US20130156604A1 - Hydraulic pressure producing system for automatic transmission and control method thereof - Google Patents

Hydraulic pressure producing system for automatic transmission and control method thereof Download PDF

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Publication number
US20130156604A1
US20130156604A1 US13/711,131 US201213711131A US2013156604A1 US 20130156604 A1 US20130156604 A1 US 20130156604A1 US 201213711131 A US201213711131 A US 201213711131A US 2013156604 A1 US2013156604 A1 US 2013156604A1
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US
United States
Prior art keywords
hydraulic pump
hydraulic
hydraulic pressure
pump
control unit
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.)
Abandoned
Application number
US13/711,131
Other languages
English (en)
Inventor
Jong Hyun Kim
Sanglok Song
Seungjae Kang
Haksung LEE
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.)
Hyundai Motor Co
Kia Corp
Original Assignee
Hyundai Motor Co
Kia Motors 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 Hyundai Motor Co, Kia Motors Corp filed Critical Hyundai Motor Co
Assigned to HYUNDAI MOTOR COMPANY, KIA MOTORS CORPORATION reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANG, SEUNGJAE, KIM, JONG HYUN, LEE, HAKSUNG, SONG, SANGLOK
Publication of US20130156604A1 publication Critical patent/US20130156604A1/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
    • F04B49/02—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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefore
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefore
    • F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/4078—Fluid exchange between hydrostatic circuits and external sources or consumers
    • F16H61/4139—Replenishing or scavenging pumps, e.g. auxiliary charge pumps
    • 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
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F16H2061/0034—Accumulators for fluid pressure supply; Control thereof

