Road surface grade recognition system and method based on suspension dynamic stroke

Abstract

The invention relates to a road surface grade recognition system and method based on the suspension dynamic stroke, and belongs to the technical field of road surface recognition in vehicle engineering. The road surface grade recognition system is composed of a signal acquisition module, a signal pre-processing module, a computational processing module, a characteristic matrix establishment module, a judgment matrix establishment module and a road surface grade recognition module; vehicle speed signals and all suspension dynamic stroke signals obtained through sampling at equal distances are subjected to wavelet denoising and signal intercepting, estimation values of all suspension road surface unevenness coefficients under the given distance are calculated, and thus a characteristic matrix is established; and the road surface grade under the given distance is recognized by comparing the similarity between the characteristic matrix and road surface judgement matrixes of different grades. Calculation of the matrixes and calculation of matrix norms are introduced, and the grade of the ISO road surface within the given distance can be recognized effectively, accurately and easily while a novel technology is provided for road surface grade recognition.

Description

technical field [0001] The invention relates to the technical field of road surface recognition in vehicle engineering, in particular to a road surface level recognition system and method based on suspension dynamic travel. Background technique [0002] Road surface input is the most important incentive for the vehicle system during driving, and it has an important impact on various aspects such as vehicle ride comfort, ride comfort, handling stability, fuel economy, and component fatigue life. Especially in the analysis and research of vehicle ride comfort and ride comfort, the accuracy of road surface recognition has a prominent impact on suspension system control, which in turn seriously affects vehicle ride comfort and ride comfort. Therefore, it is very important to the development of vehicle suspension control technology to accurately identify the road input through a suitable method, and it is of great significance to the improvement of vehicle performance. [0003] ...

AI Technical Summary

Problems solved by technology

On the one hand, through the direct measurement of the road surface elevation and the use of modern data processing methods, the statistical characteristic parameters of the road surface are obtained to identify the road surface grade. Although the principle is simple and the accuracy is high, the device is complicated and requires a long sampling time; On the one hand, the time domain response signal of the system during the vehicle driving process is converted into a frequency domain signal, and the input road spectrum is estimated by means of the system transfer function, and then the power spectral density analysis of the road spectrum is performed to obtain the road surface level. The device is simple, but the accuracy is low and the cost of data calculation is high

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