Daimler-benz Ag

Hans-Joachim Ohnemuller

Heinz Leiber

Klaus Kastner

A device for controlling at least one variable influencing the drive torque of a motor vehicle uses the difference between acceleration of a driven wheel and the vehicle longitudinal acceleration as a control variable. The exceeding of a slip threshold within specific time windows after the driven wheel speed has fallen below the threshold or after increasing the drive torque is used as a check for the correct dosage of drive torque and the slip threshold itself is adjusted depending on the vehicle longitudinal acceleration. This permits an optimum propulsive acceleration and the control device to adapt to changing road conditions.

Device for controlling the drive torque of a motor vehicle

A system for controlling at least one variable influencing the drive torque of an internal combustion engine of a motor vehicle, with an electronic throttle control, an electronic ignition timing control and a control device which becomes active when there is a tendency to spin of at least one driven wheel. The instantaneous engine speed is stored and the drive torque reduced to a certain value, assigned to the engine speed, and subsequently increased again, at a rate of rise dependent on the engine speed, when the tendency of spin of the driven wheel subsides. Consequently, major excess torque are avoided and greater traction and lateral control force is achieved.

System for controlling at least one variable influencing the drive

In a system for controlling the propulsion on motor vehicles, by a reduction of the drive torque by an intervention in ignition, carburator or fuel injection and/or brakes, includes a first device which reduces the drive torque when the maximum adhesion coefficient is exceeded, and a second device which reduces the drive torque to a value associated with the measured maximum value of the vehicle acceleration when the monitored wheel variable exceeds the threshold value, as a result of which too great an excess of torque is prevented and sufficient traction and cornering stability are retained without unnecessarily slowing down a propulsion of the motor vehicle.

Motor vehicle propulsion control when accelerating from a stationary

The proper functioning of a control system (such as an ABS, ASR) that secures the adhesion of the wheels, by analyzing wheel rotating speed signals, is determined by comparing acceleration signals determined from the wheel rotating speed signals with accelerated signals measured by acceleration sensors on the vehicle. If they do not correspond within given limits during absence of control system control signal, the control system is disabled by an error signal and a warning indicator is activated.

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Reutlingen, Germany

Hans-Joachim Ohnemuller