METHOD OF REDUCING EMISSIONS IN THE EXHAUST GASES OF AN INTERNAL COMBUSTION ENGINE

摘要

The invention relates to a method of reducing emissions in the exhaust gases of an internal combustion engine (1) which comprises at least one cylinder (2) to which an air/fuel mixture is supplied when a crankshaft (3) of the internal combustion engine (1) is to be made to rotate, at least one intake valve (4), at least one exhaust valve (6), and a piston (10) reciprocating between a top dead-centre position and a bottom dead-centre position in the cylinder (2). The method comprises the following steps: an air/fuel mixture with a lambda value greater than 1 is supplied to the cylinder (2), an electric motor/generator (17) connected to the crankshaft (3) maintains an essentially constant predetermined speed of the crankshaft (3), and the exhaust valve (6) is controlled so that it opens before the piston (10) has passed the bottom dead-centre position.