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US 6,782,984 B2Granted
Control method for lockup clutch
AssigneeAisin Seiki Kabushiki Kaisha
InventorsKazutoshi Tsunekawa, Yuuki Ohta
Life of this patent
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Abstract
A control method of a lockup clutch includes eliminating a loss stroke of a piston by a pre-charge of a supplied hydraulic pressure, increasing a force applied to the piston by further supply of the hydraulic pressure after the pre-charge, controlling a slip rotation speed between a pump impeller and a turbine runner in a torque converter connected to an automatic transmission, and determining a time for performing the pre-charge when a shift stage of the automatic transmission is under a neutral state and a vehicle is substantially stopped.
Claims7
A control method of a lockup clutch comprising:
- eliminating a loss stroke of a piston by a pre-charged hydraulic pressure;
- increasing a force applied to the piston by further supply of the hydraulic pressure after the pre-charge;
- controlling a slip rotation speed between a pump impeller and a turbine runner in a torque converter connected to an automatic transmission;
- and
- determining a time for performing the pre-charge when a shift stage of the automatic transmission is under a neutral state and a vehicle is substantially stopped.
2 more elements
Dependencies are inferred from the claim text.