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nox sensor，what does a nox sensor do，joinwin technology news

nox sensor，what does a nox sensor do，joinwin technology news

July 28 , 2023 0

The NOX sensor is used to measure the concentration of nitrogen and oxygen in the engine exhaust gas to meet the demand for closed-loop control of the engine aftertreatment system and the needs of the on-board OBD diagnostic system. There are two NOX sensors in the diesel six aftertreatment system, using the inlet/outlet two NOX sensors programme, which can calculate the nitrogen oxides conversion efficiency in real time, and control the engine nitrogen oxides original emissions. The use of more accurate closed-loop control logic can improve fuel economy.

NOx Sensor Principle

A NOx sensor is a sensor that detects the concentration of nitrogen oxides (NOx) in a vehicle's exhaust gases. It is an important part of modern vehicle emission control systems, helping vehicles to meet stringent emission standards.

The principle of the NOx sensor is based on an electrochemical reaction. When NOx enters the sensor, it reacts with electrodes in the sensor to produce an electric current. The size of this current is proportional to the concentration of NOx. Therefore, by measuring the

current, the concentration of NOx can be determined.

NOx sensors usually consist of two electrodes: a reference electrode and a working electrode. The reference electrode is usually a platinum electrode, which is used to provide a stable potential so that changes in potential at the working electrode can be measured.

The working electrode is usually made of oxide paving, and its function is to react with NOx to produce an electric current.

The principle of operation of a NOx sensor can be divided into two stages. In the first stage, the sensor is in "oxygen-enriched" mode. This means that the concentration of oxygen in the sensor is very high, so the oxide layer on the working electrode is oxidised to

Ce4+. In this case, the output current of the sensor is very low.

In the second phase, the sensor is in "oxygen-poor" mode. This means that the oxygen concentration in the sensor is very low, so the oxide layer on the working electrode is reduced to Ce3+. In this case, the output current of the sensor is high.

Front NOX sensor:

Detects the NOX concentration and oxygen concentration in the engine's original exhaust gas and transmits the corresponding signals to the ECU for calculating and controlling the urea injection volume and DPF regeneration;

Rear NOX sensor:

Used for OBD monitoring, mainly detects NOX concentration in the exhaust gas, and at the same time calculates the conversion efficiency by combining with the front NOx sensor, and the conversion efficiency of the National Six model can reach more than 95%, so as

to realise the closed-loop control of urea injection.

The nox sensor failure is handled as follows:

1, nox sensor failure if it is caused by the sensor line or the loosening of the plug, you can check whether the connection of the plug harness is intact;

2, the cause of the failure may be the sensor probe is damaged or stained, if it is the cause of the stain, remove the stain after reinstallation can be, if the device is damaged you need to replace the device to solve the problem;

3, if the nox sensor itself connector damage occurs, the damaged sensor can be replaced after the return to normal.

Nox sensors are divided into optical, electrochemical and other principles of the nox sensor, it can only be used to measure the value of the export nox. nox sensors are used in the automotive testing industry, is the exhaust gas