Patent ID: 6236928
Filing Date: 2001-05-22
Classification: B60T

Abstract:
A method for determining a quantity, which represents the traction resistance for a motor vehicle, said motor vehicle having a drive train including rotatable elements arranged in said drive train including at least one of a vehicle engine, engine ancillary equipment, a clutch, a torque converter, a transmission variable with respect to its transmission ratio, a differential and vehicle wheels, the method comprising the steps of:detecting an acceleration quantity (aL) which represents the instantaneous acceleration of said vehicle;separately determining a rotation quantity (mdmrot, mdnarot, mdwrote, mdwrota, mdgrot, mddrot, mdrrot) representing the rotation torque of at least one of the elements mounted in said drive train;forming at least one of a wheel drive torque quantity (mdwheel) and a wheel power quantity (pwwheel) in dependence upon the determined rotational quantities, said wheel drive torque quantity (mdwheel) representing the torque outputted at the vehicle wheels and said wheel power quantity (pwwheel) representing the power outputted by the vehicle wheels;determining a reference quantity (aL,exp) for the acceleration of the vehicle in dependence upon at least one of the wheel drive torque quantity (mdwheel) and the wheel power quantity (pwwheel); and,determining said quantity, which represents the traction resistance for a motor vehicle, in dependence upon a comparison of the detected acceleration quantity (aL) with the determined reference quantity (aL,exp).