Exhaust Gas &
Differential Pressure Sensor

Q: What are exhaust differential pressure sensors?

Exhaust differential pressure sensors measure the pressure difference between two points in the exhaust system, typically before and after a diesel particulate filter (DPF). This measurement helps monitor and control exhaust emissions and optimize engine performance.

Q: Where are these sensors commonly installed?

These sensors are usually installed in strategic locations in the exhaust system , such as before and after the DPF and exhaust gas recirculation (EGR) valve. Their positioning ensures accurate monitoring of exhaust pressure changes.

Q: Why are exhaust differential pressure sensors important in diesel engines?

In diesel engines, these sensors are crucial for maintaining the DPF's efficiency. They detect when the filter is becoming clogged and needs regeneration, preventing potential engine damage and ensuring compliance with emissions standards.

Q: How do these sensors contribute to environmental standards?

By accurately monitoring and managing exhaust pressure, these sensors help maintain the effectiveness of emission control systems. This ensures vehicles meet stringent environmental regulations, reducing harmful pollutants released into the atmosphere.

Q: What types of NTK exhaust pressure sensors are available?

Various types of NTK exhaust pressure sensors are available, including absolute pressure sensors that measure the absolute pressure at important locations, high-pressure sensors for precise measurements in high pressure ranges, and differential pressure sensors that specifically measure pressure differences at various points in the exhaust system.

Q: What happens if the exhaust pressure is too high or too low?

High exhaust pressure can lead to overheating and potential engine damage, while low pressure can reduce turbocharger efficiency. Differential pressure sensors help maintain optimal pressure, ensuring safe and efficient engine operation.

Q: How do these sensors interact with the ECU?

These sensors send real-time data to the engine control unit (ECU) , which uses this information to adjust parameters like exhaust gas flow and temperature. This interaction ensures optimal engine performance and effective emissions control.

Q: Can these sensors be used in petrol engines?

Yes, while traditionally used in diesel engines, exhaust differential pressure sensors are increasingly being incorporated into modern petrol engines. They help monitor and manage exhaust pressure, contributing to better engine performance and lower emissions.

Q: What role do these sensors play in turbocharged engines?

In turbocharged engines, exhaust differential pressure sensors ensure the turbocharger operates efficiently by maintaining the correct exhaust pressure. This helps maximize the turbocharger's performance and longevity while optimizing engine power output.

Q: What kind of support does Niterra provide for their sensors?

Niterra offers comprehensive technical support for their exhaust differential pressure sensors. This includes online training resources, instructional videos, and customer service to assist with installation, troubleshooting, and maintenance of the sensors.

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.

Around 87 million cars equipped in EMEA (source: TecDoc)

Meeting today’s environmental EU norms

62% coverage of vehicles in operation in EMEA

Comprehensive technical support

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.