Method for operating a drive train for a mobile vehicle
AssigneeZF Friedrichshafen AG
InventorJürgen LEGNER
Life of this patent
Estimating the term…
Abstract
With a torque-controlled internal combustion engine and a variable-speed transmission having fixed shift gear ratios, during a shift, the internal combustion engine is controlled in such manner that the drive output torque of the transmission remains the same before and after the shift.
Claims10
1-8. (canceled)
A method of operating a drive-train of a mobile vehicle with an internal combustion engine and a transmission having at least two shiftable gear ratios for powering a driving operation such that, when the transmission is shifted, the transmission shifts from a first fixed gear ratio to a second fixed gear ratio, the method comprising:
- controlling the internal combustion engine with an electronic control unit so that as the engine is operated in a torque-controlled manner a function of a position of an accelerator pedal;
- during a shift from the first fixed gear ratio to the second fixed gear ratio, and with the accelerator pedal position unchanged, the electronic control unit controls torque as a function of a gear ratio change in such manner that the torque of the internal combustion engine is either increased or reduced such that the torque of the transmission delivered remains the same.
A method of operating a drive-train of a mobile vehicle with an internal combustion engine and a transmission having at least first and second shiftable fixed gear ratios for powering a driving operation, the method comprising:
- initiating a transmission gear shift from the first fixed gear ratio to the second fixed gear ratio;
- controlling a torque of the internal combustion engine with an electronic control unit as a function of a position of an accelerator pedal;
- and
- during the transmission gear shift from the first fixed gear ratio to the second gear ratio, and when the position of the accelerator pedal is unchanged, controlling the torque of the internal combustion engine with the electronic control unit as a function of a gear ratio change such that the torque of the internal combustion engine is either increased or reduced to maintain an unchanging torque output of the transmission.
Dependencies are inferred from the claim text.