A controller and a control strategy for a hybrid electric vehicle having a traction motor between an engine and an automatic transmission include maintaining a bypass clutch of a torque converter in an engaged position and applying a motor torque from a traction motor to the torque converter such that slip of the torque converter does not otherwise reach zero while the bypass clutch is maintained in the engaged position.

A control system for a hybrid vehicle configured to limit a thermal damage to a starting clutch without generating a shock. The control system is applied to a vehicle in which a prime mover includes an engine, a first motor, and a second motor. In the vehicle, the first motor is connected to the engine, and a first clutch and a second clutch are disposed between the engine and drive wheels. A controller executes a transient slip control to cause the second clutch to slip while bringing the slipping first clutch into complete engagement if a temperature of the first clutch is high. If an engine speed is changed during execution of the transient slip control, the first motor generates a collection torque to suppress the change in the engine speed.

A hybrid drive device includes an internal combustion engine, an electric machine and an impulse start module which comprises two clutches and a flywheel mass. A method for operating the hybrid device includes opening the first clutch of the impulse-start module and establishing a start-up requirement for the internal-combustion engine. The method also includes closing the first clutch with the second clutch in an open or closed position for a start of the internal-combustion engine.

A method of controlling anti jerk of a vehicle, includes determining a correction factor based on a wheel slip amount of the vehicle, determining a corrected model speed from a predetermined model speed for a motor of the vehicle based on the correction factor and a motor speed of the vehicle from which a vibration component is removed, determining a vibration component based on the motor speed and the corrected model speed and generating an anti jerk torque based on the determined vibration component, and generating a final output torque of the motor based on a driver demand torque of the vehicle and the generated anti jerk torque.

A method and system for controlling an engine clutch of a P2 type parallel hybrid vehicle includes steps of: determining whether or not a learning mode entry condition is satisfied, depending on whether or not a kickdown shift occurs during performance of variable hydraulic control of an engine clutch and based on the degree to which slip of the engine clutch occurs, deriving and storing a learning hydraulic value for suppressing the slip that is to occur when the kickdown shift occurs during the performance of the variable hydraulic control in such a manner that the slip does not occur, when a vehicle state satisfies a predetermined learning mode entry condition, and computing a final hydraulic pressure by adding a hydraulic compensation value to a target hydraulic pressure, when the same kickdown shift situation occurs, and controlling the engine clutch using the computed final hydraulic pressure.

A method for operating a hybrid drive train of a motor vehicle (X) which has a combustion engine (VM), a transmission (G), an electric machine (EM), as well as a separation clutch (KO) positioned between the combustion engine (VM) and the electric machine (EM). During a purely electric drive operation in which the separation clutch (KO) is disengaged and, when a gear is selected in the transmission (G), and during expectation, reaching, or exceeding a rotational speed difference of the separation clutch (KO) is larger or equal to a limit value, and/or in an expectation, reaching, or exceeding a rotational speed limit of the electric machine (EM), the separation clutch (KO) is engaged. Further, an electronic control unit (ECU) executes the method and a motor vehicle (X) having such an electronic control unit (ECU).

A method for controlling a starting process of a vehicle includes activating a control sequence and setting a control sequence signal, defining a maximum engine drive torque, and detecting a drive request for a starting process. The method further includes, in response to the drive request, controlling a clutch-gearbox unit with an engagement process duration, controlling wheel slip of driven wheels by determining wheel speeds of the driven wheels and at least setting an output drive torque at the output shaft, and redefining the maximum engine drive torque depending on the wheel slip and a driving speed. The method also includes deactivating the control sequence and resetting the control sequence signal when limit values are reached.

A method for operating a hybrid drive train of a motor vehicle (X) which has a combustion engine (VM), a transmission (G), an electric machine (EM), as well as a separation clutch (KO) positioned between the combustion engine (VM) and the electric machine (EM). During a purely electric drive operation in which the separation clutch (KO) is disengaged and, when a gear is selected in the transmission (G), and during expectation, reaching, or exceeding a rotational speed difference of the separation clutch (KO) is larger or equal to a limit value, and/or in an expectation, reaching, or exceeding a rotational speed limit of the electric machine (EM), the separation clutch (KO) is engaged. Further, an electronic control unit (ECU) executes the method and a motor vehicle (X) having such an electronic control unit (ECU).

A hybrid drive device includes an internal combustion engine, an electric machine and an impulse start module which comprises two clutches and a flywheel mass. A method for operating the hybrid device includes opening the first clutch of the impulse-start module and establishing a start-up requirement for the internal-combustion engine. The method also includes closing the first clutch with the second clutch in an open or closed position for a start of the internal-combustion engine.

A control system for a hybrid vehicle configured to limit a thermal damage to a starting clutch without generating a shock. The control system is applied to a vehicle in which a prime mover includes an engine, a first motor, and a second motor. In the vehicle, the first motor is connected to the engine, and a first clutch and a second clutch are disposed between the engine and drive wheels. A controller executes a transient slip control to cause the second clutch to slip while bringing the slipping first clutch into complete engagement if a temperature of the first clutch is high. If an engine speed is changed during execution of the transient slip control, the first motor generates a collection torque to suppress the change in the engine speed.