A method, device, equipment and medium for calculating the degree of fit of plunger pairs of internal combustion engines

Abstract

The present invention discloses a method, device, equipment and medium for calculating the degree of fit of a plunger pair of an internal combustion engine, and belongs to the technical field of data processing of specific functions. The method for calculating the degree of fit of a plunger pair of an internal combustion engine comprises: calculating the deformation amount Gi of the fitting clearance of the plunger pair of the first, second, ..., i, ..., and M plunger pair of oil inlet, oil supply, and oil return working cycles, and calculating the degree of fit of the plunger pair of the first, second, ..., i, ..., and M plunger pair of oil inlet, oil supply, and oil return working cycles Gd1, Gd2, ..., Gdi ..., GdM according to the design fitting clearance G of the plunger pair. The present invention can calculate and determine the degree of fit of the plunger pair of an internal combustion engine, and reduce the risk of leakage or jamming of the plunger pair.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing of specific functions, and more specifically, to a method, device, equipment and medium for calculating the degree of fit of a plunger pair of an internal combustion engine. Background Art

[0002] The combustion process and overall performance of an internal combustion engine are largely limited by the fuel supply system, which usually includes fuel injectors, fuel pipes, etc. In order to meet the requirements of existing carbon emissions and ecological environmental protection policies, internal combustion engines usually use combustion optimization technology to increase the injection pressure of fuel through the injector, thereby achieving full mixing and combustion of fuel and air in the combustion chamber.

[0003] The plunger pair is one of the most important and precise parts in the injector. The plunger pair usually includes a plunger sleeve and a plunger. The fitting clearance of the plunger pair (i.e., the fitting clearance between the plunger sleeve and the plunger) is usually at the micron level. The increase in the injection pressure of the injector will greatly affect the fitting clearance of the plunger pair, resulting in leakage or jamming of the plunger pair. That is, if the fitting clearance of the plunger pair is too large, fuel pressure reduction leakage will occur. If the deformation of the fitting clearance of the plunger pair is too small, the plunger will be jammed in the plunger sleeve, which will affect the normal operation of the internal combustion engine fuel supply system and affect the use of the combustion optimization technology of the internal combustion engine. Therefore, in the combustion optimization technology of the internal combustion engine, on the basis of the fitting clearance of the plunger pair, it is necessary to further study the fitting degree of the plunger pair of the internal combustion engine. How to calculate and determine the fitting degree of the plunger pair of the internal combustion engine and control the fitting degree of the plunger pair of the internal combustion engine are important technical issues in the combustion optimization technology of the internal combustion engine. Summary of the invention

[0004] Based on this, the present invention provides a method, device, equipment and medium for calculating the degree of fit of a plunger pair of an internal combustion engine, aiming to partially or completely solve the above technical problems. The present invention is achieved through the following technical solutions:

[0005] In the first aspect, the present invention provides a method for calculating the degree of fit of a plunger pair of an internal combustion engine, wherein the plunger pair comprises a plunger sleeve, a plunger and a fastener, wherein the plunger sleeve is provided with an oil inlet and return hole and a plunger cavity, and the fastener is pre-fastened and connected to the plunger sleeve, comprising the following steps:

[0006] S100, obtaining the tightening torque N when the fastener is pre-tightened to connect the plunger sleeve, the design matching clearance of the plunger pair, the diameter of the oil inlet and return holes of the plunger sleeve and the length of the oil inlet and return holes; obtaining the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the oil inlet pressure P1, P2, ..., Pi..., PM, and the oil density E1, E2, ..., Ei, ..., EM in the M-th plunger pair oil inlet, oil supply and oil return working cycle;

[0007] S200, calculating the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M of the first plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle;

[0008] S300, calculating the piston pair fitting clearance deformation amounts G1, G2, ..., Gi..., GM of the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., and the M-th piston pair oil inlet, oil supply and oil return working cycle according to the first fitting clearance deformation amounts G11, G12, ..., G1i..., G1M, the second fitting clearance deformation amounts G21, G22, ..., G2i..., G2M and the third fitting clearance deformation amounts G31, G32, ..., G3i..., G3M;

[0009] S400, according to the design matching clearance G of the plunger pair, the matching degrees Gd1, Gd2, ..., Gdi, ..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle are calculated. The matching degrees Gdi, GdM of the plunger pair are respectively:

[0010] Gdi=1-Gi / G, GdM=1-GM / G;

[0011] i=1,2,...,M-1; M is the total number of working cycles of the plunger pair for oil inlet, oil supply and oil return.

[0012] Optionally, the first fitting clearance deformation G1i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the first fitting clearance deformation G1M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle; the second fitting clearance deformation G2i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the second fitting clearance deformation G2M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle; the third fitting clearance deformation G3i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the third fitting clearance deformation G3M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle are respectively:

[0013] G1i=P11*N+P12*Pi, G1M=P11*N+P12*PM;

[0014] G2i=P2i*D+P2 / L, G2M=P2M*D+P2 / L;

[0015] G3i=P3*G*Ei / E, G3M=P3*G*EM / E;

[0016] Among them, N is the tightening torque, P11 is the first clearance adjustment coefficient one, P12 is the first clearance adjustment coefficient two; D is the diameter of the oil inlet and return holes, L is the length of the oil inlet and return holes, P2i is the second clearance adjustment coefficient one of the i-th plunger pair's oil inlet, oil supply and oil return working cycle, P2 is the second clearance adjustment coefficient two, P2M is the second clearance adjustment coefficient; E is the original oil inlet density, and P3 is the third clearance adjustment coefficient.

[0017] Optionally, the piston pair fitting clearance deformation Gi includes: a first fitting clearance deformation G1i, a second fitting clearance deformation G2i and a third fitting clearance deformation G3i, and the piston pair fitting clearance deformation Gi and GM are respectively;

[0018] Gi=λ1G1i+λ2G2i+λ3G3i+ηiGi-1

[0019] GM=λ1G1M+λ2G2M+λ3G2M+ηMGM-1

[0020] Among them, i=1,2,...,M-1, λ1, λ2, λ3 are constants, ηi is the adjustment coefficient of the fit clearance deformation of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, ηM is the adjustment coefficient of the fit clearance deformation of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle, η1=0, G0=0.

[0021] Optionally, step S400 also includes step S500: obtaining the maximum value Gdmax and the minimum value Gdmin of the plunger pair fit, Gdmax=Max[Gd1, Gd2, ..., Gdi..., GdM], Gdmin=Min[Gd1, Gd2, ..., Gdi..., GdM], and judging the risk of the plunger pair fit based on the judgment conditions.

[0022] Optionally, in step S500, judging the risk of the plunger assembly matching in combination with the judging conditions includes:

[0023] When Gdmax≥0.95, it indicates that there is a risk in the matching relationship between the plunger and the piston.

[0024] When Gdmin≤0.2, it indicates that there is a risk in the matching relationship of the plunger and piston.

