Doosan DX140W/DX220LCA Excavator High-Performance Rail Pressure Sensor – Q&A Style Specification (English)

Q1: What are the product models and applicable scope of the high-performance rail pressure sensor for DX140W and DX220LCA?

Main Models

• 65.27114-5002: Dedicated to DX140W (matching its DL06 engine) and DX220LCA (matching its DL08 engine), with CE certification, net weight of 0.44kg, and compatibility with other Doosan models like DX180, DX210W, and DX255;
• 2549-9112 (25499112): A universal high-performance version for DX140W (Tier-II/Tier-III) and DX220LCA, also applicable to DX160LC, DX225LCA, and DX300LC excavators, with in-stock availability and global fast shipping.

Applicable Scope

• DX140W: Used in municipal road construction, urban greening, and small-scale earthmoving (light-to-medium load scenarios), monitoring the fuel rail pressure of its DL06 engine to ensure stable power output during mobile operation;
• DX220LCA: Deployed in infrastructure foundation works, quarrying, and large-scale earthmoving (medium-to-heavy load scenarios), real-time monitoring of the DL08 engine’s fuel rail pressure to prevent power loss during high-load digging and lifting.

Q2: What core functions does the high-performance rail pressure sensor perform for DX140W and DX220LCA?

Core Functions (Both Models)

• Real-time rail pressure detection: Converts the fuel rail’s hydraulic pressure into a linear voltage signal (0.5–4.5VDC) via an internal silicon membrane and Wheatstone bridge; for DX140W, it monitors pressures from 0 to 180MPa, while for DX220LCA, it covers 30–400kg/cm² (equivalent to 3–40MPa) working pressure range ;
• ECU closed-loop control feedback: Transmits the voltage signal to the engine ECU. The ECU adjusts the fuel metering unit’s opening according to the target rail pressure, ensuring the actual pressure matches the target value (e.g., maintaining 120MPa at rated speed for DX220LCA), avoiding under-injection (power loss) or over-injection (fuel waste);
• Fault self-diagnosis & protection: Triggers diagnostic trouble codes (e.g., P0192 for low input circuit) when detecting signal anomalies (e.g., voltage ≤0.70V for 0.5s). The ECU then activates a limp-home mode (fixed idle speed or limited power) to protect the engine from damage caused by abnormal rail pressure;
• High-precision data transmission: Adopts a 5VDC power supply (4.9–5.1VDC standard) with a sensitivity of 22.2mV/MPa, ensuring measurement accuracy of 0.7–2.5%FS, which is 30% higher than generic sensors, guaranteeing stable fuel injection for DX140W’s mobile operation and DX220LCA’s heavy-load work .

Model-Specific Optimizations

• DX140W: The 65.27114-5002 sensor has enhanced vibration resistance (adapted to the wheel-type excavator’s frequent movement) to prevent signal interference from chassis jolts;
• DX220LCA: The 2549-9112 sensor is optimized for high-temperature resistance, withstanding the DL08 engine’s high heat during continuous heavy-load operation, avoiding signal drift due to overheating.

Q3: What are the key technical parameters of the high-performance rail pressure sensor for DX140W/DX220LCA?