Diesel Electric South Pole Expedition Hummer H1
960 LB-FT At Zero RPM
We saw this unreal diesel-electric H1 Hummer on Mattracks at the 2010 SEMA show. The centerpiece is its wild drivetrain, consisting of a 3.2L Steyr Monoblock engine (Military Power, Dec. ’08) hooked to an electric motor acting as a generator. This generator then drives twin water-cooled 348-volt electric motors that are attached to the vehicle’s front and rear differentials. Electric motors start making peak torque almost immediately, hence the 960 lb-ft at zero rpm.
While this diesel-electric Hummer’s 40-mph top speed may not sound all that impressive, it is fitting for the design of the vehicle, which is said to be capable of traveling all the way down to the frozen tundra of the South Pole. In the snow and ice, flotation, getting unstuck, durability, and range are all utterly important, and that’s where the diesel-electric platform shines.
1. four-Wheel Drive: 200hp electric motors are coupled with the Hummer’s front and rear axles. The factory H1 differentials were rotated 180 degrees so that the pinion yokes now point away from the center of the vehicle and spline directly into each motor.
2. 3.2L Steyr Monoblock turbodiesel engine: The six-cylinder Steyr engine is a monoblock design, meaning the head and block are cast as one piece, eliminating the need for a head gasket. The low-emissions engine also has a special limp mode that allows it to run even in the event of a complete electronic failure.
3. Electrovaya Dual eight-module lithium HEV packs with cold weather kit: If you’ve ever had trouble starting your vehicle on a cold morning, imagine relying on almost 30 times the voltage to get you moving in sub-zero weather. This is why trick SuperPolymer lithium-ion batteries, made by Electrovaya, are used to power this extended-range electric vehicle.
4. Three UQM 150kw (200hp) electric motors: One motor acts as a generator and is coupled to the diesel engine, while the other two drive the front and rear axles. During cruising conditions, the generator is all that is needed to power the drive motors, but when extra power is required, the batteries can be tapped, and the twin UQM motors will unleash 400 hp and 960 lb-ft of torque.
5. Mattracks Track drive system: Capable of handling any terrain while exerting only 4 to 5 psi of pressure on the ground. A very light pressure drive system is a must-have when traveling on ice or snow. They cost about $10,000 per corner.