2010 Lexus HS 250h - World's First Dedicated Luxury Hybrid

In the first of its two world-wide debuts, Lexus today revealed the 2010 HS 250h, the world's first dedicated luxury hybrid vehicle, at the North American International Auto Show.

The HS 250h will be Lexus' fourth hybrid and is expected to offer the best combined fuel mileage of any luxury vehicle in the U.S. It also will be the first Lexus to utilize carbon-neutral Ecological Plastic materials in a new futuristic cockpit and interior design, helping the car to be 85% recyclable.

Lexus expects its 187 horsepower engine to offer the best MPG available in the United States while running on regular unleaded gasoline. The HS 250 h contains standard Lexus entry level luxury features including a noise reduced cabin, navigation system with voice recognition technology and heads-up display. The automaker believes that gas-electric hybrid systems will be its core technology in the years to come and plans to introduce 10 new hybrids over the next ten years.



A welcomed addition to Lexus' entry-luxury sedan lineup, the HS 250h fits nicely between the IS luxury sport sedan and the ES luxury sedan. Research has shown that more than 60 percent of entry-luxury car buyers would have considered a hybrid if available, and the HS will provide these consumers with a viable purchase option.

Equipped with Lexus' first four-cylinder gas engine, the 2.4-liter Atkinson-cycle powerplant is part of the latest Lexus Hybrid Drive System, which generates 187 total system horsepower. The highly efficient Atkinson- cycle engine, made possible by the Variable Valve Timing with intelligence (VVT-i) system, allows the expansion/power stroke to be longer than the compression stroke so that combustion energy can be more effectively used for production of engine power.



The HS 250h sedan's expected fuel efficiency will be more than 30-percent better than the most fuel-efficient model currently in the Lexus lineup, while earning a SULEV emissions rating utilizing regular 87- octane gasoline. Among the technologies adopted in the 2.4-liter four- cylinder engine are cooling piston oil jets; an optimized balance shaft rate for improved noise, vibration and harshness (NVH) characteristics; and a hot- air venting system mounted behind the radiator.

Like the all-new 2010 RX 450h hybrid utility vehicle that made its debut in November, the HS 250h will include a new system designed to improve efficiency. The exhaust heat recovery system reduces engine warm-up time, thus allowing it to stop earlier, more often, and for longer periods. A windshield with infrared-ray (IR) reduction properties, which helps keep the interior more cool, has been adopted in order to decrease the amount of air conditioning needed to lower the cabin temperature. In addition to the exhaust heat recovery system and the IR windshield, available power-saving LED headlamps also contribute to improved fuel efficiency and emissions.



The all-new HS 250h sedan's 0.27 drag coefficient (Cd) makes it among the most aerodynamic in its class. Airflow management over the exterior, below the under floor and through the air passages was extensively examined. A unique gull-wing-shaped roof-panel design reduces mass and overall vehicle height, thus reducing drag and improving fuel efficiency. The front spoiler, rear spoiler, rear under spoiler, and diffuser fins all reduce turbulence. Smooth A-pillar shape and the optimized angle and curvature of the bumper side panels also reduce wake turbulence, as does the increased taper of the fender side panels. The under-floor covers have been optimally positioned for reduced drag, while airflow restriction in the engine compartment has been lowered by optimizing the air-duct profiles around the radiator.

As is appropriate for the first dedicated luxury hybrid vehicle, the HS 250h includes proactive adoption of plant-based, carbon-neutral "ecological plastics" or bio-plastics in specific interior areas. Ecological plastic emits less carbon dioxide during a product's lifecycle than plastic made solely from petroleum. Among the areas of utilization will be an industry- first use in luggage-trim upholstery. Other areas are the cowl-side trim, door scuff plate, tool box area, floor-finish plate, seat cushions, and the package tray behind the rear seats. Overall, approximately 30-percent of the interior and luggage area is covered with ecological plastic. Over the estimated lifecycle of the vehicle, the HS 250h will have approximately 20- percent fewer carbon-dioxide emissions as a result of utilizing the Ecological Plastic trim pieces.



Like all Lexus hybrid models, significant time was spent in developing the HS 250h with optimized NVH characteristics. Dynamic dampers at each engine- mounting point reduce noise and vibration, resonators improve intake air noise, and optimized exhaust flow reduces exhaust sound. Special coatings dampen both engine and road noise, while improved seals around doors, hood and fenders reduce wind-noise penetration into the cabin. Vibration has been reduced by improving the shape and thickness of the suspension-mounting points. In addition, power-window speed controllers have been adopted from the LS luxury sedan, which insure a slower, soft closing rate.

A class-leading 10 airbags will be standard on the all-new HS 250h as well as active front head rests, which help passengers in case of certain types of rear-end accidents. The HS also will feature Lexus' Vehicle Stability Control (VSC) system and optional Pre-Collision System with Dynamic Radar Cruise Control.

An available wide-view front monitor helps the driver to check hard-to-see areas. Using a camera mounted in the front grille, the monitor provides a 190-degree front view on the Navigation screen with the push of a button on the steering wheel.

The HS 250h will also offer Lexus' next generation telematics systems, Lexus Enform and Safety Connect. Safety Connect will provide automatic collision notification, stolen vehicle location, 24/7 emergency and roadside assistance.

Lexus Enform's Destination Assist features operators who will help drivers look up points of interest such as shopping centers or other business locations like Zagat-rated restaurants, and then wirelessly send directions directly to the vehicle's navigation system.