Cat & BAE Systems Sign Transmission Agreement

April 4, 2011

BAE Systems and Caterpillar have signed a joint development agreement to collaborate on a parallel hybrid propulsion system for heavy-duty trucks. Under the agreement, BAE Systems will integrate Caterpillar CX Series Transmissions into its HybriDrive parallel propulsion system.

BAE Systems is a developer and producer of hybrid electric propulsion and power management systems for heavy-duty vehicles. The company’s HybriDrive series propulsion system is currently in service on more than 3000 transit buses and is designed to address the needs of vehicles with duty cycles that require higher operating speeds and less frequent stops.

The HybriDrive parallel system is based on a single electric machine, integrated between the engine and the transmission. The system can be installed with minimal impact to the vehicle, BAE said, and is designed to enhance propulsion through an optimized blending of internal combustion engine power and electric power. The system’s energy management and control capabilities ensure all energy flow—such as propulsion and recuperation—occurs in the most efficient fashion, resulting in lower fuel consumption and reduced emissions, BAE said.

The HybriDrive parallel system’s supplemental power and torque ratings range from 95 to 145 hp and torque of 300 to 400 lb.ft. respectively. The system is designed to support large-bore, heavy-duty engines, ranging from 350 to 600 hp, with associated torque ratings of 750 to 2,150 lb.ft.

The HybriDrive parallel system, in final stages of development, will see it first road trials this spring and is expected to be introduced globally in 2012.

Source: Diesel Progress