| 摘要 |
PURPOSE:To increase control stability of injection at low loaded time, when a pulse width of the basic pulse, calculated in accordance with an operational condition, is smaller than a prescribed width, by decreasing a number of injection times for an engine cycle as compared with a case when the above described pulse width is larger than the 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 content of a flag register, with which of an upper limit value or lower limit value the Tp shall be compared is decided, in accordance with the decision result, a pulse width of the Tp is changed. That is, injection is controlled in such a manner that fuel is injected once a half cycle of an engine when a pulse width of the Tp is larger than a prescribed width while the fuel is injected once a cycle of the engine 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 fuel excess correction. |
