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研究基于一台2.3 L四缸的涡轮增压汽油机,国内的推荐燃油为RON95汽油。由于匹配该发动机的车型要出口伊朗,当地的燃油多为RON85汽油;因此,需要在台架上进行低辛烷值燃料的性能开发试验。试验中需要综合调整点火提前角(Spark advanced Angle,SA)、空燃比(Air Fuel Ratio,AFR)以及最大增压压力确保该发动机在任何工况下正常运行,且不发生爆震现象。结果表明:由于使用燃料的辛烷值降低,点火提前角普遍减小。而点火提前角的降低又会引起排气温度的升高,降低空燃比进行催化器保护。接近外特性工况下,通过降低最大增压压力,牺牲发动机的性能来确保其稳定运行。
The study is based on a 2.3 L four-cylinder turbocharged gasoline engine, the domestic recommended fuel for the RON95 gasoline. Due to the fact that the models matching this engine are to be exported to Iran, the local fuel is mostly RON85 gasoline; therefore, the performance test of low octane fuel needs to be carried out on the bench. In the test, a combination of Spark advanced Angle (SA), Air Fuel Ratio (AFR) and maximum boost pressure is required to ensure that the engine runs normally under any operating conditions without knocking. The results show that the ignition advance angle generally decreases due to the reduced octane number of the fuel used. The ignition timing angle will reduce the exhaust temperature will rise, reduce the air-fuel ratio catalyst protection. Close to the external characteristics of the operating conditions, by reducing the maximum boost pressure, sacrificing the performance of the engine to ensure its stable operation.