Yuchai engine parts Post processing electronic control unit assembly L6200-3823390B-1N

Built as the “brain” of Yuchai’s engine post-processing system, this ECU assembly delivers real-time, multi-dimensional control to optimize SCR and DPF performance. Equipped with a 32-bit high-performance MCU (Microcontroller Unit) with 1MB flash memory, it processes data from 12+ sensors (NOx, temperature, pressure) at a sampling rate of 100Hz. For SCR systems, it adjusts urea injection quantity (0-50mL/min) with ±2% accuracy based on NOx concentration, ensuring SCR efficiency ≥96% and NOx emissions ≤80mg/kWh. For DPF, it triggers active regeneration when soot loading exceeds 45g/L, controlling exhaust temperature between 550-600℃ to avoid filter damage. The ECU’s self-calibration function adapts to different fuel qualities, maintaining performance even with low-sulfur diesel variations

Engineered for the extreme environment of engine compartments (high temperature, vibration, oil mist), the ECU assembly features a durable, anti-interference design. The housing is made of die-cast aluminum alloy (ADC12) with anodic oxidation treatment, providing IP67 waterproof/dustproof protection and efficient heat dissipation (thermal resistance ≤0.8℃/W). Internal circuit boards use high-temperature FR4 material (resistant to 130℃) with conformal coating to prevent corrosion from oil mist and humidity. Power supply circuits integrate over-voltage (≥36V), over-current (≥20A), and reverse-polarity protection, avoiding damage from electrical anomalies. The assembly withstands 20g vibration loads (5-2000Hz, ISO 16750-3) and 500 thermal cycles (-40℃ to 105℃), ensuring stable operation in diverse working conditions

Equipped with Yuchai’s proprietary post-processing control software, the ECU assembly offers comprehensive diagnostic and maintenance functions to reduce fleet downtime. It supports UDS (Unified Diagnostic Services) protocol, enabling technicians to read real-time data (NOx emissions, urea level, DPF status) and fault codes via diagnostic tools (e.g., Yuchai YC-TECH). Fault codes are classified by severity (P0-P3 levels), with automatic limp-home mode activated for critical issues (e.g., urea exhaustion) to prevent engine power loss. The ECU stores 100+ historical fault records with time stamps, facilitating root-cause analysis. Software updates can be completed via CAN bus without disassembling the unit, ensuring compatibility with future emission regulation upgrades

Optimized for efficient fleet maintenance, the ECU assembly features a user-friendly plug-and-play design. The 68-pin main connector uses a quick-lock mechanism that mates with the engine wiring harness in 3 seconds, while 4 M6×16 galvanized bolts secure the ECU to the original mounting bracket—requiring only a torque wrench (10-12N·m) for installation. Two technicians can complete replacement in 30 minutes, 50% faster than non-OE units. The ECU’s components (MCU, capacitors, connectors) are sourced from automotive-grade suppliers (TI, TE), ensuring a service life of ≥200,000km—matching Yuchai engine’s durability. It comes with a 1-year/150,000km warranty, and its low power consumption (≤5W in standby mode) reduces battery drain during engine shutdown