The all-new 2010 Lexus HS25h hybrid will keep more of your money in your pocket as you pass gas stations, and will also have you seated in a Lexus with all of the luxury, convenience and safety that you expect from a Lexus. The HS250h is the first luxury hybrid to achieve an EPA estimated rating of 35mpg combined and is the first luxury car to come standard with a supplemental restraint system of ten airbags.
Hybrid efficiency is at the core of the new HS25h and Lexus’s first four-cylinder gas engine and latest hybrid system take advantage of the company’s continuous engineering advances to maximize fuel economy, minimize emissions and deliver driving pleasure.
A highly efficient engine design, an exhaust heat recovery system, major efforts to reduce parasitic losses, a new evaporative emissions system and driver-selectable driving modes all make notable contributions. Significant efforts were also made to minimize engine noise.
An Atkinson-Cycle engine design was chosen for its high-efficiency and compatibility with hybrid operation in the new HS. The twin-cam engine uses four-valves per cylinder and variable valve timing with intelligence on the intake side. The engine is undersquare, with an 88.5mm bore diameter and 96mm stroke, and has a relatively high compression ratio of 12.5:1. Peak output equals 147hp and in combination with the hybrid drive motor, the HS generates 187 total system horsepower. That is the most of any other dedicated hybrid motor.
Careful design of the intake system reduces engine pumping losses and its twin resonators minimize intake noise. The cooling system uses modular construction that combines an aluminum engine radiator, hybrid system radiator, AC condenser and fan into a single assembly for minimal weight. Plus, the electric fan speed is controlled via Pulse Width Modulation to reduce energy consumption and noise. Careful ducting of the cooling system helps to prevent hot engine air recirculation that tends to occur at low speeds and while idling, further enhancing efficiency.
One of the keys to lower fuel consumption involves heat. Similar to the Lexus RX450h luxury SUV, the HS employs an Exhaust Heat Recovery system that captures the heat of spent exhaust gases to speed engine coolant warm-up and allow the hybrid system to stop the engine earlier, and more often in the driving cycle when it’s not needed, for example in lower power demand conditions in city driving. Overall, the system can improve fuel efficiency by as much as 7% in low ambient temperatures.
Using a two-motor hybrid system, the new HS uses a 141hp drive motor that is combined with the 147 gas engine. A second motor in the hybrid system serves as both engine starter and generator to charge the hybrid battery pack located behind the rear seats.
The efficient two-motor system also uses an electronically-controlled continuously variable transmission (CVT) that is a model of efficiency, simplicity and compact size with extremely smooth and quiet operation. A motor speed reduction planetary gear unit helps provide high power output in this small package. The HS also uses an easy-to-operate shift-by-wire system that eliminates the need for bulky shift cables, saving space and weight while allowing much more design freedom in placing the shift lever in the interior. An electric transmission oil pump eliminates another source of parasitic loss to further increase efficiency. Electronic operation allows a control strategy that invokes the oil pump only when needed, and since the oil also flows over the drive motor, overall efficiency of the motor and transmission are improved. I was truly impressed with the smooth and quiet operation of the motor and CVT, never hearing or feeling either during operation.
The HS250h also incorporates a drive-mode switch that allows you to select between four modes: Normal, Power, Eco and EV. Each switch position changes the rate of throttle opening for a given throttle-pedal angle. Normal mode has an essentially linear throttle response that gives naturally progressive power. Power mode can be selected for a more responsive feel when desired, such as when merging onto fast moving traffic or when you want to quickly maneuver around slow city traffic. In Eco mode, AC settings are adjusted and the throttle response is reduced relative to the pedal angle to emphasize fuel economy, such as when you are in rush hour traffic or on short trips around town with little traffic. Under certain circumstances, the EV mode can allow the vehicle to be driven short distances using only the electric motors. Acceleration from 0-60mph was surprisingly quick at 8.4 seconds in Power mode. Responsive passing acceleration benefits from the instant torque of the electric motors and the CVT’s ability to quickly find the optimal gear ratio to enhance your driving experience.
The HS250h body design received considerable attention to aerodynamics at Lexus. Ambitious goals were set requiring designers to work closely with aerodynamics from the outset to create a low-drag from in an attractive, spacious, yet compact package. Their work yielded a coefficient of drag of just 0.27, among the best, enhancing fuel economy at highway speeds and lessening outside wind noise.
The low nose encourages airflow while also helping enhance vehicle dynamics. Smooth transitions along the front fender and A-pillar avoid disturbance of the airflow. Subtle front-and-rear bumper spoilers and an available rear lip spoiler contribute to low drag and minimize lift. The body sides taper from the center pillar to the rear where thy meet the slightly kicked-out tail LED taillamps, helping reduce drag-inducing wake turbulence. Also, a gull wing-shaped roof panel enabled designers to lower its profile to reduce air resistance and with a shape that is naturally stiffer than a conventional curved-roof, engineers were able to reduce its thickness for further weight reduction. These improvements also lessen noise as the HS cuts through the air at speed.
