| 摘要 |
PURPOSE:To increase stability of control at low loaded time and improve fuel consumption, by changing a number of injection times per one revolution of an engine when a pulse width of the basic pulse, calculated in accordance with an operational condition, is larger and smaller than a prescribed width. CONSTITUTION:At operation, a microcomputer 9 firstly performs arithmetic operation of a basic pulse Tp, corresponding to a basic injection quantity, on the basis of outputs of a rotary pulse generator circuit 1 and intake air quantity measuring unit 3. Then in accordance with a flag register content, which of upper or lower limit value shall be compared with the Tp is decided, and a pulse width of the Tp is changed in accordance with the decision result. That is, control is performed in such a manner that fuel is injected once a half cycle of an engine when the pulse width of the Tp is larger than a prescribed width while fuel is injected once a cycle of the engine in a classified state by a cylinder or cylinder group when the pulse width of the Tp is smaller than the prescribed width. Then the microcomputer 9 correctively calculates an injection pulse on the basis of outputs of a throttle opening sensor 5, water temperature sensor 6, etc. to perform excess fuel correction. |
