Electric control braking system and braking force judgment method

Abstract

The invention provides an electric control braking system and a braking force judgment method. A testing device is used for detecting the clamping force of a brake disc clamped by a brake pad. The testing device comprises a detection rod which is fixedly installed on the brake pad, and the axial direction of the detection rod is consistent with the moving direction of the brake pad; the detector is installed on the inner wall of a shell of the EBS braking system, the detector is provided with a pressure detection part, and the position of the pressure detection part corresponds to that of the detection rod; through the detection rod installed on the brake block, the brake block drives the detection rod to move, the clamping force of the EBS braking system is tested by detecting the thrust of the detection rod, the detection cost can be effectively reduced, and when the cross-shaped detection rod is stressed, the deformation of the detection rod is more local, namely, the detection rod is mainly concentrated on a rod piece parallel to the bending force direction, so that the clamping force of the EBS braking system is greatly reduced. Therefore, the overall bending resistance is improved, and the detection precision is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle EBS brake system testing devices, and in particular to an electronically controlled brake system and a braking force determination method. Background Art

[0002] Testing the clamping force of the EMB brake system is an important measure to ensure braking performance, improve safety and reliability, adapt to different driving modes and road conditions, and meet regulatory and standard requirements. The performance and application value of the EMB system can be further improved by regularly testing and optimizing the clamping force, but it is usually necessary to set up multiple force sensors to detect the clamping force, which increases the cost. Summary of the invention

[0003] The object of the present invention is to solve the above-mentioned problems and to provide an electronically controlled braking system and a braking force determination method.

[0004] The technical solution of this application is implemented as follows:

[0005] In a first aspect, the present application provides an electronically controlled braking system, the braking system comprising a clamping force testing device, the testing device being used to detect the clamping force of a brake pad clamping the brake disc;

[0006] The testing device comprises:

[0007] A detection rod is fixedly mounted on the brake pad, and the axial direction of the detection rod is consistent with the moving direction of the brake pad;

[0008] A detector is installed on the inner wall of the housing of the EBS brake system, and the detector has a pressure detection part, and the pressure detection part corresponds to the position of the detection rod;

[0009] In the standby state of the EBS brake system, the distance between the first end of the detection rod and the pressure detection part is X1;

[0010] The distance between the brake pad and the brake disc is X2, where X1 = X2;

[0011] When the EBS brake system is in a braking state, the brake pad contacts the brake disc, and the detection rod contacts the pressure detection portion.

[0012] In a second aspect, the present application further provides a braking force determination method, the determination method comprising testing a target clamping force of the electronically controlled braking system to determine the braking force of the electronically controlled braking system;

[0013] The testing method adopts the electronically controlled braking system according to any one of claims 1 to 6, and the judging method comprises the following steps:

[0014] S1. Assume that the thrust of the detection rod is F; Assume that the rotation speed of the brake disc is V;

[0015] S2, after the brake system is started, the brake pad is close to the brake disc;

[0016] S3, detecting whether V decreases within a predetermined time T after the brake system enters operation, if yes, proceeding to step S4; otherwise, proceeding to step S6;

[0017] S4, the temperature sensor detects whether the brake pad forms a preset temperature difference within the time T, if yes, proceed to step S5, otherwise proceed to step S6;

[0018] S5, the detector starts to operate, reads the peak pressure F of the pressure detection part during the period from deceleration to complete stop of the brake disc, determines the target clamping force as F1, where F1=F, and determines the braking force F2=F1;

[0019] S6. The brake pad of the braking system moves closer to the brake disc, and detects again whether V decreases within the predetermined time T1. If so, the process returns to step S5. Otherwise, a signal is sent to the prompt system, and the prompt system issues a fault prompt according to the signal.

[0020] The advantages or beneficial effects of the above technical solution include at least:

[0021] By installing a detection rod on the brake pad, the brake pad drives the detection rod to move, and the clamping force of the EBS brake system is tested by detecting the thrust of the detection rod, which can effectively reduce the detection cost. When the "cross"-shaped detection rod is subjected to force, its deformation is often more localized, that is, it is mainly concentrated on the rod parallel to the direction of the bending force, which helps to improve the overall bending resistance and increase the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings illustrate exemplary implementations of the present application of embodiments of the present invention and, together with the description, are used to explain the principles of the present application. These drawings are included to provide a further understanding of the present application, and the drawings are included in and constitute a part of this specification.

