Ngk Spark Plug Company, Limited

Toyohiro Tsukahara

Masao Tsuzuki

A gas sensor apparatus including a gas sensor () which outputs an output value corresponding to the concentration of a specific gas component, and a computation section () which calculates a specific component concentration based on the output value output and a pressure value representing the pressure of the gas. The computation section () includes pressure change rate calculation means (), pressure change rate judgment means (), correction amount calculation means (), and output correction means (). Also disclosed is a concentration measurement method using the gas sensor.

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Ichinomiya, Japan

Toyohiro Tsukahara