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Diesel Particle Filter Tampering Detection during a Vehicle Periodic Technical Inspection

This study includes an emissions estimation for PM in PCs and a worst-case scenario estimation of PM emissions accounting for the DPF removal in PCs on the road today. Emission estimations were calculated using COPERT 5 (Computer Programme to calculate Emissions from Road Transport). PC fleet structure and activity data in form of odometer readings used were taken from the CVH database for the year 2016. The current emission test during PTI for PCs equipped with a diesel engine is conducted with an exhaust gas opacity meter which measures the optical properties of the exhaust gases expressed as a K value (smoke density). There is a correlation between K value and PM emissions (Mridul et al., 2008). This testing method, however, is insufficient for diesel engines from EURO 4 onwards because of the instruments resolution limit. Average K value data was calculated for PCs from the PTI emission tests. PTI inspectors are required to visually check for the presence of the DPF, but they can’t detect if a DPF was drilled out or removed from its housing. At this moment, there are no simple methods of detecting DPF tampering. For a method to be applicable during a PTI inspection it must be simple, fast and without any significant mechanical disassembly of the parts. Thermography, a none destructive testing (NDT) method was used as a tool to gather exhaust systems isolation temperature values in order to determine the method applicability for PTI.

COPERT ; Diesel Particle Filter Tempering ; Periodic Technical Inspection ; Thermography

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