Control system for automatic power transmission with variable sh

Details Control system for automatic power transmission with variable sh Control system for automatic power transmission with variable sh

1990-09-04

1992-01-14

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, 74865, 74861, B60K 4106

Patent

active

050799720

ABSTRACT:
A shift control system controls a shifting transition period in order to obtain an optimal shift feeling. The shifting control system sets a shifting transition period which is variable depending upon a vehicular driving condition so that an optimum transmission speed ratio shifting transition in view of a required magnitude of energy absorption can be achieved without causing a substantial shift shock. Preferably, the vehicular driving condition includes vehicle speed which controls which transmission speed ratio is selected for comparison with the current transmission speed ratio to derive a target transition period. The shifting transition period is then adjusted toward the target transition period for smooth shifting.

REFERENCES:
patent: 4488456 (1984-12-01), Taga et al.
patent: 4502354 (1985-03-01), Suzuki et al.
patent: 4506563 (1985-03-01), Hiramatsu
patent: 4513639 (1985-04-01), Hiramatsu
patent: 4519273 (1985-05-01), Shimizu et al.
patent: 4563918 (1986-01-01), Sugano
patent: 4791568 (1988-12-01), Hiramatsu et al.
patent: 4813307 (1989-03-01), Hiramatsu et al.
patent: 4967620 (1990-11-01), Shimanaka

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