Published - 2020

New: Differential Pressure Sensors for Diesel Particulate Filters

Tech news

Triscan's very comprehensive sensor programme has yet again been extended with a new member. With its more than 60 references in OE quality, differential pressure sensors for diesel particulate filters become the 14th product group in the sensor family.
 
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Differential pressure sensors are the latest type of sensor from Triscan

Differential pressure sensors are used on diesel engines with diesel particulate filters to determine the pressure difference between the exhaust gas inlet and the diesel particulate filter outlet. Combined with information about e.g. exhaust temperature, engine speed and airflow the vehicle's engine control determine (ECU), when to start a regeneration process of the filter where the accumulated soot is burned off.

The systems in which the differential pressure sensors are included are named differently depending on who the car manufacturer is. German manufacturers use the term DPS (Diesel Particel Filter), among French manufacturers FAP (Filters à Particules) and among Japanese manufacturers DPD (Diesel Particulate Defuser).

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System design


The differential pressure sensor's electronic circuit is fitted with a pressure sensor that separates two chambers inside the DPS-sensor housing. The pressure sensor generates a voltage signal between 0 and 5 volts. The output voltage increases as the pressure difference increases.
 
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Cross section of differential pressure sensor

On all types of differential pressure sensors, the input pressure is always measured via a hose connecting the sensor to the filter inlet. The outlet pressure is measured either as the ambient pressure via a hole in the sensor housing or via a hose connected to the filter outlet.