| 摘要 |
<p>PURPOSE:To simplify a wiring circuit by performing the electronic control of an internal combustion engine on the basis of a measured air quantity, by providing a thermal air flow quantity measuring apparatus in an air sucking pipe and intermittently controlling a heating current to a temp.-sensitive element by the synchronous signal of the rotation of an engine. CONSTITUTION:Air is sucked from an air filter 12 and the flow quantity thereof is measured by the air flow quantity measuring apparatus 17 provided in an air sucking pipe 13 while the measured value is inputted to an engine control unit 18. This air flow quantity measuring apparatus 17 is constituted by winding a temp.-sensitive element 172 having a temp. characteristic around a ceramic bobbin 171 and a resistance value is measured by flowing a heating current to said element 172. The control unit 18 issues a control signal to the rotary speed detection system 19 and the fuel system 23 of an engine 1 and the synchronous signal of the engine rotation is inputted to the circuit of the temp.-sensitive element 172 from the control unit 18 to intermittently apply the heating current in a pulsating state. Then, the signal of the measured air quantity is sent to the control unit 18 and an air/fuel ratio is operated to properly perform electronic control. Therefore, because the synchronous signal is applied from the outside, the wiring circuit for the synchronous signal is simplified.</p> |
