Interest in performing engine exhaust measurements on-board a vehicle instead of a dynamometer is continually growing as the emissions from engines have been found vary depending on the environmental and driving conditions. On-board measurements give better information on real–world emissions when the driving conditions and vehicle speed are not strictly controlled. The requirements for measurement instruments, however, are quite different in PEMS measurements compared to well controlled test cell conditions. Typical additional requirements include low power consumption and insensitivity to vibration and varying environmental conditions.
Dekati® Solutions for PEMS measurements include:
Dekati® Mass Monitor, DMM, is a real–time measurement instrument for monitoring PM emissions from diesel and gasoline vehicles in both dynamometer as well as in on–board conditions. Since the sensitivity of the DMM goes as low as 1 μm⁄m³ it is well suited for accurate measurements even in post–DPF conditions. The DMM is designed for daily routine measurements thus special attention has been paid to usability issues related to daily operation and service of the instrument. The instrument's robust structure and insusceptibility to vibration make the DMM an excellent choice also for PEMS measurements.
The DMM system is set up in tailpipe measurements with a well–designed sample conditioning system. Depending on the exhaust conditions the setup can be e.g.
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