Analog simulation method of engine cooling system

Abstract

The invention relates to the technical field of engine cooling systems, and particularly discloses an analog simulation method of an engine cooling system, which comprises the following steps of: constructing a simulation model of the engine cooling system, filling condensate into an expansion tank according to a preset flow speed and preset time, and observing the filling condition of cooling liquid in the engine cooling system, and judging whether the parts in the engine cooling system are filled with the cooling liquid or not, if the parts in the engine cooling system are not filled with the cooling liquid, starting the engine body to enable the cooling liquid to circulate in the engine cooling system, and discharging gas in the engine cooling system to the atmosphere through a gas outlet of the expansion box at the moment. Whether the expansion box can fill the engine cooling system with the cooling liquid within the preset time or not can be simulated, so that the design size of the expansion box can be determined, and the problem that in the prior art, due to the fact that the expansion box is designed according to experience, improvement can only be conducted after the expansion box is dismantled, and the working efficiency is affected is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of engine cooling systems, and in particular to a simulation method for an engine cooling system. Background Art

[0002] Usually, commercial vehicles mainly use expansion tank circulation to form a degassing circulation system, with the help of the expansion tank to achieve gas-water separation, and the degassed coolant flows back to the main system at the water pump inlet pipe through the return pipe to achieve the purpose of degassing the cooling system. In the prior art, the expansion tank is usually designed based on experience, and the condensate is filled and exhausted after the vehicle is assembled. However, the design of the expansion tank is unreasonable (such as whether it can be filled within the preset time, and the minimum liquid level of the expansion tank is determined based on experience), so it can only be dismantled and then improved, which is time-consuming and labor-intensive. Summary of the invention

[0003] The purpose of the present invention is to provide a simulation method for an engine cooling system to solve the problem in the prior art that the expansion box is designed based on experience, resulting in the need to remove the expansion box for improvement, which affects work efficiency.

[0004] In order to solve the above problems, the present invention provides a simulation method of an engine cooling system, wherein the engine cooling system includes an engine body and an expansion tank which are interconnected, including:

[0005] Build a simulation model of the engine cooling system;

[0006] Fill the expansion tank with condensate at a preset flow rate and for a preset time;

[0007] Observe the filling of coolant in the engine cooling system and determine whether the coolant is filled between the components in the engine cooling system;

[0008] If the coolant is not filled between the components in the engine cooling system, start the engine body to circulate the coolant in the engine cooling system to discharge the gas in the engine cooling system into the atmosphere through the outlet of the expansion tank; if the coolant is filled between the components in the engine cooling system, the engine cooling system operates normally.

[0009] As an optional technical solution for the simulation method of the engine cooling system, the engine cooling system also includes an engine water pump, an engine radiator and a connecting pipe. The outlet of the expansion tank is connected to the inlet of the engine body through the engine water pump, the outlet of the engine body is connected to the inlet of the engine radiator, the outlet of the engine radiator is connected to the inlet of the expansion tank, and the connecting pipe can connect the engine water pump, the engine body, the expansion tank and the engine radiator.

[0010] As an optional technical solution of the simulation method of the engine cooling system, condensate is added to the engine cooling system according to a preset flow rate and a preset time, including:

[0011] Condensate is added to the filling port of the expansion tank at a preset flow rate and preset time, and the engine water pump is used to transport the coolant to the engine body and the engine radiator through the connecting pipe.

[0012] As an optional technical solution for the simulation method of the engine cooling system, observe the filling of coolant in the engine cooling system and judge whether the coolant is filled between the components in the engine cooling system, including:

[0013] When adding coolant to the filling port of the expansion tank, in the simulation model of the engine cooling system, it is possible to directly observe whether there are bubbles in the connecting pipe. If bubbles appear in the connecting pipe, there is gas in the connecting pipe.

