Patent ID: 6848416

Claim:
An over expanded, limited temperature cycle for operating an 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 an external compressor; and a second compression process 2 - 3 carried out by changing the volume of a cylinder of said engine; a heat addition process 3 - 4 - 5 , said heat addition process 3 - 4 - 5 further comprising: a first heat addition process 3 - 4 carried out via injection and combustion of fuel in said cylinder of said engine while maintaining a constant pressure; and a second heat addition process 4 - 5 carried out via injection and combustion of fuel in said cylinder while maintaining a constant, limiting temperature; an adiabatic expansion process 5 - 6 ; a heat removal process 6 - 7 - 1 , said heat removal process 6 - 7 - 1 further comprising: a first heat removal process 6 - 7 under a constant volume; and a second heat removal process 7 - 1 under constant pressure; wherein said compression process, said heat addition process, said adiabatic expansion process, and said heat removal process combine to form an over expanded, limited-temperature cycle 1 - 2 - 3 - 4 - 5 - 6 - 7 - 1 .