Crafting a Unique Identity
Lexus designers took full advantage of the new platform, with its lower profile and length on par with that of a prestige long-wheelbase sedan, to give the new LS a stretched, ground-hugging appearance. Compared to the outgoing LS, the new model is about 0.6 inches lower, while the hood and trunk are approximately 1.2 inches and 1.6 inches lower, respectively.
Following the “Yet” philosophy that has been passed on since the first-generation LS, Lexus created a design offering the room and comfort of a prestige “three-box” sedan, yet with the more striking coupe-like silhouette that holds stronger appeal for many of today’s luxury customers. The new LS is also the first Lexus sedan with a six-window profile, which enables excellent outward visibility. A first for a Lexus sedan, the flush-surface windows smoothly integrate with the side pillar.
The unique rendition of the spindle grille mesh, with a texture that seemingly changes in changing light, is the result of both intense CAD development and hand-adjusting thousands of individual surfaces. Flanking the unique grille, the narrow slit-like 3-projector lamp merges with an L-shaped LED lamp that wraps broadly around to the side to give the front of the LS a resolute gaze.
The coupe-like silhouette is not due solely to the fastback roof style. Maximizing the GA?L platform’s low form, the pillars of the cabin taper from the central position of the occupants. Together with the contrast between the pulled-in doors and the front and rear fenders that flare away from the central position of the occupants, this creates a dynamic form.
A front to the rear shoulder line gives the vehicle’s basic posture a low stance with a horizontal axis and a bold appearance. Additionally, the axes of the dramatically flared front and rear fenders are slanted forwards, creating a dynamic impression that evokes driving performance. An outer slide-type moonroof preserves headroom with the lower roofline.
The 2018 LS debuts two new 19-inch wheel designs and three 20-inch wheel designs, two of which are also new. The 20-inch premium wheels employ a brilliant appearance created using an electroplating technique known as sputtering. All but one (F SPORT) of the new wheel designs feature a hollow rim structure that helps reduce resonant sounds generated by the tires.
More than ever before, luxury sedan drivers demand greater handling agility and performance feel, but without sacrificing comfort. It’s one of the most difficult balances to achieve in a vehicle, yet the new Lexus GA–L platform easily meets this challenge.
The GA-L platform is the stiffest in Lexus history, setting the stage for enhanced handling, ride smoothness and cabin quietness. The 123-inch wheelbase is 1.3-inch longer than the outgoing LS long-wheelbase model. The new wide and low LS design optimizes the center of gravity and weight distribution.
Helping to provide the uncanny ride and handling balance in the new LS is the latest generation of a chassis control technology: Vehicle Dynamics Integrated Management (VDIM), which was first introduced in 2005.
This system implements cooperative control of all available vehicle subsystems— ABS, Traction Control (TRAC/TRC), Vehicle Stability Control (VSC) and Electric Power Steering (EPS), Variable Gear Ratio Steering (VGRS) and Dynamic Rear Steering (DRS)—to control basic longitudinal, lateral and vertical motion as well as yaw, roll and pitch.
The all-new GA-L vehicle architecture that underpins the LS is the result of a completely new approach to engineering, materials and loads of the vehicle structure. Rather than starting from existing vehicle platform and then figuring out how to modify it to fit the LS’ shape and strengthen it to support contemporary chassis dynamics, Lexus engineers literally started with a clean sheet of paper – a blank CAD screen– in designing the new structure.
Examples of this can be easily seen underhood, where new cast-aluminum suspension towers that support the upper spring seats and suspension mounts are visible above each front wheel. Since aluminum and steel can’t be welded together with conventional techniques, the joint attaching the aluminum tower casting to the steel body structure is made with self-piercing rivets and high-strength adhesive bonding; similar processes are used to secure the aluminum rear suspension towers to the body structure behind the back seats. Compared to structures with similar capabilities in steel, this technology is 42 percent lighter at the front; in the rear the aluminum structure has 1.5 times the rigidity of steel with 50 percent less weight.
In creating the new LS, engineers used lightweight materials including ultra-high tensile hot stamped steel and other steel alloys in critical areas with tensile strengths from 590 up to 1180 MPa and aluminum. The 2018 LS has a high tensile steel mass composition of nearly 30 percent, which is more than double what was present in the previous-generation LS (14.1 percent).
