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International Journal of Automotive Technology > Volume 18(1); 2017 > Article
International Journal of Automotive Technology 2017;18(1): 179-194.
doi: https://doi.org/10.1007/s12239-017-0018-4
G. SHI1,2, P. DONG1,2,*, H. Q. SUN1,2, Y. LIU3, Y. J. CHENG1,2, X. Y. XU1,2
1Department of Automotive Engineering, School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
2Beijing Key Laboratory for High Efficient Transmission and System Control of New Energy Resource Vehicle, Beihang University, Beijing 100191, China
3Beijing Institute of Space Launch Technology, Beijing 100076, China
PDF Links Corresponding Author.  P. DONG , Email. dongpengbeihang@163.com
Received: July 29, 1988; Revised: April 30, 2016   Accepted: June 28, 2016.
This paper focuses on the way of keeping shift quality of automatic transmissions consistent in mass production and with mileage accumulation. We investigate the main factors influencing the consistency of shift quality. Test results show that the torque to pressure (T2P) and pressure to current (P2I) characteristics of shifting elements are easily affected. A simulation model of an 8-speed automatic transmission is established to simulate the dynamic process of clutch-to-clutch shift. Simulation results demonstrate that the change of T2P and P2I characteristics has a significant influence on shift quality. In order to compensate for the influences, we develop two adaptive control strategies, i.e., the adaptive control strategies for torque phase and inertia phase. They make use of the measured speed information and time information to evaluate shift quality. Then the control parameters are tuned to adapt to the change of T2P and P2I characteristics. Vehicle tests verify that the developed adaptive control strategies are effective to keep shift quality consistent in mass production and with mileage accumulation.
Key Words: Automatic transmission, Adaptive control strategy, Shift quality, Torque to pressure characteristic, Pressure to current characteristic
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