[0014] As an optional technical solution of the simulation method of the engine cooling system, if the coolant is not filled between the components of the engine cooling system, the engine cooling system is started to circulate the coolant in the engine cooling system to discharge the gas in the engine cooling system to the atmosphere, including:

[0015] Start the engine body to circulate the coolant in the connecting pipe to discharge the gas in the connecting pipe to the outlet of the expansion tank.

[0016] As an optional technical solution of the simulation method of the engine cooling system, the simulation method of the engine cooling system also includes:

[0017] The engine cooling system also includes an expansion valve disposed in the expansion tank;

[0018] When the vehicle decelerates suddenly, determine whether the pressure value in the expansion tank exceeds the maximum opening pressure value of the expansion valve.

[0019] As an optional technical solution of the simulation method of the engine cooling system, judging whether the pressure value in the expansion tank exceeds the maximum pressure value of the expansion valve includes:

[0020] When the vehicle decelerates suddenly, if the coolant in the expansion tank does not spray out, the pressure value in the expansion tank does not exceed the maximum opening pressure value of the expansion valve; if the coolant in the expansion tank sprays out, the pressure value in the expansion tank exceeds the maximum opening pressure value of the expansion valve.

[0021] As an optional technical solution for the simulation method of the engine cooling system, if the coolant in the expansion tank is sprayed out, the pressure value in the expansion tank exceeds the maximum opening pressure value of the expansion valve, including:

[0022] If the pressure in the expansion tank exceeds the maximum opening pressure of the expansion valve, replace the expansion valve; or reduce the inlet opening of the expansion valve.

[0023] As an optional technical solution of the simulation method of the engine cooling system, the simulation method of the engine cooling system also includes:

[0024] Determine the lowest liquid level line of the expansion tank.

[0025] As an optional technical solution for the simulation method of the engine cooling system, the lowest liquid level line of the expansion tank is determined, including:

[0026] When the liquid level in the expansion tank drops to the preset level, observe whether bubbles are generated at the inlet of the engine body. If bubbles exist at the inlet of the engine body, gas enters the engine body. The preset level is the lowest liquid level line for the expansion tank to work.

[0027] The beneficial effects of the present invention are:

[0028] The present invention provides a simulation method for an engine cooling system, which comprises: firstly constructing a simulation model of the engine cooling system, and then in the simulation model of the engine cooling system, filling condensate into an expansion tank according to a preset flow rate and a preset time, at which time the filling of the coolant in the engine cooling system can be observed, and during the filling process, the coolant will flow into each component of the engine cooling system, and it is judged whether the coolant is filled between each component in the engine cooling system, if the coolant is not filled between each component in the engine cooling system, it is necessary to start the engine body to make the coolant circulate in the engine cooling system, at which time the gas in the engine cooling system is discharged to the atmosphere through the gas outlet of the expansion tank, thereby ensuring the normal operation of the engine cooling system, further improving the service life of the engine cooling system, if the coolant is filled between each component in the engine cooling system, the engine cooling system is operating normally. By using the simulation method for the engine cooling system of the present invention, it is possible to simulate whether the expansion box can fill the engine cooling system with coolant within a preset time, so as to determine the design size of the expansion box, and effectively avoid the problem that the expansion box is designed according to experience in the prior art, which can only be improved after the expansion box is removed, affecting the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A flowchart of a simulation method for an engine cooling system according to an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of the structure of the simulation model of the engine cooling system in the embodiment of the present invention.

[0031] In the figure:

[0032] 1. Engine body;

[0033] 2. Expansion tank;

[0034] 3. Engine water pump;

[0035] 4. Engine radiator;

[0036] 5. Connect the pipeline;

[0037] 6. Warm air radiator. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0039] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. 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 simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] like Figure 1 to Figure 2 As shown, the present embodiment provides a simulation method for an engine cooling system, wherein the engine cooling system comprises an engine body 1 and an expansion tank 2 which are interconnected, and comprises: constructing a simulation model of the engine cooling system; filling the expansion tank 2 with condensate at a preset flow rate and a preset time; observing the filling condition of the coolant in the engine cooling system, and judging whether the coolant is filled between the components in the engine cooling system; if the coolant is not filled between the components in the engine cooling system, starting the engine body 1 to circulate the coolant in the engine cooling system so as to discharge the gas in the engine cooling system into the atmosphere through the air outlet of the expansion tank 2; if the coolant is filled between the components in the engine cooling system, the engine cooling system operates normally.