[0025] In a second aspect, the present invention provides a device for calculating the degree of fit of a plunger pair of an internal combustion engine, which implements the method for calculating the degree of fit of a plunger pair of an internal combustion engine as described in any one of the first aspects, including: an acquisition unit, a processor and a storage unit, wherein the processor includes a first calculation unit, a second calculation unit and a third calculation unit;

[0026] An acquisition unit is provided to acquire the tightening torque N when the fastener is pre-tightened to connect the plunger sleeve, the design matching clearance G of the plunger pair, the diameter D of the oil inlet and return holes of the plunger sleeve, and the length L of the oil inlet and return holes; the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the oil inlet pressure P1, P2, ..., Pi..., PM, the oil density E1, E2, ..., Ei, ..., EM of the oil inlet, oil supply and oil return working cycle of the M-th plunger pair are acquired, and sent to the processor;

[0027] The first calculation unit calculates the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M of the first plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle, and sends them to the second calculation unit;

[0028] The second calculation unit calculates the piston pair fitting clearance deformation G1, G2, ..., Gi..., GM of the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., and the M-th piston pair oil inlet, oil supply and oil return working cycle according to the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M, and sends them to the third calculation unit;

[0029] The third calculation unit calculates the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle according to the plunger pair design matching clearance G, and sends them to the storage unit. The plunger pair matching degrees Gdi and GdM are respectively:

[0030] Gdi=1-Gi / G, GdM=1-GM / G;

[0031] i=1,2,...,M-1; M is the total number of oil inlet, oil supply and oil return working cycles of the plunger pair;

[0032] A storage unit stores the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., and the M-th plunger pair oil inlet, oil supply and oil return working cycle.

[0033] Optionally, the piston pair fitting clearance deformation Gi includes: a first fitting clearance deformation G1i, a second fitting clearance deformation G2i and a third fitting clearance deformation G3i, and the piston pair fitting clearance deformation Gi and GM are respectively;

[0034] Gi=λ1G1i+λ2G2i+λ3G2i

[0035] GM=λ1G1M+λ2G2M+λ3G2M

[0036] Among them, i=1,2,...,M-1, λ1, λ2, λ3 are constants, ηi is the adjustment coefficient of the fit clearance deformation of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, ηM is the adjustment coefficient of the fit clearance deformation of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle, η1=0, G0=0.

[0037] Optionally, the internal combustion engine plunger pair matching degree calculation device further includes: a display unit, and the processor further obtains a maximum value Gdmax of the plunger pair matching degree and a minimum value Gdmin of the plunger pair matching degree;

[0038] Gdmax=Max[Gd1, Gd2,...,Gdi...,GdM];

[0039] Gdmin=Min[Gd1, Gd2,...,Gdi...,GdM];

[0040] When Gdmax≥0.95, the processor sends an instruction to the display unit, and the display unit prompts that there is a risk in the matching relationship of the plunger and the pair;

[0041] When Gdmin≤0.2, the processor sends an instruction to the display unit, and the display unit prompts that there is a risk in the matching relationship of the plunger pair.

[0042] In a third aspect, the present invention application provides a device for calculating the degree of fit of a plunger pair of an internal combustion engine, the device comprising a processor, a memory, and a calculation program stored in the memory and executable by the processor, wherein when the calculation program is executed by the processor, the steps of the method for calculating the degree of fit of a plunger pair of an internal combustion engine as described in any one of the first aspects are implemented.

[0043] In a fourth aspect, the present invention application provides a computer-readable storage medium having a calculation program stored thereon, wherein when the calculation program is executed by a processor, the steps of the method for calculating the degree of fit of an internal combustion engine plunger pair as described in any one of the first aspects are implemented.

[0044] In summary, the beneficial technical effects of the present invention are:

[0045] (1) In the present invention, it is proposed that the piston-pump pair clearance deformation Gi includes the first clearance deformation Gi, the second clearance deformation Gi and the third clearance deformation Gi, and the mathematical relationship between the first clearance deformation Gi and the tightening torque N and the oil inlet pressure P, the mathematical relationship between the second clearance deformation Gi and the oil inlet and return hole diameter D and the oil inlet and return hole length L, and the mathematical relationship between the third clearance deformation Gi and the oil density Ei are analyzed and established. The mathematical relationship between the piston-pump pair clearance deformation Gi and the first clearance deformation Gi, the second clearance deformation Gi and the third clearance deformation Gi is established. This enables the piston-pump pair clearance deformation Gi to be roughly calculated even after processing the tightening torque N, the oil inlet pressure P, the oil inlet and return hole diameter D, the oil inlet and return hole length L and the oil density Ei under the actual working condition of the internal combustion engine, thereby solving the technical problem of determining the fitting condition of the piston-pump pair of the internal combustion engine.

[0046] (2) In the present invention application, it is proposed to use the plunger pair fitting degree Gdi to evaluate the actual fitting performance of the plunger pair, and the relationship between the actual fitting clearance deformation of the plunger pair and the designed fitting clearance deformation G of the plunger pair is established. The fitting condition of the plunger pair is judged by the numerical value of Gdi, thereby helping the actual operator of the internal combustion engine to understand the working condition of the plunger pair. The fitting risk of the plunger pair can also be judged based on the judgment conditions. When Gdmax≥1.05 or when Gdmin≤0.2, it is displayed to prompt that there is a risk in the fitting relationship of the plunger pair, thereby solving the technical problem of reducing the risk of oil leakage or jamming of the plunger pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the structure of the plunger pair of the present invention. Figure 1 ;

[0048] Figure 2 This is a schematic diagram of the structure of the plunger pair of the present invention. Figure 2 ;

[0049] Figure 3 It is a schematic diagram of a method for calculating the degree of fit of a plunger pair of an internal combustion engine applied by the present invention;

[0050] Figure 4 It is a schematic diagram of a device for calculating the degree of fit of a plunger pair of an internal combustion engine applied by the present invention;

[0051] Figure 5 It is a schematic diagram of another internal combustion engine plunger matching degree calculation device applied by the present invention;

[0052] Description of the drawings: plunger sleeve 100, plunger 200, oil inlet and return holes 101, plunger cavity 102, step opening 103. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure more clear, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and embodiments; it should be understood that the specific embodiments described herein are only used to explain the embodiments of the present disclosure and are not used to limit the embodiments of the present disclosure;

[0054] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any structural modification, change in proportion relationship or adjustment in size, without affecting the effects and purposes that can be produced by the present invention, should still fall within the scope of the technical contents disclosed by the present invention; at the same time, the terms such as "and" and "or" quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the present invention without substantially changing the technical contents; in addition, the various embodiments of the present invention are not independent of each other, but can be combined;

[0055] The terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features; thus, the features defined as "first", "second" and "third" may explicitly or implicitly include one or more of the features, and in the description of the present application, unless otherwise specified, "multiple" means two or more.

