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Opus' remote sensing devices have helped to expose on-road NOx emissions from trucks equipped with defeat devices.
HDDVs contribute a disproportionate amount of nitrogen oxides and particulate emission from motor vehicles. Unfortunately few HDDV inspection programs exist and those that do only conduct a smoke opacity test. Remote sensing can help to fill this gap, providing much needed real world emission data to monitor HDDV emissions.
Opus remote sensing has contributed significantly to HDDV surveillance efforts. In the late 1990s we helped expose the high on-road NOx emissions from trucks equipped with defeat devices (Reference). More recently Opus remote sensing has been used to identify individual aftermarket defeat devices used to avoid the cost of meeting low emission regulations.
In 2017, Opus Remote Sensing Europe helped the Danish police in a project to identify high-emitting trucks whose drivers had fitted defeat devices or disconnected their emission controls to cheat on low emission regulations. Roadside remote sensing inspections were carried out at several locations in Copenhagen and on the border between Denmark and Germany. If the pollutant levels were above limits, the police stopped the truck for an immediate inspection, providing a highly-effective way to enforce emission standards.
Opus has developed a non-contact exhaust sampling technique that can perform a large suite of detailed pollutant tests as HDDVs drive through. The OHMS is a 100-foot long tented structure that continuously samples exhaust emissions and channels them through specialized gas and particulate analyzers. It is designed to measure emissions without the need to take them out of commercial service or invest in large scale dynamometers capable of testing them on site. With a registration check and payment collection, it can offer an inexpensive and practical mobile alternative to brick-and mortar inspection stations.
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