Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2001.06b
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- Pages.546-551
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- 2001
Optimal Engine Operation by Shift Speed Improvement for a CVT
CVT 변속속도 개선에 의한 엔진최적운전
Abstract
In this paper, an algorithm to improve the optimal engine operation is suggested by increasing the CVT shift speed. By rearranging the CVT shift dynamic equation, it is found that the CVT shift speed depends on the line pressure as well as the primary pressure. Based on the shift dynamics, an algorithm to accomplish a faster shift speed is presented by increasing the line pressure. In order to apply the algorithm, dynamic models of the line pressure control valve and the ratio control valve are obtained by considering the CVT shift dynamics and model based controllers are designed. It is found from the simulation results that fuel economy can be improved by 2% in spite of the increased hydraulic loss due to the increased line pressure.