Detection method and system for heavy-load engine coolant cavitation erosion bench test

Abstract

The invention belongs to the technical field of engine detection, and particularly relates to a detection method and system for a heavy-load engine coolant cavitation erosion bench test, and the detection method comprises the following steps: S1, injecting a coolant and engine oil into an engine, starting the engine, and carrying out the running-in of the engine; s2, after engine running-in is completed, testing cooling liquid and testing engine oil are injected into the engine after running-in, the engine is started, and cooling liquid running-in is conducted; s3, after cooling liquid running-in is completed, cooling liquid circulation is conducted; s4, after circulation of the cooling liquid is completed, a cylinder sleeve of the engine is disassembled; and S5, counting the number of the corrosion spots on the engine cylinder sleeve, and judging whether the test cooling liquid is qualified or not according to the counting result of the number of the corrosion spots. According to the invention, the vacancy of an engine pedestal detection method for cavitation corrosion of inorganic and organic engine coolant products at present is filled up, and an earlier-stage research foundation is laid for subsequent improvement of the standard technical level of the engine coolant products.

Description

Technical Field

[0001] The invention belongs to the technical field of engine detection, and in particular relates to a detection method and system for a heavy-load engine coolant cavitation bench test. Background Art

[0002] Motor vehicle engine coolant (hereinafter referred to as "coolant") products are divided into light-load engine coolant and heavy-load engine coolant according to the type of engine used, and are divided into three categories according to the main ingredients of product additives: inorganic, semi-organic, and fully organic. At that time, considering factors such as the proportion of organic (semi-organic and fully organic) engine coolant products and the maturity and perfection of the test methods, the test items for heavy-load engine coolants only included items for determining the content of nitrite and molybdate components in inorganic coolants, and there were no test requirements for organic (semi-organic and fully organic) engine coolants. With the rapid development of the automobile industry and engine technology and the continuous improvement of environmental protection requirements, the proportion of organic (semi-organic and fully organic) engine coolants has increased rapidly. Therefore, a test method for heavy-load engine coolants is urgently needed to fill the gap in engine bench test methods for heavy-load (inorganic and organic) engine coolants. Summary of the invention

[0003] The purpose of the present invention is to provide a detection method and system for a heavy-load engine coolant cavitation bench test, so as to fill the blank of the heavy-load engine coolant cavitation bench test detection method.

[0004] To achieve the above object, the present invention provides the following scheme: a detection method for a heavy-load engine coolant cavitation bench test, comprising the following steps:

[0005] S1. Inject coolant and engine oil into the engine, start the engine, and perform engine running-in;

[0006] S2. After the engine running-in is completed, inject the test coolant and test engine oil into the engine after running-in, start the engine, and perform coolant running-in;

[0007] S3. After the coolant running-in is completed, the coolant is circulated;

[0008] S4. After the coolant circulation is completed, the cylinder liner of the engine is disassembled;

[0009] S5. Count the number of corrosion points on the engine cylinder liner, and determine whether the test coolant is qualified based on the statistical result of the number of corrosion points.

[0010] Preferably, the parameters of engine running-in and coolant running-in include stage duration, speed, torque, external coolant temperature, fuel temperature, supercharger intake temperature, intake manifold temperature, and exhaust pressure.

[0011] Preferably, the parameters of the coolant circulation include stage duration, speed, power, torque, intake manifold temperature, coolant outlet temperature, fuel temperature, supercharger inlet temperature, and exhaust pressure.

[0012] Preferably, the coolant running-in time is 20 hours, and the coolant circulation time is 230 hours.

[0013] Preferably, in S2, engine heat treatment is performed after the engine running-in is completed and before the coolant running-in.

[0014] Preferably, the engine thermal parameters include stage duration, speed, torque, external coolant temperature, and intake manifold temperature.

[0015] A detection system for a heavy-load engine coolant cavitation bench test, used to implement a detection method for a heavy-load engine coolant cavitation bench test, comprising:

[0016] engine;

[0017] A coolant circulation cooling mechanism is connected to the engine, and is used to drive the test coolant to circulate in the engine and to cool the test coolant after it flows out of the engine;

[0018] A supercharging mechanism, connected to the engine, and used to introduce air into the engine;

[0019] A dynamometer is drivingly connected to the engine, and the dynamometer is used to drive the engine.

[0020] Preferably, the coolant circulation cooling mechanism includes a coolant storage tank, the outlet end of the coolant storage tank is connected to the liquid inlet end of the engine through a liquid inlet pipe, the inlet end of the coolant storage tank is connected to the liquid outlet end of the engine through a liquid outlet pipe, and a coolant radiator is commonly provided on the liquid inlet pipe and the liquid outlet pipe.

[0021] Preferably, the boosting mechanism comprises a supercharger, an air inlet of the supercharger is connected to the outside air, an air outlet of the supercharger is connected to the air inlet end of the engine, and an air outlet end is provided on the engine.

