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    • 8. 发明申请
    • DIAGNOSTIC SYSTEM AND DIAGNOSTIC METHOD FOR INTERNAL COMBUSTION ENGINE
    • 内燃机诊断系统及诊断方法
    • US20150167575A1
    • 2015-06-18
    • US14404396
    • 2013-07-22
    • Takashi Matsumoto
    • Takashi Matsumoto
    • F02D41/26
    • F02D41/26F02D41/1495F02D41/221F02D41/3094F02D2041/224F02D2200/1015
    • A diagnostic system for an engine includes: a plurality of cylinders, in-cylinder injectors, port injectors and an electronic control unit. The electronic control unit configured to make an abnormality diagnosis of an air-fuel ratio due to the in-cylinder injectors and then to make an abnormality diagnosis of the air-fuel ratio due to the port injectors. The electronic control unit is configured to make an abnormality diagnosis of the air-fuel ratio due to the in-cylinder injectors in an operating situation in which fuel is injected from only the in-cylinder injectors, and to make an abnormality diagnosis of the air-fuel ratio due to the port injectors by increasing a ratio of an injection amount of the port injectors when the electronic control unit has diagnosed that there is an abnormality of the air-fuel ratio in an operating situation in which fuel is injected from both the in-cylinder injectors and the port injectors.
    • 一种用于发动机的诊断系统包括:多个气缸,缸内喷射器,喷射器和电子控制单元。 该电子控制单元被配置为对由缸内喷射器引起的空燃比进行异常诊断,然后对由于喷射口引起的空燃比进行异常诊断。 电子控制单元构成为在仅从缸内喷射器喷射燃料的运转状态下对由缸内喷射器引起的空燃比进行异常诊断,对空气进行异常诊断 - 当电子控制单元已经诊断出在从两个喷射器喷射燃料的操作情况下存在空燃比的异常时,通过增加端口喷射器的喷射量的比例来增加端口喷射器的燃料比 缸内喷油器和喷油嘴。