Hydrogen Motor

Hy-Wire

Hy-Wire 2002

Named for its combination of hydrogen fuel cell and drive-by-wire technology, the Hy-wire incorporates the features envisioned in the AUTOnomy concept vehicle. All of its propulsion and control systems are contained within an 11-inch-thick skateboard-like chassis, maximizing the interior space for five occupants and their cargo.

Design

Due to hydrogen fuel cell drive system used by the Hy-wire the conventional car layout has been revamped. Without the need for a conventional engine block and transmission system coupled to the steering column and pedals through mechanical linkage the car's power system and single electric motor are built into a flat skateboard configuration. This serves to lower the car's center of gravity but more importantly to standardize vehicle drive train systems. Because all propulsion and energy storage systems are housed in the skateboard designers are free to arrange the passenger compartment however they see fit. This allows for highly flexible vehicle configurations such as a 4 door sedan, mini van, or even a small bus to be placed on the same drive system, with the only difference being the shape of the car's upper body and the location of seats. The skateboard itself contains crumple zones similar to those in conventional automobiles.

Driver interface

The car's drive-by-wire system coupled with cameras instead of mirrors and multiple LCD displays for feedback to the driver theoretically allows the driver's seat to be located anywhere; however, most current designs still favor the driver in front of or beside the other passengers for maximum visibility. The digital coupling of the controls to the drive system means neither the driver's seat nor the steering and throttle controls must be fixed in place. For example, the 2003 concept model has a single control interface that can be operated from either the right or left front seats, and the 2004 concept design places the two front seats on a rotating platform which allows the driver and passenger seats to be swapped or the driver to sit in front of the passenger for greater flexibility.

Powerplant

The Hy-wire is powered by a fuel cell capable of producing 94 kilowatts of power continuously without refueling on a saltwater solution and up to 129 kilowatts for short periods.[4] The fuel cell itself is supplied with hydrogen from 3 tanks of compressed hydrogen located in the skateboard holding 2 kg (4 lb), but future models may hold larger capacities, yielding increased driving range. With its three-phase electric motor the ~4000 lb (1814 kg) vehicle has a top speed of 100 mph (160 km/h).

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Vehicle:

Fuel cell and by-wire technology; front-wheel drive, new luxury sedan

Seating capacity:

5

Fuel storage system:

Three cylindrical high-pressure tanks of carbon composite material, mounted in the middle of the skateboard chassis
Length/diameter: 1,161/241 mm (45.7/9.5 inches)
Total capacity: 2 kg (4.4 pounds)
Total weight: 75 kg (165 pounds)

Fuel cell stack:

200 single fuel cells; connected in a series
Voltage:125-200 Volt
Length/width/height:472/251/496 mm
Pressure:1.5-2.7 bars
Continuous rating: 94 kW, peak of 129 kW
Power density: 1.60 kW/l, 0.94 kW/kg

Electrical traction
system:

Three-phase asynchronous electric motor with integrated power electronics and planetary gear
Operating voltage: 250-380 Volt
Maximum rating: 60 kW
Maximum torque: 215 Nm (159 lb-ft)
Maximum rpm: 12,000
Transmission ratio: 8.67:1
Total weight: 92 kg (203 pounds)

Skateboard chassis:

Length/width/height: 4,357/1,670/ 279 mm (171.5/65.7/11 inches - taller in the back)
Aluminum frame

Body:

Steel and fiberglass
Length: 5 meters (195 inches)

Vehicle size and weight:

Mass: 1,900 kg (4,185 pounds)
Wheel base: 3,114 mm (122.6 inches)