Heater controller for gas sensor ensuring stability of temperature control

摘要

A heater controller designed to control the thermal energy produced by a heater under feedback control for heating a body of a gas sensor up to a desired activated temperature. The heater controller works to determine a feedback gain such a proportional or an integral gain as a function of a deviation of the temperature of the gas sensor from a target one and change it based on a condition in which the temperature of the gas sensor is changing from the target value. This ensures the stability of control of the temperature of the gas sensor regardless of a disturbance such as a change in ambient temperature and keeps the accuracy of gas measurement at a higher level.