WO2023165273A1 - Dispositif d'injection de carburant et procédé d'étalonnage de paramètres pour dispositif d'injection de carburant - Google Patents

Dispositif d'injection de carburant et procédé d'étalonnage de paramètres pour dispositif d'injection de carburant Download PDF

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Publication number
WO2023165273A1
WO2023165273A1 PCT/CN2023/071531 CN2023071531W WO2023165273A1 WO 2023165273 A1 WO2023165273 A1 WO 2023165273A1 CN 2023071531 W CN2023071531 W CN 2023071531W WO 2023165273 A1 WO2023165273 A1 WO 2023165273A1
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Prior art keywords
fuel injection
fuel
injector
heat release
fuel injector
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PCT/CN2023/071531
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English (en)
Chinese (zh)
Inventor
庞斌
王德成
刘晓鑫
胡晓艳
李万里
陈荣祥
程旭
李志杰
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潍柴动力股份有限公司
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Publication of WO2023165273A1 publication Critical patent/WO2023165273A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus

Definitions

  • the present application relates to the field of technical diesel engines, for example, to a fuel injection device and a parameter calibration method of the fuel injection device.
  • a combustion chamber is arranged on the piston, and a fuel injector is vertically arranged on the cylinder head, and the nozzle of the fuel injector is located in the central area of the combustion chamber, thereby injecting fuel into the combustion chamber.
  • the gas is taken in through the intake port, forming a spiral vortex movement along the cylinder wall in the cylinder body of the cylinder, and the vortex ratio gradually decreases from the edge area of the cylinder block to the central area.
  • the injector starts to inject oil when the piston is close to the compression top dead center, and forms an entrainment effect at the end of the oil beam, and the oil beam mixes with the gas to form a combustible mixture.
  • the vortex in the central area of the combustion chamber is relatively small, and the oil jets from the injector are mainly distributed in the edge area of the combustion chamber, there is no fuel and gas mixing in the central area, and the air utilization rate is low.
  • the present application provides an oil injection device, which can improve the air utilization rate in the central area of the combustion chamber.
  • An embodiment provides a fuel injection device, comprising:
  • the first fuel injector which is obliquely arranged on the cylinder head, the first fuel injector includes a first fuel injector, the first fuel injector is located in the combustion chamber, along the circumferential direction of the first fuel injector A plurality of first fuel injection holes are provided;
  • the second fuel injector is obliquely arranged on the cylinder head, the second fuel injector includes a second fuel injector, the second fuel injector is located in the combustion chamber, and the second fuel injector
  • the second oil injection hole and the third oil injection hole are arranged on the top, and the second oil injection hole faces the central area of the combustion chamber, so that the oil jet sprayed by the second oil injection nozzle points to the combustion chamber
  • the central area of the center area, the third oil injection hole faces the annular protrusion in the combustion chamber, so that the oil jet sprayed by the second oil injection nozzle points to the annular protrusion in the combustion chamber.
  • the second oil injector is provided with a fourth oil injection hole, and the oil beam emitted by the fourth oil injection hole is tangent to the rotation direction of the vortex.
  • the angle between the axis of the first injector and the axis of the cylinder head is ⁇ 1 , wherein, 10° ⁇ 1 ⁇ 70°, the axis of the second injector and The included angle between the axes of the cylinder heads is ⁇ 2 , 10° ⁇ 2 ⁇ 70°.
  • the included angle between the axis of the second fuel injector and the oil beam sprayed from the third fuel injection hole to the annular protrusion is ⁇ 2 , 50° ⁇ 2 ⁇ 75°.
  • the present application also provides a parameter calibration method of the fuel injection device, which is set to calibrate the parameters of the above-mentioned fuel injection device, and the parameters include the start injection time and injection pressure of the first fuel injector, and the second fuel injection
  • the start injection time of the device includes the following steps:
  • the calibration range is 5°CA to 10°CA, and it is judged whether the value of the corresponding crankshaft angle is within the range of 5°CA to 10°CA when the rate of change of the heat release rate changes from positive to negative , when the corresponding value of the crank angle is within the range of 5°CA to 10°CA, the current parameter is used as the final parameter; when the corresponding value of the crank angle is less than 5°CA, the second injection Delay the start injection timing of the fuel injector, repeat S1-S4; when the corresponding value of the crankshaft angle is greater than 10°CA, advance the start injection timing of the first fuel injector or increase the first injection Injection pressure of the oiler, repeat S1-S4.
  • step S3 the heat release rate is output by the combustion analyzer, according to the formula Calculate the change rate of the heat release rate, wherein HR is the heat release rate, ⁇ is the crank angle, and ⁇ is the change rate of the heat release rate.
  • step S4 within one cycle, different values of the crank angle correspond to different values at different times, and the rate of change of the heat release rate corresponding to the different values of the crank angle is measured, according to the different values of the crank angle.
