Downshift control circuit for hydraulic transmission

Details Downshift control circuit for hydraulic transmission Downshift control circuit for hydraulic transmission

1975-04-04

1976-08-17

Wyche, Benjamin W.

Machine element or mechanism

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

Preselected indexed position

192 4A, B60K 4104

Patent

active

039747204

ABSTRACT:
A downshift control circuit including a self-holding element is coupled through an electrohydraulic transducer to the hydraulic power transmission of a road vehicle to supply thereto a downshift signal in the form of fluid. The self-holding element is operated upon depression of the brake pedal and released upon depression of the accelerator pedal. The electro-hydraulic transducer is operated by the self-holding element to apply said downshift signal once the brake pedal is depressed so that shifting point is moved to a higher speed to effect a downshift to the next lower speed. With the transmission gear at low, the braking effort of the engine is utilized to the fullest extent as an aid to the normal braking.

REFERENCES:
patent: 2878885 (1959-03-01), Hamm
patent: 2907423 (1959-10-01), Jaeschke
patent: 3374693 (1968-03-01), Castelet
patent: 3628642 (1971-12-01), Ravenel
patent: 3733930 (1973-05-01), Mizote
patent: 3776048 (1973-12-01), Enomoto et al.

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