CN112345256A - Engine cylinder fatigue test method - Google Patents
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- CN112345256A CN112345256A CN202011305120.4A CN202011305120A CN112345256A CN 112345256 A CN112345256 A CN 112345256A CN 202011305120 A CN202011305120 A CN 202011305120A CN 112345256 A CN112345256 A CN 112345256A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004088 simulation Methods 0.000 claims abstract description 122
- 239000003921 oil Substances 0.000 claims abstract description 23
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 18
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000013461 design Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 230000004323 axial length Effects 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000012795 verification Methods 0.000 abstract description 4
- 238000013441 quality evaluation Methods 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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Abstract
The invention discloses a fatigue test method for an engine cylinder, which belongs to the technical field of engines and comprises an assembled cylinder, a simulation piston, a simulation cylinder cover, a simulation crankshaft, a connecting rod and an actual piston; injecting hydraulic oil with preset pressure into the corresponding cylinder barrel through each oil injection hole in sequence according to a preset oil injection sequence, and injecting oil circularly for M times, wherein the acting force of the hydraulic oil is transmitted to the cylinder body through the simulation piston; establishing an engine simulation model, simulating the actual working condition of the engine to perform CAE analysis on the cylinder body, and determining the stress concentration area of the cylinder body so as to verify whether the actual fracture area of the cylinder body is the same as the position of the stress concentration area of the cylinder body. The assembly of the simulation piston, the simulation cylinder cover and the simulation crankshaft and the cylinder body is adopted for verification, so that the fatigue test of the cylinder body can be realized, the test cost can be reduced, and the test repeatability is high; and the actual simulation can be compared with CAE analysis and verified, the reliability of the test result is improved, and data support is provided for the quality evaluation of the cylinder body.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a fatigue test method for an engine cylinder body.
Background
The cylinder block is an important part of an engine, and the fatigue performance of the cylinder block must be verified in the development and production of the engine so as to determine the reasonability of the design, the production process and the material of the cylinder block.
The cylinder fatigue test is mainly used for examining the reliability of the cylinder, so that an engine cylinder fatigue test method is urgently needed to realize the fatigue test of the engine cylinder.
Disclosure of Invention
The invention aims to provide a fatigue test method for an engine cylinder block, which is used for realizing a fatigue test for the engine cylinder block.
As the conception, the technical scheme adopted by the invention is as follows:
a fatigue test method for an engine cylinder block comprises the following steps that the engine cylinder block comprises N main bearing walls, a cylinder barrel is arranged between every two adjacent main bearing walls, N is more than or equal to 2 and is a positive integer, and the fatigue test method for the engine cylinder block comprises the following steps:
extracting design parameters of the engine; the design parameters comprise the inner diameter of the cylinder barrel, the height of a ring land, the stroke, the cylinder center distance between two adjacent cylinder barrels, the number of the cylinder barrels, the height of a cylinder cover, the positions and the apertures of bolt holes of the cylinder cover and the diameter of a main journal of the crankshaft;
manufacturing a simulation piston based on the inner diameter of the cylinder barrel, the height of a ring land and the stroke; manufacturing a simulation cylinder cover based on the height of the cylinder cover, the distance between the cylinder centers, the number of the cylinder barrels, the positions of the bolt holes of the cylinder cover and the hole diameter, wherein the simulation cylinder cover is provided with an oil injection hole corresponding to the center of each cylinder barrel; manufacturing a simulated crankshaft based on the diameter of a crankshaft main shaft, and selecting an actual piston matched with the inner diameter of the cylinder barrel and a connecting rod connected with the actual piston;
assembling a cylinder body, a simulation piston, a simulation cylinder cover, a simulation crankshaft, a connecting rod and an actual piston, wherein the simulation piston and the connecting rod are respectively positioned at the upper side and the lower side of the actual piston, and the connecting rod is connected with the simulation crankshaft;
injecting hydraulic oil with preset pressure into the corresponding cylinder barrel through each oil injection hole in sequence according to a preset oil injection sequence, and injecting oil circularly for M times, wherein the acting force of the hydraulic oil is transmitted to the cylinder body through the simulation piston; m is a positive integer;
an engine simulation model is established based on design parameters, CAE analysis is carried out on the cylinder body by simulating the actual working condition of the engine, and the stress concentration area of the cylinder body is determined so as to verify whether the stress concentration area of the cylinder body is the same as the position of the actual fracture area of the cylinder body.
Further, the preset oiling sequence is an ignition sequence of the N-1 cylinder barrels of the engine.
Further, a main bearing cap bolt is mounted on the main bearing wall of the cylinder block.
