It was an exciting time for electric cars in the early 1990s. GM’s Impact concept was unveiled at the 1990 LA Auto Show, with the Tokyo Motor Show exhibiting many electric concepts as well. Among them was Tokyo R&D’s IZA electric car. Green Car Journal editors attending the Tokyo show found the IZA a fascinating counterpoint to the Impact at the time. If you’re interested in the beginnings of the modern electric vehicle field as we know it today, then there’s no better place to start than diving into Green Car Journal’s early issues with us. Here, we present the following article from the Green Car Journal archives, as it was originally published in March 1992.
Excerpted from March 1992 Issue: Sleek and slippery like GM’s Impact prototype, the IZA easily garners attention from anyone in its vicinity. It did this consistently at the Tokyo Motor Show. GCJ editors there found it to be among the most formidable EV research efforts showcased by Japanese interests.
The IZA is principally sponsored by Tokyo Electric Power Company (TEPCO) as an “experimental study vehicle.” The company began with a clean slate in 1988, commissioning Tokyo R&D, Ltd. to design the body and Meidensha Corp. to handle motor and inverter development. Technical guidance was provided by the EV Research Organization and Professor Yoichi Kaya of the University of Tokyo.
Some interesting comparisons can be drawn with GM’s Impact prototype. Both aerodynamic EVs achieve an impressive 0.19 coefficient of drag, each relying heavily on wind tunnel design and high-tech construction techniques. The Impact uses a fiberglass-reinforced monocoque arrangement, while the IZA integrates a carbon fiber reinforced plastic body over an aluminum chassis. Height and width dimensions are nearly identical. Certain specifications vary widely since the Impact is a two-seater and the IZA a 2+2. The IZA’s body and wheelbase are longer (an additional 29 and 13 inches), and curb weight heftier by 1268 pounds.
One of the most interesting features found on the IZA is its brand of motivation. Meidensha Corp. integrated a direct-drive system with each wheel connected to a DC brushless motor. Japan Storage Battery Company installed 24 nickel-cadmium (NiCad) batteries to create a 288-volt, 28.8 kWh powerpack for the four-wheel drive powertrain. This battery system weighs in at a substantial 1170 pounds, one-third of the car’s overall weight. Bridgestone Ecology 205/50R17 low-rolling resistance radials were mounted to modulate road friction and unspring weight.
Endurance testing on Meidensha’s chassis dynamometer in October 1991 indicated a 343-mile range at a steady speed of 25 mph, and a 169-mile range at 62 mph. Indicated top speed is 110 mph, the same as that of the Impact.
The car incorporates a variety of comfort and convenience features including power steering, power windows, and power-assisted brakes. An inverter-controlled heat pump air conditioning system is also used. Its interior is simple but stylish, with a smoothly contoured dashboard placing all controls easily within reach. Minimal instrumentation is housed within a very small rounded cluster directly in front of the driver.
TEPCO sources advise GCJ that additional IZA models are not planned at this time. In the meantime, the company is conduction further tests and working to secure a license plate for highway operation.
The Nissan LEAF benefits from early electrics like the circa-1998 Nissan Altra EV, the first model to use lithium-ion batteries. The Altra EV was one of many electrics explored during Nissan’s decades-long electric vehicle development program, including the Future Electric Vehicle (FEV), FEV II, Prairie Joy EV, Nissan Hypermini, Altra EV, and of course the LEAF. To lend insight into the early years of Nissan’s electric vehicle development, we present the following article from the Green Car Journal archives, as it was originally published in June 1998.
Excerpted from June 1998 Issue: The Nissan Altra EV, an electrified iteration of the all-new R’nessa minivan, an internal combustion model sold only in Japan, created quite a stir at its official North American debut at this year’s 1998 Greater L.A Auto Show.
The reason? It’s the first time any production electric vehicle has used lithium-ion batteries, scaled-up versions of the batteries found in the highest-end notebook computers and video cameras. Just as lithium-ion allows these portable devices to operate longer on battery power, this advanced battery technology also provides an EV with a longer single charge driving range – 120 miles in the case of this minivan.
It could have been more. Nissan chose to go with a minivan because of its universal appeal and functionality. However, there was a desire on the part of some Nissan executives to go with a smaller, lighter EV because the Li-ion batteries could have provided a stunning 200 mile single-charge driving range in a smaller platform. Instead, the automaker chose a platform that weighs in at just over 100 pounds more than Honda’s EV Plus.
The Altra EV’s Li-ion battery pack consists of 12 modules of eight cells connected in series, or a total of 96 cells, each measuring 2.6″ in diameter and 16″ in length. A Hughes-type inductive charging system, the same as GM’s EV1, is used on the Altra EV. A full charge from empty takes about five hours.
The decision to integrate Sony Li-ion batteries represents substantial vision on the part of Nissan, and also, it seems, an ability to absorb significant short term losses. While Nissan sources will not officially comment on the actual cost of the Li-ion battery pack, insiders say that early versions cost somewhere between $50,000 to $70,000 each. Obviously, these costs will drop dramatically and quickly as the technology advances and greater numbers of these batteries are produced. In the meantime, high costs for early EVs used in limited demonstrations are to be expected.
