Engine rust prevention test method and system
By circulating anti-rust liquid in the engine water circuit and judging the running-in based on the bubbling status, and conducting long-term tests under simulated storage conditions, the problem of the existing technology that cannot comprehensively evaluate the anti-rust performance of the entire engine is solved, and more complete and accurate anti-rust test results are achieved.
Patent Information
- Application Number
- CN202510887855.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-09-16
AI Technical Summary
Existing engine anti-rust test methods cannot comprehensively evaluate the anti-rust performance of the entire engine, and the test time is short or does not simulate actual working conditions, resulting in inaccurate test results.
The engine water circuit is filled with anti-rust liquid and circulated. After the running-in is completed, it is judged by idling and bubbling status. Then a long-term test is carried out simulating storage conditions. The anti-rust performance is evaluated by detecting whether the key parts of the engine are rusted.
Comprehensive anti-rust verification of the entire engine has been achieved, the test process is more complete, the results are more accurate, the risk of misjudgment is reduced, and the accuracy of anti-rust performance evaluation is improved.
Smart Images
Figure CN120651742A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to engine testing, and more particularly to an engine anti-rust testing method and system. Background Art
[0002] With the rapid development of the automobile industry, the performance and durability of the engine, as a core component of the automobile, have become the focus of user attention. Engine anti-rust testing is an important means of evaluating the corrosion resistance of the engine and its components, and is crucial to ensuring the reliability and service life of the engine. Currently, the testing of engines mostly adopts the immersion corrosion method or the salt spray test method. Among them, the immersion corrosion method usually takes samples from different material parts on the engine, and then immerses these samples in a corrosive solution according to a set immersion time. However, this method cannot reflect the rust resistance of the entire machine. The salt spray test method sets the salt spray concentration, spray time and temperature according to the standard, and conducts the test according to the set time. It realizes the rust resistance test of the entire machine, but the test time of this test method is short, and it does not simulate actual multi-environmental working conditions. Therefore, it can only characterize the rust resistance performance of the engine in a short period of time. Therefore, in response to the existing problems in engine anti-rust testing, the present invention proposes an engine anti-rust test method and system. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide an engine anti-rust test method and system in response to the deficiencies of the existing technology, which meets the anti-rust test verification of the entire engine, and the test process is more complete and in line with actual storage conditions, and the test results are more accurate.
[0004] The present invention provides an engine rust prevention test method, which comprises:
[0005] The first step is to select anti-rust liquid;
[0006] The second step is to fill the water channel of the engine to be tested with the rust-proof liquid, and connect the water channel of the engine to be tested with the rust-proof liquid circulation water channel;
[0007] Step 3: Start the engine to be tested, and circulate the rust-proof liquid in the water path of the engine to be tested and the rust-proof liquid in the rust-proof liquid circulation water path to run-in the engine to be tested and the rust-proof liquid;
[0008] Step 4: After the engine to be tested and the rust preventive liquid have been run-in, the engine to be tested is restored and packaged according to the factory packaging requirements of the engine;
[0009] Step 5: Place the packaged engine in a storage condition for rust prevention test, obtain test results at a set test cycle, and determine whether the engine has passed the rust prevention test based on the test results.
[0010] Preferably, in the second step, the specific method of filling the water channel of the engine to be tested with the rust-proof liquid is:
[0011] The engine to be tested is placed on a test bench and the oil and gas lines are connected. Then, the thermostat of the engine to be tested is removed and the thermostat cover is reinstalled. The anti-rust liquid is poured from the thermostat opening until the water line of the engine to be tested is filled.
[0012] Preferably, the method for determining whether the water channel of the engine to be tested is full is:
[0013] When the rust-proof liquid flows out of the degassing pipe of the engine to be tested, it is determined that the inner cavity of the water channel of the engine to be tested has been filled with the rust-proof liquid.
[0014] Preferably, in the third step, the engine to be tested is started and then runs at idle speed.
