PEMS

Mobile Exhaust Gas Flow Sensors and Measurement for Passenger Cars and Commercial Vehicles (PEMS)

Since the diesel scandal, the demand for reliable gas mass measurement for portable emission monitoring systems (PEMS) is high. Having exact data on real drive emissions has become even more essential for manufacturers of both passenger and commercial vehicles than before.

We support you in developing and using PEMS with customized versions of our TFI4B platform. The TFI4B is a sensor system consisting of differential pressure, absolute pressure and temperature sensors. A CAN bus provides the necessary connection to an engine control unit (ECU) or a mobile data logger system. The core electronics have a powerful microprocessor that processes, filters and calculates the signals. This means that we deliver the measurement directly to you and you do not need to use any other resources – our TFI4B platform works as an RDE (real drive emission) meter.

Learn more about our “Mini PEMS”, which we developed in cooperation with the German Federal Motor Transport Authority (KBA). Click here.

PEMS

Real-Time Signal Analysis – Mobile Emission Testing Made Easy

To measure a vehicle’s emissions on the road, you first need small, lightweight measurement components to be used as an RDE meter. The lighter the real drive emission measurement solution, the more accurate the results and the more convenient the handling.
PEMS need to withstand high exhaust temperatures above 500°C . They must also be able to cope with pulsations in flow and pressure.

Our systec PEMS (portable emission monitoring system) meets all these requirements perfectly. The ultra fast electronics are sampling differential pressure, absolute pressure and temperature with up to 2 kHz. They are based on the TFI4B, which is used by many combustion engine manufacturers in series. In the PEMS version, these electronics are supported by an external high temperature thermometer – a CAN based PT-1000. The pressure sensors with the electronics are located in a stainless steel housing, protected against temperature and environmental influences, and separated from the hot venturi by hoses or steel pipes for thermal decoupling.

systec’s PEMS, like its TFI4B series counterparts, handles pulsations perfectly due to its ultra high sampling rate. This provides highest accuracy in highly dynamic drive. The mass flow signal is calculated with 2 kHz and then filtered to a stable value which is digitally transmitted via CAN-Bus, together with pressure, temperature and a complete OBD. The primary elements – usually venturis or dynamic pressure probes – can be easily dismounted and cleaned if necessary.

TFI4B-2P-in use-Anwendung
PEMS flow meter

Exhaust gas flow sensors for passenger cars and commercial vehicles: systec PEMS has clear advantages!

The measurement of flow and pressure close to the engine is subject to pulsations, condensates and NHC, especially in mobile exhaust gas measurement on commercial vehicles. There is a complex pressure-flow characteristic in the exhaust gas, which depends on the engine map, aging, ambient conditions (air pressure, air temperature) and other variables. Since pressure and flow are connected by energy conservation, both variables must always be considered for accurate volume measurement in the case of pulsations.

Conventional PEMS measurement systems can only deal with these challenges to a limited extent: the low sampling rates and slow sensors lead to large calculation errors. The results are often unsatisfactory.

The systec PEMS measures pressure, temperature and differential pressure up to 2000 times per second and analyzes the condition of the fluid in the pipe in real time for perfect flow calculation. Complex evaluation and filtering technologies are used to calculate a precise and dynamic flow rate. The result is maximum accuracy in all operating conditions without engine maps.

A systec PEMS (portable emission monitoring system) is always fully optimized and calibrated to customer requirements. This ensures that the PEMS works with low pressure loss and with the required accuracy on the vehicle, both for exhaust gas flow sensors on passenger cars and on commercial vehicles. These advantages have also been confirmed by the KBA in extensive comparative tests (see download article below).

Benefits

High accuracy under highly dynamic and pulsating conditions

Compact measurement of flow at high temperature resistance

Fast and simple adaptability to new applications

Perfectly calibrated sensors

No drift by contaminants such as oil or condensate film

Lifetime up to 1 million miles

Applications
  • Precise air management (cars, trucks, off-road-vehicles)
  • Determination of EGR rate
  • Combi sensors (p, T) with special ranges
  • Boost-pressure-sensors
  • Special sensors
Specifications
Ambient conditions-40..125°C
Fluid-Temperature-40..900°C
Fluid-Pressure0,5-4,5bar abs(other o.r.)
Differential Pressure-50..250mbar (other o.r.)
FluidAir, Exhaust gas, EGR
Accuracy (new)T +/- 1K, p +/- 0,3% d.MBE*, dp +/- 0,3% d.MBE*
Accuracy (life time)T +/- 2K, p +/- 1,8% d.MBE*, dp +/- 1,5% d.MBE*
Accuracy flow<1:10MBE*: 0,35%d.MBE*; >1:10MBE: +/-2% v.MW*
ConnectorTYCO heavy duty, HDSCS-6pin (other o.r.)
CommunikationCAN-Bus (other o.r. (PWM, LIN, 0..5VDC)
Power Supply5VDC stabilized, 35mA
 *MBE= of span
*MW= of measured value
Downloads
Inquiry


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