Caliper parameter calibration method and device

Abstract

The present invention relates to the technical field of parameter calibration, and provides a caliper parameter calibration method and device, the method comprising the following steps: when the caliper is undergoing a bench test, if a caliper fault is reported, then the working parameters of the caliper in the current test are read, including the current and current of the caliper drive motor; the fault type of the caliper in the current test is read, and the working parameters of the stage where the fault type is located are extracted from the working parameters of the current test: the extracted working parameters are analyzed, and if the fault is caused by unreasonable calibration parameter settings of the corresponding stage, a calibration parameter modification prompt for the stage where the fault is located is issued. The rationality of the calibration parameters is analyzed for the extracted working parameters, and a calibration parameter adjustment prompt is issued for the fault caused by unreasonable calibration parameter settings.

Description

Technical Field

[0001] The invention relates to the technical field of parameter calibration and provides a caliper parameter calibration method and device. Background Art

[0002] In the electronic parking brake system (EPB) of modern automobiles, the caliper is an important component of the electronic parking brake system. In order to improve the braking performance and reliability of the caliper, the relevant parameters must be accurately calibrated. Accurate calibration of parameters is an important part of ensuring the normal operation and safety of the caliper. The EPB system controls the motor to drive the caliper through the electronic control unit (ECU), thereby performing braking and releasing actions.

[0003] Currently, the calibration method of calipers usually relies on manual testing and adjustment of vehicles in the laboratory. The laboratory testing method measures the working performance of the caliper in a fixed test environment and adjusts the calibration parameters according to the test results, which mainly relies on manual experience.

[0004] The laboratory testing method requires multiple tests under different working conditions, which is a cumbersome and time-consuming process. In addition, the ability to identify caliper failures that occur during the parameter calibration process is insufficient. Once a failure occurs, it can often only be diagnosed manually, and the calibration parameters cannot be adjusted in a timely manner based on the caliper failure. Summary of the invention

[0005] In view of this, the present application provides a caliper parameter calibration method, aiming to improve the above-mentioned problem.

[0006] Specifically, the following technical solutions are included:

[0007] On the one hand, an embodiment of the present application provides a caliper parameter calibration method, the method comprising the following steps:

[0008] (1) When the caliper is undergoing a bench test, if a caliper fault is reported, read the caliper's working parameters for the current test, including the current and current of the caliper drive motor.

[0009] (2) Read the fault type of the caliper in the current test, and extract the working parameters of the stage where the fault type is located from the working parameters of the current test:

[0010] (3) The extracted working parameters are analyzed. If the fault is caused by unreasonable calibration parameter settings at the corresponding stage, a calibration parameter modification prompt for the stage where the fault occurs is issued.

[0011] In some embodiments of the present invention, the caliper collects and records the working parameters of the caliper in real time during the process of executing the clamping action and the releasing action, performs various fault detections in the corresponding stages based on the calibration parameters of each stage of the clamping action and the releasing action, and records the fault identification of the fault type. When a fault is detected in the caliper, a caliper fault is reported.

[0012] In some embodiments of the present invention, during the clamping action, the fault detection process based on the caliper drive motor current is specifically as follows:

[0013] Clamping start stage; if the current is lower than the first current lower limit value, it is determined that there is a clamping start fault caused by too low starting current;

[0014] Clamping idling stage: If the current deviates from the set first current value, or the current fluctuates too much around the first current value, it is determined that the caliper advancement failure is caused by the abnormal current;

[0015] Clamping stage: calculate the duration from the appearance of the clamping mark to the appearance of the clamping completion mark. If the duration is greater than the set first time threshold, it is determined that there is a caliper clamping amplification fault caused by abnormal current fluctuation.

[0016] In some embodiments of the present invention, during the clamping action, the fault detection process based on the caliper drive motor voltage is specifically as follows:

[0017] If the voltage exceeds the voltage range consisting of the lower voltage limit and the upper voltage limit at the beginning of clamping, it is determined as a clamping start-up failure caused by abnormal voltage; if the voltage exceeds the voltage range at the clamping idling stage, it is determined as a caliper advancement failure caused by abnormal voltage; if the voltage exceeds the voltage range at the clamping stage, it is determined as a caliper clamping amplification failure caused by abnormal voltage.