Several measures were also taken under the car to promote and reduce drag. Airflow resistance in the engine compartment was improved by optimizing the duct profiles around the radiator. Careful positioning of numerous underfloor covers plus added diffuser fins on the rear covers further reduce drag while enhancing straight-line stability.
The car feels solidly planted at straight-line speed and is so quiet.
Underlying the HS250h’s forward-thinking interior design is the implementation of bioplastic material. Known mover formally as Ecological Plastic, the bioplastic uses plant sources as raw material and is used for parts of the interior upholstery in the car. Ecological Plastics are used in a number of injection-molded foam and board components throughout the car, including trunk compartment trim, cowl side trim, door scuff plates, seat cushions and package tray. Overall, approximately 30% of the combined interior and truck are covered in Ecological Plastic.
From the driver’s perspective, several important developments inside the HS250h transform the driving experience, making it easier and more enjoyable while also helping to enhance your attention to the road ahead.
The standard Lexus Premium Audio system offers a comprehensive suite that includes voice recognition, Bluetooth, an integrated satellite radio receiver, and USB/iPod connectivity operated via steering wheel controls or from the display screen. A multi-informational display situated in the instrument cluster keeps you informed of the numerous actions controlled by the steering-wheel mounted switches. The car’s next-generation navigation system is optional and features Lexus’s exclusive Remote Touch controller with user-adjustable haptic feedback. The innovative controller, similar to a computer mouse, eliminates the need for touch screen controls, allowing the pop-up navigation system to be mounted further up the center stack and away from you. You also benefit with a clear, high-resolution screen, improved site lines and reduced eye movement. These advances combined with the physical feedback provided by the controller make the system extremely easy to use. Just point and click, just on your computer, amazingly simple.
Voice command, a casual-language-based voice recognition feature, is standard on navigation-equipped vehicles. This new technology allows you to give fewer and more flexible conversational commands in a specific order for easier access to audio, climate, and navigation system functions to help you focus more on the road ahead.
Another driver-inspired development is an optional ‘head’s-up’ display (HUD). This system projects a miniature display on a small portion of the windshield in front of you, significantly reducing eye movement to see frequently viewed information such as vehicle speed. The display has been developed for maximum visibility, with crisp, high-contrast white lighting that makes it possible to see even in difficult lighting conditions such as driving on snow-covered roads. In addition to speed, the system also displays turn-by-turn navigation arrows and driver-assist warnings, as well as audio information and Touch Tracer (sensors on steering-wheel switches will show an image of switch layout in the HUD) both of which can be turned off separately from the rest of the display.
The high-visibility electro-luminescent instrument cluster offers new ideas of keeping track of the various systems in the car and helps you to conserve fuel. A hybrid system indicator displays the hybrid system output and regenerative charging status, simultaneously indicating the efficiency of the system related to your driving style. An auxiliary Eco Drive indicator light further assists you in maintaining the most economical use of system power.
The multi-information display resides in the center of the hybrid system indicator. It uses high-contrast organic light-emitting diode (OLED) technology for maximum visibility and indicates various conditions such as fuel consumption, ambient temperature and cruising range. Also, several vehicle functions can be customized through use of the display with the multi-information switch.
Like most Lexus vehicles, the HS250h has an optional navigation equipped with a back-up monitor. In addition, the new HS250h offers an available Wide-View Front Monitor t help enhance your ability to see in the traditionally blind area around the front of the car. The front grille-mounted camera has a maximum 190-degree lateral field of view and allows you to see as close as 24 inches in front of the car within an 83-degree vertical field of view. Images from the two monitors feed into the available park assist ECU which processes and sends them to the navigation system display at separate times depending on whether the vehicle is moving forward or backward. The front monitor operates in either of two modes. Normal mode allows you to manually operate the camera with a switch on the lower left of the dashboard area. In auto mode, images from the front monitor automatically displays when the vehicle slows to about 6mph or less and automatically shuts off when speed rises above 7mph. You can also toggle from the front monitor on or off while in the auto model. To other items related to visibility of your surrounding when driving is the slim A-pillar structure that helps improve visibility when pulling out of a parking space, inside or outside. HS250h engineers were able to create a relatively slim A-pillar structure to help improve visibility without degrading the structural integrity. Also the HS250h uses side glass with a water-repellent coating that improves wet weather visibility and aids defrosting performance.
