US20170342891A1 - Apparatus and method for controlling piston cooling oil jet - Google Patents

Apparatus and method for controlling piston cooling oil jet Download PDF

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Publication number
US20170342891A1
US20170342891A1 US15/377,567 US201615377567A US2017342891A1 US 20170342891 A1 US20170342891 A1 US 20170342891A1 US 201615377567 A US201615377567 A US 201615377567A US 2017342891 A1 US2017342891 A1 US 2017342891A1
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Prior art keywords
oil
rpm
factor value
oil pressure
pressure
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Abandoned
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US15/377,567
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English (en)
Inventor
Chang Hoon HA
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Hyundai Motor Co
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Hyundai Motor Co
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Assigned to HYUNDAI MOTOR COMPANY reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HA, CHANG HOON
Publication of US20170342891A1 publication Critical patent/US20170342891A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/08—Lubricating systems characterised by the provision therein of lubricant jetting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/06—Arrangements for cooling pistons
    • F01P3/08—Cooling of piston exterior only, e.g. by jets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P2003/006—Liquid cooling the liquid being oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2023/00—Signal processing; Details thereof
    • F01P2023/08—Microprocessor; Microcomputer

Definitions

  • the present invention relates to an apparatus and method for controlling a piston cooling oil jet. More particularly, it relates to an apparatus and method for controlling a piston cooling oil jet, capable of improving performance of a piston and fuel efficiency.
  • an internal combustion engine compresses and explodes fuel and air introduced into a combustion chamber so that pistons reciprocate up and down, and converts the reciprocation of the pistons into rotational motion using a crank mechanism so as to obtain rotary power.
  • the internal combustion engine may often rotate at a high speed due to the occurrence of friction between components and a large load applied thereto during operation.
  • the force applied to such a friction portion may be lost due to resistance, together with the force generated in the expansion stroke of the cylinder added thereto.
  • the friction between components causes the quick wear and short life of the associated components. This causes the performance of the internal combustion engine to deteriorate.
  • a piston used in an internal combustion engine is mainly made of an aluminum alloy having light weight and high heat transmissibility.
  • an aluminum alloy has a disadvantage in that tensile strength and hardness are reduced at high temperature.
  • the head portion of the piston is subjected to high heat as a mixture is combusted in an upper combustion chamber, which may lead to problems relating to a reduction in strength, a heat strain, aluminum adhesion, excess abrasion of rings, etc.
  • the higher the temperature of the piston the faster the degradation of oil, which may cause a carbon deposit to be excessively formed.
  • the power of the engine may be adjusted or the passage of coolant may be changed such that the temperature of the piston is maintained below a certain level, but the effect thereof is not great.
  • the related art adopts a method of cooling a piston by spraying oil from the lower portion of the piston using an oil jet in order to effectively reduce the temperature of the piston. That is, when an oil pump pumps oil and transfers it to a main gallery, the oil jet sprays the oil to the oil jet gallery of the piston, thereby cooling the head portion of the piston.
  • Various aspects of the present invention are directed to providing an apparatus and method for controlling a piston cooling oil jet, capable of improving performance of a piston and fuel efficiency by determining a target oil pressure through a power compensation map, a target oil pressure curve, and a temperature compensation map, which are set using an RPM, an engine load, and an oil temperature, and by comparing and controlling the determined target oil pressure and a current oil pressure to determine an opening degree of an oil jet valve for cooling the piston.
  • an apparatus for controlling a piston cooling oil jet includes a main gallery supplied with oil, an oil jet gallery defining an oil injection path such that the oil passing through the main gallery is introduced thereinto and is sprayed to a lower portion of a piston, an oil jet valve opening the oil injection path such that the oil supplied to the main gallery is introduced into the oil jet gallery, and a controller electrically connected to the oil jet valve, the controller determining a target oil pressure through a first factor value corresponding to an RPM and an engine load, a second factor value determined by a predetermined target oil pressure curve, and a third factor value corresponding to an RPM and an oil temperature in the main gallery, to control an opening degree of the oil jet valve using the target oil pressure.
  • the controller may include a power compensation map setting device allowing the first factor value to be set, a target oil pressure curve setting device allowing the second factor value to be set, a temperature compensation map setting device allowing the third factor value to be set, and a determination device configured to determine the target oil pressure by adding a first pressure value, which is obtained by multiplying the first and second factor values in the same condition of RPM, to a second pressure value, which is obtained by a difference between the second and third factor values.
  • the power compensation map setting device may allow the first factor value to be set from an RPM detected by an RPM detection device and an engine load in the RPM.
  • the target oil pressure curve setting device may allow the second factor value corresponding to an RPM detected by an RPM detection device to be set from the predetermined target oil pressure curve.
  • the temperature compensation map setting device may allow the third factor value to be set from an RPM detected by an RPM detection device and an oil temperature in the main gallery measured in the RPM.
