Speaking of range, Hyundai claims the Nexo (in base “Blue” trim) is the world’s longest-range EV at 380 miles (Honda claims a 366-mile range for the Clarity FCEV; Tesla 335 miles for its 100D sedan), and unlike a battery electric vehicle (BEV), it can be refueled in five minutes. We spent a day in the Los Angeles area piloting the Nexo in normal workday traffic and could not help feeling like we were driving around in (a very quiet) future.
Rolling power plantThe 2019 Hyundai Nexo is Hyundai’s second-generation FCEV and also its second SUV, the first being the Tucson FCEV introduced in 2013. Compared to the Tucson FCEV, the Nexo’s revamped FC powertrain is 14% lighter and takes up 18% less volume thanks to better module integration. Packaging is also improved, with FC stack hardware contained beneath the Nexo’s hood and the high-voltage battery (along with a separate 12-volt lithium-ion battery for accessory power) shuttled back below the rear load floor.
Total system power is 135 kW, of which 95 kW emanates from the FC stack and 40 kW from the 1.56-kW·h, 240-volt lithium-ion polymer battery. Hyundai claims a system efficiency of 60.4%, a 5.1% improvement from the Tucson FCEV, with power density improved 50% to 3.1 kW/L. The stack powers a 120 kW (161 hp) permanent-magnet motor (the Tucson’s motor was AC induction) that produces 395 N·m (291 lb·ft) routed to the front wheels through a single-speed reduction gear (7.981:1).
The dedicated vehicle architecture and bespoke independent rear suspension permits the Nexo to use three 52-L (13.7 gal) hydrogen storage tanks (right) compared to the torsion-beam Tucson FCEV’s two alternate-sized tanks, netting a total capacity of 156 L (41.2 gal). The result is increased rear cargo volume (5.8 ft3 more than Tucson FCEV) even with the battery relocated beneath the trunk’s floor. The 700-bar (10,000-psi) tanks are also more efficient with an improved weight ratio – up from the Tucson FCEV’s 5.6 kg to the Nexo’s 6.3 kg.
Compared to the Tucson FCEV, Hyundai claims the Nexo produces an additional 70 lb·ft, accelerates from 0-60 mph 20% faster (9.5 s) and has 40% more range. The base Nexo Blue model has an estimated driving range of 380 miles and an EPA city/hwy/combined MPGe rating of 65/58/61, with the Limited trim’s range estimated at 354 miles (59/54/57 MPGe) due to additional content and increased rolling resistance from its standard 19-inch wheels/tires.
Hyundai claims the Nexo has an industry-leading 30-second cold-start capability. Other improvements to its 2nd-gen system reduce refueling times, and a more efficient air-supply system improves performance at higher altitudes. Side benefits are the stack’s ability to filter particulate matter and fine dust – essentially cleaning the atmosphere as you drive – and potential future applications where a docked vehicle could provide both electricity and water to a home.
Conventional but dedicated platformThe 2019 Hyundai Nexo uses a new, dedicated platform designed around a fuel-cell architecture, and employs the latest advanced high-strength steels to improve rigidity and reduce weight. Hyundai claims a base curb weight of 3,990 lb (1,810 kg) for the base Blue trim on a 109.8-in wheelbase, which is almost 6 inches longer than the Tucson FCEV. Dimensions that also expanded in relation to the Tucson FCEV include width (+1.5 in) and length (+10.3 in) while the more stylish roofline drops 1.0 in.
The Nexo features a fully independent suspension (McPherson strut front; multi-link rear), electric-motor-driven power steering, four-wheel disc brakes, and alloy wheels in standard 17-inch or optional 19-inch diameters. Beyond the sculpted wheels, aero-specific features include a subtle D-pillar air tunnel, front wheel air curtains, hidden front wipers and party-trick door handles that disappear flush into the body, all contributing to a 0.32 Cd.
As part of its carbon-reducing mission, the Nexo applies bio materials to 47 different parts, cutting 26 lb. of CO2 during the manufacturing process, and ecological materials used in construction include soybean-oil based polyurethane paint, bamboo-thread-based bio fabric, vegan-based leatherette seating surfaces and bio-plastic and carpet extracted from sugar cane.
