A method and device for adjusting a variable fuel injector

Abstract

The present invention provides a method and device for adjusting a variable fuel injector, which is applied to an ECU, and the method includes: obtaining the working condition of the current engine during operation; determining a first angle and a second angle from the cone angle selection test results corresponding to the engine development information based on the working condition; adjusting the cone angle of the spray hole of the variable fuel injector based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector. The present invention shows a variable fuel injector that can rotate the spray hole, and determines the optimal cone angle of the spray hole in the variable fuel injector under different working conditions according to different working conditions, so that the cone angle is matched to the best, so as to flexibly adjust the oil volume distribution, thereby optimizing the engine performance.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel injectors, and in particular to a method and a device for adjusting a variable fuel injector. Background Art

[0002] When the combustion chamber is constant, the oil distribution in the cylinder is mainly adjusted by the injector cone angle and injection timing.

[0003] During the injection process, the injection parameters and flow conditions in the cylinder are different for different working conditions. As the speed and load differences increase, this unevenness will further increase. However, the single-row spray holes have a fixed cone angle, which makes the geometric relationship between the spray holes and the piston fixed. Therefore, the oil distribution cannot be flexibly adjusted. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a method and device for adjusting a variable fuel injector to solve the existing problem that the cone angle of the spray hole is fixed and the oil quantity distribution cannot be flexibly adjusted.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A first aspect of an embodiment of the present invention shows a method for adjusting a variable injector, which is applied to an ECU. The method includes:

[0007] Get the current operating condition of the engine;

[0008] Determining a first angle and a second angle from a cone angle selection test result corresponding to the engine development information based on the operating condition;

[0009] The cone angle of the spray hole of the variable fuel injector is adjusted based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector.

[0010] Optionally, the first angle and the second angle are determined from cone angle selection test results corresponding to the engine development information based on the operating condition;

[0011] determining a type of the engine based on development information of the engine;

[0012] The first angle and the second angle corresponding to the working condition are determined from the cone angle selection test results corresponding to the type of the engine, and the cone angle selection test results are obtained by pre-processing.

[0013] Optionally, the process of pre-processing the cone angle selection test results includes:

[0014] For different types of engines, determining whether the basic parameters of the engine meet preset requirements;

[0015] If satisfied, obtaining the maximum torque and maximum speed of the engine according to different working conditions;

[0016] Determining a first angle of the variable injector under each operating condition based on a maximum torque value and a maximum speed value of the engine;

[0017] For each type of engine, based on the emission requirements of the engine, determining a second angle of the variable injector under each operating condition;

[0018] The type corresponding to the engine, the corresponding relationship between the first angle of the variable injector under each working condition and the second angle of the variable injector under each working condition are constructed, and the cone angle selection test results corresponding to each type of engine are obtained.

[0019] Optionally, adjusting the spray hole cone angle of the variable fuel injector based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector includes:

[0020] Performing a first adjustment on the cone angle of the upper row of spray holes of the variable fuel injector according to a first maximum value of the first angle and a third maximum value of the second angle to obtain an adjusted cone angle of the upper row of spray holes;

[0021] Performing a first adjustment on the cone angle of the lower row of spray holes of the variable fuel injector according to the second maximum value of the first angle and the fourth maximum value of the second angle, to obtain an adjusted cone angle of the lower row of spray holes;

[0022] The variable fuel injector is subjected to a second adjustment based on the cone angles of the upper row of spray holes and the lower row of spray holes after the first adjustment to obtain the cone angles of the upper row of spray holes and the lower row of spray holes in the variable fuel injector.

[0023] Optionally, performing a first adjustment on the cone angle of the upper row of spray holes of the variable injector according to a first maximum value of the first angle and a third maximum value of the second angle to obtain the adjusted cone angle of the upper row of spray holes includes:

[0024] Determine whether a first maximum value of the first angle is greater than a third maximum value of the second angle;

[0025] If it is greater than, the first maximum value is used as the first target cone angle;

[0026] If it is less than, taking the third maximum value as the first target cone angle;

[0027] The rotating device at the upper row of spray holes of the variable fuel injector is controlled to rotate the upper row of spray holes so that the cone angle of the upper row of spray holes is smaller than the first target cone angle, thereby obtaining the adjusted cone angle of the upper row of spray holes.

[0028] Optionally, performing a second adjustment on the variable fuel injector based on the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes after the first adjustment to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector includes:

[0029] determining whether the cone angle of the upper row of spray holes of the variable fuel injector is greater than the cone angle of the lower row of spray holes of the variable fuel injector;

[0030] If it is greater than, it is determined not to adjust the cone angle of the upper row of nozzle holes and the cone angle of the lower row of nozzle holes;

[0031] If it is less than, control the rotating device at the upper row of spray holes of the variable injector to make a second adjustment to the upper row of spray holes so that the cone angle of the upper row of spray holes is greater than the cone angle of the lower row of spray holes, and obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector after adjustment.

