초록 ▼

In a spark-ignited gas engine with relatively high compression ratio of approximately elx-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. NOx-production would steeply r

In a spark-ignited gas engine with relatively high compression ratio of approximately elx-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. NOx-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 lx-production low. A l

대표청구항 ▼

An internal combustion engine system which uses a gaseous fuel, which mixed with air, is ignited in the combustion chamber of the engine and burnt to deliver power and which is designed for low levels of nitrogen oxides (NOx) emissions in the exhaust even with mixtures of air/fuel ratios normally ch

An internal combustion engine system which uses a gaseous fuel, which mixed with air, is ignited in the combustion chamber of the engine and burnt to deliver power and which is designed for low levels of nitrogen oxides (NOx) emissions in the exhaust even with mixtures of air/fuel ratios normally characterized by high level of emissions and with relatively high compression ratios for high thermodynamic efficiency at least over the full load portion of the power range comprising: an internal combustion engine including a main throttle valve; a fuel/air mixing means located upstream of the main throttle valve including a fuel gas inlet and an exhaust gas inlet; and means for supplying recirculated exhaust gas relatively free of oxygen to said exhaust gas inlet such that the same full load power output the engine can deliver without exhaust gas recirculation is achieveable with a low level of nitrogen oxides emissions.