[0015] Preferably, in the fourth step, the method for determining whether the running-in of the engine to be tested and the rust preventive liquid is completed is:
[0016] Monitoring whether the temperature of the rust-preventive liquid reaches a set target temperature. If so, stopping the operation of the engine under test and simultaneously obtaining the bubbling state of the rust-preventive liquid in the rust-preventive liquid circulation water path. If the bubbling state of the rust-preventive liquid is greater than a set bubbling threshold, re-executing the second step after the temperature of the rust-preventive liquid returns to room temperature. If the bubbling state of the rust-preventive liquid is less than or equal to the set bubbling threshold, determining that the engine under test and the rust-preventive liquid have completed running-in.
[0017] Preferably, the bubbling state is the foam coverage area at the rust-proof liquid collection point in the rust-proof liquid circulation water channel after a set time period after the engine to be tested is shut down, and the bubbling threshold is the foam coverage area at the rust-proof liquid collection point in the rust-proof liquid circulation water channel when the engine to be tested is shut down.
[0018] Preferably, the target temperature is 85°C to 95°C.
[0019] Preferably, in the fifth step, when each of the detection cycles is reached, the thermostat and oil cooler of the engine to be tested are disassembled, and they are inspected for rust, and the detection data is recorded at the same time; and in the last detection cycle, the cylinder head of the engine to be tested is disassembled again to inspect whether the water holes of the engine body and the water holes of the cylinder head of the engine to be tested are rusted, and the detection data is recorded at the same time.
[0020] Preferably, when each detection cycle arrives, the rust-proof liquid is sampled from the inner cavity of the engine to be tested, and the physical state of the rust-proof liquid is tested to determine whether the rust-proof liquid is suitable for the current model of the engine.
[0021] An engine anti-rust test system includes a test bench, an industrial computer, and an anti-rust liquid circulating water circuit consisting of an anti-rust liquid storage barrel, a water inlet pipe, and a water return pipe. The engine to be tested is placed on the test bench, the water circuit water inlet interface of the engine to be tested is connected to the anti-rust liquid storage barrel via the water inlet pipe, the water circuit outlet of the engine to be tested is connected to the anti-rust liquid storage barrel via the water return pipe, and a temperature sensor is installed at the water circuit outlet of the engine to be tested. The industrial computer is used to collect data generated by the engine to be tested during the test process and apply the engine anti-rust test method to determine whether the engine passes the anti-rust test.
[0022] Beneficial effects
[0023] The advantages of the present invention are:
[0024] 1. By circulating the anti-rust liquid in the water circuit of the engine to be tested, the anti-rust environment inside the engine is made uniform. Then the engine is installed and packaged according to the packaging requirements before undergoing an anti-rust test under storage conditions. This method can not only well reflect the anti-rust verification of the engine, but also meet the anti-rust test verification of the entire engine. The test process is more complete and fits the actual storage conditions, and the test results are more accurate.
[0025] 2. The present invention cleverly utilizes the bubbling state to determine whether the engine cavity is in full contact with the anti-rust liquid, which greatly reduces the risk of misjudgment and improves the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 Schematic diagram of the engine rust prevention test method of the present invention;
[0027] Figure 2 A comparison diagram of metal test pieces for the multi-metal corrosion test of the present invention;
[0028] Figure 3 A comparison diagram of metal test pieces used in the vapor phase rust inhibitor test of the present invention;
[0029] Figure 4 A comparison diagram of metal test pieces for the basic anti-rust test of the present invention;
[0030] Figure 5 1. A comparison diagram before and after the cylinder head test of the present invention;
[0031] Figure 6 This is a comparison chart of the internal test results of the thermostat of the present invention;
[0032] Figure 7 This is a comparison chart of internal test results of the oil cooler of the present invention;
[0033] Figure 8This is a comparison chart of the refractometer concentration percentages of the present invention. DETAILED DESCRIPTION
[0034] The present invention will be further described below in conjunction with the embodiments, but this does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.
