某轿车动力装置参数的匹配设计英文翻译论文.doc

某轿车动力装置参数的匹配设计英文翻译毕业论文 Abstract The availability of pressure information of a hydraulic actuator makes it possible to improve the quality of vehicle power transmission via precise feedback control and to realize on-board fault diagnosis. However, the high cost of a pressure sensor has not allowed its widespread deployment despite such apparent advantages. This paper presents an observer-based algorithm to estimate the pressure output of a hydraulic actuator in a vehicle power transmission control system. The proposed algorithm builds on more readily available slip velocity and the models of a hydraulic actuator and a mechanical subsystem. The former is obtained empirically via system identification due to the complexity of the hydraulic actuator, while the latter is derived physically. The resulting robust observer is guaranteed to be stable against possible parametric variations and torque estimation errors. The hardware in-the-loop studies demonstrate the viability of the proposed algorithm in the field of advanced vehicle power transmission control and fault diagnosis. C 2002 Elsevier Science Ltd. All rights reserved. Received 1 March2001; accepted 27 August 2001 Keywords: Robust observer; System identification; Hydraulic actuator; Vehicle power transmission control system; Hardware-in-the-loop simulation 1.Introduction Automatic and continuously variable transmission systems have been expanding their presence in passenger vehicles in recent years,which has naturally prompted active research on vehicle power transmission control systems. The main topics include shift control algorithm (Shin, Hahn, Yi, Lee, 2000a; Zheng, Srinivasan, Rizzoni, 1999; Shin, Hahn, Lee, 2000b), feedback control of torque converter clutch slip systems (Jauch, 1999; Hibino, Osawa, Yamada, Kono, Tanaka, 1996; Hahn Lee, 2000), new hydraulic circuits for control performance enhancement (Jung, Cho, Lee, 2000), etc. Despite the extensive research effort on control algorithms, it appe