Method for detecting a needle of an automobile instrument

Abstract

The automobile instrument pointer pressing needle detection method belongs to the field of pneumatic pressure pointer. The existing pressing needle detection method has the problems of low accuracy of maximum pressure value acquisition, inability to accurately determine whether the pressing needle process is abnormal, and inability to accurately determine whether the automobile instrument is damaged after pressing. The present application first obtains the demarcation time by using the first pressure curve, divides the second pressure curve at the demarcation time, forms the joint stage and the pressing stage, obtains the maximum pressure value of each stage, and performs abnormality judgment and instrument damage judgment. The present application is mainly used for detecting the pressing needle process of the automobile instrument pointer.

Description

Technical Field

[0001] This invention belongs to the field of pneumatic pressure gauges. Background Technology

[0002] Currently, there is a misconception in the automotive electronics industry regarding the maximum pressure value of instrument panel pointers during installation. It is generally believed that the maximum value during the pressing process refers to the highest pressure value among the collected pressure data. However, existing indentation testing methods consistently fail to obtain the maximum value during the indentation process. Specifically:

[0003] ①The PLC will obtain a data acquisition V (sensor pressure) every time it runs one cycle (a few milliseconds).

[0004] ②The PLC will store the acquired data V into the data register D100.

[0005] ③The computer software reads D100 data from the PLC every 100ms.

[0006] While this method acquires data quickly, it still misses data from 0 to 99 ms. This 0-99 ms period may contain the maximum pressure value, affecting the accuracy of obtaining the maximum pressure value and impacting the accuracy of the subsequent pressure curve. Furthermore, current technology only extracts the maximum pressure value during the pressing process after the needle cap is connected to the motor spindle inside the instrument. The current method for obtaining the maximum pointer pressing pressure only considers the pressing stage and does not consider the maximum pressing pressure value during the earlier engagement stage. This makes it impossible to accurately determine whether the needle pressing process is abnormal or whether it has caused damage to the automotive instrument after the needle pressing. Therefore, these problems urgently need to be solved. Summary of the Invention

[0007] The purpose of this invention is to address the problems of low accuracy in obtaining the maximum pressure value in existing needle pressure testing methods, the inability to accurately determine whether the needle pressure process is abnormal, and the inability to accurately determine whether the needle pressure has caused damage to the automotive instrument panel. This invention provides a needle pressure testing method for automotive instrument panel pointers.

[0008] A method for testing the pressure point of an automotive instrument cluster pointer, comprising the following steps:

[0009] Step 1: During the pressure needle operation of the car instrument panel, pressure values ​​are collected at the first time interval and stored in the first memory; at the same time, pressure values ​​at each sampling moment within the time period corresponding to the first time interval are collected, and the maximum pressure value within the corresponding time period is stored in the second memory.

[0010] There is a one-to-one correspondence between the pressure values ​​in the second memory and the pressure values ​​in the first memory. The i-th pressure value in the second memory corresponds to the pressure value at the i-th sampling time in the first memory; i is a variable.

[0011] Step 2: Plot a first pressure curve that changes over time based on the pressure values ​​at each sampling moment in the first memory; simultaneously, plot a second pressure curve that changes over time based on the pressure values ​​at each sampling moment in the second memory.

[0012] Step 3: Based on the changing trend of the first pressure curve, determine the time corresponding to the trough in the first pressure curve, and take the time corresponding to the trough as the dividing time.

[0013] Step 4: Divide the second pressure curve into two parts using the dividing moment. The time period before the dividing moment is the joining stage of the automotive instrument needle pressing process, and the time period after the dividing moment is the pressing stage of the automotive instrument needle pressing process.

[0014] Step 5: Take the maximum pressure during the engagement stage and determine whether it exceeds the upper limit of the preset pressure range. If the result is yes, the engagement stage is considered abnormal and has caused damage to the motor shaft of the car instrument after the needle. Otherwise, the engagement stage is normal.

[0015] Take the maximum pressure during the pressing stage and determine whether it exceeds the preset pressure range. If the result is yes, the pressing stage is considered abnormal and may damage the car instrument panel after the needle is pressed. Otherwise, the pressing stage is normal.

[0016] Preferably, if the maximum pressure during the pressing stage exceeds the preset pressure limit, the pressing stage is judged to be abnormal, causing damage to the motor shaft of the automotive instrument after the pressing needle.

[0017] Preferably, if the maximum pressure during the pressing stage is less than the preset lower pressure limit, the pressing stage is judged to be abnormal, which may cause needle drop damage to the automotive instrument panel after the needle is pressed.

[0018] Preferably, the preset pressure range is 40N to 90N.

[0019] Preferably, the first time interval is 100ms.

[0020] The beneficial effects of this invention are as follows:

[0021] The automotive instrument panel pointer indentation detection method of this invention can divide the indentation process into stages, namely the joining stage and the pressing stage, and can perform pressure detection at each stage to accurately determine whether the indentation process is abnormal, thereby determining whether it has caused damage to the automotive instrument panel and specifically determining the type of damage.

[0022] The maximum pointer pressing pressure detected by this invention pertains to the joining and pressing stages, identifying the presence and specific type of damage. This improves the accuracy of quality inspection of automotive instruments after the pointer is pressed, providing a more accurate reflection of the actual operation of the pointer after installation. This reduces the likelihood of pointer detachment and shaft breakage during use, thus decreasing the rework rate. Compared to existing detection methods that obtain the maximum pointer pressing pressure at each stage, this invention provides more accurate results. The detection method of this invention can guide the pointer installation process and reduce the rework rate. Attached Figure Description

[0023] Figure 1 This is a graph showing the relationship between the first and second pressure curves when the maximum pressure during the joining stage is greater than the maximum pressure during the pressing stage.