[0018] In some embodiments of the present invention, after the clamping start identification position appears, the caliper enters the clamping start stage, after the clamping idling identification position appears, the caliper enters the clamping idling stage, and after the clamping identification position appears, the caliper enters the clamping stage.

[0019] In some embodiments of the present invention, during the release action, the fault detection process based on the current of the caliper drive motor is specifically as follows:

[0020] Release start stage; if the current is lower than the second current lower limit, it is determined to be a release start failure caused by too low starting current;

[0021] Release stage: Calculate the time from the appearance of the release mark to the appearance of the release idling mark. If the time is greater than the set second time threshold, it is determined that there is a caliper clamping reduction fault caused by abnormal current fluctuation;

[0022] Release idling stage: If the current deviates from the set second current value, or the current fluctuates too much around the second current value, it is determined that the caliper push-out failure is caused by the abnormal current.

[0023] In some embodiments of the present invention, during the release action, the fault detection process based on the caliper drive motor voltage is specifically as follows:

[0024] If the voltage exceeds the voltage range consisting of the lower voltage limit and the upper voltage limit during the release start stage, it is determined as a release start failure caused by voltage abnormality; if the voltage exceeds the voltage range during the release stage, it is determined as a caliper release reduction failure caused by voltage abnormality; if the voltage exceeds the voltage range during the release idling stage, it is determined as a caliper push-out failure caused by voltage abnormality.

[0025] In some embodiments of the present invention, after a release start identification position appears, the caliper enters a release start phase; after a release identification position appears, the caliper enters a release phase; after a release idling identification position appears, the caliper enters a release idling phase.

[0026] In some embodiments of the present invention, the amplitude of the working parameter deviation from the calibration parameter is detected. If the amplitude is less than the set corresponding amplitude threshold, it is determined that the fault is caused by unreasonable calibration parameter setting, and a calibration parameter modification prompt for the stage where the fault occurs is issued.

[0027] On the other hand, an embodiment of the present application provides a caliper parameter calibration device, the device comprising:

[0028] A data reading unit, a data analyzing unit connected to the data reading unit, and an output unit connected to the data analyzing unit;

[0029] When the caliper to be calibrated is undergoing a bench test, if a caliper fault is reported, the data reading unit reads the working parameters of the caliper in the current test, including the current and current of the caliper drive motor, and sends them to the data analysis unit. The data analysis unit performs a rationality analysis on the calibration parameters of the caliper based on the above-mentioned caliper parameter calibration method, and issues relevant prompts through the output unit.

[0030] During the bench test of the caliper, when a caliper fault is reported, the present invention reads the working parameters of the caliper in the current test, automatically extracts the working parameters corresponding to the fault based on the fault type, performs a rationality analysis of the calibration parameters on the extracted working parameters, and issues a calibration parameter adjustment prompt for the fault caused by unreasonable calibration parameter settings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A flow chart of a caliper parameter calibration method provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the structure of a caliper parameter calibration device provided in an embodiment of the present invention;

[0034] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0037] Figure 1 A flow chart of a caliper parameter calibration method provided by an embodiment of the present invention, the method comprising the following steps:

[0038] (1) When the caliper is undergoing a bench test, if a caliper fault is reported, the working parameters of the caliper in the current test are read, mainly including the current and current of the caliper drive motor, which is used to drive the caliper closer to or away from the brake disc.

[0039] In an embodiment of the present invention, a fault-free caliper is selected for bench testing. In each test, the caliper performs a clamping action and a releasing action, wherein the clamping action is divided into four stages, namely the caliper start clamping stage, the clamping process stage, the continued clamping stage and the clamping completion stage, and the threshold values ​​corresponding to the working parameters of the four stages are called calibration parameters, which are pre-set. The releasing action is also divided into four stages, namely the start release stage, the release process stage, the release completion stage and the full release stage, and the threshold values ​​corresponding to the working parameters of the four stages are called calibration parameters, which are pre-set.

