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DRIVING A LEXUS HYBRID |
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Main Components of the Lexus
Hybrid Drive System
Here are the major
components that make up the Lexus Hybrid
Drive (LHD) system:
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Engine: The primary power
source for your vehicle, the engine
works in conjunction with the hybrid
battery to deliver power to the
Electronically controlled Continuously
Variable Transmission (ECVT).
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Electronically Controlled Continuously
Variable Transmission (ECVT): Delivers
smooth acceleration without conventional
gear shifting, while enhancing
efficiency. The advanced application of
the electric motor/generators, power
split device and reduction device helps
optimize available performance and
economy: – Electric Start
Motor/Generator (MG1): Acts primarily as
a generator by producing power to
re-charge the hybrid battery and provide
power to Electric Drive Motor/Generator
(MG2) during acceleration. When acting
as a motor, MG 1 starts the engine. –
Electric Drive Motor/Generator (MG2):
Provides power to the rear wheels and
generates power during braking to
re-charge the hybrid battery. – Power
Split Device: Forward planetary gear set
that splits engine power between the
rear wheels and MG1. Distributes 70% of
engine torque to the output axle and 30%
to MG1 to power MG2 or recharge the
hybrid battery. – Dual-Range Motor
Reduction Device: Special feature in the
transmission that varies the
deceleration ratio in two stages by
controlling a planetary gear and two wet
brakes. As a result, it provides maximum
driving power and can handle high-speed
performance while contributing to
improved fuel economy.
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Power
Inverter Assembly: Converts the hybrid
battery’ s high voltage DC current into
AC current for the electric motors and
vice versa, depending on driving demands
and electrical system. The inverter can
also boost the hybrid battery’s power
from 288 volts up to 650 volts as needed
for maximum power.
Hybrid
Battery: Composed of sealed nickel-metal
hydride modules, the hybrid battery
supplies power to the power inverter for
use by the electric motors, air
conditioning and power steering. During
coasting and braking conditions, it
stores regenerative energy captured by
the electric motors.
Hybrid Electronic
Control Unit (ECU): Monitors and
controls the power flow between all key
components of the hybrid systems
(engine, motors, battery, etc.) to
ensure optimum performance and
efficiency. Additional features (not
shown) include the following:
Rear-Mounted Electric
Motor/Generator (MGR) (RX 400h
all-wheel-drive models): Provides
additional power to the rear wheels
under heavy acceleration. It is driven
by electrical power from MG1 and/or the
battery. During braking or deceleration,
it generates electricity to recharge the
hybrid battery.
Regenerative Braking
System: Helps recover energy used to
slow the vehicle during braking or
coasting. The conventional hydraulic
brake system and the regenerative brake
system work in conjunction with each
other.
12-Volt Battery:
Enables the vehicle’s Electronic Control
Unit to “start” the vehicle (i.e.,
“READY” mode) and operates the basic
electrical system. This battery is
charged by the power inverter assembly.
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Driving a
Hybrid is
not very much different from driving a
conventional vehicle. As you start driving
your vehicle, here are some differences you
should know about. |
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To start your vehicle press and hold the
brake pedal, then press the “POWER”
button. After a few seconds, the "READY"
light in the center of the instrument
cluster will come on. Once the "READY"
light comes on, place the transmission
lever into the desired position and
start driving. When accelerating slowly,
the vehicle can drive at low speeds on
electric power alone, so the gasoline
engine may not start for a while
depending upon the need.
The engine will
automatically turn on and off as needed.
At low speeds or when stopped, the
engine may or may not be on, depending
on the need. At medium or high speeds,
it is normal for the engine to be on
most of the time.
The
transmission may feel different.
Lexus hybrids use an
Electronically-controlled Continuously
Variable Transmission (ECVT). The
transmission does not shift with fixed
gear ratios like a conventional
transmission, so it delivers power
efficiently and smoothly.
The brakes may
feel different.