  • the value of the crankshaft angle and the rate of change of the heat release rate corresponding to the value of the different crank angle fit a plurality of discrete points into a curve, and draw the graph of the rate of change of the heat release rate based on the crank angle , look up the map to obtain the value of the crankshaft angle corresponding to when the rate of change of the heat release rate changes from positive to negative, and then make a judgment.
  • the injection start time of the first fuel injector is t 1
  • the injection start time of the second fuel injector is t 2
  • the t 1 is when the piston reaches the compression top dead center
  • the value of the crankshaft angle is at any time within the range of 15°CA to 5°CA
  • the t2 is after the piston reaches the compression top dead center
  • the value of the crankshaft angle is at 3°CA Any time within the range of ⁇ 5°CA.
  • the first fuel injector and the second fuel injector are arranged obliquely on the cylinder head, so that the first fuel injection hole of the first fuel injector can spray oil jets to the edge area of the combustion chamber, and the second fuel injector
  • the second fuel injection hole of the injector can inject oil beam to the central area of the combustion chamber
  • the third oil injection hole of the second injector can inject oil beam to the annular protrusion of the combustion chamber
  • the first injector and the second injector The two injectors cooperate with each other, thereby enhancing the strength of the flow field in the combustion chamber, promoting the uniformity of the mixed gas in the combustion chamber, and reducing the generation of smoke.
  • the second fuel injection hole of the second fuel injector makes full use of the turbulence of the fuel jet when injecting fuel, and the high-speed jet continuously entrains nearby air during the process of advancing and expanding, forming an entrainment effect around the fuel jet , when the fuel is injected into the central area of the combustion chamber, the air in the central area of the cylinder body of the cylinder is involved in the jet oil beam, thereby increasing the flow field strength in the central area of the cylinder through the action of the oil beam jet, and promoting the mixing of oil and gas.
  • the second fuel injector provided by the present application, the second fuel injection hole injects fuel to the central area of the combustion chamber, and the third fuel injection hole injects fuel to the central area of the combustion chamber.
  • the annular protrusion of the combustion chamber jets and burns, and under the action of the entrainment effect of the oil beam, it quickly mixes with the air in the cylinder to form a combustible mixture, making full use of the air in the cylinder.
  • the parameter calibration method of the fuel injection device provided by this application calculates the change rate of the heat release rate according to the heat release rate, and then judges according to the change rate of the heat release rate. When the value changes from a positive value to a negative value, the crank angle is within the calibration range . If the corresponding crank angle is within the calibrated range, it proves that the combustion rate in the combustion chamber during the deceleration period is normal. If the corresponding crank angle is not within the calibrated range, adjust it according to the actual situation.
  • the parameter calibration method of the fuel injection device provided by the present application improves the combustion speed in the deceleration period in the combustion process of the combustion chamber, improves the heat utilization rate, and improves the power performance of the diesel engine.
  • Fig. 1 is a cross-sectional view of a fuel injection device provided in an embodiment of the present application provided on a cylinder head;
  • Fig. 2 is a graph of the fuel injection law of the parameter calibration method of the fuel injection device provided by the embodiment of the present application;
  • Fig. 3 is a graph of the change rate of the heat release rate with the crank angle of the parameter calibration method of the fuel injection device provided by the embodiment of the present application;
  • Fig. 4 is a flow chart of a parameter calibration method of a fuel injection device provided by an embodiment of the present application.
  • the first fuel injector 11. The first fuel injector;
  • the second fuel injector 21. The second fuel injector.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Integrate; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components.
  • connection can be a fixed connection or a detachable connection, or Integrate; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components.
  • the first feature being “on” or “below” the second feature may include direct contact between the first and second features, and may also include the first and second features being in direct contact with each other. Two features are not in direct contact but through another feature between them.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • "Below”, “beneath” and “beneath” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the level of the first feature is smaller than that of the second feature.
  • the orientation or positional relationship of the terms “upper”, “lower”, and “right” are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating Or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the application.
  • the terms “first” and “second” are only used to distinguish in description, and have no special meaning.
