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NOx sensor

PM sensor

Wide-range oxygen sensor

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Product Series

Danrui Technology has long been committed to the field of new materials. Through years of R&D, the company has incubated a series of electrochemical sensors, including NOx sensors, intelligent wide-range oxygen sensors, and PM sensors. With a deep foundation in ceramic materials research and robust product development capabilities, Danrui has been supplying NOx sensors in large volumes to OEMs for six years, with cumulative deliveries totaling 600,000 units to Yuchai. It is currently the only domestic supplier of NOx sensors with proven experience in volume supply to major automakers. The company is now collaborating with FAW Jiefang and Cummins on validation trials, while its products are also exported to markets in Europe and North America.

NOx sensor

NOx sensor

The NOx sensor is used to measure nitrogen oxides. By monitoring the NOx concentration in the exhaust, the ECU controls the urea injection rate of the SCR system, thereby reducing NOx emissions to meet the relevant national emission standards. The sensor’s ceramic chip is made of YSZ, which exhibits excellent electrolyte properties at high temperatures. By precisely controlling oxygen pumping between the internal chambers of the ceramic chip, the sensor accurately measures the NOx concentration in the exhaust. NOx sensors are primarily used in passenger and commercial vehicles equipped with diesel engines.

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PM sensor

PM sensor

The exhaust particulate sensor is installed downstream of the diesel particulate filter in the exhaust pipe and operates on a resistance-measurement principle. When particulates from the exhaust adhere between the two electrodes, a conductive circuit is formed, generating an electric current. By measuring this current, the sensor provides feedback on the DPF’s particulate loading, and the sensing element is regenerated through heating.

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Wide-range oxygen sensor

Wide-range oxygen sensor

The wide-range oxygen sensor measures the oxygen concentration in engine exhaust by detecting the current generated by the migration of oxygen ions within the zirconia oxygen-pumping unit, enabling the ECU to precisely control fuel injection timing and thereby enhancing engine control accuracy.

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