IMPROVEMENTS IN OR RELATING METHOD OF FITTING OPERATING CONDITIONS OF AN INTERNAL COMBUSTION ENGINE

摘要

The method is for operating a four-stroke cycle diesel engine supercharged by an exhaust gas-driven turbocompressor with valve timing giving a partial overlap of the opening periods of the exhaust and intake valves, with early intake closure and partial exhaust closure for the major part of the intake step. This is followed by partial reopening of the exhaust and its final closure near bottom dead center after closure of the intake valve. At low and medium engine powers part of the super-charged intake air is bypassed to an end of an exhaust manifold. The cylinder filling factor and combustion air excess are thereby increased and the exhaust valve temperature is reduced.