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At the 11th Greater Bay Area International New Energy Vehicle Technology and Supply Chain Exhibition (NEAS CHINA 2023), which just concluded last week, "National 6b" commercial vehicles and related accessories became a major focus. Matching this, the commercial vehicle market has swept away the haze this year, achieving a "9 consecutive increases" since February, using sales data to express the good news of the market's continuous recovery.

Policy background: The emission standards for commercial vehicles have been raised again

In May this year, the Ministry of Ecology and Environment, the Ministry of Industry and Information Technology, and other five departments jointly issued a notice on the implementation of the National VI emission standards for automobiles. Starting from July 1st, the national level will fully implement the 6b stage of the National VI emission standards, and prohibit the production, import, and sale of vehicles that do not meet the 6b stage of the National VI emission standards.

From market data, although the "National 6b" emission standards are strict, they have not dampened market confidence, mainly due to the mature pollutant emission limits and measurement methods in the industry.

SCR system: core system for exhaust emission post-treatment

According to the requirements of the "National 6b" standard, commercial vehicles need to adopt a "driver alarm system" and a "driving performance restriction system" to monitor exhaust emissions in real time, to ensure that the processing system works properly and the exhaust meets emission standards. If the diesel engine exhaust treatment fluid is not loaded, or the purity is insufficient, or the quality is poor, the system will directly upload the problem to the relevant regulatory department and inform the driver to repair it as soon as possible. The vehicle engine will be limited in torque and speed. In addition, low-quality diesel exhaust treatment fluid can contaminate the catalyst in the SCR catalytic unit, causing serious consequences. Therefore, a reliable in vehicle exhaust purification system sensor is an essential sensing component for the SCR system.

Sensors for in vehicle exhaust purification systems: essential sensing components for commercial vehicle SCR systems

According to the requirements of the "National 6b" standard, commercial vehicles need to adopt a "driver alarm system" and a "driving performance restriction system" to monitor exhaust emissions in real time, to ensure that the processing system works properly and the exhaust meets emission standards. If the diesel engine exhaust treatment fluid is not loaded, or the purity is insufficient, or the quality is poor, the system will directly upload the problem to the relevant regulatory department and inform the driver to repair it as soon as possible. The vehicle engine will be limited in torque and speed. In addition, low-quality diesel exhaust treatment fluid can contaminate the catalyst in the SCR catalytic unit, causing serious consequences. Therefore, a reliable in vehicle exhaust purification system sensor is an essential sensing component for the SCR system.

To this end, Audi Wei has launched a vehicle exhaust purification system sensor specifically designed for SCR system urea detection. This product, combined with matching circuits, can monitor the quality of vehicle urea in real time, with high reliability and good consistency. At present, ultrasonic measurement is the mainstream technical solution for detecting urea quality in the market.