[0024] Figure 2 This is a graph showing the relationship between the first and second pressure curves when the maximum pressure during the joining stage is less than the maximum pressure during the pressing stage.

[0025] In the attached diagram, the dashed curve represents the second pressure curve, and the solid curve represents the first pressure curve. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0028] The method for detecting the pressure point of an automotive instrument panel pointer as described in this embodiment includes the following steps:

[0029] Step 1: During the pressure needle operation of the car instrument panel, pressure values ​​are collected at the first time interval and stored in the first memory; at the same time, pressure values ​​at each sampling moment within the time period corresponding to the first time interval are collected, and the maximum pressure value within the corresponding time period is stored in the second memory.

[0030] There is a one-to-one correspondence between the pressure values ​​in the second memory and the pressure values ​​in the first memory. The i-th pressure value in the second memory corresponds to the pressure value at the i-th sampling time in the first memory; i is a variable.

[0031] Step 2: Plot a first pressure curve that changes over time based on the pressure values ​​at each sampling moment in the first memory; simultaneously, plot a second pressure curve that changes over time based on the pressure values ​​at each sampling moment in the second memory.

[0032] Step 3: Based on the changing trend of the first pressure curve, determine the time corresponding to the trough in the first pressure curve, and take the time corresponding to the trough as the dividing time.

[0033] Step 4: Divide the second pressure curve into two parts using the dividing moment. The time period before the dividing moment is the joining stage of the automotive instrument needle pressing process, and the time period after the dividing moment is the pressing stage of the automotive instrument needle pressing process.

[0034] Step 5: Take the maximum pressure during the engagement stage and determine whether it exceeds the upper limit of the preset pressure range. If the result is yes, the engagement stage is considered abnormal and has caused damage to the motor shaft of the car instrument after the needle. Otherwise, the engagement stage is normal.

[0035] Take the maximum pressure during the pressing stage and determine whether it exceeds the preset pressure range. If the result is yes, the pressing stage is considered abnormal and may damage the car instrument panel after the needle is pressed. Otherwise, the pressing stage is normal.

[0036] Furthermore, if the maximum pressure during the pressing stage exceeds the preset pressure limit, the pressing stage is deemed abnormal, causing damage to the motor shaft of the car instrument panel after the pressing needle.

[0037] Furthermore, if the maximum pressure during the pressing stage is less than the preset lower pressure limit, the pressing stage is considered abnormal, which may cause needle drop damage to the car's instrument panel after the needle is pressed.

[0038] Furthermore, the preset pressure range is 40N to 90N.

[0039] Furthermore, the first time interval is 100ms. As an example, the pressure values ​​stored in the first memory correspond to sampling times such as 0ms, 100ms, 200ms, 300ms, 400ms, etc., while the pressure value stored in the second memory at the first moment is the maximum value of the collected pressure value within the corresponding time period from 0ms to 100ms.

[0040] Figure 1 and Figure 2 The relationship between the first and second pressure curves is given when the maximum pressure during the joining stage is greater than the maximum pressure during the pressing stage, and when the maximum pressure during the joining stage is less than the maximum pressure during the pressing stage. Figure 1 and Figure 2The pressure readings reflect the overall pressure change trend during the process of pressing the needle on the car's instrument panel, which is in the order of rising, falling, rising, and falling.

[0041] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A method for testing the pressure point of an automotive instrument panel pointer, characterized in that, The method includes the following steps: Step 1: During the pressure needle operation of the car instrument panel, pressure values ​​are collected at the first time interval and stored in the first memory; at the same time, pressure values ​​at each sampling moment within the time period corresponding to the first time interval are collected, and the maximum pressure value within the corresponding time period is stored in the second memory. There is a one-to-one correspondence between the pressure values ​​in the second memory and the pressure values ​​in the first memory. The i-th pressure value in the second memory corresponds to the pressure value at the i-th sampling time in the first memory. i is a variable; Step 2: Plot a first pressure curve that changes over time based on the pressure values ​​at each sampling moment in the first memory; simultaneously, plot a second pressure curve that changes over time based on the pressure values ​​at each sampling moment in the second memory. Step 3: Based on the changing trend of the first pressure curve, determine the time corresponding to the trough in the first pressure curve, and take the time corresponding to the trough as the dividing time. Step 4: Divide the second pressure curve into two parts using the dividing moment. The time period before the dividing moment is the joining stage of the automotive instrument needle pressing process, and the time period after the dividing moment is the pressing stage of the automotive instrument needle pressing process. Step 5: Take the maximum pressure during the engagement stage and determine whether it exceeds the upper limit of the preset pressure range. If the result is yes, the engagement stage is considered abnormal and has caused damage to the motor shaft of the car instrument after the needle. Otherwise, the engagement stage is normal. Take the maximum pressure during the pressing stage and determine whether it exceeds the preset pressure range. If the result is yes, the pressing stage is considered abnormal and may damage the car instrument panel after the needle is pressed. Otherwise, the pressing stage is normal.

2. The method for detecting the pointer indentation of an automotive instrument panel according to claim 1, characterized in that, If the maximum pressure during the pressing stage exceeds the preset pressure limit, the pressing stage is judged to be abnormal, causing damage to the motor shaft of the car instrument after the pressing needle.

3. The method for detecting the pointer indentation of an automotive instrument panel according to claim 1, characterized in that, If the maximum pressure during the pressing stage is less than the preset lower pressure limit, the pressing stage is judged to be abnormal, causing needle drop damage to the car instrument panel after pressing.

4. The method for detecting the pointer pressure pin of an automotive instrument panel according to claim 1, characterized in that, The preset pressure range is 40N to 90N.

5. The method for detecting the pointer pressure pin of an automotive instrument panel according to claim 1, characterized in that, The first time interval is 100ms.

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