[0032] Optionally, also include:

[0033] Based on the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector, respectively, the pre-calibrated oil injection parameters are searched to obtain the spray hole opening time and power-on time of the upper row of spray holes and the spray hole opening time and power-on time of the lower row of spray holes;

[0034] Fuel is applied to the upper row of spray holes according to the spray hole opening time and power-on time of the upper row of spray holes, and fuel is applied to the lower row of spray holes according to the spray hole opening time and power-on time of the lower row of spray holes.

[0035] A second aspect of an embodiment of the present invention shows a variable injector adjustment device, which is applied to an ECU, and the device includes:

[0036] An acquisition unit, used to acquire the current operating condition of the engine;

[0037] a determination unit, configured to determine the first angle and the second angle from a cone angle selection test result corresponding to the development information of the engine based on the operating condition;

[0038] A processing unit is used to adjust the cone angle of the spray hole of the variable injector based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector.

[0039] Optionally, determine the unit, specifically for:

[0040] determining a type of the engine based on development information of the engine;

[0041] The first angle and the second angle corresponding to the working condition are determined from the cone angle selection test results corresponding to the type of the engine, and the cone angle selection test results are obtained by pre-processing.

[0042] Optionally, a processing unit is used to:

[0043] Performing a first adjustment on the cone angle of the upper row of spray holes of the variable fuel injector according to a first maximum value of the first angle and a third maximum value of the second angle to obtain an adjusted cone angle of the upper row of spray holes;

[0044] Performing a first adjustment on the cone angle of the lower row of spray holes of the variable fuel injector according to the second maximum value of the first angle and the fourth maximum value of the second angle, to obtain an adjusted cone angle of the lower row of spray holes;

[0045] The variable fuel injector is subjected to a second adjustment based on the cone angles of the upper row of spray holes and the lower row of spray holes after the first adjustment to obtain the cone angles of the upper row of spray holes and the lower row of spray holes in the variable fuel injector.

[0046] Based on the above-mentioned embodiment of the present invention, a variable injector adjustment method and device are provided, which are applied to ECU, and the method includes: obtaining the working condition of the current engine during operation; determining the first angle and the second angle from the cone angle selection test results corresponding to the engine development information based on the working condition; adjusting the cone angle of the spray hole of the variable injector based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector. In an embodiment of the present invention, a variable injector with a rotatable spray hole is shown, and the optimal cone angle of the spray hole in the variable injector under different working conditions is determined according to different working conditions, so that the cone angle is matched to the best, so as to flexibly adjust the oil distribution, thereby optimizing the engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0048] Figure 1 A schematic diagram of an electronic control unit ECU, an engine and a variable injector shown in an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of a specific structure of a variable fuel injector according to an embodiment of the present invention;

[0050] Figure 3 A flow chart of a method for adjusting a variable fuel injector according to an embodiment of the present invention;

[0051] Figure 4A schematic diagram of a cone angle selection test operating point according to an embodiment of the present invention;

[0052] Figure 5 A schematic diagram of simulation showing the effect of the injector cone angle on the oil distribution according to an embodiment of the present invention;

[0053] Figure 6 A schematic diagram of a left spray hole in a variable fuel injector according to an embodiment of the present invention;

[0054] Figure 7 A schematic diagram of a right spray hole in a variable fuel injector according to an embodiment of the present invention;

[0055] Figure 8 A schematic flow chart of another method for adjusting a variable fuel injector according to an embodiment of the present invention;

[0056] Fig. 9 This is an example diagram of a double-row nozzle calibration strategy according to an embodiment of the present invention;

[0057] Fig.10 The present invention is a schematic structural diagram of a variable fuel injector adjustment device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0060] It should be noted that the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0061] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0062] See also Figure 1 This is a schematic diagram of an electronic control unit ECU, an engine and a variable injector according to an embodiment of the present invention.

[0063] The ECU 10 is connected to the engine 20 and the variable injector 30 respectively;

[0064] The process of implementing the variable injector adjustment method based on the above architecture includes:

[0065] The ECU 10 obtains the operating conditions of the current engine 20; determines a first angle and a second angle from the cone angle selection test results corresponding to the engine development information based on the operating conditions; adjusts the spray hole cone angle of the variable injector 30 based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector.

[0066] Continue to see Figure 1 The variable injector 30 is disposed in a combustion chamber of the engine 20 .

[0067] It should be noted that the embodiment of the present invention also discloses a specific schematic diagram of the variable injector structure, such as Figure 2 shown.

[0068] The variable fuel injector 30 is a double-row hole fuel injector, and includes a first needle valve 31 , a second needle valve 32 , an upper row of spray holes 33 , a lower row of spray holes 34 , and a rotating device 35 .