Lexus hybrids feature an advanced,
electronically-controlled brake-by-wire
system. This system controls both the
regenerative braking system and the
conventional braking system. As a
result, the brakes may feel different
from a conventional vehicle.
You may notice
different sounds while driving.
The engine sound will be more steady
than a conventional vehicle when
accelerating due to the smooth operation
of the ECVT. It is also normal for the
new technology of the Lexus Hybrid Drive
to make a "whirring" sound while
driving.
CAUTION:
While driving a
hybrid vehicle, pay special attention to the
area around the vehicle. Because there is
little vehicle noise in electric-only mode,
pedestrians, people riding bicycles or other
people and vehicles in the areaway not be
aware of the vehicle starting off or
approaching them, so take extra care while
driving.
To properly operate the vehicle, these
basic tips are important: 1. Press and
hold the brake pedal, then press the
“POWER” button. 2. Begin driving when
“READY” light stays on. 3. The engine
will automatically turn on and off.
When refueling,
the fuel doorway take a few moments to
open.
As part of emissions system operation,
it may take up to 15 seconds for the
fuel door to automatically release after
the release button is pressed. TheMulti-information
Display in the instrument cluster will
display "Refuel Ready" when the door
releases.
Lexus hybrid
vehicles are not designed to be operated
with the fuel tank empty.
Do not run your vehicle out of fuel or
continue to drive with the fuel tank
empty. If you run out of fuel,
immediately pull over to a safe location
and turn off the vehicle. Be sure to add
fuel before attempting to restart the
vehicle or continuing to drive.
Keep the Hybrid
Battery cooling vents clear.
Do not block the hybrid battery cooling
vents in the rear area of the interior
with any items. Doing so could cause
overheating of the hybrid battery.
Maintaining
charge for your 12-volt Battery.
Drive your vehicle at least weekly.
Operate accessories with vehicle in
“READY” mode. When parking, make sure
doors and trunk are closed and lights
are turned off.
Maintaining
charge for your Hybrid Battery.
For parking longer than about 30
days, charging of the 12-volt battery
may be required. Your Lexus dealer has
details. To keep the hybrid battery in
good condition, drive the vehicle at
least once every several months for at
least 30 minutes or ten miles. If the
hybrid battery becomes fully discharged
and the vehicle will not start, even
with a jump start to the 12-volt
battery, contact your Lexus dealer.
Transmission “D”range
The “D” transmission range is used for
normal driving. Only use the "S*" or
“B*” transmission ranges if needed to
help maintain vehicle speed when going
down steep grades. In “S” mode, the
lower the range, the greater the engine
braking force.
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Additional Hybrid
system driving settings:
"PWR*” switch Set to "PWR" for increased
responsiveness. Once set, it will remain in
this mode.
“ECO*” switch
Set to “ECO*” for
improving fuel economy. Both the vehicle
driving force and operation of the air
conditioning system are controlled to
improve fuel efficiency.
“SNOW*” switch Set to “SNOW*” for more
controlled acceleration on slippery
surfaces. It will remain in this mode until
the vehicle is turned off.
“EV*” switch In EV drive mode, the electric
motor, powered by the hybrid battery, is
used to drive the vehicle. This mode allows
you to drive without concern for gas
emissions. It may not be possible to select
EV drive mode in the following situations:
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The temperature of
the hybrid system is low or high, or if
the engine is warming up.
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The hybrid battery is
low (level 2 or less).
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Vehicle speed is
about 19 mph or more.
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The accelerator pedal
is depressed firmly or the vehicle is on
a hill, etc.
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The windshield
defogger is in use.
Possible driving distance
is up to about several hundred yards at low
speeds. This may also depend on the hybrid
battery level and driving conditions. Notes:
If “EV” mode cannot be turned on, a buzzer
will sound and a message will be shown on
the multi-information display. Operating the
vehicle in EV mode will not increase overall
fuel economy.
* If equipped. |
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