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The common rail pressure sensor is located on the fuel rail. Its function is to monitor the fuel pressure in the common rail. The sensor is used by the ECM as a part of the calculation for the % duty cycle applied to the Fuel Pressure Control Valve and Fuel Quantity Control Valve.
It’s a three-wire sensor: powered by the ECM, output signal and ground. Output range for Bosch, Delphi and Siemens rail pressure sensors and for the Denso sensors. Pressure measurement results from the bending of a steel diaphragm on which are located polysilicon strain-gauge elements. These are connected in the form of a Wheatstone bridge.
This permits high signal utilization and good temperature compensation. The measurement signal is amplified in an evaluation IC and corrected with respect to offset and sensitivity. At this point, temperature compensation again takes place so that the calibrated unit comprising the measuring cell and ASIC only has a very low temperature-dependence level.
Part of the evaluation IC is applied for a diagnostic function which can detect the following potential defects: Fracture of a bonding wire to the measuring cell; Fracture anywhere on any of the signal lines; Fracture of the bridge supply and ground.
The Global Automotive Common-rail injection sensor market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
Diesel Net Common Rail Fuel Injection – In the common rail system, fuel is distributed to the injectors from a high-pressure accumulator, called the rail. The rail is fed by a high-pressure fuel pump.
The pressure in the rail, as well as the start and end of the signal that activates the injector for each cylinder, are electronically controlled. Advantages of the common rail system include flexibility in controlling both the injection timing and injection rate.
The FRS is generally a piezoresistive type sensor that monitors the fuel pressure in the fuel rail as a varying voltage, which is utilised by the PCM as part of the calculation for the % duty cycle control for the Rail Pressure Control Solenoid (or Fuel Metering Solenoid or Suction Control Valve) to maintain a suitable rail pressure under all driving conditions. (current CRD systems now reach max pressures over 200MPa).
