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2010 Lexus HS 250h Overview Part III: Design

Interior: Design for Innovation
The interior of the HS 250h was designed to communicate the high level of innovation inherent in the car with the craftsmanship expected from Lexus products. Because of the high frequency of interaction with it, Lexus’ exclusive Remote Touch navigation system controller is a focal point of the interior design.

The center stack sweeps rearward to the Remote Touch which naturally meets the driver’s hand atop a “floating” form over the center console. Switches and displays are neatly arranged for ease of operation and free of visual complexity, courtesy of Remote Touch.

Leather-trimmed seats are standard and special soft touch stitched details on the center stack and instrument hood provide an extra premium touch in the cabin. Interior trim colors include black leather, new light gray leather, parchment leather, and a distinctive black/light gray two-tone leather trim. All include standard high-finish trim or available brown walnut wood trim. Front door trim that mirrors the shape of the center stack and armrest provide a comfortable symmetry. And the steering wheel center pad appears to float on the wheel, surrounded by control switches that mimic the design and color of those on the center stack.

Body Design and Packaging
Efficiency was a priority in the HS 250h body design, with careful packaging of people and components to maximize space and special attention to aerodynamics to reduce drag. But the HS 250h is also a Lexus luxury car and its designers were very intent on creating a fresh, appealing design befitting the brand that is also hybrid-distinct.

Body designers looked to the Lexus L-Finesse design language to create a new shape for their first dedicated hybrid. The silhouette displays a smoothly flowing line from front to rear; the C-pillar has a unique arrowhead shape; the grille is set low in the front with no openings to facilitate smooth airflow over the hood; there is an air inlet directly below the grille to cool the hybrid system and a larger one lower in the fascia to cool the engine and radiator. The standard projector-beam headlamps provide a focused look, while innovative, efficient LED headlamps are available; and rear-combination lamps are clear with blue-accented frames that intentionally signal “hybrid.”

Striving to create a sleek and aerodynamic shape with a roomy cabin while containing the physical footprint of the car and packaging the hybrid system components, HS 250h designers had their work cut out for them. To accomplish their goals, they used a somewhat taller profile and more forward A-pillar location than used in conventional sedans. This allowed a higher seating position for both front and rear passengers, providing improved passenger vision and easier egress/ingress, while also creating a better location for the batteries. The battery components, including the high-voltage battery pack, auxiliary battery and battery-connected devices, were carefully packaged to take advantage of this layout, resulting in a spacious cabin and surprisingly large trunk space.

The HS250h will offer 10 premium Lexus exterior colors: Matador Red Mica, Tungsten Pearl, Smoky Granite Mica, Obsidian, Golden Almond Metallic, Black Sapphire Pearl, Starfire Pearl, and three hybrid exclusive colors – Black Opal Mica, Aurora White Pearl and Silver Opal Mica, which debuts on the HS.

2010 Lexus HS 250h – Hi-res. Images

2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h
2010 Lexus HS 250h


Dynamics
Nimble handling, excellent body control, smooth ride and low noise in the HS 250h begin with a stiff body structure. The HS body is designed with superior stiffness overall with added focus in strategically-located areas that have the greatest effect on ride, handling and noise.

Designed to balance handling, ride and NVH at high levels, the HS uses a rigid and compact MacPherson strut front suspension. The system employs lateral force-reducing coil springs, a 24-mm diameter stabilizer bar plus large diameter pistons and rebound springs in the shock absorbers to help provide superior ride control. The steering rack is directly mounted (no rubber bushings) to create an unfiltered connection between it and the suspension members to help accurately communicate to the driver what is happening where the rubber meets the road.

The double-wishbone rear suspension used in the HS also balances performance and comfort and is important to its overall handling. Its compact design uses low-mount coil springs that help improve cargo space. As in the front suspension, rebound springs are used to aid both handling and ride, and all mountings and bushings are optimized to help provide an excellent combination of ride, handling and low noise.

Standard 17-inch aluminum alloy wheels on the HS 250h are shod with P215/55 R17 all-season tire. Available 18-inch aluminum alloy wheels are equipped with larger P225/45 R18 all-season tires. All wheels feature the direct-type Tire Pressure Monitoring System (TPMS).

As one of the leading users of electric power steering (EPS) in its vehicles, Lexus’ experience continues to improve the breed. For the HS 250h, a column mounted EPS system has been developed to work with both manual and available power tilt-telescoping steering columns. The vehicle-speed sensitive steering has been optimized to provide ideal steering feel at any speed. Inertia compensation control, friction feedback and recovery control assist in tailoring the steering feel and effort. The HS EPS system also improves fuel economy by eliminating the need for a belt driven-pump and its associated belts and fluid, further benefiting the environment.

Like all Lexus vehicles, the HS 250h braking system is comprehensive, and as a Lexus hybrid it is augmented by regenerative braking which also helps recharge the hybrid battery back and improve fuel economy.

The HS uses a newly developed electronic controlled brake (ECB) system actuator that is managed by the ECB computer and acts on the system’s hydraulic brake components. The ECB computer also controls the interaction between the four-wheel disc friction brakes and the regenerative brake system. The new ECB actuator is smaller, lighter and consumes less electrical current than previous systems, making additional contributions to fuel economy. Enhancements in the system design also help improve brake feel and controllability.

2010 Lexus HS 250h Overview Part I: Engine, Aerodynamics, Fuel Economy
2010 Lexus HS 250h Overview Part II: Technology
2010 Lexus HS 250h Overview Part IV: Comfort and Convenience
2010 Lexus HS 250h Overview Part V: Safety

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