The new V8 engine is the most technologically advanced internal-combustion engine ever developed by Lexus engineers.
Kevin Jos - SAE - Dec. 2006
2007 Lexus LS600h - The epitome of a Luxury w/ Toyota’s hybrid drivetrain.
The purpose of developing the LS 600h according to Lexus was to create a car that explores the outer reaches of performance, design, safety, and efficiency. The company wanted to build upon its highest expression of “L-finesse” design with the world’s most advanced safety technology and the highest possible standards in production, quality, and comfort.
Launched to the public at the 2006 Paris Motor Show, the LS 600h is the world’s first production vehicle to feature a full-hybrid V8 powertrain, combining a 5.0-L gasoline engine with high-output electric motors; a new largecapacity nickel-metal hydride battery pack; a dual-stage continuously variable transmission, and permanent all-wheel drive. As with the Lexus RX and GS hybrid models, the LS’s “600” suffix refers not to engine cubic capacity but comparable power output. A peak combined output rating of more than 330 kW (442 hp) offers the power and performance of a normally aspirated V12 engine, says Lexus, while still beating any other gasoline car in the segment in terms of fuel efficiency, which is below 9.5 L/100 km. In addition, CO2 emissions of less than 220 g/km match the most frugal diesels in the segment. The inherent NVH improvements offered by a hybrid powertrain means the LS 600h sets a new standard for silent running in the premium segment.
The new V8 engine is the most technologically advanced internal-combustion engine ever developed by Lexus engineers. Highlights include high-rigidity components, optimum moving-part balance, minimization of friction, and unprecedented precision of assembly. To reduce weight of the engine, the cylinder block is die-cast from a high-strength aluminum alloy. The engine head is in a lightweight magnesium alloy.
The engine features a D-4S (Direct injection, 4-stroke Superior version) stoichiometric direct-injection system with two injectors per cylinder for optimum engine efficiency throughout the power band, 7.5% better torque across the rev range, and substantially reduced combustion fluctuations in comparison to a conventional direct or port injection system. The powerplant’s Dual VVT-I variable intake and exhaust valve timing system incorporates VVT-iE, the world’s first electric-motordriven intake camshaft.
The Lexus Hybrid Drive employs a threephase, permanent-magnet, ac synchronous type motor operating at 650 V and delivering more than 160 kW (215 hp). By changing magnet distribution, Lexus says it has achieved astonishing operating quietness.
As in the GS 450h, the electric motor, generator, power split planetary gear mechanism, and motor-speed reduction gearing are all housed in a compact transmission casing. The two-stage gearing of the E-CVT (electric continuously variable transmission) generates maximum low-gear torque for significantly enhanced acceleration as well as extended highgear performance for high-speed cruising with improved fuel efficiency.
The LS 600h’s air suspension uses new pneumatic springs operating in cooperation with an improved adaptive variable suspension system (AVS) that features a vehicle posture control to synchronize vehicle roll and pitch when cornering for maximum comfort. An enhanced pre-crash safety system offers assistance to the driver in collision avoidance by incorporating four world firsts: an advanced obstacle detection system, a driver monitoring system, emergency steering assist, and a rear pre-crash safety system. Other driver aids are adaptive cruise control (ACC), lane-departure warning, and lane-keeping assist.
Lexus will introduce an extended 5150-mm (202.8-in) version of the LS 600h with a 120 mm (4.7 in) longer wheelbase, with space dedicated entirely to increased rear-passenger legroom. This makes room for reclining seats with leg and foot rest, a Rear Seat Relaxation System, and a second DVD changer for individualized rear seat entertainment. In addition, the LS 600h L features unique innovations such as a rear seat cushion airbag and an IR body heat-sensing climate control system. Twenty individual outlets distribute warm or cold air through the cabin of the LS 600h L, with rear-seat passengers benefitting from the world’s first roof climate diffusers.
The LS 600h will also feature the world’s first application of low-beam LED headlight technology.