US20190316578A1 - Electric pump device - Google Patents

Electric pump device Download PDF

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Publication number
US20190316578A1
US20190316578A1 US16/348,279 US201616348279A US2019316578A1 US 20190316578 A1 US20190316578 A1 US 20190316578A1 US 201616348279 A US201616348279 A US 201616348279A US 2019316578 A1 US2019316578 A1 US 2019316578A1
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Prior art keywords
motor
rotational speed
temperature
specified
control
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Abandoned
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US16/348,279
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English (en)
Inventor
Makoto Araki
Yoshitaka KURAYA
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TBK Co Ltd
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TBK Co Ltd
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Assigned to TBK CO., LTD. reassignment TBK CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARAKI, MAKOTO, KURAYA, Yoshitaka
Publication of US20190316578A1 publication Critical patent/US20190316578A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • F04B49/10—Other safety measures
    • F04B49/103—Responsive to speed
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/20—Arrangements for starting
    • H02P6/21—Open loop start
    • 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
    • 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
    • F04B2203/0201—Current
    • 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
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/10—Inlet temperature
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/14—Viscosity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/30—Control parameters, e.g. input parameters

Definitions

  • the present invention relates to an electric pump device driven by an electric motor.
  • Patent Document 1 Japanese Laid-Open Patent Publication No. 2014-241657
  • the present invention was made, and an object thereof is to provide an electric pump device which can suppress excess output of the motor.
  • an electric pump device comprises a fluid pump that discharges fluid; a motor that drives the fluid pump; and a control unit that controls the value of current supplied to the motor to control rotation of the motor, thereby controlling the flow rate of fluid discharged from the pump.
  • the control unit drives the motor by open loop control that restricts the value of current supplied to the motor to lower than a predetermined upper limit, and when the rotational speed of the motor has come near to the target rotational speed, the control unit drives the motor by feedback control that keeps the rotational speed at a steady rotational speed.
  • the electric pump device is preferably configured such that specified rotational frequencies for the motor are set beforehand in the control unit and that in the open loop control, the specified rotational speed of the motor is increased stepwise to supply current of a value according to the specified rotational speed to the motor.
  • the electric pump device is preferably configured to comprise a temperature detector that detects a temperature of fluid and such that at startup of the motor, when the temperature of the fluid detected by the temperature detector is lower than a specified temperature, the open loop control is performed for a relatively long time, and that when the temperature of the fluid detected by the temperature detector is higher than or equal to the specified temperature, the open loop control is performed for a relatively short time.
  • the motor is driven by open loop control that restricts the value of current supplied to the motor to lower than a predetermined upper limit, and thus the load of the motor at startup can be reduced so that the output of the motor can be suppressed.
  • the electric pump can be started stably without going beyond the rated output even when the fluid is relatively high in viscosity such as at the time of cold start.
  • the temperature of the fluid can be gradually raised (the viscosity resistance of the fluid can be gradually decreased) over time without a rapid increase in the load of the fluid pump, so that the electric pump device can be efficiently started.
  • transition to feedback control when the temperature of the fluid is lower than a specified temperature, after the open loop control is performed for a relatively long time, transition to feedback control is made, and when the temperature of the fluid is higher than or equal to the specified temperature, after the open loop control is performed for a relatively short time, transition to feedback control is made, and thus optimum control according to a physical property (the viscosity resistance) of the fluid can be performed, so that the motor can be made to quickly reach steady rotation without wasting electric power.
  • a physical property the viscosity resistance
  • FIG. 1 is a block diagram showing schematically the configuration of an electric pump according to the present embodiment.
  • FIG. 2 is a flow chart showing the flow of operation processing at the startup of the electric pump.
  • FIG. 3 is a schematic diagram showing an example control table of the electric pump.
  • FIG. 4 is a graph showing the way that a specified rotational speed and duty ratio vary against the elapsed time from the startup of the electric pump.
  • FIG. 1 shows an electric pump 1 according to one embodiment of the present invention, and first the configuration of the electric pump 1 according to the present embodiment will be schematically described with reference to this FIG. 1 .
  • the electric pump 1 is constituted essentially by an oil pump 10 discharging oil, a motor 20 as a driving source driving the oil pump 10 , and a control unit (also called a driver) 30 controlling the rotation of the motor 20 .
  • the electric pump 1 increases and decreases the discharge rate (flow rate) of the oil pump 10 according to the rising and lowering of the rotational speed of the motor 20 . That is, as the rotational speed of the motor 20 rises, the discharge rate of the oil pump 10 increases, and as the rotational speed of the motor 20 lowers, the discharge rate of the oil pump 10 decreases.