[0035] See Figure 1 The present invention provides an engine rust prevention test method, which comprises the following steps:
[0036] The first step is to select the anti-rust liquid. You can use the anti-rust liquid that corresponds to the engine model, or you can obtain it through the following test method.
[0037] Specifically, prepare a variety of anti-rust liquids and perform the following tests:
[0038] 1.1 Multi-metal corrosion test
[0039] 1.1.1 Material preparation:
[0040] a. Heating device: can heat the water temperature to a stable level of (80-100)℃;
[0041] b. Beaker;
[0042] c. Test pieces: 1 each of casting sample, aluminum sample, zinc sample and copper sample.
[0043] 1.1.2 Test plan:
[0044] a. Take photos of all test pieces and anti-rust liquid to confirm the initial color;
[0045] b. Place all test pieces in a beaker and add anti-rust liquid until all test pieces are covered. Heat the beaker and maintain the temperature at 90±1℃. Take a picture of the liquid color in the beaker every 30 minutes for 8 hours. The main purpose is to check whether the anti-rust liquid will react with the metal of the engine when heated during the test.
[0046] 1.1.3 Output results:
[0047] a. The anti-rust liquid must not change color or fade during the entire process;
[0048] b. The test piece did not change color or fade during the entire experiment (it is normal for aluminum parts to turn black).
[0049] The following table shows the test results of four anti-rust liquid samples:
[0050] Table 1 - Multi-metal corrosion test results
[0051]
[0052] like Figure 2 As shown, Figure 2 The following are photos of Sample 1 before and after the experiment. A comparison of the photos shows that the rust preventative solution did not corrode the sample metal in the metal corrosion experiment, meeting the two output results in 1.1.3 above and allowing the next test to proceed. However, if these results are not met, the rust preventative solution that does not meet the test results will be eliminated.
[0053] 1.2 Vapor phase rust inhibitor test
[0054] 2.2.1 Material preparation:
[0055] a. One each of brass H62, stainless steel 304, carbon steel specimen 10 steel, cast iron specimen 300, and aluminum specimen ZL107. Standard specimen size: 50X25X2 (mm);
[0056] b. Heating device: can heat the water temperature to a stable level of (80-100)℃;
[0057] c. Beaker.
[0058] 1.2.2 Test plan:
[0059] a. Take photos of all test pieces to confirm the initial color;
[0060] b. Pour the anti-rust liquid into a beaker and hang the test piece on the beaker without contact with the anti-rust liquid. Heat the anti-rust liquid to 90±1℃ for 8 hours and observe whether the metal test piece changes color. The main purpose is to observe whether the anti-rust liquid evaporates after the test piece has been soaked in the anti-rust liquid and whether it has the ability to prevent rust.
[0061] 1.2.3 Output results:
[0062] a. Take photos of the test piece after completion, and ensure that no rust is produced on the test piece.
[0063] The following table shows the test results of four anti-rust liquid samples:
[0064] Table 2 - VPI test results
[0065]
[0066] Figure 3 The photos of sample 1 before and after the experiment are shown in Figure 1. Figure 3 It can be seen that the test results meet the output results of 1.2.3 above, and the next test can be performed. However, if they do not meet the requirements, the anti-rust liquid that does not meet the test results will be eliminated.
[0067] 1.3 Basic anti-rust test
[0068] 1.3.1 Material preparation:
[0069] a. One each of brass H62, stainless steel 304, carbon steel specimen 10 steel, cast iron specimen 300, and aluminum specimen ZL107. Standard specimen size: 50X25X2 (mm);
[0070] b. Heating device: can heat the water temperature to a stable level of (80-100)℃;
[0071] c. Beaker.
