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Development of Smooth Shift Control System with Output Torque Estimation
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English
Abstract
Most automatic transmissions are controlled in compliance with a predetermined program. Transient control during gear shift is also carried out according to a predetermined process. In this method a lot of labor is required to tune data tables. So we developed a tuning free system by feedback control using torque estimation technology and the experimental result is reported.
Torque fluctuation during shift is detected and fed back to compare the torque reference, which is generated from the estimated torque itself. The engine torque is decreased by means of retarding the ignition spark advance, according to the comparison deviation.
As a consequence of the feedback, the transient torque control is carried out without any tuning trouble, and better than usual torque fluctuation is obtained.
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Authors
Citation
Ibamoto, M., Kuroiwa, H., Minowa, T., Sato, K. et al., "Development of Smooth Shift Control System with Output Torque Estimation," SAE Technical Paper 950900, 1995, https://doi.org/10.4271/950900.Also In
References
- Minowa T. et al. Smooth Gear Shift Control System Using Estimated Torque SAE Technical Paper 941013 1994
- Schwab M. Electronic Control of a 4-Speed Automatic Transmission with Lock-Up Clutch SAE Technical Paper 840448 1984