[0022] Preferably, the engine is transmission-connected to the dynamometer via a driving bearing, and a fuel consumption meter is also provided on the engine.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] The present invention fills the gap in the current engine bench detection method for cavitation corrosion of inorganic and organic (semi-organic and fully organic) engine coolant products, and lays a preliminary research foundation for the subsequent improvement of the standard technical level of engine coolant products. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0026] Figure 1 It is a flow chart of the detection method of the present invention;

[0027] Figure 2 Schematic diagram of the detection system of the present invention.

[0028] Among them, 1. Engine; 2. Drive bearing; 3. Dynamometer; 4. Intake air cooler; 5. Supercharger; 6. Coolant radiator; 7. Coolant storage tank; 8. Fuel consumption meter. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1 to Figure 2 As shown, the present invention provides a detection method for a heavy-load engine coolant cavitation bench test, comprising the following steps:

[0032] S1. Inject coolant and engine oil into the engine, start the engine, and perform engine running-in;

[0033] Install a new coolant filter and a new oil filter on the engine, then inject a certain amount of coolant with a specified concentration and a certain amount of oil, then start the engine for running-in. The range of engine running-in parameters is:

[0034]

[0035] S2. After the engine running-in is completed, inject the test coolant and test engine oil into the engine after running-in, start the engine, and perform coolant running-in;

[0036] After the engine running-in is completed, a certain amount of test coolant with a fixed concentration and a certain amount of engine oil are injected into the system. The range of coolant running-in parameters is:

[0037] parameter unit stage Phase duration H 20 Speed r / min 2100±10 Torque N·m 766±5 External coolant temperature ℃ 70±2 Fuel temperature ℃ 40±2 Supercharger intake air temperature ℃ 30±2 Intake manifold temperature ℃ 100±2 Exhaust pressure kPa 3.5±2

[0038] S3. After the coolant running-in is completed, the coolant is circulated; the range of the coolant circulation parameters is:

[0039]

[0040]

[0041] The torque, intake manifold temperature, coolant outlet temperature, and supercharger inlet temperature in the coolant circulation parameter value range are all preset values ​​and can be changed according to actual circulation conditions.

[0042] S4. After the coolant circulation is completed, the cylinder liner of the engine is disassembled;

[0043] S5. Count the number of corrosion points on the engine cylinder liner, and determine whether the test coolant is qualified based on the statistical result of the number of corrosion points.

[0044] The disassembled cylinder sleeve of engine 1 is counted on a microscope to determine the number of corrosion points. If the number of corrosion points is less than or equal to N, the coolant of engine 1 is qualified; if the number of corrosion points is greater than N, the coolant of engine 1 is unqualified.

[0045] To further optimize the scheme, the parameters for engine running-in and coolant running-in include stage duration, speed, torque, external coolant temperature, fuel temperature, supercharger intake temperature, intake manifold temperature, and exhaust pressure.

[0046] To further optimize the solution, the parameters of the coolant circulation include stage duration, speed, power, torque, intake manifold temperature, coolant outlet temperature, fuel temperature, supercharger inlet temperature, and exhaust pressure.

[0047] According to the further optimization plan, the coolant running-in time is 20 hours and the coolant circulation time is 230 hours.

[0048] To further optimize the solution, in S2, engine heat treatment is performed after engine running-in is completed and before coolant running-in.

[0049] To further optimize the solution, the engine thermal parameters include stage duration, speed, torque, external coolant temperature, and intake manifold temperature.

[0050] The values ​​of the engine running-in parameters, coolant running-in parameters, and coolant circulation parameters involved in the detection method disclosed in the present invention are only reference values. The parameter value ranges of different engines 1 are different and are subject to actual circumstances.

[0051] A detection system for a heavy-load engine coolant cavitation bench test, used to implement a detection method for a heavy-load engine coolant cavitation bench test, comprising:

[0052] Engine 1;

[0053] A coolant circulation cooling mechanism is connected to the engine 1, and is used to drive the test coolant to circulate in the engine 1 and to cool the test coolant after it flows out of the engine 1;

[0054] A supercharging mechanism, connected to the engine 1, and used for introducing air into the engine 1;

[0055] The dynamometer 3 is transmission-connected to the engine 1 , and is used to drive the engine 1 .

[0056] The torque parameter of the engine 1 is set by the dynamometer 3 .

[0057] According to a further optimization scheme, the coolant circulation cooling mechanism includes a coolant storage tank 7, the outlet end of the coolant storage tank 7 is connected to the liquid inlet end of the engine 1 through a liquid inlet pipe, the inlet end of the coolant storage tank 7 is connected to the liquid outlet end of the engine 1 through a liquid outlet pipe, and a coolant radiator 6 is provided on the liquid inlet pipe and the liquid outlet pipe.

[0058] According to a further optimization scheme, the boosting mechanism includes a supercharger 5, an air inlet of the supercharger 5 is connected to the outside air, an air outlet of the supercharger 5 is connected to the air inlet end of the engine 1, and an air outlet end is provided on the engine 1.

[0059] The supercharger 5 is a turbocharger. An air intake cooler 4 and an air filter are also provided on the air intake port of the supercharger 5. The air filter is an air filter used in heavy-duty engines.

