Lockup control system for an automatic transmission torque conve

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

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74733, 192 329, F16H 4502, F16D 4702

Patent

active

047686324

ABSTRACT:
In an automotive automatic transmission, a torque converter lockup control system includes a main regulator valve connected to the discharge of a hydraulic pump for supplying converter feed pressure between the plates of the lockup clutch in accordance with the magnitude of line control pressure produced as a result of a line control pressure command applied to the windings of a solenoid-operated valve in response to a computer command signal. A converter cooler circuit includes a relief valve that opens at a relatively low pressure and communicates through a clutch control valve to the torque converter casing in accordance with the magnitude of lockup clutch control pressure produced by a solenoid-operated lockup clutch control valve. A converter regulator valve regulates converter feed pressure by opening the connection to the relief valve as lockup clutch pressure rises.

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