Transcript Slide 1
Hybrid-Electric HMMWV: Platform for Advanced Lead Acid Battery Testing Problem Definition Thermal Management This project focuses on converting a military HMMWV into a hybridelectric vehicle. The HMMWV will serve as a test bed for the power-dense lead acid batteries that are being developed by Dr. Dean Edwards. We will concentrate on the design of the battery enclosure and thermal management system and make recommendations to future teams based on our results. Implemented using the concepts presented in a design prepared by Aerovironrnent for a similar military vehicle, the J-TEV. Deliverables 1. Integrate the diesel generator for recharging the battery pack 2. Incorporate an electric propulsion system into the diesel HMMWV. 3. Design and build a battery enclosure 4. Implement a thermal management system to keep the temperature in the battery box between 80-120˚F. 5. Design and implement a data acquisition system that can be used to collect, display and store the temperature and voltage of the batteries during use. • Baffling was added for uniform flow distribution • Concentrated on the cooling system Data Acquisition Generator Implemented with National Instruments PXI based chassis system. • Volt/ Amp Alternator • Charges the HMMWV while it is moving • 550 hp diesel engine • Programmed using LabVIEW® • Controlled with a UQM control unit • Started using a circuit designed and built by the team • Receives and displays 40 thermal readings • Receives and displays 34 voltage readings • Data retrieval via USB connection • User Interface through a touch screen Electric Propulsion Unit Integration System Diagram • Implemented with forced air system with three point flow control • Research mode for data collection and display, see Fig4. • Driver mode for normal operation, see Fig5. • 150kW electric propulsion system and motor in series configuration • Versatile and reconfigurable system where interchangeable PXI cards can be purchased to expand the capabilities of the system.. • Calculated gear reduction ration for optimal performance • 200 hp electric motor • Used MatLAB® code developed by the Future Truck Team • Top speed for good low end torque is 30 mph. Results are in Fig1. • Design for mounting of gear reduction and electric motor can be found in Fig2. Faculty Advisor Fig1:Simulated Performance Fig4: Research Mode Fig2: Motor Mounting Design Our Operation Point Dr. Herb Hess Fig5: Driver Mode Team Members Battery Enclosure Design Surrogate Batteries • Located on the bed of the vehicle for easy maintenance • Slides on tracks for access to recessed electric compartments. Team Members Pictured From Left to Right: Linnea Anderson, Albert Whetstone, Daniel George Bryan Blakey, Chad Schierman, Matt Braley, Slade Klien, Matt Shaw Foam Insulation Tracks Fans and Baffles • Add another propulsion unit and/ or • Adapt the thermal management a transmission to improve its system to the advanced lead performance acid batteries • Add 4 wheel drive capability • Explore heating options for the thermal management design • Batteries are bolted to the frame and are surrounded with insulation • See Fig3 for our design Future Work Fig3: Battery Enclosure • Integrate ground fault interruption system • Incorporate the battery monitoring system • Test vehicle as portable generation device • Develop battery monitoring and control