[0040] During the clamping and releasing processes, the caliper collects and records the working parameters of the caliper in real time. Based on the calibration parameters of each stage of the clamping and releasing actions, various fault detections are performed at the corresponding stages, and the fault identification of the fault type is recorded. When a fault is detected in the caliper, a caliper fault is reported.

[0041] (2) Read the fault type of the caliper in the current test, and extract the working parameters of the stage where the fault type is located from the working parameters of the current test:

[0042] In an embodiment of the present invention, after the clamping start identification position appears, the caliper enters the clamping start stage, after the clamping idling identification position appears, the caliper enters the clamping idling stage, after the clamping identification position appears, the caliper enters the clamping stage, and after the clamping completion identification position appears, the caliper enters the clamping completion stage.

[0043] In the embodiment of the present invention, there are two types of faults in the four stages corresponding to the clamping action, a first fault type caused by abnormal current and current change, and a second fault type caused by abnormal voltage, wherein the first fault type specifically includes:

[0044] (a) Clamping start stage: The motor starts to be powered on. If the current is lower than the first current lower limit value (calibration parameter), it is determined that there is a clamping start fault caused by too low starting current;

[0045] (b) Clamping and idling stage: Eliminate the gap between the caliper and the brake disc. At this time, the current should fluctuate around the set first current value (calibration parameter) to control the caliper to move closer to the brake disc. If the current fluctuation is too large, it is determined that the caliper advances due to abnormal current.

[0046] (c) Clamping stage: After the gap between the caliper and the brake disc is eliminated, the caliper begins to clamp the brake disc. The current in this stage shows a fluctuating upward trend. If the current fluctuation exceeds expectations, it will take too long to complete the clamping stage. At this time, the time from the appearance of the clamping mark to the appearance of the clamping completion mark is calculated. If the time is greater than the set first time threshold (calibration parameter), it is determined that there is a caliper clamping amplification fault caused by abnormal current fluctuation;

[0047] (d) Clamping completion stage: the current is cut off.

[0048] In this embodiment of the present invention, the caliper monitors the voltage of the motor during the clamping action, and the second fault type specifically includes:

[0049] If the voltage exceeds the voltage range (calibration parameters) composed of the lower voltage limit and the upper voltage limit in the clamping start stage, it is determined as a clamping start failure caused by abnormal voltage; if the voltage exceeds the voltage range composed of the lower voltage limit and the upper voltage limit in the clamping idling stage, it is determined as a caliper advancement failure caused by abnormal voltage; if the voltage exceeds the voltage range composed of the lower voltage limit and the upper voltage limit in the clamping stage, it is determined as a caliper clamping amplification failure caused by abnormal voltage.

[0050] After the release start identification position appears, the caliper enters the release start stage; after the release identification position appears, the caliper enters the release stage; after the release idling identification position appears, the caliper enters the release idling stage; after the release tight completion identification position appears, the caliper enters the release completion stage.

[0051] In the embodiment of the present invention, there are two types of faults in the four stages corresponding to the release action, a third fault type caused by current abnormality and current change, and a fourth fault type caused by voltage abnormality, wherein the third fault type specifically includes:

[0052] (e) Release start stage: The motor starts to be powered on. If the current is lower than the second current lower limit value (calibration parameter), it is determined to be a release start fault caused by too low starting current;

[0053] (f) Release stage: The caliper begins to release. The current in this stage shows a fluctuating downward trend. If the current fluctuation exceeds expectations, it will take too long to complete the release stage. At this time, the time from the appearance of the release mark to the appearance of the release idling mark is calculated. If the time is greater than the set second time threshold (calibration parameter), it is determined that there is a caliper clamping reduction fault caused by abnormal current fluctuation;

[0054] (g) Release idling stage: Push the caliper away from the brake disc. At this time, the current should fluctuate around the set second current value (calibration parameter), and control the caliper to move closer to the brake disc. If the current fluctuation is too large, it is determined that the caliper push-out failure is caused by abnormal current;

[0055] (h) Release completion stage: the current is cut off.