As it is with ride, handling, noise and vibration, the body structure plays a key role in the fundamental safety characteristics of the new HS250h. To help protect you and your passengers, the body is designed to be strong but strategically resilient to help absorb and distribute energy in the event of a crash. High tensile steel components are carefully located in the body structure, doors, and other areas to help ensure strength in key areas.
All HS250h hybrids come with a class-leading 10-airbags with dual-stage and knee airbags up front, side curtain airbags and both front and rear seat-mounted side airbags to help protect front and rear passengers in certain types of severe front and side collisions. The front passenger is equipped with a twin-chamber airbag that further helps provide occupant protection. Additionally, front and outer rear seatbelts incorporate pretensioners with force-limiters to help further protect occupants in certain collisions. Active head restraints are also standard.
An optional Pre-Collision system (PCS) with Dynamic Radar Cruise Control and Driver Monitor uses millimeter-wave radar to measure and maintain a pre-set following distance from a vehicle traveling ahead. The radar sensor is designed to detect certain obstacles in front of the car, and a PCS computer with vehicle speed, steering angle and yaw-rate inputs, helps to determine whether a collision is highly possible. In such a situation, PCS alerts you with audible and visual warnings, preemptively retracts front seatbelts and pre-initializes Brake Assist (BA) so that increased braking will be applied the instant you depress the pedal. All of these safety systems only enhance the driving pleasure and enjoyment, never getting in the way of your regular or current driving style.
The interior of the HS250h was designed to communicate the high level of innovation inherent in the car with the craftsmanship expected from Lexus vehicles. Lexus’s exclusive Remote Touch navigation system controller is a focal point of the interior design because of the many times that you will be using it. As a real Lexus luxury car, the HS250h is comfortable with plenty of room for five people; as such the designers were intent on creating a fresh, appealing design befitting the brand that is also hybrid-distinct.
Comfortable, supportive, 10-way power adjustable leather trimmed driver’s seat and 8-way powered front-passenger seat are standard, and special soft touch stitched details on the center stack and instrument hood provide an extra premium touch in the cabin. There are two levels of the new HS250h, standard and premium. Interior trim color includes black leather, new light gray leather, parchment leather and for the toping touring package, a distinctive black/light gray two-tone leather trim. A high-finish dark gray trim is featured on the standard model while the premium model has brown walnut wood trim.
Front door trims also mimics the shape of the center stack and armrest providing a comfortable symmetry. The steering wheel center pad appears to float on the wheel, surrounded by control switches that also mimic the design and color of those on the center stack. The sporty leather-wrapped steering wheel also features tilt/telescoping adjustments for the perfect placement in your hands.
Comfort, quietness and convenience are a hallmark of all Lexus interiors so the HS250h comes with a host of each. When more than one driver uses the HS250h, an optional new memory system allows individual driver settings for seat position, steering wheel position, exterior mirror positions, and A/C setting. The leather front bucket seats with the premium model get heated and ventilated seats that are trimmed with semi-aniline leather.
Climate control in the HS250h is designed to provide comfort and clean air for all passengers. A dual temperature control system is used for front occupants and a dedicated rear blower is mounted at the rear of the center console promoting quick cool down in the rear. A plasma cluster ion generator, A/C clean air filter and a pollen removal mode help clear air inside the cabin. The interior gets a little extra help from the windshield, which has infrared-ray reduction properties that help keep the interior cool, allowing a smaller size A/C system than would be required. A 10-speaker, 137-watt Lexus Premium audio system features a six-disc CD changer, a subwoofer, and center speaker standard. The Mark Levinson 5.1 channel premium surround sound system features 330-watts at only 0.1% total harmonic distortion and the system uses 15-strategically placed speakers, it is one of the best.
Nimble handling, excellent body control, quick reaction, a smooth ride and low noise in the HS250h are the best of any dedicated hybrid that I have tested so far this year. It all starts with a stiff body structure. The HS body is designed wit superior stiffness overall with added focus in strategically-located areas that have the great 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 independent front suspension. The set employs a 24mm stabilizer bar plus large diameter pistons and rebound springs in the shock absorbers to help provide superior ride control at high speeds or when driving on curving roads getting off a freeway exit or in the mountains. The steering rack is directly mounted (no rubber bushings) to crate an unfiltered connection between it and the suspension members to help accurately communicate what is happening where the rubber meets the pavement. Both setups reactive quickly to my inputs and I was surprised how easy it was to slice through the curving roads in the mountains.
The double-wishbone rear suspension also balances performance and comfort and is important to its overall handling. Its compact design uses low-mount coil springs that also 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. I was amazed how well the HS250h handled during my test drive. Unlike other dedicated hybrid, I looked forward to driving the car as much as I could.
