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1. 发明专利

DE112007000597T5 未知
公开(公告)号：DE112007000597T5
公开(公告)日：2009-03-12
申请号：DE112007000597
申请日：2007-05-07
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA YASUO , WATANABE YUTAKA , NAKAJIMA KICHIO , YASUDA TOMOHIKO , YAGYU TAKASHI
IPC分类号： B60W10/06 , B60K6/46 , B60L50/13 , B60W10/08 , B60W10/30 , B60W20/00 , F02D29/00 , F02D29/04 , F02D29/06
摘要： Engine driving characteristics are achieved for driving a hydraulic system during non-traveling and traveling in an electrically driven dump truck. When a shift lever 16 is located at a neutral position, the target revolution speed Nr1 corresponding to the operation amount (p) of an accelerator pedal 1 is calculated on the basis of first target revolution speed characteristics (Nr1(p)) which are suitable for driving of a hydraulic pump for working so that an electronic governor 4a is controlled on the basis of this target revolution speed. When the shift lever 16 is located at a forward position, the target revolution speed Nr2 corresponding to the operation amount of the accelerator pedal 1 is calculated on the basis of second target revolution speed characteristics (Nr2(p)) which are suitable for driving of electric motors 12R, 12L so that the electronic governor 4a is controlled on the basis of this target revolution speed.

2. 发明专利

DE112007000061T5 未知
公开(公告)号：DE112007000061T5
公开(公告)日：2008-09-04
申请号：DE112007000061
申请日：2007-05-07
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA YASUO , YASUDA TOMOHIKO , YAGYU TAKASHI , WATANABE YUTAKA
IPC分类号： B60W10/06 , B60K6/46 , B60L50/13 , B60W10/08 , B60W10/30 , B60W20/00 , F02D29/00 , F02D29/06
摘要： A drive system for an electrically driven dump truck is capable of enabling electric motors for traveling to make full use of the output horsepower of the prime mover up to an output limit of the prime mover. A target motor horsepower corresponding to an operation amount of an accelerator pedal is calculated and an available maximum horsepower for the electric motors out of the maximum output horsepower of the prime mover is calculated in response to the actual revolution speed of the prime mover. The horsepower coefficient corresponding to the instantaneous revolution speed deviation is calculated. The available maximum horsepower for the electric motors is modified by the horsepower coefficient to determine a second target motor horsepower. The target motor horsepower is limited to not exceed the second target motor horsepower so as to control the torque of the electric motors.

3. 发明专利

DE19780822T1 未知
公开(公告)号：DE19780822T1
公开(公告)日：1999-03-25
申请号：DE19780822
申请日：1997-08-07
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA YASUO , OCHIAI MASAMI , YAGYU TAKASHI , HASHIMOTO AKIRA , FURUNO YOSHINORI , WATANABE YUTAKA , SUGIYAMA YUKIHIKO
IPC分类号： E02F9/22 , E02F9/26 , F04B49/06 , F04B51/00 , F15B20/00
摘要： PCT No. PCT/JP97/02771 Sec. 371 Date Sep. 3, 1998 Sec. 102(e) Date Sep. 3, 1998 PCT Filed Aug. 7, 1997 PCT Pub. No. WO98/06946 PCT Pub. Date Feb. 19, 1998This invention relates to a fault diagnosis system for hydraulic pumps in a work vehicle, which is economical and permits sure identification of one or more trouble-developed ones of the hydraulic pumps. Pressure sensors 61-64 are arranged on pressurized fluid lines 30,40, which extend to a tank T from points immediately out of center bypasses of flow control valves 21,231-234,451-454,26 communicated to hydraulic pumps 1-6. Solenoid-operated directional control valves 51-56 are interposed in input circuits of individual regulators 11-16 so that, upon excitation, a pressure of a pilot pump 7 is introduced into the regulators 11-16. When all the flow control valves are brought into neutral positions thereof and a determination is instructed through a switch 80, one of the solenoid-operated directional control valves is excited by a signal from a processor 70 so that pressurized fluid is delivered at a maximum flow rate from the corresponding hydraulic pump. A detection value of the corresponding pressure sensor at this time is translated into a flow rate, which is then stored. These procedures are performed with respect to the individual hydraulic pumps successively. Based on a flow rate obtained in every determination, a fault diagnosis of the corresponding particular hydraulic pump is performed.

4. 发明专利

AU3869697A Measurement and display of load of excavating blasted ground 未知
公开(公告)号：AU3869697A
公开(公告)日：1998-03-19
申请号：AU3869697
申请日：1997-08-26
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA YASUO , WATANABE YUTAKA , FURUNO YOSHINORI , YAGYU TAKASHI , SUGIYAMA YUKIHIKO
IPC分类号： E02F3/42 , E02F3/43 , E02F9/20 , E02F9/26 , E21C41/26

5. 发明专利

AU3605197A System for estimating residual service time of work vehicle 未知
公开(公告)号：AU3605197A
公开(公告)日：1998-03-05
申请号：AU3605197
申请日：1997-08-27
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA YASUO , FURUNO YOSHINORI , WATANABE YUTAKA , YAGYU TAKASHI , SUGIYAMA YUKIHIKO
IPC分类号： F02D29/00 , B60K15/077 , E02F9/26 , F02D29/02 , F02D29/04 , G07C5/10 , G06F17/60 , F02B77/08

