An engine block test platform

Abstract

This invention relates to the field of engine block testing technology, specifically to an engine block testing platform for airtightness testing of an engine block under test. The platform includes a base on which the engine block under test is placed. The engine block includes multiple cylinder bores for piston sliding, and multiple intake and exhaust channels with intake and exhaust valves installed. Each cylinder bore corresponds to at least one intake channel and one exhaust channel. A comparison engine block identical to the engine block under test and having passed testing is placed on the base. An XY-axis movement module is mounted on the base, and a rotation module is mounted on the output end of the XY-axis movement module. A distance sensor for detecting piston height is mounted on the rotation module. An air injection module is mounted outside the base, and a sealed pipe for injecting air into the intake and exhaust channels is mounted on the output end of the air injection module.

Description

Technical Field

[0001] This invention relates to the field of engine block testing technology, and more specifically to an engine block testing platform. Background Technology

[0002] During the development of new powertrain products, it is crucial to conduct airtightness testing on the cylinder block, cylinder head, and the entire engine assembly. The main purpose is to determine whether the oil passages and water jackets of the engine block and cylinder head are airtight enough, ensuring that the engine does not leak during test operation, thereby improving engine performance and safety.

[0003] Currently, the airtightness test of engine cylinder blocks generally involves sealing both ends of the cylinder bores through which the piston slides, injecting air into the cylinder, and observing the pressure change to determine if there are any gaps causing leakage. While this method can determine if a leak has occurred, it cannot roughly determine where the leak is occurring, nor can it effectively verify the engine structural design scheme, directly affecting designers' ability to formulate the optimal improvement plan.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to design a test platform that uses pistons, intake valves, exhaust valves, etc. to detect whether there is a leak, and at the same time detects that the leak point occurs in the cylinder bore at a relative axial position, and the leak location is around the axial circumference, so as to solve the above-mentioned shortcomings in the technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an engine cylinder block testing platform for air tightness testing of an engine cylinder block under test, comprising a base, on which an engine cylinder block under test is placed, the engine cylinder block under test including multiple cylinder bores for piston sliding, and multiple intake and exhaust channels with intake and exhaust valves installed, one cylinder bore corresponding to at least one intake channel and one exhaust channel, a comparison engine cylinder block identical to the engine cylinder block under test and having passed the test is placed on the base, an XY axis moving module is installed on the base, a rotation module is installed on the output end of the XY axis moving module, a distance sensor for detecting piston height is installed on the rotation module, an air injection module is installed outside the base, and a sealed pipe for injecting air into the intake and exhaust channels is installed on the output end of the air injection module;

[0007] The air injection module injects air into the cylinder bores of the test engine block and the comparison engine block through a sealed pipe, pushing the piston away from the intake valve and creating a high-pressure chamber inside the cylinder bore. After the air injection stops, the descent rate of the piston in the test engine block relative to the piston in the comparison engine block is detected at regular intervals to roughly estimate the vertical height of the leakage point inside the cylinder bore.

[0008] Preferably, the sealing conduit includes a main pipe installed on the output end of the air injection module, an air intake pipe installed between the main pipe and the air intake channel, and an exhaust pipe installed between the main pipe and the exhaust channel.

[0009] Preferably, a first solenoid valve and a second solenoid valve are fixedly installed on the intake pipe and the exhaust pipe, respectively.

[0010] Preferably, a first electronic pressure gauge and a second electronic pressure gauge are fixedly installed on the intake pipe and the exhaust pipe, respectively, and the model of the first electronic pressure gauge and the second electronic pressure gauge is SUX-YB80.

[0011] Preferably, a vent valve is also installed on the main pipe, which can be used to vent air from the main pipe, the intake pipe and the exhaust pipe.

[0012] Preferably, the first solenoid valve, the second solenoid valve, the first electronic pressure gauge, and the second electronic pressure gauge are not installed on the intake pipe and the exhaust pipe on the engine block.

