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2006 Lexus RX 400h: Arrival of Toyota's High Performance Hybrid

Hybrid Synergy Drive reveals another virtue:engine belt-driven. This is because the gas
Performance. Public viewing of the 2006 Lexusengine often shuts down-a fuel-saving benefit
RX400 in early 2005 reveals combined fuelof the hybrid system-especially when the
efficiency in the range of the current EPAvehicle is stopped or driven slowly through
average rating for a four- cylinder compacttraffic. Except for the alternator, which is
sedan. The RX400h will be a SULEV ratedreplaced by motor-generators, all components
vehicle which means driving from Los Angelesare now electrically powered which means
to New York and back nine times (54,000notably lower parasitic losses to the engine
miles) yet produce less- smog formingand  improved  fuel  consumption.
emissions.
The Lexus hybrid technology also allows
The 2006 Lexus RX400h combines 3.3 liter V6extended electric-mode operation during low
gasoline engine with two electric drivespeed or stop-and-go driving conditions. The
motors: a strong 120 kW (161 horsepower)permanent-magnet front electric drive motor
motor positioned near the rear wheels. The(MG2) produces peak torque from zero-to-1,500
new Hybrid System will deliver a peak outputRPM, giving the RX 400h powerful and
of 270 horsepower with a 20% increaseinstantaneous response that will be
compared to the non-hybrid RX330 power train.especially felt and appreciated in low- and
Much more impressive is the 30-50 mph passingmid-speed performance and in merging and
acceleration of the high output electricpassing  maneuvers.
motor  that  delivers a high burst of torque.
A regenerative braking system further boosts
Future Toyota Hybrid Synergy Drives hold thesystem efficiency. When the RX 400h is
potential to operate even more efficientlycoasting or the brakes are applied, the
using new types of batteries and fuels.electric motors function as generators,
According to Fujio Cho, President of Toyotacapturing kinetic energy that would normally
Motor Corporation " Toyota's Hybrid Systembe lost as heat through the brakes and
will make up the heart of our hydrogen fueltransforming it into useable electricity to
cell  program  of  tomorrow".recharge  the  batteries.
The advantage of a hybrid driveline is thatWith the RX 400h, Lexus also introduces a new
it eliminates hardships associated withgeneration of vehicle stability control
electric cars to provide breakthroughsystems known as Vehicle Dynamics Integrated
performance, exemplary fuel efficiency, veryManagement (VDIM). A vital component of VDIM
low exhaust emissions, and a high level ofis a new Electronically Controlled Braking
convenience.system (ECB). The ECB system translates brake
pedal stroke speed and pressure and generates
2006 Lexus RX400h introduces a new era ofthe precise amount of combined electric
enhanced performance dimension to the widelyregeneration and hydraulic pressure needed
known hybrid advantages of excellent fuelfor  virtually  any  driving  condition.
mileage and low emissions. The RX 400h will
be rated as a Super Ultra Low EmissionVDIM allows more optimized operation of the
Vehicle (SULEV) in California (Tier 2 - Bin 3vehicle's dynamic handling systems that
in other states), one of the most stringentemploy the brakes: ABS, Brake Assist, Vehicle
emissions  ratings  in  the  industry.Stability Control (VSC) and traction control
(TRAC). VDIM also interfaces with the
The Lexus RX 400h is defined as a "fullElectronic Throttle Control system, allowing
hybrid," which means that it is capable ofit to modify vehicle power when needed, and a
operating in electric-only or gas engine-onlynew Electronic Power Steering system (EPS) to
mode as well as a mode that combines theoptimize  steering assist for each situation.
power of the gas engine and electric motor.
In contrast, other hybrid technologies areWhen the RX 400h is coasting or the brakes
not capable of running only on electricalare applied, the electric motors function as
power, but instead require constant gasgenerators, capturing kinetic energy that
engine  operation.would normally be lost as heat through the
brakes and transforming it into useable
In making the transition to a hybrid powerelectricity to recharge the batteries. This
train, the alternator, power steering pump,regenerative braking system further boosts
water pump and AC compressor are no longersystem efficiency.



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