  • the oil pump 10 is connected to the rotary shaft of the motor 20 and takes in oil from an oil tank (not shown) by drive force (turning force) transmitted from the motor 20 to discharge into the outside (a cooling system, lubrication system, or operating system).
  • the oil discharged from the oil pump 10 into the outside is made to return to the oil tank so as to circulate.
  • a gear pump that discharges fluid in response to the rotation of a pair of gears engaging with each other
  • a centrifugal pump that discharges fluid in response to the rotation of an impeller, or so on is applied as the oil pump 10 .
  • the motor 20 is, for example, a three-phase brushless DC motor and comprises coils of three phases (U phase, V phase, W phase) and a rotor constituted by a permanent magnet magnetized with an N pole and an S pole.
  • the motor 20 is configured such that the rotor rotates by current conduction through the coils of the phases being sequentially switched.
  • the motor 20 of the present example is a so-called sensorless-type brushless DC motor, which does not use a position detecting element such as a Hall element, and detects the rotational position of the rotor by using an inductive voltage (back electromotive force) occurring across each coil and, using magnetic-pole-position information obtained based on that, switches current conduction for the phases.
  • Such a DC brushless motor is conventionally, widely known, and hence detailed description thereof is omitted here.
  • the control unit 30 is configured to comprise a drive circuit 31 to drive the motor 20 and a microcomputer 32 to control the drive circuit 31 .
  • the control unit 30 is constituted as a control board on which various electronic and electrical components are mounted. Note that the control unit 30 or part of the control unit 30 may be constituted as an entity separate from the electric pump 1 .
  • the drive circuit 31 is a driver configured by connecting switching elements corresponding to the phases (U phase, V phase, W phase) of the motor 20 in parallel to a battery (power supply) 40 .
  • the switching elements of the drive circuit 31 are controlled to be on/off based on a motor control signal (PWM signal) transmitted from the microcomputer 32 that is a higher-level unit, thereby supplying current (three-phase excitation current) to the motor 20 to rotationally drive the motor 20 .
  • PWM signal motor control signal
  • the switching elements for example, MOSFETs or the like are suitably used, but other transistors may be used.
  • the microcomputer 32 transmits the motor control signal (PWM signal) according to a specified rotational speed set in a control table or the like to the drive circuit 31 so as to control the switching elements of the respective phases of the drive circuit 31 to be on/off, thereby PWM controlling the motor 20 .
  • the microcomputer 32 controls the duty ratio of the motor control signal to control the values of currents supplied to the coils of the respective phases of the motor 20 (to control the voltage applied to the motor 20 in a pseudo manner) so as to increase/decrease the rotational speed of the motor 20 . That is, the microcomputer 32 controls the amounts of currents supplied to the motor 20 (that is, the rotational speed of the motor 20 ) using the duty ratio of the PWM signal outputted to the drive circuit 31 as a control amount.
  • the microcomputer 32 having inputted thereto the above inductive voltage (back electromotive force) occurring across the coil of each phase of the motor 20 , detects the actual rotational speed of the motor 20 .
  • An oil temperature detector (oil temperature sensor) 50 to detect the temperature of oil is electrically connected to the microcomputer 32 , which is configured such that detection information of the oil temperature detector 50 is inputted thereto.
  • the oil changes in viscosity according to its temperature and has a property in which, as the oil temperature becomes lower, the viscosity becomes higher (the viscosity resistance increases).
  • the oil temperature detector 50 of the present example functions as a viscosity estimating means for estimating the viscosity (a physical property) of oil based on the temperature of the oil.
  • the oil temperature detector 50 may be mounted inside the electric pump 1 . Further, the oil temperature detector 50 may be either of a contact type and a non-contact type.
  • the microcomputer 32 selectively switches the control method of the motor 20 between open loop control and closed loop control (open loop control) to drive the motor 20 .
  • open loop control closed loop control
  • the microcomputer 32 drives the motor 20 by open loop control until the rotational speed of the motor 20 reaches a preset target rotational speed (hereinafter called a transition-to-feedback rotational speed).
  • the open loop control is a control method which drives the motor 20 at a specified rotational speed (duty ratio) set beforehand.
  • the specified rotational speed (the duty ratio of the motor control signal) is increased stepwise (gradually) to gradually raise the rotational speed of the motor 20 so that the value of current supplied to the coil of each phase of the motor 20 does not exceed a predetermined upper limit (rated current value).
  • a variety of information used in the open loop control is stored in a control table provided in the storage unit of the control unit 30 .
  • the above control table there are prepared a for-low-temperature control table (see FIG.
  • the open-loop control is performed for a relatively long time.
  • the open-loop control is performed for a relatively short time. That is, in the for-low-temperature control table, the drive time of the motor 20 by open loop control is set to be a long time (e.g., about 10 times) as compared with the for-high-temperature control table.
  • the microcomputer 32 drives the motor 20 by feedback control to keep the actual rotational speed at the steady rotational speed (to control the deviation of the actual rotational speed from a steady rotational speed to be zero).
