Patent ID: 7640911

Claim:
A spark induced, two-stroke HCSI cycle for operating an HCSI engine comprising: a compression process 1 - 2 - 3 , said compression process 1 - 2 - 3 further comprising: a first compression process 1 - 2 carried out via a crankcase compressor; and a second compression process 2 - 3 carried out by changing the volume of a cylinder of said engine; a fuel injection process taking place in a tube connecting said crankcase compressor to said cylinder, after said first compression process 1 - 2 , wherein fuel is injected into hot partially compressed gas providing homogeneous charge to the cylinder at all loads; a heat addition process 3 - 4 carried out via a spark triggering ignition of the compressed homogenous charge; an adiabatic expansion process 4 - 5 ; a heat removal process 5 - 6 - 1 , said heat removal process 5 - 6 - 1 further comprising: a first heat removal process 5 - 6 under a constant volume; and a second heat removal process 6 - 1 under constant pressure; wherein said compression process, said heat addition process, said adiabatic expansion process, and said heat removal process combine to form a two-stroke homogenous charge spark- ignition HCSI cycle 1 - 2 - 3 - 4 - 5 - 6 - 1 .