[0072] 1.3.2 Test plan:
[0073] a. Take photos of all test pieces to confirm the initial color;
[0074] b. Heat the rust preventative solution to 90±1°C and immerse the test piece in the solution for 2-3 minutes. Pour tap water into a beaker and hang the test piece over the beaker, away from the tap water. Observe for one month. This is to conduct a preliminary test of the rust preventative solution's rust prevention capabilities. Additionally, for added contrast, a group of metal test pieces were suspended while immersed in clean water.
[0075] 1.3.3 Output results:
[0076] a. Take photos of the test piece after completion, and ensure that no rust is produced on the test piece.
[0077] The following table shows the test results of four anti-rust liquid samples:
[0078] Table 3 - Basic anti-rust test results
[0079]
[0080] Figure 4 The photos of sample 1 before and after the experiment are shown in Figure 1. Figure 4 As can be seen, the test results of the metal test piece immersed in the rust-proof liquid meet the output results of 1.3.3 above, and the next test can be performed. However, the metal test piece immersed in clean water has some rust, which also proves the rust-proof performance of the rust-proof liquid.
[0081] 1.4 Physical Test 1: Cylinder Head Test
[0082] 1.4.1 Material preparation:
[0083] a. One engine cylinder head.
[0084] 1.4.2 Experimental plan
[0085] a. Take photos of all cylinder heads to confirm their initial colors;
[0086] b. Soak the engine cylinder head in the anti-rust liquid for 10-15 minutes, take it out and place it in a cool place, and wrap it with a waterproof cover. Observe it once a month for 3 months, mainly to observe the basic anti-rust ability of the anti-rust liquid.
[0087] 1.4.3 Output
[0088] a. Take a photo of the cylinder head after completion, and ensure that there is no rust on the cylinder head.
[0089] The following table shows the test results of four anti-rust liquid samples:
[0090] Table 4 - Cylinder head test results
[0091]
[0092] Figure 5 The photos of sample 1 before and after the experiment are shown in Figure 1. Figure 5 It can be seen that if the test results of the metal test piece immersed in the anti-rust liquid meet the output results of the above 1.4.3, the next test will be performed, otherwise the anti-rust liquid will be eliminated.
[0093] 1.5 Physical Test 2: Cooler Test
[0094] 1.5.1 Material preparation:
[0095] a. One oil cooler: split oil cooler (S04, S06).
[0096] 1.5.2 Experimental plan
[0097] a. Take a photo of the anti-rust liquid to confirm the initial color;
[0098] b. Pour the anti-rust liquid into the cooler, fill the cooler, and observe for one week.
[0099] 1.5.3 Output
[0100] a. After one week, observe whether the color of the anti-rust liquid changes and whether the cooler has verdigris.
[0101] Finally, the test shows that the four anti-rust liquid samples all meet the output results of the above 1.5.3, so these anti-rust liquid samples are used to proceed to the next step.
[0102] However, the copper element in the oil cooler is an active metal and easily reacts with the rust preventive liquid. The one-week test time is shorter than the actual storage time of the engine. Therefore, this cooler test is an optional test, that is, the actual test 2 can be ignored. It will be included in the subsequent whole machine test, and the test results will be more accurate.
[0103] The second step is to fill the engine's water circuit with rust-proof liquid and connect it to the rust-proof liquid circulation circuit. The rust-proof liquid circulation circuit consists of a rust-proof liquid storage tank, an inlet pipe, and a return pipe. The rust-proof liquid storage tank must contain at least 75 kg of rust-proof liquid. Before filling the rust-proof liquid, place the engine on the test bench and connect the oil and air lines. Remove the thermostat and replace the thermostat cover. Fill the engine's water circuit with rust-proof liquid from the thermostat opening until the engine's water circuit is completely filled.
