EP2662567A1 - Dispositif de pompe électrique - Google Patents

Dispositif de pompe électrique Download PDF

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Publication number
EP2662567A1
EP2662567A1 EP12732001.8A EP12732001A EP2662567A1 EP 2662567 A1 EP2662567 A1 EP 2662567A1 EP 12732001 A EP12732001 A EP 12732001A EP 2662567 A1 EP2662567 A1 EP 2662567A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic pressure
oil pump
hydraulic
motor
supplied
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP12732001.8A
Other languages
German (de)
English (en)
Inventor
Fukami Imai
Kengo Uda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JTEKT Corp
Original Assignee
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
Publication date
Application filed by JTEKT Corp filed Critical JTEKT Corp
Publication of EP2662567A1 publication Critical patent/EP2662567A1/fr
Withdrawn legal-status Critical Current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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • F04B49/02—Stopping, starting, unloading or idling control
    • 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
    • F04B49/065—Control using electricity and making use of computers
    • 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
    • F04B49/08—Regulating by delivery pressure

Definitions

  • the present invention relates to an electric pump device.
  • hydraulic pressure has been supplied to a hydraulic operating device such as a transmission by a main pump, which is driven by an engine, and an electric pump device, which uses a motor as a driving source, in a vehicle having a so-called idle stop function of automatically stopping an engine at the time of the temporary stop of a vehicle (for example, see PTL 1).
  • the main pump and an oil pump of the electric pump device are connected to a common hydraulic circuit that is used to supply hydraulic pressure to the hydraulic operating device.
  • hydraulic pressure is supplied to the hydraulic operating device by the main pump and the electric pump device generally stops. Meanwhile, since the main pump stops at the time of the stop of an engine such as idle stop, the supply of hydraulic pressure to the hydraulic operating device is ensured by the electric pump device.
  • the invention has been made to solve the above-mentioned problem, and an object of the invention is to provide an electric pump device that can suppress the generation of vibration or noise.
  • an electric pump device that includes an oil pump generating hydraulic pressure, a motor driving the oil pump, and a controller controlling the operation of the oil pump through the supply of drive power to the motor, and is provided in a hydraulic circuit supplying operating oil to a hydraulic operating device together with another oil pump.
  • the controller operates the oil pump to complement the supply of hydraulic pressure to the hydraulic operating device when the supply of hydraulic pressure to the hydraulic operating device performed by the another oil pump is stopped.
  • the controller performs a pressure reducing control gradually reducing hydraulic pressure supplied from the oil pump when the supply of hydraulic pressure to the hydraulic operating device is switched to the another oil pump from the oil pump.
  • the pressure reducing control is performed, so that hydraulic pressure supplied from the oil pump is gradually reduced. Accordingly, the occurrence of the sudden fluctuation of hydraulic pressure in the hydraulic circuit is suppressed unlike when the electric pump device is immediately stopped. Therefore, the supply of hydraulic pressure to the hydraulic operating device is smoothly switched to the another oil pump from the electric pump device, so that it is possible to suppress the generation of vibration or noise.
  • the motor may be formed of a sensorless type brushless motor
  • the controller may estimate the rotational position of a rotor on the basis of induced voltages generated at motor coils, and the controller may maintain a motor angular velocity at which the rotational position can be detected on the basis of the induced voltages while hydraulic pressure is supplied to the hydraulic operating device by the another oil pump.
  • the rotor is forcibly rotated by the switching (forcible commutation) of the directions and phases of current supplied to the respective motor coils in a predetermined order regardless of the rotational position of the rotor, so that the sensorless type brushless motor is started. Further, since the motor angular velocity (the rotation speed of the rotor) is increased and it is possible to detect the rotational position of the rotor on the basis of the induced voltages generated at the motor coils, it is possible to control hydraulic pressure. For this reason, if the motor is completely stopped, it takes time before hydraulic pressure can be supplied from the electric pump device.
  • the motor angular velocity is maintained at angular velocity at which the rotational position of the rotor can be detected on the basis of the induced voltages. Accordingly, when the supply of hydraulic pressure to the hydraulic operating device from the another oil pump is reduced, it is possible to promptly supply hydraulic pressure from the oil pump of the electric pump device.
  • hydraulic pressure corresponding to the angular velocity at which the rotational position of the rotor can be detected on the basis of the induced voltages continues to be supplied from the oil pump. Accordingly, as compared to a case where hydraulic pressure supplied from the oil pump is zero, it is possible to suppress the occurrence of the fluctuation of hydraulic pressure when the supply of hydraulic pressure to the hydraulic operating device is switched to the another oil pump from the electric pump device.
  • An electric pump device 1 shown in Fig. 1 is mounted on a vehicle (not shown) having a so-called idle stop function of automatically stopping an engine 2 at the time of the temporary stop of a vehicle.
