Method for detecting installation position of motor crank of front windscreen wiper of automobile

Abstract

The invention discloses a method for detecting the installation position of a motor crank of an automobile front windscreen wiper. The method comprises the steps of parameter definition in measurement, parameter tolerance range measurement and measurement implementation. When the wiper assembly is comprehensively detected, new assembly parameters, namely the upturning position and the downturning position of the wiper blade, are introduced and detected, and whether the mounting position of the motor crank of the front wiper of the automobile is correct or not is judged by detecting the two newly introduced parameter values. According to the invention, the detection process is directly integrated into the existing process for parallel detection, and the production process and the production period of the assembly are not increased.

Description

Technical Field

[0001] The invention relates to the technical field of crank installation position detection, in particular to a method for detecting the installation position of a crank of a front wiper motor of an automobile. Background Art

[0002] The crank of the front wiper motor is an important part of the four-bar linkage of the wiper motor and the wiper assembly. The crank installation position must form a specific angle with the motor parking position; this angle directly determines the brushing range of the wiper blade. Therefore, whether the crank installation position is correct will directly affect the quality of the wiper assembly.

[0003] When installing the crank, if the motor is not in the parking position due to some unexpected reasons (it is not possible to observe whether the motor is in the parking position through the output shaft and appearance of the wiper motor), the quality problem of the crank installation position being wrong will occur. This quality problem cannot be found by naked eye observation, nor can it be detected by the existing test parameters during the comprehensive test of the wiper assembly. Therefore, assembly products with such quality problems will easily flow out to the main car factory and may not be discovered until they are installed on the car. Summary of the invention

[0004] The object of the present invention is to provide a method for detecting the installation position of a crank of a front wiper motor of an automobile, so as to solve the problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for detecting the installation position of a crank of a front wiper motor of an automobile, comprising the following steps: Step 1. Definition of parameters in measurement: Set the wiper blade position when the wiper assembly is parked to 0°; the angle formed by the highest point of the wiper blade's motion trajectory on the windshield and the parking position is called the wiper blade upward angle, marked as A; the angle formed by the lowest point of the wiper blade's motion trajectory on the windshield and the parking position is called the wiper blade downward angle, marked as B; Step 2: Parameter tolerance range measurement: First, make two assembly products with the cranks installed in the extreme tolerance position, and then measure the values ​​of the scraper blade upward turning angle A and the scraper blade downward turning angle B of the two assembly products; these values ​​are the tolerance ranges of the scraper blade upward turning angle A and the scraper blade downward turning angle B of this model of assembly products; Step 3, measurement implementation: In order to accurately and reliably detect the scraper blade upward turning angle A and the scraper blade downward turning angle B and determine whether the crank installation position is correct, two methods are obtained based on practical experience and theoretical analysis and combined with existing production processes, namely method one and method two.

[0006] Preferably, in step three, method one comprises the following steps: Step 11: Start the wiper assembly product at a low speed and park it normally to eliminate the possibility that the wiper assembly product is not in the parking position at the beginning; Step 12: After parking is completed, clear the recorded data of the encoder or angle sensor for measuring the scraping angle of the wiper assembly; Step 13: After the recorded data is cleared, the wiper assembly product is started again, and an encoder or an angle sensor is used to measure the upward flip angle A of the wiper blade when the wiper blade is in the upward flip position and the downward flip angle B of the wiper blade when the wiper blade is in the downward flip position.

[0007] Preferably, step 13 also includes allowing the motor to work for more than one cycle in both high-speed and low-speed states, so that there are at least two groups of values ​​of the scraper blade upward flip angle A and the scraper blade downward flip angle B measured, and the arithmetic average of multiple groups of data is directly performed to obtain the average value.

[0008] Preferably, in step three, method two comprises the following steps: Step 21, directly clearing the recorded data of the encoder or angle sensor for detecting the scraping angle of the wiper assembly; Step 22: After the recorded data is cleared, the wiper assembly product is started, and an encoder or an angle sensor is used to measure the upward flipping angle A of the wiper blade at the upward flipping position, the downward flipping angle B of the wiper blade, and the angle of the assembly product when it stops; Step 23, the angle of the assembly product when it is parked is recorded as C. If C is equal to zero or very close to zero, it means that the assembly is in the parking position before the detection and the measurement parameters are available. Otherwise, it means that the assembly is not in the parking position before the detection, and the measured scraper blade upward tilt angle A and scraper blade downward tilt angle B cannot be used and need to be remeasured.

