Method for judging complete vehicle hot idle wobbling

Abstract

The invention discloses a method for judging complete vehicle hot idle wobbling. The method includes steps of (1) measurement point arrangement including placing a vehicle body horizontally and arranging vibration sensors on seat guide rails, suspensions, suspension supports and an engine; (2) testing including starting the engine, enabling the indicator of a water temperature meter to reach a middle line during the testing process, maintaining an idle rotation speed and making sure the hot idle testing time at least longer than 2 min; (3) evaluation analysis including judging the complete vehicle hot idle wobbling to be qualified when the first-order vibration at the seat guide rails is smaller than first phase preset vibration threshold value and second-order vibration is smaller than asecond-order preset vibration threshold value, otherwise, judging the complete vehicle hot idle wobbling to be unqualified. According to the invention, from the engine which is the source, vibration data of different transmission path is collected and abnormal wobbling is analyzed by utilizing frequency spectrum data. At the same time, a corresponding standard is proposed for quantifying the hot idle wobbling level sensed by a human body, so that inaccuracy of simple subjective evaluation for describing the wobbling size is avoided.

Description

technical field [0001] The invention belongs to the field of automobile testing, and in particular relates to a method for judging thermal idling vibration of a complete vehicle. Background technique [0002] At present, there is no uniform evaluation method for vehicle thermal idling vibration in the industry. Most companies use the subjective feelings of evaluators sitting in the cab as the main basis for evaluation. There is no uniform standard for objective test data, and the overall vibration obtained from the test The amplitude cannot reflect the vibration perceived by the human body most directly. [0003] Therefore, it is necessary to develop a method for judging vehicle thermal idling jitter. Contents of the invention [0004] The purpose of the present invention is to provide a method for judging the thermal idling vibration of the whole vehicle, which can start from the source of the engine, collect the vibration data of each transmission path, and use the freq...

AI Technical Summary

Problems solved by technology

[0002] At present, there is no uniform evaluation method for vehicle thermal idling vibration in the industry. Most companies use the subjective feelings of evaluators sitting in the cab as the main basis for evaluation. There is no uniform standard for objective test data, and the overall vibration obtained from the test The amplitude cannot reflect the vibration perceived by the human body most directly

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