Development method, device and gasoline injection engine for fuel jet landing point

Abstract

This invention discloses a method, apparatus, and gasoline injection engine for developing the fuel jet landing point. The method includes setting fuel jet injection path parameters when the distance from the injection point to the fuel jet cone impacting the wall meets a preset distance range; determining whether the injection distance parameter of the fuel jet in the intake manifold meets a preset parameter value based on the injection path parameters; if not, adjusting the fuel jet injection path parameters based on the injection distance parameters; if satisfied, determining whether the amount of fuel jet impacting the wall when the intake manifold valve is open meets a first proportion threshold and whether the amount of fuel evaporation when the intake manifold valve is closed meets a second proportion threshold; if both are satisfied, the development of the gasoline injection engine fuel jet landing point is completed, and the fuel injection of the gasoline injection engine is controlled by the injection path parameters. This application solves the technical problem that the adjustment of intake manifold injection quality in the prior art is mostly implemented for specific fuels and dedicated engines, and cannot be used in general-purpose engines.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a method, apparatus, and gasoline injection engine for developing fuel jet landing point. Background Technology

[0002] In recent years, traditional internal combustion engines have faced increasing challenges from fuel consumption regulations, emission regulations, and the development of new energy sources. Reducing the cost of internal combustion engines has become one of the goals pursued by major automakers. Among these efforts, gasoline engines that use port injection instead of cylinder injection can save significant costs.

[0003] Since the quality of port injection directly affects engine performance and emissions, current adjustments to port injection quality are mostly implemented for specific fuels and dedicated engines, and cannot be used in general-purpose engines. Summary of the Invention

[0004] This invention provides a method, apparatus, and gasoline injection engine for developing fuel jet landing point, which solves the technical problem that the adjustment of the injection quality of the intake port in the prior art is mostly implemented for specific fuels and dedicated engines, and cannot be used in general engines.

[0005] This invention provides a method for developing the fuel jet landing point of a gasoline injection engine, the method comprising:

[0006] When the distance from the injection point to the wall of the oil jet cone meets the preset distance range, the oil jet injection path parameters are set;

[0007] Based on the fuel injection path parameters, determine whether the fuel jet injection distance parameter in the intake manifold meets the preset parameter value;

[0008] If the conditions are not met, the injection path parameters of the fuel jet are adjusted based on the injection distance parameters;

[0009] If satisfied, then determine whether the amount of oil jet hitting the wall when the valve of the intake manifold is open meets the first proportion threshold and whether the amount of fuel evaporation when the valve of the intake manifold is closed meets the second proportion threshold.

[0010] If all conditions are met, the development of the fuel jet landing point for the gasoline injection engine is completed, and the fuel injection of the gasoline injection engine is controlled by the aforementioned fuel injection path parameters.

[0011] Further, determining whether the injection distance parameter of the fuel jet in the intake manifold meets the preset parameter value based on the fuel injection path parameters includes:

[0012] Based on the fuel injection path parameters, determine whether the first distance between the fuel jet at the fuel injection port and the inner wall of the intake manifold is greater than or equal to a first distance threshold.

[0013] If the first distance is greater than or equal to the first distance threshold, then determine whether the second distance between the contact surface of the oil jet on the intake valve and the seat cover in the exhaust direction is greater than or equal to the second distance threshold.

[0014] Further, if the first distance is less than the first distance threshold, adjusting the injection path parameters of the fuel jet based on the injection distance parameters includes:

[0015] The fuel injection path parameters of the fuel jet are adjusted based on the difference between the first distance and the first distance threshold.

[0016] Further, if the second distance is less than the second distance threshold, adjusting the injection path parameters of the fuel jet based on the injection distance parameters includes:

[0017] The fuel injection path parameters of the fuel jet are adjusted based on the difference between the second distance and the second distance threshold.

[0018] Furthermore, before determining whether the amount of fuel jet impacting the intake manifold wall when the intake manifold valve is open meets a first proportion threshold and whether the amount of fuel evaporation when the intake manifold valve is closed meets a second proportion threshold, the method further includes:

[0019] Based on the injection path parameters, hydrodynamic calculations are performed on the valve-opening and valve-closing injection of the intake manifold to obtain the amount of fuel jet impacting the intake manifold wall when the valve is open and the amount of fuel evaporation when the valve is closed.

