Title:
HIGH EFFICIENCY ENGINE WITH VARIABLE COMPRESSION RATIO AND CHARGE (VCRC ENGINE)
Document Type and Number:
WIPO Patent Application WO2002044537
Kind Code:
A8
Abstract:
An internal combustion engine using variable compression ratio and variable fuel supply to one of two combustion chambers is presented. Varying the compression ratio is accomplished by changing the volume of a single combustion chamber (53) with an auxiliary piston (57) that is biased in an open position by spring (58). This, in combination with lean burning, results in a highly efficient prime mover particularly at the low torque outputs needed in passenger car applications. The relationship of compression ratio and fuel feed is varied with engine speed. Burning occurs in two stages, and this results in a clean exhaust. The invention allows very efficient throttling of two-cycle engines to be realized. A concept for supplying air to a two-cycle engine at very good efficiencies is also presented. The combination of these techniques can result in an engine for automotive use that is half the weight of conventional units with a thermal efficiency of 40 % or more at average engine output.
Inventors:
COWANS KENNETH W (US)
Application Number:
PCT/US2001/044487
Publication Date:
July 11, 2002
Filing Date:
November 29, 2001
Export Citation:
Assignee:
COWANS KENNETH W (US)
International Classes:
F02D43/00; F02B25/18; F02B37/04; F02B75/04; F02D15/04; F02D23/00; F02D23/02; F02D41/02; F02B1/12; F02B75/02; (IPC1-7): F02B75/04
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