Method for increasing the availability of a hybrid separating clutch in a hybrid drive train of a motor vehicle
AssigneeSchaeffler Technologies AG & Co. KG
InventorErhard Hodrus
Life of this patent
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Abstract
The invention relates to a method for increasing the availability of a hybrid separating clutch in a hybrid drive train of a motor vehicle, wherein the hybrid separating clutch is disposed between an internal combustion engine and an electric traction drive. In the method where even in the event of a fault the motor vehicle continues to be driven, the hybrid separating clutch is controlled by a hydrostatic actuator, and when a malfunction of the hydrostatic actuator is detected, for actuation of the hybrid separating clutch which is engaged in the non-actuated state, the last state of the hydrostatic actuator detected by a control mechanism is used for estimation of a minimum clutch torque which can be transmitted.
Claims12
A method for increasing an availability of a hybrid separating clutch in a hybrid drive train of a motor vehicle, in which the hybrid separating clutch is arranged between an internal combustion engine and an electric traction drive, the method comprising:
- controlling the hybrid separating clutch via a hydrostatic actuator,
- detecting an error of the hydrostatic actuator, wherein the hybrid separating clutch is closed in an idle state,
- using a most recent status of the hydrostatic actuator detected by a control device to estimate a minimal clutch torque configured to maintain a driving operation, wherein the minimal clutch torque is less than a maximum clutch torque,
- transmitting the minimal clutch torque from the control device to a superordinate control device jointly with a status signal associated with the minimal clutch torque, wherein the control device is connected to the hydrostatic actuator and detects the error, and
- setting the status signal to an estimated value,
- wherein in case of the status signal being set to the estimated value, the superordinate control device determines the maximum clutch torque by monitoring a slippage between the internal combustion engine and an electric motor of the electric traction drive while increasing the minimal clutch torque.
A method for increasing an availability of a hybrid separating clutch in a hybrid drive train of a motor vehicle, in which the hybrid separating clutch is arranged between an internal combustion engine and an electric traction drive, the method comprising:
- controlling the hybrid separating clutch via a hydrostatic actuator,
- detecting an error of the hydrostatic actuator, wherein the hybrid separating clutch is closed in an idle state,
- using a most recent status of the hydrostatic actuator detected by a control device to estimate a minimal clutch torque for maintaining a driving operation,
- transmitting the minimal clutch torque from the control device to a superordinate control device jointly with a status signal associated with the clutch torque that minimally is to be transmitted, wherein the control device is connected to the hydrostatic actuator and detects the error,
- setting the status signal to an estimated value when the minimal clutch torque is lower than a maximum clutch torque,
- wherein in case of the status signal being set to the estimated value, the superordinate control device determines the maximum clutch torque by monitoring a slippage between the internal combustion engine and an electric motor of the electric traction drive while increasing the minimal clutch torque.
Dependencies are inferred from the claim text.