Definitions

  • the present invention relates to a hydraulic pressure producing system for an automatic transmission and a control method thereof. More particularly, the present invention relates to a hydraulic pressure producing system for an automatic transmission and a control method thereof for improving energy efficiency.
  • the term “electric vehicle” represents all the vehicles that move by an electric power.
  • a hybrid vehicle is a vehicle with combined functions of a gasoline vehicle and an electric vehicle in order to overcome drawbacks of the gasoline vehicle and the electric vehicle. Therefore, a driver of a hybrid vehicle can select a gasoline engine drive mode or an electric motor drive mode.
  • the automatic transmission includes a number of frictional elements for performing multi-stage shifting.
  • the frictional elements are operated by hydraulic pressure.
  • the automatic transmission is connected to a mechanical hydraulic pump and an electric hydraulic pump so as to generate hydraulic pressure for shifting.
  • the electric hydraulic pump additionally supplies hydraulic pressure to the automatic transmission when hydraulic pressure supplied by the mechanical hydraulic pump is not sufficient for shifting. That is, the electric hydraulic pump selectively generates hydraulic pressure by necessity.
  • the electric hydraulic pump is operated at a low RPM that is predetermined based on a state of idle stop for improving responsiveness.
  • the idle stop is the condition in which power of the engine is not transmitted to the automatic transmission.
  • the electric hydraulic pump is always operated while the vehicle drives although the RPM of the electric hydraulic pump may be different according to the vehicle driving conditions. Therefore, electric power is consumed by the electric hydraulic pump even in the state of idle stop in which hydraulic pressure generated in the electric hydraulic pump is not required. That is, electric power may be unnecessarily consumed.
  • Various aspects of the present invention are directed to providing a hydraulic pressure producing system for an automatic transmission and a control method thereof having advantages of preventing electric power from being unnecessarily consumed.
  • various aspects of the present invention are directed to providing a hydraulic pressure producing system for an automatic transmission and a control method thereof having advantages of improving fuel consumption by recycling excessively generated hydraulic pressure.
  • a control method of a hydraulic pressure producing system for an automatic transmission having a first hydraulic pump adapted to generate a first hydraulic pressure for shifting, a second hydraulic pump adapted to additionally generate a second hydraulic pressure when the first hydraulic pressure supplied from the first hydraulic pump is insufficient fir shifting, an accumulator adapted to store hydraulic pressure excessively generated from the first hydraulic pump, and a control unit controlling the second hydraulic pump, may include operating the first hydraulic pump in a state of idle stop, predicting a finish point of the state of the idle stop, starting operation of the second hydraulic pump prior to a predetermined time from the predicted finish point, operating the second hydraulic pump with a predetermined maximum rotation speed, and operating the second hydraulic pump with a target rotation speed after the second hydraulic pump is operated with the predetermined maximum rotation speed.
  • a generated hydraulic pressure of the second hydraulic pump is increased to more than a target hydraulic pressure when the second hydraulic pump is operated with the predetermined maximum rotation speed.
  • Hydraulic pressure stored in the accumulator is used to shorten a time in which the generated hydraulic pressure is increased.
  • a hydraulic pressure producing system for an automatic transmission may include a first hydraulic pump adapted to generate a first hydraulic pressure for shifting, a second hydraulic pump adapted to additionally generate a second hydraulic pressure when the first hydraulic pressure generated by the first hydraulic pump is insufficient for shifting, a control unit controlling the second hydraulic pump, and an oil tank fluid-connected to the first and second hydraulic pumps and supplying oil to the first hydraulic pump and the second hydraulic pump, wherein the control unit predicts a finish point of an idle stop state and operates the second hydraulic pump prior to a predetermined time from the predicted finish point when the first hydraulic pump is operated in the idle stop state.
  • the first hydraulic pump is a mechanical hydraulic pump.
  • the second hydraulic pump is an electric hydraulic pump having a motor.
  • the control unit controls operation of the motor so as to control rotation speed of the second hydraulic pump.
  • a hydraulic pressure producing system for an automatic transmission may include a first hydraulic pump supplying a first hydraulic pressure for shifting to the transmission, a second hydraulic pump selectively supplying a second hydraulic pressure to the transmission, an accumulator fluid-connected to the first hydraulic pump and the second hydraulic pump and storing hydraulic pressure excessively generated by the first hydraulic pump and selectively transmitting the stored hydraulic pressure to the transmission, a control unit controlling operation of the second hydraulic pump, and an oil tank fluid-connected to the first hydraulic pump and the second hydraulic pump and supplying oil to the first and second hydraulic pumps, wherein the control unit determines a starting point for operating the second hydraulic pump, and wherein hydraulic pressure of the accumulator and the second hydraulic pressure of the second hydraulic pump are transmitted to the transmission when the second hydraulic pump is operated.
  • the second hydraulic pump is an electric hydraulic pump having a motor.
  • the control unit controls operation of the motor so as to control rotation speed of the second hydraulic pump.
  • the control unit predicts a finish point of an idle stop state and operates the second hydraulic pump prior to a predetermined time from the predicted finish point when the first hydraulic pump is operated in the idle stop state.
