Measuring real-driving emissions of VEHICLES EQUIPPED WITH DIFFERENT TYPES OF propulsion SYSTEMS

Opus RSE evaluated the real-driving emissions of the same type of vehicle under different diesel, LPG and CNG systems installed by DualFuel. These tests evaluate how pollutant emissions change according to the type of propulsion. This type of audits provides a method of quantifying the savings in pollutants for private companies that update their vehicle fleet, for example of delivery vans.


Diesel retrofits offer a number of benefits over other emissions reduction strategies, including cost effectiveness and immediate, significant reductions. The term “retrofit” covers many technologies and activities to reduce emissions from older engines, vehicles and equipment. While the term is frequently used as a label describing various exhaust emissions control devices, such as the diesel oxidation catalysts and particulate filters, it can also encompass a broader range of options to reduce emissions, including re-powering, rebuilding and in some instances replacing existing equipment.


Modern GLP or GNC propulsion systems can be a good alternative to reduce consumption and emissions. Some companies also offer fuel additives that promise to reduce particulate matter or NOx emissions.


In either case, the only way to know if these strategies are effective is to measure the actual emissions emitted by the vehicles in serious, controlled experiments. Oous RSE offers these measurements, which are very valuable for companies that offer retrofitting services as well as for companies that are considering modifying their fleet of vehicles.


THE TEST for dual fuel

In this project, three identical vehicles (same model, engine and state of the vehicle) were analysed under four different conditions: original unmodified diesel, a Fuel Fusion system with two different LPG maps and a Fuel Fusion system with CNG. 


The measurements were done in a controlled location in Madrid.


Each vehicle was audited several times to have suffient records at different driving conditions. Real fel consumptions were also recorded.


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Some very interesting conclusions were found:

  • The Fuel Fusion systems clearly reduced hydrocarbon and NOx emissions by a factor of up to 3.
  • To a lesser extent, particulate matter emissions were also reduced.

Opus RSE

Gaztambide, 45

28015, Madrid (Spain)

Phone: (+34) 91 559 28 68


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