Oxygen sensor works

Fast development of the automotive industry , automotive replacement is getting faster and faster , increasing the level of automobile manufacturing technology , more and more precision machining parts for automotive emissions requirements become more stringent , the Camshaft Position Sensor in the middle of vulnerable the impact of fuel combustion , the fuel quality requirements are also increasing. Oxygen sensors are used in automotive engine management system, by detecting the oxygen content in the exhaust gas , the probe results in the form of feedback signals to the engine management system, the detection results and the exhaust gas oxygen content was one relationship , the engine management system according to the feedback signal after calculation , analysis and judgment to issue directives to the actuator to complete a variety of actions , so that the engine can be in a variety of working conditions in order to work optimally . Sensor works: oxygen sensor sensitive components using its ceramic zirconia ceramic materials at high temperatures characteristic of oxygen pump oxygen sensing signal . Zirconia ceramic at a temperature and oxygen ions may be turned on , when the oxygen concentration on both sides there is a difference , will be based on the Nernst equation potential difference is generated . Air-fuel ratio when the engine is operating in the vicinity of λ = 1 (typically λ = 0.99-1.01), zirconium oxide ceramic will exhibit a significant change in the electric potential difference , therefore , the Engine Temp Sensorof this step- by sensing the change in the electric potential of the work of the engine the feedback control , which enters the engine when the oxygen-depleted or enriched provide basic response signal , indicating the engine air-fuel ratio control system will be adjusted to standard conditions . Cars generally need to install two oxygen sensors , catalytic systems were installed in the front and rear . Catalytic system is attached to the tip of the oxygen sensor for detecting oxygen concentration in exhaust gas , according to the level of oxygen concentration in the exhaust gas back to the gasoline engine , the gasoline engine according to Coolant Temperature Sensor feedback signal increases or decreases the air-fuel ratio , so that air-fuel ratio always in perfect combustion state λ = 1 nearby. Catalytic exhaust system of harmful gases such as CO, CH and NOx , etc. into harmless carbon dioxide, water and nitrogen , and finally confirmed through an exhaust gas oxygen sensor has been transformed completely .