[0020] Furthermore, before setting the injection path parameters of the oil jet, the method further includes:

[0021] Set the initial coordinates of the fuel injection point;

[0022] Determine whether the third distance from the injection point to the oil jet cone impact wall meets the preset distance range;

[0023] If the conditions are met, then the action of setting the injection path parameters of the oil jet is performed;

[0024] If the conditions are not met, the initial coordinates will be corrected.

[0025] Furthermore, the method also includes:

[0026] If the amount of oil jet impacting the wall when the valve is opened does not meet the first proportion threshold, or if the amount of fuel evaporation when the valve is closed does not meet the second proportion threshold, then the initial coordinates are corrected.

[0027] Furthermore, setting the injection path parameters of the oil jet includes:

[0028] Set the oil jet injection direction and the oil jet injection cone angle.

[0029] This invention also provides a device for developing the fuel jet landing point of a gasoline injection engine, the device comprising:

[0030] The parameter setting unit is used to set the injection path parameters of the oil jet when the distance from the injection point to the oil jet cone surface hitting the wall meets the preset distance range.

[0031] The first parameter determination unit is used to determine whether the injection distance parameter of the fuel jet in the intake manifold meets the preset parameter value based on the fuel injection path parameter.

[0032] A parameter correction unit is used to adjust the fuel injection path parameters of the fuel jet based on the injection distance parameters if the judgment result of the first parameter judgment unit is not satisfied.

[0033] The second parameter judgment unit is used to determine whether the amount of oil jet hitting the wall when the oil jet is open in the intake manifold meets the first proportion threshold and whether the amount of fuel evaporation when the oil jet is closed in the intake manifold meets the second proportion threshold if the judgment result of the first parameter judgment unit is satisfied.

[0034] The fuel injection control unit is used to complete the development of the fuel jet landing point of the gasoline injection engine if the judgment result of the second parameter judgment unit is satisfied, and to control the fuel injection of the gasoline injection engine with the fuel injection path parameters.

[0035] This invention also provides a gasoline injection engine that performs the gasoline injection engine fuel jet landing point development method described in any of the above embodiments.

[0036] This invention discloses a method, apparatus, and gasoline injection engine for developing the fuel jet landing point of an injecting gasoline engine. The method includes setting fuel jet injection path parameters when the distance from the injection point to the fuel jet cone impacting the wall meets a preset distance range; determining whether the injection distance parameter of the fuel jet in the intake manifold meets a preset parameter value based on the injection path parameters; if not, adjusting the fuel jet injection path parameters based on the injection distance parameters; if satisfied, determining whether the amount of fuel jet impacting the wall when the intake manifold valve is open meets a first proportion threshold and whether the amount of fuel evaporation when the intake manifold valve is closed meets a second proportion threshold; if both are satisfied, the development of the fuel jet landing point of the injecting gasoline engine is completed, and the fuel injection of the injecting gasoline engine is controlled by the fuel jet injection path parameters. This application determines whether the fuel injection path parameters meet the requirements by judging whether the fuel jet injection distance parameters, fuel jet impact amount, and fuel evaporation amount in the intake manifold meet the preset thresholds. This solves the technical problem that the adjustment of intake manifold injection quality in the prior art is mostly implemented for specific fuels and dedicated engines, and cannot be used in general engines. It achieves the technical effects of improving intake manifold injection quality, saving development costs, and greatly improving versatility. Attached Figure Description

[0037] Figure 1 This is a flowchart of a method for developing the fuel jet landing point of a gasoline injection engine, provided in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the structure of a fuel jet in the intake manifold of a gasoline injection engine provided by an embodiment of the present invention;

[0039] Figure 3 This is a flowchart of another method for developing the fuel jet landing point of a gasoline injection engine provided in an embodiment of the present invention;

[0040] Figure 4 This is a structural diagram of a device for developing the landing point of fuel jet in a gasoline injection engine, provided in an embodiment of the present invention. Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0042] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish different objects, not to limit a specific order. The various embodiments of this invention described below can be performed individually or in combination with each other; the embodiments of this invention do not impose specific limitations in this regard.

