| 摘要 |
PURPOSE:To enable the fuel injection quantity to be controlled properly in response to the temperature change in a fuel system without the need of a temperature sensor by detecting the rise time of electric signals varying with said temperature change, and then, correcting the fuel injection quantity to increase and decrease by means of the detection signals resulting from the above detection. CONSTITUTION:In a processing unit 6 within a control circuit 4, the fuel injection time is computed from signals indicating various operating conditions, and according to the result of said computing, a transistor 8 is set to ON so that fuel in such a quantity as corresponding to said fuel injection time is injected through an injection valve 2. And, in this case, a low resistance (shunt resistance) is connected to the emitter E of the transistor 8, and the value of current at the connection is compared with the reference current value by means of a comparator 14. When the temperatures of fuel and the injection valve 2 proper are low, the electric resistance decreases, and the rise time until the current at the point E reaches the reference current value is short; on the other hand, when these temperatures are high, the rise time becomes longer. Therefore, according to said rise time, the fuel injection time is corrected to increase and decrease for controlling the fuel injection quantity.
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