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Particulate Matter Emissions from a Direct Injection Spark Ignition Engine under Cold Fast Idle Conditions for Ethanol-Gasoline Blends

机译:乙醇 - 汽油混合物在冷快速怠速条件下直接喷射火花点火发动机的颗粒物排放

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摘要

The engine out particular matter number (PN) distributions at engine coolant temperature (ECT) of 0° C to 40° C for ethanol/ gasoline blends (E0 to E85) have been measured for a direct-injection spark ignition engine under cold fast idle condition. For E10 to E85, PN increases modestly when the ECT is lowered. The distributions, however, are insensitive to the ethanol content of the fuel. The PN for E0 is substantially higher than the gasohol fuels at ECT below 20° C. The total PN values (obtained from integrating the PN distribution from 15 to 350 run) are approximately the same for all fuels (E0 to E85) when ECT is above 20° C. When ECT is decreased below 20° C, the total PN values for E10 to E85 increase modestly, and they are insensitive to the ethanol content. For E0, however, the total PN increases substantially. This sharp change in PN from E0 to E10 is confirmed by running the tests with E2.5 and E5. The midpoint of the transition occurs at approximately E5. Because the fuel evaporative property does not change substantially from E0 to E10, the significant change in PN is attributed to the particulate matter formation chemistry.
机译:对于直喷式火花点火发动机,在冷快速怠速下,对于乙醇/汽油混合物(E0至E85),在发动机冷却液温度(ECT)为0°C至40°C的情况下,测量了发动机输出的特殊物质数量(PN)分布。健康)状况。对于E10至E85,当ECT降低时,PN会适度增加。然而,该分布对燃料的乙醇含量不敏感。 E0的PN显着高于ECT低于20°C时的汽油燃料。当ECT为ET时,所有燃料(E0到E85)的总PN值(通过对15至350运转的PN分布求积分而获得)大致相同。高于20°C。当ECT降至20°C以下时,E10至E85的总PN值将适度增加,并且它们对乙醇含量不敏感。但是,对于E0,总PN显着增加。从E0到E10的PN急剧变化可以通过使用E2.5和E5进行测试来确认。过渡的中点发生在大约E5。由于燃料的蒸发性能从E0到E10基本上没有变化,因此PN的显着变化归因于颗粒物形成化学。

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