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Automobile damping spring fault diagnosis instrument

A fault diagnosis instrument and automobile shock absorption technology, which is applied in the direction of instruments, vehicle testing, and measuring devices, can solve the problem of lack of effective means for fault diagnosis of shock absorbing springs, etc.

Inactive Publication Date: 2010-06-16
王亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of effective means for fault diagnosis of automobile shock absorbing springs in China, so this instrument has a good application prospect

Method used

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  • Automobile damping spring fault diagnosis instrument
  • Automobile damping spring fault diagnosis instrument
  • Automobile damping spring fault diagnosis instrument

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] 1. Hardware circuit design

[0010] (1) Signal conditioning circuit

[0011] The integrated switched capacitor filter MAX280 is used to form an anti-aliasing filter circuit. The MAX280 is a fifth-order low-pass filter with an adjustable cutoff frequency. When its clock pin is connected to the internal clock, the maximum cut-off frequency is 1.4kHz; and when the automobile shock spring works stably, the signal frequency does not exceed 500Hz, so the cut-off frequency of the filter is set to 700Hz.

[0012] (2), DSP circuit

[0013] The DSP circuit completes data acquisition and digital filtering, and uses the built-in algorithm to complete tasks such as fault diagnosis. The DSP in the present invention adopts TMS320VC5409 produced by Texas Instruments (TI), which is a high-speed, cost-effective and low-power 16-bit fixed-point general-purpose DSP chip of the TMS320C54xx series; In TMS320VC5409, the user program is stored in the external data space (8000H~FFFFH), so a...

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PUM

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Abstract

The invention relates to an automobile secondary instrument, in particular relating to an automobile damping spring fault diagnosis instrument. The invention provides an automobile damping spring fault diagnosis instrument with stable work and effective diagnosis result. The automobile damping spring fault diagnosis instrument is composed of a conditioning circuit, a DSP circuit, an A / D conversion circuit, a singlechip circuit and a communication circuit, and has the following main working flows: the input and output signal of a spring is conditioned by a filter circuit, then is converted into a digital signal by the A / D converter, and then enters into a DSP for operation; and the obtained diagnosis result is sent into a singlechip by the communication interface circuit, is displayed on an LED by the singlechip and sent to a PC machine through a serial port. The singlechip controls the work state of the DSP via the communication interface.

Description

Technical field: [0001] The invention relates to an auxiliary instrument of an automobile, in particular to a fault diagnosing instrument of an automobile shock-absorbing spring. Background technique: [0002] According to the input and output data of the shock absorber spring obtained by sampling, the vibration equation of the spring is obtained by using an effective nonlinear system identification method, and then the nonlinear transmission of the shock absorber spring is obtained by multi-dimensional Fourier transform. Frequency domain representation of the function - Generalized Frequency Response Function GFRF. GFRF is a non-parametric model describing the nonlinear transfer characteristics of the system □ It can uniquely describe the frequency domain characteristics of the system transfer characteristics □ Therefore, the nonlinear changes of the transfer characteristics before and after the system failure can be accurately reflected by GFRF. When the spring is in norm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01M17/007
Inventor 王亮
Owner 王亮
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