[0009] Preferably, step 23 also includes allowing the motor to work for more than one cycle in both high-speed and low-speed states, so that there are at least two groups of values ​​of the scraper blade upward flip angle A and the scraper blade downward flip angle B measured here, and the arithmetic average of multiple groups of data is directly performed to obtain the average value.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The present invention introduces and detects new assembly parameters, namely, the upward and downward positions of the wiper blades, during comprehensive inspection of the wiper assembly, and determines whether the installation position of the crank of the front wiper motor of the automobile is correct by detecting the values ​​of the two newly introduced parameters. The present invention directly integrates the inspection process into the existing process for parallel inspection, and does not increase the production process and production cycle of the assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A logical process diagram for detection of method 1 of the present invention; Figure 2 This is a logical process diagram for detection of method 2 of the present invention. DETAILED DESCRIPTION

[0012] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] Please refer to the attached Figure 1-2 Through existing fault parts and theoretical analysis, it is found that the crank installation position directly determines the wiper blade's brushing range; that is, the highest point (called the wiper blade upturn position) and the lowest point (called the wiper blade downturn position) of the wiper blade's movement trajectory on the windshield. If the tolerance range of these two angles is measured, and these two parameters are measured during the comprehensive inspection of the wiper assembly, then it is possible to detect whether the crank installation position is correct during the comprehensive inspection of the wiper assembly.

[0014] The present invention provides: a method for detecting the installation position of a crank of a front wiper motor of an automobile, comprising the following steps: Step 1. Definition of parameters in measurement: Set the wiper blade position when the wiper assembly is parked to 0°; the angle formed by the highest point of the wiper blade's motion trajectory on the windshield and the parking position is called the wiper blade upward turning angle, marked as A; the angle formed by the lowest point of the wiper blade's motion trajectory on the windshield and the parking position is called the wiper blade downward turning angle, marked as B; thus, two measurable parameters, the wiper blade upward turning angle A and the wiper blade downward turning angle B, are introduced; Step 2: Parameter tolerance range measurement: First, make two assembly products with the cranks installed in the extreme tolerance position, and then measure the values ​​of the scraper blade upward turning angle A and the scraper blade downward turning angle B of the two assembly products; these values ​​are the tolerance ranges of the scraper blade upward turning angle A and the scraper blade downward turning angle B of this model of assembly products; Step 3, measurement implementation: In order to accurately and reliably detect the scraper blade upward turning angle A and the scraper blade downward turning angle B and determine whether the crank installation position is correct, two methods are obtained based on practical experience and theoretical analysis and combined with existing production processes, namely method one and method two.

[0015] Method 1 includes the following steps: Step 11: Start the wiper assembly product at a low speed and park it normally to eliminate the possibility that the wiper assembly product is not in the parking position at the beginning; Step 12: After parking is completed, clear the recorded data of the encoder or angle sensor for measuring the scraping angle of the wiper assembly; Step 13: After the recorded data is cleared, the wiper assembly product is started again, and the encoder or angle sensor is used to measure the upward flip angle A of the wiper blade when the wiper blade is in the upward flip position and the downward flip angle B of the wiper blade when the wiper blade is in the downward flip position. The motor is also operated for more than one cycle at high speed and low speed, so that there are at least two groups of values ​​of the upward flip angle A and the downward flip angle B of the wiper blade measured, and the average value is directly obtained by arithmetic averaging of the multiple groups of data.

[0016] Method 2 includes the following steps: Step 21, directly clearing the recorded data of the encoder or angle sensor for detecting the scraping angle of the wiper assembly; Step 22: After the recorded data is cleared, the wiper assembly product is started, and an encoder or an angle sensor is used to measure the upward flipping angle A of the wiper blade at the upward flipping position, the downward flipping angle B of the wiper blade, and the angle of the assembly product when it stops; Step 23, the angle of the assembly product when it is parked is recorded as C. If C is equal to zero or very close to zero, it means that the assembly is in the parking position before the test, and the measurement parameters are available; otherwise, it means that the assembly is not in the parking position before the test, and the measured scraper blade flip angle A and scraper blade flip angle B cannot be used and need to be re-measured. It also includes letting the motor work for more than one cycle at high speed and low speed. Therefore, the values ​​of the scraper blade flip angle A and scraper blade flip angle B measured here have at least two groups, and the average value is directly obtained by arithmetic averaging of multiple groups of data.

