Vehicle lock-up clutch control device
AssigneeNissan Motor Co., Ltd.
InventorYuzuru Tohta
Life of this patent
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Abstract
A lock-up clutch control device is provided for a vehicle having a torque converter with a lock-up clutch disposed between an engine and a continuously variable transmission such that the occurrence of shocks during lock-up engagement is suppressed. The vehicle lock-up clutch control device is provided with a control unit that controls the lock-up capacity based on an engine torque signal when engaging the lock-up clutch. The control unit uses a predictive engine torque as the engine torque signal for use in the lock-up capacity control. The predictive engine torque is calculated based on an engine torque air response delay and a hydraulic response delay in the lock-up differential pressure and is faster in response than the actual engine torque.
Claims7
A vehicle lock-up clutch control device for a vehicle provided with a torque converter having a lock-up clutch between an engine and a transmission, the vehicle lock-up clutch control device comprising:
- a control unit programmed to include
- a lock-up capacity control that controls a lock-up capacity based on an engine torque signal, when engaging the lock-up clutch,
- the lock-up capacity control using a predictive engine torque as the engine torque signal, the predictive engine torque being calculated based on an engine torque air response delay and a hydraulic response delay in a lock-up differential pressure and being faster in response than actual engine torque, and
- the lock-up capacity control using time obtained by subtracting a lock-up differential pressure hydraulic response delay time from an engine torque air response delay time as a dead time, and calculates the predictive engine torque from an engine torque command value and the dead time.
Dependencies are inferred from the claim text.