  • This embodiment provides a fuel injection device, as shown in Figure 1, it includes a first fuel injector 1 and a second fuel injector 2, both of the first fuel injector 1 and the second fuel injector 2 are obliquely arranged on On the cylinder head 100, the first fuel injector 1 includes a first fuel injector 11, the first fuel injector 11 is located in the combustion chamber 200, and a plurality of first fuel injection holes are arranged along the circumferential direction of the first fuel injector 11 , so as to inject oil beams to the edge area of the combustion chamber 200; the second fuel injector 2 includes a second fuel injection nozzle 21, the second fuel injection nozzle 21 is located in the combustion chamber 200, and the second fuel injection nozzle 21 is provided with a first Two fuel injection holes and the third fuel injection hole, the second fuel injection hole is towards the central area of the combustion chamber 200, so that the oil beam emitted by the second fuel injection nozzle 21 is directed to the central area of the combustion chamber 200, the third oil injection hole
  • the annular protrusion 201 faces the combustion chamber 200
  • annular protrusion 201 is provided in the combustion chamber 200 along the circumference of its inner wall.
  • the annular protrusion 201 divides the combustion chamber 200 into an upper layer pit 202 and a lower layer pit 203.
  • the third oil injection hole can spray oil jets towards the piston throat position.
  • the first fuel injector 1 and the second fuel injector 2 are arranged obliquely on the cylinder head 100, so that the first fuel injection hole of the first fuel injector 1 can reach the edge area of the combustion chamber 200 Injecting oil jets, the second oil injection hole of the second fuel injector 2 can inject oil jets to the central area of the combustion chamber 200, and the third oil injection hole of the second oil injector 2 can inject the annular protrusion 201 of the combustion chamber 200 Injecting the oil beam, the first fuel injector 1 and the second fuel injector 2 cooperate with each other, thereby enhancing the strength of the flow field in the combustion chamber 200, promoting the uniformity of the mixture in the combustion chamber 200, and reducing the generation of smoke.
  • the second fuel injection hole of the second fuel injector 2 makes full use of the turbulence of the oil beam when injecting fuel, and the high-speed jet continuously entrains nearby air during the process of advancing and expanding, forming an entrainment around the oil beam. effect, when the fuel is injected into the central area of the combustion chamber 200, the air in the central area of the cylinder body of the cylinder is involved in the jet oil jet, thereby increasing the flow field strength in the central area of the cylinder through the action of the oil jet, and promoting the oil-gas mix.
  • the fuel injection device Compared with the related art that utilizes a fuel injector structure vertically arranged on the cylinder head 100, the fuel injection device provided in this embodiment, the second fuel injector 2 not only injects fuel to the central area of the combustion chamber 200, but also injects fuel to the combustion chamber 200.
  • the annular protrusion 201 of the chamber 200 injects fuel, and under the action of the entrainment effect of the oil beam, it quickly mixes with the air in the cylinder to form a combustible mixture, making full use of the air in the cylinder.
  • the installation position of the first fuel injection nozzle 11 of the first fuel injector 1 is located on the axis of the cylinder head 100
  • the installation position of the second fuel injection nozzle 21 of the second fuel injector 2 is
  • the distance from the axis of the cylinder head 100 is L
  • the angle between the axis of the first injector 1 and the axis of the cylinder head 100 is ⁇ 1 , where 10° ⁇ 1 ⁇ 70°, in this embodiment , ⁇ 1 is 32°
  • the angle between the axis of the second injector 2 and the axis of the cylinder head 100 is ⁇ 2
  • 10° ⁇ 2 ⁇ 70° in this embodiment, ⁇ 2 is 42° .
  • angles of ⁇ 1 and ⁇ 2 are set according to actual needs, for example, ⁇ 1 can be 10°, 20°, 30°, 40°, 50°, 60° or 70°, and ⁇ 2 can be 10°, 20°, 30°, 40°, 50°, 60° or 70°. It should be noted that the angles of ⁇ 1 and ⁇ 2 may or may not be equal.
  • the axis of the cylinder head 100 , the axis of the first fuel injector 1 and the axis of the second fuel injector 2 are on the same plane.
  • the first fuel injection hole of the first fuel injector 1 can inject fuel toward the annular protrusion 201 of the combustion chamber 200, and the oil beam sprayed from the first fuel injection hole is consistent with the first fuel injection
  • the included angles between the axes of the device 1 are ⁇ 1 and ⁇ 2 respectively.
  • ⁇ 1 is 52° and ⁇ 2 is 111°.
  • the second fuel injection hole of the second fuel injector 2 injects fuel toward the central area of the combustion chamber 200, and the angle between the oil jet sprayed from the second fuel injection hole and the axis of the second fuel injector 2 is ⁇ 1 .
  • ⁇ 1 is 41°
  • the angle between the axis of the second injector 2 and the oil jet from the third injection hole to the annular protrusion 201 is ⁇ 2 , 50° ⁇ 2 ⁇ 75°
  • ⁇ 2 is 111°.
  • the number of the second fuel injection hole and the third fuel injection hole, and the diameter D 1 of the second fuel injection hole and the diameter D 2 of the third fuel injection hole are set according to actual needs.
  • a fourth fuel injection hole may be provided on the second fuel injector 2, and the gas is fed into the intake port to form a spiral vortex motion along the cylinder wall in the cylinder body.
