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1. 发明专利

JPH0767396A GENERATED VOLTAGE REGULATOR FOR AUTOMOBILE 失效
公开(公告)号：JPH0767396A
公开(公告)日：1995-03-10
申请号：JP21441093
申请日：1993-08-30
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： WATANABE KENICHI , MAEDA YUJI , HIKITA SAKAE
IPC分类号： B60R16/02 , B60R16/03 , H02J7/14 , H02J7/24 , H02P9/02 , H02P9/04 , H02P9/30
摘要： PURPOSE:To achieve a generated voltage regulator which can positively detect the ON state of a key switch without being affected by the change, etc., of an ambient temperature. CONSTITUTION:When the power generation of a generation circuit 12 is improper, a power MOSFET 111 is turned on and off periodically and a charge lamp 3 is lit. The ON/OFF of the MOSFET 111 is detected by a detection part 1121 of a voltage detection circuit 112. A retention part 1122 sets an output signal c to 'H' level for a certain amount of time when ON signal is supplied from the detection part 1121, thus preventing a key switch 2 from being judged to be off even if the MOSFET 111 is turned on and maintaining the ON state of a switch 116, thus applying the power MOSFET 111 which has a low-level voltage between drain and source when it is on but is compact and light and has a small heat build-up operation as a switching means for lighting a charge lamp, positively detecting the ON state of the key switch regardless of the ambient temperature etc., and hence achieving a compact and light weight generated voltage regulator.

2. 发明专利

JPH06311799A CONTROL SYSTEM FOR AC GENERATOR DRIVEN BY INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06311799A
公开(公告)日：1994-11-04
申请号：JP1145994
申请日：1994-02-03
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HIKITA SAKAE , MAEDA YUJI , FUJISHITA MASAKATSU , SATO MASAHIRO , KAWASAKI SEIICHI , EBISAWA TAKAYUKI
IPC分类号： H02J7/16 , H02P9/14
摘要： PURPOSE:To stabilize power performance of an internal combustion engine by always correcting a generated voltage command value in response to an operating state of the engine. CONSTITUTION:Pieces of information such as an engine speed Ne, an engine water temperature TW, a throttle opening theta, an engine intake air amount Q, etc, of parameters of an internal combustion engine are input to an arithmetic processor 8. An electric load state and a vehicle traveling state are load- identified from the conditions. Thereafter, a target generated voltage for controlling an output of a generator 3 is so set as to become optimum for a vehicle state according to the load identified state. These processes are calculated in the processor 8, and a generated voltage command value P corresponding to the target generated voltage is output to a field current controller 5, thereby controlling a storage battery voltage in the generator 3 to a target generated voltage. In this case, the processor 8 detects a voltage difference between the battery voltage and the target voltage, thereby correcting the value P by the difference.

3. 发明专利

JPH0622471A CONTROLLER OF GENERATOR FOR VEHICLE 失效
公开(公告)号：JPH0622471A
公开(公告)日：1994-01-28
申请号：JP17710092
申请日：1992-07-03
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： MASUMOTO MASATOSHI , TAKAHASHI NAOYUKI , MAEDA YUJI , KOKUBU SHUICHI
IPC分类号： H02J7/24 , H02P9/30
摘要： PURPOSE:To provide a controller of a generator for a vehicle in which a current limit value at the time of operating a torque limiter for limiting a field current to a set value can be accurately obtained. CONSTITUTION:The controller of a generator for a vehicle comprises a latching circuit 20 for outputting an output of a current detector 19 in synchronization with a clock CLK from a triangular wave generator 17 of a PWM (pulse-width- modulation) voltage controller 25 so that a switching frequency of a power transistor 12 for turning field current ON, OFF does not become a PWM frequency or more of a voltage control system. Thus, since drive torque required by a generator 1 can be effectively suppressed to a set value even at the time of a cold temperature, a life of a belt for driving a generator can be improved while obtaining an original output of the generator 1 at the time of a high temperature, squeaking of the belt is suppressed, and stalling of an engine can be prevented.

