| 摘要 |
<p>PURPOSE:To output a correct signal of sucked air amount by providing a current control means for controlling current flowing through a flow speed measuring resistor and a temperature compensating resistor based on an output signal of a differential amplifier. CONSTITUTION:Since a flow speed measuring resistor 7 and a temperature compensating resistor 8 are so constituted that they are subject to a air flow, there is a phenomenon that high frequency noise due to ignition spark or discharge of a distributor enters from these portions. Therefore, constitution is made so that high frequency noise entering from the resistor 7 is cut by a high cut-off filter consisting of a resistance 16 and a capacitor 24. With respect to high frequency noise entering from the resistor 8, differential components can be cut by a high cut-off filter consisting of a resistance 22 and a capacitor 23 while in-phase components can be cut by the resistance 22 and the capacitor 24. This makes it possible to obtain an accurate signal of sucked air flow rate.</p> |