[0043] Figure 1 This is a flowchart of a method for developing the fuel jet landing point of a gasoline injection engine, provided in an embodiment of the present invention.

[0044] Figure 2 This is a schematic diagram of the structure of a fuel jet in the intake manifold of a gasoline injection engine provided by an embodiment of the present invention.

[0045] like Figure 1 As shown, the method for developing the fuel jet landing point of this gasoline injection engine specifically includes the following steps:

[0046] S101, when the distance from the injection point to the wall of the fuel jet cone meets the preset distance range, set the fuel jet injection path parameters.

[0047] Optionally, S101, setting the fuel injection path parameters of the fuel jet includes setting the fuel jet injection direction and the fuel jet injection cone angle.

[0048] Specifically, such as Figure 2As shown, an air intake duct 1 contains an air intake jet 2, which collides with the intake valve 3 and the surface of the intake duct 1. The distance 6 from the injection point O to the impact surface of the jet cone refers to the distance along the injection path of the jet 2 to the intake valve 3. It is determined whether the distance 6 from the injection point O to the impact surface of the jet cone falls within a preset distance range. If the determination result is yes, the injection path parameters of the jet are set. These parameters include at least the jet injection direction and the jet cone angle 7. Preferably, the jet cone angle 7 is set to 16°. It should be noted that the injection path parameters are set based on empirically estimated values ​​and then adjusted as needed in subsequent execution steps.

[0049] S102, based on the fuel injection path parameters, determines whether the fuel jet injection distance parameter in the intake manifold meets the preset parameter value.

[0050] Specifically, after setting the fuel injection path parameters, the injection distance parameters of the fuel jet 2 within the intake manifold 1 are obtained, such as... Figure 2 As shown, the injection distance parameters include the distance 5 between the fuel jet 2 at the fuel injector O and the inner wall of the intake manifold 1, and the distance 4 between the contact surface of the fuel jet 2 on the intake valve 3 and the sealing surface of the valve seat in the exhaust direction. After obtaining the injection distance parameters, the injection distance parameters are compared with preset parameter values ​​to determine whether the injection distance parameters meet the preset parameter values.

[0051] S103, if not satisfied, then adjust the fuel jet injection path parameters based on the injection distance parameters.

[0052] Specifically, if the injection distance parameter does not meet the preset parameter value, it indicates that the fuel injection path parameter setting of the fuel jet 2 is deviated. At this time, it is necessary to adjust the fuel injection path parameter based on the deviation value of the injection distance parameter, and after the adjustment is completed, step S102 is re-executed to determine whether the injection distance parameter of the fuel jet in the intake port meets the preset parameter value.

[0053] S104, if satisfied, then determine whether the amount of fuel jet hitting the wall when the valve of the fuel jet is open in the intake manifold meets the first proportion threshold and whether the amount of fuel evaporation when the valve of the fuel jet is closed in the intake manifold meets the second proportion threshold.

[0054] Specifically, if the injection distance parameter meets the preset parameter value, it is necessary to calculate the amount of fuel jet 2 impacting the wall when the valve of the intake manifold 1 is open. Then, by comparing the amount of fuel jet impacting the wall with the total amount of fuel injection, a first percentage of the amount of fuel jet impacting the wall is obtained. The first percentage is then compared with a first percentage threshold to determine whether the amount of fuel jet impacting the wall meets the first percentage threshold. Preferably, the first percentage threshold is 50%. Similarly, it is also necessary to calculate the amount of fuel evaporation when the valve of the intake manifold 1 is closed. Then, by comparing the amount of fuel evaporation with the total amount of fuel injection, a second percentage of the amount of fuel evaporation is obtained. The second percentage is then compared with a second percentage threshold to determine whether the amount of fuel evaporation meets the second percentage threshold. Preferably, the second percentage threshold is 90%.

[0055] If all conditions are met (S105), the development of the fuel jet landing point of the gasoline injection engine is completed, and the fuel injection of the gasoline injection engine is controlled by the fuel injection path parameters.

