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Combustion Improvement and Exhaust Emissions_Characteristics in a Direct Injection Natural Gas Engine by Throttling and Exhaust Gas Recirculation
Technical Paper
2001-01-0737
ISSN: 0148-7191, e-ISSN: 2688-3627
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Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
A natural gas direct injection test engine equipped with a newly developed natural gas injector was built. High total hydrocarbon (THC) emission at part-load and high NOx emission at high-load remain as problems for direct injection natural gas engines. THC reduction and combustion improvement by throttling and NOx reduction by EGR were investigated. The following results were obtained: (1) the combustion at light and medium load conditions is improved by throttling. It is possible to improve the thermal efficiency at light-load in spite of the pumping loss by throttling. THC emissions are greatly decreased in this condition; (2) a large NOx reduction can be obtained without combustion deterioration by appropriate EGR at high-load conditions; and (3) it is possible to decrease both THC and NOx emissions by both throttling and EGR at part-load conditions.
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Citation
Goto, Y. and Sato, Y., "Combustion Improvement and Exhaust Emissions_Characteristics in a Direct Injection Natural Gas Engine by Throttling and Exhaust Gas Recirculation," SAE Technical Paper 2001-01-0737, 2001, https://doi.org/10.4271/2001-01-0737.Also In
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