[0022] S12. After the test is completed, the vehicle to be tested drives away from the roller reaction brake platform.

[0023] The detection method of the present invention, during the detection process, the vehicle to be tested is in a completely stationary state, which conforms to the actual working conditions of parking; and is applicable to the detection of mechanical parking and electronic parking; the detection device used in the method can be obtained by upgrading and modifying existing equipment, thereby avoiding the waste of original resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a parking brake force detection device proposed by the present invention;

[0025] Figure 2 A schematic diagram of another parking brake force detection method proposed by the present invention;

[0026] Figure 3 The figure is the parking brake force result and process curve diagram. DETAILED DESCRIPTION

[0027] The present invention will be further explained below in conjunction with specific embodiments.

[0028] The parking brake force detection device proposed in this embodiment is as follows: Figure 1 As shown, it includes a roller reaction brake platform 2, which includes a controller, an active roller 4, a driven roller 3 and a third roller 5. The controller is electrically connected to a control motor, the control motor is connected to a reduction box, the active roller 4 is connected to the reduction box, the driven roller 3 is arranged on one side of the active roller 4, the third roller 5 is arranged between the active roller 4 and the driven roller 3, and the top of the third roller 5 is lower than the active roller 4 and the driven roller 3. When in use, the parking axle wheel 1 of the vehicle to be tested stops between the active roller 4 and the driven roller, and the wheel 1 contacts the third roller 5.

[0029] Using the parking brake force detection device provided by this embodiment, as Figure 2 As shown, the specific detection method is as follows:

[0030] S1: Turn on the power of the equipment and start the brake test system;

[0031] S2: The vehicle to be tested enters the roller reaction brake platform;

[0032] S3: The parking axle wheel of the vehicle to be tested stops between the active roller and the driven roller of the roller reaction brake station, and the wheel contacts the third roller. At this time, the vehicle is in a stable state;

[0033] S4: Put the vehicle in neutral, activate the parking brake, and the vehicle instrument displays the parking brake indicator light;

[0034] S5: The brake test system controls the roller reaction brake station to start:

[0035] S6: The controller of the roller reaction brake station controls the motor to start, and the voltage of the motor starts to increase slowly, so that the motor starts to rotate slowly. Since the wheel is in the parking state, the active roller is subjected to the reverse braking force, and the control motor is blocked. The current of the control motor increases, the starting load increases, and the braking force sensor arranged on the active roller is in a force state, and the reaction force of the active roller is continuously detected;

[0036] S7: When the vehicle is just started, the driving force of the control motor is not enough to rotate the wheel. At this time, there is static friction between the wheel and the active roller, that is, the parking brake force. As the voltage and current of the control motor driven by the controller increase, the driving force of the control motor increases, and the static friction also increases;

[0037] S8: The motor driving force reaches the maximum static friction force, that is, the maximum parking brake force. At this time, the braking force sensor measures the maximum reaction force of the active roller, which is the parking brake force.

[0038] S9: After the motor driving force exceeds the maximum static friction force, the third roller detects that the wheel starts to rotate, and the static friction force turns into sliding friction force.

[0039] S10, when the speed of the third roller exceeds the set slip rate, the detection is completed, and the brake test system commands the control motor to stop.

[0040] S11, the detection process is completed, and the parking brake force result and process curve are obtained, such as Figure 3 As shown;

[0041] S12. After the test is completed, the vehicle to be tested drives away from the roller reaction brake platform.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for detecting parking brake force, the method using a parking brake force detection device, the parking brake force detection device comprising a roller reaction brake platform, the roller reaction brake platform comprising a controller, the controller is electrically connected to a control motor, the control motor is connected to a reduction box, and further comprises an active roller, a driven roller and a third roller, the active roller is connected to the reduction box, the driven roller is arranged on one side of the active roller, the third roller is arranged between the active roller and the driven roller, and the top of the third roller is lower than the active roller and the driven roller, characterized in that Specific detection method The following steps are involved: S1: Turn on the power of the equipment and start the brake test system; S2: The vehicle to be tested enters the roller reaction brake platform; S3: The parking axle wheel of the vehicle to be tested stops between the active roller and the driven roller of the roller reaction brake station, and the wheel contacts the third roller. At this time, the vehicle is in a stable state; S4: Put the vehicle in neutral, activate the parking brake, and the vehicle instrument displays the parking brake indicator light; S5: The brake test system controls the roller reaction brake station to start: S6: The controller of the roller reaction brake station controls the motor to start, and the voltage of the motor starts to increase slowly, so that the motor starts to rotate slowly. Since the wheel is in the parking state, the active roller is subjected to the reverse braking force, and the control motor is blocked. The current of the control motor increases, the starting load increases, and the braking force sensor arranged on the active roller is in a force state, and the reaction force of the active roller is continuously detected; S7: When the vehicle is just started, the driving force of the control motor is not enough to rotate the wheel. At this time, there is static friction between the wheel and the active roller, that is, the parking brake force. As the voltage and current of the control motor driven by the controller increase, the driving force of the control motor increases, and the static friction also increases; S8: The motor driving force reaches the maximum static friction force, that is, the maximum parking brake force. At this time, the braking force sensor measures the maximum reaction force of the active roller, which is the parking brake force. S9: After the motor driving force exceeds the maximum static friction force, the third roller detects that the wheel starts to rotate, and the static friction force turns into sliding friction force; S10, when the speed of the third roller exceeds the set slip rate, the detection is completed, and the brake test system commands the control motor to stop; S11, the detection process is completed, and the parking brake force result and process curve are obtained; S12. After the test is completed, the vehicle to be tested drives away from the roller reaction brake platform.

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