METHOD FOR OPERATING A DRIVE TRAIN
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Abstract
A method for operating a drive train of a motor vehicle. The drive train comprising a hybrid drive with an internal combustion engine and an electric motor, a transmission arranged between the hybrid drive and a drive output, and a clutch arranged between the internal combustion engine and the electric motor. The internal combustion engine is started by engaging the clutch only when the electric motor is providing drive power. In this situation when shifting gears in the transmission with interruption of the traction force, immediately after the gear change and during a load build-up phase of the shift operation, the internal combustion engine is started by the electric motor without traction force interruption. The clutch is controlled to partially engage to start the combustion engine and then it is completely disengaged before reaching a synchronous speed between the combustion engine and the electric motor.
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Citations
17 Claims
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1-8. -8. (canceled)
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9. A method of operating a drive train of a motor vehicle, the drive train comprising a hybrid drive with an internal combustion engine and an electric motor, a transmission being arranged between the hybrid drive and a drive output, and a clutch being arranged between the internal combustion engine and the electric motor, in which, when only the electric motor is working, the internal combustion engine is started by engaging the clutch between the internal combustion engine and the electric motor, the method comprising the steps of:
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when, during electric motor powered driving with the electric motor running and the internal combustion engine idle, carrying out a shift operation in the transmission to change gear with an interruption of the traction force, immediately after the gear change of the shift operation and during a load build-up phase of the shift operation, starting the internal combustion engine with the electric motor without a traction force interruption by engaging and disengaging the clutch, arranged between the internal combustion engine and the electric motor, in a controlled manner such that by being partially engaged the clutch is brought to a slipping condition for starting the internal combustion engine, and then completely disengaging the clutch again before reaching a synchronous speed between the internal combustion engine and the electric motor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for starting an internal combustion engine of a drive train of a hybrid drive motor vehicle when the internal combustion engine is idle and the electric motor is exclusively providing drive power to the drive train, the drive train comprising a hybrid drive with the internal combustion engine and an electric motor, a transmission being arranged between the hybrid drive and a drive output, and a clutch being arranged between the internal combustion engine and the electric motor, and the method comprising the steps of:
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carrying out a gear shift operation in the transmission which interrupts a traction force; controlling the clutch, arranged between the internal combustion engine and the electric motor, to partially engage and transmit drive to the internal combustion engine, immediately after a gear change in the gear shift operation to start the internal combustion engine without interruption of the traction force; and completely disengaging the clutch before the internal combustion engine and the electric motor reached a synchronous speed.
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Specification