[0043] According to the simulation method of the engine cooling system of the present invention, a simulation model of the engine cooling system is first constructed, and then in the simulation model of the engine cooling system, condensate is added to the expansion tank 2 according to a preset flow rate and a preset time. At this time, the filling of the coolant in the engine cooling system can be observed. During the filling process, the coolant will flow into the various components of the engine cooling system, and it is judged whether the components in the engine cooling system are filled with coolant. If the components in the engine cooling system are not filled with coolant, it is necessary to start the engine body 1 so that the coolant circulates in the engine cooling system. At this time, the gas in the engine cooling system is discharged to the atmosphere through the outlet of the expansion tank 2, thereby ensuring the normal operation of the engine cooling system and further improving the service life of the engine cooling system. If the components in the engine cooling system are filled with coolant, the engine cooling system is running normally. According to the simulation method of the engine cooling system of the present invention, it is possible to simulate whether the expansion tank 2 can fill the engine cooling system with coolant within a preset time, so as to determine the design size of the expansion tank 2, effectively avoiding the problem that the expansion tank 2 is designed according to experience in the prior art, which can only be improved after the expansion tank 2 is removed, affecting the work efficiency.

[0044] In this embodiment, the engine cooling system also includes an engine water pump 3, an engine radiator 4 and a connecting pipe 5. The outlet of the expansion tank 2 is connected to the inlet of the engine body 1 through the engine water pump 3, the outlet of the engine body 1 is connected to the inlet of the engine radiator 4, the outlet of the engine radiator 4 is connected to the inlet of the expansion tank 2, and the connecting pipe 5 can connect the engine water pump 3, the engine body 1, the expansion tank 2 and the engine radiator 4; when the coolant flows through the engine radiator 4, the heat of the coolant is dissipated and then flows into the expansion tank 2.

[0045] The expansion tank 2 can be filled with coolant, and the engine radiator 4 can dissipate heat.

[0046] Optionally, the engine cooling system also includes a warm air radiator 6, a urea nozzle, a fuel tank heater and a retarder oil cooler. The warm air radiator 6 is connected to the expansion tank 2, the retarder oil cooler is connected to the engine body 1, and the urea nozzle and the fuel tank heater are both connected to the engine water pump 3.

[0047] In some embodiments, condensate is added to the engine cooling system at a preset flow rate and a preset time, including: adding condensate to the filling port of the expansion tank 2 at a preset flow rate and a preset time, and then the engine water pump 3 can be used to transport the coolant to the engine body 1 and the engine radiator 4 through the connecting pipe 5.

[0048] Furthermore, the filling situation of the coolant in the engine cooling system is observed, and it is determined whether the components in the engine cooling system are filled with coolant, including: since the overall pipeline of the connecting pipeline 5 is relatively curved, when the coolant is added to the filling port of the expansion tank 2, in the simulation model of the engine cooling system, it is possible to directly observe whether there are bubbles at the bend in the connecting pipeline 5. If bubbles appear in the connecting pipeline 5, there is gas in the connecting pipeline 5.

[0049] Specifically, if the coolant is not filled between the components in the engine cooling system, the engine cooling system is started to circulate the coolant in the engine cooling system to discharge the gas in the engine cooling system into the atmosphere, including: starting the engine body 1 to circulate the coolant in the connecting pipe 5. At this time, the gas will exist at the top of the connecting pipe 5, and then the gas will reach the expansion tank 2, and finally be discharged into the atmosphere from the outlet of the expansion tank 2.

