Over expanded two-stroke engines

Details Over expanded two-stroke engines Over expanded two-stroke engines

2006-10-03

2006-10-03

Huynh, Hai (Department: 3747)

Internal-combustion engines

Combustion chamber means having fuel injection only

Having a particular relationship between injection and...

C123S559100

Reexamination Certificate

active

07114485

ABSTRACT:
A method for combusting fuel in an engine involving decreasing a first volume of a homogeneous lean fuel/air charge to a second volume, in two stages, while increasing the pressure and temperature of that charge (a compression process having a chosen compression ratio), then increasing the pressure at constant volume while adding heat until a predetermined temperature is obtained, increasing the third volume of gas to a fourth volume, in two stages while decreasing the pressure at the predetermined temperature (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete an over expanded, cycle. Also disclosed is an engine employing said over expanded, two-stroke HCCI cycle.

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