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Working Principle: The Synergistic Effect of NOx Sensors and SCR Systems
The NOx sensor is the core monitoring component of the SCR (Selective Catalytic Reduction) system. Its role is to provide precise feedback signals to the SCR system by detecting the concentration of nitrogen oxides (NOx) in the exhaust gas in real time. This ensures that the injection amount of the reducing agent (such as urea solution) dynamically matches the NOx concentration, thereby achieving efficient emission reduction.
SCR System Workflow:
Exhaust Emission: Diesel engines produce exhaust gas containing NOx after combustion.
Urea Injection: A urea solution is precisely injected into the exhaust pipe by a metering pump, where it decomposes into ammonia gas (NH₃) at high temperatures.
Catalytic Reaction: Ammonia gas reacts with NOx on the surface of the catalyst (e.g., V₂O₅-TiO₂) in a reduction reaction, producing harmless N₂ and H₂O.
Real-Time Monitoring: The NOx sensor detects the NOx concentration in the treated exhaust gas and feeds the data back to the ECU (Electronic Control Unit), which dynamically adjusts the urea injection amount.
Core Functions of the NOx Sensor:
Based on the solid electrolyte type and the Nernst concentration cell principle, it measures the concentration difference between oxygen and NOx in the exhaust gas, outputting corresponding electrical signals to separately measure oxygen concentration and NOx concentration.
Ensures that the SCR system achieves an NOx conversion efficiency of 80%-97% within the temperature range of 200-400°C.
Working Principle: The Synergistic Effect of NOx Sensors and SCR Systems
The NOx sensor is the core monitoring component of the SCR (Selective Catalytic Reduction) system. Its role is to provide precise feedback signals to the SCR system by detecting the concentration of nitrogen oxides (NOx) in the exhaust gas in real time. This ensures that the injection amount of the reducing agent (such as urea solution) dynamically matches the NOx concentration, thereby achieving efficient emission reduction.
SCR System Workflow:
Exhaust Emission: Diesel engines produce exhaust gas containing NOx after combustion.
Urea Injection: A urea solution is precisely injected into the exhaust pipe by a metering pump, where it decomposes into ammonia gas (NH₃) at high temperatures.
Catalytic Reaction: Ammonia gas reacts with NOx on the surface of the catalyst (e.g., V₂O₅-TiO₂) in a reduction reaction, producing harmless N₂ and H₂O.
Real-Time Monitoring: The NOx sensor detects the NOx concentration in the treated exhaust gas and feeds the data back to the ECU (Electronic Control Unit), which dynamically adjusts the urea injection amount.
Core Functions of the NOx Sensor:
Based on the solid electrolyte type and the Nernst concentration cell principle, it measures the concentration difference between oxygen and NOx in the exhaust gas, outputting corresponding electrical signals to separately measure oxygen concentration and NOx concentration.
Ensures that the SCR system achieves an NOx conversion efficiency of 80%-97% within the temperature range of 200-400°C.
