The NTK Exhaust and Differential Pressure Sensors

Q: Exhaust pressure sensors (EPS)

NTK exhaust gas pressure sensors provide an absolute pressure measurement of exhaust gases.

Q: Differential pressure sensors (DPS)

The DPS measures the pressure drop between two positions in the flow pattern. It is installed at various points in the exhaust manifold. At one position, it regulates the low-pressure gas recirculation. At the other location, it monitors the function of the particulate filter and reports the charge status back to the control unit (ECU).

Q: High pressure sensors (HPS)

NTK high pressure sensors are special exhaust pressure sensors, but designed for higher pressures.

Monitoring exhaust pressure

Exhaust and Differential Pressure Sensors (EDPS) are found in all of today's diesel engines, as well as in a growing number of gasoline engines. Alongside various other diverse engine components, it ensures that exhaust gases comply with today's strict standards.

Modern engines in the European market are equipped with exhaust and differential pressure sensors

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Types of EDPS and its technology

Exhaust gas pressure sensors are often installed at several locations along the exhaust line to ensure the correct functioning of various components and to protect them from excessive pressure.

They are often located upstream and downstream of the exhaust gas recirculation valves, where they help ensure the proper exhaust gas recirculation rate and help keep emissions low and engine performance constant.

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 the fine particles captured by the filter. A drop in the pressure signal downstream of the DPF indicates that the filter is beginning to fill. To prevent clogging and ensure optimal performance, the pressure sensor sends a signal to the ECU to increase the temperature of the exhaust gases and allow the filter to regenerate, extending the life of these filters.

EDP sensors on a green-highlighted background

Function Principles

In diesel engines, pressure sensors work to extend the life of the diesel particulate filter (DPF). These filters have an optimum operating temperature at which they can efficiently burn the fine particles captured by the filter. A drop in the pressure signal indicates that the filter is beginning to fill. To prevent clogging and ensure optimal performance, the pressure sensor sends a signal to the engine control unit (ECU) to increase the temperature of the exhaust gases and allow the filter to regenerate. Thanks to the turbocharger, modern gasoline engines are both compact and powerful. If the pressure of the exhaust gases is too low, the turbocharger cannot provide optimum operating performance. If the pressure is too high, there is a risk of damage.