某GDI发动机早燃超级爆震控制策略试验研究
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摘要
发动机爆震信号可用于监测发动机普通爆震情况,而通过滤波和窗口调整处理的爆震信号可用于对早燃超级爆震情况进行判断。缸内压力传感器可用于对爆震信号进行标定,采用标定后的爆震信号监测发动机早燃超级爆震,研究喷油和气门正时策略对早燃超级爆震的影响。研究结果表明,喷油策略对早燃超级爆震和碳烟颗粒排放物的影响规律基本相同。扫气在降低残余废气的同时,可降低早燃超级爆震倾向。在一定范围内,提前第1次喷油时刻,推迟第2次喷油时刻,并适当降低第2次喷油比例,可改善燃油雾化,减少燃油撞壁,同时可利用燃油蒸发吸热降低缸内温度,提高进气充量,减少早燃超级爆震。进气门提前开启,排气门适当滞后关闭,增加扫气效果,并适当加浓混合气,早燃超级爆震敏感性降低。采用爆震传感器监测早燃超级爆震,优化后的策略能在催化器温度不超温的前提下显著降低发动机早燃超级爆震。
The signal of knock sensor can be used to monitor the normal knock of the engine. In some ways filtering and window adjustment of the knock sensor signal can also be used to monitor the pre-ignition and super knock. The signal of knock sensor can be calibrated by using cylinder pressure sensor that can monitor the pre-ignition and super knock. This method can be used to study the effects of injection timing and valve timing strategy on pre-ignition and super knock. The results show that the injection timing strategy has the same effect on the super knock and soot emissions. At the same time, scavenging can reduce the residual gas and reduce the tendency of super knock. Within a certain range, advancing the first and retarding the second injection timing meanwhile reducing the secondary injection ratio can improve fuel air mixing and reduce wall wetted. On the other hand, it can reduce the temperature in the cylinder by means of fuel evaporation and increase the air charge, finally reduce the super knock. The strategies that the intake valve is opened early, that the exhaust valve is closed appropriately in retard,that the scavenging effect is increased, and that the mixed gas is proper enriched, make the sensitivity of super knock decreases. By using knock sensor to monitor the abnormal combustion, the optimized strategy can significantly improve the engine's pre-ignition without exceeding the catalytic temperature.
The signal of knock sensor can be used to monitor the normal knock of the engine. In some ways filtering and window adjustment of the knock sensor signal can also be used to monitor the pre-ignition and super knock. The signal of knock sensor can be calibrated by using cylinder pressure sensor that can monitor the pre-ignition and super knock. This method can be used to study the effects of injection timing and valve timing strategy on pre-ignition and super knock. The results show that the injection timing strategy has the same effect on the super knock and soot emissions. At the same time, scavenging can reduce the residual gas and reduce the tendency of super knock. Within a certain range, advancing the first and retarding the second injection timing meanwhile reducing the secondary injection ratio can improve fuel air mixing and reduce wall wetted. On the other hand, it can reduce the temperature in the cylinder by means of fuel evaporation and increase the air charge, finally reduce the super knock. The strategies that the intake valve is opened early, that the exhaust valve is closed appropriately in retard,that the scavenging effect is increased, and that the mixed gas is proper enriched, make the sensitivity of super knock decreases. By using knock sensor to monitor the abnormal combustion, the optimized strategy can significantly improve the engine's pre-ignition without exceeding the catalytic temperature.
引文
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6 Kunde O.,Hansen J.,Zenner T.,et al.The new 2.0 SCTi Ecoboost gasoline engine from Ford[C].Germany:The 19th Aachener Kolloquium Fahrzeug-und Motorentechnik,2010
7 Dingle S.F.,Cairns A.,Zhao H.,et al.Lubricant induced preignition in an optical SI engine[C].SAE Paper 2014-01-1222
8乔佳伟,王义夫,王继波,等.增压直喷汽油发动机早燃现象改善的研究[J].小型内燃机和车辆技术,2014,43(6):44-47
9李元平,平银生,尹琪.增压缸内直喷汽油机早燃及超级爆震试验研究[J].内燃机工程,2012,33(5):63-66
2白云龙,马为,张小燕,等.增压直喷汽油机喷油策略对低速早燃的影响研究[J].内燃机工程,2015,36(4):62-65+70
3王志,龙岩,王建昕.增压汽油机中早燃和超级爆震的研究进展[J].汽车安全与节能学报,2015,6(1):17-29
4 Dahnz C.,Han K.M.,Spicher U.,et al.Investigations on preignition in highly supercharged SI engines[C].SAE Paper2010-01-0355
5 Zaccardi J.,EscudiéD.Overview of the main mechanisms triggering low-speed pre-ignition in spark-ignition engines[J].International Journal of Engine Research,2014,16(2):152-165
6 Kunde O.,Hansen J.,Zenner T.,et al.The new 2.0 SCTi Ecoboost gasoline engine from Ford[C].Germany:The 19th Aachener Kolloquium Fahrzeug-und Motorentechnik,2010
7 Dingle S.F.,Cairns A.,Zhao H.,et al.Lubricant induced preignition in an optical SI engine[C].SAE Paper 2014-01-1222
8乔佳伟,王义夫,王继波,等.增压直喷汽油发动机早燃现象改善的研究[J].小型内燃机和车辆技术,2014,43(6):44-47
9李元平,平银生,尹琪.增压缸内直喷汽油机早燃及超级爆震试验研究[J].内燃机工程,2012,33(5):63-66