[0023] Figure 1 A schematic diagram showing the position of a testing device according to an embodiment of the present invention;

[0024] Figure 2 A schematic diagram showing the position of a detection rod according to an embodiment of the present invention is shown;

[0025] Figure 3 A schematic diagram showing the positions of the detection rod and the guide plate according to an embodiment of the present invention is shown;

[0026] Figure 4A schematic diagram showing the connection relationship between the central processing unit and various sensors in an embodiment of the present invention is shown;

[0027] Reference numerals: 10, EBS brake system; 11, brake pad; 111, detection rod; 112, temperature sensor; 12, brake disc; 13, guide plate; 20, detector; 21, pressure detection unit; 30, central processing unit; 40, brake disc speed sensor; DETAILED DESCRIPTION

[0028] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided for a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be understood that the term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions of other terms will be given in the description below. It should be noted that the concepts of "first", "second", etc. mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] It should be noted that the modifications of "one" and "plurality" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0032] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0033] Reference Figure 1 and Figure 2 , a clamping force testing device for an EBS brake system 10, the testing device being used to detect the clamping force of a brake pad 11 clamping a brake disc 12;

[0034] The test setup includes:

[0035] The detection rod 111 is fixedly mounted on the brake pad 11, and the axial direction of the detection rod 111 is consistent with the moving direction of the brake pad 11. When the EBS brake system 10 is started, the brake pad 11 moves and drives the detection rod 111 to move; the detector 20 is mounted on the inner wall of the housing of the EBS brake system 10, and the detector 20 has a pressure detection part 21, and the pressure detection part 21 corresponds to the position of the detection rod 111. When the EBS brake system 10 is started, the brake pad 11 moves and drives the detection rod 111 to move, so that the end of the detection rod 111 touches the pressure detection part 21 and applies pressure;

[0036] Based on the above, it is assumed that when the EBS brake system 10 is in the standby state, the distance between the first end of the detection rod 111 and the pressure detection part 21 is X1; the distance between the brake pad 11 and the brake disc 12 is X2, wherein X1=X2; to ensure that when the brake pad 11 contacts the brake disc 12, the detection rod 111 will touch the pressure detection part 21, thereby ensuring the accuracy of the pressure detection. Thus, when the EBS brake system 10 is in the braking state, the brake pad 11 contacts the brake disc 12, the detection rod 111 contacts the pressure detection part 21, and the clamping force of the brake pad 11 is detected by the pressure applied by the detection rod 111 to the pressure detection part 21.

[0037] Furthermore, the testing device also includes:

[0038] The central processor 30 is used to collect and process the pressure value fed back by the detector 20 and the information of the speed of the brake disc 12 fed back by the brake disc speed sensor 40; the prompt system is electrically connected to the central processor 30; when the central processor 30 detects that the speed of the brake disc 12 does not drop within the predetermined time T after the brake system is working, a signal is sent to the prompt system, and the prompt system sends a fault prompt according to the signal to determine whether the clamping effect of the EBS brake system 10 meets the qualified standard, and the predetermined time T<0.3S;

[0039] Based on the above, the testing device further includes an end of the detection rod 111 away from the detector 20 embedded in the brake pad 11, and the part of the detection rod 111 extending into the brake pad 11 is equipped with a temperature sensor 112, and the temperature sensor 112 is used to detect the temperature of the brake pad 11; the above-mentioned central processor 30 is further used to collect the temperature data transmitted back by the temperature sensor 112 and process it. At the same time, the temperature detector 20 is installed at the bottom of the detection rod 111, and the detection probe of the temperature detector 20 is in contact with the inner wall of the brake pad 11, and its direction is toward the middle of the brake pad 11 to ensure the accuracy of temperature detection.

[0040] Based on the above structure, the cross section of the detection rod 111 is a "cross" shaped structure, and this shape has extremely high bending stiffness in the direction perpendicular to the detection rod 111. Because when subjected to bending force, the main deformation will be concentrated on the rod parallel to the bending force direction, while the rod perpendicular to the bending force direction can provide a strong support effect, limiting the development of deformation. In addition, when the "cross" shaped rod is subjected to force, its deformation is often more localized, that is, it is mainly concentrated on the rod parallel to the bending force direction, which helps to improve the overall bending resistance, and a guide plate 13 is also installed on the inner wall of the housing of the EBS brake system 10, and the detection rod 111 is movably connected to the guide plate 13, further guiding the moving direction of the detection rod 111, and at the same time, in the process of the detection rod 111 being subjected to force on the pressure detection part 21, the detection rod 111 can be further kept in a vertical state to further avoid bending.

[0041] Preferably, the Rockwell hardness of the detection rod 111 is in the range of 55 to 65, which can maintain the length of the detection rod 111 during multiple tests to prevent it from shrinking, and can also reduce the test error caused by deformation of the material of the detection rod 111.

