| 摘要 |
PURPOSE:To simplify the constitution of a heating-wire type intake air amount sensor by controlling a sensor power source on the basis of the signal of the air amount sensor and controlling a fuel injection valve. CONSTITUTION:The output analogue signal DELTAV of a heating-wire type intake air amount sensor 11 is amplified by an amplifier 19 and put into digital conversion by an A/D converter 20. Said signal is supplied into a resistor 22, and a pulse width signal is obtained by comparing this signal of a counter 24 which counts the signal of an oscillation circuit 25 with the signal of the above-described resistor 22. The power source of the heating-wire type intake air amount sensor is controlled by controlling a power transistor 26 by said pulse width signal. Further, fuel injection valve control is performed by said pulse width signal. Thus, the constitution of the heating-wire type intake air amount sensor can be simplified. |
