Adaptive direct pressure shift control for a motor vehicle trans

Details Adaptive direct pressure shift control for a motor vehicle trans Adaptive direct pressure shift control for a motor vehicle trans

1985-11-29

1987-11-17

Lall, Parshotam S.

Boots, shoes, and leggings

74866, 74867, B60K 4108

Patent

active

047077891

ABSTRACT:
An adaptive shift control system for regulating the operation of a fluid operated torque establishing device associated with a specified speed ratio in a motor vehicle automatic transmission. Shifting from a currently engaged speed ratio to the specified speed ratio includes a preparation phase during which fluid is supplied to the torque establishing device for a predetermined time to fill the same in preparation for torque transmission, and a completion phase during which further fluid is supplied to the device to initiate and progressively increase the transmission of torque therethrough. The change in transmission input speed due to the initiation of torque transmission through the torque establishing device is identified and used to detect the occurrence of overfill or underfill conditions. The predetermined time is adjusted based on such detection so as to adaptively compensate for sources of error which degrade the shift quality by causing overfill or underfill conditions.

REFERENCES:
patent: 4367528 (1983-01-01), Kawamoto et al.
patent: 4445401 (1984-05-01), Ishimura
patent: 4473882 (1984-09-01), Suzuki et al.
patent: 4495576 (1985-01-01), Ito
patent: 4524645 (1985-06-01), Tatsumi
patent: 4570511 (1986-02-01), Nishimura et al.

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