4. 发明专利

JPH04322134A FIELD CONTROLLER FOR CHANGING GENERATOR 失效
公开(公告)号：JPH04322134A
公开(公告)日：1992-11-12
申请号：JP9193591
申请日：1991-04-23
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KURIYAMA SHIGERU , MAEDA YUJI , NAKAMURA KENICHI , HIKITA SAKAE
IPC分类号： H02J7/16 , H02J7/24 , H02P9/30
摘要： PURPOSE:To prevent battery voltage drop during low speed rotation by boosting the charges absorbed by a capacitor in a circuit for feeding a current to a field coil of a vehicle charging generator and then discharging to the field coil. CONSTITUTION:An alternator 4 is connected with a battery 1. A booster circuit is constituted of an inductor L1, diodes in FET1 and FET2 and a capacitor C1. A discharge circuit is constituted of the C1, diodes of the FET1 and FET2 and the L1. The CL is subjected to chopping at a frequency of several tens kHz with signals 1, 2 fed from an electronic circuit 11 thus boosting the terminal voltage of the C1. Upon turn ON of FET3 with a signal 3, the C1 is discharged through a diode D1 to a field coil 5. Generating current is absorbed by C1 upon increase of torque while CL is discharged upon decrease of torque to reduce the generating current thus controlling the torque of alternator. Consequently, battery voltage drop is prevented during low speed rotation.

5. 发明专利

JPH0654464A CONTROLLER OF CHARGING GENERATOR FOR VEHICLE 失效
公开(公告)号：JPH0654464A
公开(公告)日：1994-02-25
申请号：JP4093093
申请日：1993-03-02
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TAKAHASHI NAOYUKI , MAEDA YUJI , MASUMOTO MASATOSHI , SUGAYA ATSUSHI
IPC分类号： H02J7/16 , H02J7/24 , H02P9/30
摘要： PURPOSE:To accurately control the output voltage by selecting the side where the output voltage is low for the control signal of a power switch for field current control out of the deviation partial-pressure output being sought from the deviation signal between the output of a battery or a generator and the preset voltage and the integration output. CONSTITUTION:The difference with the preset voltage 12 is sought with a deviation signal output circuit 13 by detecting 11 the DC voltage from a generator or the output voltage of a battery. The deviation signal is integrated 14 as it is and is outputted, and it is inputted into the + terminal of a comparator 17, and also the potential is divided 15 and it is inputted into the + terminal of a comparator 18. The output of a toothed signal generation circuit 16 is inputted as the common reference voltage to the-terminals of the comparators 17 and 18. The output voltages 17a and 18a of the comparators 17 and 18 are inputted into the AND circuit 19, and the lower side is selected, and a MOS-FET 20, which forms a power switch, is turned on or turned off, whereby the field current of a generator is controlled. Hereby, a field current answers instantaneously even at low-voltage load, whereby the output voltage of the generator is controlled accurately.

6. 发明专利

JPH0638398A SYSTEM FOR CONTROLLING POWER GENERATION OF ON-VEHICLE AC GENERATOR 失效
公开(公告)号：JPH0638398A
公开(公告)日：1994-02-10
申请号：JP18655392
申请日：1992-07-14
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HIKITA SAKAE , MAEDA YUJI
IPC分类号： H02J7/16
摘要： PURPOSE:To reduce negative factors to the engine torque of an internal combustion engine of a vehicle by controlling the adjusting voltage of an AC on-vehicle generator by using a signal obtained by taking into account the information about the vehicle, etc., from the outside. CONSTITUTION:The control system is provided with an AC generator 1 which is rotated by means of an internal combustion engine and the output power of which is changed by controlling its field current and a battery 2 which is charged by the power generated by the generator l. The control system is also provided with a detecting means which detects one or more of the operating state, mechanical load, electric load 3, and charged state of the battery 2 and signal generating means 41 which generates a signal in accordance with the value detected by the detecting means. In addition, the control system is also provided with an external control means 4 which controls the field current of the generator 1 based on a signal outputted from the means 41. Especially, the control system can appropriately control the charging of an on-vehicle battery by detecting the operating state and loading state of the battery.