The new HS250h rides on standard 17X7in. alloy wheels wrapped with 215/55R17in. all-season tires. The premium model comes with 18X8in. alloy wheels wrapped with 225/45R18in. all-season tires. All wheels feature the direct-type Tire Pressure Monitoring System.
Going back to the fun and pleasure of driving the new HS250h is the improvement in the electric power steering (EPS) system. The vehicle speed-sensitive steering has been optimized to provide the ideal steering feel at any speed. Inertia compensation control, friction feedback and recovery control assist in tailoring the steering feel and effort that is most effective for a majority of drivers. I thought that the feedback and on center feel were superb. At speed the wheel got heavier and the feel for the road increased.
Like all Lexus vehicles the new HS250h braking system is comprehensive, and as a Lexus hybrid it is augmented by regenerative braking which also helps recharge the hybrid battery pack 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. To my foot the feeling was always linear and always direct reacting to the force I applied. Up front are 10.8in. vented discs and 11.1in. solid discs in the rear. Braking control is enhanced with ABS and BA. Further enhancing your control during braking is standard all-speed traction control and electronic stability control to help you maintain your desired direction under severe braking maneuvers over slick pavement.
Standard features not mentioned above include: vehicle theft-deterrent system, courtesy lights mounted on the doors, illuminated glove box, front dual cupholders, rear seat center pull-down armrest with dual cupholders, front map lights, rear cargo light, LED footwell lights, two 12-volt power outlets, programmable garage door opener, manual front seatbelt adjustment, power windows/door locks with all windows express up/down, anti-lockout feature, four grab handles, dual sliding/illuminated sun visors, electric fuel door and trunk releases, center console with storage bin and dual cupholders, front-rear door cupholders can hold 20oz. water bottles, tool kit, first aid kit, coat hooks, cut pile carpeting, carpeted floor mats, five separate manually adjustable headrests, scheduled maintainance indicator light, exclusive chrome-accented hybrid front grille design, blue highlights added to front and rear ‘L’ logo, engine cover, projector beam headlamps, rear combination lamp clusters with LED brake and tail lights, color keyed lower front and rear spoilers, turn signal lamps integrated into the side mirrors, puddle lamps, power moonroof, aluminum hood, full-perimeter chrome wrap-around greenhouse with lower chrome stick below the doors with Hybrid signage, sound insulation placed in door panels, instrument panel and floor mats, Smart Access key system with start/stop ignition button, variable intermittent wipers/washers, self-dimming rearview mirror with compass, auto on/off headlamps, heated outside mirrors, and foglamps. The Premium model gets all of the above and rain-sensing wipers.
You can now get Lexus Enform which offers all-new telematics, with Safety Connect, available by subscription. Both use the response center that is open 24-hours a day/7-days a week for safety concerns and concierge needs on your trip.
The all-new 2010 Lexus HS250h is on the cutting edge of hybrid energy driven automobiles and is injected with the Lexus knowhow of luxury, quality, workmanship and engineering. It is the first ‘purpose built’ luxury hybrid and is perfect for the family that is used to the finer things in life that want to keep their driving ‘footprint’ as small as possible.
Prices start at $28,000.00 for the standard model, and up to $34,000.00 for the premium model. The all-new HS250h is another industry first from Lexus.
COPYRIGHT:2010:HARVEY SCHWARTZ
SPECIFICATIONS
Type: Midsize Sedan
Where Built: Japan
EPA Class: Midsize Cars
Dimensions
Exterior
Length: 184.8 in. Width: 70.3 in.
Height: 59.3 in. Wheel Base: 106.3 in.
Ground Clearance: 6.1 in.
Curb Weight: 3682 lbs.
Gross Weight: 4686 lbs.
Interior
Front Head Room: 38 in.
Front Hip Room: 52.8 in.
Front Shoulder Room: 53.8 in.
Rear Head Room: 36.8 in.
Rear Shoulder Room: 54.2 in.
Rear Hip Room: 51.2 in.
Front Leg Room: 42.6 in.
Rear Leg Room: 34.5 in.
Luggage Capacity: 12.1 cu. ft.
Maximum Cargo Capacity: 12 cu. ft.
Maximum Seating: 5
Performance Data
Base Number of Cylinders: 4
Base Engine Size: 2.4 liters
Base Engine Type: Inline 4
Horsepower: 187 hp
Max Horsepower: 6000 rpm
Drive Type: FWD
Turning Circle: 37.4 ft.
Fuel Data
Fuel Tank Capacity: 14.5 gal.
EPA Mileage Estimates: (City/Highway/Combined)
Automatic: 35 mpg / 34 mpg / 35 mpg
Range in Miles:
Automatic: 507.5 mi. / 493 mi. / 507.5 mi.
