Method for driving a vehicle with manually shifted transmission, automatic transmission or continuous transmission on streets with low friction value
First Claim
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1. A method for operating a motor vehicle with one of a manual transmission, multi-ratio automatic transmission or a continuously variable transmission on a road having a low friction coefficient, the method comprising the steps of:
- providing a standard driving program in a transmission control for controlling one of the manual transmission, multi-ratio automatic transmission or the continuously variable transmission according to a plurality of desired transmission gear ratios, including a transmission starting gear ratio;
switching from the standard driving program in the transmission control to a modified driving program for the mad having a low friction coefficient;
reducing an engine torque in the modified driving program to accordingly reduce a wheel drive torque without changing the engine speed; and
maintaining the transmission starting gear ratio of the standard driving program in the modified driving program.
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Abstract
A method for operating a motor vehicle with a manual transmission, a multi-ratio automatic transmission or a continuously variable transmission, on a road with a low friction coefficient, the engine torque is reduced or, as the case may be, decreased, which leads to a reduction of the wheel drive torque without changing the starting gear ratio.
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Citations
12 Claims
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1. A method for operating a motor vehicle with one of a manual transmission, multi-ratio automatic transmission or a continuously variable transmission on a road having a low friction coefficient, the method comprising the steps of:
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providing a standard driving program in a transmission control for controlling one of the manual transmission, multi-ratio automatic transmission or the continuously variable transmission according to a plurality of desired transmission gear ratios, including a transmission starting gear ratio; switching from the standard driving program in the transmission control to a modified driving program for the mad having a low friction coefficient; reducing an engine torque in the modified driving program to accordingly reduce a wheel drive torque without changing the engine speed; and maintaining the transmission starting gear ratio of the standard driving program in the modified driving program. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for operating a motor vehicle with a continuously variable transmission on a road having a low friction coefficient, the method comprising the steps of:
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providing a standard driving program in a transmission control for controlling the continuously variable transmission according to a plurality of desired transmission gear ratios, Including a transmission starting gear ratio; switching from the standard driving program in the transmission control to a modified driving program for the road having a low friction coefficient; reducing an engine torque in the modified driving program to accordingly reduce a wheel drive torque without changing the engine speed; and maintaining the transmission starting gear ratio of the standard driving program in the modified driving program. - View Dependent Claims (8)
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9. A method for operating a motor vehicle with one of a manual transmission, mult-ratio automatic transmission or a continuously variable transmission on a road having a low friction coefficient, the method comprising the steps of:
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providing a standard driving program defining an engine torque value as a function of at least a gas pedal value and an engine speed in a transmission control for controlling one of the manual transmission, multi-ratio automatic transmission or the continuously variable transmission according to a plurality of desired transmission gear ratios, including a transmission starting gear ratio; modifying the engine torque value to obtain a modified driving program having a reduced engine torque value and a reduced wheel torque value in comparison to the standard driving program; switching from the standard driving program in the transmission control to the modified driving program for the road having a low friction coefficient; and maintaining the transmission starting gear ratio of the standard driving program in the modified driving program. - View Dependent Claims (10, 11, 12)
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Specification