Fuel rail pressure sensor
The rail pressure sensor is mounted at one end of the rail, primarily to measure the fuel pressure in the common rail. It passes through the silicon film
Sensing unit) measures the instantaneous fuel pressure in the rail, and the sensor element is mounted on the silicon membrane to convert the fuel pressure into
Voltage output. The core of the sensor is a steel membrane and the test medium is impermeable. Wheatstone bridge circuit on steel film surface
An integrated strain element (four variable resistors integrated into the upper surface of the steel film in a Wheatstone bridge).
When it is born, the resistance of the bridge circuit is changed due to strain generated by the strain element.
The resulting strain causes the bridge circuit resistance to change and causes the 5V bridge at both ends of the resistor element.
The voltage changes. The bridge circuit voltage has a corresponding relationship with the pressure of the steel film and passes through the metal wire.
Connected to the evaluation circuit, amplified by a digital ASIC and converted to an output signal. Output signal is transmitted through the harness
It is sent to the control unit, and the pressure is calculated by the characteristic curve inside the control unit.
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