[0056] Specifically, if the amount of fuel jet impacting the wall meets the first proportion threshold and the amount of fuel evaporation meets the second proportion threshold, it indicates that the fuel injection path parameters at this time meet the requirements and can achieve better mixing of fuel jet and air. Thus, the development of the fuel jet landing point of the gasoline injection engine is completed, and the fuel injection of the gasoline injection engine is controlled by the fuel injection path parameters.

[0057] In this embodiment of the invention, since it is only necessary to determine whether the fuel injection path parameters meet the requirements by judging whether the fuel jet injection distance parameters, fuel jet impact amount, and fuel evaporation amount in the intake manifold meet preset thresholds, it can be applied to engines of various models and fuels without the need to develop a separate method for adjusting the intake manifold injection quality based on the engine model. This solves the technical problem in the prior art where adjustments to the intake manifold injection quality are mostly implemented for specific fuels and dedicated engines, and cannot be used in general-purpose engines. It achieves the technical effects of improving intake manifold injection quality, saving development costs, and greatly improving versatility.

[0058] Based on the above technical solutions, Figure 3 This is a flowchart of another method for developing the fuel jet landing point of a gasoline injection engine provided in an embodiment of the present invention, as shown below. Figure 3 As shown, S102 specifically includes:

[0059] S301, based on the fuel injection path parameters, determine whether the first distance between the fuel jet at the fuel injection port and the inner wall of the intake manifold is greater than or equal to the first distance threshold.

[0060] S302, if the first distance is greater than or equal to the first distance threshold, then determine whether the second distance between the contact surface of the oil jet on the intake valve and the cover of the valve seat in the exhaust direction is greater than or equal to the second distance threshold.

[0061] Specifically, the first distance 5 between the fuel jet 2 at the fuel injector O and the inner wall of the intake manifold 1 is obtained, and it is determined whether the first distance 5 is greater than or equal to the first distance threshold, wherein the first distance threshold can be set to 3mm. If the first distance 5 is greater than or equal to 3mm, the second distance 4 between the contact surface of the fuel jet 2 on the intake valve 3 and the cover of the valve seat in the exhaust direction is further obtained, and it is determined whether the second distance 4 is greater than or equal to the second distance threshold, wherein the second distance threshold can be set to 3mm.

[0062] Based on the above technical solutions, such as Figure 3 As shown, if the first distance is less than the first distance threshold, then S103 specifically includes:

[0063] S303, adjust the fuel jet injection path parameters based on the difference between the first distance and the first distance threshold.

[0064] Specifically, if the first distance 5 is less than the first distance threshold, it indicates that the fuel injection path parameter setting of the fuel jet 2 is deviated. At this time, it is necessary to adjust the fuel injection path parameter based on the deviation value of the first distance 5. After the adjustment is completed, the step S301 of judging whether the first distance between the fuel jet at the fuel injection port and the inner wall of the intake manifold is greater than or equal to the first distance threshold is executed again.

[0065] Based on the above technical solutions, such as Figure 3 As shown, if the second distance is less than the second distance threshold, then S103 specifically includes:

[0066] S304, adjust the fuel jet injection path parameters based on the difference between the second distance and the second distance threshold.

[0067] Specifically, if the second distance 4 is less than the second distance threshold, it indicates that the fuel injection path parameter setting of the fuel jet 2 is deviated. At this time, it is necessary to adjust the fuel injection path parameter based on the deviation value of the second distance 4. After the adjustment is completed, the step S301 of determining whether the first distance between the fuel jet at the fuel injection port and the inner wall of the intake manifold is greater than or equal to the first distance threshold is executed again.

[0068] Based on the above technical solutions, such as Figure 3 As shown, in S104, before determining whether the amount of fuel jet impacting the wall when the fuel jet is open in the intake manifold meets the first proportion threshold and whether the amount of fuel evaporation when the fuel jet is closed in the intake manifold meets the second proportion threshold, the method further includes:

[0069] S305, based on the injection path parameters, performs fluid dynamics calculations on the valve-opening and valve-closing injection of the intake port, and obtains the amount of fuel jet impacting the wall when the intake port valve is open and the amount of fuel evaporation when the intake port valve is closed.

