Method and device for controlling a creep operation of a vehicle with a hybrid drive
First Claim
1. A method for controlling a creeping operation of a vehicle with a hybrid drive, with a parallel hybrid drive train, comprising an internal combustion engine, at least one electric motor, a first shifting component designed as a frictional component that is arranged between the combustion engine and the electric motor, a transmission, an output and a second shifting component designed as a frictional component that is arranged between the electric motor and the output, characterized in that to realize the creeping operation with running internal combustion engine, the two shifting components are simultaneously operated in slip operation, with an overall friction output that is required to produce a desired creeping moment is variably distributed to the two shifting components, wherein the distribution of the overall friction output to the two shifting components is performed using a rotational speed control of the electric motor, by means of which the power dissipating moment of the shifting components, which are correlated with the individual frictional moments, are set, with the electrical motor speed (nEM) is varied in a speed range between a transmission input speed (nGE) as a lower limit, and a combustible engine speed (nVM) as an upper limit.
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Abstract
The invention relates to a method and device for controlling a creep operation of a vehicle with a hybrid drive (1), comprising a parallel hybrid drivetrain (2), with an internal combustion engine (3), at least one electric motor (5), a first switching element (4) in the form of a friction element between the internal combustion engine (3) and the electric motor (5), a gearbox (7), an output (26) and a second switching element (6) arranged between the electric motor (5) and the output (26). According to the invention, a simple, effective and component-friendly continuous creeping can be achieved without additional constructional or economic costs can be achieved, wherein the creeping operation is carried out with the internal combustion engine (3) running and both switching elements (4,6) simultaneously operating with slip, wherein the total operating power required to generate a required creeping torque is variably distributed over both switching elements (4, 6).
58 Citations
9 Claims
- 1. A method for controlling a creeping operation of a vehicle with a hybrid drive, with a parallel hybrid drive train, comprising an internal combustion engine, at least one electric motor, a first shifting component designed as a frictional component that is arranged between the combustion engine and the electric motor, a transmission, an output and a second shifting component designed as a frictional component that is arranged between the electric motor and the output, characterized in that to realize the creeping operation with running internal combustion engine, the two shifting components are simultaneously operated in slip operation, with an overall friction output that is required to produce a desired creeping moment is variably distributed to the two shifting components, wherein the distribution of the overall friction output to the two shifting components is performed using a rotational speed control of the electric motor, by means of which the power dissipating moment of the shifting components, which are correlated with the individual frictional moments, are set, with the electrical motor speed (nEM) is varied in a speed range between a transmission input speed (nGE) as a lower limit, and a combustible engine speed (nVM) as an upper limit.
- 6. An apparatus for controlling a creeping operation of a vehicle with a hybrid drive, with a parallel hybrid drive train, comprising an internal combustion engine, at least one electric motor, a first shifting component designed as a frictional component that is arranged between the combustion engine and the electric motor, a transmission, an output and a second shifting component designed as a frictional component that is arranged between the electric motor and the output, characterized in that a control means to realize the creeping operation with running internal combustion engine are provided, by means of which the two shifting components are simultaneously operated in slip operation, with an overall friction output that is required to produce a desired creeping moment is variably distributed to the two shifting components, wherein the distribution of the overall friction output to the two shifting components is performed using a rotational speed control of the electric motor, by means of which the power dissipating moment of the shifting components, which are correlated with the individual frictional moments, are set, with the electrical motor speed (nEM) is varied in a speed range between a transmission input speed (nGE) as a lower limit, and a combustible engine speed (nVM) as an upper limit.
Specification