Intelligent diagnosis method and diagnosis system for in-vehicle jitter problem under vehicle start-stop working condition

Abstract

The invention discloses an intelligent diagnosis method and diagnosis system for an in-vehicle jitter problem under a vehicle start-stop working condition. The method comprises the following steps: 1) carrying out band-pass filtering on acceleration time domain data of a steering wheel and a seat in a vehicle start-stop process, and then carrying out effective data segment interception; 2) calculating an acceleration four-power vibration dose value of the effective data segment, and judging the in-vehicle jitter degree; 3) when the in-vehicle jitter is abnormal, performing spectral analysis on the abnormal acceleration time domain data segment to find out the main problem frequency of the in-vehicle jitter; and 4) obtaining the reason and solution suggestion of the in-vehicle jitter by using an in-vehicle jitter problem matching model. According to the method, the in-vehicle jitter degree is judged by utilizing the vibration dose of the acceleration of 4 times, the judgment result is accurate and rapid, meanwhile, the in-vehicle jitter abnormal reason and solution suggestion can be obtained, and the in-vehicle jitter diagnosis problem under the vehicle start-stop working condition is well solved.

Description

technical field [0001] The invention belongs to the technical field of automobile testing, and in particular relates to an intelligent diagnosis method and a diagnosis system for the vibration problem in the vehicle under the start-stop working condition of the automobile. Background technique [0002] Ordinary hybrid electric vehicles are relatively low in cost and become the most practical solution for the promotion of energy-saving vehicles. However, compared with conventional vehicles, the number of engine start and stop times of hybrid electric vehicles is more frequent and the torque output by the starter is larger at the same time. The frequent start and stop of the engine will cause obvious vibration in the car, thereby reducing the comfort of the passengers in the car. Therefore, the problem of vibration in the car caused by the engine start and stop conditions needs to be optimized and improved in the early stage of research and development. [0003] Although at p...

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Problems solved by technology

[0005] In view of this, the present invention aims to propose an intelligent diagnosis method and diagnosis system for the vibration problem in the vehicle under the starting and stopping conditions of the automobile, so as to solve the problems in the prior art Mature solutions and intelligent diagnostic tools cannot efficiently and quickly solve the problem of vibration in the car caused by engine start-stop conditions

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