Bosch 0281020112 Common-Rail Pressure Sensor – Precision Rail Pressure Measurement for CAT C7/C9/C9.3 and Industrial Diesel Systems
1. Product: 0281020112
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
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Product Introduction
In the closed-loop architecture of a common-rail fuel system, the injectors are the actuators, but the rail pressure sensor is the sensory nerve that provides the feedback necessary for the ECM to maintain the commanded pressure. Without accurate pressure measurement, the ECM cannot determine the correct injection timing or quantity, and the closed-loop control becomes unstable. The Bosch 0281020112 is a piezoresistive rail pressure sensor that delivers a linear output signal proportional to the rail pressure, with a measurement accuracy of ±1.5% across the full operating range. This level of precision ensures that the ECM receives reliable pressure data, allowing it to maintain stable injection timing and consistent fuel delivery.
Piezoresistive Technology – The Science of Pressure-to-Signal Conversion
The 0281020112 uses a piezoresistive sensing element-a silicon micro-machined diaphragm with implanted resistors that change resistance in response to pressure-induced strain. When the rail pressure is applied to the diaphragm, the resistors experience a change in resistance, which is converted into a voltage signal by a bridge circuit. The output voltage ranges from 0.5 V (at 0 bar) to 4.5 V (at the maximum pressure), providing a high-resolution signal that the ECM can interpret with precision. The sensing element is temperature-compensated, maintaining its accuracy within the specified ±1.5% across a temperature range of -40°C to 120°C.
Signal Characteristics – The ECM's Window into Rail Pressure
The 0281020112 is designed to operate with a 5 V supply voltage (typical for diesel ECMs) and delivers a linear output signal that is directly proportional to the rail pressure. The key characteristics are:
Supply voltage: 4.75–5.25 V DC
Output signal: 0.5–4.5 V (ratiometric to supply)
Pressure range: 0–200 bar (low range) to 0–2,000 bar (high range)
Accuracy: ±1.5% over temperature and life
Response time: ≤ 1 ms
Temperature range: -40°C to 120°C
Housing: Stainless steel with integrated sealing ring