  • the oil jet valve may be an electronic solenoid proportional control valve.
  • the controller may compare the target oil pressure with a current oil pressure in the main gallery and an oil pressure in the oil jet gallery through Proportional Integral (PI) control, and control the opening degree of the oil jet valve.
  • PI Proportional Integral
  • a method of controlling a piston cooling oil jet includes setting a first factor value, a second factor value, and a third factor value using an RPM, an engine load, and an oil temperature in a main gallery, and determining a first pressure value by multiplying the first and second factor values in the same condition of RPM, determining a second pressure value by a difference between the second and third factor values in the same condition of RPM, and determining a target oil pressure by adding the first pressure value to the second pressure value.
  • the method may further include controlling an opening degree of an oil jet valve by comparing the target oil pressure with a current oil pressure in the main gallery and an oil pressure in an oil jet gallery.
  • the first factor value may be set from an RPM detected by an RPM detection device and an engine load in the RPM.
  • the second factor value corresponding to an RPM detected by an RPM detection device may be set from a predetermined target oil pressure curve.
  • the third factor value may be set from an RPM detected by an RPM detection device and an oil temperature in the main gallery measured in the RPM.
  • vehicle or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum).
  • a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.
  • FIG. 1 is a view schematically illustrating an apparatus for controlling a piston cooling oil jet according to an exemplary embodiment of the present invention
  • FIG. 2 is a view illustrating a controller of the apparatus for controlling a piston cooling oil jet according to the exemplary embodiment of the present invention
  • FIG. 3 is a graph illustrating a target oil pressure curve for the apparatus for controlling a piston cooling oil jet according to the exemplary embodiment of the present invention
  • FIG. 4 is a flowchart illustrating a method of controlling a piston cooling oil jet according to another exemplary embodiment of the present invention
  • FIG. 5 is a block diagram illustrating a control logic of the method of controlling a piston cooling oil jet according to the exemplary embodiment of the present invention.
  • FIG. 6 is an exemplary table for determination of a target oil pressure in the method of controlling a piston cooling oil jet according to the exemplary embodiment of the present invention.
  • FIG. 1 is a view schematically illustrating an apparatus for controlling a piston cooling oil jet according to an exemplary embodiment of the present invention.
  • FIG. 2 is a view illustrating a controller of the apparatus for controlling a piston cooling oil jet according to the exemplary embodiment of the present invention.
  • FIG. 3 is a graph illustrating a target oil pressure curve for the apparatus for controlling a piston cooling oil jet according to the exemplary embodiment of the present invention.
  • the apparatus for controlling a piston cooling oil jet includes a main gallery 100 , an oil jet gallery 200 , an oil jet valve 300 , and a controller 400 .
  • the main gallery 100 is mounted in a cylinder block of a piston so that oil is supplied along an inside passage of the main gallery by the driving of an oil pump.
  • the oil jet gallery 200 defines an oil injection path such that the oil passing through the main gallery 100 is introduced thereinto and is sprayed to the lower portion of the piston.
  • the oil jet valve 300 opens the oil injection path such that the oil supplied to the main gallery 100 is introduced into the oil jet gallery 200 as the pressure of the oil is increased.
  • the oil jet valve 300 is an electronic solenoid proportional control valve, and is electrically connected to the controller 400 .
  • the opening degree of the oil jet valve 300 may be adjusted by the control of the controller 400 .
  • a conventional oil jet valve is a mechanical control valve, the opening degree of which may not be independently adjusted and controlled by the control of a controller. For this reason, the same amount of oil is always supplied to a piston, regardless of conditions including an RPM, an engine load, and an oil temperature.
  • the controller 400 may determine a flow rate required for a piston, using an RPM, an engine load in the RPM, and an engine temperature, and thus may effectively control the opening degree of the oil jet valve 300 . As a result, it is possible to resolve the above problems.
  • the controller 400 determines a target oil pressure in the oil jet gallery 200 , through a first factor value corresponding to an RPM and an engine load, a second factor value determined by a predetermined target oil pressure curve, and a third factor value corresponding to an RPM and an oil temperature in the main gallery 100 , and controls the opening degree of the oil jet valve 300 using the determined target oil pressure.
  • the controller 400 which is electrically connected to the oil jet valve 300 , includes a power compensation map setting device 410 , a target oil pressure curve setting device 420 , a temperature compensation map setting device 430 , and a determination device 440 , as illustrated in FIG. 2 .
  • the power compensation map setting device 410 allows the first factor value to be set from an RPM detected by an RPM detection device and an engine load detected in the RPM.
  • the target oil pressure curve setting device 420 is preset, and allows the second factor value corresponding to an RPM detected by the RPM detection device to be set from a predetermined target oil pressure curve, as illustrated in FIG. 3 .
  • the temperature compensation map setting device 430 allows the third factor value to be set from an RPM detected by the RPM detection device and an oil temperature in the main gallery 100 measured in the RPM.
  • the determination device 440 determines the first, second, and third factor values in the same condition of RPM, and determines a target oil pressure by adding a first pressure value, which is obtained by multiplying the first and second factor values, to a second pressure value, which is obtained by a difference between the second and third factor values.