[0056] In the existing field of internal combustion engine combustion technology, plunger pairs are an indispensable set of parts used to complete the functions of oil intake, oil supply and oil return. The plunger pair usually works as follows: first, the hollow bolt is pressed against the plunger sleeve with a certain tightening torque. The pressure of the hollow bolt on the upper surface of the plunger sleeve causes oil to enter the oil inlet and return holes of the plunger sleeve, so that the plunger cavity on the upper part of the plunger is filled with fuel; then, the plunger moves upward in the plunger sleeve as the cam rotates. The action of the cam increases the fuel pressure in the plunger cavity, and the plunger squeezes the fuel in the plunger cavity upward. When the fuel pressure rises to a certain threshold, the oil outlet valve in the hollow bolt is squeezed open, and the fuel enters the pipeline and reaches the injector. The injector will High-pressure fuel is sprayed into the combustion chamber of the internal combustion engine, thereby achieving full combustion and energy conversion of the internal combustion engine fuel; finally, the spiral groove on the plunger is connected to the oil inlet and return holes on the plunger sleeve, the pressure in the plunger cavity is reduced, and the plunger return oil pressure relief is a dynamic process. The oil outlet valve is closed and no longer supplies oil to the injector, thereby ending the entire process of oil inlet, oil supply and oil return. These are technical knowledge of ordinary technicians in the existing internal combustion engine combustion technology. It should be noted that the above technical knowledge may not constitute the prior art content before the filing date of the present application.

[0057] First, as Figure 1-3 As shown, the present invention provides a method for calculating the degree of fit of a plunger pair of an internal combustion engine, wherein the plunger pair comprises a plunger sleeve 100, a plunger 200 and a fastener 300, wherein the plunger sleeve 100 is provided with an oil inlet and return hole 101, a plunger cavity 102 and a step opening 103, and the fastener 300 is pre-fastened and connected to the plunger sleeve 100, and the method comprises the following steps:

[0058] S100, obtaining the tightening torque N when the fastener 300 is pre-tightened to connect the plunger sleeve 100, the design matching clearance G of the plunger pair, the diameter D of the oil inlet and return holes and the length L of the oil inlet and return holes of the plunger sleeve 100; obtaining the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the oil inlet pressure P1, P2, ..., Pi..., PM, and the oil density E1, E2, ..., Ei, ..., EM in the M-th plunger pair oil inlet, oil supply and oil return working cycle;

[0059] In some embodiments, the plunger pair includes: a plunger sleeve 100, a plunger 200 and a fastener 300. The plunger sleeve 100 is provided with an oil inlet and return hole 101, a plunger cavity 102 and a step 103. The plunger 200 moves up and down relative to the plunger sleeve 100. The fastener 300 is usually pre-tightened and connected to the plunger sleeve 100 with a certain tightening torque N. Accordingly, the tightening torque N when the fastener 300 is pre-tightened and connected to the plunger sleeve 100, the oil inlet and return hole diameter D and the oil inlet and return hole length L of the plunger sleeve 100 can usually be obtained in advance through the plunger pair drawings or process data that have been completed in design, manufacturing and assembly. For example, the tightening torque N is usually pre-set, and the tightening torque N can range from 10-150N˙m, for example, the tightening torque N is 25N˙M, 55N˙M, 80N˙M or 100N˙M or 150N˙M, etc. The diameter D of the oil inlet and return hole of the plunger sleeve 100 ranges from 3-15mm, for example, the diameter D of the oil inlet and return hole can be 7.5mm, and the length L of the oil inlet and return hole of the plunger sleeve 100 ranges from 3-15mm, for example, the length L of the oil inlet and return hole is 5.5mm, etc.

[0060] In some embodiments, the method for calculating the degree of fit of the piston pair of an internal combustion engine includes: the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., the M-th piston pair oil inlet, oil supply and oil return working cycle, i=1,2,...,M-1; M is the total number of piston pair oil inlet, oil supply and oil return working cycles. Obviously, the piston pair usually works in multiple piston pair oil inlet, oil supply and oil return working cycles, and the piston pair fitting clearance deformation of the previous piston pair oil inlet, oil supply and oil return working cycle may affect the piston pair fitting clearance deformation of the current piston pair oil inlet, oil supply and oil return working cycle, thereby affecting the quality of the fitting relationship of the piston pair of the internal combustion engine. Therefore, the present invention application takes the oil inlet, oil supply and oil return working cycles of the plunger pair into consideration, and can accordingly obtain the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle.

[0061] S200, calculating the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M of the first plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle;

[0062] In some embodiments, for the plunger sleeve 100, at the step 103 of the plunger sleeve 100, as the oil inlet pressure P increases, the squeezing effect of the oil pressure P on the inner surface of the plunger sleeve 100 and the squeezing effect of the tightening torque N on the upper surface of the plunger sleeve 100 (such as the force F) at least partially offset each other, thereby causing the expansion deformation near the step 103 of the plunger sleeve 200 to be weakened; for the plunger 200, under the action of the internal oil pressure, as the oil inlet pressure P increases, the expansion deformation of the head of the plunger 200 is strengthened. Therefore, the tightening torque N and the oil inlet pressure P will affect the matching clearance of the plunger pair, and the first matching clearance deformation amount G1i is set accordingly. In the actual process, after the oil inlet pressure P is increased, the expansion deformation near the step 103 of the plunger sleeve 200 is greatly weakened, and the expansion deformation of the head of the plunger 200 is greatly enhanced. The first fit clearance deformation G1i will be highly correlated with the expansion deformation of the head of the plunger 200. The corresponding first fit clearance deformation G1i and the tightening torque N and the oil inlet pressure P can form a simple mathematical relationship. The first fit clearance deformation G1i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle and the first fit clearance deformation G1M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle are respectively:

[0063] G1i=P11*N+P12*Pi; G1M=P11*N+P12*PM.

[0064] Among them, N is the tightening torque, P11 is the first clearance adjustment coefficient one, P12 is the first clearance adjustment coefficient two, P11 and P12 can be obtained according to human experience or simulation of the clearance structure of the plunger pair, P11 and P12 can be positive or negative values, for example, P11 is a constant value between 0-2, P11 is a constant value between 0-3, illustratively, P11 is 0.58, 0.83, etc., and P12 is 0.79, 0.46, etc.

[0065] In some embodiments, for the plunger pair, during the oil return pressure relief process, the oil inlet and return hole 102 will be connected to the plunger cavity 102 of the plunger sleeve 100 through the plunger spiral groove, and the plunger spiral groove will be injected into other parts of the injector through the oil inlet and return hole. The corresponding diameter D of the oil inlet and return hole 103 and the length L of the oil inlet and return hole 103 will directly affect the impact of the return oil on the plunger pair. Generally speaking, the larger the length L of the oil inlet and return hole 103, the smaller the impact of the oil return pressure relief process on the plunger and the like, and the smaller the impact on the fitting clearance of the plunger and the like; the smaller the length L of the oil inlet and return hole 103, the greater the impact of the oil return pressure relief process on the plunger and the like, and the greater the impact on the fitting clearance of the plunger and the like; at the same time, in the oil return pressure relief process, the larger the oil inlet and return hole diameter D of the oil inlet and return hole 103, the greater the impact of the oil return pressure relief process on the plunger and the like, and the greater the impact on the deformation of the fitting clearance of the plunger and the like; the smaller the oil inlet and return hole diameter D of the oil inlet and return hole 103, the smaller the impact of the oil return pressure relief process on the plunger and the like, and the smaller the impact on the deformation of the fitting clearance of the plunger and the like. Therefore, the diameter D of the oil inlet and return hole 103 and the length L of the oil inlet and return hole 103 will affect the fitting clearance of the plunger and the like, and the second fitting clearance deformation G2i is set accordingly.