[0104] In this embodiment, the engine's external water circuit test relies on the engine's built-in water pump to pump water. However, the pump's ability to pump water requires that the engine's water circuit be filled with rust-inhibiting fluid. Furthermore, the thermostat typically opens only when the water temperature reaches 85°C or above; it will not open at room temperature, preventing the water circuit from being filled with rust-inhibiting fluid. Therefore, the thermostat must be removed. At room temperature, rust-inhibiting fluid is manually added to fill the engine's water circuit, and the thermostat cap is reinstalled to facilitate water pipe connection.
[0105] In this embodiment, the engine's water channel is fully filled when anti-rust liquid flows out of the degassing pipe. The degassing pipe is the highest point in the engine's water channel. Only when anti-rust liquid flows out of the degassing pipe does the engine's water channel become fully filled, indicating that the engine's water channel is fully filled. The water pump can then be activated to pump the anti-rust liquid.
[0106] The third step is to start the engine under test and circulate the anti-rust liquid in the engine's water circuit with the anti-rust liquid in the anti-rust liquid circulation circuit to run-in the engine and the anti-rust liquid. After starting, the engine under test runs at idle speed and remains at idle speed throughout the test. Because only the water pump is running during the test, with no other power output, idling is sufficient to circulate the anti-rust liquid in the water circuit.
[0107] Step 4: After the engine to be tested and the rust preventive liquid have been run-in, the engine to be tested is restored and packaged according to the factory packaging requirements of the engine.
[0108] The method for determining whether the running-in of the engine to be tested and the rust preventive liquid is completed is as follows:
[0109] Monitor whether the temperature of the rust-proof liquid has reached the set target temperature. In this embodiment, the target temperature is selected as 90°C. Since this system does not use a cooling system, the main reason for shutting down when the rust-proof liquid temperature reaches 90°C is to prevent the temperature from continuing to rise, causing the engine to scuff. If the temperature of the rust-proof liquid reaches 90°C, the operation of the engine to be tested is stopped, and the bubbling status of the rust-proof liquid in the rust-proof liquid circulation water circuit is obtained at the same time. If the bubbling status of the rust-proof liquid is greater than the set bubbling threshold, the second step is repeated after the temperature of the rust-proof liquid returns to room temperature. If the bubbling status of the rust-proof liquid is less than or equal to the set bubbling threshold, it is determined that the running-in of the engine to be tested and the rust-proof liquid is complete.
[0110] Even if the engine is filled with rust-proof liquid, due to the influence of the doping gas, some parts of the engine cavity may still not be able to contact the rust-proof liquid, so these parts are reduced through circulation. In addition, if a large amount of bubbling occurs during the circulation process, the bubbles existing in the surface engine cavity are discharged, and the rust-proof liquid contacts the engine cavity more fully. Correspondingly, if a large amount of bubbles are still discharged after the shutdown, it means that there are still more gas bubbles in the engine cavity when the shutdown occurs. If the next step is executed at this time, the engine cavity isolated by the gas bubbles is more likely to rust, which will lead to subsequent misjudgment. Therefore, the present invention cleverly uses the bubbling state to judge whether the engine cavity is in full contact with the rust-proof liquid, which greatly reduces the risk of misjudgment and improves the accuracy of the test.
[0111] In this embodiment, the bubbling state is defined as the area of foam coverage at the point where the rust-proof liquid collects in the rust-proof liquid circulation circuit after a set period of time has passed since the engine under test was shut down. The bubbling threshold is defined as the area of foam coverage at the point where the rust-proof liquid collects in the rust-proof liquid circulation circuit when the engine under test is shut down. Since the bubbling phenomenon manifests itself on the surface of the rust-proof liquid storage tank, simply capturing images of the rust-proof liquid storage tank surface at the corresponding time points and then using existing image processing techniques to quickly identify the foam coverage area in the images can be used to compare the foam coverage areas. The degree of running-in between the engine under test and the rust-proof liquid can then be determined quickly and easily.
