Temperature compensation method for gas sensor module using change of heater current

A temperature compensation method for a gas sensor module using a change of heater current, the method comprising:

• a first step of deriving an output voltage equation of the gas sensor module from a cell reaction equation of an electrolyte and expressing the derived output voltage equation as an equation for a fluctuation temperature which varies depending on a sensor temperature and a compensation coefficient;
• a second step of deriving the fluctuation temperature by a heater current indicating a current value of a heater formed in the gas sensor module and re-expressing the output voltage equation expressed in the first step as an equation for the heater current and the compensation coefficient;
• and
• a third step of measuring an output voltage depending on current of heaters at two or more points to determine the compensation coefficient of the output voltage equation re-expressed in the second step,
• wherein the output voltage measured in the third step is compensated with the change of the heater current measured by the gas sensor module regardless of an external temperature.