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1. 发明专利

JPH05176402A STATE INDICATOR FOR ELECTRIC VEHICLE 失效
公开(公告)号：JPH05176402A
公开(公告)日：1993-07-13
申请号：JP30305791
申请日：1991-11-19
申请人： HITACHI AUTOMOTIVE ENG , HITACHI LTD
发明人： YAMADA HIROYUKI , YOSHIHARA SHIGEYUKI , YAMAMURA HIROHISA
IPC分类号： B60L3/00
摘要： PURPOSE:To provide an operator with information by vidually displaying the traveling state of electric vehicle or the operating state of controller for the operator. CONSTITUTION:A microcomputor 5 receives signals from an accelerator 3 and a rotation detector 12 to operate an operation mode, a speed, and the like and create data for a display driving circuit 2 which drives a state display 1 to display the operating state, the speed, and the like of a vehicle. Since the state of vehicle, controller or driver is displayed for the operator of electric vehicle, highly efficient safety operation can be realized. Furthermore, since the state of driver can be known, overload operation can be prevented.

2. 发明专利

JPS6474164A MOTOR-DRIVEN POWER STEERING DEVICE 失效
公开(公告)号：JPS6474164A
公开(公告)日：1989-03-20
申请号：JP22990487
申请日：1987-09-16
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ISHIKURA HISATSUGU , TAWARA KAZUO , ABUKAWA TOSHIMI , MARUMOTO KATSUJI , KODERASAWA TOSHIYUKI , MOTOBE MITSUSACHI , TAKAHASHI TADASHI , YAMAMURA HIROHISA , TATSUZAKI TORU , OMAE TSUTOMU , TAKAMATSU SHUICHI
IPC分类号： B62D6/02 , B62D5/04
摘要： PURPOSE:To enable the optimum assist force to be continually generated in proper quantities by detecting vehicle weight acting on a steered wheel and controlling the assist force of steering being based on the detecting result. CONSTITUTION:When a handle is controlled, detecting control force, applied to the handle 1, by a torque sensor 8, an output current I in accordance with detected steering torque tau is supplied to an assist generating electric motor 5 from a control unit 10. And giving power of this electric motor 5 to a rack 3 through a reduction gear 6 and a pinion 7, steering control action is assisted. Here providing a load sensor 9 in a suspension part of a steered wheel (front wheel) 4, detecting car weight acting on the front wheel 4 by the load sensor 9 and selecting one of the two or more function characteristics, showing the relation between the steering torque tau and the output current I, in accordance with the car weight, the output current I is determined in accordance with this function characteristic, generating the predetermined assist force.

3. 发明专利

JPS6444377A MOTOR-OPERATED POWER STEERING CONTROL SYSTEM 失效
公开(公告)号：JPS6444377A
公开(公告)日：1989-02-16
申请号：JP19974887
申请日：1987-08-12
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ABUKAWA TOSHIMI , TAWARA KAZUO , MARUMOTO KATSUJI , KODERAZAWA TOSHIYUKI , MOTOBE MITSUSACHI , TAKAHASHI TADASHI , TAKAMATSU SHUICHI , ISHIKURA HISATSUGU , YAMAMURA HIROHISA , TATSUZAKI TORU , OMAE TSUTOMU , OKUYAMA TOSHIAKI
IPC分类号： B62D5/04
摘要： PURPOSE:To achieve the attainment of low current, and the miniaturization of a device by applying a higher voltage than an on-vehicle battery voltage to the input terminal of a motor-operated power steering control unit, and further by making it possible to charge the battery via a control circuit having step-up and step-down functions. CONSTITUTION:In the captioned device, the power of an electric motor 7 is transmitted to a pinion 9 engaging with the rack 5 of a steering mechanism via a speed reducer 8 so as to assist the steering force. The motor 7 is electrification-controlled by a control unit 11 on the basis of the output of a torque sensor 3. In this case, the output voltage of a charging generator 15 being driven by an engine 14 is set higher than the voltage of a battery 13. And during the rotation of the engine, the output power of the charging generator 15 is supplied to the motor 7 via a full wave rectifier 16, and further the voltage stepped down via a step-up/step-down chopper circuit 12 is supplied to the battery 13 respectively. On the other hand, when the engine is stopped, the electric power stepped up via the step-up/step-down chopper circuit 12 is supplied to the electric motor 7.