[0069] It should be noted that the first needle valve 31 and the second needle valve 32 are both hollow and are usually disposed in a needle valve body (not shown in the figure).

[0070] The number of the upper row of spray holes 33 and the number of the lower row of spray holes 34 are both 2, and a rotating device 35 is respectively provided at each upper row of spray holes 33 and lower row of spray holes 34. The rotating device 35 is connected to the ECU 10 through a hollow needle valve, so that the first needle valve 31 can realize independent control of the upper row of spray holes 33, and the second needle valve 32 can realize independent control of the row of spray holes 34.

[0071] Based on the specific structure diagram of the variable injector shown above, the process of implementing the adjustment method of the variable injector is as follows: Figure 3 FIG. 1 is a flow chart of a method for adjusting a variable injector according to an embodiment of the present invention, wherein the method comprises:

[0072] Step S301: Obtain the current operating condition of the engine.

[0073] In the specific implementation of step S301, various sensors installed outside the engine are used in real time to obtain corresponding sensor parameters, find the corresponding relationship between the sensor parameters and the operating conditions, and determine the operating conditions of the vehicle during operation.

[0074] It should be noted that the various types of sensors include temperature sensors and speed sensors, etc., and the sensor parameters include environmental parameters, temperature parameters, and speed parameters, etc.

[0075] The correspondence between the sensor parameters and the working conditions is set in advance based on multiple experiments.

[0076] The operating conditions include high-speed operating conditions, bumpy operating conditions, etc.

[0077] In the embodiment of the present invention, each time a change in the operating condition of the engine is detected, the cone angle of the variable injector is adjusted, that is, the process from step S302 to step S303 is executed.

[0078] Step S302: determining a first angle and a second angle from a cone angle selection test result corresponding to the engine development information based on the operating condition;

[0079] It should be noted that the process of pre-processing the cone angle selection test results includes:

[0080] Step S11: for different types of engines, determine whether the basic parameters of the engine meet the preset requirements. If yes, execute step S12; if not, return to execute step S11.

[0081] Basic parameters include engine exhaust temperature, smoke density, explosion pressure, etc.

[0082] In the process of implementing step S11, it is determined whether the exhaust temperature of the engine meets the preset exhaust temperature requirements, whether the smoke density meets the preset smoke density requirements, and whether the explosion pressure of the engine meets the preset explosion pressure requirements, etc. If all are satisfied, step S12 is executed on the premise that the exhaust temperature, smoke density, explosion pressure and other requirements are met. If not, return to execute step S11.

[0083] Step S12: according to different working conditions, obtaining the maximum torque and maximum speed of the engine.

[0084] In the specific implementation of step S12, the engine is tested for different working conditions to determine the maximum values ​​of the torque and the speed that can be achieved under each working condition, that is, the maximum torque and the maximum speed of the engine.

[0085] Step S13: determining a first angle of the variable injector under each operating condition based on the maximum torque and maximum speed of the engine.

[0086] In the specific implementation of step S13, for each working condition, the cone angles of multiple single-row spray hole injectors are tested according to the maximum torque value and the maximum speed value. Specifically, the working point (a, b, c, d) on the external characteristic is first selected to perform the cone angle selection test, which can be as follows: Figure 4 As shown, it is determined that the oil sprayed by the single-row spray hole injector can achieve the best engine performance at that cone angle, and the cone angle is used as the optimal cone angle under the working condition, that is, the first angle, and then the first angle of the variable injector under each working condition is determined.

[0087] It should be noted that the first angle includes a first maximum value, ie, a maximum value α1, and a second maximum value α2, ie, a minimum value.

[0088] The external characteristic refers to the curve of the engine torque (developed design power) measured when the engine throttle opening is 100% and the speed changes.

[0089] Step S14: for each type of engine, based on the emission requirements of the engine, determining the second angle of the variable injector under each operating condition.

[0090] In the specific implementation of step S14, several operating points x on the universal operating condition are selected according to the emission requirements of the engine, such as Figure 4 As shown, according to the emission requirements, the selection experiment of the injector cone angle is carried out on the engine test bench, and for each operating point, it is determined at which cone angle the oil sprayed by the single-row spray hole injector can achieve the best engine performance, and this cone angle is used as the optimal cone angle under this operating condition, that is, the second angle, and then the second angle of the variable injector under each operating condition is determined.

[0091] It should be noted that the second angle includes a third maximum value, ie, a maximum value α3, and a fourth maximum value α4, ie, a minimum value.

[0092] It should be noted that the effect of the injector cone angle on the oil distribution can be simulated on the engine test bench. Figure 5 As shown, α is the injector cone angle. For a step-type combustion chamber, the matching of the injector cone angle and the combustion chamber throat distributes the fuel to different areas of the combustion chamber.

[0093] Step S15: construct the type corresponding to the engine, the corresponding relationship between the first angle of the variable injector under each working condition and the second angle of the variable injector under each working condition, and obtain the cone angle selection test result corresponding to each type of engine.

