Method and apparatus for transmission control system

Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position

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B60K 4118

Patent

active

041310365

ABSTRACT:
A control system to change gear ratio in an automatic transmission through friction elements engaged by hydraulic pressure. A closed loop electrical circuit is completed between a transducer, which provides an electrical signal related to the output torque of the transmission, and a pair of control valves, to vary the pressure applied to a friction element by each control valve. A circuit for computing reaction torque is coupled between the transducer and a logic control circuit, which provides logic command signals for controlling operation of components in the closed loop circuit. The system computes an output torque ramp when a downshift is called for by the shift point computer and uses controllers which react oppositely to control engagement of a clutch and brake in response to error signals of torque output compared to a desired ramp to produce a proper shift.

REFERENCES:
patent: 3710647 (1973-01-01), Dach et al.
patent: 3956947 (1976-05-01), Leising et al.
patent: 3961546 (1976-06-01), Gilmore et al.
patent: 4031782 (1977-06-01), Miller et al.

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