Scania Cv Ab

Niclas Gunnarsson

Andreas Dahl

Erik Höckerdal

Anders Larsson

Eric Olofsson

Michael Vallinder

Niklas Philipson

Cedric Nyberg

Henrik Skog

Provided is a method for changing gear ratio in a gearbox comprising: receiving a signal to change the gear ratio; calculating braking torque that the engine should provide to reduce the rotational speed of the engine to a target rotational speed; phase-shifting a second camshaft in relation to the crankshaft, to a state where the exhaust valve is controlled to be opened during the expansion stroke and closed during the exhaust stroke; disconnecting the engine from the driving wheel; opening and closing the exhaust valve with a decompression device in a transition area between an exhaust stroke and an inlet stroke and also between a compression stroke and an expansion stroke, when the piston is at a top dead center in the cylinder to achieve engine braking through compression in the cylinders during the exhaust stroke and the compression stroke, and f) shifting a gear in the gearbox.

Method for changing gear ratio in a gearbox of a vehicle

A four-stroke internal combustion engine is disclosed comprising an exhaust valve control arrangement with an exhaust valve phase-shifting device configured to phase-shift control of the at least one exhaust valve to a state where the at least one exhaust valve is controlled in such a way that it is opened during the expansion stroke of the engine and closed during the exhaust stroke of the engine, in order to achieve engine-braking via compression in the cylinders during the exhaust stroke. An inlet valve control arrangement comprises an inlet valve phase-shifting device configured to regulate the amount of air pumped through the engine during the engine braking by regulating the phase-shift of the at least one inlet valve. The present disclosure also relates to a vehicle comprising an engine and method of controlling an engine, a computer program and a computer program for performing a method of controlling an engine.

Four-stroke internal combustion engine thereto related vehicle and method

A method to control a four-stroke combustion engine, comprising at least one cylinder; a piston arranged in each cylinder; at least one inlet valve arranged in each cylinder which is connected with an inlet system; at least one first camshaft which controls each inlet valve; at least one exhaust valve arranged in each cylinder which is connected with an exhaust system; at least one second camshaft which controls each exhaust valve; and a crankshaft which controls each camshaft. At least one phase-shifting device is arranged between the crankshaft and the second camshaft, to phase-shift the second camshaft in relation to the crankshaft to a state, where the exhaust valve is controlled in such a way, that it is opened during the expansion stroke of the engine and closed during the exhaust stroke of the engine, to achieve engine braking through compression in the cylinders during the exhaust stroke.

Combustion engine, vehicle comprising the combustion engine and method for controlling the combustion engine

A valve lift device for a combustion engine, a camshaft (), a first unit () with a first contact device () in contact with a guide surface on the camshaft (), a motion-transmitting mechanism converting the lifting movement of the unit () to a lift of at least one valve () of the combustion engine. An adjusting device (-) allows linear movements of the first unit () and hence of the first contact device () in a plane which is perpendicular to the camshaft's rotational axis () between at least a first position of contact () with the guide surface () and a second position of contact () with the guide surface ().

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Huddinge, Sweden

Niclas Gunnarsson