[0094] Based on the cone angle selection test results generated in the above steps S11 to S15, the process of implementing step S302 specifically includes the following steps:

[0095] Step S21: determining the type of the engine based on the development information of the engine;

[0096] In the specific implementation of step S21, the correspondence between the development information and the type is searched based on the development information of the engine, such as version, emission requirements and other parameters, to obtain the type of the engine.

[0097] It should be noted that the correspondence between development information and types is divided when the injector cone angle experiment is carried out on the engine test bench.

[0098] Step S22: determining a first angle and a second angle corresponding to the working condition from the cone angle selection test results corresponding to the type of the engine.

[0099] In the process of specifically implementing step S22, the cone angle selection test results corresponding to the type of the engine are obtained, and the first angle of the variable injector under each operating condition in the cone angle selection test results is found to determine the first angle corresponding to the operating condition; then the second angle of the variable injector under each operating condition in the cone angle selection test results is found to determine the second angle corresponding to the operating condition.

[0100] Step S303: adjusting the spray hole cone angle of the variable fuel injector based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector.

[0101] It should be noted that the specific process of implementing step S303 includes the following steps:

[0102] Step S31: performing a first adjustment on the cone angle of the upper row of spray holes of the variable fuel injector according to the first maximum value of the first angle and the third maximum value of the second angle to obtain the adjusted cone angle of the upper row of spray holes;

[0103] It should be noted that the specific process of implementing step S31 includes the following steps:

[0104] Step S41: Determine whether the first maximum value of the first angle is greater than the third maximum value of the second angle. If so, execute step S42; if not, execute step S43.

[0105] Step S42: taking the first maximum value as the first target cone angle.

[0106] Step S43: taking the third maximum value as the first target cone angle.

[0107] In the process of implementing steps S41 to S43, the ECU compares the first maximum value of the first angle and the third maximum value of the second angle. If the first maximum value is greater than the third maximum value, the first maximum value is used as the first target cone angle. If the first maximum value is less than the third maximum value, the third maximum value is used as the first target cone angle.

[0108] Step S44: controlling the rotating device at the upper row of spray holes of the variable fuel injector to rotate the upper row of spray holes so that the cone angle of the upper row of spray holes is smaller than the first target cone angle, thereby obtaining the adjusted cone angle of the upper row of spray holes.

[0109] In the specific implementation of step S44, for the upper row of spray holes on the left side of the variable injector, the cone angle of the upper row of spray holes forms a cone angle α with the side wall of the combustion chamber, such as Figure 6 As shown, the current cone angle of the upper row of spray holes is obtained, and the current cone angle is compared with the first target cone angle. If the current cone angle is smaller than the first target cone angle, the rotating device at the upper row of spray holes of the variable injector is controlled to rotate the upper row of spray holes on the left side in a clockwise or counterclockwise direction, so that the cone angle of the upper row of spray holes is smaller than the first target cone angle; if the current cone angle is greater than or equal to the first target cone angle, the rotating device at the upper row of spray holes of the variable injector is controlled to rotate the upper row of spray holes on the left side in a counterclockwise direction, so that the cone angle of the upper row of spray holes is smaller than the first target cone angle; and the cone angle of the upper row of spray holes at this time is recorded, that is, the cone angle of the upper row of spray holes after adjustment is obtained.

[0110] Similarly, for the upper row of spray holes on the right side of the variable injector, the cone angle of the upper row of spray holes forms a cone angle α with the side wall of the combustion chamber, such as Figure 7As shown, if the current cone angle is greater than or equal to the first target cone angle, the rotating device at the upper row of spray holes of the variable injector is controlled to rotate the upper row of spray holes on the left side in a clockwise direction so that the cone angle of the upper row of spray holes is smaller than the first target cone angle; and the cone angle of the upper row of spray holes at this time is recorded, that is, the cone angle of the upper row of spray holes after adjustment is obtained.

[0111] If the current cone angle is smaller than the first target cone angle, the rotation mode of the upper row of nozzle holes on the right side is the same as the rotation mode of the upper row of nozzle holes on the left side, and they can refer to each other.

[0112] It should be noted that, generally, there is no situation where the first maximum value is equal to the third maximum value. If the first maximum value is equal to the third maximum value, the first maximum value or the third maximum value is used as the first target cone angle.

[0113] The cone angles of the upper row of nozzles on the right and the upper row of nozzles on the left are the same.

[0114] Step S32: performing a first adjustment on the cone angle of the lower row of spray holes of the variable fuel injector according to the second maximum value of the first angle and the fourth maximum value of the second angle to obtain the cone angle of the lower row of spray holes after adjustment;

[0115] In the process of implementing step S32, the ECU compares the second maximum value of the first angle with the fourth maximum value of the second angle. If the second maximum value is smaller than the fourth maximum value, the second maximum value is used as the second target cone angle. If the second maximum value is greater than the fourth maximum value, the fourth maximum value is used as the second target cone angle.