4. 发明专利

JPS60113106A ELECTRONIC ODOMETER 失效
公开(公告)号：JPS60113106A
公开(公告)日：1985-06-19
申请号：JP22065583
申请日：1983-11-25
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： YOSHIHARA SHIGEYUKI , YAMAMURA HIROHISA
IPC分类号： G01C22/00 , G01C22/02
摘要： PURPOSE:To prevent degradation of reliability due to abnormality of power supply or the like by writing an integrated covered distance, which is operated on a basis of covered distance information, in a non-volatile memory within a prescribed rewrite voltage impression time and displaying it simultaneously and reading it from the memory. CONSTITUTION:The number of pulses from a pulse generating part 1 of a wheel of a vehicle is counted by a counter part 2, and a running signal 2a is generated at intervals of a prescribed covered distance, and the integrated covered distance is operated in a microcomputer 3 and is displayed on a display part 6. Meanwhile, a data rewrite voltage 8a is impressed from a rewrite voltage generating part 8 to a non-volatile memory 7 by a control signal 9a which is generated from a timer part 9, which detects the signal 2a, for a certain time, and integrated covered distance data is written from the computer 3 to the memory 7 during this application time, and data in the memory 7 is read out by the computer and is written in an RAM5 when a power source is turned on again, and thus, disappearance of data for abnormality of power supply is prevented.

5. 发明专利

JPH05176418A CONTROLLER FOR ELECTRIC AUTOMOBILE 失效
公开(公告)号：JPH05176418A
公开(公告)日：1993-07-13
申请号：JP5995791
申请日：1991-03-25
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： MASAKI RYOZO , TAKAMOTO YUSUKE , OBARA SANSHIRO , YAMAMURA HIROHISA , YAMADA HIROYUKI
IPC分类号： B60L9/18 , B60L11/18 , B60L15/20 , H02P5/00 , H02P5/74
摘要： PURPOSE:To realize stabilized traveling in the intended direction of driver, regardless of different pavement resistance, coefficient or pneumatic pressure between right and left tires, by controlling torque and speed. CONSTITUTION:In an electric automobile 1 wherein motors 3a, 3b for independently driving left and right tires 2a, 2b are subjected to speed control through speed control operating sections 14a, 14b in a controller 6, motor speed commands are produced from a vehicle control operating section 15 which receives signals from an accelerator 7, a brake 8, a steering wheel 10, and the like. In such system, output torque signals from torque detectors 13a, 13b are fed to a speed difference command operating section 16. Speed difference between the left and right drive motors 3a, 3b is then operated based on the difference between the output torque signals and a speed difference command is delivered to the vehicle control operating section 15. Consequently, control is made such that the differential torque has a predetermined value. According to the constitution, differential torque can be controlled to zero in similar manner as a differential unit while furthermore it can be varied depending on the pavement conditions.

6. 发明专利

JPH01115770A POWER STEERING DEVICE 失效
公开(公告)号：JPH01115770A
公开(公告)日：1989-05-09
申请号：JP27301787
申请日：1987-10-30
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TAWARA KAZUO , ABUKAWA TOSHIMI , MARUMOTO KATSUJI , KODERAZAWA TOSHIYUKI , MOTOBE MITSUSACHI , TAKAHASHI TADASHI , TAKAMATSU SHUICHI , ISHIKURA HISATSUGU , YAMAMURA HIROHISA , TATSUZAKI TORU , OMAE TSUTOMU
IPC分类号： B62D6/02 , B62D5/04
摘要： PURPOSE:To cope with rapid steering during high speed running and to improve a steering feeling, by a method wherein, during running at a high speed higher than some car speed, a battery voltage is boosted by a boosting circuit to apply the voltage on a control device and an electric motor. CONSTITUTION:A voltage signal Vo responding to an output signal Vs from a car speed sensor is generated from a voltage command circuit 126, and the signal Vo is compared with an interterminal voltage Vc of a capacitor 125 for smoothing by means of a voltage controller 127. A control signal is outputted to a drive circuit 128 of a transistor chopper 122 in a boosting circuit 12 to perform a chopper motion. The voltage command circuit 126 is set so that at a car speed higher than some car speed, for example, approximate 45km/h, a voltage command value is increased with the increase in a car speed. Further, transistor chopper circuits 118 and 119 are controlled by means of a current controller 117 so that a motor current I is coincided with a motor current command value Io from a current command circuit 116.

7. 发明专利

JPH01103572A ELECTRIC POWER STEERING DEVICE 失效
公开(公告)号：JPH01103572A
公开(公告)日：1989-04-20
申请号：JP26168287
申请日：1987-10-19
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ABUKAWA TOSHIMI , OKUYAMA TOSHIAKI , TAWARA KAZUO , MARUMOTO KATSUJI , KODERAZAWA TOSHIYUKI , MOTOBE MITSUSACHI , TAKAHASHI TADASHI , ISHIKURA HISATSUGU , YAMAMURA HIROHISA , TATSUZAKI TORU , OMAE TSUTOMU , TAKAMATSU SHUICHI
IPC分类号： B62D5/04
摘要： PURPOSE:To aim at reduction in any effect of load to other electrical equipment by installing two types of voltage takeoff ports in an engine-driven generator, feeding power to a PS voltage motor from a generator takeoff port during engine driving, and performing the feed from a car-mounted battery at engine stoppage. CONSTITUTION:A steering angle or the like of a handwheel shaft 2 is detected by a torque detector 10 and inputted into a PS control circuit 11, thereby operating a chopper controller 20, and a PS operating electric motor 7 is driven. A generator 17 being free of being driven by an engine 13 is installed there, and two types of voltage takeoff ports A, B are installed in the generator 17. At the time of engine driving, the PS electric motor 7 is fed out of the takeoff port B, and the takeoff port A is used for charging of a battery 18 for car-mounted equipment use. At the time of nondriving of the engine, all feed inclusive of the PS electric motor 7 is carried out by the battery 18. Unloading of a car-mounted battery is promoted, whereby any effect due to load to other electrical equipment is thus reducible.

