| 摘要 |
PURPOSE:To prevent the occurrence of malfunction due to a fluctuation in the battery voltage of an electronic fuel injection control system, by a method wherein, after a voltage is stabilized to a value lower than the lowermost voltage of a battery, a source voltage is boosted to a value required by an analogue digital converter. CONSTITUTION:A control unit 10, computing and controlling a fuel injection amount signal (e) and an ignition timing control signal (f) from various running parameters, incorporates an analogue digital converter 17 adapted to convert an analogue signal, e.g., an intake air amount detecting signal (a), a cooling water temperature detecting signal (b), a battery voltage (v), into a digital signal. A voltage, boosted to 8V by means of a boosting circuit 21 after the voltage of a battery voltage 18 is stabilized to a value, for example, 5V lower than a lowermost voltage by means of a constant voltage circuit 20, is fed as a source voltage to the analogue digital converter 17.
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