Allison Transmission says that bus operators using its xFE-transmission with Fuel Sense 2.0 software are reporting significant fuel savings in real-life operation. It is urging operators of its fully automatic transmissions to switch and in the UK, is offering upgrade opportunity for any bus with an existing Allison T2100 Series transmission from ADL, Optare or Wrightbus.
In September 2018, Optare announced all its single-deck buses would be fitted with Allison’s xFE fuel saving technology. This followed the launch of the Optare Metrocity xFE midibus in 2016, which is Low Emission Bus (LEB) accredited.
Allison’s xFE transmissions incorporate optimised gear ratios, which, coupled with the FuelSense Max package, deliver more lock-up operation and operate at lower engine speeds in higher ranges for further fuel economy improvements.
Through a set of proprietary software enhancements, FuelSense 2.0 uses DynActive Shifting to provide the bus with an infinitely variable combination of shift points. Rather than relying on fixed points on a shift table, FuelSense 2.0 uses a learning algorithm to continuously find the ideal balance of fuel economy and performance for the duty cycle, helping bus fleets to operate more efficiently.
Advanced FuelSense 2.0 packages include an improved Neutral at Stop feature and enhanced Acceleration Rate Management.