Speed ratio controller and control method of toroidal continuously variable transmission
First Claim
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.
1 Assignment
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Accused Products
Abstract
In a toroidal continuously variable transmission for a vehicle, either of an automatic operation mode and a manual operation mode is selected by a driver via a selector lever (59). A speed ratio grade in the manual operation mode is also designated via the selector lever (59) by the driver. A controller (61) is programmed to control a speed ratio of the transmission to a target speed ratio corresponding to the designated speed ratio grade. The controller (61) is further programmed to prevent the speed ratio from varying after an input torque to the transmission has changed. This control may be realized by setting different target speed ratios for an identical speed ratio grade according to the input torque of the transmission.
16 Citations
13 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A speed ratio controller for use with a toroidal continuously variable transmission for a vehicle, to transmit an input torque from an engine to a drive wheel at an arbitrary speed ratio, said controller comprising:
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means for selecting either of an automatic operation mode and a manual operation mode of the transmission, means for designating a speed ratio grade in the manual operation mode, means for detecting the input torque of the transmission, means for detecting a real speed ratio of the transmission, means for calculating a target speed ratio according to the speed ratio grade designated by said speed ratio grade designating means, means for feedback controlling the speed ratio of the transmission such that said real speed ratio coincides with said target speed ratio, and means for preventing the speed ratio of the transmission from varying irrespective of said target speed ratio, after said input torque is varied.
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12. A speed ratio controller for use 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:
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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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13. A method for controlling a speed ratio of 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 transmission comprising a member for selecting either of an automatic operation mode and a manual operation mode of said transmission, and a member for designating a speed ratio grade in the manual operation mode, said method comprising:
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detecting the input torque of said transmission, detecting a real speed ratio of said transmission, calculating a target speed ratio according to the speed ratio grade designated by said speed ratio grade designating member, feedback controlling the speed ratio of said transmission such that said real speed ratio coincides with said target speed ratio, and preventing the speed ratio of said transmission from varying irrespective of said target speed ratio, after said input torque is varied.
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Specification