7. 发明专利

JPS63302305A ROTATION ANGLE DETECTOR 失效
公开(公告)号：JPS63302305A
公开(公告)日：1988-12-09
申请号：JP13809887
申请日：1987-06-03
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HASEGAWA AKIRA , MAEDA YUJI
IPC分类号： G01D5/30 , G01B11/00
摘要： PURPOSE:To obtain a detector small with high resolutions free from effect of a high temperature and electromagnetic noise, by inserting an optical fiber between a light emitting element and a photodetector and a rotary disc as separated therefrom. CONSTITUTION:An optical fiber is inserted between light emitting element and photodetector 76 and 78 and a disc 32 as separated therefrom 76 and 78. In other words, light radiated from the light emitting element 76 is introduced near the disc 32 with a first optical fiber 54 to irradiate the disc 32 with light emitted at an end face of the fiber 54. The reflected light from the disc 32 is introduced with second optical fibers 56a-56f to the photodetector 78. On the other hand, light emitted from the optical fiber 54 expands and hits the disc 32 based on numerical aperture determined by refractive indexes of a core and a clad composing the optical fiber. The reflected light expands more than doubling the angle of expansion of the emitted light toward the optical fibers 56a-56f. To receive the reflected light efficiently, the fiber 54 is selected in a smaller numerical aperture while the optical fibers 56a-56f in a larger numerical aperture.

8. 发明专利

JPH0746898A CHARGING GENERATOR FOR VEHICLE 失效
公开(公告)号：JPH0746898A
公开(公告)日：1995-02-14
申请号：JP19448993
申请日：1993-08-05
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： MAEDA YUJI , WATANABE KENICHI , HIKITA SAKAE
IPC分类号： H02J7/14 , H02J7/16 , H02J7/24 , H02P9/04 , H02P9/14
摘要： PURPOSE:To exhibit alarm function, external control function, and load response function sufficiently by imposing inhibition conditions to load response control. CONSTITUTION:In a rotation detecting circuit 21, output voltage of one phase of a generator, i.e., a signal at terminal P, is shaped by a shaper circuit 211 and the period thereof is measured by a period measuring circuit 213 thus detecting the r.p.m. A charge lamp is lighted when an engine stops with a key switch being turned ON and a charge lamp unlight signal 21A is generated when the stator begins to rotate and the r.p.m. rises abruptly after initial explosion. At that time, a load response inhibition signal 21B is also generated for a predetermined time. Since the load response control is inhibited for a predetermined time after initial explosion, the battery voltage does not drop resulting in a positive engine start.

9. 发明专利

JPH04168933A CONTROLLER FOR CHARGING GENERATOR 失效
公开(公告)号：JPH04168933A
公开(公告)日：1992-06-17
申请号：JP29203490
申请日：1990-10-31
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： NAKAMURA KENICHI , MAEDA YUJI , HOSHI KIMIO , MASUNO KEIICHI , HIKITA SAKAE
IPC分类号： H02J7/24
摘要： PURPOSE:To perform generation control while taking account of the influence of generator onto an internal-combustion engine by actuating the generator when the internal-combustion engine moved to some rotary position, detecting the battery voltage and stopping the operation of the generator. CONSTITUTION:A crank angle sensor is employed as means for detecting the rotary position of an internal-combustion engine and the sensor detects signals outputted from cylinders TDC with a predetermined rotary angle. A generation controller is operated based on thus detected signals to control power generation of a generator so that the generator is operated and stopped with same period as the fluctuation of the rotational speed. Consequently, absorbing torque of the generator varies with same period and thereby the rotational speed can be measured while previously taking account of the influence of the absorbing torque.

10. 发明专利

JPH07184330A CHARGING GENERATOR WITH SELF-DIAGNOSIS FUNCTION 失效
公开(公告)号：JPH07184330A
公开(公告)日：1995-07-21
申请号：JP32660393
申请日：1993-12-24
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TAKAMOTO NOBUO , MAEDA YUJI , HIKITA SAKAE , MARUMOTO KATSUJI
IPC分类号： H02J7/14 , H02J7/24 , H02P9/00 , H02P9/14
摘要： PURPOSE:To support the confirmation of failure generation and tracing of possible causes by storing at least one of the data and contents of some failure at the time of detecting the failure, and reading it as necessary. CONSTITUTION:When an on-vehicle generator 1 is started by turning on an engine key 4, a field winding 13 is excited, and an armature winding 11 generates three-phase a.c. current. The a.c. current is converted to d.c. by a full-wave rectifier 12 to excite the field winding 13 and charge a battery 5. A voltage regulator 2 is provided with a control part 25 to conduct various types of control. A diagnosis part 26 is also mounted to hold at least one of the data and contents of some failure. When a particular signal is inputted from an external terminal 27 as necessary, the data and contents of failure held by the diagnosis part 26 are read out to be displayed on a display device 7 and inputted in a personal computer 9. It is thus possible to conduct exact self-diagnosis and make a person in charge of maintenance or development utilize it effectively.

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