Hardware-in-the-loop vehicle development system and brake system testing method

Abstract

The application provides a hardware-in-the-loop vehicle development system and a brake system test method. The hardware-in-the-loop vehicle development system comprises a front brake disc and a rear brake disc, a front brake caliper and a rear brake caliper, a controller which controls the brake cylinder pressure build-up to make the front brake caliper and the rear brake caliper clamp the front brake disc and the rear brake disc, and a connecting rod connected to the front brake disc and the rear brake disc, an actuator and a transmission mechanism between the actuator and the connecting rod. After the controller detects that the brake cylinder pressure is completely released, the controller controls the actuator to operate to make the connecting rod move, thereby driving the front brake disc and the rear brake disc to rotate to form a gap between the front brake disc and the rear brake disc and the front brake caliper and the rear brake caliper. The device and method according to the embodiment of the application can simulate brake caliper reset to form a gap, so that the test working condition is closer to the use scene of the actual vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle development system, and more particularly, to a development system capable of realizing automatic reset of brake caliper. BACKGROUND

[0002] In recent years, the automobile technology develops rapidly, and the proportion of electrical components in the whole vehicle is higher and higher. The automobile industry has rapidly entered the era of intelligent development, and the complexity of the electronic control system is higher and higher. The development and testing requirements of the control software are also higher and higher.

[0003] The chassis brake control system based on the brake system hardware-in-the-loop is an important development and testing means. The vehicle dynamics characteristics are simulated by software simulation. The hardware-in-the-loop brake system includes all related hardware and hydraulic pipelines, and can test the function of the brake system.

[0004] After releasing the brake on the actual vehicle, the rotation of the wheel makes the brake disc and the friction plate produce elastic deformation to reset the caliper and form a gap. The existing test bench includes a dynamic bench and a static bench. The dynamic bench needs to use an independent motor to control the rotation of each wheel to drive the rotation of the brake disc, which completely simulates the rotation state of the actual vehicle. The disadvantages are high cost, complex structure, and real-time control of multiple motors. The brake disc of the static bench is always stationary, and the brake disc and the friction plate cannot produce elastic deformation, so the caliper cannot be reset to form a gap, which affects the simulation of the actual vehicle clamping force action process. In the performance test, the test of the brake system clamping action time and the initial clamping force of the brake system cannot be guaranteed. SUMMARY

[0005] The present application aims to solve or at least alleviate the problems existing in the prior art.

[0006] In one aspect, a hardware-in-the-loop vehicle development system is provided, comprising:

[0007] a front brake disc and a rear brake disc capable of rotating around respective pivot axes, respectively;

[0008] a front brake caliper and a rear brake caliper acting on the front brake disc and the rear brake disc, respectively;

[0009] a controller controlling the brake cylinder to build pressure so that the front brake caliper and the rear brake caliper clamp the front brake disc and the rear brake disc;

[0010] The hardware-in-the-loop vehicle development system further comprises a connecting rod connected to the front brake disc and the rear brake disc.

[0011] an actuator connected to the controller; and

[0012] a transmission mechanism between the actuator and the connecting rod;

[0013] wherein the controller controls the actuator to operate to move the connecting rod to thereby drive the front brake disc and the rear brake disc to rotate to form the gap between the front brake disc and the rear brake disc and the front brake caliper and the rear brake caliper after detecting that the brake cylinder pressure is completely released.

[0014] Optionally, in the embodiment of the hardware-in-the-loop vehicle development system, the connecting rod is connected at corresponding positions of outer edges of the front brake disc and the rear brake disc.

[0015] Optionally, in the embodiment of the hardware-in-the-loop vehicle development system, the connecting rod is connected to the front brake disc and the rear brake disc through a rotating pin.

[0016] Optionally, in the embodiment of the hardware-in-the-loop vehicle development system, the actuator is a linear actuator.

[0017] Optionally, in the embodiment of the hardware-in-the-loop vehicle development system, the actuator comprises a solenoid valve and a push rod connected to the solenoid valve.

[0018] Optionally, in the embodiment of the hardware-in-the-loop vehicle development system, the controller controls the linear actuator to reciprocate multiple times after detecting that the brake cylinder pressure is completely released.

[0019] Optionally, in the embodiment of the hardware-in-the-loop vehicle development system, the transmission mechanism comprises a rocker arm, a middle portion of the rocker arm is rotatably connected to a pivot shaft, a first end of the rocker arm is connected to the actuator, and a second end of the rocker arm is connected to a middle portion of the connecting rod.

[0020] Optionally, in the embodiment of the hardware-in-the-loop vehicle development system, the first end and the second end of the rocker arm are provided with waist-shaped sliding grooves, an end portion of the actuator and the middle portion of the connecting rod are respectively provided with sliding blocks matched to the corresponding waist-shaped sliding grooves, and the sliding blocks are pivotably connected to the end portion of the actuator and the middle portion of the connecting rod.

[0021] In another aspect, a brake system testing method is provided, which is based on the hardware-in-the-loop vehicle development system according to the embodiment, and the method comprises: controlling an actuator to operate to move a connecting rod to thereby drive a front brake disc and a rear brake disc to rotate to form a gap between the front brake disc and the rear brake disc and a front brake caliper and a rear brake caliper after detecting that a brake cylinder pressure is completely released.

