Intermediate shift control apparatus for automatic transmission

Details Intermediate shift control apparatus for automatic transmission Intermediate shift control apparatus for automatic transmission

1987-03-24

1989-01-24

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74752C, B60K 4106

Patent

active

047994045

ABSTRACT:
A control apparatus for an automatic transmission connected to a hydraulic control circuit having a first changeover valve for switching a main transmission mechanism having at least two speed ratios between high and low speed ratios in dependence upon at least vehicle velocity, and a second changeover valve for switching an auxiliary transmission mechanism, which is provided in addition to the main transmission mechanism and has at least two speed ratios, between high and low speed ratios at a vehicle velocity higher than a changeover velocity of the first changeover valve. The control apparatus has a third changeover valve for switching the auxiliary transmission mechanism from low to high at a vehicle velocity lower than the changeover velocity of the first changeover valve, and from high to low when the vehicle velocity rises above the changeover velocity of the first changeover valve. The third changeover valve is capable of forming an intermediate speed, such as a 1.5 or 2.5. speed, by changing over the auxiliary transmission mechanism from low to high while the main transmission mechanism is low.

REFERENCES:
patent: 3367213 (1968-02-01), Abbott
patent: 3633890 (1972-07-01), Crooks
patent: 4222289 (1980-09-01), Watanabe et al.
patent: 4312248 (1982-01-01), Sugimoto et al.
patent: 4679450 (1987-07-01), Hayakawa et al.
patent: 4688449 (1987-08-01), Harada et al.
patent: 4690017 (1987-09-01), Taniguchi et al.

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