US20170175745A1 - Electric pump system - Google Patents

Electric pump system Download PDF

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Publication number
US20170175745A1
US20170175745A1 US15/382,088 US201615382088A US2017175745A1 US 20170175745 A1 US20170175745 A1 US 20170175745A1 US 201615382088 A US201615382088 A US 201615382088A US 2017175745 A1 US2017175745 A1 US 2017175745A1
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United States
Prior art keywords
pump
motor
rotational speed
circuit
time period
Prior art date
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Abandoned
Application number
US15/382,088
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English (en)
Inventor
Hiroki Kagawa
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JTEKT Corp
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JTEKT Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Assigned to JTEKT CORPORATION reassignment JTEKT CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAGAWA, HIROKI
Publication of US20170175745A1 publication Critical patent/US20170175745A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2203/00—Motor parameters
    • F04B2203/02—Motor parameters of rotating electric motors
    • F04B2203/0209—Rotational speed

Definitions

  • the present invention relates to systems that drive a pump, and more particularly to systems that drive an oil pump for use in automatic transmissions.
  • JP 2000-27992 A discloses a system that drives a pump for use in automatic transmissions of vehicles.
  • JP 2002-310102 discloses a system that drives a pump for use in hydraulic shovels.
  • the system described in JP 2000-27992 A includes a first pump, a second pump, and a motor that simultaneously drives these pumps.
  • the pressure of oil discharged from the first pump is regulated by a line pressure control valve.
  • the discharged oil whose pressure has been regulated is supplied to a hydraulic drive unit of a primary pulley of a continuously variable transmission (CVT) through a shift control valve, or is supplied to a hydraulic drive unit of a secondary pulley of the CVT without flowing through the shift control valve.
  • Oil discharged from the second pump is supplied to the pulleys, a belt, etc. of the CVT through an oil cooler.
  • the flow rate of each hydraulic line varies depending on the driving conditions of a vehicle.
  • the flow rate required for the first pump and the flow rate required for the second pump are calculated based on the speed ratio, the line pressure, the oil temperature, etc. at that time.
  • the flow rate required for the first pump and the flow rate required for the second pump are compared with each other.
  • the number of revolutions of the pumps is determined so that oil can be supplied at the larger flow rate.
  • the system described in JP 2002-310102 A includes a first cylinder, a first hydraulic circuit that drives the first cylinder, a first pump that supplies an oil pressure to the first hydraulic circuit, a second cylinder, a second hydraulic circuit that drives the second cylinder, a second pump that supplies an oil pressure to the second hydraulic circuit, and an electric motor that drives the first and second pumps. If one of operation bodies is operated, the number of revolutions of the electric motor is set based on an operation signal corresponding to the amount of operation of the operation body. If both of the two operation bodies are operated, the number of revolutions of the electric motor is set based on an operation signal corresponding to the amount of operation of the operation body operated by a larger amount.
  • a pump In systems that hydraulically operate a device, a pump is sometimes required to discharge a required amount of fluid, as described in JP 2000-27992 A. As described in JP 2000-27992 A, the pump can discharge a required amount of fluid if driven at the number of revolutions determined according to the amount of fluid to be discharged. However, it is difficult to drive the pump in an appropriate state if only discharge of the required amount of fluid is considered.
  • An electric pump system includes a pump, a motor, and a control circuit.
  • the motor drives the pump.
  • the control circuit controls operation of the motor.
  • the control circuit includes a determination circuit, a generation circuit, and a drive circuit.
  • the determination circuit determines an amount of fluid to be discharged from the pump.
  • the generation circuit generates, based on a maximum rotational speed of the motor, a control profile that is used to control a rotational speed of the motor.
  • the maximum rotational speed of the motor is set according to an environment in which the pump is used.
  • the control profile is used for the pump to discharge the amount of fluid determined by the determination circuit in a shortest time.
  • the drive circuit drives the motor based on the control profile generated by the generation circuit.
  • An electric pump system can drive a pump in an appropriate state.
  • FIG. 1 is a block diagram showing the general configuration of an electric pump system according to an embodiment of the present invention
  • FIG. 2 is an illustration showing an example of a control profile
  • FIG. 3 is an illustration showing another example of the control profile.
  • FIG. 4 is a block diagram showing the general configuration of an application of the electric pump system.
  • FIG. 1 is a block diagram showing the general configuration of an electric pump system 10 according to an embodiment of the present invention.
  • the electric pump system 10 is used to drive pulleys of a continuously variable transmission (CVT).
  • CVT continuously variable transmission
  • the electric pump system 10 is used to move hydraulic oil between a cylinder that drives a primary pulley and a cylinder that drives a secondary pulley.
  • the electric pump system 10 includes a pump unit 12 and an upper electronic control unit (ECU) 14 .
  • ECU electronice control unit
  • the pump unit 12 is provided separately from the upper ECU 14 .
  • the pump unit 12 is placed away from the upper ECU 14 .
  • the pump unit 12 is connected to the upper ECU 14 via wiring, so that the pump unit 12 can receive signals from the upper ECU 14 .
  • the pump unit 12 can thus operate based on commands from the upper ECU 14 .
  • the pump unit 12 includes a pump 16 , a motor 18 , and a controller 20 .
  • the pump 16 , the motor 18 , and the controller 20 will be described below.
  • the pump 16 sucks hydraulic oil through its suction port and discharges the sucked hydraulic oil through its discharge port.
  • the pump 16 is a positive-displacement rotary pump.
  • the capacity of a chamber that accommodates hydraulic oil increases when the pump sucks hydraulic oil through its suction port, and the capacity of the chamber decreases when the pump discharges hydraulic oil through its discharge port.
  • the positive-displacement rotary pump may be a gear pump or a vane pump.
  • the gear pump may be an internal gear pump or an external gear pump.
  • the motor 18 drives the pump 16 .
  • the motor 18 is a brushless motor.
  • the controller 20 controls operation of the motor 18 .
  • the controller 20 includes a drive circuit 201 , a generation circuit 202 , and a memory 203 .
  • the drive circuit 201 drives the motor 18 .
  • the drive circuit 201 feedback-controls the motor 18 .
  • the drive circuit 201 includes a rotational speed control circuit 2011 and a current control circuit 2012 .
  • the rotational speed control circuit 2011 feedback-controls the rotational speed of the motor 18 so that an actual rotational speed (detected value) of the motor 18 follows a target rotational speed (command value).
  • the current control circuit 2012 feedback-controls the drive current of the motor 18 so that an actual drive current (detected value) of the motor 18 follows a target drive current (command value).
  • the period of feedback control of the drive current is shorter than that of feedback control of the rotational speed. Accordingly, when feedback control of the rotational speed is performed, an actual drive current (detected value) has already been controlled to a target drive current (command value).
  • the generation circuit 202 generates a control profile based on a signal that is sent from the upper ECU 14 (a signal indicating the amount of fluid to be discharged from the pump 16 ).
  • the control profile is used when driving the motor 18 .
  • the control profile will be described in detail later.
  • the generation circuit 202 includes a conversion circuit 202 A and a distribution circuit 202 B.
  • the conversion circuit 202 A and the distribution circuit 202 B will be described later.
  • the conversion circuit 202 A sets the number of revolutions of the motor 18 which is required for the pump 16 to discharge the amount of fluid corresponding to a command from the upper ECU 14 . That is, the conversion circuit 202 A converts the amount of fluid to be discharged from the pump 16 to the total number of revolutions of the motor 18 .
  • the amount of discharge per revolution of the pump 16 is considered when converting the amount of fluid to be discharged from the pump 16 to the number of revolutions of the motor 18 .
  • the amount of discharge per revolution of the pump 16 is obtained in view of the temperature (oil temperature) of hydraulic oil that is discharged from the pump 16 and load characteristics of the pump 16 .
  • the oil temperature is detected when converting the amount of fluid to be discharged from the pump 16 to the number of revolutions of the motor 18 .
  • the oil temperature is detected by, e.g., a temperature sensor.
  • the temperature sensor is placed in a conduit connected to the pump 16 .
  • the load characteristics of the pump 16 are determined by, e.g., the state of hydraulic oil in the conduit connected to the discharge port of the pump 16 .
  • the state of hydraulic oil in the conduit is determined by, e.g., the pressure of hydraulic oil (oil pressure) in the conduit.
  • the oil pressure is detected when converting the amount of fluid to be discharged from the pump 16 to the number of revolutions of the motor 18 .
  • the oil pressure is detected by, e.g., a pressure sensor.
  • the pressure sensor is placed in the conduit connected to the pump 16 .
  • a lookup table 401 is used when setting the amount of discharge per revolution of the pump 16 .
  • the lookup table 401 shows the relationship among the oil temperature, the load characteristics of the pump 16 , and the amount of discharge per revolution of the pump 16 .
  • the lookup table 401 is stored in advance in the memory 203 .
  • a lookup table 402 is used when setting the total number of revolutions of the motor 18 .
  • the lookup table 402 shows the relationship between the amount of fluid to be discharged from the pump 16 (the amount of fluid corresponding to a command from the upper ECU 14 ) and the amount of discharge per revolution of the pump 16 .
  • the lookup table 402 is stored in advance in the memory 203 .
  • the distribution circuit 202 B distributes the number of revolutions of the motor 18 set by the conversion circuit 202 A.
  • the distribution circuit 202 B distributes the number of revolutions of the motor 18 so as to minimize the time required for the pump 16 to discharge the amount of fluid corresponding to a command from the upper ECU 14 .
  • the control profile is generated by distributing the number of revolutions of the motor 18 by the distribution circuit 202 B.
  • the control profile 30 shows the rotational speed of the motor 18 in every predetermined period T1.
  • the control profile 30 includes a time period 301 , a time period 302 , and a time period 303 .
  • the time period 301 starts when the motor 18 starts to be driven based on the control profile 30 . That is, the time period 301 includes the starting point of the control profile 30 .
  • the motor 18 is not driven until the time period 301 starts.
  • the rotational speed of the motor 18 is therefore zero before the time period 301 starts.
  • the number of revolutions of the motor 18 increases in every predetermined period T1. Namely, the rotational speed of the motor 18 (the rotational speed of the motor 18 in each period T1) increases in the time period 301 .
  • the rate (gradient) 3011 of increase in rotational speed of the motor 18 is constant in the time period 301 .
  • the motor 18 is rotating at its maximum rotational speed when the time period 301 ends.
  • the time period 302 starts when the time period 301 ends. Namely, the time period 302 is continuous with the time period 301 .
  • the rotational speed of the motor 18 at the end of the time period 301 is maintained in the time period 302 . That is, the maximum rotational speed of the motor 18 is maintained in the time period 302 .
  • the number of revolutions of the motor 18 therefore does not change in every period T1.
  • the time period 302 is preferably equal to or longer than the time period 301 .
  • the time period 303 starts when the time period 302 ends. Namely, the time period 303 is continuous with the time period 302 . The time period 303 continues until driving of the motor 18 based on the control profile 30 is finished. That is, the time period 303 includes the end point of the control profile 30 .
  • the rotational speed of the motor 18 at the start of the time period 303 is the maximum rotational speed of the motor 18 .
  • the rotational speed of the motor 18 decreases in the time period 303 . Namely, in the time period 303 , the number of revolutions of the motor 18 decreases in every period T1.
  • the rate (gradient) 3031 of decrease in rotational speed of the motor 18 is constant in the time period 303 .
  • the rotational speed of the motor 18 is zero after the time period 303 ends. Namely, the motor 18 is stopped when the time period 303 ends.
  • the time period 303 is preferably shorter than the time period 302 .
  • the distribution circuit 202 B includes a rotational speed setting circuit 2021 , a rate-of-increase setting circuit 2022 , and a rate-of-decrease setting circuit 2023 .
  • the rotational speed setting circuit 2021 , the rate-of-increase setting circuit 2022 , and the rate-of-decrease setting circuit 2023 will be described below.
  • the rotational speed setting circuit 2021 sets the maximum rotational speed of the motor 18 (the rotational speed of the motor 18 in the time period 302 ) according to the environment in which the pump 16 is used. Specifically, the rotational speed setting circuit 2021 sets the maximum rotational speed of the motor 18 in view of, e.g., the temperature (oil temperature) of hydraulic oil that is discharged from the pump 16 and the load characteristics of the pump 16 .
  • a lookup table 403 is used when the rotational speed setting circuit 2021 sets the maximum rotational speed of the motor 18 .
  • the lookup table 403 is stored in advance in the memory 203 . For example, the lookup table 403 shows the relationship among the oil temperature, the load characteristics of the pump 16 , and the maximum rotational speed of the motor 18 .
  • the rate-of-increase setting circuit 2022 sets the rate 3011 in the time period 301 (namely, the rate of increase in rotational speed of the motor 18 in the time period 301 ) according to the environment in which the pump 16 is used.
  • the rate-of-increase setting circuit 2022 sets the rate 3011 in view of, e.g., the temperature (oil temperature) of hydraulic oil that is discharged from the pump 16 and the load characteristics of the pump 16 .
  • a lookup table 404 is used when the rate-of-increase setting circuit 2022 sets the rate 3011 .
  • the lookup table 404 is stored in advance in the memory 203 .
  • the lookup table 404 shows the relationship among the oil temperature, the load characteristics of the pump 16 , and the rate 3011 .
  • the rate-of-decrease setting circuit 2023 sets the rate 3031 in the time period 303 (namely, the rate of decrease in rotational speed of the motor 18 in the time period 303 ) according to the environment in which the pump 16 is used. Specifically, the rate-of-decrease setting circuit 2023 sets the rate 3031 in view of, e.g., the temperature (oil temperature) of hydraulic oil that is discharged from the pump 16 and the load characteristics of the pump 16 .
  • a lookup table 405 is used when the rate-of-decrease setting circuit 2023 sets the rate 3031 .
  • the lookup table 405 is stored in advance in the memory 203 . For example, the lookup table 405 shows the relationship among the oil temperature, the load characteristics of the pump 16 , and the rate 3031 .
  • the upper ECU 14 controls a shift device of a vehicle.
  • the upper ECU 14 includes a determination circuit 141 .
  • the determination circuit 141 determines the amount of fluid to be discharged from the pump 16 .
  • the amount of fluid to be discharged from the pump 16 is the amount of fluid required to drive the pulleys of the CVT.
  • the upper ECU 14 outputs the amount of fluid determined by the determination circuit 141 (the amount of fluid to be discharged from the pump 16 ) to the controller 20 . Namely, a command that is output from the upper ECU 14 to the controller 20 indicates the amount of fluid to be discharged from the pump 16 .
  • the determination circuit 141 determines the amount of fluid to be discharged from the pump 16 .
  • the upper ECU 14 transmits the amount of fluid determined by the determination circuit 141 to the controller 20 .
  • the generation circuit 202 generates the control profile 30 (see FIG. 2 ) based on the amount of fluid corresponding to a command from the upper ECU 14 .
  • the conversion circuit 202 A sets the number of revolutions of the motor 18 (the total number of revolutions of the motor 18 ) which is required for the pump 16 to discharge the amount of fluid corresponding to the command from the upper ECU 14 .
  • the distribution circuit 202 B distributes the total number of revolutions of the motor 18 set by the conversion circuit 202 A so as to minimize the time required for the pump 16 to discharge this amount of fluid.
  • the control profile 30 is thus generated.
  • the drive circuit 201 drives the motor 18 based on the control profile 30 , whereby the pump 16 is driven.
  • the amount of fluid corresponding to the command from the upper ECU 14 is thus discharged from the pump 16 .
  • the electric pump system 10 When generating the control profile 30 , the electric pump system 10 refers to a maximum number of revolutions of the motor 18 so as to minimize the time required for the pump 16 to discharge the amount of fluid corresponding to the command from the upper ECU 14 . Maximum capability of the motor 18 is thus obtained.
  • the control profile 30 has the time period 302 .
  • the maximum rotational speed of the motor 18 is maintained in the time period 302 . Discharge efficiency of the pump 16 is thus improved.
  • the control profile 30 has the time periods 301 , 303 .
  • the time required to increase the rotational speed of the motor 18 to the maximum rotational speed is minimized in the time period 301 .
  • the time required to stop the motor 18 is minimized in the time period 303 .
  • the time period 302 during which the maximum rotational speed of the motor 18 is maintained can be increased. The discharge efficiency of the pump 16 can thus further be improved.
  • the generation circuit 202 is provided in the pump unit 12 . This reduces the processing load on the upper ECU 14 as compared to the case where the upper ECU 14 generates the control profile.
  • the pump 16 is driven based on the control profile.
  • the time required to discharge the amount of fluid corresponding to a command from the upper ECU 14 can thus be known before the pump 16 starts to be operated.
  • the time required to discharge the amount of fluid corresponding to a command from the upper ECU 14 can be designated by appropriately setting the lengths of the time periods 301 , 302 , 303 , as long as it is within the capability of the pump 16 .
  • the electric pump system includes a pump, a motor, and a control circuit.
  • the motor drives the pump.
  • the control circuit controls operation of the motor.
  • the control circuit includes a determination circuit, a generation circuit, and a drive circuit.
  • the determination circuit determines an amount of fluid to be discharged from the pump.
  • the generation circuit generates, based on a maximum rotational speed of the motor, a control profile that is used to control a rotational speed of the motor.
  • the maximum rotational speed of the motor is set according to an environment in which the pump is used.
  • the control profile is used for the pump 16 to discharge the amount of fluid determined by the determination circuit in a shortest time.
  • the drive circuit drives the motor based on the control profile generated by the generation circuit.
  • the generation circuit refers to the maximum rotational speed of the motor when generating the control profile. Accordingly, maximum capability of the motor can be obtained by driving the motor based on the control profile. That is, the electric pump system can drive the pump in an appropriate state.
  • the environment in which the pump is used includes a condition that affects operation of the pump.
  • this condition includes the viscosity (temperature) of fluid that is discharged from the pump, the state of fluid (e.g., the pressure of the fluid) in a conduit connected to a discharge port of the pump.
  • this condition may be directly detected by a sensor or may be estimated from the detection result of the sensor.
  • the control profile preferably includes a first time period, a second time period, and a third time period.
  • the rotational speed of the motor is increased from an initial rotational speed at the time the motor is driven based on the control profile to the maximum rotational speed at a maximum rate of increase that is set according to the environment in which the pump is used.
  • the maximum rotational speed is maintained.
  • the rotational speed of the motor is decreased from the maximum rotational speed to the initial rotational speed at a maximum rate of decrease that is set according to the environment in which the pump is used.
  • the time it takes for the rotational speed of the motor to increase from the initial rotational speed to the maximum rotational speed and the time it takes for the rotational speed of the motor to decrease from the maximum rotational speed to the initial rotational speed can be reduced.
  • the time period (second time period) in which the maximum rotational speed is maintained can therefore be increased. Maximum capability of the motor can thus be obtained.
  • the generation circuit preferably includes a rotational speed setting circuit, a rate-of-increase setting circuit, and a rate-of-decrease setting circuit.
  • the rotational speed setting circuit sets the maximum rotational speed according to the environment in which the pump is used.
  • the rate-of-increase setting circuit sets the maximum rate of increase according to the environment in which the pump is used.
  • the rate-of-decrease setting circuit sets the maximum rate of decrease according to the environment in which the pump is used.
  • the maximum rotational speed, the maximum rate of increase, and the maximum rate of decrease can be set appropriately.
  • a pump unit may include the pump, the motor, the generation circuit, and the drive circuit.
  • the control profile can be generated in the pump unit. This can reduce the processing load on a control device as compared to the case where the control profile is generated by the control device provided separately from the pump unit.
  • a pump unit may include the pump, the motor, and the drive circuit.
  • the determination circuit and the generation circuit are provided separately from the pump unit. This ensures flexibility in arranging the components of the electric pump system. Since the control profile is not generated in the pump unit, the processing load on the pump unit can be reduced.
  • the rate of increase in rotational speed of the motor 18 need not be constant over the entire time period 301 .
  • the rate 3012 of increase in rotational speed of the motor 18 may be gently changed in the beginning and the end of the time period 301 .
  • the rate of decrease in rotational speed of the motor 18 need not be constant over the entire time period 303 .
  • the rate 3032 of decrease in rotational speed of the motor 18 may be gently changed in the beginning and the end of the time period 303 .
  • the control profile 30 need not necessarily be generated in the pump unit 12 .