[0060] An exhaust system is provided on the air outlet end of the engine 1 , and the exhaust system is used to provide exhaust gas for the engine 1 .

[0061] According to a further optimized solution, the engine 1 is connected to the dynamometer 3 through a driving bearing 2 , and a fuel consumption meter 8 is also provided on the engine 1 .

[0062] The fuel inlet and outlet positions of the engine 1 are provided with a fuel system, which is used to measure the fuel consumption and control the temperature.

[0063] A control system and a tension sensor are arranged on the dynamometer 3 to control and detect the torque of the dynamometer 3;

[0064] A throttle control sensor is provided on the engine 1 to control and detect the throttle opening and adjust the speed;

[0065] An intake air temperature sensor, an intake manifold temperature sensor, an intake manifold pressure sensor, a supercharger 5 outlet temperature sensor, a supercharger 5 outlet pressure sensor, and an intake air cooler 4 temperature sensor are installed in the intake pipe of the engine 1 to control and detect relevant temperature and pressure parameters;

[0066] A coolant outlet temperature sensor, a coolant temperature sensor, and a coolant pressure sensor are arranged in the coolant circulation cooling mechanism to control and detect the coolant temperature and pressure parameters;

[0067] An exhaust temperature sensor and an exhaust pressure sensor are arranged in the exhaust pipe of the engine 1 to control and detect the exhaust temperature and pressure;

[0068] A fuel temperature sensor and a fuel pressure sensor are arranged on the fuel consumption meter 8 to control and detect the fuel temperature and pressure;

[0069] An oil temperature sensor and an oil pressure sensor are arranged in the oil system of engine 1 to control and detect the oil temperature and pressure;

[0070] The controller is connected to each sensor respectively to control and detect each temperature and pressure parameter.

[0071] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0072] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. A detection method for a heavy-load engine coolant cavitation bench test, characterized in that: The following steps are involved: S1. Inject coolant and engine oil into the engine, start the engine, and perform engine running-in; S2. After the engine running-in is completed, inject the test coolant and test engine oil into the engine after running-in, start the engine, and perform coolant running-in; S3. After the coolant running-in is completed, the coolant is circulated; S4. After the coolant circulation is completed, the cylinder liner of the engine is disassembled; S5. Count the number of corrosion points on the engine cylinder liner, and determine whether the test coolant is qualified based on the statistical result of the number of corrosion points.

2. The detection method of a heavy-load engine coolant cavitation bench test according to claim 1, characterized in that: The parameters for engine running-in and coolant running-in include stage duration, speed, torque, external coolant temperature, fuel temperature, supercharger intake temperature, intake manifold temperature, and exhaust pressure.

3. The detection method of a heavy-load engine coolant cavitation bench test according to claim 1, characterized in that: The parameters of the coolant cycle include stage duration, speed, power, torque, intake manifold temperature, coolant outlet temperature, fuel temperature, supercharger inlet temperature, and exhaust pressure.

4. The detection method of a heavy-load engine coolant cavitation bench test according to claim 1, characterized in that: The coolant running-in time is 20 hours and the coolant circulation time is 230 hours.

5. The detection method of a heavy-load engine coolant cavitation bench test according to claim 1, characterized in that: In S2, the engine is heated up after the engine running-in is completed and before the coolant running-in.

6. The detection method of a heavy-load engine coolant cavitation bench test according to claim 5, characterized in that: Engine thermal parameters include stage duration, speed, torque, external coolant temperature, and intake manifold temperature.

7. A detection system for a heavy-duty engine coolant cavitation bench test, used to implement the detection method for a heavy-duty engine coolant cavitation bench test according to any one of claims 1 to 6, characterized in that: include Engine (1); A coolant circulation cooling mechanism, connected to the engine (1), the coolant circulation cooling mechanism being used to drive the test coolant to circulate in the engine (1) and to cool the test coolant after it flows out of the engine (1); A supercharging mechanism, connected to the engine (1), the supercharging mechanism being used to introduce air into the engine (1); A dynamometer (3) is drivingly connected to the engine (1), and the dynamometer (3) is used to drive the engine (1).

8. A detection system for a heavy-load engine coolant cavitation bench test according to claim 7, characterized in that: The coolant circulation cooling mechanism comprises a coolant storage tank (7), the outlet end of the coolant storage tank (7) is connected to the liquid inlet end of the engine (1) via a liquid inlet pipe, the inlet end of the coolant storage tank (7) is connected to the liquid outlet end of the engine (1) via a liquid outlet pipe, and a coolant radiator (6) is provided on the liquid inlet pipe and the liquid outlet pipe.

9. A detection system for a heavy-load engine coolant cavitation bench test according to claim 7, characterized in that: The supercharging mechanism comprises a supercharger (5), an air inlet of the supercharger (5) is connected to the outside air, an air outlet of the supercharger (5) is connected to the air inlet end of the engine (1), and an air outlet end is provided on the engine (1).

10. A detection system for a heavy-load engine coolant cavitation bench test according to claim 7, characterized in that: The engine (1) is transmission-connected to the dynamometer (3) via a driving bearing (2), and a fuel consumption meter (8) is also provided on the engine (1).

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