  • the electric pump device 1 is provided in a hydraulic circuit 5 supplying hydraulic pressure (operating oil) to a transmission mechanism 4 (a continuously variable transmission in this embodiment) that is a hydraulic operating device, together with a main pump 3 as the other oil pump that is driven by the engine 2. Further, the electric pump device 1 supplies hydraulic pressure to the transmission mechanism 4 instead of the main pump 3, at the time of the stop of the engine 2 such as idling stop.
  • the main pump 3 is connected to the engine 2 so as to be driven by the engine 2, and sucks operating oil from an oil pan 11 by the drive of the engine 2 and supplies hydraulic pressure to the transmission mechanism 4.
  • the electric pump device 1 includes an oil pump 12 that generates hydraulic pressure, an electric motor 13 that drives the oil pump 12, and an EOP (electric oil pump) ECU 14 as a controller that controls the operation of the electric motor 13. Further, when the oil pump 12 is driven by the electric motor 13, the electric pump device 1 sucks operating oil from the oil pan 11 and supplies hydraulic pressure to the transmission mechanism 4. Meanwhile, a check valve 16, which prevent the operating oil from flowing backward at the time of the stop of the electric motor 13, is provided on an outlet oil passage 15 of the oil pump 12.
  • a host ECU 18 is connected to the engine 2.
  • Various sensor values such as vehicle speed and an accelerator opening, are input to the host ECU 18, and the host ECU 18 controls the operation of the engine 2 and the transmission mechanism 4 on the basis of these respective state quantities. For example, the host ECU 18 stops the engine 2 when a predetermined stop condition is satisfied, and performs an idle-stop control restarting the engine 2 when a predetermined restart condition is satisfied.
  • the EOP ECU 14 is connected to the host ECU 18. Furthermore, the EOP ECU 14 is adapted to supply hydraulic pressure to the transmission mechanism 4 from the oil pump 12 by driving the electric motor 13 at the time of idle stop on the basis of a control signal output from the host ECU 18.
  • the EOP ECU 14 includes a drive circuit 21 that supplies three-phase drive power to the electric motor 13, and a microcomputer 22 that drives the electric motor 13 by outputting motor control signals to the drive circuit 21. Meanwhile, in this embodiment, the EOP ECU 14 supplies drive power to the electric motor 13 by 120°-rectangular wave current supply where a current supply phase and a current supply direction are switched for every 120° (electrical angle).
  • a sensorless type brushless motor which does not include a rotation sensor detecting the rotational position of a rotor 24, is employed as the electric motor 13, and the microcomputer 22 estimates the rotational position of the rotor 24 on the basis of induced voltages that are generated at motor coils 25u, 25v, and 25w of the respective phases.
  • a well-known PWM inverter in which three switching arms corresponding to the motor coils 25u, 25v, and 25w of the respective phases are connected in parallel while a pair of switching elements connected in series are used as a basic unit (switching arm), is employed as the drive circuit 21. That is, the motor control signals output from the microcomputer 22 define the on/off-states of the switching elements of the respective phases that form the drive circuit 21 (duty ratios of the switching arms of the respective phases). Moreover, the drive circuit 21 is adapted so that drive power based on the current supply phase, the current supply direction, and the duty ratio corresponding to a switching pattern thereof is output to the electric motor 13.
  • Voltage sensors 26u, 26v, and 26w which detect terminal voltages Vu, Vv, and Vw of the motor coils 25u, 25v, and 25w, are connected to the microcomputer 22.
  • the microcomputer 22 estimates the rotational position (rotational angle) of the rotor 24 on the basis of induced voltages (back-electromotive forces) of the respective motor coils 25u, 25v, and 25w that are detected by the voltage sensors 26u, 26v, and 26w.
  • the microcomputer 22 estimates the rotational position of the rotor 24 by a well-known method of detecting a point of time (zero-cross point) where an induced voltage corresponds to a reference potential. Further, the microcomputer 22 determines a switching pattern according to the estimated rotational position of the rotor 24.
  • a current sensor 27, which detects an actual current value I of current supplied to the electric motor 13, and the host ECU 18 are connected to the microcomputer 22.
  • the microcomputer 22 determines a duty ratio, which corresponds to a deviation between a current command value I* and the actual current value I, by performing a feedback control making the actual current value I follow the current command value I* that is included in the control signal output from the host ECU 18.
  • the microcomputer 22 outputs motor control signals, which represent the switching pattern and the duty ratio determined in this way, to the drive circuit 21. Accordingly, three-phase drive power is supplied to the electric motor 13 from the drive circuit 21 and the electric motor 13 is driven, so that hydraulic pressure is supplied from the oil pump 12.
  • the EOP ECU 14 performs a pressure reducing control gradually reducing hydraulic pressure Po supplied from the oil pump 12 without immediately stopping the operation of the electric motor 13 even though a control signal stopping the electric motor 13 is input from the host ECU 18. Specifically, in the pressure reducing control of this embodiment, the EOP ECU 14 reduces the hydraulic pressure Po while continuously changing the reduction rate of the hydraulic pressure Po supplied from the oil pump 12.
  • the EOP ECU 14 is adapted to maintain a motor angular velocity ⁇ (the rotation speed of the rotor 24) at a standby angular velocity ⁇ s at which the position of the rotor can be detected on the basis of induced voltages generated at the motor coils 25u, 25v, and 25w.