[0066] In some embodiments, generally speaking, it can be considered that the deformation amount of the clearance between the plunger and the pair is inversely correlated with the length L of the oil inlet and return hole, and is positively correlated with the diameter D of the oil inlet and return hole 102. The second deformation amount of the clearance between the plunger and the pair can form a mathematical relationship with the diameter D of the oil inlet and return hole 103 and the length L of the oil inlet and return hole 103. The second deformation amount of the clearance between the plunger and the pair in the oil inlet, oil supply and oil return working cycle G2i and the second deformation amount of the clearance between the plunger and the pair in the oil inlet, oil supply and oil return working cycle G2M are respectively:

[0067] G2i=P2i*D+P2 / L, G2M=P2M*D+P2 / L.

[0068] Among them, D is the diameter of the oil inlet and return holes, L is the length of the oil inlet and return holes, P2i is the second clearance adjustment coefficient one of the i-th plunger pair's oil inlet, supply and return working cycle, P2 is the second clearance adjustment coefficient two, P2M is the second clearance adjustment coefficient, P2i, P2, and P2M can be obtained based on human experience or simulation of the clearance structure of the plunger pair, the value of P2i comes from a certain numerical range, P2 and P2M can both be positive or negative values, for example, the numerical range of P2i is between -1 and 1 (i=1,2,..., M-1, understood to include this number), P2 is a constant value between 0-3, and P2M is a constant value between 0-1. For example, P2M is 1.0, 1.3, etc., and P2M is 0.5, 0.6, etc.

[0069] In the present application, it should be noted that in the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle, the tightening torque N, the diameter D of the oil inlet and return hole 103 and the length L of the oil inlet and return hole 103 are usually pre-set, and the oil inlet pressure P usually fluctuates around the set pressure value, and the corresponding second fitting clearance deformation G2i may also fluctuate to a certain extent, so a second clearance adjustment coefficient P2i is set, and the second clearance adjustment coefficient P2i is set. The integral coefficient P2i can adapt to the needs of changes in the second fitting clearance deformation G2i of different plunger pair oil inlet, oil supply and oil return working cycles. Accordingly, the second clearance adjustment coefficients P21, P22..., P2i,..., P2M-1 of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle,..., the i-th plunger pair oil inlet, oil supply and oil return working cycle,..., the M-th plunger pair oil inlet, oil supply and oil return working cycle can all be obtained based on human experience or simulation of the plunger pair fitting clearance structure, and the value of P2i can be taken from a certain numerical range.

[0070] In some embodiments, after the plunger pair has worked for a long time, there will be cavitation on the plunger, that is, the plunger head may have local surface discoloration or local sintering or local pitting of inconsistent size, and even pits in some areas. The cavitation phenomenon may cause air or water to mix into the oil, and the presence of these impurities may change the density of the oil; the cavitation phenomenon may also cause the oil to overheat and affect the density of the oil; after the cavitation phenomenon occurs, the density of the oil may change due to the increase of impurities and temperature changes. Therefore, the cavitation phenomenon will cause damage to the plunger surface, and the oil density will further change the deformation of the fitting clearance of the plunger pair. The third fitting clearance deformation G3i is set accordingly. The third fitting clearance deformation G3i and the oil density Ei can form a corresponding mathematical relationship together. The third fitting clearance deformation G3i of the i-th plunger pair's oil inlet, oil supply and oil return working cycle and the third fitting clearance deformation G3M of the M-th plunger pair's oil inlet, oil supply and oil return working cycle are respectively:

[0071] G3i=P3*G*Ei / E, G3M=P3*G*EM / E.

[0072] Among them, E is the original oil density, P3 is the third clearance adjustment coefficient, P3 can be obtained based on human experience or simulation of the clearance structure of the plunger pair, and P3 can be a positive or negative value. For example, P3 is a constant value between 0-5, and P3 is 1.0, 0.95, etc.

[0073] S300, calculating the piston pair fitting clearance deformation amounts G1, G2, ..., Gi..., GM of the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., and the M-th piston pair oil inlet, oil supply and oil return working cycle according to the first fitting clearance deformation amounts G11, G12, ..., G1i..., G1M, the second fitting clearance deformation amounts G21, G22, ..., G2i..., G2M and the third fitting clearance deformation amounts G31, G32, ..., G3i..., G3M;

[0074] In some embodiments, during the i-1th oil inlet, oil supply and oil return working cycle of the plunger pair, during the i-1th oil inlet, oil supply and oil return working cycle of the plunger pair, before oil inlet, the pressure of the hollow bolt acting on the upper surface of the plunger sleeve causes the plunger sleeve to deform and thereby changes the deformation of the fitting clearance between the plunger sleeve and the plunger. During the oil inlet and oil supply process, the oil inlet pressure P acts on the plunger sleeve and the plunger, causing the plunger sleeve and the plunger to deform and thereby change the deformation of the fitting clearance between the plunger sleeve and the plunger. During the oil return process, the return oil acts on the plunger sleeve to deform and thereby changes the deformation of the fitting clearance between the plunger sleeve and the plunger. After the i-1th oil inlet, oil supply and oil return working cycle of the plunger pair is completed, the i-th oil inlet, oil supply and oil return working cycle of the plunger pair begins. In the i-th oil inlet, oil supply and oil return working cycle of the plunger pair, the hollow bolt will still act on the pressure on the upper surface of the plunger sleeve, causing the plunger sleeve to deform and thus changing the deformation of the fitting clearance between the plunger sleeve and the plunger. During the oil inlet and oil supply process, the oil inlet pressure P will still act on the plunger sleeve and the plunger again, causing the plunger sleeve and the plunger to deform and thus change the deformation of the fitting clearance between the plunger sleeve and the plunger; during the oil return process, the return oil will also act on the plunger sleeve to deform and thus change the deformation of the fitting clearance between the plunger sleeve and the plunger. In this way, after a long period of multiple oil inlet, oil supply and oil return working cycles of the plunger pair, there will be cavitation on the plunger, causing the deformation Gi of the fitting clearance of the plunger pair to change.

[0075] Optionally, the plunger pair fitting clearance deformation Gi includes: a first fitting clearance deformation Gi, a second fitting clearance deformation Gi and a third fitting clearance deformation Gi, and the plunger pair fitting clearance deformation Gi is;

[0076] Gi=λ1G1i+λ2G2i+λ3G3i+ηiGi-1

[0077] GM=λ1G1M+λ2G2M+λ3G2M+ηMGM-1

[0078] Among them, i=1,2,...,M-1, λ1, λ2, λ3 are constants, ηi is the adjustment coefficient of the fit clearance deformation of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, ηM is the adjustment coefficient of the fit clearance deformation of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle, η1=0, G0=0.