Power is provided by a 83 horsepower permanent magnet synchronous motor and a 32-bit high-speed RISC motor controller processor. The motor features a compact design that weighs just 85 pounds. This electric powertrain achieves a high overall energy efficiency lf approximately 90 percent under ordinary driving conditions.
Green Car Journal editors had the opportunity to put the Altra EV through its paces at the automaker’s Tochigi test track in Japan. This test drive proved the Altra EV to be quite a capable performer, with good acceleration and handling characteristics. In fact, no apparent shortcomings were detected other than some slight gear whine, not a surprising occurrence since this vehicle’s operation is otherwise silent, with no internal combustion engine or exhaust noise to mask normal mechanical sounds.
Inside, an innovative, titanium-colored digital instrument panel displays performance and charge status that was easy to read during our test drive. Comfortable seating for four is provided with front and mid-section bucket seats. A good amount of cargo area is provided at the rear.
This four-place seating configuration, rather than the six- or seven-place seating found in conventional minivans, is simply a concession to the need to keep total gross vehicle weight within certain limits to ensure optimum driving range. Everything, from vehicle weight to aerodynamics to rolling resistance, is crucial in electric vehicles that carry a very finite amount of energy onboard. This is an especially important consideration since the Altra EV carries an 800 pound battery pack mounted beneath the floorboard.
Nissan is bringing 30 Altra EVs to the U.S. for testing this year, mostly within its own employee fleet and in the fleets of several electric utilities. Nissan sources tell Green Car Journal that delivery of the first 15 Altra EVs from Japan is slightly behind schedule, but they are expected imminently. After the initial 30 examples arrive, an additional 90 Altra EVs are scheduled to be brought to the U.S. for placement with fleets by 2000.
Of course, the Altra EV represents but one highly visible part of this automaker’s electric vehicle program. By all accounts there’s also a hybrid electric variant coming, possibly based on the efficient Nissan Avenir developmental hybrid platform that Green Car Journal editors had the opportunity to test drive at the automaker’s Tochigi track in late 1997.
While this hybrid vehicle was clearly still in the development stage – much of the interior was devoted to battery placement and instrumentation – it was far enough along to prove the viability of Nissan’s hybrid work.
Tadao Takei, Nissan’s executive vice president, has been quoted as predicting a January 1999 launch of a Nissan hybrid EV in Japan. This follows the late-1998 launch of Toyota’s Prius hybrid EV in the Japanese market. Takei expressed doubt that Nissan would reach the current 3,000 unit-per-month production of the Prius, which was recently ramped up to meet unexpectedly high demand for the Toyota hybrid.
Still, the fact that Nissan is moving forward with a hybrid launch signals an important commitment to what promises to be an exciting and growing segment of the auto industry.
POWERTRAIN
Type: Neodymium permanent magnet DC electric motor
Dimensions: 8.11 inches diameter x 12.01 inches length
Power: 83 hp (162 kW)
Maximum Torque: 17 ft-lbs
Maximum RPM: 13,000
Transmission: Transaxle type with 2-stage planetary gear set
Controller: 216-400 volt input range, Vector controller
Drive Configuration: Front-mounted motor, front-wheel drive
BATTERY
Type: Lithium-ion
Capacity (AH/Hour): 94/3
Nominal Voltage (V/Set): 345
Number of modules: 12
CHARGING SYSTEM
Charger Type: Inductive
Charging Time: 5 hours
BODY/CHASSIS/SUSPENSION
Body Type: Unibody construction
Front Suspension: MacPherson strut with coil springs and stabilizer bar
Rear Suspension: Rear multi-link beam with coil springs
STEERING
Steering Type: Power-assisted electric oil pump
Turning Circle (ft.): 36.2
Turns (lock-to-lock): 4.11
BRAKING SYSTEM
Brake System Type: Electric assist regenerative antilock braking
Front: Ventilated disc brakes
Rear: Drum rear brakes
Input Voltage: 12
Motor Type: DC brush
WHEELS & TIRES
Wheels: 5-spoke aluminum alloy
Size: 15-inch
Tire Type: Low rolling friction all-season radial
Tire Size: 205/65R15
DIMENSIONS
Overall Length: 191.7 inches
Overall Width: 69.5 inches
Overall Height: 66.8 inches
Wheelbase: 110.2 inches
Tread Width (front/rear): 60.4/59.8 inches
Min. Ground Clearance: 5.51 inches
Coefficient of Drag (Cd): 0.36
WEIGHTS & CAPACITIES
Seating Capacity: 4
Curb Weight: 3,749Ibs.
Weight Distribution: 56/44 front/rear
GVWR: 4.579 .lbs.
Cargo Capacity: 221 1bs.
Maximum Payload: 820 1bs.
FUEL ECONOMY
Hwy/City: 304/342 watt hours/mile
PERFORMANCE
Vehicle Range: 120 miles
Maximum Speed: 75 mph (governed)