2012 Lexus HS 250h Hybrid Luxury Sedan
As the world‘s first dedicated luxury hybrid, the Lexus HS 250h brought sustainable luxury to the forefront of the luxury market.
The 2012 Lexus HS 250h hybrid sedan continues to demonstrate innovative engineering in a sustainable package.
In its third model year, the Lexus HS 250h features one new exterior color as Nebula Gray Pearl replaces Smoky Granite Mica for 2012.
Available in standard and Premium models, the 2012 HS 250h has a combined EPA-estimated fuel economy rating of 35 mpg combined, 35 mpg city and 34 mpg on the highway utilizing regular 87-octane gasoline.
Engine and Hybrid System
The 2012 Lexus HS 250h features the brand’s first four-cylinder gas engine paired with Lexus Hybrid Drive. An Atkinson-cycle engine design was chosen for its high efficiency and compatibility with hybrid operation in the HS 250h.
The twin-cam engine uses four valves per cylinder and Variable Valve Timing with Intelligence (VVT-i) on the intake side. The engine is undersquare, with a 3.48-in. bore diameter and 3.78-in. stroke, and has a relatively high compression ratio of 12.5:1. Peak output equals 147 horsepower and in combination with the hybrid drive motor, the HS 250h generates 187 total system horsepower.
The 2012 Lexus HS 250h meets the California SULEV and federal Tier 2 Bin 3 exhaust emission standards and also augmented by a system that reduces evaporative emissions to near zero.Similar to the Lexus RX 450h luxury utility vehicle, 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 low power demand conditions in city driving. Overall, the system can improve fuel efficiency by as much as seven percent in low ambient temperatures.
Using a two-motor hybrid system, the 2012 HS 250h uses a 141 hp drive motor that combines with the gas engine. (Note that the sum of the engine and motor power are not equal to the total system power as the operation of the engine and motor cannot be maximized in the same operation range). A second motor in the hybrid system serves as both engine starter and generator to charge the hybrid battery pack.
The efficient two-motor system also uses an Electronically Controlled Continuously Variable Transmission (ECVT) 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 250h also incorporates drive-mode buttons that allow the driver to select between four modes: Normal, Power, Eco and EV. Each mode 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. In Eco mode, air conditioning settings are adjusted and the throttle response is reduced relative to the pedal angle to emphasize fuel economy. Under certain circumstances, the EV mode can allow the vehicle to be driven short distances using only the electric motors.
Acceleration from 0-to-60 mph is rated at 8.4 seconds. Responsive passing acceleration that benefits from the instant torque of the electric motor and the ECVT’s ability to quickly find the optimal gear ratio enhance the driving experience.
The HS 250h conveys comfort with its standard leather-trimmed seating, 10-way power-adjustable driver’s seat with power lumbar and eight-way power-adjustable front passenger seat. The HS 250h Premium model receives heated and ventilated 10-way power front seats trimmed in semi-aniline leather.When more than one driver uses the HS 250h, an available memory system allows individual driver settings to be recalled automatically by individual keys, saving the drivers the trouble of recalling their particular setting. The system memorizes the steering-wheel position, seat position, exterior mirror positions and air conditioning settings associated with each key, translating to shorter preparation time prior to driving.
The high-visibility, electro-luminescent instrument cluster offers fresh methods of keeping track of the various systems in the car and helps the driver 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 driving style. An auxiliary Eco Drive Indicator light further assists the driver in maintaining the most economical use of system power.
A multi-information display situated in the instrument cluster keeps the driver informed of the numerous actions controlled by the steering wheel-mounted switches. 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. Additionally, several vehicle functions can be customized through use of the display with the steering-wheel mounted multi-information switch.
Climate control is designed to provide comfort and clean air for all passengers. A dual temperature control system is used for front seat occupants and a dedicated rear blower mounted in the center console promotes quick cool down for the rear passengers. A Plasmacluster ion generator, A/C clean air filter and a pollen removal mode help clean air inside the cabin.
A standard 10-speaker, 137-watt Lexus Premium audio system featuring a six-disc CD changer, a subwoofer and center speaker uses two-way woofer and tweeter systems in both front and rear for rich, clear sound quality. It also offers Bluetooth wireless connectivity, an integrated SiriusXM Satellite Radio receiver (includes complimentary 90-day trial subscription) and USB/iPod connectivity. When an iPod is attached via the USB port it can be operated via steering wheel controls or from the display screen while information such as names for the artist, track and album is displayed on the headunit or available navigation screen.
Audiophiles will appreciate the optional Mark Levinson 7.1-channel Premium Surround Sound system. Power is rated at 330 watts at only 0.1 percent total harmonic distortion from 20-20,000 Hz, and the system uses 15 strategically placed speakers for outstanding audio performance and sound quality.From the driver’s perspective, several important developments inside the HS 250h transform the driving experience, making it easier and more enjoyable while also helping to enhance the driver’s attention to the road ahead.
The optional navigation system features Bluetooth hands free phone, phone book download capabilities, and Lexus’ 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 screen to be mounted further up the center stack and away from the driver. The driver benefits 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.
A back-up camera and voice command, a casual-language-based voice recognition feature, are standard on navigation-equipped vehicles. Voice command technology allows the driver to give fewer and more flexible, conversational commands in a specific order for easier access to audio, climate, and navigation system functions to help drivers focus more on the road ahead.
An available Wide-view Front Camera helps enhance the driver’s ability to see in the traditionally difficult areas around the front of the vehicle. The front grille-mounted camera has a maximum 190-degree lateral field of view and allows the driver to see as close as approximately 24 inches in front of the car within an 83-degree vertical field of view.
The Lexus HS 250h also offers a telematics system, Lexus Enform with Safety Connect, available by subscription. Complimentary one-year trial subscriptions are included on all purchases of new Lexus vehicles equipped with these features. Safety Connect is standard on all vehicles while Lexus Enform with Safety Connect is on all vehicles equipped with the optional Navigation system. The Lexus Enform and the Safety Connect response centers operate 24 hours a day, 7 days a week—every day of the year.
Lexus Enform vehicles are factory ready for subscriptions to a variety of innovative SiriusXM services including NavTraffic, NavWeather, Sports, and Stocks. SiriusXM services offer complimentary 90-day trial subscriptions and require separate audio and data subscriptions.
The HS 250h incorporates a standard 10-airbag Supplemental Restraint System (SRS) with dual-stage airbags and knee airbags for driver and front passenger, side curtain airbags, and both front and rear seat-mounted side airbags to help protect front and rear outboard passengers in certain types of severe frontal or side collisions. The front passenger is equipped with a twin-chamber airbag that further helps provide occupant protection.
An optional Pre-Collision System (PCS) with Dynamic Radar Cruise Control and Driver Monitor can help reduce collision damage. Dynamic Radar Cruise Control uses millimeter-wave radar to measure and help 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 the driver with audible and visual warnings, preemptively retracts front seat belts and pre-initializes Brake Assist (BA) so that increased braking will be applied the instant the driver depresses the pedal.
The 2012 Lexus HS 250h comes with a 48-month/50,000-mile basic limited warranty with roadside assistance for 48 months/unlimited miles. Powertrain and restraint system coverage is provided for 72 months/70,000 miles. Corrosion perforation protection is covered for 72 months, regardless of mileage. The hybrid-related components, including the HV battery, battery-control module, hybrid control module and inverter with converter, are covered for eight years/100,000 miles.
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