[0079] In some embodiments, the piston pair fitting clearance deformation Gi includes: a first fitting clearance deformation G1i, a second fitting clearance deformation G2i and a third fitting clearance deformation G3i, the first fitting clearance deformation G1i can be a positive value or a negative value, the second fitting clearance deformation G2i can be a positive value or a negative value, and the third fitting clearance deformation G3i can be a positive value or a negative value. Based on the first fitting clearance deformation G1i, the second fitting clearance deformation G2i, the third fitting clearance deformation G3i and the last fitting clearance deformation Gi-1, the piston pair fitting clearance deformation Gi can be calculated. It should be noted that, during the first oil inlet, oil supply and oil return working cycle of the plunger pair, the previous plunger pair fit clearance deformation does not exist, and G0 can be set to 0 accordingly. The calculation of the plunger pair fit clearance deformation G1 only needs to consider the first fit clearance deformation G11, the second fit clearance deformation G21 and the third fit clearance deformation G31, G1=λ1G11+λ2G21+λ3G31, λ1, λ2, λ3 can also be obtained based on human experience or simulation of the plunger pair fit clearance structure.

[0080] In some embodiments, in the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle, the calculation of the plunger pair fit clearance deformation Gi needs to consider the first fit clearance deformation G1i, the second fit clearance deformation G2i, the third fit clearance deformation G3i and the previous plunger pair fit clearance deformation Gi-1, so that the calculation of the plunger pair fit clearance deformation Gi is not only based on the first fit clearance deformation G1i, the second fit clearance deformation G2i, the third fit clearance deformation G3i and the previous plunger pair fit clearance deformation Gi-1. G3i, can also consider the influence of the piston pair clearance deformation Gi-1 of the previous piston pair oil inlet, oil supply and oil return working cycle, and set the clearance deformation adjustment coefficient ηi, correspondingly, the 1st piston pair oil inlet, oil supply and oil return working cycle, the 2nd piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., the M-th piston pair oil inlet, oil supply and oil return working cycle η1, η2..., ηi, ..., ηM can all be obtained based on human experience or simulation of the piston pair clearance structure, and the value of ηi can be taken from a certain range of values. Of course, it should be noted that η1=0, G0=0.

[0081] S400, according to the design matching clearance G of the plunger pair, the matching degrees Gd1, Gd2, ..., Gdi, ..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle are calculated. The matching degrees Gdi, GdM of the plunger pair are respectively:

[0082] Gdi=1-Gi / G, GdM=1-GM / G;

[0083] i=1,2,...,M-1; M is the total number of working cycles of the plunger pair for oil inlet, oil supply and oil return.

[0084] In some embodiments, in order to evaluate the relationship between the actual fitting clearance deformation of the plunger pair and the designed fitting clearance deformation G of the plunger pair, the present application proposes a plunger pair fitting degree to evaluate the actual fitting performance of the plunger pair, and the corresponding plunger pair fitting degree Gdi=Gi / G. Obviously, for example, when Gdi≤0, it indicates that the actual fit clearance deformation of the plunger couple is equal to the design fit clearance deformation G of the plunger couple or the actual fit clearance deformation of the plunger couple is greater than the design fit clearance deformation G of the plunger couple, that is, the actual fit clearance deformation of the plunger couple is close to the design fit clearance deformation G of the plunger couple or the actual fit clearance deformation of the plunger couple is greater than the design fit clearance deformation G of the plunger couple, and the corresponding plunger couple actually has a high risk of getting stuck or the plunger couple has actually gotten stuck; when Gdi>0, it indicates that the actual fit clearance deformation of the plunger couple is less than the design fit clearance deformation G of the plunger couple, that is, there is a gap difference between the actual fit clearance deformation of the plunger couple and the design fit clearance deformation G of the plunger couple, and the corresponding plunger couple does not actually get stuck, but the plunger couple may have an oil leakage risk.

[0085] In the present application, firstly, it is proposed that the piston-pump coupling clearance Gi includes the first clearance deformation G1i, the second clearance deformation G2i and the third clearance deformation G3i, and the mathematical relationship between the first clearance deformation G1i and the tightening torque N and the oil inlet pressure P, the mathematical relationship between the second clearance deformation G2i and the oil inlet and return hole 103 diameter D and the oil inlet and return hole 103 length L, the mathematical relationship between the third clearance deformation G3i and the oil density Ei is analyzed and established, and the piston-pump coupling clearance Gi and the first clearance deformation G1i, the second clearance deformation G2i and the third clearance deformation G3i are completed. The mathematical relationship between the deformation of the matching clearance G3i enables the data such as tightening torque N, oil inlet pressure P, oil inlet and return hole diameter D, oil inlet and return hole length L and oil density Ei to be processed to determine the matching of the plunger and piston parts when the actual internal combustion engine is working; in addition, it is proposed to use the matching degree Gdi of the plunger and piston parts to evaluate the actual matching performance of the plunger and piston parts, and complete the establishment of the relationship between the actual matching clearance deformation of the plunger and piston parts and the designed matching clearance deformation G of the plunger and piston parts. The matching of the plunger and piston parts is judged by the numerical value of Gdi, thereby helping the actual operators of the internal combustion engine to master the working conditions of the plunger and piston parts. In addition, the matching clearance structure simulation of the plunger and piston parts can be carried out through conventional ANSYS, Fluent software, etc., which belongs to the technical content that technicians in the general technical field can fully obtain.

[0086] Optionally, step S400 also includes step S500: obtaining the maximum value Gdmax and the minimum value Gdmin of the plunger pair fit; Gdmax=Max[Gd1, Gd2, ..., Gdi..., GdM], Gdmin=Min[Gd1, Gd2, ..., Gdi..., GdM], and judging the risk of the plunger pair fit based on the judgment conditions.

[0087] In some embodiments, after calculating the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle, the maximum value of the plunger pair matching degree Gdmax=Max[Gd1, Gd2, ..., Gdi..., GdM] and the minimum value of the plunger pair matching degree Gdmin=Min[Gd1, Gd2, ..., Gdi..., GdM] can be obtained. Obviously, according to the maximum value Gdmax and the minimum value Gdmin of the plunger pair matching degree, combined with the judgment conditions, the matching condition of the plunger pair can be judged, thereby helping the actual operator of the internal combustion engine to grasp the working condition of the plunger pair.

[0088] Optionally, in step S500, judging the risk of the plunger pair fitting in combination with the judging conditions includes: when Gdmax≥0.95, prompting that there is a risk in the fitting relationship of the plunger pair; when Gdmin≤0.2, prompting that there is a risk in the fitting relationship of the plunger pair.

