Dongfeng 3615010-E6309 Aftertreatment Control Unit Assembly

This aftertreatment electronic control unit (DCU/ACM) serves as the central controller for the Selective Catalytic Reduction (SCR) system on Dongfeng commercial vehicles. It processes real-time data from upstream and downstream NOx sensors to precisely regulate the urea injection quantity via the urea pump or dosing valve, ensuring NOx conversion efficiency meets Euro IV, V, and VI regulatory limits. The unit features a sealed aluminum housing designed for harsh under-chassis environments, offering IP67/IP69K ingress protection against high-pressure washing, vibration, and thermal cycling (-40°C to +85°C operating range). It communicates via SAE J1939 CAN protocol with the vehicle ECU and diagnostics tools. The assembly integrates high-reliability automotive-grade microcontrollers and power drivers for the urea pump motor and heater circuits. Multiple hardware variants exist (e.g., -T68M4, -TF980, -TL381, -T25FD, -KJ1QB) calibrated for specific engine ratings and vehicle platforms including Dongfeng Tianlong, KX, and GX series tractors and dump trucks.