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    • 7. 发明申请
    • SPARK-IGNITION ENGINE CONTROL METHOD AND SYSTEM
    • 火花点火发动机控制方法与系统
    • US20110239986A1
    • 2011-10-06
    • US13038156
    • 2011-03-01
    • Kouji SHISHIMENaoya MATSUOMikinori OHASHI
    • Kouji SHISHIMENaoya MATSUOMikinori OHASHI
    • F02P5/04
    • F02D41/401F02B2075/125F02D13/0238F02D13/0269F02D15/00F02D35/021F02D35/027F02D2200/025Y02T10/12Y02T10/123Y02T10/142Y02T10/44
    • When preignition is detected, and an engine speed is less than a predetermined value (Nex), an air/fuel ratio is enriched (S22), and then, when the preignition is detected even after enriching the air/fuel ratio, an effective compression ratio of an engine is reduced (S23), whereafter, when the preignition is detected even after reducing the effective compression ratio, a part of injection fuel is injected in a compression stroke (S24). On the other hand, when preignition is detected, and an engine speed is equal to or greater than the predetermined value (Nex), the air/fuel ratio is enriched (S31), and then, when the preignition is detected even after enriching the air/fuel ratio, a part of the fuel is injected in the compression stroke (S32). This makes it possible to effectively suppress the occurrence of preignition while maximally avoiding deterioration in emission performance and lowering in engine power output.
    • 当检测到预警,并且发动机转速小于预定值(Nex)时,空气/燃料比被浓缩(S22),然后,即使在浓缩空燃比之后也检测到预警,有效压缩 发动机的比例降低(S23),此后即使在降低有效压缩比之后也检测到预警,在压缩冲程中喷射一部分喷射燃料(S24)。 另一方面,当检测到预警,并且发动机转速等于或大于预定值(Nex)时,空燃比被富集(S31),然后,即使在浓缩之后也检测到预警 空燃比,在压缩冲程中喷射一部分燃料(S32)。 这使得可以有效地抑制预激发的发生,同时最大限度地避免发射性能的劣化和发动机功率输出的降低。