Internal combustion engine and control method thereof

Abstract

Embodiments are disclosed to reliably carry out engine starting without cranking. Using an internal combustion engine, when an idle stop condition is established, a third path switching valvethat is provided at the connection of the compressed air supply pathand a first blow-by path, and a blow-by control valveare 'closed'. The connection of the crankcase to the inlet pathis blocked, idling for a designated time is carried out, and finally the engine is stopped. On the other hand, when the idle stop release condition is established, an inlet valveis 'opened', and the first to third path switching valvestoare “closed”, thereby operating a compressorfor a designated period of time. Compressed air is thereby supplied to the combustion chamberand the crankcase via the compressed air supply path, allowing an increase in the internal cylinder pressure. Finally, the engine is started.