  • the microcomputer 32 performs open-loop control for a relatively short time and transitions to feedback control in response to the actual rotational speed of the motor 20 having reached the transition-to-feedback rotational speed.
  • FIG. 2 is a flow chart showing the flow of operation processing at the startup of the electric pump 1 ;
  • FIG. 3 is a schematic diagram showing the for-low-temperature control table; and
  • FIG. 4 is a graph showing the way that the specified rotational speed and duty ratio vary against the elapsed time from the startup of the electric pump when the for-low-temperature control table is set.
  • the processing of this flow chart is repeatedly performed with a predetermined period (e.g., every 10 ms).
  • the control unit 30 sets a control table (the for-low-temperature control table or the for-high-temperature control table) according to the oil temperature detected by the oil temperature detector 50 (step S 1 ). Specifically, the control unit 30 determines whether the oil temperature detected by the oil temperature detector 50 is lower than a specified temperature and, if it is lower than the specified temperature, sets the for-low-temperature control table and, if it is higher than or equal to the specified temperature, sets the for-high-temperature control table (not shown).
  • the specified temperature is set based on a characteristic of the electric pump 1 , the type of the oil, the usage environment, and the like. A description will be made below illustrating the case where the for-low-temperature control table ( FIG. 3 ) has been set.
  • the control unit 30 refers to the control table and sets the initial specified rotational speed therein (step S 2 ).
  • the control table as shown in FIG. 3 , a correspondence between specified rotational frequencies of the motor 20 , duty ratios for the specified rotational frequencies, and drive times of the motor 20 at the specified rotational frequencies (called specified drive times) is specified.
  • the control unit 30 reads the initial specified rotational speed (first specified rotational speed) from the control table and sets 50 rpm as the current specified rotational speed.
  • Rotational frequencies of from the initial rotational speed (50 rpm) to the transition-to-feedback rotational speed (1800 rpm) are set as specified rotational frequencies in this control table.
  • the duty ratios are set at such values that the value of current supplied to the motor 20 does not exceed the rated current value (maximum rated current value).
  • control unit 30 refers to the control table and sets the duty ratio corresponding to the current specified rotational speed (step S 3 ). Specifically, the control unit 30 reads the duty ratio corresponding to the first specified rotational speed (50 rpm) from the control table and sets 18% as the duty ratio of the motor control signal.
  • control unit 30 drives the motor 20 based on PWM control with the duty ratio set at the above step S 3 (step S 4 ).
  • the magnitude of the duty ratio is related to increase/decrease in the value of current supplied to the motor 20 (that is, increase/decrease in the rotational speed of the motor 20 ).
  • the control unit 30 refers to the control table and determines whether the motor 20 has been driven for the specified drive time at the current specified rotational speed (step S 5 ). Specifically, the control unit 30 determines whether the motor 20 has been driven for the specified drive time (10 ms) at the current specified rotational speed (50 rpm). In the present embodiment, 10 ms is set as the specified drive time of the motor 20 basically for each specified rotational speed. However, as shown in FIGS. 3 and 4 , for the predetermined, specified rotational frequencies (1100 rpm, 1350 rpm, 1750 rpm), the specified drive time is set to be relatively long in order to promote the temperature rise of the oil through the circulation (turnover) of the oil.
  • the specified rotational speed is gradually increased every minute time (10 ms), and when reaching the predetermined, specified rotational speed, the motor 20 is driven over a relatively long time, so that the temperature rise of the oil is promoted while the out-of-step and overload of the motor 20 are prevented.
  • step S 6 the control unit 30 determines whether the specified rotational speed set at the above step S 2 has reached the transition-to-feedback rotational speed (step S 6 ). At this stage, since the specified rotational speed (the initial rotational speed: 50 rpm) is lower than the transition-to-feedback rotational speed (1800 rpm), the process returns to step S 2 .
  • control unit 30 refers to the control table and sets the next specified rotational speed therein (step S 2 ). Specifically, the control unit 30 reads the next specified rotational speed (second specified rotational speed) from the control table and sets 60 rpm as the current specified rotational speed.
  • control unit 30 refers to the control table and sets the duty ratio corresponding to the current specified rotational speed (step S 3 ). Specifically, the control unit 30 reads the duty ratio corresponding to the second specified rotational speed (60 rpm) from the control table and sets 22.5% as the duty ratio of the motor control signal.
  • control unit 30 drives the motor 20 based on PWM control with the duty ratio set at the above step S 3 (step S 4 ).
  • control unit 30 refers to the control table and determines whether the motor 20 has been driven for the specified time at the current specified rotational speed (step S 5 ). Specifically, the control unit 30 determines whether the motor 20 has been driven for the specified drive time (10 ms) at the current specified rotational speed (60 rpm).
  • step S 6 the control unit 30 determines whether the specified rotational speed set at the above step S 2 has reached the transition-to-feedback rotational speed (step S 6 ). At this stage, since the specified rotational speed (the second rotational speed: 60 rpm) is lower than the transition-to-feedback rotational speed (1800 rpm), the process returns to step S 2 again.
  • steps S 2 to S 6 open loop control