[0042] An embodiment of the present invention further provides a determination method, the determination method comprising testing a target clamping force of an electronically controlled braking system to determine a braking force of the electronically controlled braking system;

[0043] The test method adopts the electronically controlled braking system according to any one of claims 1 to 6, and the determination method comprises the following steps:

[0044] S1, assuming that the thrust of the detection rod 111 is F; assuming that the rotation speed of the brake disc 12 is V;

[0045] S2, after the brake system is started, the brake pad 11 approaches the brake disc 12;

[0046] S3, detecting whether V decreases within a predetermined time T after the brake system enters operation, if yes, proceeding to step S4; otherwise, proceeding to step S6;

[0047] S4, the temperature sensor 112 detects whether the brake pad 11 forms a preset temperature difference within the time T, the preset temperature difference is 50 degrees Celsius, if yes, then go to step S5, otherwise go to step S6, the temperature judgment is to avoid the situation that the rotation speed of the brake disc 12 decreases during the test process not due to the friction between the brake pad 11 and the brake disc 12, such a situation will cause the error of the target clamping force to increase;

[0048] S5, at this time, the detector 20 starts to operate, and reads the peak pressure F of the pressure detection part 21 during the period from deceleration to complete stop of the brake disc 12, and determines that the target clamping force is F1, where F1=F, and determines that the braking force F2=F1;

[0049] S6. The brake pad 11 of the braking system moves closer to the brake disc 12, and detects again whether V decreases within the predetermined time T1. If so, the process returns to step S5. Otherwise, a signal is sent to the prompt system, and the prompt system issues a fault prompt based on the signal, so that the user can judge whether the braking system has a fault.

[0050] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present application, and are not intended to limit the scope of the present application. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present application.

Claims

1. An electronically controlled braking system, characterized in that: The brake system includes a clamping force testing device; The testing device is used to detect the clamping force of the brake pad (11) clamping the brake disc (12); The testing device comprises: A detection rod (111) is fixedly mounted on the brake pad (11), and the axial direction of the detection rod (111) is consistent with the moving direction of the brake pad (11); A detector (20) is mounted on the inner wall of a housing of the EBS brake system (10), wherein the detector (20) has a pressure detection portion (21), and the pressure detection portion (21) corresponds to the position of the detection rod (111); When the EBS brake system (10) is in a standby state, the distance between the first end of the detection rod (111) and the pressure detection part (21) is X1; The distance between the brake pad (11) and the brake disc (12) is X2, wherein X1=X2; When the EBS brake system (10) is in a braking state, the brake pad (11) contacts the brake disc (12), and the detection rod (111) contacts the pressure detection part (21).

2. The electronically controlled braking system according to claim 1, characterized in that: The testing device also includes: A central processing unit (30) is used to collect and process the pressure value fed back by the detector (20) and the information on the rotation speed of the brake disc (12) fed back by the rotation speed sensor of the brake disc (12); A prompt system, electrically connected to the central processing unit (30); When the central processor (30) detects that the braking system enters a braking state and the rotation speed of the brake disc (12) does not decrease within a predetermined time T, a signal is sent to the prompt system, and the prompt system sends a fault prompt according to the signal; The predetermined time T<0.3S.

3. The electronically controlled braking system according to claim 2, characterized in that: The end of the detection rod (111) away from the detector (20) is embedded in the brake pad (11); The testing device further comprises a temperature sensor (112), wherein the temperature sensor (112) is installed on the portion of the detection rod (111) extending into the brake pad (11), and the temperature sensor (112) is used to detect the temperature of the brake pad (11); The central processor (30) is further used to collect and process the temperature data sent back by the temperature sensor (112).

4. The electronically controlled braking system according to claim 3, characterized in that: The cross section of the detection rod (111) is in a "cross"-shaped structure, and a guide plate (13) is also installed on the inner wall of the housing of the EBS brake system (10), and the detection rod (111) passes through the guide plate (13) and is movably connected to the guide plate (13).

5. The electronically controlled braking system according to claim 4, characterized in that: The Rockwell hardness of the detection rod (111) is in the range of 55 to 65.

6. The electronically controlled braking system according to claim 4, characterized in that: The temperature detector (20) is installed at the bottom of the detection rod (111), and the detection probe of the temperature detector (20) is in contact with the inner wall of the brake pad (11).

7. A method for determining the braking force of an electronically controlled braking system, characterized in that: The determination method includes testing the target clamping force of the electronically controlled braking system to determine the braking force of the electronically controlled braking system; The testing method adopts the electronically controlled braking system according to any one of claims 1 to 6, and the judging method comprises the following steps: S1, assuming that the thrust of the detection rod (111) is F; assuming that the rotation speed of the brake disc (12) is V; S2, after the brake system is started, the brake pad (11) is close to the brake disc (12); S3, detecting whether V decreases within a predetermined time T after the brake system enters operation, if yes, proceeding to step S4; otherwise, proceeding to step S6; S4, the temperature sensor (112) detects whether the brake pad (11) forms a preset temperature difference within the time T, if yes, proceeds to step S5, otherwise proceeds to step S6; S5, the detector (20) starts to operate, reads the peak pressure F of the pressure detection unit (21) during the period from deceleration to complete stop of the brake disc (12), determines the target clamping force as F1, where F1=F, and determines the braking force F2=F1; S6. The brake pad (11) of the braking system moves closer to the brake disc (12), and detects again whether V decreases within the predetermined time T1. If so, the process returns to step S5. Otherwise, a signal is sent to the prompt system, and the prompt system issues a fault prompt according to the signal.

8. The braking force determination method of the electronically controlled braking system according to claim 7, characterized in that: The preset temperature difference is 50 degrees Celsius.

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