Diesel particulate filters and NOx reduction

Troels Dyhr Pedersen

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Diesel particulate filters and NOx reduction

Today’s diesel particulate filters are designed to remove as much as 99 % of the soot particles from the exhaust. The efficiency of the filters however vary, depending on the age and use. We can determine if filters are defective (cracked), which is not possible with the standard instrumentation used in car inspections and workshops.     

From Euro 5B (diesel cars) and Euro VI (heavy-duty engines) the standards for exhaust include limits for the particle concentration, in addition to the existing limits for particle mass. We offer measurements of both particle mass and concentration, and are therefore able to verify that particulate filters meet their standards.

Urea-based NOx reduction is a complex technology, which require extensive optimization to operate properly. We offer precise, detailed and fast transient emission analysis of NO, NO2, nitrous oxide (N2O) and ammonia (NH3), which is essential information for both optimization and compliance testing.

We can set up and perform tests on both individual components and complete systems in a controlled environment. We have a 230 kW Scania diesel engine with fully programmable engine management and a 1.4 HDI Peugeot diesel engine. This test environment is suited for both development and compliance testing of heavy duty systems.

We can also test vehicle emissions in our passenger car and heavy-duty chassis dynamometers. These tests can be used to verify compliance with Euro standards, as well as simple diagnosis of defective systems. 

We always document our work and results according to the nature of the task.