Scania Cv Ab

Scania Cb Ab

Peter Juhlin-Dannfelt

Fredrik Swartling

Mikael Öun

Anders Larsson

Peter Asplund

Richard Boström

Johan Kingstedt

Mikael Hanson

A method for control of an automatically controlled clutch when setting a vehicle in motion on a running surface: the vehicle includes a combustion engine for generating driving force transmitted to at least one powered wheel, and a throttle control for demanding driving force from the engine. The magnitude of the driving force demanded from the engine is controlled by a driver of the vehicle by means of the throttle control. The method includes a step, when a first criterion representing the grip of the powered wheels on the running surface is fulfilled, of opening the automatically controlled clutch if the driver uses the throttle control to reduce the demand for driving force from the engine.

Method and system for control of a clutch

A method for control of a vehicle gearbox which is automatically controlled by a control system. The control system's choice of transmission ratio is influenceable by the vehicle's driver. The control system chooses an initial transmission ratio for moving off stationary. The method includes determining a first initial transmission ratio by using the control system, and determining a second initial transmission ratio indicated by the vehicle driver. The gearbox is set to the second initial transmission ratio indicated by the driver when the second ratio is higher than the first initial transmission ratio determined by the control system.

Method and system for control of a gearbox

A method for determining the contact point for a clutch in a vehicle comprising an engine, a clutch, powered wheels and a gearbox. The gearbox has a first gearbox component which is connected to the clutch and disconnectable from the powered wheels. The method steps include estimating () a friction torque for the first gearbox component, whereby the torque transmitted by the clutch is a function of estimated friction torque, closing () the clutch, whereby a representation of a torque transmitted by the clutch is determined for a plurality of positions for the clutch, determining () the contact point by means of the determined representation of torque transmitted, and the further step (), before the closure of the clutch, of accelerating the first gearbox component if its rotation speed is below a certain value. Also a system and a vehicle for performing the method are disclosed.

Method and system for determining the contact point for a clutch in a vehicle

A method for opening of an automatically controlled clutch () of a vehicle which comprises a combustion engine () for generating driving force intended for transmission to at least one powered wheel () via the clutch and a gearbox (). The method includes opening the clutch at an initial rate to at least a first position substantially corresponding to a position at which the clutch can at most transmit the maximum torque which the combustion engine can deliver at idling speed, and from the first position, opening the clutch at a second rate which is lower than the initial rate.

Method and system for opening of a clutch

A method for setting a vehicle in motion: The vehicle includes a combustion engine for generating driving force for transmission to at least one powered wheel via a clutch and a gearbox. The driving force is selectively transmitted from the engine to the powered wheels by closure of the clutch. Gear changes by the gearbox are at least partly controlled by a control system. With the clutch closed and upon demand for the vehicle to be set in motion with the clutch closed, the control system activates the vehicle's starter motor with gear engaged, and uses the starter motor to accelerate the combustion engine to an initial speed which represents a speed at which the combustion engine will start.

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Hägersten, Sweden

Peter Juhlin-Dannfelt