Superior Euro VI RDE performance proven by independent test labs

Amminex’ ASDS™ technology has passed all relevant formal tests required to carry out large-scale retrofit projects in cities. Our test data shows that ASDS™ is fully compliant with Euro VI regulations and includes data from standard test cycles such as WHTP (DTI), Millbrook (DTI) and the Braunschweigh (VTT) city cycle. Since data form test cycles never fully represents real world driving, Emissions Analytics have also performed PEMS testing on-road of ASDS™. Data from these tests shows that ASDS™ is up to five times better than Euro VI RDE legislations in real-driving conditions in congested city traffic.

 

PEMS testing shows ultra-low NO2 emissions from Copenhagen buses

PEMS testing by Emissions Analytics confirms that buses retrofitted with ASDS™ in Copenhagen meet Euro VI emissions requirements in real urban driving. The NOx conformity factor is 0.3 – well below the allowed factor 1.5 for commercial vehicles.  Moreover, the elimination of NO2, the most toxic constituent of NOx, is particularly impressive with a 99% reduction.

Emissions Analytics tested a 16 ton bus in Copenhagen. The vehicle, originally certified for Euro V, was retrofitted with ASDS™ and an SCRT from Eminox. The bus belongs to a fleet of 300 vehicles operated in Copenhagen by the public transportation company, Movia. The fleet has been upgraded from Euro III/IV/V to meet the latest Euro VI/RDE emission standard. The bus emitted only 0.15 g NOx/kWh, which is well below the Euro VI regulated level of 0.46 g NOx/kWh – corresponding to a conformity factor of 0.3.

Superior DeNOx, even at low speeds in congested driving

This graph shows trip-averaged values of DeNOx (%) and speed (km/h) on a bus with ASDS™ in London city traffic. Data was obtained from 6000 kilometers of operation corresponding to 500 trips. ASDS™ provides high performance, even below 5 km/hr.

Type I installation example:
From 32% to 85% NOx reduction

Data examples from a bus driving on Knightsbridge, one of London’s most congested roads. The bus is a Euro IV vehicle that has been upgraded with an ASDS™ type I installation (simple swap of OEM liquid system with no changes of the existing exhaust system or SCR).

Type II installation example:
99% NOx reduction

NOxTracker™ data from a Copenhagen city bus with a Type II installation including ASDS™ technology and a new SCRT catalyst based emissions system UK based from Eminox Ltd.

The operational data indicates a NOx removal of in the range of 95-99%. Following retrofit the bus conforms not only to the Euro VI standard, but also the additional expected future tightening of this standard that caters for real driving emissions (RDE).

 

Winter testing proves effective NOx removal, even in extremely low temperatures

One of the distinct advantages of Amminex’ technology is that it removes NOx even at extremely low exhaust temperatures and works effectively due to fast start-up and no risk of freezing. The primary reason that Amminex’ technology injects ammonia gas to the exhaust stream as opposed to the liquid (and thereby freezable) urea solution used in conventional technology. Recently Amminex’ claims in this field have been backed up by new data from a winter trial carried out on number of buses operating in city traffic at very low ambient temperatures in Copenhagen, Helsinki and Sundsvall, a city in Northern Sweden.

As part of the test, existing AdBlue systems were swapped with ASDS™ on Euro IV and V vehicles and log data was obtained in areas such as engine NOx out, tailpipe NOx and general performance. The trial conclusion is clear: ASDS™ works well and trouble free at low temperatures, where prevailing technology struggles significantly and is de-activated often. The only effect is a slightly higher energy consumption of 100 W at temperatures around -20°C.

For example, when buses ‘cold start’ in a temperatures ranging from -10°C to -20°C, the start-up unit quickly enables dosing of ammonia making it possible to remove NOx from the exhaust. Furthermore, the ASDS™ cartridges are not sensitive to ambient temperature and can be stored and replaced easily on the vehicle at any occurring ambient temperature.

 

AdAmmine cartridges can be stored or transported at temperatures ranging anywhere from -40° to +80° making them virtually 'climate independent'. This is not the case for the watery, liquid ammonia solution used in prevailing emissions technology which freezes at -11°.

ASDS™ engine bench test: Major NOx reduction impact and fuel savings

ASDS™ was recently tested on an engine bench at the Graz University of Technology in Austria, to investigate the deNOx and fuel saving potential of the technology on a typical engine in the LCV segment. The results demonstrated that ASDS™ has an excellent performance on homologation cycles achieving NOx conformity factors down to 0,5. This means that the engine emitted 50% below the current legal NOx emission limits and is fully Euro VI compliant. This performance boost is partly achieved from the effective dosing of gaseous ammonia and removal of NOx in the low exhaust temperature range from 140-180°C.

Due to the reduced effort in reaching the engine emission compliance, ASDS™ could also be used to significantly optimize the fuel consumption. Preliminary results are showing in the range of 2% fuel consumption reduction, while still being compliant with the Euro VI emission legislation.

The tests were performed in the framework of the Horizon2020 funded project CARVE (Clean Air - Reduce Vehicle Emissions) that is funded by the EU's R&D program Horizon 2020 (Grant no. 684467). The project objective is to show that Amminex’ already commercial ASDS™ technology and components for buses and trucks can be adapted to work in small to medium sized engines in passenger cars, light commercial vehicles and vans. Special focus is on compliance with existing and future legislation, fuel savings, CO2 benefits and NO2 reduction. Tests are done both in engine labs (such as the recent LCV demonstration in Graz) as wells as real driving conditions.