[0022] Optionally, the method further comprises causing the actuator to reciprocate the connecting rod multiple times.

[0023] The device and method according to the embodiments of the present application only need to make simple modification to the existing static bench to simulate brake caliper reset to form a gap, so that the test working condition is closer to the use scene of the real vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0024] The disclosure of the present application will become more fully understood from the detailed description given herein below, and appended claims, accompanied by the accompanying drawings. It is to be understood that the drawings are only for the purpose of illustration, and are not intended to limit the scope of the present application in any way. Furthermore, like reference numerals are intended to represent similar components throughout the figures. It should be noted that the size of some of the elements, including the size of the various components, are meant to be illustrative only and

[0025] Figure 1 A structural schematic diagram of a vehicle development system according to an embodiment of the present application is shown;

[0026] Figure 2 A flow chart of a method according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0027] REFERENCE Figure 1To introduce the vehicle development system according to the embodiment of the present application. The vehicle development system is a hardware-in-the-loop vehicle development system, which provides an integrated solution based on the brake system hardware-in-the-loop development test bench to realize the gap formed by the reset of the brake caliper. The hardware-in-the-loop vehicle development system generally comprises a control cabinet 1 and a wet cabinet body 4. The control cabinet 1 comprises a controller 11 and a controller 12, which are connected to a brake control module 7 and an actuator 8 through a first line 2 and a second line 3 respectively, so as to control the operation of the brake caliper and the actuator respectively, and feed back information such as brake cylinder pressure to the control cabinet 1. The wet cabinet body 4 comprises: a front brake disc 53 and a rear brake disc 54 which can rotate around respective pivot axes 51, 52; a front brake caliper 62 and a rear brake caliper 61 which act on the front brake disc 53 and the rear brake disc 54 respectively; a connecting rod 10 connected to the front brake disc 53 and the rear brake disc 54; the actuator 8 connected to the controller 12; and a transmission mechanism 9 between the actuator 8 and the connecting rod 10. The controller in the control cabinet 1 controls the build-up of the brake cylinder pressure to make the front brake caliper 62 and the rear brake caliper 61 clamp the front brake disc 53 and the rear brake disc 54. In addition, after detecting that the brake cylinder pressure is completely released, the controller controls the operation of the actuator 8, moves the connecting rod 10 through the transmission mechanism 9, thereby driving the front brake disc 53 and the rear brake disc 54 to rotate, to form the gap between the front brake disc 53 and the rear brake disc 54 and the front brake caliper 62 and the rear brake caliper 61. The system according to the embodiment of the present application adds components such as the actuator 8, the transmission mechanism 9 and the connecting rod 10 in the static test bench, so that the front brake disc 53 and the rear brake disc 54 can rotate back and forth, to realize the reset of the front brake caliper 62 and the rear brake caliper 61 and form the gap between the brake disc and the brake caliper, thereby meeting the brake clamping time and the initial clamping force of the brake system, and making the test working condition closer to the use scenario of the real vehicle.

[0028] In some embodiments, as shown, the connecting rod 10 is connected at corresponding positions on the outer edges of the front brake disc 53 and the rear brake disc 54, for example, as shown, at the lower parts of the front brake disc 53 and the rear brake disc 54 close to the lowest positions, so that the movements of the front brake disc 53 and the rear brake disc 54 are synchronized. In alternative embodiments, the connecting rod 10 can also be connected at other suitable positions on the front brake disc 53 and the rear brake disc 54, for example, positions closer to the center of the circle, or the top parts of the front brake disc 53 and the rear brake disc 54. In some embodiments, the connecting rod 10 is pivotably connected to the front brake disc 53 and the rear brake disc 54 through rotating pins 102, 101.

[0029] In some embodiments, the actuator 8 can be a linear actuator. For example, in some embodiments, the actuator comprises a solenoid valve 81 and a push rod 82 connected to the solenoid valve 81. The reciprocating linear motion of the push rod 82 is achieved by electrically exciting the opening and closing of the solenoid valve 81. In other embodiments, the actuator can also be a rotary actuator, such as a motor, etc., in which case the transmission mechanism also needs to be redesigned, for example, including a gear set that reduces speed and increases torque, etc. In some embodiments, after the controller 1 detects that the brake cylinder pressure is completely released, the linear actuator is controlled to reciprocate, so that the connecting rod 10 reciprocates multiple times, thereby ensuring that the front brake disc 53 and the rear brake disc 54 form a sufficient gap with the calipers.

[0030] In some embodiments, the transmission mechanism 9 comprises a rocker arm 90, the middle part of the rocker arm is rotatably connected to a pivot shaft 91, the first end of the rocker arm is connected to the actuator, and the second end of the rocker arm is connected to the middle part of the connecting rod 10. In some embodiments, the first end and the second end of the rocker arm are provided with a waist-shaped sliding groove 92, 93, and the end of the actuator and the middle part of the connecting rod are respectively provided with a sliding block 822, 104 that fits into the corresponding waist-shaped sliding groove 92, 93, the sliding block 822, 104 is rotatably connected to the end of the actuator and the middle part of the connecting rod through the pivot shaft, thereby realizing the conversion of the motion of the transmission mechanism to the connecting rod. In alternative embodiments, other suitable transmission mechanisms can be used, including but not limited to transmission mechanisms based on cranks, gears, etc.