[0116] For the lower row of spray holes on the left side of the variable injector, the cone angle of the lower row of spray holes forms a cone angle α with the side wall of the combustion chamber, such as Figure 6 As shown, the current cone angle of the lower row of spray holes is obtained, and the current cone angle is compared with the second target cone angle. If the current cone angle is greater than the second target cone angle, the rotating device at the upper row of spray holes of the variable injector is controlled to rotate the upper row of spray holes on the left side in a clockwise or counterclockwise direction, so that the cone angle of the lower row of spray holes is greater than the second target cone angle; if the current cone angle is less than or equal to the second target cone angle, the rotating device at the lower row of spray holes of the variable injector is controlled to rotate the lower row of spray holes on the left side in a counterclockwise direction, so that the cone angle of the lower row of spray holes is greater than the second target cone angle; and the cone angle of the upper row of spray holes at this time is recorded, that is, the cone angle of the lower row of spray holes after adjustment is obtained.

[0117] Similarly, for the lower row of spray holes on the right side of the variable injector, the cone angle of the lower row of spray holes forms a cone angle α with the side wall of the combustion chamber, such as Figure 7As shown, if the current cone angle is less than or equal to the second target cone angle, the rotating device at the lower row of spray holes of the variable injector is controlled to rotate the lower row of spray holes on the right side in a counterclockwise direction so that the cone angle of the lower row of spray holes is greater than the second target cone angle; and the cone angle of the lower row of spray holes at this time is recorded, that is, the cone angle of the lower row of spray holes after adjustment is obtained.

[0118] If the current cone angle is greater than the second target cone angle, the rotation mode of the lower row of nozzles on the right side is the same as the rotation mode of the lower row of nozzles on the left side, and they can refer to each other.

[0119] It should be noted that, generally, there is no situation where the second maximum value is equal to the fourth maximum value. If the second maximum value is equal to the fourth maximum value, the second maximum value or the fourth maximum value is used as the second target cone angle.

[0120] The cone angles of the lower row of nozzles on the right and the lower row of nozzles on the left are the same.

[0121] Step S33: performing a second adjustment on the variable fuel injector based on the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes after the first adjustment to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector.

[0122] It should be noted that the specific implementation of step S33 includes the following steps:

[0123] Step S51: Determine whether the cone angle of the upper row of spray holes of the variable injector is greater than the cone angle of the lower row of spray holes of the variable injector. If so, determine not to adjust the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes. If so, execute step S52.

[0124] Step S52: Control the rotating device at the upper row of spray holes of the variable fuel injector to perform a second adjustment on the upper row of spray holes so that the cone angle of the upper row of spray holes is greater than the cone angle of the lower row of spray holes, thereby obtaining the cone angles of the upper row of spray holes and the lower row of spray holes in the variable fuel injector after adjustment.

[0125] In the process of implementing step S51 and step S52, the ECU compares the recorded cone angles of the upper row of spray holes of the variable injector and the cone angles of the lower row of spray holes of the variable injector. For the cone angles of the upper row of spray holes and the lower row of spray holes on the same side, if the cone angle of the upper row of spray holes is greater than the cone angle of the lower row of spray holes, the cone angles of the upper row of spray holes and the cone angles of the lower row of spray holes are not adjusted, that is, the second adjusted angle is determined to be 0; if the cone angle of the upper row of spray holes is less than or equal to the cone angle of the lower row of spray holes, the difference between the cone angles of the upper row of spray holes and the lower row of spray holes is calculated to obtain the difference cone angle; the rotating device at the upper row of spray holes of the variable injector is controlled to rotate the upper row of spray holes in the manner of the above-mentioned steps S31 and step S32, so that the cone angle of the upper row of spray holes is greater than the cone angle of the lower row of spray holes, thereby determining the cone angles of the upper row of spray holes and the lower row of spray holes after adjustment.

[0126] The variable injector shown in the present invention is a double-row hole injector, and the cone angle of the spray hole can be changed through the process of the above steps S301 to S303. Further, by widening the external characteristic curve of the engine, a wider range of engine speed and torque improvement can be achieved.

[0127] In an embodiment of the present invention, a rotatable variable injector is shown, and the optimal cone angle of the spray hole in the variable injector under different working conditions is determined according to different working conditions, and a first angle and a second angle are determined from the cone angle selection test results corresponding to the development information of the engine based on the working conditions; the cone angle of the spray hole of the variable injector is adjusted based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector, so that the cone angle can be matched to the best, so as to flexibly adjust the oil distribution, thereby optimizing the engine performance.

[0128] Based on the variable fuel injector adjustment method shown in the above embodiment of the present invention, the embodiment of the present invention also shows a flow chart of another variable fuel injector adjustment method, such as Figure 8 As shown, the method includes:

[0129] Step S801: Obtain the current operating condition of the engine.

