Overview
Cars play an increasingly important role in people's daily lives, and environmental pollution problems are followed. Diesel engine combustion is a high temperature and oxygen-rich environment. This environment is very likely to lead to an increase in NOx emissions. Therefore, NOx is one of the most important components of diesel engine emissions, so emission regulations are increasingly demanding NOx reduction. With the implementation of the national emission regulations in China, Selective Catalytic Reduction (SCR) will become the preferred solution for many exhaust system manufacturers, diesel engines and even OEMs. The chemical reaction used in this technology is:
The controller product is the core component of the diesel exhaust aftertreatment system, and its control schematic is as follows:
• Diesel exhaust aftertreatment systems include:
♦ SCR control unit
The SCR control unit is the diesel exhaust aftertreatment system electronic control unit (DCU). The DCU communicates with other controllers via CAN;
♦ Urea supply device
a urea supply device for supplying a urea solution;
♦ Air supply unit
An air supply device is used to assist the supply of air;
♦ Pre-oxidation catalyst
Placed in front of the SCR catalyst, as a pretreatment device for the engine exhaust, adjust the exhaust gas to the appropriate working range;
♦ SCR catalyst
In the SCR catalyst, a relatively complex chemical reaction occurs between the urea solution and NOx;
♦ Post oxidation catalyst
Generally used to eliminate the leakage of ammonia.
•Product Features
The main functions of the SCR control unit are as follows:
♦ Obtain signals from other controllers from CAN;
♦ Various sensor signal acquisition;
♦ Calculation of urea injection volume;
♦ Calculation of auxiliary air supply;
♦ Various actuator drives;
♦ Diagnosis.
•Product advantages
Compared with other competitive products, its main advantages are as follows:
♦ Integrated urea injection quantity calculation and urea pump motor control function;
♦ 32-bit MCU with high clock frequency and large storage space;
♦ Rich in resources and adaptable, it has been successfully applied to EGR, electronic governor and DPF;
♦ UDS-based bootloader;
♦ Vehicle communication based on J1939;
♦ OBD based on J1979;
♦ IP6K7, high sealing level;
♦ anti-crushing impact;
♦ Back pressure protection.
• Customer value reflects
Using this product can bring the following value to customers:
♦ To enable the customer's complete vehicle, diesel engine or exhaust system to meet the national NOx emission limits for NOx;
♦ Not only provide customers with a hardware product, but also build a product development platform for customers and provide support and services for the platform. Customers can customize their own applications based on the platform, such as exhaust gas recirculation EGR (ExhaustGasRecirculation), electronics Governor and particle trap DPF (DieselParticulateFilter), etc.;
♦ Hengrun can help customers complete system architecture design, detailed solution design, product implementation and verification for specific applications, and has successfully matched customers such as Tenneco and Weichai.
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