Allison Transmission Unveils Electric Component Option for Buses and Coaches

Allison Transmission has announced a new option to fully electrify components used with its H 40/50 EP™ hybrid propulsion system for transit buses and coaches.

Co-developed with Vanner Inc., Increased Accessory Power II (IAP II) is a customizable electric distribution platform that provides power from the hybrid system to accessory components such as electric air conditioning, electric air compressors and power steering systems.

IAP II includes either a Single or Dual Hybrid Beltless Alternator (HBA).

“Allison’s standard H 40/50 EP system typically improves fuel economy up to 25 percent over standard diesel buses,” said Michael G. Headly, senior vice president of global marketing, sales and service for Allison Transmission. “When using a Vanner HBA with our system, a number of transit agencies in the U.S. have reported an additional average fuel economy improvement of 16 percent, for a total improvement up to 41 percent or more.”

In addition to improving fuel economy, IAP II has also demonstrated these benefits:

• Allows accessories to operate at the most efficient speeds, improving energy management by reducing parasitic loads.
• Increases brake responsiveness by building air brake pressure faster than a conventional engine-driven pump.
• Improves low-speed vehicle maneuverability due to smoother power steering.
• Enables faster cabin cooling, without straining the engine or burning unnecessary fuel by running engines at high idle.

Category: General Update