[0089] In some embodiments, when Gdmax≥0.95, it indicates that the actual fitting clearance deformation of the plunger couple has reached up to 5% of the designed fitting clearance G of the plunger couple, that is, the actual fitting clearance of the plunger couple may have a trend of being larger than the designed fitting clearance of the plunger couple, and the corresponding plunger couple actually has a high risk of oil leakage, which will indicate that there is a risk in the fitting relationship of the plunger couple, thereby solving the technical problem of reducing the risk of oil leakage of the plunger couple; when Gdmin≤0.2, it indicates that the actual fitting clearance deformation of the plunger couple has reached 80% of the designed fitting clearance deformation G of the plunger couple, that is, the actual fitting clearance of the plunger couple may have a trend of being much smaller than the designed fitting clearance of the plunger couple, the gap between the plunger and the plunger sleeve is very small, and the actual fitting clearance of the plunger couple has a trend of approaching 0 mm, and the corresponding plunger couple actually has a high risk of getting stuck, which will indicate that there is a risk in the fitting relationship of the plunger couple, thereby solving the technical problem of reducing the risk of getting stuck of the plunger couple.

[0090] Second, as Figure 4 As shown, the present invention provides a device for calculating the degree of fit of a plunger pair of an internal combustion engine, which implements or does not implement the method for calculating the degree of fit of a plunger pair of an internal combustion engine as described in any one of the first aspects above, and includes an acquisition unit, a processor, and a storage unit, wherein the processing unit includes a first calculation unit, a second calculation unit, and a third calculation unit:

[0091] An acquisition unit is provided to acquire the tightening torque N when the fastener 300 is pre-tightened and connected to the plunger sleeve 100, the design matching clearance G of the plunger pair, the diameter D of the oil inlet and return holes of the plunger sleeve 100, and the length L of the oil inlet and return holes; acquire the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the oil inlet pressure P1, P2, ..., Pi..., PM, the oil density E1, E2, ..., Ei, ..., EM of the oil inlet, oil supply and oil return working cycle of the M-th plunger pair, and send them to the processor;

[0092] The first calculation unit calculates the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M of the first plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle, and sends them to the second calculation unit;

[0093] The second calculation unit calculates the piston pair fitting clearance deformation G1, G2, ..., Gi..., GM of the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., and the M-th piston pair oil inlet, oil supply and oil return working cycle according to the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M, and sends them to the third calculation unit;

[0094] The third calculation unit calculates the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle according to the plunger pair design matching clearance G, and sends them to the storage unit. The plunger pair matching degrees Gdi and GdM are respectively:

[0095] Gdi=1-Gi / G, GdM=1-GM / G;

[0096] i=1,2,...,M-1; M is the total number of oil inlet, oil supply and oil return working cycles of the plunger pair;

[0097] A storage unit stores the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., and the M-th plunger pair oil inlet, oil supply and oil return working cycle.

[0098] Optionally, the plunger pair fitting clearance deformation Gi includes: a first fitting clearance deformation Gi, a second fitting clearance deformation Gi and a third fitting clearance deformation Gi, and the plunger pair fitting clearance deformation Gi is;

[0099] Gi=λ1G1i+λ2G2i+λ3G3i+ηiGi-1

[0100] GM=λ1G1M+λ2G2M+λ3G2M+ηMGM-1

[0101] Among them, i=1,2,...,M-1, λ1, λ2, λ3 are constants, ηi is the adjustment coefficient of the fit clearance deformation of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, ηM is the adjustment coefficient of the fit clearance deformation of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle, η1=0, G0=0.

[0102] In some embodiments, the piston pair fitting clearance deformation Gi includes: a first fitting clearance deformation G1i, a second fitting clearance deformation G2i and a third fitting clearance deformation G3i, the first fitting clearance deformation G1i can be a positive value or a negative value, the second fitting clearance deformation G2i can be a positive value or a negative value, and the third fitting clearance deformation G3i can be a positive value or a negative value. Based on the first fitting clearance deformation G1i, the second fitting clearance deformation G2i, the third fitting clearance deformation G3i and the last fitting clearance deformation Gi-1, the piston pair fitting clearance deformation Gi can be calculated. It should be noted that, during the first oil inlet, oil supply and oil return working cycle of the plunger pair, the previous plunger pair fit clearance deformation does not exist, and G0 can be set to 0 accordingly. The calculation of the plunger pair fit clearance deformation G1 only needs to consider the first fit clearance deformation G11, the second fit clearance deformation G21 and the third fit clearance deformation G31, G1=λ1G11+λ2G21+λ3G31, λ1, λ2, λ3 can also be obtained based on human experience or simulation of the plunger pair fit clearance structure.

[0103] In some embodiments, in the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle, the calculation of the plunger pair fit clearance deformation Gi needs to consider the first fit clearance deformation G1i, the second fit clearance deformation G2i, the third fit clearance deformation G3i and the previous plunger pair fit clearance deformation Gi-1, so that the calculation of the plunger pair fit clearance deformation Gi is not only based on the first fit clearance deformation G1i, the second fit clearance deformation G2i, and the third fit clearance deformation G3i, but also can consider The influence of the piston couple fit clearance deformation Gi-1 of the previous piston couple oil inlet, oil supply and oil return working cycle, and the fit clearance deformation adjustment coefficient ηi are set, accordingly, the η1, η2..., ηi, ..., ηM of the first piston couple oil inlet, oil supply and oil return working cycle, the second piston couple oil inlet, oil supply and oil return working cycle,..., the i-th piston couple oil inlet, oil supply and oil return working cycle,..., the M-th piston couple oil inlet, oil supply and oil return working cycle can all be obtained based on human experience or simulation of the piston couple fit clearance structure, and the value of ηi can come from a certain numerical range. Of course, it should be noted that η1=0, G0=0.

[0104] In some embodiments, the first fitting clearance deformation G1i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the first fitting clearance deformation G1M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle; the second fitting clearance deformation G2i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the second fitting clearance deformation G2M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle; the third fitting clearance deformation G3i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the third fitting clearance deformation G3M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle are respectively: G1i=P11*N+P12*Pi , G1M=P11*N+P12*PM; G2i=P2i*D+P2 / L, G2M=P2M*D+P2 / L; G3i=P3*G*Ei / E, G3M=P3*G*EM / E; where N is the tightening torque, P11 is the first clearance adjustment coefficient one, P12 is the first clearance adjustment coefficient two; D is the diameter of the oil inlet and return hole, L is the length of the oil inlet and return hole, P2i is the second clearance adjustment coefficient one of the i-th plunger pair oil inlet, oil supply and oil return working cycle, P2 is the second clearance adjustment coefficient two, P2M is the second clearance adjustment coefficient; E is the original oil inlet density, and P3 is the third clearance adjustment coefficient. It should be noted that at least the first fit clearance deformation G1i, the second fit clearance deformation G2i, and the third fit clearance deformation G3i can be exactly the same as those recorded in the first aspect, and the present invention application will not be repeated here.

