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21. 发明专利

JPH09312555A CONTROLLER FOR SWITCHING CIRCUIT AND INVERTER 失效
公开(公告)号：JPH09312555A
公开(公告)日：1997-12-02
申请号：JP12944196
申请日：1996-05-24
申请人： HITACHI LTD
发明人： YAMAMURA HIROHISA , HACHIMAN KOICHI
IPC分类号： H02M7/48 , H03K17/08
摘要： PROBLEM TO BE SOLVED: To obtain an inverter with high accuracy, high reliability and whose fault is diagnosed at a high speed by detecting and using an information signal at a period other than a noise production period of the inverter. SOLUTION: A mask circuit 6 masks an information signal representing a state amount of the inverter 50 required to generate a control signal for controlling the inverter 50 using a switching circuit 3 only for a period when a switching noise signal is generated from the switching circuit 3 repeating ON/OFF operation. Then a comparator circuit 5 compares the unmasked information signal by the mask circuit 6 with a stored reference value in advance. For example, it is diagnosed that a temperature is faulty, a gate control signal such as a switching stop command or a switching reduction command is outputted to a gate circuit 2 to diagnose properly and quickly the presence of a fault. The information signal is detected except a minimum noise production period in this way so as to avoid instantaneous destruction of the switching element.

22. 发明专利

JPH07143615A COOLER OF POWER CONVERTING MEANS FOR ELECTRIC MOTOR VEHICLE 失效
公开(公告)号：JPH07143615A
公开(公告)日：1995-06-02
申请号：JP28359393
申请日：1993-11-12
申请人： HITACHI LTD
发明人： YAMAMURA HIROHISA , MATSUDAIRA NOBUNORI , TAKESO MASANORI
IPC分类号： H05K7/20 , B60L15/00
摘要： PURPOSE:To realize a cooler which maintains the temperature change amount of power converting means at a predetermined value or less and can improve the life of the means. CONSTITUTION:The temperature detection signal of a thermistor 7 and the current signal from a current sensor 17 are fetched to a temperature calculator 92, which calculates a junction temperature Tj. Then, a temperature change amount calculator 94 calculates the change amount ALPHATj of the junction temperature. An ON/OFF judging 95 turns ON a pump 3 to circulate cooling liquid when the amount ALPHATj is larger than a temperature change amount ALPHAT2. It maintains the ON state if the pump 3 is ON at present if the amount ALPHATj falls within a temperature change range ALPHAT2-ALPHAT1, or maintains an OFF state if the pump 3 is OFF at present. If the amount ALPHATj is smaller than the amount ALPHAT1, it turns OFF the pump 3.

23. 发明专利

JPH058832B2 失效
公开(公告)号：JPH058832B2
公开(公告)日：1993-02-03
申请号：JP13720384
申请日：1984-07-04
申请人： HITACHI LTD
发明人： TOKUYAMA KEIICHI , SUDA SEIJI , IGARASHI OSAMU , YAMAMURA HIROHISA , KATOGI KOZO
IPC分类号： G02F1/1335 , G02F1/133 , G09F9/30 , G09F9/35 , G09G3/18

24. 发明专利

JPH0441762B2 失效
公开(公告)号：JPH0441762B2
公开(公告)日：1992-07-09
申请号：JP17837684
申请日：1984-08-29
申请人： HITACHI LTD
发明人： KATOGI KOZO , IGARASHI OSAMU , TOKUYAMA KEIICHI , YAMAMURA HIROHISA , SUDA SEIJI
IPC分类号： G09G3/18 , G01D7/00 , G02F1/133 , G02F1/1335 , G09F9/00 , G09G3/34

25. 发明专利

JPS6483156A DETECTING CIRCUIT OF CURRENT 失效
公开(公告)号：JPS6483156A
公开(公告)日：1989-03-28
申请号：JP23897587
申请日：1987-09-25
申请人： HITACHI LTD
发明人： NOTO YASUO , YAMAMURA HIROHISA
IPC分类号： G01R19/00 , G01R19/32 , G05F1/10 , H02M3/155
摘要： PURPOSE:To conduct the detection of a current by an ON resistance of FET with high accuracy invariably irrespective of a change in temperature, by supplying a source current to FET for current detection thermally-coupled to another FET for switching and by controlling this current. CONSTITUTION:In a motor-operated power steering system for automobiles, a load 2 made up of a DC motor is chopper-controlled by a main FET 3 which is ON-FF controlled by a gate signal supplied from a control unit, and a current I1 flowing through the load 2 on the occasion is detected from a source current I2 of a sub-FET 4 thermally-coupled to the main FET 3. The sub-FET 4 is ON-OFF controlled at the same timing as the main FET 3 by the gate signal supplied to the main FET 3 and it operates to make the source current I2 flow. A differential amplifier 5 receives the respective source voltages V1 and V2 of the main FET 3 and the sub-FET 4 as inputs, generates an output voltage V0 corresponding to a voltage difference between the voltages V1 and V2 and supplies the source current I2 of a prescribed value to the sub-FET 4. A resistor 6 generates a voltage drop due to this source current I2 as a current detection voltage V1.