[0013] Preferably, when the number of pistons in the cylinder of the engine under test is set to N, the number of distance sensors is set to N+1. The N distance sensors detect the real-time distance of the N pistons in the cylinder of the engine under test, and one distance sensor detects the real-time distance of one piston in the cylinder of the comparison engine. The model of the distance sensor is: LDM301 / LDM4X.

[0014] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0015] 1. This invention injects gas into the cylinder bores of both the test engine cylinder and the comparison engine cylinder simultaneously through an injection module, causing the piston to be pushed away from the intake valve. In conjunction with a distance sensor, it detects whether the piston in the test engine cylinder changes height within a certain period of time, thereby determining the displacement of the piston relative to the piston in the comparison engine cylinder and thus judging whether leakage has occurred.

[0016] 2. At the same time, when the distance sensor detects the distance of the piston in the cylinder of the engine under test to determine whether there is a leak, it can also determine whether the piston's descent speed has changed by the relationship between the piston's descent height and time. If there is a change, it means that the piston has blocked the gap at a certain height in the cylinder bore, thereby roughly determining the relative height of the gap in the cylinder bore, that is, the circumference of the leak point in the cylinder bore relative axial position. This makes it convenient for subsequent operators to use it and more precise detection equipment to check the specific leak point around the inner wall of the cylinder bore.

[0017] 3. Furthermore, when injecting air into the cylinder bore, the present invention requires first injecting air into the intake and exhaust passages using the intake and exhaust pipes, thereby cooperating with the closed first and second solenoid valves to seal the intake and exhaust passages. The first and second electronic pressure gauges are used to observe whether the pressure value continues to decrease. A decrease indicates that there is a gap and leakage has occurred.

[0018] 4. During testing, this invention can test the cylinder bores in the cylinder block of a multi-cylinder engine under test, thus improving testing efficiency.

[0019] 5. During testing, this invention can either install multiple distance sensors on the rotating module to test the pistons of the engine block under test and the comparison engine block, so that the movement distance of each piston can be monitored in real time, making the test more accurate; or it can use only one distance sensor, and through the cooperation of the XY axis moving module and the rotating module, drive the distance sensor to move to different pistons at regular intervals for testing, monitor the distance difference with the previous monitoring, and thus determine the piston descent speed within the test time difference, thus reducing costs by improving test accuracy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a simplified schematic diagram of the air intake channel of the present invention.

[0023] Figure 3 This is a simplified schematic diagram showing the connection between the sealed pipe of the present invention and the cylinder block of the engine under test;

[0024] Figure 4 This is a simplified diagram of an example of the engine block to be tested according to the present invention;

[0025] Figure 5 This is a simplified diagram of the engine block under test according to the present invention.

