Enova Systems (earlier post) has introduced a new set of series hybrid drive systems for heavy-duty, urban transit and delivery vehicles. Series hybrid vehicle powertrains typically consist of an electric motor, energy storage (currently usually a battery) and management, and a small internal combustion engine (ICE) to generate electricity. (See diagram at right.)
The new Enova “Hybrid Power” series hybrid drive systems deliver 120 kW (161 hp) and 240 kW (322 hp) of propulsion power with 650 Nm (480 lb-ft) and 1,300 Nm (960 lb-ft) of torque respectively at 1,800 rpm. The systems include the drive motors, all electric accessories, energy management, energy storage, and ICE generator. The hybrid systems can also be configured to generate AC electricity for other applications such as plug-in power tools.
The 60 kilowatt diesel generator, the power component within the system, uses a 2.5-liter turbo diesel, and is the first commercial product stemming from the Hyundai-Enova Innovative Technology Center (HE-ITC)—a joint venture between Hyundai Heavy Industries and Enova Systems (earlier post).
The driver can switch off the generator when silent operation is preferred. In an urban transit or urban delivery cycle, Enova’s series hybrid drive systems are expected to deliver 40–60% in fuel savings, reduced brake maintenance costs, and significant reduction in NOx, CO, and PM emissions when compared with conventional internal combustion diesel powered vehicles in a similar environment.