Scania Cv Ab

Niclas Lerede

Henrik Flemmer

Martin Evaldsson

Johan Tunhag

Disclosed is a system for regulation of torque demanded from a prime mover of a vehicle, which prime mover responds to the torque demanded by delivering a dynamic torque. This dynamic torque is related by a gear ratio to a dynamic wheel torque which a power train comprising the prime mover imparts to at least one tractive wheel of the vehicle. The system regulates the torque demanded in such a way that a difference between the torque demanded and the dynamic torque is actively limited by employing feedback of the dynamic torque at an earlier time. The torque demanded at a time (t) for the regulation is limited to a maximum value which exceeds the dynamic torque at an earlier time by an offset value. The torque demanded is continuously varied according to the dynamic torque, so that power train oscillations in the vehicle are reduced in number and/or magnitude.

Control of a requested torque in a vehicle

A method for damping a power train oscillation in a vehicle provided with a prime mover which rotates at a speed &#x3c9;. A vibration change S in the rotation speed &#x3c9; of the prime mover is determined. There is deemed to be a power train oscillation if for a predetermined number of times the amplitude of the vibration change S is alternately above a positive threshold value Thand below a negative threshold value Thand if all of the consecutive upward crossings of the positive threshold value Thand downward crossings of the negative threshold value Thare separated by a time shorter than a predetermined period T.

Detection of power train oscillations

A method for damping of a power train oscillation in a vehicle provided with a prime mover which delivers a torque related to a torque request M from a vehicle system and rotates at a speed &#x3c9;. A cyclic variation S in the rotation speed &#x3c9; of said prime mover is determined. The torque request M is then given an oscillation-damping characteristic by use of the cyclic variation S, making it possible for the power train oscillation to be effectively damped out.

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Södertälje, Sweden

Niclas Lerede