Furthermore, the simulation crankshaft comprises N-1 simulation crankshaft units, each simulation crankshaft unit comprises a simulation connecting rod journal for connecting the connecting rod, two simulation cranks respectively located at two axial sides of the simulation connecting rod journal, and simulation main journals respectively located at two axial sides of the simulation connecting rod journal, each simulation crank is located between the simulation connecting rod journal and one simulation main journal, the diameter of each simulation main journal is equal to the diameter of the corresponding crankshaft main journal, and the diameter of each simulation connecting rod journal is equal to the diameter of the corresponding crankshaft connecting rod journal.
Further, the axes of the simulated main journal, the simulated connecting rod journal and the simulated crank coincide.
Further, the simulation main journal coincides with the axis of the simulation crank, and the axis of the simulation connecting rod journal and the axis of the simulation main journal are arranged in a staggered mode.
Further, the simulation piston comprises a simulation piston main body, the simulation piston main body comprises a first portion and a second portion which are connected, the diameter of the first portion is smaller than that of the second portion, the diameter of the second portion is equal to that of the actual piston, and the second portion abuts against the actual piston.
Further, the simulation piston further comprises a sealing ring, wherein the sealing ring is sleeved on the first portion and is arranged at a shoulder formed by the first portion and the second portion.
Further, the axial length of the first portion is equal to the sum of the 5% stroke, the height of the Y-shaped seal ring and the height of a land, and the axial length of the simulated piston body is equal to 1/2 strokes minus 3 mm.
The invention has the beneficial effects that:
the fatigue test method of the engine cylinder body provided by the invention comprises the steps of extracting design parameters of the engine; the design parameters comprise the inner diameter of the cylinder barrel, the height of a ring land, the stroke, the cylinder center distance between two adjacent cylinder barrels, the number of the cylinder barrels, the height of a cylinder cover, the position and the aperture of a bolt hole of the cylinder cover and the diameter of a main journal of the crankshaft; manufacturing a simulation piston based on the inner diameter of the cylinder barrel, the height of a ring land and the stroke; manufacturing a simulation cylinder cover based on the height of the cylinder cover, the distance between the cylinder centers, the number of the cylinder barrels, the positions of the bolt holes of the cylinder cover and the hole diameter, wherein the simulation cylinder cover is provided with an oil injection hole corresponding to the center of each cylinder barrel; manufacturing a simulated crankshaft based on the diameter of a crankshaft main shaft, and selecting an actual piston matched with the inner diameter of the cylinder barrel and a connecting rod connected with the actual piston; assembling a cylinder body, a simulation piston, a simulation cylinder cover, a simulation crankshaft, a connecting rod and a piston, wherein the simulation piston and the connecting rod are respectively positioned at the upper side and the lower side of the piston, and the connecting rod is connected with the simulation crankshaft; injecting hydraulic oil with preset pressure into the corresponding cylinder barrel through each oil injection hole in sequence according to a preset oil injection sequence, and injecting oil circularly for M times, wherein the acting force of the hydraulic oil is transmitted to the cylinder body through the simulation piston, and M is a positive integer; an engine simulation model is established based on design parameters, CAE analysis is carried out on the cylinder body by simulating the actual working condition of the engine, the stress concentration area of the cylinder body is determined, and whether the position of the stress concentration area of the cylinder body is the same as the position of the actual fracture area of the cylinder body is verified.
The actual assembly state of the engine is simulated through the simulation piston, the simulation cylinder cover, the simulation crankshaft, the connecting rod and the actual piston, acting force is applied to the simulation piston through hydraulic oil, the acting force is transmitted to the cylinder body 1 through the simulation piston to simulate the actual working condition of the engine, the simulation of the cylinder body under the actual working condition is realized, the fatigue test of the cylinder body is realized, and the quality of the cylinder body is ensured. And the simulation piston, the simulation cylinder cover and the simulation crankshaft are adopted, so that the test cost can be reduced, and the test repeatability is high. In addition, by verifying whether the actual fracture area of the cylinder body is the same as the stress concentration area of the cylinder body, the comparison and verification of CAE analysis and actual simulation are realized, the reliability of the test result is improved, and data support is provided for quality evaluation of the cylinder body.
Drawings
FIG. 1 is a schematic illustration of an engine provided by the present invention;
fig. 2 is a schematic diagram of a dummy piston provided by the present invention.
