Control method for continuously variable transmission
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorJin Young HWANG
Life of this patent
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Abstract
A control method for a continuously variable transmission is disclosed to improve shifting stability. The control method may include: determining by a controller whether a shift by controlling the pulley is required, determining whether the control of the pulley for the shift generates a pressure fluctuation which is greater than or equal to a predetermined level, calculating a required hydraulic pressure varying amount for varying a hydraulic pressure to a target hydraulic pressure, adding additional hydraulic pressure to the required hydraulic pressure varying amount so as to increase the hydraulic pressure, and decreasing the increased hydraulic pressure to the target hydraulic pressure.
Claims11
A control method for a continuously variable transmission (CVT), which controls a pulley by using hydraulic pressure so as to perform shifting, the control method comprising:
- determining, by a controller, whether a shift by controlling the pulley is required;
- determining, by the controller, whether the control of the pulley for the shift generates a pressure fluctuation which is greater than or equal to a predetermined level;
- calculating, by the controller, a required hydraulic pressure varying amount for varying a hydraulic pressure to a target hydraulic pressure;
- adding, by the controller, an additional hydraulic pressure to the required hydraulic pressure varying amount so as to increase the hydraulic pressure;
- and
- decreasing, by the controller, the increased hydraulic pressure to the target hydraulic pressure.
Dependencies are inferred from the claim text.