  • the pressure reducing control is performed when the control signal stopping the supply of hydraulic pressure performed by the oil pump 12 is input to the EOP ECU 14 from the host ECU 18 at a time t. Accordingly, the hydraulic pressure Po supplied from the oil pump 12 is gradually reduced. Furthermore, when hydraulic pressure is reduced to standby hydraulic pressure Pos that is supplied from the oil pump 12 by the electric motor 13 rotating at the standby angular velocity ⁇ s, hydraulic pressure is maintained at the standby hydraulic pressure Pos.
  • the pressure reducing control is performed, so that the hydraulic pressure Po supplied from the oil pump 12 of the electric pump device 1 is gradually reduced. Accordingly, the occurrence of the sudden fluctuation of hydraulic pressure in the hydraulic circuit 5 is suppressed unlike when the electric pump device 1 is immediately stopped. Therefore, the supply of hydraulic pressure to the transmission mechanism 4 is smoothly switched to the main pump 3 from the electric pump device 1, so that it is possible to suppress the generation of vibration or noise.
  • the rotor 24 is forcibly rotated by the switching (forcible commutation) of the directions and phases of current supplied to the respective motor coils 25u, 25v, and 25w in a predetermined order regardless of the rotational position of the rotor 24, so that the sensorless type brushless motor is started. Further, since the motor angular velocity ⁇ is increased and it is possible to detect the rotational position of the rotor 24 on the basis of the induced voltages generated at the motor coils 25u, 25v, and 25w, it is possible to control hydraulic pressure. For this reason, if the electric motor 13 is completely stopped, time is taken until hydraulic pressure can be supplied from the electric pump device 1.
  • the motor angular velocity ⁇ is maintained at the standby angular velocity ⁇ s at which the rotational position of the rotor 24 can be detected on the basis of the induced voltages. Accordingly, when the supply of hydraulic pressure to the transmission mechanism 4 from the main pump 3 is reduced, it is possible to promptly supply hydraulic pressure from the electric pump device 1.
  • the standby hydraulic pressure Pos corresponding to the standby angular velocity ⁇ s continues to be supplied from the oil pump 12. Accordingly, compared to a case where the hydraulic pressure Po supplied from the oil pump 12 is zero, it is possible to suppress the occurrence of the fluctuation of hydraulic pressure when the supply of hydraulic pressure to the transmission mechanism 4 is switched to the main pump 3 from the electric pump device 1.
  • the hydraulic pressure Po has been reduced while the reduction rate of the hydraulic pressure Po supplied from the oil pump 12 is continuously changed.
  • the invention is not limited thereto, and the hydraulic pressure Po may be reduced to the standby hydraulic pressure Pos at a constant reduction rate and the standby hydraulic pressure Pos may be maintained. Further, as long as the hydraulic pressure Po is gradually reduced, the pressure reducing control may be performed in any aspect.
  • hydraulic pressure may be temporarily maintained at a predetermined hydraulic pressure during the reduction of the hydraulic pressure Po supplied from the oil pump 12.
  • a plurality of predetermined hydraulic pressures may be set so that hydraulic pressure is reduced stepwise. It is possible to reliably suppress the occurrence of the sudden fluctuation of hydraulic pressure in the hydraulic circuit 5 by reducing the hydraulic pressure stepwise while temporarily maintaining hydraulic pressure during the reduction of the hydraulic pressure Po in this way.
  • the hydraulic pressure Po supplied from the oil pump 12 may be reduced after being increased once.
  • the hydraulic pressure Pm supplied from the main pump 3 is higher than the hydraulic pressure Po, it is possible to make these hydraulic pressures Po and Pm be close to each other when pressure reducing control is performed. Accordingly, it is possible to suitably suppress the fluctuation of hydraulic pressure.
  • the EOP ECU 14 has maintained the motor angular velocity ⁇ at the standby angular velocity ⁇ s even when hydraulic pressure is supplied to the transmission mechanism 4 by the main pump 3.
  • the invention is not limited thereto, and the electric motor 13 may be completely stopped.
  • the motor angular velocity ⁇ has been maintained at the standby angular velocity ⁇ s after the pressure reducing control is performed.
  • the invention is not limited thereto, and the electric motor 13 may be controlled so as to make the motor angular velocity ⁇ immediately become the standby angular velocity ⁇ s and the motor angular velocity ⁇ (standby hydraulic pressure Pos) may be maintained when the supply of hydraulic pressure to the transmission mechanism 4 is switched to the main pump 3 from the oil pump 12. Even in this structure, it is possible to obtain the functional effect according to (2) of the above-mentioned embodiment.
  • the invention has been applied to the electric pump device 1 that is connected to the hydraulic circuit 5 together with the main pump 3 driven by the engine 2.
  • the invention is not limited thereto, and may be applied to the electric pump device that is connected to a hydraulic circuit together with a pump except for the main pump 3.
  • the hydraulic circuit 5 may be provided with a plurality of pumps except for the electric pump device 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Transmission Device (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP12732001.8A 2011-01-04 2012-01-04 Dispositif de pompe électrique Withdrawn EP2662567A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011000125A JP2012140912A (ja) 2011-01-04 2011-01-04 電動ポンプ装置
PCT/JP2012/050034 WO2012093677A1 (fr) 2011-01-04 2012-01-04 Dispositif de pompe électrique

