Prius 4 Presentation Shunsuke Fushiki
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Transcript of Prius 4 Presentation Shunsuke Fushiki
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Shunsuke FushikiHybrid Vehicle Engineering Management Div.
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First generation Prius
Second generation Prius
Current Prius
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Low fuel consumption
Hybrid system The new hybrid effect
Emotionaldriving
experience
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High efficiency Compact andlightweight system
Excellent environmentalperformance
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Fuel Efficiency Gains Achieved with the New Hybrid System
(km/ )ℓ
Fuel
con
sum
ptio
n m
easu
red
usin
g th
e Ja
pane
se J
C08
cyc
le
Current Prius
New Prius
5.0%
Engine
2.6%
Transaxle
3.2%
Motor
2.4%
PCU
5.0%
Hybrid batteryHybrid system management
Vehicle
40km/ℓTarget
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Max
imum
ther
mal
effi
cien
cy
Firstgeneration
Prius1NZ-FXE
Secondgeneration
Prius1NZ-FXE
38.5%
Current Prius2ZR-FXE
New Prius2ZR-FXE40%
(%)
(Year)1995 2000 2005 20152010
45
40
35
30
: Toyota gasoline engines : Competitors’ gasoline engines
Improvements to maximum thermal efficiency of engines over time
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Reduced friction
Toyota-first dual cooling system
Improved combustion and knock control
Maximum Thermal Efficiency of 2ZR-FXE Engine: 40%
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Power split device
Motor
Parallel motor reduction gear format
Generator
Mechanical loss reduced by approx. 20%
Length reduced by 47 mm
New Multi-Axis Transaxle
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Loss reduced by over 20%
Weight reduced by over 20%
Compact and Lightweight High-Output Motor
Development of rolling-coil structure
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Loss reduced by approx. 20%
Size reduced by 33%
Auxiliary battery moved to engine compartment
Engine
Auxiliary battery
Upper cover
Inverter case
Smoothing capacitor
Converter case
Lower cover
Control circuit
Current sensor
Power stack(cooler and power cards)
Reactor
DC/DCconverter
PCU
Newly Developed PCU
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Newly Developed Nickel-Metal Hydride Battery
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0
0.20
0.40
0.60
0.80
1.00
1.20
1.40
30
32
34
36
38
40
Batte
ry v
olum
e
( )ℓ
Size reduced by 10%
10%
35.539.4 1.281.00
28%
Current Prius New Prius Current Prius New PriusNote: assuming a battery temperature of 25℃
Newly Developed Nickel-Metal Hydride Battery
Charging performance improved by 28%
Amou
nt c
harg
ed p
er u
nit o
f tim
e
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Improved output
Newly Developed Lithium-Ion Battery
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+110mm
-55mm
Luggage area502 ℓ(+56 )ℓ
Battery
Current Prius New Prius
Luggage area capacityℓ56 increased by
NiMH & Li-ion
Relocated Battery
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Vehicle speed(km/h)
Time
(rpm)
Engine speed
Higher frequency of engine stops
Higher Engine Stop Speed
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Engine
Transaxle
Hybrid battery
PCU
Motor
4%
28%
13% 16% 13%
26%
Hybrid system management
Per-unit Contribution to Improvement in Fuel Efficiency
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Rear transaxleRear motor
Rear inverter
Hybrid battery(also on 2WD models)
New E-Four System
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TimeRear-wheel
torque
Setting off and
accelerating
Standard driving
patterns
Slippery surfaces
(snow, etc.)Deceleration
New E-Four Driving Mode
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More Enjoyable Driving Experience with the New Hybrid System
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Key elements of an enjoyable driving
experience
Peace of mind
Smooth driving experience
Light, responsivedrive
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Highway on-ramp
Driving in residential areas
Smooth driving experience
Peace of mind
Light, responsive drive
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Peace of mind
Smooth driving experience
Light, responsivedrivePeace of mind Light, responsivedrive
Key elements of an enjoyable driving
experience
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Acce
lera
tion
Accelerator pedal stroke
Power mode
Normal mode
New eco-mode (equivalent to current model’s normal mode)
Region emphasizing enjoyableacceleration performance
Smooth Acceleration
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Peace of mind
Smooth driving experience
Light, responsivedrive
Smooth driving experience
Light, responsivedrive
Key elements of an enjoyable driving
experience
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Current Prius
Pitch Excessive
New Prius
Acceleration (G)
Vehicle pitches unstably.
PitchMinimized
Minimizing Pitch when Accelerating from Start
Acceleration (G)
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Key elements of an enjoyable driving
experience
Peace of mind
Smooth driving experience
Light, responsivedrivePeace of mind
Smooth driving experience
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6 80 2
Engi
ne s
peed
4 10 12 14
Time
New PriusCurrent Prius
Responsive and Linear Acceleration
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Sports driving conditionsNormal driving conditions
Ahead
Behind
Left Right
New Driving System
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Engine speed needsAc
cele
ratio
n Vehicle speed
Improves acceleration in line with the driver’s needs
Engine braking needs
Controls engine braking in line with the driver’s needs
Dec
eler
atio
n
Vehicle speed
Sharp
Improved responsiveness
New Driving System
(m/s )2 (m/s )2
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Targeted fuel efficiency of 40 km/ℓ
Fun to drive
Compact and lightweight system
New Hybrid System
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Beautiful Hybrid
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