The Keyword In Future HD Testing Is "Dynamic"

   The new European Directive 1999/96/EC introduced dynamic or transient exhaust emission measurements for heavy-duty engines. The rationale for this is that a transient test, which includes rapid load changes and even simulated engine braking, describes real-life emission performance better than traditional steady-state testing.
   At first transient testing is required for all gas-fuelled engines and also diesel engine equipped with advanced aftertreatment systems including de-NOx catalysts and particulate traps. Eventually all road-going engines will be dynamically tested.
   Furthermore, these new regulations will affect not only type approvals of engines, but also test procedures used for R&D on fuels, engines and emission control devices.
  There are also needs to measure complete heavy-duty vehicles dynamically. The determination of emission factors, follow-up of field tests and the evaluation of new vehicle technology and other corresponding tasks are more easily conducted with a complete vehicle on a chassis dynamometer, rather than with an engine in an engine dynamometer.

      To meet the research and testing needs of the future, VTT Energy is building a new heavy-duty test laboratory. These new facilities, which will be completed at the end of 2001, comprise a dynamic engine test stand, a fully dynamic chassis dynamometer for heavy-duty vehicles and an emission measurement system including a full-flow CVS device. We will be able to perform ESC, ELR and ETC tests in the engine dyno and dynamic vehicle tests with buses and trucks on the chassis dynamometer. 
    Furthermore, we already have a wide range of analysers for special emission measurements, including instrumentation to measure on-line many unregulated emission components and particulate size distribution. These special instruments we will also use in conjunction with the new heavy-duty facilities. 

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