Nippondenso Co., Ltd.

Ichiro Yamauchi

Yoshifumi Kato

Masami Fujitsuna

Tsutomu Tashiro

An automatic transmission is controlled by the use of estimation of a disturbance so that an input shaft rotates as desired to suppress shock caused during a speed-change transient mode. The disturbance is estimated from an actual rotational speed of an input shaft of the automatic transmission and a control command value to a pressure regulating device based on a predetermined transfer function model. The disturbance may be estimated alternatively by the use of a speed change in the rotational speed of the input shaft.

Method and apparatus for controlling speed-change transient mode of

A slip control apparatus provides a smooth response of actual slippage amount during a transitional period when a lock-up clutch is shifting from a disengaged state to a slipping state, and quickly determines a response to external disturbances when the slipping of the clutch is in a steady state. The apparatus has a first control unit for outputting a first control value based on the difference between target slippage amount and actual slippage amount, a second control unit for outputting a second control value based on the actual slippage amount, and a clutch pressure regulating unit for controlling an electromagnetic valve to control a lockup system on the basis of the sum of the first and second control values. The first control unit performs control for the transitional state of the lock-up clutch between the disengaged state and the slipping state. The second control unit performs control in response to external disturbances when the slipping of the clutch has reached the steady state via the transitional state.

Growing community of inventors

Kariya, Japan

Ichiro Yamauchi