[0070] Specifically, the amount of fuel jet 2 impacting the wall when the valve of intake 1 is open and the amount of fuel evaporation when the valve of intake 1 is closed can be calculated by computational fluid dynamics (CFD). CFD is equivalent to conducting experiments "virtually" on a computer to simulate actual fluid flow. Its basic principle is to numerically solve the differential equations controlling the fluid flow to obtain the discrete distribution of the fluid flow field in the continuous region, thereby approximating the fluid flow.

[0071] Optionally, such as Figure 3 As shown, before setting the fuel jet injection path parameters in S101, the method further includes:

[0072] S306, Set the initial coordinates of the fuel injection point.

[0073] Specifically, the initial coordinates of the injection point O are estimated values ​​based on experience, and then corrected as needed in subsequent execution steps.

[0074] S307, determine whether the third distance from the injection point to the oil jet cone impact wall meets the preset distance range; if it does, execute the action of setting the oil jet injection path parameters in S101; if it does not meet, correct the initial coordinates.

[0075] Specifically, firstly, it is necessary to obtain the third distance 6 from the injection point O to the impact wall of the fuel jet cone. Then, it is determined whether the third distance 6 falls within a preset distance range, which can be set to [60mm, 90mm] as needed. If the third distance 6 falls within the preset distance range, it indicates that the initial coordinates meet the requirements. At this time, the step of setting the fuel jet injection path parameters in S101 continues. If the third distance 6 does not fall within the preset distance range, it indicates that the initial coordinates do not meet the requirements. At this time, the initial coordinates need to be corrected according to the distance deviation of the third distance 6.

[0076] Optionally, such as Figure 3 As shown, the method for developing the fuel jet landing point of the gasoline injection engine further includes: if the amount of fuel jet impacting the wall when the valve is open does not meet the first proportion threshold, or if the amount of fuel evaporation when the valve is closed does not meet the second proportion threshold, then the initial coordinates are corrected.

[0077] Specifically, if the amount of fuel jet hitting the wall does not meet the first proportion threshold, or the amount of fuel evaporation does not meet the second proportion threshold, it indicates that the fuel injection path parameters cannot meet the requirements, that is, the degree of mixing and combustion of fuel jet and air has not reached the optimal level. In this case, the initial coordinates of the fuel injection point O need to be corrected so that the initial injection position of fuel jet 2 can meet the requirements.

[0078] In this embodiment of the invention, by judging whether the injection path parameters meet the requirements by determining whether the injection distance parameters of the fuel jet in the intake manifold, the amount of fuel jet impacting the wall, and the amount of fuel evaporation meet the preset threshold, the development quality and speed of the fuel jet landing point can be significantly improved, so that the developed port injection gasoline engine has high efficiency, high power and low emissions performance.

[0079] Figure 4 This is a structural diagram of a device for developing the landing point of fuel jet in a gasoline injection engine, provided in an embodiment of the present invention.

[0080] like Figure 4 As shown, the fuel jet landing point development device for gasoline injection engines specifically includes:

[0081] The parameter setting unit 41 is used to set the fuel injection path parameters of the fuel jet when the distance from the fuel injection point to the fuel jet cone surface hitting the wall meets the preset distance range.

[0082] The first parameter judgment unit 42 is used to determine whether the injection distance parameter of the fuel jet in the intake manifold meets the preset parameter value based on the fuel injection path parameter.

[0083] The parameter correction unit 43 is used to adjust the fuel injection path parameters of the fuel jet based on the injection distance parameters if the judgment result of the first parameter judgment unit is not satisfied.

[0084] The second parameter judgment unit 44 is used to determine whether the amount of oil jet hitting the wall when the valve of the oil jet is open in the intake manifold meets the first proportion threshold and whether the amount of fuel evaporation when the valve of the oil jet is closed in the intake manifold meets the second proportion threshold if the judgment result of the first parameter judgment unit is satisfied.