[0130] Step S802: determining a first angle and a second angle from a cone angle selection test result corresponding to the engine development information based on the operating condition;

[0131] Step S803: adjusting the spray hole cone angle of the variable fuel injector based on the first angle and the second angle to obtain the adjusted cone angle of the lower row of spray holes.

[0132] It should be noted that the specific implementation process of step S801 to step S803 is the same as the specific implementation process of the above-mentioned specific implementation step S301 to step S303, and they can refer to each other.

[0133] Step S804: based on the cone angles of the upper row of spray holes and the lower row of spray holes in the variable injector, searching for pre-calibrated oil injection parameters, obtaining the spray hole opening time and power-on time of the upper row of spray holes, and the spray hole opening time and power-on time of the lower row of spray holes.

[0134] It should be noted that the nozzle opening time and power-on time are calibrated using the cone angle of the nozzle. Specifically, under various working conditions, the oil volume distribution in the upper and lower parts of the combustion chamber caused by the oil volume sprayed from the upper and lower rows of nozzles under the cone angles of the upper and lower rows of nozzles, as well as the combustion effect of the fuel are obtained through experiments, so as to determine the nozzle opening time and power-on time of the upper row of nozzles, and the nozzle opening time and power-on time of the lower row of nozzles; the oil volume injection parameters are obtained by calibrating the nozzle opening time and power-on time corresponding to different cone angles of the upper row of nozzles under different working conditions, and the nozzle opening time and power-on time corresponding to different cone angles of the lower row of nozzles, and stored in the form of a MAP diagram.

[0135] In the process of implementing step S803, the pre-calibrated oil injection parameters are searched to determine the nozzle opening time and power-on time corresponding to the cone angle of the upper row of nozzles. Then, the pre-calibrated oil injection parameters are searched to determine the nozzle opening time and power-on time corresponding to the cone angle of the lower row of nozzles.

[0136] It should be noted that the power-on time refers to the duration of fuel injection.

[0137] Step S805: applying fuel to the upper row of spray holes according to the spray hole opening time and power-on time of the upper row of spray holes, and applying fuel to the lower row of spray holes according to the spray hole opening time and power-on time of the lower row of spray holes.

[0138] In the process of implementing step S805, the ECU controls the first needle valve to control the fuel to be sprayed through the upper row of spray holes according to the spray hole opening time of the upper row of spray holes, and continues to spray for the power-on time. When the continuous spraying reaches the power-on time, the first needle valve is controlled to be cut off; similarly, the second needle valve is controlled to control the fuel to be sprayed through the lower row of spray holes according to the spray hole opening time of the lower row of spray holes, and continues to spray for the power-on time. When the continuous spraying reaches the power-on time, the second needle valve is controlled to be cut off.

[0139] It should be noted that, in the process of implementing step S803 and step S804, if the opening time of the upper row of nozzles is T1, the opening time of the lower row of nozzles is T2, and T1 is less than T2, then Fig. 9 As shown, the fuel sprayed from the upper row of spray holes is started at TI time, and the fuel sprayed from the lower row of spray holes is started at T2 time, and their power-on times are also inconsistent.

[0140] The present invention calibrates different injection strategies (spray hole opening time and power-on time) for the double-row hole injector, which can make the engine hardware easier to match and further improve the engine performance.

[0141] In an embodiment of the present invention, the amount of oil sprayed from the upper and lower rows of spray holes and the injection time are adjusted by adjusting the spray hole opening time and the power-on time to adjust the oil distribution in the upper and lower parts of the combustion chamber, so that the oil and gas distribution in the cylinder is more uniform, improving the combustion in the cylinder, so that the engine can achieve good fuel consumption and emission effects.

[0142] Based on the variable fuel injector adjustment method shown in the above embodiment of the present invention, correspondingly, another variable fuel injector adjustment device is shown in the embodiment of the present invention, such as Fig.10 As shown, the device comprises:

[0143] An acquisition unit 1001 is used to acquire the operating condition of the current engine operation;

[0144] A determination unit 1002, configured to determine a first angle and a second angle from a cone angle selection test result corresponding to the engine development information based on the operating condition;

[0145] The processing unit 1003 is configured to adjust the spray hole cone angle of the variable fuel injector based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector.

[0146] It should be noted that the specific implementation process of each unit of the variable fuel injector adjustment device shown in the above embodiment of the present invention is the same as the specific implementation process of the variable fuel injector adjustment method shown in the above embodiment, and they can refer to each other.

[0147] Based on the adjustment device of the variable injector shown in the above embodiment of the present invention, the determination unit 1002 is specifically used for:

[0148] determining a type of the engine based on development information of the engine;

[0149] The first angle and the second angle corresponding to the working condition are determined from the cone angle selection test results corresponding to the type of the engine, and the cone angle selection test results are obtained by pre-processing.

