Scania Cv Ab

Anders Jensen

Roger Hälleberg

Ulf Carlsson

Peter Wansölin

A method for control of a vehicle's gearbox which is connected to a combustion engine and can be set to a number of different transmission ratios. When the vehicle is running in a low transmission ratio and at an engine speed below that at which the torque plateau for the low ratio is reached, in a situation where there is a reduced need for power output to propel the vehicle, determine a speed parameter for the vehicle, switch the gearbox to a higher transmission ratio than the low ratio when the speed parameter fulfills a first criterion.

Method and system for driving of a vehicle

A method for driving a vehicle in which a gearbox connected to a combustion engine can be set to various different transmission ratios including a low transmission ratio in which the engine speed is below that at which a torque plateau for the low ratio is reached. The vehicle may drive in a first mode or a second mode both at the low ratio, such that in the first mode, the vehicle is driven without fuel supply to the engine and in the second mode, the engine is provided with fuel supply in order to deliver motive force for propulsion of the vehicle. In the method one determines whether the vehicle should be driven according to the first mode or the second mode, based on a need for motive force.

A method for driving a vehicle which has a gearbox connected to a combustion engine and the gearbox is capable of being set to a number of different transmission ratios in order to deliver motive force to a driveshaft for propulsion of the vehicle. The vehicle is arranged for driving in at least a first mode and a second mode, such that in the first mode the gearbox is switched to a low transmission ratio and in the second mode the combustion engine is disconnected from the at least one driveshaft. When the vehicle is being driven in a situation where there is or will within a specific time be a reduced need for motive force for the vehicle, the method determines whether the vehicle should be driven according to the first mode or the second mode, on the basis of an ambient parameter.

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Gnesta, Sweden

Anders Jensen