[0026] Figure 6 This is a simplified diagram of the engine block under test according to the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Engine block under test; 2. Base; 3. Piston; 4. Cylinder bore; 5. Intake valve; 6. Exhaust valve; 7. Intake passage; 8. Exhaust passage; 9. Comparison engine block; 10. XY axis movement module; 11. Rotation module; 12. Distance sensor; 13. Air injection module; 14. Sealing pipe; 141. Main pipe; 142. Intake pipe; 143. Exhaust pipe; 144. First solenoid valve; 145. Second solenoid valve; 146. First electronic pressure gauge; 147. Second electronic pressure gauge; 148. Vent valve; 15. High-pressure chamber. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0031] This invention provides, for example Figure 1-6The engine block test platform shown includes a base 2, on which are placed an engine block 1 to be tested and an identical comparison engine block 9 that has passed testing. If the engine block 1 is a multi-cylinder engine, it has N cylinder bores 4; if it is a single-cylinder engine, it has one cylinder bore 4. A piston 3 is slidably installed in each cylinder bore 4. The engine block 1 has multiple intake channels 7 and exhaust channels 8. Each cylinder bore 4 corresponds to at least one intake channel 7 and one exhaust channel 8, for example, a single channel, or dual intake channels 7 and dual exhaust channels 8. Intake valves 5 and exhaust valves 6 are installed in the intake channels 7 and exhaust channels 8. When valves 5 and 6 do not inject gas into the intake passage 7 and exhaust passage 8, they will seal the cylinder bore 4 under the action of existing springs, forming a closed high-pressure chamber 15 between the cylinder bore 4, intake valve 5, and exhaust valve 6. The comparison engine block 9 here is the same as the test engine block 1, which has already passed testing. This comparison engine block 9 only needs to use one cylinder bore 4 and the corresponding number of intake passages 7 and exhaust passages 8, which are the same as those of the test engine block 1. An existing air injection module 13 is installed outside the base 2. A main pipe 141 is installed on the output end of the air injection module 13. The test engine Each intake passage 7 and exhaust passage 8 of cylinder block 1, as well as the intake passage 7 and exhaust passage 8 used on engine block 9, are connected to the main pipe 141 by an intake pipe 142 and an exhaust pipe 143. These intake pipes 142 and exhaust pipes 143, together with the main pipe 141, form a sealed conduit 14. When the air injection device injects air into the main pipe 141 to create high pressure, the air passes through the intake pipes 142 and exhaust pipes 143 into the intake passages 7 and 8, thereby pushing open the intake valves 5 and exhaust valves 6. This results in high-pressure gas with the same pressure in the high-pressure chambers 15 of each cylinder bore 4, thus simultaneously pushing the piston 3 away from the intake valve 5 within the cylinder bore 4. The same distance is moved, so when the air injection module 13 stops injecting air into the main pipe 141, the intake valve 5 and the exhaust valve 6 will disconnect the intake passage 7 and the exhaust passage 8 from the cylinder bore 4 under the action of their own springs, so that the high pressure chamber 15 forms a sealed chamber. At this time, since the piston 3 is vertically set in the cylinder bore 4, the piston 3 will compress the air in the high pressure chamber 15 under the action of its own weight. Once there is a gap in the cylinder bore 4 of the engine block 1 under test, the gas will gradually leak out through the piston 3, so that the piston 3 will descend in the cylinder bore 4, and a height difference will be generated with the piston 3 in the comparison engine block 9, so as to determine whether there is a gap in the cylinder bore 4.

[0032] For testing purposes, we installed an XY axis movement module 10 on the base 2, a rotation module 11 on the output end of the XY axis movement module 10, and a distance sensor 12 for detecting the height of the piston 3 on the rotation module 11. There can be one or more distance sensors 12, and each distance sensor 12 can be used to test one piston 3 in turn.

[0033] Meanwhile, we install a first solenoid valve 144 and a second solenoid valve 145 on each intake pipe 142 and exhaust pipe 143, and fix a first electronic pressure gauge 146 and a second electronic pressure gauge 147 on the intake pipe 142 and exhaust pipe 143, so as to detect whether the intake passage 7 and exhaust passage 8 have leaked under sealed conditions. In this way, the air injection module 13 can detect the air tightness of the cylinder bore 4, intake passage 7 and exhaust passage 8 at the same time, and will not make misjudgments or confusions, misjudging the leakage of the cylinder bore 4 as the gap leakage of the exhaust passage 8, and misjudging the gap leakage of the intake passage 7 as the leakage of the cylinder bore 4.

[0034] Example 1: Figure 3 As shown, assuming there is a gap inside the cylinder bore 4, the piston 3 will descend at a basically uniform speed. When the piston 3 descends to the point of blocking the gap, the gas in the high-pressure chamber 15 will not be able to leak, and the piston 3 will stop descending. In this way, the distance sensor 12 judges its distance relative to the distance of the piston 3 inside the engine block 9, and can determine the height position where the piston 3 suddenly stops descending. This height is the approximate height where the gap exists. It is only necessary to check the inner wall around this height inside the cylinder bore 4.

[0035] Example 2: Figure 3 As shown, assuming there are two gaps at different heights inside the cylinder bore 4, the piston 3 descends at a certain speed during normal descent. For example, if the piston 3 is found to descend 1cm every 10s, the first speed is 0.1cm / s. When the piston 3 blocks the upper gap, allowing air to escape only through the lower gap, the gap decreases, and therefore the descent speed of the piston 3 decreases. For example, if the piston 3 is found to descend 0.5cm every 10s, the second speed is 0.05cm / s. The position where the speed changes is the position of the first gap. The second gap needs to be detected by the distance sensor 12 to indicate that the piston 3 has stopped descending.