[0112] Once the engine is deemed run-in complete, the piping can be removed and the thermostat reinstalled to complete the engine's restoration. The engine is then packaged in waterproof bags and iron frames and sealed as shipped from the on-site sales machine. No special treatment is required, and no full sealing is required. This is to simulate the engine's weakest protection, exposed to the sun, wind, and rain during storage (mostly in open-air environments), to see if the rust-preventive fluid can continue to prevent rust from forming within the engine's waterways.
[0113] Step 5: Place the packaged engine in a storage condition for rust prevention test, obtain test results at a set test cycle, and determine whether the engine has passed the rust prevention test based on the test results.
[0114] Specifically, the rust prevention condition can be observed every three months. That is, every three months, the thermostat and oil cooler of the engine to be tested are disassembled and tested for rust, and the test data is recorded. Figure 6 and Figure 7 The following are the internal test photos of the thermostat and oil cooler in the 3rd and 6th months of the test respectively. Figure 6 It can be seen that the anti-rust liquid of sample 3 has been seriously rusted in the third month of the test, so it has withdrawn from the verification, while the tests of the remaining samples are in normal state. Figure 7 It can be clearly seen that through the test of sample 1, the oil cooler has patina after 6 months of testing, and its sample results are not as good as those of sample 2 and sample 4.
[0115] At the end of the last inspection cycle, that is, one year, in addition to inspecting the thermostat and oil cooler, the cylinder head of the engine to be tested must be disassembled to inspect the water holes in the engine body and cylinder head for rust, and the inspection data must be recorded.
[0116] In addition, at the arrival of each test cycle, the anti-rust liquid is sampled from the inner cavity of the engine to be tested, and the physical state of the anti-rust liquid is tested to determine whether the anti-rust liquid is suitable for the current model of engine. Specifically, the physical state of the anti-rust liquid is mainly whether its color has changed and whether its refractive index concentration meets the requirements. That is, the color of the anti-rust liquid and the refractometer concentration percentage before and after the experiment are compared respectively. If any physical state does not meet the target requirements, it means that this type of anti-rust liquid does not meet the anti-rust requirements. Figure 8 is the refractometer concentration percentage of the three anti-rust liquid samples before and after the test, from Figure 8 It can be seen that the refractometer concentration percentage of sample 2 is lower after the test than before the test, but it is still within the controllable range.
[0117] The above test demonstrates the impact of different manufacturers' and models' rust-preventive fluids on the engine's overall rust-preventive performance. Furthermore, by disassembling the engine and inspecting its internal cavity, it can effectively determine whether the engine has passed the rust-preventive test. This allows for more accurate verification of the engine's rust-preventive performance and the optimal rust-preventive fluid to match it, significantly improving the engine's rust-preventive performance during subsequent storage, transportation, and use. Compared to traditional immersion corrosion and salt spray tests, the present test method is more comprehensive, aligns with actual storage conditions, and provides more accurate test results.
[0118] An engine anti-rust test system includes a test bench and an anti-rust liquid circulation water circuit consisting of an anti-rust liquid storage barrel, a water inlet pipe, and a return pipe. During a specific test, 100L of anti-rust liquid is injected into the anti-rust liquid storage barrel. The engine to be tested is placed on the test bench and connected to the pipeline and air circuit. The water inlet interface of the engine to be tested is connected to the anti-rust liquid storage barrel via the water inlet pipe, and the water outlet of the engine to be tested is connected to the anti-rust liquid storage barrel via the return pipe. A temperature sensor is installed at the water outlet of the engine to be tested. An industrial computer is used to collect temperature data, image data, and other data generated by the engine to be tested during the test, and apply the engine anti-rust test method to determine whether the engine has passed the anti-rust test.
[0119] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.
