Cao cycles of internal combustion engine with increased...

Details Cao cycles of internal combustion engine with increased... Cao cycles of internal combustion engine with increased...

2007-03-12

2009-12-01

Cronin, Stephen K (Department: 3747)

Internal-combustion engines

Six-cycle

C123S0480AA, C123S021000, C123S258000

Reexamination Certificate

active

07624709

ABSTRACT:
This invention provides an internal combustion engine that has a substantially increased expansion ratio, a variable compression ratio, and subsequently a significantly improved thermal efficiency. This improvement in thermal efficiency is attained without involving a complex mechanical structure or an enlarged engine size. The engine comprises at least a piston and cylinder assembly including a piston reciprocatingly mounted within the cylinder space, and at least two combustion chambers associated with said cylinder, each said combustion chamber having a port leading to said cylinder space and a combustion-chamber valve, said valve opens and closes said port to establish or block the communication between said combustion chamber and cylinder space, wherein said internal combustion engine is adapted to operate on preferred cycles in accordance with load conditions to substantially increase the engine's expansion ratio or provide a variable compression ratio mechanism under part load conditions. For an engine having two combustion chambers associated with each cylinder, the expansion ratio or compression ratio may be nearly doubled. Additionally, a cold start mechanism particularly for an engine operating on alternative fuels, such as ethanol or methanol, and engine valves that are operationally suitable for the engine cycles in accordance with the present invention are disclosed.

REFERENCES:
patent: 4369747 (1983-01-01), Jahoda
patent: 4799465 (1989-01-01), Yanagisawa et al.
patent: 4809511 (1989-03-01), Bajulaz
patent: 4875445 (1989-10-01), Imoto et al.
patent: 5115775 (1992-05-01), Gruenwald
patent: 5195469 (1993-03-01), Syed
patent: 5237964 (1993-08-01), Tomoiu

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