Patent ID: 6968283
Filing Date: 2005-11-22
Classification: G01F

Abstract:
1. A gas flow meter for detecting gas flow in an internal combustion engine, comprising a circuit connected to a higher supply voltage configured as an operational amplifier in the gas flow detection circuit and a circuit connected to a lower supply voltage is configured as a regulator that supplies a voltage to a digital adjusting circuit; a gas flow detection circuit for detecting a gas flow passing through a gas passage; the digital adjusting circuit for adjusting an output characteristic of said gas flow meter to a desired output characteristic and outputting a gas flow signal; a noise reduction circuit including an overvoltage protection circuit and supplying to the gas flow detection circuit and the adjusting circuit a voltage whose surges and overvoltages applied to a power supply terminal are reduced; and wherein there are two or more voltage supply paths for supplying different voltages to the gas flow detection circuit and the adjusting circuit through the overvoltage protection circuit.