[0105] Optionally, the internal combustion engine plunger pair matching calculation device also includes: a display unit, and the processor also obtains the maximum value Gdmax of the plunger pair matching and the minimum value Gdmin of the plunger pair matching, Gdmax=Max[Gd1, Gd2, ..., Gdi..., GdM], Gdmin=Min[Gd1, Gd2, ..., Gdi..., GdM], when Gdmax≥0.95, the processor sends an instruction to the display unit, and the display unit prompts that there is a risk in the matching relationship of the plunger pair; when Gdmin≤0.2, the processor sends an instruction to the display unit, and the display unit prompts that there is a risk in the matching relationship of the plunger pair.

[0106] In some embodiments, after the storage unit stores the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., and the M-th plunger pair oil inlet, oil supply and oil return working cycle, the processor can also obtain the plunger pair matching degrees of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., and the M-th plunger pair oil inlet, oil supply and oil return working cycle. The maximum value of the piston pair matching degree Gdmax=Max[Gd1, Gd2, ..., Gdi..., GdM] among Gd1, Gd2, ..., Gdi..., GdM, the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., the minimum value of the piston pair matching degree Gdmin=Min[Gd1, Gd2, ..., Gdi..., GdM] among the M-th piston pair oil inlet, oil supply and oil return working cycle.

[0107] In some embodiments, the internal combustion engine plunger pair matching degree calculation device further includes a display unit. After the processor calculates and obtains the maximum value Gdmax and the minimum value Gdmin of the plunger pair matching degree, the plunger pair matching risk can be judged in combination with the judgment conditions. Specifically, judging the plunger pair matching risk in combination with the judgment conditions includes:

[0108] When Gdmax≥0.95, it indicates that the actual fitting clearance deformation of the plunger pair has reached up to 5% of the designed fitting clearance G of the plunger pair, that is, the actual fitting clearance of the plunger pair may have a trend of being larger than the designed fitting clearance of the plunger pair, and the corresponding plunger pair actually has a high risk of oil leakage and stagnation. The corresponding processor can send instructions to the display unit, and prompt the display unit that there is a risk in the fitting relationship of the plunger pair, thereby solving the technical problem of reducing the risk of oil leakage of the plunger pair; when Gdmin≤0.2, it indicates that the actual fitting clearance deformation of the plunger pair has reached 80% of the designed fitting clearance deformation G of the plunger pair, that is, the actual fitting clearance of the plunger pair will have a trend of being much smaller than the designed fitting clearance of the plunger pair, the gap between the plunger and the plunger sleeve is very small, and the actual fitting clearance of the plunger pair has a trend of approaching 0mm. The corresponding plunger pair actually has a high risk of getting stuck, and the corresponding processor can send instructions to the display unit, and prompt the display unit that there is a risk in the fitting relationship of the plunger pair, thereby solving the technical problem of reducing the risk of getting stuck of the plunger pair.

[0109] In a third aspect, the present invention application provides a device for calculating the degree of fit of a plunger pair of an internal combustion engine, the device comprising a processor, a memory, and a calculation program stored in the memory and executable by the processor, wherein when the calculation program is executed by the processor, the steps of the method for calculating the degree of fit of a plunger pair of an internal combustion engine as described in any one of the first aspects are implemented.

[0110] In a fourth aspect, the present invention application provides a computer-readable storage medium having a calculation program stored thereon, wherein when the calculation program is executed by a processor, the steps of the method for calculating the degree of fit of an internal combustion engine plunger pair as described in any one of the first aspects are implemented.

[0111] In the internal combustion engine plunger pair matching degree calculation method, device, equipment and medium of the present invention, first, the first calculation unit of the internal combustion engine plunger pair matching degree calculation device calculates the first matching gap deformation G1i, the second matching gap deformation G2i and the third matching gap deformation G3i, the second calculation unit calculates the plunger pair matching gap Gi, the third calculation unit calculates the plunger pair matching degree Gdi, and the storage unit stores the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the plunger pair matching degrees Gd1, Gd2, of the M-th plunger pair oil inlet, oil supply and oil return working cycle. .., Gdi..., GdM, so that under the actual working conditions of the internal combustion engine, the matching conditions of the plunger pair can still be roughly known, solving the technical problem of determining the matching conditions of the plunger pair of the internal combustion engine; in addition, the matching degree Gdi of the plunger pair is used to evaluate the actual matching performance of the plunger pair. The numerical value of Gdi can be used to judge the matching conditions of the plunger pair, thereby helping the actual operators of the internal combustion engine to grasp the working conditions of the plunger pair, and the matching risks of the plunger pair can also be judged in combination with the judgment conditions. When Gdmax≥1.05 or when Gdmin≤0.2, it is displayed to prompt that there is a risk in the matching relationship of the plunger pair, solving the technical problem of reducing the risk of oil leakage or jamming of the plunger pair.

[0112] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. It can be understood by those skilled in the art that the various operations, methods, steps, measures, and schemes in the process discussed in the present invention application can be alternated, changed, combined or deleted; further, other steps, measures, and schemes in the various operations, methods, and processes discussed in the present invention application can also be alternated, changed, rearranged, decomposed, combined or deleted; further, the various operations, methods, and steps, measures, and schemes in the prior art disclosed in the present invention application can also be alternated, changed, rearranged, decomposed, combined or deleted.

[0113] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can 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 this application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0114] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0115] The above-described embodiments only express several implementation methods of the embodiments of the present disclosure, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the embodiments of the present disclosure. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the embodiments of the present disclosure, which all belong to the protection scope of the embodiments of the present disclosure. Therefore, the protection scope of the embodiments of the present disclosure shall be based on the attached claims.

Claims

1. A method for calculating the degree of fit of a plunger pair of an internal combustion engine, the plunger pair comprising: The plunger sleeve, the plunger and the fastener, the plunger sleeve is provided with an oil inlet and return hole and a plunger cavity, the fastener is pre-fastened and connected to the plunger sleeve, and is characterized in that it includes the following steps: S100, obtaining the tightening torque N when the fastener is pre-tightened to connect the plunger sleeve, the design matching clearance G of the plunger pair, the diameter of the oil inlet and return holes of the plunger sleeve and the length of the oil inlet and return holes; obtaining the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the oil inlet pressure P1, P2, ..., Pi..., PM, and the oil density E1, E2, ..., Ei, ..., EM in the M-th plunger pair oil inlet, oil supply and oil return working cycle; S200, calculating the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M of the first plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle; S300, calculating the piston pair fitting clearance deformation amounts G1, G2, ..., Gi..., GM of the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., and the M-th piston pair oil inlet, oil supply and oil return working cycle according to the first fitting clearance deformation amounts G11, G12, ..., G1i..., G1M, the second fitting clearance deformation amounts G21, G22, ..., G2i..., G2M and the third fitting clearance deformation amounts G31, G32, ..., G3i..., G3M; S400, according to the design matching clearance G of the plunger pair, the matching degrees Gd1, Gd2, ..., Gdi, ..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle are calculated. The matching degrees Gdi and GdM of the plunger pair are respectively: Gdi=1-Gi / G, GdM=1-GM / G; i=1,2,...,M-1; M is the total number of working cycles of the plunger pair for oil inlet, oil supply and oil return.

