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Control system for controlling the line pressure in a continuously variable transmission

  • US 4,982,822 A
  • Filed: 12/01/1986
  • Issued: 01/08/1991
  • Est. Priority Date: 12/01/1986
  • Status: Expired due to Fees
First Claim
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1. A line pressure control system for controlling the line fluid pressure in a continuously variable transmission, in which fluid under line pressure is controlled to produce an adjustable clutch fluid pressure for operating a clutch to transfer drive torque from an engine and through the transmission to an associated drivetrain, including a pressure transducer operable to sense the clutch pressure applied to the clutch, and having a closed loop clutch controller which responds to the sensed clutch pressure to effect closed loop control of the clutch, said control system comprising:

  • a closed loop line pressure controller, including the closed loop clutch controller, which responds to the clutch pressure sensed by the pressure transducer after the clutch is fully applied and is locked up, and becomes operable to effect closed loop control of the line pressure to a desired setpoint.

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