  • the controller 400 compares and controls a current oil pressure in the main gallery 100 and an oil pressure in the oil jet gallery 200 through Proportional Integral (PI) control using the target oil pressure, and thus determines a flow rate required for a piston to control the oil jet valve 300 . As a result, it is possible to effectively control the opening degree of the oil jet valve 300 .
  • PI Proportional Integral
  • the apparatus for controlling a piston cooling oil jet can control the oil jet valve 300 by determining the target oil pressure through the power compensation map, the target oil pressure curve, and the temperature compensation map, which are set using the RPM, the engine load, and the oil temperature in the main gallery 100 , adjusting the opening degree of the oil jet valve 300 depending on the high-load region and low-load region of the engine. Therefore, it is possible to improve the performance of the piston and fuel efficiency and to simultaneously reduce the capacity of the oil pump for transferring oil to the main gallery 100 .
  • FIG. 4 is a flowchart illustrating a method of controlling a piston cooling oil jet according to another exemplary embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating a control logic of the method of controlling a piston cooling oil jet according to the exemplary embodiment of the present invention.
  • FIG. 6 is an exemplary table for determination of a target oil pressure in the method of controlling a piston cooling oil jet according to the exemplary embodiment of the present invention.
  • a first factor value, a second factor value, and a third factor value are set using an RPM, an engine load, and an oil temperature in a main gallery (S 100 ).
  • the first factor value is set from an RPM detected by an RPM detection device and an engine load in the RPM.
  • the set first factor value is stored as in the table of a power compensation map illustrated in FIG. 6 .
  • the second factor value is set to be a value corresponding to an RPM detected by the RPM detection device from a predetermined target oil pressure curve illustrated in FIG. 3 .
  • the set second factor value is stored as in the table of a target oil pressure curve illustrated in FIG. 6 .
  • the third factor value is set from an RPM detected by the RPM detection device and an oil temperature in the main gallery measured in the RPM.
  • the set third factor value is stored as in the table of a temperature compensation map illustrated in FIG. 6 .
  • a first pressure value is obtained by multiplying the first and second factor values in the same condition of RPM
  • a second pressure value is obtained by a difference between the second and third factor values in the same condition of RPM
  • a target oil pressure is determined by adding the first pressure value to the second pressure value (S 200 ).
  • an opening degree of an oil jet valve is controlled by comparing the target oil pressure with a current oil pressure in the main gallery and an oil pressure in an oil jet gallery (S 300 ).
  • a target oil pressure by comparing a first operation condition, in which the RPM is 1800 rpm, the temperature in the main gallery is 60° C., and the engine load is 10%, with a second operation condition, in which the RPM is 1800 rpm equal to that in the first operation condition, the temperature in the main gallery is 100° C., and the engine load is 80%, will be described with reference to FIG. 6 .
  • the first factor value is 0.10 through the power compensation map and the second factor value is 155 through the target oil pressure curve in the first operation condition.
  • the first factor value is 0.92 through the power compensation map and the second factor value is 155 through the target oil pressure curve in the second operation condition.
  • the performance of the piston and fuel efficiency may be improved since the target oil pressure is determined differently depending on the first and second operation conditions and thus the opening degree of the oil jet valve is controlled depending on the conditions.
  • the flow rate required in a first load condition in which the RPM is 1800 rpm and the engine load 100%
  • the flow rate required in a second load condition in which the engine load is 10% in the same RPM
  • the flow rate which is set by the oil jet in the RPM of 1800 rpm
  • the surplus flow rate in the first load condition is 2.1 L/min
  • the surplus flow rate in the second load condition is 6.8 L/min.
  • the present invention has an effect of improving the performance of the piston and fuel efficiency by determining the target oil pressure through the power compensation map, the target oil pressure curve, and the temperature compensation map, which are set using an RPM, an engine load, and an oil temperature, and by comparing and controlling the determined target oil pressure and the current oil pressure to determine the opening degree of the oil jet valve for cooling the piston.
  • the present invention has an effect of reducing the capacity of the oil pump, which pumps and transfers oil to the main gallery, since the opening degree of the oil jet valve can be selectively varied to correspond to the RPM, the engine load, and the oil temperature by comparing and controlling the target oil pressure and the current oil pressure.
  • the present invention has an effect of improving performance of a piston and fuel efficiency by determining a target oil pressure through a power compensation map, a target oil pressure curve, and a temperature compensation map, which are set using an RPM, an engine load, and an oil temperature, and by comparing and controlling the determined target oil pressure and a current oil pressure to determine an opening degree of an oil jet valve for cooling the piston.
  • the present invention has an effect of reducing the capacity of an oil pump, which pumps and transfers oil to a main gallery, since the opening degree of the oil jet valve can be selectively varied to correspond to the RPM, the engine load, and the oil temperature by comparing and controlling the target oil pressure and the current oil pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
US15/377,567 2016-05-24 2016-12-13 Apparatus and method for controlling piston cooling oil jet Abandoned US20170342891A1 (en)