  • the motor 20 is driven by PWM control with the duty ratio corresponding to the set, specified rotational speed.
  • the oil is circulated, and because of the heat of friction with the drive portions (such as a rotor and an impeller) of the oil pump 10 and heat generation in the motor 20 , battery 40 , and engine, the oil is heated, so that the oil temperature gradually rises. As the oil temperature rises in this way, the viscosity of the oil decreases, so that the pump load is reduced.
  • the control unit 30 determines whether the actual rotational speed of the motor 20 has reached the transition-to-feedback rotational speed, that is, whether the actual rotational speed of the motor 20 coincides with the specified rotational speed (step S 7 ). On the other hand, when the actual rotational speed of the motor 20 has not reached the transition-to-feedback rotational speed (No at step S 6 ), the process of steps S 2 to S 7 (open loop control) is repeated as above until the actual rotational speed of the motor 20 reaches the transition-to-feedback rotational speed.
  • the open loop control is switched to feedback control (closed loop control), and steady rotation processing is performed (step S 8 ).
  • the duty ratio of the PWM signal is controlled (the value of current supplied to the motor 20 is controlled) based on the deviation (rotation deviation) of the actual rotational speed of the motor 20 from a steady rotational speed (4500 rpm) so that the actual rotational speed of the motor 20 is kept at the steady rotational speed.
  • the motor 20 is driven by the open loop control that restricts the value of current supplied to the motor 20 to lower than a predetermined upper limit (rated current value), and thus the load of the motor 20 at startup can be reduced so that the output of the motor 20 can be suppressed.
  • a predetermined upper limit rated current value
  • the temperature of the oil can be gradually raised (the viscosity resistance of the oil can be gradually decreased) over time without a rapid increase in the load of the oil pump 10 , so that the electric pump 1 can be efficiently started.
  • the temperature of the oil is lower than a specified temperature, after the open loop control is performed for a relatively long time, transition to feedback control is made, and if the temperature of the oil is higher than or equal to the specified temperature, after the open loop control is performed for a relatively short time, transition to feedback control is made, and thus optimum control according to a physical property (the viscosity resistance) of the oil can be performed, so that the motor 20 can be made to quickly reach steady rotation without wasting electric power.
  • a physical property the viscosity resistance
  • the above embodiment illustrates and describes the sensorless three-phase brushless DC motor as the drive source of the electric pump, not being limited to this configuration, for example, another DC motor such as a two-phase brushless DC motor may be used, or a DC motor comprising a position detecting element (rotation detecting means) such as a Hall element may be used as needed.
  • a DC motor comprising a position detecting element (rotation detecting means) such as a Hall element may be used as needed.
  • a control table (the for-low-temperature control table or the for-high-temperature control table) is set according to the temperature of the oil (detected oil temperature)
  • the electric pump may be configured such that the for-low-temperature control table is always set regardless of the temperature of the oil at the startup of the electric pump.
  • the electric pump may be configured such that the for-low-temperature control table is always set regardless of the temperature of the oil at the first startup of the electric pump and that the for-low-temperature control table or the for-high-temperature control table is set according to the temperature of the oil at the second and later startups of the electric pump.
  • the electric pump may be configured such that feedback control based on the deviation of the actual current value from the steady current value is performed may be made.
  • transition from open loop control to feedback control is made when the actual rotational speed of the motor has reached the transition-to-feedback rotational speed as a target rotational speed
  • the target rotational speed can be set as needed.
  • the electric pump may be configured such that transition from open loop control to feedback control is made when the actual rotational speed of the motor has reached a rotational speed lower or higher by a predetermined rotational speed than the transition-to-feedback rotational speed, or that transition from open loop control to feedback control is made when the rotational speed of the motor has got into a predetermined range with the transition-to-feedback rotational speed as the center.
  • the electric pump may be configured such that transition from open loop control to feedback control is made when the elapsed time from the start of motor drive has reached a predetermined time.
  • control tables Although in the above embodiment two types of, for-low-temperature and for-high-temperature, control tables are prepared, more than two types of control tables may be prepared.
  • the values of various set rotational frequencies are examples and can be changed according to the type, function, required specifications, use conditions, and the like of the electric pump as needed.
  • the electric pump may be configured such that the viscosity of the oil is estimated based on another element such as the load current value or outside air temperature.
  • the values of the specified rotational frequencies, duty ratios, specified drive times, and the like illustrated in the above embodiment are complete examples and can be changed according to a characteristic of the electric pump, the type of oil, required specifications, and the like as needed.
  • the electric pump is not limited to an oil pump but can also be applied to other fluid pumps such as air pumps and water pumps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
US16/348,279 2016-11-14 2016-11-14 Electric pump device Abandoned US20190316578A1 (en)