A combination of special body adhesive and the use of Laser Screw Welding, a proprietary laser welding process proven on other recent Lexus models, increases panel joint rigidity and gives the LS a feeling of exceptional strength and solidity.
Critical to its driving performance, the new platform lowers the vehicle’s center of gravity by placing most of its mass, including the engine and the occupants in positions more centralized and lower in the chassis. Special braces in the engine compartment, stiff aluminum front and rear suspension towers, and other features help bolster the strength of key chassis structures.
LS Performance and Smoothness Redefined: Twin-Turbo V6 and 10-Speed Transmission
For high power, scintillating performance and excellent fuel efficiency, Lexus designed an all-new 60-degree 3.5-liter V6 engine specifically for the new LS. This engine has an undersquare design for improved thermal efficiency coupled with twin turbochargers, and has benefitted from the company’s F1 technology. This new LS engine is indicative of the more dynamic approach being taken by Lexus, offering V8-level power in a more compact package with efficiency and refinement.
The new LS engine offers the output one would expect in a flagship sedan: 416 horsepower and 442 lb-ft of torque, significant gains over the outgoing LS model’s naturally aspirated 4.6-liter V8 (386 hp and 367 lb-ft). The engine’s long stroke, optimized 0.86 bore-to-stroke ratio, increased valve angle, straight intake ports and laser-clad intake valve seats developed using performance simulations based on F1 technology combine to yield world top-level high-speed combustion technology and thermal efficiency.
The twin turbochargers were designed and produced in-house to control tolerances and quality. They achieve top-level mechanical efficiency by improving exhaust energy recovery using a curved turbine blade shape and increased blade length, along with die-cast compressor housings and improved surface precision. Electric wastegates provide ultra-precise turbo boost control for seamless, lag-free power buildup. The intercoolers are cooled by engine coolant for higher performance and efficiency.
In RWD form, the new LS 500 sees a 0-60 time of 4.6 seconds. Perhaps more critical to driving enjoyment, though, is how Lexus tuned the engine and transmission to deliver instant acceleration and a constant buildup of torque toward the engine’s redline. The driver can tailor powertrain response and feel by choosing from Normal, Sport S or Sport S+ modes. Just enough of the exhaust note can be heard to enhance the car’s dynamic nature.
The first-ever 10-speed automatic transmission for a premium passenger car, having debuted in the Lexus LC 500, is now also used in the new LS 500 gas models. It is a torque converter automatic, yet with shift times that rival those of dual-clutch transmissions. The wide bandwidth afforded by 10 closely spaced ratios is ideal for all driving situations. Using aluminum for the clutch drum, clutch hub and planetary carrier reduce rotating mass; coupled with shortened internal oil passages and smaller, faster shift solenoids results in quicker shifts. These improvements, plus a resin plastic transmission oil pan, yield a 10-speed transmission weighing the same as the previous 8-speed gearbox.
For starting acceleration, the close ratios of the low gears and the short shift times enable a rhythmical and exhilarating acceleration feel. The high torque of the twin-turbo engine matches ideally with the higher gear ratios for effortless, serene highway cruising, yet very quick downshifts yield direct acceleration with no lag in G response. To provide a direct feel, while also supporting fuel efficiency, torque converter lock-up activates in all ranges except when starting off.
The available AWD system features a Torsen® limited-slip center differential to further enhance grip, traction and cornering stability. The torque distribution can vary from 31 percent front / 69 percent rear on dry roads to as much as 48 percent front / 52 percent rear on slick surfaces.
The New LS Hybrid
The 2018 LS Hybrid takes an entirely different approach than the previous LS Hybrid model. The new Multi Stage Hybrid System, which debuted in the LC 500h Coupe, combines a naturally aspirated Atkinson-cycle 3.5-liter V6 gasoline engine with two electric motor/generators and uses a compact, lightweight lithium-ion battery. D-4S direct fuel injection and lightweight valvetrain components allow a 6,600-rpm redline, with Dual Variable Valve Timing with Intelligence (Dual VVT-i) ensuring ample torque across the engine speed range. Combined system output of the internal combustion engine with the electric traction system is 354 hp, enabling the LS 500h to accelerate from 0-60 mph in 5.1 seconds (RWD).
The new system is based on the electronically controlled planetary continuously variable transmission of Lexus Hybrid Synergy Drive coupled to an all-new four-speed automatic gear set at the output stage. The two systems work together to expand the overall range of gearing and increase operation of the V6 engine across a wider speed range than previous hybrids.