In the figure:
1. a cylinder body; 2. simulating a cylinder cover; 21. an oil filler hole; 3. simulating a piston; 31. simulating a piston body; 311. a first part; 312. a second section; 32. a seal ring; 4. a real piston; 5. a connecting rod; 6. simulating a crankshaft monomer; 61. simulating a connecting rod journal; 62. simulating a crank; 63. a main journal is simulated.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in FIG. 1, a cylinder body 1 of the engine comprises N main bearing arms, a cylinder barrel is arranged between every two adjacent main bearing arms, N is more than or equal to 2, and N is a positive integer. Specifically, in the present embodiment, N is 5, that is, the cylinder block 1 has 4 cylinder barrels, and the engine is a four-cylinder engine, but in other embodiments, the specific value of N may also be selected according to actual needs.
As shown in fig. 2, the present embodiment provides an engine block fatigue test method, including:
extracting design parameters of the engine, wherein the design parameters comprise the inner diameter of a cylinder barrel, the height of a ring land, the stroke, the cylinder center distance between two adjacent cylinder barrels, the number of the cylinder barrels, the height of a cylinder cover, the positions and the apertures of bolt holes of the cylinder cover and the diameter of a main journal of a crankshaft;
the inner diameter of the cylinder barrel, the height of a ring land, the stroke, the cylinder center distance of two adjacent cylinder barrels and the number of the cylinder barrels in the design parameters can be obtained from the design drawing of the cylinder body 1. The height of the cylinder cover, the position of the cylinder cover bolt hole and the aperture can be obtained from the design paper of the cylinder cover. The crankshaft main journal diameter can be obtained from the design drawing of the crankshaft.
And establishing an engine simulation model in simulation software according to the design parameters, simulating the actual working condition of the engine to perform CAE analysis on the cylinder body 1, and determining the stress concentration area of the cylinder body 1. The establishment of the engine simulation model and the simulation of the actual working condition of the engine in the simulation software are mature prior art, and are not described herein again.
Manufacturing a simulation piston 3 based on the inner diameter of the cylinder barrel, the height of a ring land and the stroke; manufacturing a simulation cylinder cover 2 based on the height of the cylinder cover, the distance between the cylinder centers, the number of the cylinder barrels, the positions of the bolt holes of the cylinder cover and the hole diameter, wherein the simulation cylinder cover 2 is provided with an oil injection hole 21 corresponding to the center position of each cylinder barrel; manufacturing a simulated crankshaft based on the diameter of a crankshaft main shaft, and selecting an actual piston matched with the inner diameter of the cylinder barrel and a connecting rod connected with the actual piston;
the method comprises the steps of assembling a cylinder body 1, a simulation piston 3, a simulation cylinder cover 2, a simulation crankshaft, a connecting rod 5 and an actual piston 4, wherein the connecting rod 5 and the simulation piston 3 are respectively positioned on two sides of the actual piston 4, and the connecting rod 5 is connected with the simulation crankshaft. The main bearing cap bolts are installed on the main bearing wall of the cylinder body 1.
And injecting hydraulic oil with preset pressure into the corresponding cylinder barrel through each oil injection hole in sequence according to a preset oil injection sequence, and injecting the hydraulic oil circularly for M times, wherein the acting force of the hydraulic oil is transmitted to the cylinder body 1 through the simulation piston 3, and M is a positive integer. The preset pressure of the hydraulic oil is calculated by the maximum burst pressure designed for the cylinder 1, and the maximum burst pressure designed for different cylinders 1 is different.
Establishing an engine simulation model, simulating the actual working condition of the engine to perform CAE analysis on the cylinder body 1, determining the stress concentration area of the cylinder body 1, and verifying whether the stress concentration area of the cylinder body is the same as the position of the actual fracture area of the cylinder body. CAE analysis is carried out to cylinder body 1 through simulation engine operating condition, can obtain the weak region on the cylinder body 1, and the stress concentration area that also is easy to break off carries out CAE analysis and actual simulation's mutual verification through comparing with the actual fracture area of cylinder body, improves engine cylinder body fatigue test's reliability. The establishment of the engine simulation model and the CAE analysis of the cylinder block 1 are mature prior art, and are not described herein again.
The assembled engine is shown in fig. 1. Specifically, in the present embodiment, the dummy crankshaft includes N-1 dummy crankshaft units 6, the dummy crankshaft units 6 include dummy connecting rod journals 61 for connecting the connecting rods 5, dummy cranks 62 respectively located on both axial sides of the dummy connecting rod journals 61, and dummy main journals 63 respectively located on both axial sides of the two dummy connecting rod journals 61, and each dummy crank 62 is located between the dummy connecting rod journal 61 and one of the dummy main journals 63. The diameter of the simulated main journal 63 is equal to the diameter of the crankshaft main shaft, and the diameter of the simulated connecting rod journal 61 is equal to the diameter of the crankshaft connecting rod journal.