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KR1020160063186A KR101734771B1 (ko) 2016-05-24 2016-05-24 피스톤 냉각 오일젯 제어 장치 및 방법
KR10-2016-0063186 2016-05-24

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN109931144A (zh) * 2017-12-19 2019-06-25 现代自动车株式会社 油压开关，活塞冷却油喷嘴的诊断装置及其控制方法
JP2021055562A (ja) * 2019-09-27 2021-04-08 いすゞ自動車株式会社 内燃機関の制御装置及び、制御方法
US11105252B2 (en) * 2019-10-15 2021-08-31 Hyundai Motor Company Cooling apparatus of piston and control method thereof
US11199115B2 (en) 2018-08-30 2021-12-14 Volvo Truck Corporation Oil system and method of controlling oil system
USD965029S1 (en) * 2020-09-11 2022-09-27 Transportation Ip Holdings, Llc Piston cooling jet
WO2023158512A1 (en) * 2022-02-18 2023-08-24 Caterpillar Inc. Optimized piston temperature control in gaseous fuel hydrogen engine system

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CN109838298B (zh) * 2019-03-11 2021-02-23 潍柴动力股份有限公司 一种商用车活塞冷却喷嘴控制方法及控制系统
KR20220159159A (ko) 2021-05-25 2022-12-02 현대자동차주식회사 엔진의 피스톤 쿨링 장치 및 그 제어 방법
CN116378810B (zh) * 2023-03-16 2024-03-26 中国空气动力研究与发展中心空天技术研究所 一种用于活塞发动机的冷却装置

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CN109931144A (zh) * 2017-12-19 2019-06-25 现代自动车株式会社 油压开关，活塞冷却油喷嘴的诊断装置及其控制方法
US11467062B2 (en) 2017-12-19 2022-10-11 Hyundai Motor Company Oil pressure switch, apparatus for diagnosing piston cooling oil jet, and method of controlling the same
US11199115B2 (en) 2018-08-30 2021-12-14 Volvo Truck Corporation Oil system and method of controlling oil system
JP2021055562A (ja) * 2019-09-27 2021-04-08 いすゞ自動車株式会社 内燃機関の制御装置及び、制御方法
US11105252B2 (en) * 2019-10-15 2021-08-31 Hyundai Motor Company Cooling apparatus of piston and control method thereof
USD965029S1 (en) * 2020-09-11 2022-09-27 Transportation Ip Holdings, Llc Piston cooling jet
WO2023158512A1 (en) * 2022-02-18 2023-08-24 Caterpillar Inc. Optimized piston temperature control in gaseous fuel hydrogen engine system
US20230265777A1 (en) * 2022-02-18 2023-08-24 Caterpillar Inc. Optimized piston temperature control in gaseous fuel hydrogen engine system
US11939904B2 (en) * 2022-02-18 2024-03-26 Caterpillar Inc. Optimized piston temperature control in gaseous fuel hydrogen engine system

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CN107420178A (zh) 2017-12-01
KR101734771B1 (ko) 2017-05-11

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