Control device and control method for continuously variable transmission
AssigneeJATCO Ltd
InventorsNoritaka Aoyama, Hideshi Wakayama, Naohiro Yamada, Keichi Tatewaki, Kousuke Waku
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Abstract
A control device for continuously variable transmission is composed of a continuously variable transmission mechanism and friction engagement elements, and includes a control unit for decreasing, during a coast stop control to stop a driving power source in a traveling state of a vehicle, a transmission torque capacity transmittable by the friction engagement elements to fall under a belt capacity being torque transmittable by a belt using a holding force of pulleys.
Claims10
A control device for a continuously variable transmission, being mounted on a vehicle and provided with a continuously variable transmission mechanism for changing a speed ratio by changing a winding diameter of a belt held by an oil pressure supplied to pulleys, and at least one friction engagement element connected to the continuously variable transmission mechanism in order to allow transmission of a driving force of a driving power source continuously, comprising:
- a control unit adapted to decrease, during a coast stop control to stop the driving power source in a traveling state of the vehicle, a transmission torque capacity that is torque transmittable by the at least one friction engagement element to fall under a belt capacity that is torque transmittable by the belt using a holding force of the pulleys by setting an indicated pressure applied to the at least on friction engagement element to a zero point.
A control method for a continuously variable transmission, for changing a speed ratio by changing a winding diameter of a belt held by an oil pressure supplied to pulleys, and at least one friction engagement element connected to the continuously variable transmission mechanism in order to allow transmission of a driving force of a driving power source continuously, comprising:
- decreasing, during a coast stop control to stop the drive power source in a traveling state of the vehicle, a transmission torque capacity that is torque transmittable by the at least one friction engagement element to fall under a belt capacity that is torque transmittable by the belt using a holding force of the pulleys by setting an indicated pressure applied to the at least one friction engagement element to a zero point.
A control device for a continuously variable transmission, being mounted on a vehicle and provided with a continuously variable transmission mechanism for changing a speed ratio by changing a winding diameter of a belt held by an oil pressure supplied to pulleys, and at least one friction engagement element connected to the continuously variable transmission mechanism in order to allow transmission of a driving force of a driving power source continuously, comprising:
- means for decreasing a transmission torque capacity, during a coast stop control to stop the drive power source in a traveling state of the vehicle, the transmission torque capacity being torque transmittable by the at least one friction engagement element to fall under a belt capacity that is torque transmittable by the belt using a holding force of the pulleys by setting an indicated pressure applied to the at least one friction engagement element to a zero point.
Dependencies are inferred from the claim text.