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Automobile self-inspection method and detection system

A self-inspection and automobile technology, which is applied in the direction of vehicle testing, measuring devices, machine/structural component testing, etc., can solve the problems of unreachable popularization and self-inspection, achieve convenient, fast and accurate detection methods, improve accuracy, and improve Detection effect

Active Publication Date: 2018-08-10
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing automobile detection methods are too professional to achieve popularization and self-inspection, to provide a self-inspection method based on the abnormal sound of automobiles, to find a simple and convenient method, so that the majority of drivers can quickly grasp The detection method of judging and troubleshooting provides a reliable and practical inspection method for automobile maintenance personnel, and also provides a fast detection method and idea for automatic detection of automobiles

Method used

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  • Automobile self-inspection method and detection system
  • Automobile self-inspection method and detection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take the self-detection of abnormal noise in a car engine during driving as an example.

[0030] step 1,

[0031] First, start the common engine fault signals, standard and normal cars and car engines to be inspected. The running sound of the engine can be input in real time by audio signals such as MEMS sound sensors to convert the audio signals into electrical signals. The signal acquisition unit 3 will The electrical signal is sent for sampling processing (if the accuracy is to be changed, the sampling frequency and quantization number of the selected signal acquisition unit can be changed according to actual needs), the analog signal is converted into a digital signal, and the above data is stored in the data storage unit 4.

[0032] Step 2.

[0033] Tools such as computers or FPGAs or single-chip microcomputers or virtual instruments can perform spectrum analysis and comparison of spectrum characteristics and time-domain characteristics. Therefore, the signal operation con...

Embodiment 2

[0039] Take the common abnormal noise detection of drive shaft and drive axle as an example.

[0040] step 1,

[0041] First, the common transmission shaft fault signal is input by sound sensors such as MEMS and converted into electrical signals. At the same time, the standard normal car and the car to be inspected are started. When the car is slowing down or increasing the speed and turning, the transmission shaft The running sound emitted by related components can be input by the MEMS sound sensor in real time to convert the audio signal into an electric signal, and the signal acquisition unit 3 sends the above electric signal for sampling processing (if the accuracy is to be changed, the accuracy can be changed according to the actual It is necessary to change the sampling frequency and the number of quantization bits of the selected signal acquisition unit), convert the analog signal to a digital signal, and store it in the data storage unit 4.

[0042] Step 2.

[0043] The signa...

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Abstract

The invention discloses a self-testing method and system for automobile, both used for testing technical conditions of automobile or investigating fault positions and reasons. The system uses a signal operation control unit to conduct operation on time-domain characteristics of normal sound signals to obtain frequency spectrum characteristics, wherein the normal sound signals are generated by automobile parts that can produce sound. Through comparison of the time-domain characteristics and spectrum characteristics of a to-be-tested part that can produce sound with those of a normal part that can produce sound, the system obtains a test result of the automobile part that can produce sound. The processing result is transmitted to a result display unit. A user can find a position with a fault or hidden trouble and reasons quickly and accurately according to the test result, so that the relevant part can be taken care of in time, and the reliability of safe automobile driving can be enhanced. The method and the system test in real time, are convenient to use, and are direct and accurate. The method and the system can be used for self-testing of safety and faults of different types of automobiles. The method is reliable for self-testing of the work state of an automobile without tearing the automobile apart.

Description

Technical field [0001] The invention belongs to the technical field of automobile detection, and specifically relates to a detection, analysis and judgment detection method for determining the technical condition of the automobile or finding out the fault location and the cause under the condition of the automobile being not disassembled. Background technique [0002] Automobile inspection is an inspection to determine the technical condition or working ability of the automobile. During the use of the car, with the extension of the use time (or the increase of the mileage), its parts gradually wear, corrode, deform, age, and deteriorate the lubricating oil, which causes the clearance of the matching pair to become larger, causing loose movement and vibration , Noise, air leaks, water leaks, oil leaks, etc., resulting in a decline in vehicle technical performance. Usually in the process of car inspection, it is mainly through experienced maintenance personnel to find out the car ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/007
CPCG01M17/007
Inventor 刘慧敏姜训勇
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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