[0050] It should be noted that the entry of gas into the engine body 1 will affect the normal operation of the engine body 1 and may even cause cracks in the engine cylinder head. Therefore, when the engine body 1 is operating normally, the gas in the connecting pipe 5 needs to be discharged into the atmosphere.

[0051] In this solution, the simulation method of the engine cooling system also includes: the engine cooling system also includes an expansion valve arranged in the expansion tank 2; when the vehicle decelerates suddenly, it is judged whether the pressure value in the expansion tank 2 exceeds the maximum opening pressure value of the expansion valve, so as to judge whether the parameters of the expansion valve are reasonable. When the vehicle stops suddenly, the engine water pump 3 stops, and the inertia causes the coolant to enter the expansion tank 2, and the pressure in the expansion tank 2 increases sharply. If the expansion valve is not designed reasonably, the water in the expansion tank 2 will be sprayed out of the expansion tank 2, affecting the normal operation of the engine cooling system.

[0052] Furthermore, it is determined whether the pressure value in the expansion tank 2 exceeds the maximum pressure value of the expansion valve, including: when the vehicle decelerates suddenly, if the coolant in the expansion tank 2 does not spray out, the pressure value in the expansion tank 2 does not exceed the maximum opening pressure value of the expansion valve; if the coolant in the expansion tank 2 sprays out, the pressure value in the expansion tank 2 exceeds the maximum opening pressure value of the expansion valve.

[0053] Specifically, if the coolant in the expansion tank 2 sprays out, the pressure value in the expansion tank 2 exceeds the maximum opening pressure value of the expansion valve, including: if the pressure value in the expansion tank 2 exceeds the maximum opening pressure value of the expansion valve, the expansion valve is replaced, wherein an expansion valve with a larger maximum opening pressure value needs to be replaced.

[0054] Alternatively, the inlet opening of the expansion valve is reduced. Wherein, the inlet opening of the expansion valve is appropriately reduced without affecting the degassing.

[0055] In this embodiment, the simulation method of the engine cooling system further includes: determining the lowest liquid level line of the expansion tank 2 to ensure that the gas does not enter the engine body 1, thereby ensuring the normal operation of the engine body 1.

[0056] Further, judging the lowest working liquid level of the expansion tank 2 includes: when the liquid level in the expansion tank 2 drops to a preset liquid level, observing whether bubbles are generated at the inlet of the engine body 1, if bubbles exist at the inlet of the engine body 1, gas enters the engine body 1, and the preset liquid level is the lowest working liquid level of the expansion tank 2. Therefore, in design, the lowest working liquid level of the expansion tank 2 should be greater than the preset liquid level.

[0057] Specifically, constructing the simulation model of the engine cooling system includes: modeling the engine cooling system; meshing the engine cooling system; and setting calculation parameters of the engine cooling system.

[0058] The simulation method of the engine cooling system of the present invention can build an engine cooling system simulation model, verify the calibration working condition simulation model, calculate the cooling water circuit gravity filling simulation working condition, calculate the cooling water circuit degassing simulation working condition, establish an optimization scheme model and calculate each working condition, compile a degassing performance analysis, and can simulate the design size of the expansion box and the minimum liquid level line of the expansion box, effectively avoiding the problem of designing the expansion box based on experience in the prior art, which results in the need to remove the expansion box for improvement, affecting work efficiency.

[0059] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A simulation method for an engine cooling system, wherein the engine cooling system comprises an engine body (1) and an expansion tank (2) which are interconnected, wherein: include: Build a simulation model of the engine cooling system; Filling the expansion tank (2) with condensate at a preset flow rate and for a preset time; Observe the filling condition of the coolant in the engine cooling system, and determine whether the coolant is fully filled between the components in the engine cooling system; If the coolant is not filled between the components of the engine cooling system, the engine body (1) is started to circulate the coolant in the engine cooling system so as to discharge the gas in the engine cooling system into the atmosphere through the outlet of the expansion tank (2); if the coolant is filled between the components of the engine cooling system, the engine cooling system operates normally.

