US 20060201730A1
(19) United States
(12) Patent Application Publication (10) Pub. No.: US 2006/0201730 A1
(43) Pub. Date:
Kaneko et al.
(54)
ELECTRIC FOUR-WHEEL DRIVE VEHICLE
AND CONTROL UNIT FOR SAME
(30)
Foreign Application Priority Data
Mar. 14, 2005
(75) Inventors: Satoru Kaneko, Naka (JP); Tatsuyuki
Hitachinaka (JP); Kenta Katsuhama,
Hitachinaka (JP)
(51)
Int. Cl.
B60K 17/356
(52)
Us. or.
(57)
Correspondence Address:
CROWELL & MORING LLP
INTELLECTUAL PROPERTY GROUP
P.O. BOX 14300
WASHINGTON, DC 20044-4300 (US)
(JP) .................................... .. 2005-070919
Publication Classi?cation
Yamamoto, Mito (JP); Masaru Ito,
Hitachinaka (JP); Hisaya Shimizu,
Sep. 14, 2006
(2006.01)
............................................................ .. 180/243
ABSTRACT
An electric four-Wheel drive vehicle and a control unit for
the same, Which can be applied to cars of class having larger
displacements than the class to Which the electric four-Wheel
drive vehicle equipped With the DC motor is applied,
Without increasing the cost over that of the known mechani
cal four-Wheel drive vehicle. Front Wheels of the vehicle are
driven by an engine, and rear Wheels are driven by an AC
(73) Assignee: Hitachi, Ltd., Chiyoda-ku (JP)
motor. A generator is driven by a rotating force of the engine
(21) Appl. No.:
outputted from the generator to AC poWer. A control unit
controls the generator such that energy Pm required for
driving the AC motor is outputted from the generator.
(22)
Filed:
11/352,259
Feb. 13, 2006
to output DC poWer. An inverter converts the DC poWer
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Patent Application Publication Sep. 14, 2006 Sheet 1 0f 21
US 2006/0201730 A1
FIG.1
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Patent Application Publication Sep. 14, 2006 Sheet 2 0f 21
US 2006/0201730 A1
FIG.2
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F I G. 5
OALGOLATE DEVI ATION AVdc BETWEEN THE
CAPACITOR VOLTAGE COMMAND VALUE Vdc* f 31 0
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VOLTAGE Vdc AND H ELD VOLTAGE COMMAND Vgf*
Patent Application Publication Sep. 14, 2006 Sheet 6 0f 21
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Patent Application Publication Sep. 14, 2006 Sheet 11 0f 21
US 2006/0201730 A1
F IG. 1 3
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COMPUTE MOTOR TORQUE Tmreq \#8200
REQU I RED FOR FOUR-WHEEL
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INCREASE ENGINE ROTATION SPEED @5280
DECIDE FINAL MOTOR DRIVE
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Patent Application Publication Sep. 14, 2006 Sheet 12 0f 21
US 2006/0201730 A1
FIG.14
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Patent Application Publication Sep. 14, 2006 Sheet 13 0f 21
US 2006/0201730 A1
FIG.15
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Patent Application Publication Sep. 14, 2006 Sheet 14 0f 21
US 2006/0201730 A1
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Patent Application Publication Sep. 14, 2006 Sheet 15 0f 21
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US 2006/0201730 A1
Patent Application Publication Sep. 14, 2006 Sheet 16 0f 21
US 2006/0201730 A1
FIG.19
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US 2006/0201730 A1
Patent Application Publication Sep. 14, 2006 Sheet 18 0f 21
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Patent Application Publication Sep. 14, 2006 Sheet 19 0f 21
US 2006/0201730 A1
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