  • the fourth fuel injection hole The injected oil beam is tangent to the rotation direction of the vortex, which further enhances the vortex ratio in the central area of the combustion chamber 200 and promotes the mixing of oil and gas in the cylinder.
  • This embodiment also provides a method for calibrating the parameters of the fuel injection device, which is used to calibrate the parameters of the above-mentioned fuel injection device.
  • the parameters of the fuel injection device include the first fuel injector 1
  • the start injection time of the second fuel injector 2 the parameter calibration method of the fuel injection device includes the following steps:
  • ⁇ is the change rate of heat release rate. When ⁇ >0, it is considered that the heat release rate is in the process of increasing, and when ⁇ 0, it is considered that the heat release rate begins to decrease.
  • the parameter calibration method of the fuel injection device provided in this embodiment calculates the heat release rate change rate ⁇ according to the heat release rate, and then judges according to the heat release rate change rate ⁇ .
  • ⁇ changes from a positive value to a negative value
  • the crankshaft angle within the calibrated range. If the corresponding crank angle is within the calibrated range, it proves that the combustion rate of the combustion chamber 200 during the deceleration period is normal. If the corresponding crank angle is not within the calibrated range, adjust it according to the actual situation.
  • the method for calibrating the parameters of the fuel injection device provided in this embodiment improves the combustion speed of the combustion chamber 200 during the deceleration period, improves the heat utilization rate, and enhances the power performance of the diesel engine.
  • step S0 is also included.
  • the combustion analyzer is used to collect the cylinder pressure curve of the engine per cycle, and implement the cylinder pressure calibration and combustion heat release process.
  • a combustion analyzer is connected to the test bench, and the heat release rate is output through the combustion analyzer.
  • step S1 the injection start time of the first fuel injector 1 is t 1
  • the injection start time of the second fuel injector 2 is t 2
  • t 1 is before the piston 300 runs to the compression top dead center
  • t2 is any time when the value of the crankshaft angle is within the range of 3°CA to 5°CA after the piston 300 runs to the compression top dead center .
  • the injection duration period of the first injector 1 is T 1
  • the injection duration period of the second injector 2 is T 2
  • the time period T 1 and the time T 2 Sections overlap partially, that is, when the first injector 1 is injecting fuel, the second injector 2 starts to inject, thereby increasing the combustion speed in the deceleration period during the combustion process.
  • the dotted line box in Fig. 2 indicates that only The injection law when there is one fuel injector, the solid line box represents the injection law that uses the first fuel injector 1 and the second fuel injector 2 to act together in this embodiment.
  • the time period T1 and the time period T2 may not overlap, and the second fuel injector 2 starts to inject after the first fuel injector 1 completes the fuel injection.
  • step S3 the heat release rate is output by the combustion analyzer, according to the formula Carry out the first-order derivation to calculate the heat release rate change rate, where HR is the heat release rate, ⁇ is the crank angle, and ⁇ is the heat release rate change rate.
  • step S4 within a cycle, different values of crankshaft angles correspond to different values at different times, and the rate of change of heat release rate corresponding to different values of crankshaft angles is measured, according to the values of different crankshaft angles and the values of different crankshaft angles For the corresponding heat release rate change rate, fit multiple discrete points into a curve, draw the heat release rate change rate curve based on the crankshaft angle, and check the graph to obtain the corresponding crankshaft angle when the heat release rate change rate changes from positive to negative value, and then make a judgment.
  • crankshaft angle ⁇ as the X axis
  • heat release rate change rate ⁇ as the Y axis to draw a graph of the heat release rate change rate ⁇ based on the crankshaft angle ⁇ . It can be seen from the figure that ⁇ changes from a positive value When it changes to a negative value, the specific numerical value of the corresponding crankshaft angle ⁇ , so that subsequent judgments can be made according to the corresponding crankshaft angle ⁇ .
  • the calibration range is 5°CA to 10°CA.
  • the post-combustion period refers to the period from t3 to t4 .
  • the change value of the crankshaft angle is greater than 15°CA, that is, the crankshaft corresponding to t4
  • the difference between the value of the rotation angle ⁇ and the value of the crank angle ⁇ corresponding to t3 is greater than 15°CA, the injection pressure of the second injector 2 can be increased, the time of this stage can be shortened as much as possible, the heat release process can be accelerated, and the combustion can be improved
  • the reaction rate of the post-combustion period of the chamber 200 when the change value of the crankshaft angle is greater than 15°CA, that is, the crankshaft corresponding to t4
  • the injection pressure of the second injector 2 can be increased, the time of this stage can be shortened as much as possible, the heat release process can be accelerated, and the combustion can be improved
  • the reaction rate of the post-combustion period of the chamber 200 is the change value of the crankshaft angle is greater than 15°CA

