Method and apparatus for a transmission control system

Details Method and apparatus for a transmission control system Method and apparatus for a transmission control system

1976-02-27

1977-06-28

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

B60K 4118, G05G 2100

Patent

active

040317820

ABSTRACT:
A control system used to change the gear ratio in a gear set regulated by a change-gear signal from a control unit is disclosed. A transducer provides an output torque signal which is compared to other signals for initiating the gear change.
In another arrangement, an automatic transmission changes a gear ratio when engine torque is transferred from one member to another member of a three member planetary gear set. This transfer is accomplished 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 control valve, to vary the control valve pressure. 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 closed loop circuit includes a pulse width modulation circuit for regulating the control valve operation, and a feed-forward circuit to minimize the delay in the control valve portion of the system.

REFERENCES:
patent: 3726159 (1973-04-01), Mizote
patent: 3881368 (1975-05-01), Furuhashi et al.
patent: 3882740 (1975-05-01), Forster et al.
patent: 3961546 (1976-06-01), Gilmore et al.
patent: 3983766 (1976-10-01), Forster et al.

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