Effect of Ignition Timing on Performance of High Compression and Ignition Methanol Engine
Author(s): CHEN Li-li, HONG Wei, LI Xiao-ping, SU Yan, XIE Fang-xi, HAN Lin-pei
Pages: 60-63
Year: 2014 Issue: 4
Journal: Vehicle Engine
Keyword: methanol engine; ignition timing; combustion; emission;
Abstract: On a retrofitted methanol engine with 17 .5 compression ratio ,intake throttle ,intake port injection and spark igni-tion ,the influences of ignition timing on combustion and emission characteristics in 1 400 r/min were investigated .The results show that the methanol engine can run stably at the ignition advance angle of 18°BTDC ,15°BTDC and 12°BTDC .However , the maximum ignition timing delays with the load increase due to the limit of engine knock .With the increase of load ,the igni-tion delay period shortens and the maximum in-cylinder pressure and heat release rate increase obviously .With the advance of ignition timing ,the combustion process advances ,the maximum in-cylinder pressure and heat release rate increase ,and the combustion duration decreases .Therefore ,the optimized ignition timing can bring about a good compromise of economy and emission especially in low and medium load .
Pages: 60-63
Year: 2014 Issue: 4
Journal: Vehicle Engine
Keyword: methanol engine; ignition timing; combustion; emission;
Abstract: On a retrofitted methanol engine with 17 .5 compression ratio ,intake throttle ,intake port injection and spark igni-tion ,the influences of ignition timing on combustion and emission characteristics in 1 400 r/min were investigated .The results show that the methanol engine can run stably at the ignition advance angle of 18°BTDC ,15°BTDC and 12°BTDC .However , the maximum ignition timing delays with the load increase due to the limit of engine knock .With the increase of load ,the igni-tion delay period shortens and the maximum in-cylinder pressure and heat release rate increase obviously .With the advance of ignition timing ,the combustion process advances ,the maximum in-cylinder pressure and heat release rate increase ,and the combustion duration decreases .Therefore ,the optimized ignition timing can bring about a good compromise of economy and emission especially in low and medium load .
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