Combustion, Performance and Emission Characteristics of Ethanolfueled Engine with Diesel Micropilot Injection Ignition

CHEN Zhenhao1; LI Tie1; 2; WANG Bin1; 2; GAO Tongyang3; ZHENG Ming3

doi:10.3969/j.issn.1001-2222.2017.06.002

Vehicle Engine ›› 2017, Vol. 0 ›› Issue (6) : 7-12. DOI: 10.3969/j.issn.1001-2222.2017.06.002

Combustion, Performance and Emission Characteristics of Ethanolfueled Engine with Diesel Micropilot Injection Ignition

CHEN Zhenhao¹,LI Tie^1,2,WANG Bin^1,2,GAO Tongyang³,ZHENG Ming³

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Abstract

Ethanolfueled engine with diesel micro-pilot injection ignition adopted the fuel supply method of ethanol port injection and diesel in-cylinder direct injection. On a singlecylinder fourstroke compression ignition engine, the combustion, performance and emission characteristics were researched. With the pilot diesel amount fixed as the minimum value to realize compressionignition, pilot diesel injection timing sweeping tests were conducted based on different ethanol injection mass under intake air pressure of 0.15 MPa. Pilot diesel injection timing had a strong effect on combustion, performance and emission. The engine could work steadily at medium and high load and its thermal efficiency was more than 33%. With the appropriate pilot diesel injection timing, unburnt hydrocarbon, carbon monoxide and nitrogen oxide emission decreased and the ultralow soot emission realized. In addition, engine combustion form of premixed combustion or partialpremixed combustion led to 2-stage heat release characteristic and so combustion phase could be controlled effectively by changing pilot diesel injection timing.