[0150] The process of pre-processing the cone angle selection test results includes:

[0151] For different types of engines, determining whether the basic parameters of the engine meet preset requirements;

[0152] If satisfied, obtaining the maximum torque and maximum speed of the engine according to different working conditions;

[0153] Determining a first angle of the variable injector under each operating condition based on a maximum torque value and a maximum speed value of the engine;

[0154] For each type of engine, based on the emission requirements of the engine, determining a second angle of the variable injector under each operating condition;

[0155] The type corresponding to the engine, the corresponding relationship between the first angle of the variable injector under each working condition and the second angle of the variable injector under each working condition are constructed, and the cone angle selection test results corresponding to each type of engine are obtained.

[0156] In an embodiment of the present invention, a rotatable variable injector is shown, and the optimal cone angle of the spray hole in the variable injector under different working conditions is determined according to different working conditions, and a first angle and a second angle are determined from the cone angle selection test results corresponding to the development information of the engine based on the working conditions; the cone angle of the spray hole of the variable injector is adjusted based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector, so that the cone angle can be matched to the best, so as to flexibly adjust the oil distribution, thereby optimizing the engine performance.

[0157] Based on the adjustment device for the variable fuel injector shown in the above embodiment of the present invention, the processing unit 1003 is specifically used for:

[0158] Performing a first adjustment on the cone angle of the upper row of spray holes of the variable fuel injector according to a first maximum value of the first angle and a third maximum value of the second angle to obtain an adjusted cone angle of the upper row of spray holes;

[0159] Performing a first adjustment on the cone angle of the lower row of spray holes of the variable fuel injector according to the second maximum value of the first angle and the fourth maximum value of the second angle, to obtain the cone angle of the lower row of spray holes after adjustment;

[0160] The variable fuel injector is subjected to a second adjustment based on the cone angles of the upper row of spray holes and the lower row of spray holes after the first adjustment to obtain the cone angles of the upper row of spray holes and the lower row of spray holes in the variable fuel injector.

[0161] The step of first adjusting the cone angle of the upper row of spray holes of the variable injector according to the first maximum value of the first angle and the third maximum value of the second angle to obtain the adjusted cone angle of the upper row of spray holes includes:

[0162] Determine whether a first maximum value of the first angle is greater than a third maximum value of the second angle;

[0163] If it is greater than, the first maximum value is used as the first target cone angle;

[0164] If it is less than, taking the third maximum value as the first target cone angle;

[0165] The rotating device at the upper row of spray holes of the variable fuel injector is controlled to rotate the upper row of spray holes so that the cone angle of the upper row of spray holes is smaller than the first target cone angle, thereby obtaining the adjusted cone angle of the upper row of spray holes.

[0166] The variable fuel injector is subjected to a second adjustment based on the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes after the first adjustment to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector, including:

[0167] determining whether the cone angle of the upper row of spray holes of the variable fuel injector is greater than the cone angle of the lower row of spray holes of the variable fuel injector;

[0168] If it is greater than, it is determined not to adjust the cone angle of the upper row of nozzle holes and the cone angle of the lower row of nozzle holes;

[0169] If it is less than, control the rotating device at the upper row of spray holes of the variable injector to make a second adjustment to the upper row of spray holes so that the cone angle of the upper row of spray holes is greater than the cone angle of the lower row of spray holes, and obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector after adjustment.

[0170] Based on the adjusting device for the variable fuel injector shown in the above embodiment of the present invention, the processing unit 1003 is further used for:

[0171] Based on the cone angles of the upper row of spray holes and the lower row of spray holes in the variable injector, the pre-calibrated oil injection parameters are searched to obtain the spray hole opening time and power-on time of the upper row of spray holes, and the spray hole opening time and power-on time of the lower row of spray holes.

[0172] Fuel is applied to the upper row of spray holes according to the spray hole opening time and power-on time of the upper row of spray holes, and fuel is applied to the lower row of spray holes according to the spray hole opening time and power-on time of the lower row of spray holes.

[0173] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0174] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0175] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for adjusting a variable fuel injector, characterized in that: Applied to ECU, the method comprises: Get the current operating condition of the engine; Determining a first angle and a second angle from a cone angle selection test result corresponding to the engine development information based on the operating condition; the first angle is determined based on a maximum torque value and a maximum speed value of the engine, and the second angle is determined based on an emission requirement of the engine; The cone angle of the spray hole of the variable fuel injector is adjusted based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector.

2. The method according to claim 1, characterized in that: Determining the first angle and the second angle from the cone angle selection test results corresponding to the engine development information based on the operating condition includes: determining a type of the engine based on development information of the engine; The first angle and the second angle corresponding to the working condition are determined from the cone angle selection test results corresponding to the type of the engine, and the cone angle selection test results are obtained by pre-processing.