  • FIG. 1 is a schematic diagram of a hydraulic pressure producing system for an automatic transmission according to an exemplary embodiment of the present invention.
  • FIG. 2 is a graph illustrating the RPM of the second hydraulic pump and the generated hydraulic pressure according to an exemplary embodiment of the present invention.
  • FIG. 3 is a flowchart of a control method of a hydraulic pressure producing system for an automatic transmission according to an exemplary embodiment of the present invention.
  • FIG. 4 is a block diagram of members for predicting a finishing point of the idle stop according to an exemplary embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a hydraulic pressure producing system for an automatic transmission according to an exemplary embodiment of the present invention.
  • a hydraulic pressure producing system 10 for an automatic transmission 60 includes a first hydraulic pump 20 , a second hydraulic pump 30 , valves 70 , a motor 32 , a control unit 34 and an accumulator 40 .
  • the first hydraulic pump 20 generates hydraulic pressure for shifting.
  • the first hydraulic pump 20 pumps oil supplied from an oil tank 50 so as to transmit oil to the transmission 60 .
  • the one of the valves 70 is disposed between the first hydraulic pump 20 and the transmission 60 .
  • the first hydraulic pump 20 may be a mechanical hydraulic pump.
  • the second hydraulic pump 30 additionally generates hydraulic pressure when hydraulic pressure generated by the first hydraulic pump is insufficient.
  • the second hydraulic pump 30 pumps oil supplied from the oil tank 50 so as to transmit oil to the transmission 60 .
  • the other one of the valves 70 is disposed between the second hydraulic pump 30 and the transmission 60 .
  • the valves 70 are check valves for passing oil only toward the transmission 60 .
  • the second hydraulic pump 30 is not operated while a state of idle stop is maintained.
  • the idle stop state is a state in which a power of an engine is not transmitted to the automatic transmission 60 .
  • the second hydraulic pump 30 starts to operate prior to a predetermined time from a point that the idle stop state is finished.
  • the predetermined time is easily determined by a person of ordinary skill in the art.
  • the motor 32 is mounted at the second hydraulic pump 30 . That is, the second hydraulic pump 30 is an electric hydraulic pump to perform pumping by operation of the motor 32 .
  • the control unit 34 controls the pumping of the second hydraulic pump 30 .
  • the control unit 34 may be a motor control unit (MCU) that controls the operation of the motor 32 .
  • the motor 32 is controlled by the control unit 34 such that the RPM of the second hydraulic pump 30 is controlled.
  • MCU motor control unit
  • the accumulator 40 stores hydraulic pressure that is excessively generated by the first hydraulic pump 20 . Hydraulic pressure stored in the accumulator 40 is selectively supplied to the transmission 60 .
  • FIG. 2 is a graph illustrating the RPM of the second hydraulic pump and the generated hydraulic pressure according to an exemplary embodiment of the present invention.
  • FIG. 3 is a flowchart of a control method of a hydraulic pressure producing system for an automatic transmission according to an exemplary embodiment of the present invention.
  • FIG. 4 is a block diagram of members for predicting a finishing point of the idle stop according to an exemplary embodiment of the present invention.
  • an electronic control unit (ECU) 100 predicts a finish point of the idle stop state at step S 110 .
  • a signal is transmitted from a sensor 90 detecting operations of a brake 80 and a brake pedal 82 to the ECU 100 for predicting the finish point of the idle stop state.
  • the finish point of the idle stop state is predicted, operation of the second hydraulic pump 30 is started prior to a predetermined time from the predicted finish point at step S 120 .
  • the predetermined time is easily determined by a person of ordinary skill in the art.
  • the second hydraulic pump 30 is operated with a predetermined maximum RPM V 1 for a predetermined time at step S 130 .
  • a generated hydraulic pressure is increased to more than a target hydraulic pressure P in the step S 130 .
  • the target hydraulic pressure P is a value of hydraulic pressure demanded for shifting.
  • the generated hydraulic pressure of the step S 130 may be the sum of hydraulic pressure generated from the second hydraulic pump 30 and hydraulic pressure supplied from the accumulator 40 .
  • the hydraulic pressure stored in the accumulator 40 may be used in the step S 130 . Therefore, a time T from the finish point of the idle stop state to a point that the generated hydraulic pressure reaches the target hydraulic pressure P is decreased compared to a case of using only the second hydraulic pump 30 .
  • the predetermined maximum RPM V 1 is determined to be low compared to the case of using only the second hydraulic pump 30 .
  • the second hydraulic pump 30 is operated with a target RPM V 2 at step S 140 after the second hydraulic pump 30 is operated with the predetermined maximum RPM V 1 while the predetermined time passes. At this time, the second hydraulic pump 30 generates the target hydraulic pressure P.
  • a generated hydraulic pressure of the step S 140 is hydraulic pressure generated from the second hydraulic pump 30 . That is, hydraulic pressure stored in the accumulator 40 is not used.
  • the electric power is not unnecessarily consumed in the idle stop state.
  • fuel consumption can be improved since hydraulic pressure that is excessively generated by the first hydraulic pump 20 is recycled.
  • noise generated from a hydraulic pressure producing system 10 for an automatic transmission can be reduced.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
US13/711,131 2011-12-14 2012-12-11 Hydraulic pressure producing system for automatic transmission and control method thereof Abandoned US20130156604A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020110134872A KR101734272B1 (ko) 2011-12-14 2011-12-14 자동변속기의 유압생성장치 및 그 제어방법
KR10-2011-0134872 2011-12-14