  • the upper ECU 14 may include the generation circuit 202 that generates the control profile 30 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
US15/382,088 2015-12-22 2016-12-16 Electric pump system Abandoned US20170175745A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015249628A JP2017115618A (ja) 2015-12-22 2015-12-22 ポンプ駆動システム
JP2015-249628 2015-12-22

Publications (1)

Publication Number Publication Date
US20170175745A1 true US20170175745A1 (en) 2017-06-22

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US (1) US20170175745A1 (de)
JP (1) JP2017115618A (de)
CN (1) CN106949041A (de)
DE (1) DE102016124911A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6956032B2 (ja) * 2018-03-13 2021-10-27 住友精密工業株式会社 定圧液供給装置
US10947702B2 (en) * 2018-09-05 2021-03-16 Hitachi Construction Machinery Tierra Co., Ltd Hydraulic drive system for electrically driven hydraulic work machine

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5574352A (en) * 1993-07-20 1996-11-12 Hitachi, Ltd. Frequency control method for inverter and apparatus therefor
US20020088241A1 (en) * 2001-01-09 2002-07-11 Ken Suitou Apparatus and method for controlling electric compressor
US20020094910A1 (en) * 2001-01-17 2002-07-18 Toyota Jidosha Kabushiki Kaisha Hydraulic pressure control apparatus for automatic transmission of vehicle
US6679821B1 (en) * 1999-10-05 2004-01-20 Hitachi Koko Co., Ltd. Centrifugal separator and administration of user and actual operation of the same
US20070046248A1 (en) * 2005-09-01 2007-03-01 Stmicroelectronics, Inc. System and method for controlling an induction motor
US20100232982A1 (en) * 2007-12-20 2010-09-16 Mitsubishi Heavy Industries, Ltd. Control device for electric compressor and start control method of electric compressor
US20110135499A1 (en) * 2009-12-04 2011-06-09 Hyundai Motor Company Apparatus and method for controlling operation of electric oil pump
US20140311463A1 (en) * 2011-12-28 2014-10-23 Mitsubishi Heavy Industries, Ltd. Electric supercharging device
US9415801B2 (en) * 2013-11-22 2016-08-16 Jtekt Corporation Power steering system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5312012A (en) * 1976-07-21 1978-02-03 Seiko Instr & Electronics Ltd Controlling motor speed
JPS57163696A (en) * 1981-03-31 1982-10-07 Tominaga Oil Pump Method of controlling lubricator
JPS63309274A (ja) * 1987-03-20 1988-12-16 Sharp Corp 輸液ポンプ
JPH025776A (ja) * 1988-06-24 1990-01-10 Sato Seiki Kk 定量給液装置
JP3562324B2 (ja) * 1998-07-14 2004-09-08 日産自動車株式会社 自動変速機のオイルポンプ回転数制御装置
JP4724945B2 (ja) 2001-04-17 2011-07-13 コベルコ建機株式会社 油圧回路
CN103588352B (zh) * 2013-09-03 2015-01-07 北京工业大学 城市污水反硝化除磷和短程硝化厌氧氨氧化两级回流式同步脱氮除磷装置及工艺
JP6094463B2 (ja) * 2013-12-09 2017-03-15 株式会社島津製作所 材料試験機

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5574352A (en) * 1993-07-20 1996-11-12 Hitachi, Ltd. Frequency control method for inverter and apparatus therefor
US6679821B1 (en) * 1999-10-05 2004-01-20 Hitachi Koko Co., Ltd. Centrifugal separator and administration of user and actual operation of the same
US20020088241A1 (en) * 2001-01-09 2002-07-11 Ken Suitou Apparatus and method for controlling electric compressor
US20020094910A1 (en) * 2001-01-17 2002-07-18 Toyota Jidosha Kabushiki Kaisha Hydraulic pressure control apparatus for automatic transmission of vehicle
US20070046248A1 (en) * 2005-09-01 2007-03-01 Stmicroelectronics, Inc. System and method for controlling an induction motor
US20100232982A1 (en) * 2007-12-20 2010-09-16 Mitsubishi Heavy Industries, Ltd. Control device for electric compressor and start control method of electric compressor
US20110135499A1 (en) * 2009-12-04 2011-06-09 Hyundai Motor Company Apparatus and method for controlling operation of electric oil pump
US20140311463A1 (en) * 2011-12-28 2014-10-23 Mitsubishi Heavy Industries, Ltd. Electric supercharging device
US9415801B2 (en) * 2013-11-22 2016-08-16 Jtekt Corporation Power steering system

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