Publications (1)

Publication Number Publication Date
EP2662567A1 true EP2662567A1 (fr) 2013-11-13

Family

ID=46457528

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12732001.8A Withdrawn EP2662567A1 (fr) 2011-01-04 2012-01-04 Dispositif de pompe électrique

Country Status (5)

Country Link
US (1) US20130280101A1 (fr)
EP (1) EP2662567A1 (fr)
JP (1) JP2012140912A (fr)
CN (1) CN103299075A (fr)
WO (1) WO2012093677A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10746171B2 (en) 2015-05-29 2020-08-18 Mitsubishi Electric Corporation Control device for electric motor and hydraulic pressure supply system
JP6594381B2 (ja) * 2017-08-10 2019-10-23 本田技研工業株式会社 油圧制御装置
IT201900012849A1 (it) * 2019-07-25 2021-01-25 Dab Pumps Spa Elettropompa con accessori personalizzabili

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6443224A (en) * 1987-08-12 1989-02-15 Hitachi Ltd Operation of electric cleaner
JPH05180159A (ja) * 1992-01-07 1993-07-20 Ebara Densan:Kk ポンプの運転方法
JP3286175B2 (ja) * 1996-08-26 2002-05-27 株式会社山武 燃焼制御装置
JP3750428B2 (ja) * 1999-07-26 2006-03-01 日産自動車株式会社 車両
JP2002031064A (ja) * 2000-07-19 2002-01-31 Tsurumi Mfg Co Ltd 電動ポンプのウォータハンマ防止装置
JP3940267B2 (ja) * 2001-02-21 2007-07-04 株式会社ジェイテクト 同期モータの起動制御装置およびその装置を用いた自動車駆動系の作動流体制御用電動ポンプ
JP2002310272A (ja) * 2001-04-13 2002-10-23 Aisin Seiki Co Ltd 車両の自動変速機における油圧供給装置
US6926639B2 (en) * 2003-07-02 2005-08-09 Visteon Global Technologies, Inc. Vehicle control method
JP2010078088A (ja) 2008-09-26 2010-04-08 Jtekt Corp 無段変速機の油圧ポンプ装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012093677A1 *

Also Published As

Publication number Publication date
US20130280101A1 (en) 2013-10-24
CN103299075A (zh) 2013-09-11
JP2012140912A (ja) 2012-07-26
WO2012093677A1 (fr) 2012-07-12

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