Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1998-08-02
2000-05-30
Estremsky, Sherry L.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477132, F16H 6104
Patent
active
06068576&
ABSTRACT:
When a vehicle driving state of an automatic transmission is changed to a power-off state from a power-on state during a down shift involving the disengagement of one friction element and the engagement of another friction element, a disengagement side pressure PA is reduced rapidly by a feedback control based on the change in gear ratio because of a reduction of an input torque. The disengagement side pressure control is unable to complete change of the gear ratio to complete the down shift. When the disengagement side pressure is reduced to a value less than a return spring load pressure PG or when the gear ratio change has not achieved a basic value in a predetermined time, the down shift control is changed from primary control by the disengagement side pressure control to primary control by an engagement side control so that the gear ratio change is completed by control of the engagement side pressure.
REFERENCES:
patent: 5046174 (1991-09-01), Lentz et al.
patent: 5445579 (1995-08-01), Fujita et al.
patent: 5800309 (1998-09-01), Takiguichi et al.
patent: 5888170 (1999-03-01), Takiguichi et al.
Kubo Takayuki
Nishida Masaaki
Saito Masao
Suzuki Akitomo
Taniguchi Takao
Aisin Aw Co. Ltd.
Estremsky Sherry L.
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