[0085] The fuel injection control unit 45 is used to complete the development of the fuel jet landing point of the gasoline injection engine if the judgment result of the second parameter judgment unit is satisfied, and to control the fuel injection of the gasoline injection engine with the fuel injection path parameters.

[0086] Optionally, the first parameter determination unit 42 includes:

[0087] The first judgment subunit is used to determine, based on the fuel injection path parameters, whether the first distance between the fuel jet at the fuel injection port and the inner wall of the intake manifold is greater than or equal to the first distance threshold.

[0088] The second judgment subunit is used to determine whether the second distance between the contact surface of the oil jet on the intake valve and the cover of the valve seat in the exhaust direction is greater than or equal to the second distance threshold if the judgment result of the first judgment subunit is that the first distance is greater than or equal to the first distance threshold.

[0089] Optionally, if the judgment result of the first judgment subunit is that the first distance is less than the first distance threshold, then the parameter correction unit 43 is specifically used for:

[0090] The fuel injection path parameters are adjusted based on the difference between the first distance and the first distance threshold.

[0091] Optionally, if the judgment result of the second judgment subunit is that the second distance is less than the second distance threshold, then the parameter correction unit 43 is specifically used for:

[0092] The fuel injection path parameters are adjusted based on the difference between the second distance and the second distance threshold.

[0093] Optionally, before the second parameter determination unit 44 determines whether the amount of fuel jet impacting the wall when the fuel jet is open in the intake manifold meets the first proportion threshold and whether the amount of fuel evaporation when the fuel jet is closed in the intake manifold meets the second proportion threshold, the device further includes:

[0094] The fuel quantity calculation unit is used to perform fluid dynamics calculations on the valve-opening and valve-closing injection of the intake port based on the injection path parameters, and to obtain the amount of fuel jet impacting the wall when the intake port valve is open and the amount of fuel evaporation when the intake port valve is closed, respectively.

[0095] Optionally, before the parameter setting unit 41 sets the fuel jet injection path parameters, the device further includes:

[0096] The coordinate setting unit is used to set the initial coordinates of the injection point;

[0097] The third parameter judgment unit is used to determine whether the third distance from the injection point to the oil jet cone impact wall meets the preset distance range; if it does, the parameter setting unit 41 performs the action of setting the oil jet injection path parameters; if it does not meet, the parameter setting unit 41 corrects the initial coordinates.

[0098] Optionally, if the judgment result of the second parameter judgment unit is that the amount of oil jet hitting the wall when the valve is open does not meet the first proportion threshold, or the amount of fuel evaporation when the valve is closed does not meet the second proportion threshold, then the parameter setting unit 41 is used to correct the initial coordinates.

[0099] Optionally, the parameter setting unit 41 is specifically used for:

[0100] Set the oil jet injection direction and the oil jet injection cone angle.

[0101] The device provided in this embodiment of the invention has the same implementation principle and technical effect as the aforementioned method embodiment. For the sake of brevity, any parts not mentioned in the device embodiment can be referred to the corresponding content in the aforementioned method embodiment.

[0102] This invention also provides a gasoline injection engine that performs the gasoline injection engine fuel jet landing point development method in any of the above embodiments.

[0103] The gasoline injection engine provided in this embodiment of the invention performs the gasoline injection engine fuel jet landing point development method in the above embodiments. Therefore, the gasoline injection engine provided in this embodiment of the invention also has the beneficial effects described in the above embodiments, which will not be repeated here.