Publications (1)

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US20130156604A1 true US20130156604A1 (en) 2013-06-20

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US13/711,131 Abandoned US20130156604A1 (en) 2011-12-14 2012-12-11 Hydraulic pressure producing system for automatic transmission and control method thereof

Country Status (5)

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US (1) US20130156604A1 (ja)
JP (1) JP6000707B2 (ja)
KR (1) KR101734272B1 (ja)
CN (1) CN103161946B (ja)
DE (1) DE102012110877A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015026657A1 (en) * 2013-08-20 2015-02-26 Borgwarner Inc. Engine oil accumulator
US20170120916A1 (en) * 2015-10-28 2017-05-04 Ford Global Technologies, Llc System and method for performing an engine stop and start for a rolling vehicle

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DE102015219528A1 (de) * 2015-10-08 2017-04-13 Zf Friedrichshafen Ag Saugkanalsystem für ein Getriebe
CN105465352B (zh) * 2015-12-31 2018-01-12 盛瑞传动股份有限公司 一种自动变速器系统的自动变速器自动启停控制方法
FR3053946B1 (fr) * 2016-07-12 2018-07-27 Peugeot Citroen Automobiles Sa Dispositif de controle de la pression hydraulique d'un accumulateur d'actionneur de boite de vitesses d'une chaine de transmission hybride de vehicule
US10316963B2 (en) * 2017-04-25 2019-06-11 GM Global Technology Operations LLC Pressure sensor rationality diagnostic for a dual clutch transmission
CN107939857A (zh) * 2017-12-22 2018-04-20 吉孚汽车技术(浙江)有限公司 用于自动变速器的启停泵
CN109084016B (zh) * 2018-10-08 2020-12-29 重庆长安汽车股份有限公司 一种dct变速器双泵系统、控制方法及汽车

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JP4207376B2 (ja) * 2000-10-06 2009-01-14 トヨタ自動車株式会社 車両の油圧制御装置
JP4330453B2 (ja) * 2002-04-10 2009-09-16 ルーク ラメレン ウント クツプルングスバウ ベタイリグングス コマンディートゲゼルシャフト 液圧システム及びオートマチックトランスミッション
JP3588091B2 (ja) * 2002-08-22 2004-11-10 本田技研工業株式会社 ハイブリッド車両の油圧制御装置
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015026657A1 (en) * 2013-08-20 2015-02-26 Borgwarner Inc. Engine oil accumulator
US20170120916A1 (en) * 2015-10-28 2017-05-04 Ford Global Technologies, Llc System and method for performing an engine stop and start for a rolling vehicle
US9834217B2 (en) * 2015-10-28 2017-12-05 Ford Global Technologies, Llc System and method for performing an engine stop and start for a rolling vehicle
US10336333B2 (en) 2015-10-28 2019-07-02 Ford Global Technologies, Llc System and method for performing an engine stop and start for a rolling vehicle
US10549758B2 (en) 2015-10-28 2020-02-04 Ford Global Technologies, Llc System and method for performing an engine stop and start for a rolling vehicle
RU2722204C2 (ru) * 2015-10-28 2020-05-28 Форд Глобал Текнолоджиз, Ллк Способ управления системой привода автомобиля

Also Published As

Publication number Publication date
KR101734272B1 (ko) 2017-05-12
CN103161946B (zh) 2016-10-26
KR20130067866A (ko) 2013-06-25
DE102012110877A1 (de) 2013-06-20
CN103161946A (zh) 2013-06-19
JP2013124770A (ja) 2013-06-24
JP6000707B2 (ja) 2016-10-05

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AS Assignment

Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, JONG HYUN;SONG, SANGLOK;KANG, SEUNGJAE;AND OTHERS;REEL/FRAME:029447/0460

Effective date: 20121009

Owner name: KIA MOTORS CORPORATION, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KIM, JONG HYUN;SONG, SANGLOK;KANG, SEUNGJAE;AND OTHERS;REEL/FRAME:029447/0460

Effective date: 20121009

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION