Primary clutch electronic CVT
First Claim
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1. A method of controlling a continuously variable transmission of a vehicle, the vehicle including an engine operative to drive the continuously variable transmission, the method including:
- controlling, by transmission control logic, a first clutch of the continuously variable transmission of the vehicle to an initial fixed position in a manual mode of operation, the continuously variable transmission including the first clutch, a second clutch, and a belt coupled to the first and second clutches, the first clutch being adjustable to modulate a gear ratio of the continuously variable transmission, the first clutch of the continuously variable transmission in the manual mode of operation being adjustable between a plurality of discrete fixed positions based on shift requests initiated with a shift request device;
receiving a shift request identifying a target fixed position of the first clutch of the continuously variable transmission;
shifting the continuously variable transmission from the initial fixed position to the target fixed position; and
initiating a torque reduction of the engine during the shifting to reduce a torque generated by the engine, wherein at least one of a magnitude and a duration of the torque reduction is adjustable based on an operator input device.
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Abstract
A continuously variable transmission (CVT) is provided for use on a recreational or utility vehicle. The CVT is electronically controlled by at least one control unit of the vehicle. The CVT includes a primary clutch having a first sheave and a second sheave moveable relative to the first sheave. An actuator controls movement of the second sheave.
78 Citations
15 Claims
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1. A method of controlling a continuously variable transmission of a vehicle, the vehicle including an engine operative to drive the continuously variable transmission, the method including:
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controlling, by transmission control logic, a first clutch of the continuously variable transmission of the vehicle to an initial fixed position in a manual mode of operation, the continuously variable transmission including the first clutch, a second clutch, and a belt coupled to the first and second clutches, the first clutch being adjustable to modulate a gear ratio of the continuously variable transmission, the first clutch of the continuously variable transmission in the manual mode of operation being adjustable between a plurality of discrete fixed positions based on shift requests initiated with a shift request device; receiving a shift request identifying a target fixed position of the first clutch of the continuously variable transmission; shifting the continuously variable transmission from the initial fixed position to the target fixed position; and initiating a torque reduction of the engine during the shifting to reduce a torque generated by the engine, wherein at least one of a magnitude and a duration of the torque reduction is adjustable based on an operator input device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vehicle including:
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a chassis; a ground engaging mechanism configured to support the chassis; an engine supported by the chassis; a continuously variable transmission driven by the engine, the continuously variable transmission including a first clutch, a second clutch, and a belt coupled to the first and second clutches, the first clutch being adjustable to modulate a gear ratio of the continuously variable transmission; at least one controller configured to control a position of the first clutch of the continuously variable transmission in a manual mode of operation; a shift request device in communication with the at least one controller, wherein in the manual mode of operation the first clutch of the continuously variable transmission is shifted by the at least one controller between a plurality of discrete fixed positions based on shift requests initiated with the shift request device; and an operator input device in communication with the at least one controller, wherein the at least one controller is operative to initiate a torque reduction of the engine during a shift of the first clutch of the continuously variable transmission from an initial fixed position to a target fixed position, wherein at least one of a magnitude and a duration of the torque reduction is adjustable based on the operator input device. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification