The present disclosure provides a system and method for improving fuel economy and reducing emissions. Methods and systems are provided for improving fuel economy and reducing undesired emissions. In one example, a method may include the steps: in response to an engine speed being within a first threshold speed of an engine idle speed during a speed reduction request with engine cylinders unfueled, maintaining the cylinders unfueled, and controlling the engine to a desired stopping position responsive to the engine speed being greater than a second threshold speed lower than the idle speed. In this way, fuel usage and emissions may be reduced and engine restart requests may be conducted at least in part via vehicle inertia.

    本公开提供了“用于改善燃料经济性并减少排放的系统和方法”。提供了用于改善燃料经济性并减少非期望的排放的方法和系统。在一个示例中,一种方法可以包括:响应于在不对发动机气缸加燃料时的减速请求期间发动机转速在发动机怠速的第一阈值转速内,维持不对所述气缸加燃料;以及响应于所述发动机转速大于低于所述怠速的第二阈值转速而将所述发动机控制到期望的停止位置。通过这种方式,可以减少燃料使用和排放,并且可以至少部分地经由车辆惯性来进行发动机重新起动请求。


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    Title :

    SYSTEM AND METHOD FOR IMPROVING FUEL ECONOMY AND REDUCING EMISSIONS


    Additional title:

    用于改善燃料经济性并减少排放的系统和方法



    Publication date :

    2021-08-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F02N STARTING OF COMBUSTION ENGINES , Anlassen von Brennkraftmaschinen



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