[0036] Example 3: Figure 3As shown, assuming there are three gaps of different heights within the cylinder bore 4, the sum of the two upper gaps is greater than the upper gap in Example 2, but each individual gap is smaller than the gap in Example 2. In this case, the initial descent speed of piston 3 will be greater than that of piston 3 in Example 2. After the uppermost gap is blocked by piston 3, the number of pistons 3 will be less than the initial descent speed of piston 3 in Example 2. If the sum of the two upper gaps is less than the upper gap in Example 2, the initial descent speed of piston 3 will be less than that of piston 3 in Example 2. This allows us to compare the ratio of the sum of the gaps of different heights within the cylinder bore 4.

[0037] Therefore, this invention only needs to detect the change in the descending speed of the piston 3 inside the cylinder bore 4 under test by using the distance sensor 12 to roughly determine the relative height of the gap on the cylinder bore 4. Later, it is only necessary to detect the range of the speed change within this height circle. At the same time, it can also determine the relative value of the size of the gap at each height. It can not only determine whether there is a leakage gap in the cylinder bore 4 of the engine cylinder under test, but also roughly determine the location of the leakage gap. At the same time, it can also determine whether there is a leak in the intake passage 7 and the exhaust passage 8 based on the first electronic pressure gauge 146 and the second electronic pressure gauge 147, so that there will be no problem of confusion between the intake passage 7, the exhaust passage 8 and the cylinder bore 4 leakage.

[0038] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application.

Claims

1. An engine block test platform for air tightness testing of an engine block (1) under test, comprising a base (2), on which the engine block (1) under test is placed, the engine block (1) under test comprising a plurality of cylinder bores (4) for pistons (3) to slide, and further comprising a plurality of intake passages (7) and exhaust passages (8) for intake valves (5) and exhaust valves (6) to be installed, wherein one cylinder bore (4) corresponds to at least one intake passage (7) and one exhaust passage (8), characterized in that: The base (2) holds a comparison engine cylinder (9) that is identical to and has passed the test of the engine cylinder block (1) to be tested. An XY axis moving module (10) is installed on the base (2). A rotating module (11) is installed on the output end of the XY axis moving module (10). A distance sensor (12) for detecting the height of the piston (3) is installed on the rotating module (11). An air injection module (13) is installed outside the base (2). A sealed pipe (14) for injecting air into the intake channel (7) and exhaust channel (8) is installed on the output end of the air injection module (13). 4) Includes a main pipe (141) installed on the output end of the air injection module (13), an air intake pipe (142) installed between the main pipe (141) and the air intake channel (7), and an exhaust pipe (143) installed between the main pipe (141) and the exhaust channel (8). A first solenoid valve (144) and a second solenoid valve (145) are fixedly installed on the air intake pipe (142) and the exhaust pipe (143), respectively. A first electronic pressure gauge (146) and a second electronic pressure gauge (147) are fixedly installed on the air intake pipe (142) and the exhaust pipe (143), respectively. The air injection module (13) injects air into the cylinder bore (4) of the test engine block (1) and the comparison engine block (9) through the sealed pipe (14) to push the piston (3) away from the intake valve (5), so that a high-pressure chamber (15) is formed in the cylinder bore (4). After the air injection is stopped, the rate of descent of the piston (3) in the test engine block (1) relative to the piston (3) in the comparison engine block (9) is detected at regular intervals to roughly infer the vertical height of the leakage point in the cylinder bore (4) within the cylinder bore (4).

2. The engine block testing platform according to claim 1, characterized in that: A vent valve (148) is also installed on the main pipe (141).

3. The engine block testing platform according to claim 1, characterized in that: When the number of pistons (3) in the engine cylinder block (1) under test is set to N, the distance sensors (12) are set to N+1. The N distance sensors (12) respectively detect the real-time distance of the N pistons (3) in the engine cylinder block (1) under test, and one distance sensor (12) detects the real-time distance of one piston (3) in the engine cylinder block (9) under comparison.

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