2. The method for simulating an engine cooling system according to claim 1, characterized in that: The engine cooling system further comprises an engine water pump (3), an engine radiator (4) and a connecting pipe (5); the outlet of the expansion tank (2) is connected to the inlet of the engine body (1) through the engine water pump (3); the outlet of the engine body (1) is connected to the inlet of the engine radiator (4); the outlet of the engine radiator (4) is connected to the inlet of the expansion tank (2); and the connecting pipe (5) is capable of connecting the engine water pump (3), the engine body (1), the expansion tank (2) and the engine radiator (4).

3. The simulation method of the engine cooling system according to claim 2, characterized in that: Filling the engine cooling system with condensate at a predetermined flow rate and for a predetermined time includes: Condensate is added to the filling port of the expansion tank (2) at a preset flow rate and a preset time, and the engine water pump (3) is used to transport the coolant to the engine body (1) and the engine radiator (4) through the connecting pipe (5).

4. The simulation method of the engine cooling system according to claim 3, characterized in that: Observing the filling condition of the coolant in the engine cooling system and determining whether the coolant is fully filled between the components in the engine cooling system, including: When the coolant is added to the filling port of the expansion tank (2), in the simulation model of the engine cooling system, it is possible to directly observe whether bubbles exist in the connecting pipe (5); if bubbles appear in the connecting pipe (5), gas exists in the connecting pipe (5).

5. The simulation method of the engine cooling system according to claim 2, characterized in that: If coolant is not filled between components in the engine cooling system, the engine cooling system is started to circulate coolant in the engine cooling system to discharge gas in the engine cooling system into the atmosphere, including: The engine body (1) is started to circulate the coolant in the connecting pipe (5) so as to discharge the gas in the connecting pipe (5) to the gas outlet of the expansion tank (2).

6. The simulation method of the engine cooling system according to claim 2, characterized in that: The simulation method of the engine cooling system also includes: The engine cooling system further comprises an expansion valve arranged in the expansion tank (2); When the vehicle decelerates suddenly, it is determined whether the pressure value in the expansion tank (2) exceeds the maximum opening pressure value of the expansion valve.

7. The method for simulating an engine cooling system according to claim 6, characterized in that: Determining whether the pressure value in the expansion tank (2) exceeds the maximum pressure value of the expansion valve comprises: When the vehicle decelerates suddenly, if the coolant in the expansion tank (2) does not spray out, the pressure value in the expansion tank (2) does not exceed the maximum opening pressure value of the expansion valve; if the coolant in the expansion tank (2) sprays out, the pressure value in the expansion tank (2) exceeds the maximum opening pressure value of the expansion valve.

8. The method for simulating an engine cooling system according to claim 7, characterized in that: If the coolant in the expansion tank (2) sprays out, the pressure value in the expansion tank (2) exceeds the maximum opening pressure value of the expansion valve, including: If the pressure value in the expansion tank (2) exceeds the maximum opening pressure value of the expansion valve, the expansion valve is replaced; or the inlet opening of the expansion valve is reduced.

9. The method for simulating an engine cooling system according to claim 2, characterized in that: The simulation method of the engine cooling system also includes: Determine the lowest liquid level line of the expansion tank (2) during operation.

10. The simulation method of the engine cooling system according to claim 9, characterized in that: Determining the lowest liquid level line of the expansion tank (2) during operation includes: When the liquid level in the expansion tank (2) drops to a preset liquid level, observe whether bubbles are generated at the inlet of the engine body (1). If bubbles exist at the inlet of the engine body (1), gas enters the engine body (1). The preset liquid level is the lowest liquid level line of the expansion tank (2) at work.

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