A brief comparison of ATF and WPT.
The biggest practical difference between ATF and WPT is that Westport's system is a dedicated NG system. This means that it is not meant to run on diesel fuel only. It does however require diesel as a pilot fuel to ignite the natural gas within the combustion chamber,as diesel engines have no spark plugs(the diesel fuel ignites due to the high compression in diesel engines).
AFS' system is dual fuel, allowing the vehicle to alternate fuels at the flip of a switch. It is a system built for here and now, where there may not be a NG filling station around the corner, especially if you have a piece of construction equipment, a logging truck, or a tug boat.
The technical difference is that WPT has patented a high pressure injection system, which boosts the gas to 3000 psi before it is introduced to the combustion chamber. This was originally developed as a solution to poor engine performance at low RPM's.
The ATF system introduces the gas at a much lower pressures (around 150 psi) with no loss of power or performance. This is made possible by ATF's advanced engine management system. AFS' Eagle is a proven performer, successfully configured on many different engines, including Caterpillar, Hino, Isuzu, Daewoo, etc....(ECOS is in final stages of securing blanket approval in Japan)
The Westport system is just beginning real world testing in three buses in California.
The AFS Eagle is being marketed around the world, having consistently met durability and emissions requirements.
best to all, tj |
