Rough Road Identification Method Based on Engine Speed Variation Rate

Abstract:

On rough road busy-shifting often occurs when shifting law is built based on traditional two parameters (i.e., velocity and throttle). In order to resolve this problem, this paper provides a method of recognizing rough road and modifying shift point. At first, a dynamic model was set up to demonstrate the possibility of identifying rough road by longitudinal acceleration. Furthermore, advantages of the engine speed variation rate were analyzed, so engine speed variation rate distinguishing the rough road was proved better. Then the analysis of time-domain and frequency-domain of the engine speed variation rate was carried out .On the basis of the result, the method of frequency domain based on the FFT and “Cross Meter Method” based on the times of the instantaneous values of engine speed variation rate greater than the threshold value was proposed. At last, the method of modifying shift strategy was proposed on the rough road. Through the road test, it was effective to prevent busy-shifting on rough road.

• Periodical: Applied Mechanics and Materials (Volumes 300-301)
• Pages: 959-966
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.300-301.959
• Online since: February 2013
• Authors: Yu Long Lei, Shun Bo Li, Hong Bo Liu
• Keywords: Automatic Transmission, Cross Meter Method, FFT Method, Rough Road Detection, Shift Strategy Modification

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