Shift control method for vehicle with DCT
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsSung Hyun Cho, Hwan Hur
Life of this patent
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Abstract
A shift control method for a vehicle with a double clutch transmission (DCT) is configured such that when a power-on upshift is initiated, during a target time for a controller to perform a torque phase, a release-side clutch is gradually released, an engine torque is gradually increased to a basic engine torque or more, and an engagement-side clutch torque is increased according to an increase in the engine torque and a vehicle speed; and when the release-side clutch is completely released, the controller reduces the engine torque while gradually reducing the engagement-side clutch torque to be equal to the basic engine torque, to perform an inertia phase such that an engine speed is synchronized with an engagement-side clutch speed.
Claims10
A shift control method for a vehicle with a double clutch transmission (DCT), the control method comprising:
- an initiation determination step of determining, by a controller, when a power-on upshift is initiated;
- a handover step of, during a target time for the controller to perform a torque phase, releasing, by the controller, a release-side clutch, increasing, by the controller, an engine torque from a predetermined engine torque to a corrected engine torque in consideration of a gear ratio difference between a current gear and a target gear, and controlling, by the controller, an engagement-side clutch using an engagement-side clutch torque determined in consideration of the corrected engine torque and a vehicle speed;
- and
- when the handover step is completed, a synchronization step of reducing, by the controller, the engine torque while controlling the engagement-side clutch in consideration of a torque difference, which is a difference between the corrected engine torque and the engagement-side clutch torque at completion of the handover step, to perform an inertia phase such that an engine speed is synchronized with an engagement-side clutch speed.
A shift control method for a vehicle with a double clutch transmission (DCT), the control method comprising:
- when a power-on upshift is initiated, during a target time for a controller to perform a torque phase, releasing, by the controller, a release-side clutch, increasing, by the controller, an engine torque to a predetermined engine torque or more than the predetermined engine torque, and increasing, by the controller, an engagement-side clutch torque according to an increase in the engine torque and a vehicle speed;
- and
- when the release-side clutch is completely released, the controller is configured to reduce the engine torque while reducing the engagement-side clutch torque to be equal to the predetermined engine torque, to perform an inertia phase such that an engine speed is synchronized with an engagement-side clutch speed.
Dependencies are inferred from the claim text.