The role of automobile oxygen sensor

1.It is the information to determine whether there is excess oxygen in the exhaust of the engine after combustion, namely the oxygen content and convert the oxygen content into voltage signal to transmit to the engine computer, so that the engine can achieve the closed-loop control with the excessive air factor (A=1) as the target; To ensure that the three-effect catalytic converter of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOX) in the exhaust of three pollutants have the maximum conversion efficiency, the maximum extent of pollutant emission conversion and net automotive oxygen sensor used to detect the exhaust gas state into the three-way catalytic conversion device, is the use of three-way catalytic conversion device engine must not Can be less sensor.

2.Once the air-fuel ratio of the engine deviates from the theoretical air-fuel ratio, the purification capacity of the three-component catalyst for CO, HC and NOx will decrease sharply. Therefore, in order to achieve the best exhaust purification performance of the engine equipped with the ternary catalytic conversion device, the air-fuel ratio of the mixture must be controlled within a very narrow range around the theoretical air-fuel ratio. At present, there are two kinds of oxygen sensors in the automobile, zirconia type and titanium oxide type.