Patent ID: 6752014
Filing Date: 2004-06-22
Classification: G01F

Abstract:
A hot-wire type air flow meter for an internal combustion engine, comprising:an exothermic resistor film provided on a thin portion formed on a silicon substrate arranged in a suction pipe of the internal combustion engine and emits heat to an air through said resistor film; and a control circuit for controlling a voltage to be applied to said resistor film or a current to be supplied, said control circuit being configured such that, where a liquid droplet is deposited onto said resistor film, said applied voltage is controlled to a value smaller than a voltage which is applied to said resistor film at the time of measuring a maximum measuring of an air flow rate within said suction pipe when a liquid droplet is not deposited onto said resistor film range or said supply current is controlled to a value smaller than a current flowing in said resistor film at the time of measuring the maximum measuring range.