[0017] In most cases, the assembly stops in the parking position; therefore, method 2 is more efficient than method 1.

[0018] The present invention introduces and detects new assembly parameters, namely, the upward and downward positions of the wiper blades, during comprehensive inspection of the wiper assembly, and determines whether the installation position of the crank of the front wiper motor of the automobile is correct by detecting the values ​​of the two newly introduced parameters. The present invention directly integrates the inspection process into the existing process for parallel inspection, and does not increase the production process and production cycle of the assembly.

[0019] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting the installation position of a crank of a front wiper motor of an automobile, characterized in that: The following steps are involved: Step 1. Definition of parameters in measurement: Set the wiper blade position when the wiper assembly is parked to 0°; the angle formed by the highest point of the wiper blade's motion trajectory on the windshield and the parking position is called the wiper blade upward angle, marked as A; the angle formed by the lowest point of the wiper blade's motion trajectory on the windshield and the parking position is called the wiper blade downward angle, marked as B; Step 2: Parameter tolerance range measurement: First, make two assembly products with the cranks installed in the extreme tolerance position, and then measure the values ​​of the scraper blade upward turning angle A and the scraper blade downward turning angle B of the two assembly products; these values ​​are the tolerance ranges of the scraper blade upward turning angle A and the scraper blade downward turning angle B of this model of assembly products; Step 3, measurement implementation: In order to accurately and reliably detect the scraper blade upward turning angle A and the scraper blade downward turning angle B and determine whether the crank installation position is correct, two methods are obtained based on practical experience and theoretical analysis and combined with existing production processes, namely method one and method two.

2. A method for detecting the installation position of a crank of a front wiper motor of an automobile according to claim 1, characterized in that: In step three, method one includes the following steps: Step 11: Start the wiper assembly product at a low speed and park it normally to eliminate the possibility that the wiper assembly product is not in the parking position at the beginning; Step 12: After parking is completed, clear the recorded data of the encoder or angle sensor for measuring the scraping angle of the wiper assembly; Step 13: After the recorded data is cleared, the wiper assembly product is started again, and an encoder or an angle sensor is used to measure the upward flip angle A of the wiper blade when the wiper blade is in the upward flip position and the downward flip angle B of the wiper blade when the wiper blade is in the downward flip position.

3. A method for detecting the installation position of a crank of a front wiper motor of an automobile according to claim 2, characterized in that: The step 13 also includes allowing the motor to work for more than one cycle in both high speed and low speed states, so that there are at least two groups of values ​​of the scraper blade upward flip angle A and the scraper blade downward flip angle B measured, and the arithmetic average of the multiple groups of data is directly performed to obtain the average value.

4. A method for detecting the installation position of a front wiper motor crank of an automobile according to claim 1, characterized in that: In step three, method two includes the following steps: Step 21, directly clearing the recorded data of the encoder or angle sensor for detecting the scraping angle of the wiper assembly; Step 22: After the recorded data is cleared, the wiper assembly product is started, and an encoder or an angle sensor is used to measure the upward flipping angle A of the wiper blade at the upward flipping position, the downward flipping angle B of the wiper blade, and the angle of the assembly product when it stops; Step 23, the angle of the assembly product when it is parked is recorded as C. If C is equal to zero or very close to zero, it means that the assembly is in the parking position before the detection and the measurement parameters are available. Otherwise, it means that the assembly is not in the parking position before the detection, and the measured scraper blade upward tilt angle A and scraper blade downward tilt angle B cannot be used and need to be remeasured.

5. A method for detecting the installation position of a front wiper motor crank of an automobile according to claim 4, characterized in that: The step 23 also includes allowing the motor to work for more than one cycle in both high speed and low speed states. Therefore, there are at least two groups of values ​​of the scraper blade upward flip angle A and the scraper blade downward flip angle B measured here, and the average value is directly obtained by performing arithmetic averaging on the multiple groups of data.

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