Developing the Next Generation of Hybrid Vehicles

A new generation of hybrid drive train technologies is being advanced thanks to a strategic public/private working group of key stakeholders in Michigan led by NextEnergy. Unlike the more familiar hybrid electric drive trains, these new technologies use hydraulic power systems in tandem with traditional engines to harness the energy lost in braking and regenerate it for acceleration.

NextEnergy’s Hydraulic Hybrids Working Group is coordinating the work of key industry stakeholders – including suppliers, manufacturing companies, universities and other research organizations – promoting and accelerating the commercialization and adoption of these new systems and lining up supply chains for their production.

The potential of hydraulic hybrid drive trains has been recognized for generations, particularly for use in specialty vehicles like garbage trucks and delivery vehicles. Hydraulic components, such as pumps and accumulators, enable recovery and re-use of energy normally lost during the act of braking.

The technology also reduces idling and engine operation, resulting in significant improvement to fuel economy and reduced pollution from emissions.

Today’s higher fuel costs and increased environmental concerns are generating new interest in this versatile technology, particularly for operators of heavy duty fleets. If a vehicle fleet engages in significant stop-and-go activity – such as for package, beverage, or food delivery, waste removal, shuttle service, and other light or heavy truck activity – hydraulic hybrid technology makes clean, efficient use of the fuel burned.

In laboratory tests, this technology has achieved 60-70% improvement in fuel economy with associated reductions in carbon dioxide emissions. These systems are now being installed by working group members into a variety of fleet applications for further testing, validation and demonstration.

The Hydraulic Hybrids Working Group continues to build synergy and collaboration among the key stakeholders and other interested parties in this technology.