At the Advanced Clean Technology Expo in Long Beach, California, Allison Transmission introduced the new ABE Series, the first e-axle advanced ultra-low floor electric bus powertrain system in the market. The ABE Series e-axles are one of the world’s most powerful and compact fully integrated electric axles for the transit bus market.

The ABE Series integrates dual-electric motors, a single- or multi-speed gearbox (depending on e-axle model), oil coolers, pumps, and power electronics into a bolt-in system that replaces the entire traditional powertrain within the existing frame. It meets the power and space demands of the transit bus industry, including heavy double-decker, articulated, and three-door buses.

The Allison ABE Series can operate without restrictions at regular highway speeds, and on all allowable grades. The system can handle 100% torque in regenerative braking. With an axle rating up to 28,660 pounds, the system provides more power and torque than any other e-powertrain system in its class on the market. With a dual motor, it has continuous axle output power of 536 horsepower and peak output power of 738 horsepower. A single speed e-axle option also is available. Its proprietary cooling allows for industry-best continuous motor power and allows the vehicle to run closer to peak power for longer durations.

An attractive feature for bus manufacturers is the system’s compact design. The bolt-in ABE Series fits existing bus frames and suspensions, creating more space for battery packs and other critical electric vehicle components. The standard system is configured for a 28-inch walk through, but has an optional 39-inch configuration. This makes the system applicable for 40-foot low-floor city and double-decker buses, 60-foot articulated buses, and three-door buses.