Hybrid improvement

BAE Systems has unveiled an improved model of its hybrid propulsion system at the American Public Transportation Association’s Annual Meeting and Exposition in San Diego.

The company’s latest HybriDrive system is based on its series diesel-electric hybrid technology. The new model is said to have simpler mechanics, reduced maintenance costs and the capacity to perform on multiple bus platforms.

The system can be adapted to various bus models by arranging the diesel engine and generator either inline or transversely. In addition, it has the capacity to generate up to 27kW of power for electrically operated systems such as air conditioning and power steering.

By combining the starter and generator to remove starter motor and flywheel, the system is simpler and lighter. Buses equipped with the new model will use a lithium-ion energy storage system to increase battery life and further reduce vehicle weight.

The absence of a mechanical transmission in the new design, traditionally a major maintenance item, has reduced costs and improved reliability.