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PCT/JP2016/083646 WO2018087908A1 (ja) 2016-11-14 2016-11-14 電動ポンプ装置

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US (1) US20190316578A1 (zh)
EP (1) EP3540224B1 (zh)
JP (1) JP6858199B2 (zh)
KR (1) KR20190080879A (zh)
CN (1) CN109952434B (zh)
WO (1) WO2018087908A1 (zh)

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US20220170455A1 (en) * 2019-02-21 2022-06-02 Renault S.A.S. Method for controlling the start-up of an oil pump
US11378070B2 (en) * 2016-09-30 2022-07-05 Nidec Tosok Corporation Control device, control method, motor, and electric oil pump

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JP7188996B2 (ja) * 2018-11-29 2022-12-13 トヨタ自動車株式会社 ウォータポンプの制御装置
CN111441926A (zh) * 2019-01-17 2020-07-24 上海汽车集团股份有限公司 一种混动变速箱驱动电机冷却电动油泵系统及控制方法
DE112020000307T5 (de) * 2019-02-26 2021-09-30 Koki Holdings Co., Ltd. Elektrisch angetriebenes arbeitsgerät
CN111669083B (zh) * 2020-06-17 2022-03-25 北京经纬恒润科技股份有限公司 一种油泵电机低温启动方法及装置

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CN109952434A (zh) 2019-06-28
EP3540224A4 (en) 2020-04-15
WO2018087908A1 (ja) 2018-05-17
JPWO2018087908A1 (ja) 2019-09-26
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EP3540224B1 (en) 2021-05-12
CN109952434B (zh) 2021-08-20

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