Allison Announces Launch of 9-Speed Transmission and Expanded Electrification Portfolio 

With its deep first gear ratio and industry-leading ratio coverage, the Allison 9-speed transmission, according to the company, provides significant fuel savings as the highly efficient gear train allows the torque converter to lock up early in first gear. Additionally, the 9-speed includes an optional integral engine stop-start system that provides immediate transmission engagement and vehicle hold while the engine is restarted. Providing value for a variety of applications, the 9-speed transmission is ideal for distribution trucks, rental and lease trucks, and school buses.

The Allison 9-speed model leverages the proven durability of the Allison 2000 Series™ 6-speed transmissions, which have accumulated more than 100 billion miles globally. It has been designed to utilize the same vehicle manufacturer’s interfaces as its 6-speed predecessor, providing ease of integration into vehicles currently released with the Allison 2000 Series.

In addition to the 9-speed transmission, Allison also announced the expansion of its electrification portfolio with an electric hybrid system that includes a purely electric extended range—up to 15 kilometers. Ideal for transit bus and motor coach applications, the system features zero-emissions with engine off, including approaching, during and leaving passenger stops for a quieter and healthier environment.

Additional features include a higher energy Li-ion battery for extended engine off range; a smaller, lighter dual inverter with water ethylene glycol cooling for more efficient operation; and Increased Power Accessory II to improve fuel economy by using the hybrid system to power accessory components like air conditioning, air compressors and power steering.

The system is pure electric capable, but no electric charging infrastructure is required. Battery charging is accomplished via regenerative braking and engine operation. The regenerative braking capability can extend the brake change interval by up to 350 percent. The two-mode split parallel architecture improves fuel economy up to 25 percent.

Backwards compatible to fourth generation electronic controls, which were first produced in 2005, the new connected capabilities will provide insight into over 170 different transmission conditions. This will provide fleet management and maintenance staff with the insight they need to improve vehicle uptime.

Allison will begin delivering transmission health information via multiple North American TSPs by year-end.