Exhaust Pressure Sensor & Differential Pressure Sensor

Q: Exhaust pressure sensors

NTK exhaust pressure sensors (EPS) provide an absolute pressure measurement of exhaust gases. These sensors monitor the pressure and warn should the back pressure become too high.

Q: High pressure sensors

High pressure sensors (HPS) are special sensors that do the same as the EPS, only for exhaust gases with higher pressure .

Q: Differential pressure sensors

Differential pressure sensors (DPS) are placed before and after components such as the diesel particulate filter (DPF), the otto particulate filter (OPF) or the exhaust gas recirculation valve (EGR). Changes in pressure here can signal that the unit being monitored is not working optimally.

Monitoring exhaust pressure

EDPS (Exhaust Gas & Differential Pressure Sensors) are found in all of today’s diesel engines as well as in a growing number of petrol engines. They protect various engine components and ensure that the exhaust gases meet today’s rigid standards.

Modern diesel engines in the European market are fitted with EDP sensors

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Types of EDPS and its technology

Exhaust pressure sensors are often installed at multiple points along the exhaust line to ensure the correct functioning of various components and protect them against excessive pressure.

They are commonly found before and after EGR valves, where they help to assure the correct exhaust gas recirculation rate, helping to keep emissions low and engine performance high.

In diesel engines, pressure sensors are installed before and/or after the diesel particulate filter (DPF). These filters have an optimum operating temperature at which they can efficiently burn off the fine particles captured by the filter. A drop in pressure signals that the filter is starting to fill up. To prevent clogging and ensure optimal performance, the pressure sensor sends a signal to the ECU to raise the temperature of the exhaust gases and enable the filter to regenerate, thereby preserving the life of these filters.

EDP sensors on a green-highlighted background

Function Principles

In diesel engines, pressure sensors work to preserve the life of the diesel particulate filter (DPF). These filters have an optimum operating temperature at which they can efficiently burn off of the fine particles captured by the filter. A drop in pressure signals that the filter is starting to fill up. To prevent clogging and ensure optimal performance, the pressure sensor sends a signal to the ECU to raise the temperature of the exhaust gases and enable the filter to regenerate.
Thanks to the turbocharger, modern petrol engines are both compact and powerful. When the pressure from the exhaust gases is too low, the turbocharger cannot deliver optimum operating performance. When the pressure is too high, there is the danger of overheating. Pressure sensors send signals to the engine control unit (ECU) to adjust the flow of gas as needed.