Oxygen sensors are standard on cars and use the Nernst principle. It uses ceramic sensitive components to measure the oxygen potential in automotive exhaust ducts, calculates the corresponding oxygen concentration from the principle of chemical equilibrium, and achieves the monitoring and control of combustion air-fuel ratio to ensure product quality and exhaust gas emission standards. It has the advantages of simple structure, rapid response, easy maintenance, easy use and accurate measurement.
Oxygen sensors are an essential element in engines that use three-way catalytic converters to reduce exhaust pollution. As the air-fuel ratio of the mixture deviates from the stoichiometric air-fuel ratio, the three-way catalyst's ability to purify CO, HC, and NOx will drop drastically. Therefore, an oxygen sensor is installed in the exhaust pipe to detect the concentration of oxygen in the exhaust gas. The ECU sends a feedback signal, and then the ECU controls the increase or decrease of the fuel injection quantity of the injector, so that the air-fuel ratio of the mixture is controlled in the vicinity of the theoretical value.