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1. 发明专利

DE60043864D1 未知
公开(公告)号：DE60043864D1
公开(公告)日：2010-04-01
申请号：DE60043864
申请日：2000-09-05
申请人： HITACHI LTD
发明人： SAKAI KEIJIRO , OKUYAMA TOSHIAKI , FUJII HIROSHI
IPC分类号： H02P27/04 , H02P21/00 , H02P21/14 , H02P21/18 , H02P21/22 , H02P21/24 , H02P23/07

2. 发明专利

DE60036501T2 未知
公开(公告)号：DE60036501T2
公开(公告)日：2008-06-19
申请号：DE60036501
申请日：2000-03-16
申请人： HITACHI LTD
发明人： MIYAJIMA AYUMU , OKAMOTO YOSHIO , KADOMUKAI YUZO , TOGASHI SHIGENORI , AMO KIYOSHI , YAMAKADO MAKOTO , ISHIKAWA TOHRU , KUBO HIROMASA , FUJII HIROSHI
IPC分类号： F02B23/10 , F02M61/18 , F02B3/00 , F02B17/00 , F02B75/12 , F02M51/06 , F02M61/14 , F02M61/16 , F02M69/04

3. 发明专利

DE60024222T2 未知
公开(公告)号：DE60024222T2
公开(公告)日：2006-08-03
申请号：DE60024222
申请日：2000-09-04
申请人： HITACHI LTD
发明人： SAKAMOTO KIYOSHI , ENDOU TSUNEHIRO , TAKAHASHI NAOHIKO , MIURA HARUO , FUJII HIROSHI
IPC分类号： H02P21/14 , H02P6/06 , H02P6/08 , H02P6/18 , H02P6/182 , H02P6/28 , H02P21/00 , H02P21/06 , H02P21/08 , H02P21/09 , H02P21/13 , H02P21/18 , H02P21/22 , H02P21/24 , H02P21/26 , H02P21/28 , H02P23/12 , H02P23/14 , H02P27/04 , H02P27/06 , H02P27/08

4. 发明专利

DE60117382D1 未知
公开(公告)号：DE60117382D1
公开(公告)日：2006-04-27
申请号：DE60117382
申请日：2001-07-02
申请人： HITACHI LTD
发明人： YAMAGUCHI JUN ICHI , TANABE YOSHIYUKI , ONISHI KOJI , ISHII TOSHIO , FUJII HIROSHI
IPC分类号： F02D41/40 , F02B23/08 , F02B23/10 , F02B75/12 , F02D37/02 , F02D41/02 , F02D41/30 , F02F1/24 , F02M45/00 , F02M45/08 , F02M61/18 , F02M69/04 , F02P15/02 , F02P15/08
摘要： A cylinder direct injection type internal combustion engine directly injecting fuel in a cylinder (104) and igniting the fuel-air mixture formed in the cylinder, wherein an advance spray with high fuel flow velocity (105) and a main spray with low fuel flow velocity (106) are injected, the advance spray is injected toward an ignition plug (114), and the fuel-air mixture formed of the advance spray and main spray is ignited a plurality of times depending on the operating conditions of the internal combustion engine.

5. 发明专利

AU2003262235A1 SPARK IGNITION ENGINE AND METHOD OF CONTROLLING COMBUSTION OF THE ENGINE 未知
公开(公告)号：AU2003262235A1
公开(公告)日：2005-03-07
申请号：AU2003262235
申请日：2003-08-15
申请人： HITACHI LTD
发明人： SUKEGAWA YOSHIHIRO , TOKUYASU NOBORU , YAMAGUCHI JUNICHI , FUJII HIROSHI
IPC分类号： F01N3/28 , F01N13/08 , F02M61/18 , F02P5/15 , F02D43/00 , F02D41/02 , F02D41/04
摘要： In warming up operation when the temperature of an engine is low, heat release in a combustion chamber is delayed by making ignition timing immediately before the top dead center of compression stroke or later. Hereby, exhaust gas including a large quantity of unburned HC, oxygen and carbon monoxide is exhausted into an exhaust passage. Then, the mixture of the HC, oxygen and carbon monoxide is accelerated by a turbulence generating means for generating turbulence in an exhaust flow mounted in the exhaust passage. Hereby, the HC is combusted in the exhaust passage, exhaust temperature is raised, resulting in that effective reduction of the HC. As the exhaust temperature is raised, it can activate earlier a catalytic converter for purifying exhaust.