[0031] With reference to the foregoing, it will be understood that the embodiments described herein are susceptible to various modifications and alternative forms, specific examples thereof having been shown by way of example in the drawings and are therefore within the scope of the disclosure. Indeed, the specific therapeutic and / or prophylactic regimens set forth herein can be suspended, delayed, repeated or otherwise modified, as appropriate. The disclosure is to be understood as encompassing all such variations and modifications unless otherwise indicated herein. Figure 2 wherein a test method according to embodiments of the present application is shown. The brake system test method according to embodiments of the present application is based on a hardware-in-the-loop vehicle development system according to embodiments, the method comprising: upon detecting that the brake system completely releases the calipers, for example based on brake cylinder pressure, controlling the actuator to operate to move the connecting rod through the transmission mechanism, thereby driving the front brake disc and the rear brake disc to rotate, thereby forming a gap between the front brake disc and the rear brake disc and the front brake caliper and the rear brake caliper. In specific embodiments, the solenoid valve push rod pushes the rocker arm to rotate, the rotation of the rocker arm further pushes the connecting rod to move, thereby driving the front brake disc and the rear brake disc to rotate. In some embodiments, the method further comprises reciprocating the connecting rod multiple times by the actuator, thereby ensuring the resetting effect of the calipers.

[0032] The device and method according to the present application are suitable for application in the hardware-in-the-loop bench development test of the disc brake chassis brake control system, using the existing resources of the bench, adding mechanical mechanisms such as solenoid valves, solenoid valve push rods, rocker arms, connecting rods, etc. and measurement and control circuits to realize the resetting of the brake calipers and the formation of the gap, thereby meeting the brake clamping time and the initial clamping force of the brake system closer to the use scenario of the real vehicle, meeting the needs of the brake system brake response and clamping force development test and calibration based on the bench.

[0033] The specific embodiments described hereinabove are presented for purposes of more completely and clearly describing the present application and its best mode. They are not intended to limit the scope of the application. One skilled in the art will be able to devise numerous alternative modifications to the specific embodiments described herein without departing from the scope of the present application. These and other modifications are therefore intended to be included within the scope of the present application. The scope of the application should be determined by the following claims.

Claims

1. A hardware-in-the-loop vehicle development system, comprising: a front brake disc and a rear brake disc rotatable about respective pivot axes; a front brake caliper and a rear brake caliper acting on the front brake disc and the rear brake disc, respectively; a controller controlling brake cylinder pressure to cause the front brake caliper and the rear brake caliper to clamp the front brake disc and the rear brake disc; characterized in that the hardware-in-the-loop vehicle development system further comprises: a connecting rod connected to the front brake disc and the rear brake disc; an actuator connected to the controller; and a transmission mechanism between the actuator and the connecting rod; 2. The hardware-in-the-loop vehicle development system of claim 1, wherein, wherein the controller controls the actuator to operate to move the connecting rod, thereby causing the front brake disc and the rear brake disc to rotate to form a gap between the front brake disc and the rear brake disc and the front brake caliper and the rear brake caliper after detecting that the brake cylinder pressure is completely released.

3. The hardware-in-the-loop vehicle development system of claim 2, wherein, The connecting rod is connected at corresponding positions on outer edges of the front brake disc and the rear brake disc.

4. The hardware-in-the-loop vehicle development system of claim 1, wherein, The connecting rod is connected to the front brake disc and the rear brake disc by a rotating pin.

5. The hardware-in-the-loop vehicle development system of claim 4, wherein, The actuator is a linear actuator.

6. The hardware-in-the-loop vehicle development system of claim 4, wherein, The actuator comprises a solenoid valve and a push rod connected to the solenoid valve.

7. The hardware-in-the-loop vehicle development system of any one of claims 1-6, wherein, The controller controls the linear actuator to reciprocate multiple times after detecting that the brake cylinder pressure is completely released.

8. The hardware-in-the-loop vehicle development system of claim 7, wherein, The transmission mechanism comprises a rocker arm, a middle portion of the rocker arm being rotatably connected to a pivot shaft, a first end of the rocker arm being connected to the actuator, and a second end of the rocker arm being connected to a middle portion of the connecting rod.

9. A brake system testing method based on the hardware-in-the-loop vehicle development system of any one of claims 1-8, the method comprising: The first end and the second end of the rocker arm are provided with waist-shaped sliding grooves, an end portion of the actuator and the middle portion of the connecting rod are each provided with a slider fitted into a corresponding waist-shaped sliding groove, and the slider is pivotably connected to the end portion of the actuator and the middle portion of the connecting rod.

10. The method of claim 9, wherein, The method further comprises causing the actuator to reciprocate the connecting rod multiple times. The method further comprises causing the actuator to reciprocate the connecting rod multiple times.

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