[0056] In this embodiment of the present invention, the caliper monitors the voltage of the motor during the release action, and the fourth fault type specifically includes:

[0057] If the voltage exceeds the voltage range consisting of the lower voltage limit and the upper voltage limit during the release start stage, it is determined to be a release start failure caused by voltage abnormality; if the voltage exceeds the voltage range consisting of the lower voltage limit and the upper voltage limit during the release stage, it is determined to be a caliper release reduction failure caused by voltage abnormality; if the voltage exceeds the voltage range consisting of the lower voltage limit and the upper voltage limit during the release idling stage, it is determined to be a caliper push-out failure caused by voltage abnormality.

[0058] (3) The extracted working parameters are analyzed. If the fault is caused by unreasonable calibration parameter settings at the corresponding stage, a modification prompt for the calibration parameters at the stage where the fault occurs is issued.

[0059] Since the initial calibration parameters are directly read from a similar model of the vehicle where the current caliper is located or are set by technicians based on experience, the initial calibration parameters cannot fully adapt to the model of the vehicle where the current caliper is located. Therefore, the calibration parameters of the caliper need to be adjusted.

[0060] In an embodiment of the present invention, when there are first and third type faults, the current data of the corresponding stage is extracted; if there are second and fourth type faults, the voltage data of the corresponding stage is extracted, the extracted working parameters are analyzed, and the amplitude of the working parameters deviating from the calibration parameters is detected. If the amplitude is less than the set corresponding amplitude threshold, it is determined that the fault is caused by unreasonable setting of the calibration parameters, and a calibration parameter modification prompt for the stage where the fault is located is issued. After modification, the calibration parameters should include the working parameters within the normal working parameter range. If the amplitude is greater than the set corresponding amplitude threshold, the cause of the fault cannot be determined at this time, and manual intervention is required to determine whether the calibration parameters of the stage where the fault is located need to be modified.

[0061] During the bench test of the caliper, when a caliper fault is reported, the present invention reads the working parameters of the caliper in the current test, automatically extracts the working parameters corresponding to the fault based on the fault type, performs a rationality analysis of the calibration parameters on the extracted working parameters, and issues a calibration parameter adjustment prompt for the fault caused by unreasonable calibration parameter settings.

[0062] Figure 2 The structure of the caliper parameter calibration device provided in the embodiment of the present invention is schematically shown. For the convenience of description, only the part related to the embodiment of the present invention is shown. The device includes:

[0063] A data reading unit, a data analyzing unit connected to the data reading unit, and an output unit connected to the data analyzing unit;

[0064] When the caliper to be calibrated is undergoing a bench test, if a caliper fault is reported, the data reading unit reads the working parameters of the caliper in the current test, including the current and current of the caliper drive motor, and sends them to the data analysis unit. The data analysis unit performs a rationality analysis on the calibration parameters of the caliper based on the above-mentioned caliper parameter calibration method, and issues relevant prompts through the output unit.

[0065] During the bench test of the caliper, when a caliper fault is reported, the present invention reads the working parameters of the caliper in the current test, automatically extracts the working parameters corresponding to the fault based on the fault type, performs a rationality analysis of the calibration parameters on the extracted working parameters, and issues a calibration parameter adjustment prompt for the fault caused by unreasonable calibration parameter settings.

[0066] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0067] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A caliper parameter calibration method, characterized in that: The method comprises the following steps: (1) When the caliper is undergoing a bench test, if a caliper fault is reported, read the caliper's operating parameters for the current test, including the current and current of the caliper drive motor; (2) Read the fault type of the caliper in the current test, and extract the working parameters of the stage where the fault type is located from the working parameters of the current test: (3) The extracted working parameters are analyzed. If the fault is caused by unreasonable calibration parameter settings at the corresponding stage, a calibration parameter modification prompt for the stage where the fault occurs is issued.

