Description
(1) particle filter differential pressure sensor
"a" pressure take-off upstream of the particle filter
"b" pressure take-off downstream of the particle filter
"c" 3-way black connector
Role
The particle filter differential pressure sensor measures the difference in the pressure of the exhaust gases between upstream and downstream of the cat converter and particle filter assembly
Function
(1) particle filter differential pressure sensor
"a" pressure take-off upstream of the particle filter
"b" pressure take-off downstream of the particle filter
"d" sensitive membrane
"e" integral electronics
The resistance of the particle filter differential pressure varies as a function of the difference between the pressure upstream of the particle filter and the pressure downstream of the particle filter (the greater the difference in pressure, the greater the resistance)
The sensitive membrane "d" receives the pressure upstream of the particle filter on its upper face and the pressure downstream of the particle filter on its lower face
An electronic stage "e" amplifies the signal produced by the sensitive membrane "d"
"U" output voltage of the particle filter differential pressure sensor
"dP" difference in the pressure measured between upstream and downstream of the particle filter (bar)
The output voltage of the particle filter differential pressure sensor is proportional to the difference in pressure between upstream and downstream of the particle filter
Electrical features
"B" percentage error
"T" ambient temperature in which the sensor is operating
The graph shows the percentage error as a function of the ambient temperature of the particle filter differential pressure sensor
- The least precise ranges of use (from ± 4 % to ± 2%) are between -30°C and - 15°C, and between + 100°C and +135°C
- The most precise range of use (± 2%) is between -15°C and + 100°C
| designation | value |
|---|---|
| supply voltage | 5 V |
| supply current | 20 mA |
| range of differential pressure measured | 0 bar ≤ differential pressure measured ≤ 1 bar |
| maximum upstream pressure permissible without irreversibly damaging the functioning of the sensor | 3 bars |
| maximum downstream pressure permissible without irreversibly damaging the functioning of the sensor | 2 bars |
| environmental temperature in use | -40 ≤ temperature ≤ +145 |
| maximum output impedance | 100 ohms |
| channel number | allocation of channels of connector |
|---|---|
| 1 | output signal |
| 2 | earth |
| 3 | supply voltage |
Learning / initialisation
Programming is necessary if the part is removed/refitted