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Oxygen Sensor principle

Oxygen sensor principle

When the engine is working, the exhaust gas flows from the outer surface of the sensor, that is, the working surface, and the oxygen molecules are ionized due to the high temperature. Since a small voltage is generated between the two electrodes on the inner and outer surfaces of the zirconium tube, the output voltage of the oxygen sensor is 0.1V during normal operation. Between -0.9V. When the engine burns the rich mixture, the oxygen content in the exhaust gas is less, the oxygen ions in the zirconium tube move faster, and the voltage is about 0.8V-1V; when the lean mixture is burned, the exhaust gas has a certain amount of oxygen molecules to make the zirconium The oxygen movement capacity of the tube is weakened, and only a voltage of 0.1V is generated. which is

Less fuel injection -> air-fuel ratio -> high oxygen content in the exhaust gas -> oxygen sensor produces 0.1V voltage -> ECU control injection volume increase

The fuel injection amount is too large—>the air-fuel ratio is small—>the oxygen content in the exhaust gas is small—>the oxygen sensor generates 0.9V voltage—>the ECU controls the fuel injection amount to decrease #Oxygen Sensor

The oxygen sensor transmits (information feedback) the detected voltage signal to the ECU. The ECU continuously adjusts the injection pulse width according to the signal of the oxygen sensor, and changes the fuel injection amount so that the fuel injection amount is always at an ideal value (14.7:1). Fluctuating nearby to achieve the desired air-fuel ratio


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