Title: Control system for controlling line pressure in continuously variable transmission
Application Number: 87107229 Application Date: 1987.12.01
Publication Number: 1019258 Publication Date: 1988.06.29
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: F16D27/16;G05D15/01
Applicant(s) Name: Borg-Warner Co. (US) 200 South Michigan Avenue, Ch Address:
Inventor(s) Name: Werner Paul Petzold;William Paul Umlauf
Attorney & Agent: WU ZENGYONG WU BINGFENG
Abstract:
    A pressure transducer, which senses clutch pressure and effects closed loop clutch control in a continuously variable transmission, is used after the clutch is fully engaged to provide closed loop line pressure control to a desired setpoint, which line pressure regulates the tension on the belt in the transmission. Prior to lockup, the line pressure is governed by an open loop controller which establishes the line pressure at a level higher than that called for by the setpoint. This ensures that the line pressure will be high enough to provide the required tension on the belt so that it will not slip. After the clutch is engaged, the closed loop line pressure controller establishes the line pressure at the setpoint.
Time: 4
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