8. 发明专利

JPH0194064A ELECTRIC POWER STEERING 失效
公开(公告)号：JPH0194064A
公开(公告)日：1989-04-12
申请号：JP24981687
申请日：1987-10-05
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TAWARA KAZUO , ABUKAWA TOSHIMI , MARUMOTO KATSUJI , KODERAZAWA TOSHIYUKI , MOTOBE MITSUSACHI , TAKAHASHI TADASHI , TAKAMATSU SHUICHI , ISHIKURA HISATSUGU , YAMAMURA HIROHISA , TATSUZAKI TORU , OMAE TSUTOMU
IPC分类号： B62D5/04 , B62D6/02
摘要： PURPOSE:To make ample driving torque securable as auxiliary steering force at the time of rest swing by boosting battery voltage with a booster circuit at the time of the rest swing, and making it so as to be impressed on a controller and an electric motor. CONSTITUTION:An electric motor 7 available for a power steering generates high output even if its rotational frequency is low when a motor current is larger enough, and it has such a characteristic that is low in the generating torque even if its rotational frequency is high when the motor current is small. At the time of rest swing, its load torque grows large, whereby a large current flows in the motor 7, and since a voltage drop in a battery 13 becomes large, a booster circuit 12, boosting the extent of battery voltage, is installed in a drive circuit. The booster circuit 12 is designed so as to be controlled by a controller 11, and car speed Vs, torque tau and a steering angle theta are inputted into the controller 11, and on the basis of these input signals, an impressed current is controlled.

9. 发明专利

JPH01122780A STEERING ANGLE DISPLAY DEVICE FOR STEERING WHEEL OF VEHICLE 失效
公开(公告)号：JPH01122780A
公开(公告)日：1989-05-16
申请号：JP27932987
申请日：1987-11-06
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KODERASAWA TOSHIYUKI , MARUMOTO KATSUJI , MOTOBE MITSUSACHI , TAWARA KAZUO , ABUKAWA TOSHIMI , TAKAHASHI TADASHI , TAKAMATSU SHUICHI , ISHIKURA HISATSUGU , YAMAMURA HIROHISA , TATSUZAKI TORU , OMAE TSUTOMU
IPC分类号： B62D15/02
摘要： PURPOSE:To eliminate the unexpected movement of a vehicle so as to perform operations safely by providing an angle detector detecting the concentric angle of wheels, and letting a communicator inform the concentric angle detected thereby. CONSTITUTION:The rotating actuation of a steering wheel 1 lets a pinion gear 3 on a steering shaft 2 be rotated so as to allow a rack 4 to be moved to the axial direction for wheels 6a and 6b by way of tire rods 5a and 5b. In a steering device as set forth herein above, an angle detector 7 including a linear position sensor 22 detecting the distance of movement of the rack 4 is provided so as to let the directional angle signal of the wheel be generated. The directional angle signal is inputted into a display driver 12 via an amplifier 8 so as to let display image signals be synthesized for allowing the display image signals to display a vehicle image including the wheels directed to a directional angle set by the rotational actuation of the steering wheel 1 on a liquid crystal display 13 (communicator).

10. 发明专利

JPH04150702A CONTROLLER FOR ELECTRIC MOTOR VEHICLE 失效
公开(公告)号：JPH04150702A
公开(公告)日：1992-05-25
申请号：JP27226890
申请日：1990-10-12
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HORIKOSHI SHIGERU , YAMADA HIROYUKI , YAMAMURA HIROHISA , MASAKI RYOZO
IPC分类号： B60L9/18
摘要： PURPOSE:To realize highly efficient traction by determining the slip of each driving wheel based on an output from a vehicle speed detector and a number of revolution of a wheel to be driven through a plurality of motors and then controlling the torque and the rotational speed of motor according to thus determined slip. CONSTITUTION:A battery 7 drives a pair of driving motors 6 (only a left side motor is shown) thus rotating a driving wheel 5 through a gear 11. A vehicle speed Vs detected through a vehicle speed detector 2 and rotational speeds V1, V2 of the motor 6 detected through a rotational speed detector 3 are fed to a controller 4. Furthermore, steering amount of a steering wheel 13 detected through a steering force detector 9 in a steering unit 10 and a stepping amount of an accelerator 8 are fed to the controller 4. When the rotational speeds of the motor 6 is excessive as compared with the vehicle speed Vs, the controller makes a decision of slip or idling and lowers the current of motor thus lowering the rotational speed thereof. According to the constitution, a highly efficient traction is realized even upon abrupt change of pavement or at a curved part.

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