2. A method for calculating the degree of fit of a plunger pair of an internal combustion engine according to claim 1, characterized in that: The first fitting clearance deformation G1i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the first fitting clearance deformation G1M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle; the second fitting clearance deformation G2i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the second fitting clearance deformation G2M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle; the third fitting clearance deformation G3i of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, the third fitting clearance deformation G3M of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle are respectively: G1i=P11*N+P12*Pi, G1M=P11*N+P12*PM; G2i=P2i*D+P2 / L, G2M=P2M*D+P2 / L; G3i=P3*G*Ei / E, G3M=P3*G*EM / E; Among them, P11 is the first clearance adjustment coefficient one, P12 is the first clearance adjustment coefficient two; D is the diameter of the oil inlet and return holes, L is the length of the oil inlet and return holes, P2i is the second clearance adjustment coefficient one of the i-th plunger pair's oil inlet, oil supply and oil return working cycle, P2 is the second clearance adjustment coefficient two, P2M is the second clearance adjustment coefficient; E is the original oil inlet density, and P3 is the third clearance adjustment coefficient.

3. A method for calculating the degree of fit of a plunger pair of an internal combustion engine according to claim 2, characterized in that: The deformation amount of the clearance of the plunger pair Gi includes: the deformation amount of the first clearance G1i, the deformation amount of the second clearance G2i and the deformation amount of the third clearance G3i. The deformation amounts of the clearance of the plunger pair Gi and GM are respectively; Gi=λ1G1i+λ2G2i+λ3G3i+ηiGi-1 GM=λ1G1M+λ2G2M+λ3G2M+ηMGM-1 Among them, i=1,2,...,M-1, λ1, λ2, λ3 are constants, ηi is the adjustment coefficient of the fit clearance deformation of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, ηM is the adjustment coefficient of the fit clearance deformation of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle, η1=0, G0=0.

4. A method for calculating the degree of fit of a plunger pair of an internal combustion engine according to claim 3, characterized in that: Step S400 also includes step S500: obtaining the maximum value Gdmax and the minimum value Gdmin of the degree of fit of the plunger pair, Gdmax=Max[Gd1, Gd2, ..., Gdi..., GdM], Gdmin=Min[Gd1, Gd2, ..., Gdi..., GdM], and judging the risk of the plunger pair fitting in combination with the judgment conditions.

5. A method for calculating the degree of fit of a plunger pair of an internal combustion engine according to claim 4, characterized in that: In step S500, judging the risk of the plunger assembly matching in combination with the judging conditions includes: When Gdmax≥0.95, it indicates that there is a risk in the matching relationship between the plunger and the piston. When Gdmin≤0.2, it indicates that there is a risk in the matching relationship of the plunger and piston.

6. A device for calculating the degree of fit of a plunger pair of an internal combustion engine, which implements the method for calculating the degree of fit of a plunger pair of an internal combustion engine as described in any one of claims 1 to 5, comprising: An acquisition unit, a processor and a storage unit, wherein the processor includes a first calculation unit, a second calculation unit and a third calculation unit, characterized in that: an acquisition unit, for acquiring the tightening torque N when the fastener is pre-tightened to connect the plunger sleeve, the design matching clearance G of the plunger pair, the diameter D of the oil inlet and return holes of the plunger sleeve, and the length L of the oil inlet and return holes; acquiring the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the oil inlet pressure P1, P2, ..., Pi..., PM, the oil density E1, E2, ..., Ei, ..., EM of the oil inlet, oil supply and oil return working cycle of the M-th plunger pair, and sending them to the processor; The first calculation unit calculates the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M of the first plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle, and sends them to the second calculation unit; The second calculation unit calculates the piston pair fitting clearance deformation G1, G2, ..., Gi..., GM of the first piston pair oil inlet, oil supply and oil return working cycle, the second piston pair oil inlet, oil supply and oil return working cycle, ..., the i-th piston pair oil inlet, oil supply and oil return working cycle, ..., and the M-th piston pair oil inlet, oil supply and oil return working cycle according to the first fitting clearance deformation G11, G12, ..., G1i..., G1M, the second fitting clearance deformation G21, G22, ..., G2i..., G2M and the third fitting clearance deformation G31, G32, ..., G3i..., G3M, and sends them to the third calculation unit; The third calculation unit calculates the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., the M-th plunger pair oil inlet, oil supply and oil return working cycle according to the plunger pair design matching clearance G, and sends them to the storage unit. The plunger pair matching degrees Gdi and GdM are respectively: Gdi=1-Gi / G, GdM=1-GM / G; i=1,2,...,M-1; M is the total number of oil inlet, oil supply and oil return working cycles of the plunger pair; A storage unit stores the plunger pair matching degrees Gd1, Gd2, ..., Gdi..., GdM of the first plunger pair oil inlet, oil supply and oil return working cycle, the second plunger pair oil inlet, oil supply and oil return working cycle, ..., the i-th plunger pair oil inlet, oil supply and oil return working cycle, ..., and the M-th plunger pair oil inlet, oil supply and oil return working cycle.

7. The internal combustion engine plunger matching degree calculation device according to claim 6, characterized in that: The deformation amount of the clearance of the plunger pair Gi includes: the deformation amount of the first clearance G1i, the deformation amount of the second clearance G2i and the deformation amount of the third clearance G3i. The deformation amounts of the clearance of the plunger pair Gi and GM are respectively: Gi=λ1G1i+λ2G2i+λ3G3i+ηiGi-1 GM=λ1G1M+λ2G2M+λ3G2M+ηMGM-1 Among them, i=1,2,...,M-1, λ1, λ2, λ3 are constants, ηi is the adjustment coefficient of the fit clearance deformation of the i-th plunger pair in the oil inlet, oil supply and oil return working cycle, ηM is the adjustment coefficient of the fit clearance deformation of the M-th plunger pair in the oil inlet, oil supply and oil return working cycle, η1=0, G0=0.

8. The device for calculating the degree of fit of plunger pairs of an internal combustion engine according to claim 7, characterized in that: The internal combustion engine plunger pair matching degree calculation device also includes: a display unit, and the processor further obtains the maximum value Gdmax of the plunger pair matching degree and the minimum value Gdmin of the plunger pair matching degree; Gdmax=Max[Gd1, Gd2,...,Gdi...,GdM]; Gdmin=Min[Gd1, Gd2,...,Gdi...,GdM]; When Gdmax≥0.95, the processor sends an instruction to the display unit, and the display unit prompts that there is a risk in the matching relationship of the plunger and the pair; When Gdmin≤0.2, the processor sends an instruction to the display unit, and the display unit prompts that there is a risk in the matching relationship of the plunger pair.

9. An internal combustion engine plunger matching degree calculation device, characterized in that: The plunger pair matching degree calculation device comprises a processor, a memory, and a calculation program stored in the memory and executable by the processor, wherein when the calculation program is executed by the processor, the steps of the internal combustion engine plunger pair matching degree calculation method as claimed in any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a calculation program, wherein when the calculation program is executed by a processor, the steps of the internal combustion engine plunger pair matching degree calculation method according to any one of claims 1 to 5 are implemented.

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