6. 发明专利

DE69112375T2 未知
公开(公告)号：DE69112375T2
公开(公告)日：1996-03-07
申请号：DE69112375
申请日：1991-09-27
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： WATANABE HIROSHI , TANAKA YASUO , IZUMI EIKI , ONOUE HIROSHI , NAKAMURA SHIGETAKA
IPC分类号： E02F9/22 , F04B49/06 , F15B11/00 , F15B11/05 , F15B11/08 , F15B11/16 , F15B21/08 , F04B49/00
摘要： A control system of a hydraulic pump (1) in a load sensing control hydraulic drive circuit, comprising: a first means (202) in which a target pressure difference between the discharge pressure of the hydraulic pump and the load pressure of an actuator (2) is set a variable value; second means (203, 210-213) for determining a controlling coefficient which increases with an increase in deviation of this target pressure difference as a variable value from an actual pressure difference, decreases with a decrease thereof and increases for a relatively small deviation of the pressure difference when the target pressure difference is small; and third means (205, 206) for determining the target displacement volume from the deviation of the pressure difference and the controlling coefficient; whereby, irrespective of a value of the target pressure difference, stabilized control of the hydraulic pump can be performed, without causing hunting when the operating speed of a control lever (3a) is low, and, when the operating speed of the control lever is high, the control of the hydraulic pump with prompt and quick responses can be performed.

7. 发明专利

DE68903281T2 未知
公开(公告)号：DE68903281T2
公开(公告)日：1993-05-19
申请号：DE68903281
申请日：1989-01-27
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： IZUMI EIKI , TANAKA YASUO , WATANABE HIROSHI , YOSHIDA KUNIAKI , HIRATA TOICHI
IPC分类号： F15B11/00 , E02F9/20 , E02F9/22 , F02D29/04 , F15B11/05 , F15B11/16 , F15B21/08
摘要： A control system for a load-sensing hydraulic drive circuit comprising; at least one hydraulic pump (1); a plurality of hydraulic actuators (2,3) driven with hydraulic fluid delivered from the hydraulic pump; and a pressure compensated flow control valve (4,5,6,7) connected between the pump and each of the actuators, for controlling a flow rate of the fluid supplied to each the actuator in response to an operation signal from control means. The control system comprises first detection means (43) for detecting a differential pressure ( DELTA P) between the delivery pressure of the pump and the maximum load pressure among the plurality of hydraulic actuators; second detection means (14) for detecting the delivery pressure of the pump; first means for calculating, based on a differential pressure signal from the first detection means, a differential pressure target delivery amount Q DELTA p of the pump to hold the differential pressure constant; second means for calculating an input limiting target delivery amount QT of the pump based on at least a pressure signal from the second detection means and an input limiting function preset for the pump; third means for selecting one of the differential pressure target delivery amount Q DELTA p and the input limiting target delivery amount QT as a delivery amount target value Qo for the pump, and then controlling the delivery amount of the pump such that it does not exceed above the input limiting target delivery amount QT; and fourth means for calculating a compensation value Qns to limit a total consumable flow rate for the actuator based on at least the input limiting target delivery amount QT and the differential pressure target delivery amount Q DELTA p when the input limiting target delivery amount QT is selected by the third means, and then controlling the pressure compensated flow control valve based on the compensation value Qns.

8. 发明专利

DE112007001345T5 未知
公开(公告)号：DE112007001345T5
公开(公告)日：2009-05-28
申请号：DE112007001345
申请日：2007-05-18
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA YASUO , YASUDA TOMOHIKO , YAGYU TAKASHI , WATANABE YUTAKA
IPC分类号： B60W10/08 , B60K6/46 , B60L50/13 , B60W10/06 , B60W10/30 , B60W20/00

9. 发明专利

AU2006288487A1 Hydraulic drive device for dump truck 未知
公开(公告)号：AU2006288487A1
公开(公告)日：2007-03-15
申请号：AU2006288487
申请日：2006-08-22
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： FUSHIKI MICHIO , YASUDA TOMOHIKO , YAGYU TAKASHI , KANEKO SATORU , TANAKA YASUO
IPC分类号： F02D29/06 , B60K6/46 , B60P1/16 , B60W10/30 , B60W20/00 , F15B11/00
摘要： A hydraulic drive system is provided with a generator 8 for outputting electricity corresponding to a rotation speed of an engine 7, an electric motor 11 drivable responsive to the electricity from the generator 8, hydraulic pumps 12a, 12b drivable by the electric motor 11, truck-body elevating cylinders 6 for pivoting a truck body 5 in an up-and-down direction, and a stroke detector 14 for detecting a stroke of the control apparatus of the truck-body elevating cylinders 6, and is also provided with a controller 19 for performing control of engine rotation speed. The controller 19 includes a motor electric-power computing means 19a for determining electric power for the electric motor 11, which corresponds to the stroke detected by the stroke detector 14, and a discrimination means 19b for discriminating whether or not the electricity from the generator 8 has become greater than the thus-determined electric power for the electric motor 1.

10. 发明专利

AU723725B2 System for estimating residual service time of work vehicle 未知
公开(公告)号：AU723725B2
公开(公告)日：2000-09-07
申请号：AU3605197
申请日：1997-08-27
申请人： HITACHI CONSTRUCTION MACHINERY
发明人： TANAKA YASUO , FURUNO YOSHINORI , WATANABE YUTAKA , YAGYU TAKASHI , SUGIYAMA YUKIHIKO
IPC分类号： F02D29/00 , B60K15/077 , E02F9/26 , F02D29/02 , F02D29/04 , G07C5/10 , G06F17/60 , F02B77/08

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