3. The method according to claim 2, characterized in that The process of pre-processing the cone angle selection test results includes: For different types of engines, determining whether the basic parameters of the engine meet preset requirements; If satisfied, obtaining the maximum torque and maximum speed of the engine according to different working conditions; Determining a first angle of the variable injector under each operating condition based on a maximum torque value and a maximum speed value of the engine; For each type of engine, based on the emission requirements of the engine, determining a second angle of the variable injector under each operating condition; The type corresponding to the engine, the corresponding relationship between the first angle of the variable injector under each working condition and the second angle of the variable injector under each working condition are constructed, and the cone angle selection test results corresponding to each type of engine are obtained.

4. The method according to claim 1, characterized in that: The cone angle of the spray hole of the variable fuel injector is adjusted based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector, including: Performing a first adjustment on the cone angle of the upper row of spray holes of the variable fuel injector according to a first maximum value of the first angle and a third maximum value of the second angle to obtain an adjusted cone angle of the upper row of spray holes; Performing a first adjustment on the cone angle of the lower row of spray holes of the variable fuel injector according to the second maximum value of the first angle and the fourth maximum value of the second angle, to obtain an adjusted cone angle of the lower row of spray holes; The variable fuel injector is subjected to a second adjustment based on the cone angles of the upper row of spray holes and the lower row of spray holes after the first adjustment to obtain the cone angles of the upper row of spray holes and the lower row of spray holes in the variable fuel injector.

5. The method according to claim 4, characterized in that The cone angle of the upper row of spray holes of the variable injector is first adjusted according to the first maximum value of the first angle and the third maximum value of the second angle to obtain the adjusted cone angle of the upper row of spray holes, including: Determine whether a first maximum value of the first angle is greater than a third maximum value of the second angle; If it is greater than, the first maximum value is used as the first target cone angle; If it is less than, taking the third maximum value as the first target cone angle; The rotating device at the upper row of spray holes of the variable fuel injector is controlled to rotate the upper row of spray holes so that the cone angle of the upper row of spray holes is smaller than the first target cone angle, thereby obtaining the adjusted cone angle of the upper row of spray holes.

6. The method according to claim 4, characterized in that The variable fuel injector is adjusted for a second time based on the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes after the first adjustment to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable fuel injector, including: determining whether the cone angle of the upper row of spray holes of the variable fuel injector is greater than the cone angle of the lower row of spray holes of the variable fuel injector; If it is greater than, it is determined not to adjust the cone angle of the upper row of nozzle holes and the cone angle of the lower row of nozzle holes; If it is less than, control the rotating device at the upper row of spray holes of the variable injector to make a second adjustment to the upper row of spray holes so that the cone angle of the upper row of spray holes is greater than the cone angle of the lower row of spray holes, and obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector after adjustment.

7. The method according to claim 1, characterized in that Also includes: Based on the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector, respectively, the pre-calibrated oil injection parameters are searched to obtain the spray hole opening time and power-on time of the upper row of spray holes and the spray hole opening time and power-on time of the lower row of spray holes; Fuel is applied to the upper row of spray holes according to the spray hole opening time and power-on time of the upper row of spray holes, and fuel is applied to the lower row of spray holes according to the spray hole opening time and power-on time of the lower row of spray holes.

8. A variable fuel injector adjustment device, characterized in that: Applied to ECU, the device comprises: An acquisition unit, used to acquire the current operating condition of the engine; a determination unit, configured to determine a first angle and a second angle from a cone angle selection test result corresponding to the development information of the engine based on the operating condition; the first angle is determined based on a maximum torque value and a maximum speed value of the engine, and the second angle is determined based on an emission requirement of the engine; A processing unit is used to adjust the cone angle of the spray hole of the variable injector based on the first angle and the second angle to obtain the cone angle of the upper row of spray holes and the cone angle of the lower row of spray holes in the variable injector.

9. The device according to claim 8, characterized in that Determine the unit, specifically for: determining a type of the engine based on development information of the engine; The first angle and the second angle corresponding to the working condition are determined from the cone angle selection test results corresponding to the type of the engine, and the cone angle selection test results are obtained by pre-processing.

10. The device according to claim 8, characterized in that The processing unit is specifically used for: Performing a first adjustment on the cone angle of the upper row of spray holes of the variable fuel injector according to a first maximum value of the first angle and a third maximum value of the second angle to obtain an adjusted cone angle of the upper row of spray holes; Performing a first adjustment on the cone angle of the lower row of spray holes of the variable fuel injector according to the second maximum value of the first angle and the fourth maximum value of the second angle, to obtain an adjusted cone angle of the lower row of spray holes; The variable fuel injector is subjected to a second adjustment based on the cone angles of the upper row of spray holes and the lower row of spray holes after the first adjustment to obtain the cone angles of the upper row of spray holes and the lower row of spray holes in the variable fuel injector.

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