System for determining gas concentration used in I.C. engines, has sensor with pump cell for removing or receiving oxygen, sensor cell for determining concentration of specific gas component and monitoring cell

摘要

System for determining a gas concentration comprises a sensor which has a pump cell for removing or receiving oxygen in a gas, a sensor cell for determining the concentration of a specific gas component in the gas and a monitoring cell for determining the oxygen concentration. System for determining a gas concentration comprises a sensor (100), an exhaust gas purification unit arranged in an exhaust gas passage of an I.C. engine, and a gas concentration determining unit. The sensor has a pump cell (110) for removing or receiving oxygen in a gas, a sensor cell (130) for determining the concentration of a specific gas component in the gas, and a monitoring cell (120) for determining the oxygen concentration. During a time period in which the exhaust gas is fed to the sensor, the atmosphere changes from lean to rich. Preferred Features: The gas concentration determining unit produces the obtained acquired value, produces an estimated predicted value or stops a release function during the time period. The sensor further contains a lambda-cell for releasing an electromotive force acting on the concentration of oxygen in the chamber.