26. 发明专利

JPS63235167A MOTOR POWER STEERING DEVICE 失效
公开(公告)号：JPS63235167A
公开(公告)日：1988-09-30
申请号：JP6906987
申请日：1987-03-25
申请人： HITACHI LTD
发明人： SUGIMOTO SHUNICHIRO , KIMURA KATSUHISA , NEMOTO KIYOSHI , YAMAMURA HIROHISA , NAKANO SHUICHI
IPC分类号： B62D5/04
摘要： PURPOSE:To allow missing of auxiliary steering power accompanied with detection of abnormality only when running speed has dropped sufficiently by providing prohibiting conditions in separation of auxiliary motor steering power. CONSTITUTION:Upon occurrence of fault, an alarm lamp 20 lights to indicate the fault. Consequently, the vehicle speed is lowered, and when it has dropped below 10Km/h, a clutch 12 is disengaged and an auxiliary steering power transmission system is separated. If there is a possibility of runaway of motor 7 which causes uncontrollable steering, the clutch 12 is disengaged immediately and steering function is ensured sufficiently through manual operation.

27. 发明专利

JPS6311843B2 失效
公开(公告)号：JPS6311843B2
公开(公告)日：1988-03-16
申请号：JP17204180
申请日：1980-12-08
申请人： HITACHI LTD
发明人： YAMAMURA HIROHISA , NAITO SHOTARO , OOMAE TSUTOMU
IPC分类号： B60L15/28 , H02P7/29

28. 发明专利

JPS62278350A CONTROL CIRCUIT FOR AUTOMATIC SPEED CHANGE 失效
公开(公告)号：JPS62278350A
公开(公告)日：1987-12-03
申请号：JP11924986
申请日：1986-05-26
申请人： HITACHI LTD
发明人： YAMAMURA HIROHISA
IPC分类号： F16H59/26 , F16H59/44 , F16H59/74 , F16H61/02
摘要： PURPOSE:To improve fuel consumption and silence during the operation of an engine by providing a load detecting means to detect an engine load except a running load to change conditions for shift up and shift down according to the said detected engine load. CONSTITUTION:In the engine 1 whose output is transmitted to a propeller shaft 10 through a torque converter 2, a gear box 3, and an overdrive gear box 4, the gear box 3 is controlled through a control part 11 according to a car speed condition d and a load condition e. In addition to that, the overdrive gear box 4 is controlled by a microcomputer 6 through a driving part 5 according to a negative pressure a in a suction pipe and a car speed pulse b. In this case, a load signal c such as a compressor on-off signal for an air conditioner is also inputted in the said computer 6, which changes conditions for shift up and shift down to make shift control according to the input state of the load signal c.

29. 发明专利

JPS60263754A AUTOMATIC SPEED CHANGE CONTROL CIRCUIT 失效
公开(公告)号：JPS60263754A
公开(公告)日：1985-12-27
申请号：JP11997584
申请日：1984-06-13
申请人： HITACHI LTD
发明人： YAMAMURA HIROHISA , TSUMAGARI MAMORU
IPC分类号： F16H59/26 , F16H59/44 , F16H59/46 , F16H59/70 , F16H61/02
摘要： PURPOSE:To perform the speed change at the best fuel consumption point by comparing the present engine negative pressure and speed change position with the memory content storing the negative pressure and car speed conditions at the shift-up and shift-down. CONSTITUTION:An engine 1 transmits the power to a planetary gear speed change mechanism 3 through a torque converter 2 and further transmits it to a car through an overdrive speed change mechanism 4. This speed change mechanism 4 determines the negative-pressure conditions in response to the car speed via a map, individual negative-pressure conditions are compared by comparators 12, 13, and an overdrive solenoid 16 is driven. That is, a shift-up map reference circuit 10 A/D-converts the car speed signal detected by a car speed sensor 9, the address of a memory 20 is specified by an address decoder 19, and the negative-pressure conditions in response to the car speed are extracted on a data register 21 in digital values and are D/A-converted. It is quite the same for a shift- down map reference circuit 11.

30. 发明专利

JPS59226601A CONTROLLER FOR ELECTRIC VEHICLE 失效
公开(公告)号：JPS59226601A
公开(公告)日：1984-12-19
申请号：JP9698683
申请日：1983-06-02
申请人： HITACHI LTD
发明人： MARUMOTO KATSUJI , OOMAE TSUTOMU , YAMAMURA HIROHISA
IPC分类号： B60L15/28 , B60L15/08 , H02P7/298 , H02P7/28
摘要： PURPOSE:To stabilize a control system by limiting the torque instruction value in the fully open state of an armature chopper so as not to increase larger than the actual torque, thereby preventing the field current command value from increasing when the armature chopper is fully opened. CONSTITUTION:An accelerator opening signal holding circuit 14 judges whether the conduction rate dm is maximum or not when receiving an accelerator opening ACC1 signal and outputs an accelerator opening ACC2 signal value. A torque command generator 15 inputs the ACC2 signal and a motor rotating speed Nm and outputs a torque command tauc. An armature current command pattern generator 3 and a field current command pattern generator 16 respectively output an armature current command Imc and a field current command Ifc in response to the command tauc. An armature current controller 4 and a field current controller 8 respectively output an armature chopper conduction rate dm and a field chopper conduction rate df in response to the current deviation.

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