Transmission control system with positive lockup clutch disengag

Details Transmission control system with positive lockup clutch disengag Transmission control system with positive lockup clutch disengag

1981-07-10

1984-04-10

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

192 331, 74732, 74865, B60K 4116

Patent

active

044413858

ABSTRACT:
An automatic transmission includes a gear transmission mechanism including first and second friction mechanisms which are alternatively engaged by alternative supply of first and second pressures thereto when the highest speed stage and the next to highest speed stage are alternatively engaged, and a torque converter including a lockup clutch. A transmission control system includes a pressure control system which controls the gear transmission mechanism by selectively supplying those pressures and possibly others thereto, a lockup clutch control valve which according to its switched position controls the engagement of the lockup clutch and which is switched to its engage position by a control pressure, and a lockup clutch interrupt valve, which selectively transmits the first pressure to the lockup clutch control valve as the control pressure, which is supplied with the second pressure which when present switches it positively to its non communicating condition, and which is also supplied with governor pressure which in the absence of the second pressure switches it to the communicating condition when this governor pressure is higher than a certain value, and otherwise leaves it in the non communicating condition.

REFERENCES:
patent: 4095486 (1978-06-01), Ohuuma
patent: 4349088 (1982-09-01), Ito et al.
patent: 4367812 (1983-01-01), Kobayashi et al.

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