In M mode, the two gearsets are controlled together to provide the effect of 10 ratios, giving the LS 500h a highly engaging driving feel and allowing the driver to shift through the ratios with paddle shifters.
And with a 22.2-gallon fuel tank and 25/33/28 (city/highway/combined) manufacturer-estimated fuel economy, the LS 500h RWD has a range of over 600 miles, depending on driving conditions and habits.
The 2018 LS 500 offers a choice of nine interior color schemes, plus two for the F SPORT (Black and Circuit Red). In addition, nine choices in interior trim are available, including the exclusive Naguri-style aluminum for the F SPORT.
Nearly all elements are upholstery-wrapped, and a high level of craftsmanship has been applied even to the finer details, resulting in an elegant finish with a sense of depth. For example, the higher-grade seats feature quilting, and the perforation pattern on the F SPORT front seats has the same L-shaped mesh pattern as the car’s front grille.
Inspired by Shimamoku wood patterns, the new forms that combine the artistic combination of natural woodwork and application of Japan’s sophisticated sliced wood and laser-cutting manufacturing technologies are used for the new LS. New patterns, including Art Wood Organic, Art Wood Herringbone and Laser Special Matte feature bolder contrasts between light and dark, giving the wood a more vibrant appearance.
Art Wood Organic was inspired by a “blazing fire”, and took over a year to create. By layering the wood and applying a natural gloss coating to enhance the vibrancy of the grain, the resulting pattern gives the impression of a flickering flame.
Art Wood Herringbone features wood mosaic craftsmanship similar to that used for decorating musical instruments. Natural wood pieces are individually handcrafted by a Takumi craftsperson to create a delicate, Lexus-original mosaic, with an L-motif pattern subtly blended into the herringbone design.
To create the Laser Cut Special wood trim, a cutting and forming technology is utilized to expose beautiful metal lines beneath the natural wood veneer that can be seen and felt.
The Intersection of Tradition and Technology
A new approach to creating trim elements again turned to Japanese culture, combining traditional Japanese aesthetics with advanced manufacturing techniques. This is reflected in signature touches, such as beautiful interior ambient lighting inspired by Japanese Andon lanterns and armrests that appear to float next to the door panel.
On Executive models, Kiriko Glass ornamentation and available hand-folded pleats on the door trim perfectly illustrate the brand’s “Innovative elegance through Japanese craftsmanship” and exemplify a true handcrafted approach.
The striking cut glass ornamentation – a world first in a production vehicle - draws inspiration from Japanese Kiriko glassware. Traditional Kiriko patterns are created using a technique that involves hand-cutting clear colors and delicate lines in a piece of glass, which are then repeatedly polished to a soft glow. For the 2018 LS, Kiriko master craftsmen worked closely with Lexus designers and engineers to duplicate the hand-carved appearance of Kiriko glass using leading-edge laser data copying and polishing technology. For those not choosing the Executive Package, the look of the Kiriko glass pattern ornamentation has been adopted for the display zone in front of the passenger seat.
The hand-pleated upholstery is produced using a process that took four years to develop—and that can be done only by human hands. A single cloth sheet is folded like origami paper, each fold carefully overlapped with the next, creating a dramatic pleated effect. The effect of the light and the three-dimensional upholstery creates an elegant space that envelops the occupants.
Integrated into the LS 500’s cabin is the next-generation Remote Touch Interface (RTI), designed to mimic smartphone operation and supporting handwritten input. In addition to its 12.3-inch wide navigation display, the LS can incorporate an optional 24-inch color heads-up display (HUD)—currently the largest in the world—that projects a variety of information onto the driver’s forward view.
The Sounds of Near Silence—or Stirring Music
Lexus tuned the LS exhaust to convey a more authoritative tone, yet also designed the cabin to ensure utterly quiet cruising. New sound suppression methods further hush the environment compared even to the super-quiet previous LS models. Active Noise Control quiets the cabin even more by detecting the sound of the engine coming into the vehicle and cancelling certain frequencies using antiphase sound from the audio speakers.
The serenity of the LS cabin provides an ideal stage for the standard premium audio system or the new audiophile-worthy available 3D surround Mark Levinson QLI Reference Surround Sound System. Employing Quantum Logic Immersion technology (QLI), Clari-Fi music restoration technology and 23 speakers in 16 locations throughout the car (including the rear ceiling), and a 16-channel Mark Levinson Reference Amplifier producing the equivalent of 2400 watts with 0.05 percent Total Harmonic Distortion (THD) it offers an audio experience unparalleled in any Lexus.
