Freight car oxygen sensor

There are two main types of failure of automobile oxygen sensor: aging and poisoning of sensor elements. The main reason for the aging of oxygen sensor is that the local surface temperature of sensor element is too high.

The main reasons for this situation are:

When the engine is just started, in order to warm up quickly, it is necessary to supply enough fuel, and the excess fuel in the exhaust gas will produce combustion reaction on the surface of the oxygen sensor. On the one hand, carbon particles will form, which will cause the protection of the oxygen sensor surface to peel off, on the other hand, it will cause the local temperature of the sensor element surface to be too high, which will accelerate the aging of the sensor. Preheating for a period of time after the cold car starts can reduce this kind of injury;

When the mixture is too rich for a long time, the combustion is incomplete, and there are too many unburned pollutants in the exhaust, the oxygen sensor will be poisoned and ineffective. Ensuring the good condition of the engine and the quality of fuel is the main method to avoid sensor poisoning. For example, in a car burning engine oil, the sensor will break down quickly;

Aging and poisoning of oxygen sensors are inevitable. Therefore, it is necessary to replace the oxygen sensor when the car travels for a certain mileage.