Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1985-05-10
1987-01-13
Wolfe, Jr., Willis R.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
123527, F02M 2506
Patent
active
046356096
ABSTRACT:
In a spark-ignited gas engine with relatively high compression ratio of approximately .epsilon.=12, operation takes place with relatively poor mixtures with air/fuel ratios of about .lambda.=1.6 or over in order to reduce NO.sub.x -production. At loads about approximately 70% of the (normally aspirated) nominal power, the oxygen-ratio must be reduced in order to aspirate sufficient fuel for the power demand. NO.sub.x -production would steeply rise, but according to the invention exhaust gas (EGR) is recirculated at least up to nominal load, in order to maintain complete combustion at .lambda.=1.0 and meanwhile keep NO.sub.x -production low. A .lambda.-sensor in the exhaust gases may be used for that purpose. A new venturi-based mixing device for the air-fuel-EGR is disclosed, placed upstream of the main throttle valve. The system is also applicable to diesel-gas, and straight diesel engines, with or without pressure charging. Due to the high compression ratio, thermal efficiency remains high.
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Seppen Jan J.
van der Weide Jouke
Nederlandse Centrale Organisatie Voor Toegepast-Natuurwetenschap
Wolfe, Jr. Willis R.
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