2. The caliper parameter calibration method according to claim 1, characterized in that: During the clamping and releasing processes, the caliper collects and records the working parameters of the caliper in real time. Based on the calibration parameters of each stage of the clamping and releasing actions, various fault detections are performed at the corresponding stages, and the fault identification of the fault type is recorded. When a fault is detected in the caliper, a caliper fault is reported.

3. The caliper parameter calibration method according to claim 2, characterized in that: During the clamping action, the fault detection process based on the caliper drive motor current is as follows: Clamping start stage; if the current is lower than the first current lower limit value, it is determined that there is a clamping start fault caused by too low starting current; Clamping idling stage: If the current deviates from the set first current value, or the current fluctuates too much around the first current value, it is determined that the caliper advancement failure is caused by the abnormal current; Clamping stage: calculate the duration from the appearance of the clamping mark to the appearance of the clamping completion mark. If the duration is greater than the set first time threshold, it is determined that there is a caliper clamping amplification fault caused by abnormal current fluctuation.

4. The caliper parameter calibration method according to claim 2, characterized in that: During the clamping action, the fault detection process based on the caliper drive motor voltage is as follows: If the voltage exceeds the voltage range consisting of the lower voltage limit and the upper voltage limit at the beginning of clamping, it is determined as a clamping start-up failure caused by abnormal voltage; if the voltage exceeds the voltage range at the clamping idling stage, it is determined as a caliper advancement failure caused by abnormal voltage; if the voltage exceeds the voltage range at the clamping stage, it is determined as a caliper clamping amplification failure caused by abnormal voltage.

5. The caliper parameter calibration method according to claim 3 or 4, characterized in that: After the clamping start mark appears, the caliper enters the clamping start stage, after the clamping idling mark appears, the caliper enters the clamping idling stage, and after the clamping mark appears, the caliper enters the clamping stage.

6. The caliper parameter calibration method according to claim 2, characterized in that: During the release action, the fault detection process based on the current of the caliper drive motor is as follows: Release start stage; if the current is lower than the second current lower limit, it is determined to be a release start failure caused by too low starting current; Release stage: Calculate the time from the appearance of the release mark to the appearance of the release idling mark. If the time is greater than the set second time threshold, it is determined that there is a caliper clamping reduction fault caused by abnormal current fluctuation; Release idling stage: If the current deviates from the set second current value, or the current fluctuates too much around the second current value, it is determined that the caliper push-out failure is caused by the abnormal current.

7. The caliper parameter calibration method according to claim 2, characterized in that: During the release action, the fault detection process based on the caliper drive motor voltage is as follows: If the voltage exceeds the voltage range consisting of the lower voltage limit and the upper voltage limit during the release start stage, it is determined as a release start failure caused by voltage abnormality; if the voltage exceeds the voltage range during the release stage, it is determined as a caliper release reduction failure caused by voltage abnormality; if the voltage exceeds the voltage range during the release idling stage, it is determined as a caliper push-out failure caused by voltage abnormality.

8. The caliper parameter calibration method according to claim 6 or 7, characterized in that: After the release start identification position appears, the caliper enters the release start stage; after the release identification position appears, the caliper enters the release stage; after the release idling identification position appears, the caliper enters the release idling stage.

9. The caliper parameter calibration method according to claim 1, characterized in that: The amplitude of the working parameter deviation from the calibration parameter is detected. If the amplitude is less than the corresponding amplitude threshold, it is determined that the fault is caused by unreasonable calibration parameter setting, and a calibration parameter modification prompt for the stage where the fault occurs is issued.

10. A caliper parameter calibration device, characterized in that: The device comprises: A data reading unit, a data analyzing unit connected to the data reading unit, and an output unit connected to the data analyzing unit; When the caliper to be calibrated is undergoing a bench test, if a caliper fault is reported, the data reading unit reads the working parameters of the caliper in the current test, including the current and current of the caliper drive motor, and sends them to the data analysis unit. The data analysis unit performs a rationality analysis on the calibration parameters of the caliper based on the caliper parameter calibration method described in any one of claims 1 to 9, and issues relevant prompts through the output unit.

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