6. 发明专利

DE10142053A1 未知
公开(公告)号：DE10142053A1
公开(公告)日：2002-12-05
申请号：DE10142053
申请日：2001-08-28
申请人： HITACHI LTD
发明人： ISHIDA SEIJI , SAKAI KEIJIRO , OKUYAMA TOSHIAKI , FUJII HIROSHI , TOMITA HIROYUKI , ANDO TATSUO , TAKAKURA YUHACHI , KIMURA HIDEO
IPC分类号： H02M7/48 , H03K7/08 , H02M1/08 , H02M5/44 , H02P7/63

7. 发明专利

DE69306703D1 未知
公开(公告)号：DE69306703D1
公开(公告)日：1997-01-30
申请号：DE69306703
申请日：1993-09-07
申请人： HITACHI LTD
发明人： SAKAI KEIJIRO , ENDO TSUNEHIRO , OKUYAMA TOSHIAKI , FUJII HIROSHI
IPC分类号： H02P21/00 , H02P21/04 , H02P21/14 , H02P5/40 , G01R31/34
摘要： An inverter (4) corrects an output voltage by the magnitude of output voltage error due to a dead time and an ON-state voltage drop in power elements to energize an AC motor (5) in a manner of single phase alternating current excitation, calculating an active component of current Iq and a reactive component of current Id from the phase theta of an excitation voltage vector and a detected instantaneous current value iu, measuring characteristic constants of the motor, a combined resistance ( r1 + r2 ) and a combined leakage inductance ( l1 + l2 ) from an excitation voltage command value Vc1, Id and Iq. The measured values are used as the control constants for a speed sensorless vector control (7). Further, the resistances r1, r2, and a self-inductance L1 which are control constants can be obtained based on the component in a primary voltage vector direction of a primary current vector Iq' and the component pi /2 delayed from the primary voltage vector direction of the primary current vector Id'. According to the present invention, the characteristic constants can accurately be measured without any inverter output voltage sensor.

8. 发明专利

DE69020014D1 未知
公开(公告)号：DE69020014D1
公开(公告)日：1995-07-20
申请号：DE69020014
申请日：1990-02-06
申请人： HITACHI LTD
发明人： IBORI SATOSHI , BABA SHIGEYUKI , FUJII HIROSHI , KANBARA TAKATSUGU , NANDOH KENJI
IPC分类号： H02H7/12 , H03K3/0233 , H03K3/42 , H03K17/08 , H03K17/0812 , H02H7/20
摘要： This specification discloses an overcurrent protective circuit for detecting an overcurrent flowing through an electrostatic self-turn-off device (1) and suppressing the overcurrent. The overcurrent protective circuit according to the present invention comprises a power source (E1) for supplying a driving voltage to said electrostatic self-turn-off device (1) to turn on the device (1), a switching circuit (Q2) for performing on-off control of the driving voltage to give a driving signal to the self-turn-off device (1), and a circuit for detecting the voltage of the driving control terminal (G) and holding the potential of the driving control terminal (G) below the driving voltage in response to the reaching of the detected voltage to a predetermined value.

9. 发明专利

DE68920968T2 未知
公开(公告)号：DE68920968T2
公开(公告)日：1995-05-24
申请号：DE68920968
申请日：1989-11-28
申请人： HITACHI LTD
发明人： MUTOH NOBUYOSHI , SAKAI KEIJIRO , FUJII HIROSHI , NANTOH KENJI
IPC分类号： H02M7/48 , H02P21/00 , H02P21/05 , H02P23/04 , H02P27/04 , H02P27/06 , H02P27/08 , H02P27/12 , H02P7/628
摘要： In spatial vector control of a pulse width modulation (PWM) inverter (40) adapted for variable speed drive of an induction motor (50), a difference vector ( @(n)) between magnetic flux vectors ( @(n), @(n-1))occurring during adjacent sampling periods is generated by synthesizing a zero vector ( @0, @7) and voltage vectors ( @1 SIMILAR @6) in such a manner that a resultant voltage vector always includes as component a minimum unit of zero vector or voltage vector, whereby even when the angular speed of rotation of the magnetic flux changes, the switching frequency of the PWM inverter is prevented from decreasing and the current ripple is reduced.

10. 发明专利

DE68913378D1 未知
公开(公告)号：DE68913378D1
公开(公告)日：1994-04-07
申请号：DE68913378
申请日：1989-07-18
申请人： HITACHI LTD
发明人： MUTOH NOBUYOSHI , SAKAI KEIJIRO , UEDA AKITERU , FUJII HIROSHI
IPC分类号： H02M7/48 , H02M7/529 , H02P21/00 , H02P21/05 , H02P21/14 , H02P23/04 , H02P23/07 , H02P27/04 , H02P27/08
摘要： Disclosed is a PWM inverter apparatus used for driving an a.c. motor, comprising: an inverter including an output part connected to the a.c. motor and switching elements on-off controlled by a PWM signal; a part (10) for receiving, at an interval of a given sampling period, status command information specifying a desired status of a vector of a rotating magnetic flux in the a.c. motor; a part (10) for predicting, on the basis of at least the status command information received at each sampling time, the status of the vector of the rotating magnetic flux which will be produced at next sampling time; a part (22) for calculating the difference between the status of the vector of the rotating magnetic flux specified by the status command information received at current sampling time and the predicted status of the vector of the rotating magnetic flux which will be produced at next sampling time; a part (21, 23, 24) for synthesizing the difference vector using ones selected from among a plurality of predetermined reference voltage vectors; and a part (30) for generating a PWM signal for controlling the switching elements of the inverter so as to produce the selected reference voltage vectors.

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