What role does the oxygen sensor play in the car?

by:DEFUS     2020-05-26

With the wide application of electronic control technology in automobiles, oxygen sensors are widely used in engine control systems. Oxygen sensors are very important for the combustion conditions of automobile engines. Oxygen sensors are installed on engine exhaust pipes. It is a key feedback sensor in the EFI engine control system. It controls the automobile exhaust emissions, reduces the car's pollution to the environment, and improves the engine's combustion quality. Oxygen sensors are available in zirconium dioxide and titanium dioxide. The zirconium dioxide oxygen sensor uses the change in voltage to reflect the combustible gas concentration. The titanium dioxide oxygen sensor reflects the change of combustible gas mixture through the change of resistance. We all know that the theoretical air-fuel ratio of the engine is 14.7: 1, and the oxygen sensor is a feedback control system that uses an electronically controlled fuel injection device to detect the oxygen concentration in the exhaust gas and the air-fuel ratio, and send a feedback signal to the computer. The zirconium dioxide oxygen sensor reflects the change of the combustible gas concentration through voltage changes. When the engine operating conditions deteriorate, the electronic control system using the zirconium dioxide oxygen sensor cannot control the actual air-fuel ratio near the theoretical air-fuel ratio. The titanium dioxide oxygen sensor reflects the change of the combustible gas mixture through the change of resistance, and it is possible to control the actual air-fuel north near the theoretical air-fuel ratio. Working principle: The surface of the zirconium dioxide oxygen sensor is coated with a layer of platinum. Under high temperature and platinum catalysis, the oxygen concentration difference between the inside and outside of the zirconium oxide is used to generate a potential difference. The greater the concentration difference, the greater the potential difference. Due to the high temperature and platinum catalysis, the oxygen attached to the oxygen sensor is exhausted, and a voltage difference is generated. According to the voltage signal of the oxygen sensor, the air-fuel ratio is controlled to adjust the fuel injection pulse width. The key sensor.                                

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