Further, in the present embodiment, the dummy connecting rod journal 61, the dummy crank 62, and the dummy main journal 63 constituting the dummy crank unit 6 are integrally formed. Further preferably, the axes of the dummy main journal 63, the dummy connecting rod journal 61 and the dummy crank 62 coincide. Or the axes of the dummy main journal 63 and the dummy crank 62 are overlapped, and the axis of the dummy link journal 61 and the axis of the dummy main journal 62 are offset. By adopting the simulation crankshaft, the engine crankshaft in the actual engine assembling process can be replaced, the design and the processing are simple, and the test cost can be reduced.
Specifically, in the present embodiment, the dummy piston 3 includes a dummy piston main body 31 and a seal ring 32, the dummy piston main body 31 includes a first portion 311 and a second portion 312 connected to each other, a diameter of the first portion 311 is smaller than a diameter of the second portion 312, a diameter of the second portion 312 is equal to a diameter of the actual piston 4, and the second portion 312 abuts against the actual piston 4. A shoulder is formed between the first portion 311 and the second portion 312, the sealing ring 32 is sleeved on the first portion 311 and is mounted on the shoulder, and the sealing ring 32 plays a role in sealing. The seal ring 32 is preferably a Y-shaped seal ring.
Further, since the dummy piston 3 does not reciprocate up and down in the cylinder fatigue test but transmits the hydraulic pressure at the top portion downward, in the present embodiment, the axial length of the first portion 31 of the dummy piston 3 is equal to the sum of the 5% stroke, the height of the seal ring 32 and the height of one land, and the axial length of the dummy piston body 3 is equal to 1/2 stroke minus 3 mm. The dummy piston 3 designed according to the above dimensions is relatively strong and not easily damaged.
Specifically, in the present embodiment, the engine is a four-cylinder engine, four cylinders are defined as a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, respectively, and the ignition sequence of the engine is first cylinder to third cylinder to second cylinder to fourth cylinder. The preset oiling sequence is the same as the ignition sequence of the engine, namely the preset oiling sequence is a first cylinder barrel, a third cylinder barrel, a second cylinder barrel and a fourth cylinder barrel. Acting on simulation piston 3 through hydraulic oil, the effort of hydraulic oil is transmitted to cylinder body 1 through simulation piston 3, realizes the simulation to engine actual conditions, and then realizes the fatigue test to the cylinder body. The input of the hydraulic oil can be realized through hydraulic equipment, and the hydraulic equipment is loaded by sine waves or triangular waves.
In summary, the fatigue test method for the engine cylinder provided by the embodiment extracts the design parameters of the engine; the design parameters comprise the inner diameter of the cylinder barrel, the height of a ring land, the stroke, the cylinder center distance between two adjacent cylinder barrels, the number of the cylinder barrels, the height of a cylinder cover, the position and the aperture of a bolt hole of the cylinder cover and the diameter of a main journal of the crankshaft; manufacturing a simulation piston 3 based on the inner diameter of the cylinder barrel, the height of a ring land and the stroke; manufacturing a simulation cylinder cover 2 based on the height of the cylinder cover, the distance between the cylinder centers, the number of the cylinder barrels, the positions of the bolt holes of the cylinder cover and the hole diameter, wherein the simulation cylinder cover 2 is provided with an oil injection hole 21 corresponding to the center position of each cylinder barrel; manufacturing a simulated crankshaft based on the diameter of a crankshaft main shaft, and selecting an actual piston 4 matched with the inner diameter of the cylinder barrel and a connecting rod 5 connected with the actual piston 4; assembling a cylinder body 1, a simulation piston 3, a simulation cylinder cover 2, a simulation crankshaft, a connecting rod 5 and an actual piston 4, wherein the simulation piston 3 and the connecting rod 5 are respectively positioned at the upper side and the lower side of the actual piston 4, and the connecting rod 5 is connected with the simulation crankshaft; injecting hydraulic oil with preset pressure into the corresponding cylinder barrel sequentially through each oil injection hole 21 according to a preset oil injection sequence, and performing cyclic oil injection for M times, wherein M is a positive integer; establishing an engine simulation model, simulating the actual working condition of the engine to perform CAE analysis on the cylinder body, determining the stress concentration area of the cylinder body 1, and verifying whether the stress concentration area of the cylinder body 1 is the same as the position of the actual fracture area of the cylinder body 1. The actual assembly state of the engine is simulated through the simulation piston 3, the simulation cylinder cover 2, the simulation crankshaft, the connecting rod 5 and the actual piston 4, acting force is applied to the simulation piston 3 through hydraulic oil, the acting force is transmitted to the cylinder body 1 through the simulation piston 3 to simulate the actual working condition of the engine, the simulation of the cylinder body 1 under the actual working condition is achieved, the fatigue test of the cylinder body is achieved, and the quality of the cylinder body is guaranteed. And the simulation piston 3, the simulation cylinder cover 2 and the simulation crankshaft are adopted, so that the test cost can be reduced, and the test repeatability is high. In addition, whether the actual fracture area of the cylinder body 1 is the same as the stress concentration area of the cylinder body 1 or not is verified, the comparison verification of CAE analysis and actual simulation is achieved, the reliability of the test result is improved, data support is provided for quality evaluation of the cylinder body 1, and the actual simulation of the cylinder body 1 can also guide improvement of CAE analysis so as to improve the accuracy of CAE analysis.