Method for controlling a hybrid drive
First Claim
1. A method for controlling a hybrid drive of a vehicle, having at least one internal combustion engine, at least one electric machine, a first clutch situated between the electric machine and a drive train of the vehicle, and a second clutch situated between the electric machine and the internal combustion engine, comprising:
- applying a predefinable clutch torque to the second clutch for a start of the internal combustion engine by the operating electric machine;
monitoring a rotational speed of the internal combustion engine; and
incrementing the clutch torque to a higher value if the rotational speed of the internal combustion engine is less than a predefinable threshold value within a predefinable time interval, wherein the clutch torque resulting in a successful start of the internal combustion engine is predefined as a setpoint value for a subsequent start of the internal combustion engine.
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Abstract
A method is for controlling a hybrid drive of a vehicle, which includes at least one internal combustion engine and at least one electric machine, having a first clutch situated between the electric machine and the drive train of the vehicle and a second clutch situated between the electric machine and the internal combustion engine. In the method, a predefinable clutch torque is applied to the second clutch for a start of the internal combustion engine by the operating electric machine, the rotational speed of the internal combustion engine is monitored, and the clutch torque is incremented to a higher value if the rotational speed of the internal combustion engine is less than a predefinable threshold value within a predefinable time interval.
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Citations
19 Claims
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1. A method for controlling a hybrid drive of a vehicle, having at least one internal combustion engine, at least one electric machine, a first clutch situated between the electric machine and a drive train of the vehicle, and a second clutch situated between the electric machine and the internal combustion engine, comprising:
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applying a predefinable clutch torque to the second clutch for a start of the internal combustion engine by the operating electric machine; monitoring a rotational speed of the internal combustion engine; and incrementing the clutch torque to a higher value if the rotational speed of the internal combustion engine is less than a predefinable threshold value within a predefinable time interval, wherein the clutch torque resulting in a successful start of the internal combustion engine is predefined as a setpoint value for a subsequent start of the internal combustion engine.
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2. A method for controlling a hybrid drive of a vehicle, having at least one internal combustion engine, at least one electric machine, a first clutch situated between the electric machine and a drive train of the vehicle, and a second clutch situated between the electric machine and the internal combustion engine, comprising:
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applying a predefinable clutch torque to the second clutch for a start of the internal combustion engine by the operating electric machine; monitoring a rotational speed of the internal combustion engine; and incrementing the clutch torque to a higher value if the rotational speed of the internal combustion engine is less than a predefinable threshold value within a predefinable time interval, wherein, for the start of the internal combustion engine, a setpoint value of a slip torque is predefined and a timing element predefining a time interval is simultaneously started, the rotational speed of the internal combustion engine is monitored, and when the start speed of the internal combustion engine is reached before elapse of the time interval predefined by the timing element, the setpoint value is changed. - View Dependent Claims (3)
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4. A method for controlling a hybrid drive of a vehicle, having at least one internal combustion engine, at least one electric machine, a first clutch situated between the electric machine and a drive train of the vehicle, and a second clutch situated between the electric machine and the internal combustion engine, comprising:
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applying a predefinable clutch torque to the second clutch for a start of the internal combustion engine by the operating electric machine; monitoring a rotational speed of the internal combustion engine; and incrementing the clutch torque to a higher value if the rotational speed of the internal combustion engine is less than a predefinable threshold value within a predefinable time interval, wherein, when a brief speed increase and a subsequent speed drop of the internal combustion engine is detected, a slip torque is immediately incremented to a higher value. - View Dependent Claims (5, 6)
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7. A method for controlling a hybrid drive of a vehicle, including at least one internal combustion engine, at least one electric machine, a first clutch situated between the electric machine and a drive train of the vehicle, and a second clutch situated between the electric machine and the internal combustion engine, comprising:
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applying a predefinable clutch torque to the second clutch for a start of the internal combustion engine by the operating electric machine; monitoring a rotational speed of the internal combustion engine; and decrementing the clutch torque to a lower value if the rotational speed of the internal combustion engine is greater than a predefinable threshold value within a predefinable time interval. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for controlling a hybrid drive of a vehicle, having at least one internal combustion engine, at least one electric machine, a first clutch situated between the electric machine and a drive train of the vehicle, and a second clutch situated between the electric machine and the internal combustion engine, comprising:
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when the first clutch is disengaged and thus the drive train of the vehicle is isolated from the electric machine and the internal combustion engine, increasing a slip value of the second clutch along a ramp until the internal combustion engine is started; and saving the slip value of the second clutch corresponding to the start of the internal combustion engine and a corresponding torque of the electric machine as setpoint values. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification