Lockup control system for automatic transmission

192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch

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477168, 747321, F16H 6114

Patent

active

057019827

ABSTRACT:
A lockup control system for an automatic transmission is provided with an electromagnetic valve 11 and a spool valve 13. When the electromagnetic valve 11 is inactive, the spool valve 13 is set so that a pressure at an OFF port 171 of a torque converter 12 is higher than that of an ON port 172, thereby opening a lockup clutch mechanism 19. When the electromagnetic valve 11 is activated, its control pressure Pc becomes lower than a secondary pressure PL2and the spool valve 13 is actuated so that the control pressure Pc is supplied to a clutch control chamber 18. As a result, the lockup clutch mechanism 19 is closed, thereby setting the lockup state. At this time, the control pressure Pc acts directly on the clutch control oil chamber 18, so that the lockup clutch mechanism 19 is controlled with high precision.

REFERENCES:
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patent: 4664235 (1987-05-01), Yokoyama et al.
patent: 4989702 (1991-02-01), Yoshimura et al.
patent: 5082095 (1992-01-01), Imamura
patent: 5090527 (1992-02-01), Imamura et al.
patent: 5152386 (1992-10-01), Imamura
patent: 5226513 (1993-07-01), Shibayama
patent: 5305862 (1994-04-01), Gierer

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