[0104] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0105] Finally, it should be noted that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for developing the fuel jet landing point of a gasoline injection engine, characterized in that, The method includes: When the distance from the injection point to the wall of the fuel jet cone meets the preset distance range, the fuel jet injection path parameters are set; the setting of the fuel jet injection path parameters includes: setting the fuel jet injection direction and the fuel jet injection cone angle; Based on the fuel injection path parameters, determine whether the fuel jet injection distance parameter in the intake manifold meets the preset parameter value; If the conditions are not met, the injection path parameters of the fuel jet are adjusted based on the injection distance parameters; If satisfied, then determine whether the amount of oil jet hitting the wall when the valve of the intake manifold is open meets the first proportion threshold and whether the amount of fuel evaporation when the valve of the intake manifold is closed meets the second proportion threshold. If all conditions are met, the development of the fuel jet landing point for the gasoline injection engine is completed, and the fuel injection of the gasoline injection engine is controlled by the aforementioned fuel injection path parameters; Determining whether the fuel jet injection distance parameter in the intake manifold meets the preset parameter value based on the fuel injection path parameters includes: Based on the fuel injection path parameters, determine whether the first distance between the fuel jet at the fuel injection port and the inner wall of the intake manifold is greater than or equal to a first distance threshold. If the first distance is greater than or equal to the first distance threshold, then determine whether the second distance between the contact surface of the oil jet on the intake valve and the seat cover in the exhaust direction is greater than or equal to the second distance threshold.

2. The method for developing the fuel jet landing point of a gasoline injection engine according to claim 1, characterized in that, If the first distance is less than the first distance threshold, then adjusting the injection path parameters of the fuel jet based on the injection distance parameters includes: The fuel injection path parameters of the fuel jet are adjusted based on the difference between the first distance and the first distance threshold.

3. The method for developing the fuel jet landing point of a gasoline injection engine according to claim 1, characterized in that, If the second distance is less than the second distance threshold, then adjusting the injection path parameters of the fuel jet based on the injection distance parameters includes: The fuel injection path parameters of the fuel jet are adjusted based on the difference between the second distance and the second distance threshold.

4. The method for developing the fuel jet landing point of a gasoline injection engine according to claim 1, characterized in that, Before determining whether the amount of fuel jet impacting the intake manifold wall when the intake manifold valve is open meets a first proportion threshold and whether the amount of fuel evaporation when the intake manifold valve is closed meets a second proportion threshold, the method further includes: Based on the injection path parameters, hydrodynamic calculations are performed on the open-valve injection and closed-valve injection of the intake manifold to obtain the amount of fuel jet impacting the wall when the intake manifold is open and the amount of fuel evaporation when the intake manifold is closed.

5. The method for developing the fuel jet landing point of a gasoline injection engine according to claim 1, characterized in that, Before setting the injection path parameters of the oil jet, the method further includes: Set the initial coordinates of the fuel injection point; Determine whether the third distance from the injection point to the oil jet cone impact wall meets the preset distance range; If the conditions are met, then the action of setting the injection path parameters of the oil jet is performed; If the conditions are not met, the initial coordinates will be corrected.

6. The method for developing the fuel jet landing point of a gasoline injection engine according to claim 5, characterized in that, The method further includes: If the amount of oil jet impacting the wall when the valve is opened does not meet the first proportion threshold, or if the amount of fuel evaporation when the valve is closed does not meet the second proportion threshold, then the initial coordinates are corrected.

7. An apparatus for developing the fuel jet landing point of a gasoline injection engine, used to perform the method for developing the fuel jet landing point of a gasoline injection engine according to any one of claims 1-6, characterized in that, The device includes: The parameter setting unit is used to set the injection path parameters of the oil jet when the distance from the injection point to the oil jet cone surface hitting the wall meets the preset distance range. The first parameter determination unit is used to determine whether the injection distance parameter of the fuel jet in the intake manifold meets the preset parameter value based on the fuel injection path parameter. A parameter correction unit is used to adjust the fuel injection path parameters of the fuel jet based on the injection distance parameters if the judgment result of the first parameter judgment unit is not satisfied. The second parameter judgment unit is used to determine whether the amount of oil jet hitting the wall when the oil jet is open in the intake manifold meets the first proportion threshold and whether the amount of fuel evaporation when the oil jet is closed in the intake manifold meets the second proportion threshold if the judgment result of the first parameter judgment unit is satisfied. The fuel injection control unit is used to complete the development of the fuel jet landing point of the gasoline injection engine if the judgment result of the second parameter judgment unit is satisfied, and to control the fuel injection of the gasoline injection engine with the fuel injection path parameters.

8. A gasoline injection engine, characterized in that, The gasoline injection engine implements the gasoline injection engine fuel jet landing point development method according to any one of claims 1-6.

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