System for engaging lock-up clutch at highest speed ratios of di

Details System for engaging lock-up clutch at highest speed ratios of di System for engaging lock-up clutch at highest speed ratios of di

1988-10-31

1990-06-05

Herrmann, Allan D.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Impeller-turbine type fluid circuit in series with planetary...

192 33, 192 331, F16H 4700

Patent

active

049303724

ABSTRACT:
A system for controlling a lock-up clutch of a torque converter comprises a lock-up control valve, and a shuttle valve. The lock-up control valve includes a spool having a first and a second pressure acting areas. The shuttle valve delivers an output hydraulic pressure when at least one of two inlet ports is pressurized. One of the inlet ports is subject to a first hydraulic pressure which builds up at a band brake during operation with the fourth speed ratio, while the other inlet port is subject to a second hydraulic pressure which builds up at an overrun clutch during operation with the third, second, and first speed ratios when an engine brake operation range is selected. The output hydraulic pressure of the shuttle valve is transmitted to the lock-up control valve to act on the second pressure acting area. The first pressure acting area is subject to a third hydraulic pressure which builds up at a high clutch during operation with each of the third and fourth speed ratios. The lock-up control valve includes a spring biasing the spool toward a first position where the lock-up clutch is released. The spring allows movement of the spool toward a second position where the lock-up clutch is engaged when the first and second pressure acting areas are subject to the hydraulic pressures.

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patent: 4607731 (1986-08-01), Sugano

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