Advanced Safety Features and Driver Support
Lexus safety features are developed based on the Integrated Safety Management Concept to make each driver better. The concept focuses on analyzing and optimizing safety technologies for four main causes of traffic fatalities: accidents related to pedestrians, vehicle departures from roads, intersections, and rear-end collisions.
“The LS is designed to be the top runner in advanced safety technologies,” said Lexus LS Chief Engineer Asahi. The all-new Lexus LS provides world-class safety technology through the combination of two advanced Lexus safety systems, Lexus Safety System+ and Lexus Safety System+ A (Advanced) Package, which are ultimately aimed at reducing traffic fatalities.
Lexus Safety System+ comes standard on the LS. Lexus Safety System+ A offers additional equipment and is available as an option. Both systems, in addition to other technologies, support more secure driving in a broad range of situations, providing the driver with information ranging from support status notifications to information on vehicle behavior during safety feature operation via the multi-information display and, when equipped, the large color heads-up display (HUD).
Pre-Collision System (PCS)
On cars equipped with Lexus Safety System+ A, PCS detects a pedestrian and vehicles ahead using millimeter-wave radar and a stereo camera, supporting collision prevention and damage mitigation with an alert, pre-collision brake assist and pre-collision braking. The PCS can detect a pedestrian and has improved deceleration performance during automatic braking. For example, it can decelerate the vehicle by about 37 mph, thus improving its collision-prevention performance.
Pedestrian Alert is a technology that specifies the direction of the presence of a pedestrian, and Active Steering Assist can automatically control steering and braking in certain situations. With Pedestrian Alert, if there is the possibility of a collision with a pedestrian ahead, the direction of the pedestrian’s presence is shown in an animation via the LS’s large color HUD. Active Steering Assist is designed to determine when there is a high possibility of collision with a pedestrian in the lane of travel or with some continuous structures, such as a guardrail. If the system also determines that a collision is imminent and cannot be avoided through brake control alone, but might be avoided with steering control, the system assists in collision mitigation or avoidance reduction through limited automatic steering control in addition to activating an alert and applying the brakes.
In the Lexus Safety System+ A package, All-Speed Dynamic Radar Cruise Control is combined with Lane Trace Assist (LTA) to provide steering support on a highway or motor-vehicle-only roadway under what is called Lexus CoDrive. These systems function together as a “co-driver” by effectively assisting the driver on dynamic roads or in traffic, coordinating with the LS’s large color HUD and multi-information display.
All-Speed Dynamic Radar Cruise Control
This system offers better basic recognition performance with wide-angle detection using newly developed millimeter-wave radar and a camera with a wider forward recognition range. All-Speed Dynamic Radar Cruise Control also allows for smoother acceleration at startup and while driving for a more comfortable ride, and smooth deceleration in the case of a rapid decrease speed when following another vehicle.
Lane Trace Assist (LTA)
LTA can assist the driver by “tracing” the path of the vehicle ahead in instances where lane lines might not be recognized, or in low-speed rush-hour driving when there is little distance to the preceding vehicle. The system can also assist on more dynamic roads; if the speed at which an LTA-equipped vehicle entering a curve is deemed to be too fast, the driver will be alerted by way of the LS’s HUD and multi-information display, and the vehicle may also be automatically slowed down.
Front Cross Traffic Alert (FCTA)
To help prevent collisions at intersections, FCTA is meant to detect forward cross-traffic vehicles. When approaching an intersection at low speed, the radar sensors on the front side of the vehicle can detect approaching vehicles to the left and right of the vehicle’s front end (up to a distance of 164 feet). In this case, the HUD is used to inform the driver if a vehicle is detected. If the vehicle proceeds regardless of the presence of an approaching vehicle in cross traffic, warnings are also issued by a buzzer and the LS’s multi-information display.
Lane Departure Alert (LDA) with Steering Assist
LDA helps to prevent lane departures. In addition to detecting road lane lines, under certain circumstances it is now also capable of detecting the boundaries between asphalt and such elements as grass, dirt and curbs through advances in recognition capability. Thus, it can also alert the driver when the vehicle might depart from its lane and provides assistance by operating the steering wheel to help keep the vehicle in its lane.
-- Press release courtesy of Lexus