Oxygen sensor is one of the necessary sensors on the car, its main role is to make the engine to get the best concentration of the mixture, so as to achieve the reduction of harmful gas emissions and fuel conservation purposes. The oxygen sensor is used to determine whether the oxygen in the exhaust gas after combustion of the engine is excessive and the oxygen content is converted into a voltage signal Sensor to the engine computer so that the engine can achieve closed-loop control with an excess air factor; ensuring that the three-way catalytic converter The pollutants in the exhaust, carbon monoxide and nitrogen oxides have three kinds of pollutants have the greatest conversion efficiency, the maximum degree of emissions of pollutants conversion and purification.

The automotive oxygen sensor is used to detect the exhaust gas state into the ternary catalytic converter, which is an indispensable sensor on the engine using a three-way catalytic converter. Once the air-fuel ratio of the engine deviates from the theoretical air-fuel ratio, the purifying capacity of the ternary catalyst for CO, HC and NOx will drop sharply. It is necessary Fuel Rail Pressure Sensor to control the air-fuel ratio of the mixed gas to a narrow range near the stoichiometric air-fuel ratio in order to achieve optimum exhaust gas purifying performance for an engine equipped with a three-way catalytic converter. At present, the oxygen sensor used in the car has two kinds of zirconia and titanium oxide.

In the car, the oxygen sensor at any time to detect the oxygen concentration in the exhaust, and at any time to the computer control device feedback signal. Microcomputer is based on the feedback signal to adjust the fuel injection in time, such as the signal reflects the thicker mixture, then reduce the fuel injection time; the other hand, if the signal reflects the thin, then extend Temperature Sensor the fuel injection time. So that the air-fuel ratio of the mixture is always maintained at the theoretical air-fuel ratio which is always maintained near the theoretical air-fuel ratio. This is the fuel closed-loop control or fuel feedback control.