Electronic transmission gear change control system

Details Electronic transmission gear change control system Electronic transmission gear change control system

1975-10-10

1978-02-14

Coan, James F.

Machine element or mechanism

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

Preselected indexed position

74869, B60K 4118

Patent

active

040732037

ABSTRACT:
To provide for precise shifting of gears in automatic transmissions in dependence on vehicle speed and loading on the engine, a speed signal and a throttle position signal are applied to separate control stages one to control up-shifting and the other to control down-shifting; further, a separate kick-down switch is provided for rapid down-shifting. The control stages are so arranged that up-shifting is commanded in accordance with vehicle operating characteristics, but down-shifting is commanded only with a lag, or hysteresis, with respect to the vehicle speed, to prevent excessive shifting of the transmission. The shift control circuits may be either separate trigger circuits controlling up-shifting and down-shifting of the respective gear ranges, or may be separate networks processing the respective input signals (speed, engine loading) and providing output control signals to a shift control trigger circuit.

REFERENCES:
patent: 3750495 (1973-08-01), Ito et al.
patent: 3776048 (1973-12-01), Enomoto et al.
patent: 3813964 (1974-06-01), Ichimura et al.
patent: 3885472 (1975-05-01), Wakamatsu et al.
patent: 3938409 (1976-02-01), Uozumi
patent: 3939738 (1976-02-01), Adey et al.

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