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

L'invention concerne un dispositif d'injection de carburant et un procédé d'étalonnage de paramètres destiné au dispositif d'injection de carburant. Le dispositif d'injection de carburant comprend un premier injecteur de carburant (1) et un second injecteur de carburant (2), le premier injecteur de carburant (1) et le second injecteur de carburant (2) étant tous deux disposés obliquement sur une culasse (100) ; le premier injecteur de carburant (1) comprend une première buse de carburant (11) ; la première buse de carburant (11) est située dans une chambre de combustion (200) ; une pluralité de premiers trous d'injection de carburant est formée dans la direction circonférentielle de la première buse de carburant (11), de façon à faciliter l'injection de faisceaux de carburant dans la zone de bord de la chambre de combustion (200) ; le second injecteur de carburant (2) comprend une seconde buse de carburant (21) ; la seconde buse de carburant (21) est située dans la chambre de combustion (200) ; des deuxièmes trous d'injection de carburant et des troisièmes trous d'injection de carburant sont formés sur la seconde buse de carburant (21) ; les deuxièmes trous d'injection de carburant font face à la zone centrale de la chambre de combustion (200), de sorte que les faisceaux de carburant pulvérisés depuis la seconde buse de carburant (21) soient dirigés vers la zone centrale de la chambre de combustion (200) ; et les troisièmes trous d'injection de carburant font face à des saillies annulaires (201) dans la chambre de combustion (200), de sorte que les faisceaux de carburant pulvérisés depuis la seconde buse de carburant (21) soient dirigés vers les saillies annulaires de la chambre de combustion (200).
PCT/CN2023/071531 2022-03-01 2023-01-10 Dispositif d'injection de carburant et procédé d'étalonnage de paramètres pour dispositif d'injection de carburant WO2023165273A1 (fr)

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CN202210189148.9 2022-03-01
CN202210189148.9A CN114251210B (zh) 2022-03-01 2022-03-01 一种喷油装置的参数标定方法

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CN114251210B (zh) * 2022-03-01 2022-06-24 潍柴动力股份有限公司 一种喷油装置的参数标定方法

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CN102235257A (zh) * 2010-05-07 2011-11-09 通用汽车环球科技运作有限责任公司 多次喷射正时控制的方法
CN112879149A (zh) * 2021-01-25 2021-06-01 华中科技大学 一种适用于高功率密度柴油机的非对称燃烧室系统
CN112879146A (zh) * 2021-01-25 2021-06-01 华中科技大学 一种适用于高功率密度柴油机的主副喷油器系统
CN114233544A (zh) * 2022-02-25 2022-03-25 潍柴动力股份有限公司 一种发动机双主喷装置及发动机冷启动过程的标定方法
CN114251210A (zh) * 2022-03-01 2022-03-29 潍柴动力股份有限公司 一种喷油装置及喷油装置的参数标定方法

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