Claims
1. An engine anti-rust test method, characterized in that: The method is: The first step is to select anti-rust liquid; The second step is to fill the water channel of the engine to be tested with the rust-proof liquid, and connect the water channel of the engine to be tested with the rust-proof liquid circulation water channel; Step 3: Start the engine to be tested, and circulate the rust-proof liquid in the water path of the engine to be tested and the rust-proof liquid in the rust-proof liquid circulation water path to run-in the engine to be tested and the rust-proof liquid; Step 4: After the engine to be tested and the rust preventive liquid have been run-in, the engine to be tested is restored and packaged according to the factory packaging requirements of the engine; Step 5: Place the packaged engine in a storage condition for rust prevention test, obtain test results at a set test cycle, and determine whether the engine has passed the rust prevention test based on the test results.
2. The engine anti-rust test method according to claim 1, characterized in that: In the second step, the specific method of filling the water channel of the engine to be tested with the rust-proof liquid is as follows: The engine to be tested is placed on a test bench and the oil and gas lines are connected. Then, the thermostat of the engine to be tested is removed and the thermostat cover is reinstalled. The anti-rust liquid is poured from the thermostat opening until the water line of the engine to be tested is filled.
3. The engine anti-rust test method according to claim 2, characterized in that: The method for determining whether the water channel of the engine to be tested is full is: When the rust-proof liquid flows out of the degassing pipe of the engine to be tested, it is determined that the inner cavity of the water channel of the engine to be tested has been filled with the rust-proof liquid.
4. The engine anti-rust test method according to claim 1, characterized in that: In the third step, the engine to be tested is started and runs at idle speed.
5. The engine anti-rust test method according to claim 1, characterized in that: In the fourth step, the determination method of whether the running-in of the engine to be tested and the rust preventive liquid is completed is as follows: Monitoring whether the temperature of the rust-preventive liquid reaches a set target temperature. If so, stopping the operation of the engine under test and simultaneously obtaining the bubbling state of the rust-preventive liquid in the rust-preventive liquid circulation water path. If the bubbling state of the rust-preventive liquid is greater than a set bubbling threshold, re-executing the second step after the temperature of the rust-preventive liquid returns to room temperature. If the bubbling state of the rust-preventive liquid is less than or equal to the set bubbling threshold, determining that the engine under test and the rust-preventive liquid have completed running-in.
6. The engine anti-rust test method according to claim 5, characterized in that: The bubbling state is the foam coverage area at the rust-proof liquid collection point in the rust-proof liquid circulation waterway after a set time period after the engine to be tested is shut down. The bubbling threshold is the foam coverage area at the rust-proof liquid collection point in the rust-proof liquid circulation waterway when the engine to be tested is shut down.
7. An engine anti-rust test method according to claim 6, characterized in that: The target temperature is 85°C to 95°C.
8. The engine anti-rust test method according to claim 1, characterized in that: In the fifth step, when each test cycle is reached, the thermostat and oil cooler of the engine to be tested are disassembled and tested for rust, and the test data are recorded. In the last test cycle, the cylinder head of the engine to be tested is disassembled to test whether the water holes of the engine body and the water holes of the cylinder head of the engine to be tested are rusted, and the test data are recorded.
9. An engine anti-rust test method according to claim 8, characterized in that: When each detection cycle arrives, the anti-rust liquid is sampled from the inner cavity of the engine to be tested, and the physical state of the anti-rust liquid is detected to determine whether the anti-rust liquid is suitable for the current model of the engine.
10. An engine anti-rust test system, characterized in that: The invention comprises a test bench, an industrial computer and an anti-rust liquid circulation water circuit consisting of an anti-rust liquid storage barrel, a water inlet pipe and a return pipe; the engine to be tested is placed on the test bench, the water inlet interface of the engine to be tested is connected to the anti-rust liquid storage barrel through the water inlet pipe, the water outlet of the engine to be tested is connected to the anti-rust liquid storage barrel through the return pipe, and a temperature sensor is installed at the water outlet of the engine to be tested; the industrial computer is used to collect data generated by the engine to be tested during the test process, and apply the engine anti-rust test method according to any one of claims 1 to 9 to determine whether the engine passes the anti-rust test.