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A fatigue test method for an engine cylinder block is characterized in that the engine cylinder block comprises N main bearing walls, a cylinder barrel is arranged between every two adjacent main bearing walls, N is more than or equal to 2 and is a positive integer, and the fatigue test method for the engine cylinder block comprises the following steps:
extracting design parameters of the engine; the design parameters comprise the inner diameter of the cylinder barrel, the height of a ring land, the stroke, the cylinder center distance between two adjacent cylinder barrels, the number of the cylinder barrels, the height of a cylinder cover, the positions and the apertures of bolt holes of the cylinder cover and the diameter of a main journal of the crankshaft;
manufacturing a simulation piston based on the inner diameter of the cylinder barrel, the height of a ring land and the stroke; manufacturing a simulation cylinder cover based on the height of the cylinder cover, the distance between the cylinder centers, the number of the cylinder barrels, the positions of the bolt holes of the cylinder cover and the hole diameter, wherein the simulation cylinder cover is provided with an oil injection hole corresponding to the center of each cylinder barrel; manufacturing a simulated crankshaft based on the diameter of a crankshaft main shaft, and selecting an actual piston matched with the inner diameter of the cylinder barrel and a connecting rod connected with the actual piston;
assembling a cylinder body, a simulation piston, a simulation cylinder cover, a simulation crankshaft, a connecting rod and an actual piston, wherein the simulation piston and the connecting rod are respectively positioned at the upper side and the lower side of the actual piston, and the connecting rod is connected with the simulation crankshaft;
injecting hydraulic oil with preset pressure into the corresponding cylinder barrel through each oil injection hole in sequence according to a preset oil injection sequence, and injecting oil circularly for M times, wherein the acting force of the hydraulic oil is transmitted to the cylinder body through the simulation piston; m is a positive integer;
an engine simulation model is established based on design parameters, CAE analysis is carried out on the cylinder body by simulating the actual working condition of the engine, the stress concentration area of the cylinder body is determined, and whether the position of the stress concentration area of the cylinder body is the same as the position of the actual fracture area of the cylinder body is verified.
2. The engine block fatigue testing method of claim 1, wherein said predetermined fueling sequence is a firing sequence of N-1 of said cylinders of said engine.
3. A method of engine block fatigue testing according to claim 1, wherein main bearing cap bolts are mounted on the main bearing walls of the block.
4. The engine block fatigue testing method according to claim 1, wherein the simulation crankshaft includes N-1 simulation crankshaft units including a simulation journal for connecting the connecting rod, two simulation cranks respectively located on both axial sides of the simulation journal, and simulation main journals respectively located on both axial sides of the two simulation journal, each simulation crank being located between the simulation journal and one of the simulation main journals, a diameter of the simulation main journal being equal to a crankshaft main journal diameter, and a diameter of the simulation journal being equal to a crankshaft journal diameter.
5. The engine block fatigue testing method of claim 4, wherein axes of the simulated main journal, the simulated connecting rod journal, and the simulated crank coincide.
6. The engine block fatigue testing method of claim 4, wherein the simulated main journal coincides with an axis of the simulated crank, and an axis of the simulated connecting rod journal and an axis of the simulated main journal are disposed in a staggered manner.
7. The engine block fatigue testing method of claim 1, wherein the dummy piston comprises a dummy piston body comprising a first portion and a second portion connected, the first portion having a diameter smaller than a diameter of the second portion, the second portion having a diameter equal to a diameter of the actual piston, the second portion abutting against the actual piston.
8. The engine block fatigue testing method of claim 7, wherein the dummy piston further comprises a seal ring disposed around the first portion and mounted to a shoulder formed by the first portion and the second portion.
9. An engine block fatigue test method as in claim 8, wherein the axial length of the first portion is equal to the sum of 5% stroke, the height of the Y-ring, and a land height, and the axial length of the dummy piston body is equal to 1/2 stroke minus 3 mm.
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