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Method for controlling continuously variable transmission

  • US 4,663,990 A
  • Filed: 01/27/1986
  • Issued: 05/12/1987
  • Est. Priority Date: 05/23/1983
  • Status: Expired due to Term
First Claim
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1. A method for controlling a continuously variable transmission in a vehicle, said vehicle including an engine, a means for detecting throttle opening, a memory means for storing at least one relationship between desired engine speed and throttle opening and for storing a value indicative of a predetermined amount of throttle opening for said at least one relationship, said desired engine speed in said at least one relationship being maintained at a constant value when said means for detecting throttle opening detects a throttle opening which is less than said predetermined amount of throttle opening in said at least one relationship, said constant value being greater than a value corresponding to a point on said at least one relationship at which said continuously variable transmission is adjusted to a maximum speed ratio, said transmission including a hydraulic cylinder actuating a movable member of a driving pulley, and a flow control means for controlling the amount of fluid supplied into the hydraulic cylinder, the method comprising the steps of:

  • detecting an actual engine speed;

    detecting the throttle opening;

    determining a desired engine speed according to said at least one relationship;

    calculating a difference between the determined desired engine speed and the detected actual engine speed;

    comparing the absolute value of said calculated difference with a predetermined constant stored in the memory means; and

    when the predetermined constant is equal to or smaller than the absolute value of the calculated difference, outputting a control signal to the flow control means for controlling the amount of fluid supplied to the hydraulic cylinder.

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