| 摘要 |
PURPOSE:To make a steady starting of an engine possible at all times without influenced by secular change of the engine or environmental condition by correcting fuel injection quantity at the starting by the learning correction coefficient learned from normal operation including the secular change of the engine and environmental condition. CONSTITUTION:An air-fuel ratio control sytem of an engine comprising a microcomputer calculates a basic injection quantity Tp from an intake air quantity Q and a rotational speed N of the engine; establishes an air-fuel ratio feedback correction coefficient alpha from an O2 sensor output; retrieves a learning correction coefficient alphaL stored in a RAM from the operational requirements of the engine, that is, the rotational speed N and Tp; calculates the injection quantity Ti; and updates the data of alphaL. When the starting of the engine is detected, a basic injection quantity at the starting is set up on the basis of the cooling water temperature, and an injection quantity Tcs is calculated by multiplying the basic injection quantity obtained above with a lerning correction coefficient for the operating condition at this time, and is set to the driving pulse signal means in place of Ti. By this control, the engine can always make a steady starting without influenced by the secular change of the engine and environmental conditions. |
