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Method and apparatus for controlling line pressure of continuously variable transmission system

  • US 4,958,538 A
  • Filed: 08/08/1988
  • Issued: 09/25/1990
  • Est. Priority Date: 08/10/1987
  • Status: Expired due to Term
First Claim
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1. A method of controlling line pressure of a continuously variable transmission system, said transmission system being controlled by either expanding or contracting the width of the channel between a stationary pulley member and a movable pulley member which is movable toward and away from said stationary pulley member in order to either expand or contract the radius of rotation of a belt wound on said pulley members for eventually varying the transmission ratio, in which the method includes the steps of:

  • controlling line pressure by raising it by a specific amount in the presence of predetermined conditions when slipping of a clutch is detected during a drive mode so that optimum clutch engagement can eventually be implemented; and

    detecting of said presence of said predetermined conditions, said detecting step including the steps of;

    detecting of the occurrence of slipping of said clutch during said drive mode at a specific slipping rate higher than a lower limit value, anddetecting that the duration of said clutch slipping lasts for a specific period of time after passing of a certain period from the engagement of the clutch when the vehicle runs at a speed other than at a specific low speed below a predetermined velocity.

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