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Speed ratio controller and control method of toroidal continuously variable transmission

  • US 6,183,390 B1
  • Filed: 07/14/1999
  • Issued: 02/06/2001
  • Est. Priority Date: 07/27/1998
  • Status: Expired due to Term
First Claim
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1. A speed ratio in combination controller with a toroidal continuously variable transmission for a vehicle, said transmission transmitting an input torque from an engine to a drive wheel at an arbitrary speed ratio, said controller comprising:

  • a member for selecting either of an automatic operation mode and a manual operation mode of said transmission, a member for designating a speed ratio grade in the manual operation mode, a sensor for detecting the input torque of said transmission, a sensor for detecting a real speed ratio of said transmission, and a microprocessor programmed to;

    calculate a target speed ratio according to the speed ratio grade designated by said speed ratio grade designating member, feedback control the speed ratio of said transmission such that said real speed ratio coincides with said target speed ratio. and prevent the speed ratio of said transmission from varying irrespective of said target speed ratio, after said input torque is varied.

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