Description
(1) Diesel high pressure sensor
"a" 3-way black connector
Make: Bosch
The diesel fuel high pressure sensor is of the piezo-resistive type (with integral electronics)
Role
The diesel fuel high pressure sensor measures the value of the high pressure in the fuel high pressure common injection rail
Function
"b" detection cell
"c" diaphragm
"d" entry of the diesel fuel into the sensor
The resistance of the diesel fuel high pressure sensor varies as a function of the pressure of the fuel in the fuel high pressure common injection rail (the more the pressure increases, the more its resistance increases)
The detection cell "b" includes the piezo-resistors fitted as a Wheastone bridge on a membrane that is subjected to the pressure of the aircon fluid
The piezo-resistors convert the change in shape of the detection cell "b" into a variation in resistance, then into a variation in voltage via the Wheastone bridge
An electronic stage amplifies the signal produced by the detection cell "b"
Electrical features
"U" output voltage of the diesel fuel high pressure sensor for a supply voltage of 5V
"P" pressure of the fuel in the fuel injection rail
The output voltage of the diesel fuel high pressure sensor is proportional to the pressure of the fuel in the fuel high pressure common injection rail
| designation | value |
|---|---|
| supply voltage | 5 Volts |
| pressure range measured | 0 bar ≤ pressure measured ≤ 1600 bars |
| output voltage: 0 bar | 0,5 Volts |
| output voltage: 1600 bars | 4,5 Volts |
| channel number | allocation of channels of connector |
|---|---|
| 1 | earth |
| 2 | output signal |
| 3 | supply voltage |
Learning / initialisation
Programming is necessary if the part is removed/refitted