Loaded with techAs a tech flagship, the Nexo is loaded with driver assist/warning features from the Hyundai portfolio, including forward collision, lane following and rear cross-traffic assists, combined with blind-spot and surround-view monitors. A remote parking system will autonomously park or retrieve the Nexo from either a parallel or perpendicular parking space with or without a driver in the vehicle, and can also back the Nexo into a parking spot.
A notably expansive 12.3-inch touchscreen handles audio and navigation functions, while the driver gets a 7-inch display for the gauge cluster. Transmission control is via a push-button shift-by-wire design, opening up center-console space for the Qi wireless-charging pad. Apple CarPlay and Android Auto support are standard, and the Nexo features two available audio systems from Samsung-owned Harman, including a 440-watt, eight-channel Krell system, a name which should resonate with audiophiles
The Nexo’s remote-start function includes a Hyundai-first remote heated and cooled seats, and other connected features via Hyundai’s Blue Link system include a hydrogen fuel-station locator, real-time range and fuel level, and a monthly health report with on-demand diagnostics of the hydrogen system.
First drive with a FC fellowAutomotive Engineering’s time driving the Nexo at the launch event was exceedingly fortunate to include Dr. Bo Ki Hong as a passenger. Based at the Mabuk Technical Center in Korea, Dr. Hong is the fuel-cell research fellow for Hyundai Motor’s R&D division, and he imparted several key points in FC development during our drive, including balance and the newest scale/cost challenge.
According to Dr. Hong, the key engineering challenge with the Nexo was finding the proper balance between the stack and the high-voltage battery in terms of performance, efficiency and drivability. These are new knobs to turn from an engineering perspective, and Dr. Hong noted it’s the recent improvements in high-voltage battery technology that makes FC vehicles viable – with the battery acting as a crucial, on-demand storage device for energy produced by the stack and (more commonly) regenerative braking.
In terms of FC development, Dr. Hong said that he felt the industry has reached a third distinctive hurdle, with the first having been getting enough power from the FC stacks (10 kW was a challenge when development first began two decades ago he noted, but now they’re netting 10 times that amount). The second challenge was packaging, but he said he felt that has been solved with FC components housed beneath a conventional vehicle’s hood.
According to Dr. Hong, the next real challenge is cost. He noted how crucial the suppliers were who committed resources to help make a vehicle like the Nexo possible, but scale will now be key to reducing costs. According to Dr. Hong, Hyundai will seek to scale up the learnings from the Nexo for bus and truck applications, and he also mentioned the partnership with Audi. Announced in June, it permits the two companies access to each other’s intellectual property and to share components, which should help bring FCEVs to mass production volume more effectively.
A loaded fuel-cell offeringOn the crowded and deteriorating roads around Los Angeles the Nexo proved an exceedingly quiet vehicle even for an EV, one well suited for a fuel-cell discussion. Both the windshield and side glass are multi-layer laminates that effectively attenuate outside sounds, and the isolating suspension tune for the 4,000-pound Nexo feels skewed towards pillowy. The Nexo is free of what another program attendee labeled as the “haunted house” noises of other FC offerings, which arise from supporting systems (intake pumps, etc.), as according to Dr. Hong, the FC process itself is silent.
The sense of width amplified by the wide center console and light-colored interior fabrics make the Nexo feel airy and spacious, which combine with the massive display screen to give the Nexo a decidedly premium feel. The near silent electric thrust was a calm antidote to L.A. traffic, and the Nexo is truly serene place in which to commute. Were it not for the lack of noise and pleasing electric torque, you wouldn’t know you were in anything but nicely appointed and softly sprung SUV.
Where the Tucson FCEV was lease only, the Nexo will be leased and sold, and available wherever there are “enough” hydrogen refueling stations. The Nexo will be built on Hyundai’s dedicated FCEV production line in Ulsan, Korea, and pricing had yet to be announced as of early November. Hyundai said the Nexo will be available in Southern California before the end of 2018, with Northern California availability planned for early 2019. Continue reading »