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Automobile steering column assembly quality detection method

A quality inspection method and steering column technology, which is applied in the direction of vehicle steering/bump performance, measuring devices, and testing of mechanical components, can solve problems such as ignoring the complexity of assembly systems, reduce quality problems, and improve production efficiency.

Inactive Publication Date: 2020-07-28
BOSCH HUAYU STEERING SYST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that this method judges the assembly quality by simply setting the threshold, which is prone to misjudgment and missed judgment, ignoring the complexity of the assembly system

Method used

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  • Automobile steering column assembly quality detection method
  • Automobile steering column assembly quality detection method
  • Automobile steering column assembly quality detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Use the acceleration sensor to collect the vibration signals generated during the simulation work of 250 normally assembled steering columns and 250 abnormally assembled steering columns , forming the original signal sample set Q , n=1~500 represents the total sample size collected.

[0039] Such as figure 2 As shown, it is a set of vibration signal samples , a total of 132241 samples were taken, the sampling interval was T=0.00004s, and the sampling frequency was , the sampling time is t= .

[0040] Step 2: Convert the vibration signal sample set to Converted into a frequency domain signal set P, the specific conversion is as follows: , P= , For one set of vibration signal samples Frequency domain signal after fast Fourier transform.

[0041]Step 3: Observe the spectrogram and analyze according to actual experience. The low frequency part of the frequency domain signal implies a large number of assembly quality characteristics of the EPSc s...

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PUM

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Abstract

The invention relates to the technical field of automobile steering columns, in particular to an automobile steering column assembly quality detection method. The method comprises the following stepsof: performing fast Fourier transform on time domain signals to analyze frequency domain signals by acquiring vibration signals generated during the simulated operation (steering) of a steering column; removing a high-frequency part, and reserving a low-frequency part which implies a large amount of assembly quality information; calculating the vibration acceleration level of a low-frequency part;carrying out smoothing processing by using a least square filter; downsampling to carry out dimension reduction on sample data; performing standardization processing by using a zscore algorithm; andtraining an SVM classification model to realize assembly quality detection. According to the method of the invention, the defect that the detection of the assembly quality of each process is focused in the prior art is overcome; from the aspect of the integrity of a system, the assembly quality is comprehensively diagnosed by analyzing the vibration signals generated during the simulated operationof the steering column, so that abnormal assembly products can be effectively identified, production efficiency is improved, and the overall assembly quality detection of the automobile steering column is objectively realized.

Description

technical field [0001] The invention relates to the technical field of an automobile steering column, in particular to a method for detecting assembly quality of an automobile steering column. Background technique [0002] With the continuous development of the automobile industry, automobiles have entered thousands of households as an important means of transportation, and the safety of automobiles has attracted more and more attention. People have also put forward higher requirements for the safety of automobiles. As an important part of the current mainstream steering system, the EPSc automotive steering column is an important part to ensure the safety of the car. Its quality issues are related to the reliability, durability, service life, and even personal safety of the car. [0003] The assembly process is the last step in the manufacture of EPSc automobile steering column, and the assembly quality directly affects the final product quality. The assembly process is a p...

Claims

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Application Information

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IPC IPC(8): G01M13/00G01M17/06G06K9/00G06K9/62
CPCG01M13/00G01M17/06G06F2218/04G06F2218/12G06F18/2411G06F18/214
Inventor 李俏程红梁秦健
Owner BOSCH HUAYU STEERING SYST CO LTD