Control method of vehicle water circulation system and vehicle water circulation system

Abstract

The invention relates to the technical field of heat control of vehicles, in particular to a control method of a vehicle water circulation system and the vehicle water circulation system. The vehicle water circulation system comprises a supply loop and water use loops, the water use loops are connected to the supply loop in parallel, and each water use loop is provided with a stop valve used for controlling on-off. The control method comprises the steps that when the water using loop is communicated with the supply loop, the fluctuation amplitude of water pressure in the supply loop is obtained, whether the fluctuation amplitude is larger than a preset value or not is judged, and if yes, the interval duration of opening and closing actions of the stop valve is controlled to be increased. According to the vehicle water circulation system, the pipelines of the vehicle water circulation system are arranged in the mode that the water use loops and the supply loops are connected in parallel, the pipelines arranged on the chassis can be greatly simplified, the space of the chassis is saved, the installation and maintenance difficulty of the pipelines is lowered, and the action interval duration of the stop valve is controlled through the fluctuation amplitude; and mutual interference of a plurality of water use loops in the water use process can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of heat control of vehicles, and in particular to a control method of a vehicle water circulation system and a vehicle water circulation system. Background Art

[0002] In the prior art, in order to enable vehicles to be used in extremely cold weather, water circuits are usually provided to provide heat to components such as fuel tanks and urea tanks. These water circuits are each connected to the engine separately. Thus, when each functional component needs to be cooled or heated, water can be taken from the engine for heat exchange separately, so as to avoid the situation where the fuel in the fuel tank is waxed and the fluidity is reduced, or even the oil circuit is blocked, and to avoid the situation where the urea in the urea tank is crystallized and the post-treatment exhaust gas is not fully decomposed.

[0003] However, due to the large number of functional components on the vehicle that need to exchange heat, this split water circuit will cause the pipelines fixed on the vehicle chassis to be too complicated, which not only occupies a large amount of limited space on the chassis, but also increases the difficulty of pipeline layout and maintenance. During the operation of the vehicle, there is often a problem that water intake is too concentrated, resulting in interference between multiple water circuits and insufficient water supply for each water circuit. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a control method for a vehicle water circulation system and a vehicle water circulation system, so as to simplify the structure of the pipeline, reduce the difficulty of installation and maintenance of the pipeline, save the space of the chassis, and avoid mutual interference between multiple water circuits of the vehicle water circulation system.

[0005] In a first aspect, the present invention provides a control method for a vehicle water circulation system, the vehicle water circulation system comprising: a supply circuit and a water use circuit, a plurality of the water use circuits are connected in parallel to the supply circuit, and the water use circuit is provided with a stop valve for controlling on and off; The control method is: when the water use circuit is connected to the supply circuit, the fluctuation amplitude of the water pressure in the supply circuit is obtained, and it is determined whether the fluctuation amplitude is greater than a preset value. If so, the interval time of the stop valve switching action is increased.

[0006] According to a control method for a vehicle water circulation system provided by the present invention, the interval duration of the switching action of the stop valve includes: the interval duration of two consecutive switching actions in the switching action performed by any stop valve of the water circuit.

[0007] According to a control method for a vehicle water circulation system provided by the present invention, the supply circuit is controlled to transfer heat to the water use circuit at a set heat transfer rate.

[0008] According to a control method for a vehicle water circulation system provided by the present invention, the control of transferring heat at a set heat transfer rate includes: obtaining the temperature difference between the water in the supply circuit and the component to be heat exchanged, and controlling the flow rate of water in the water use circuit to be inversely proportional to the temperature difference.

[0009] According to a control method for a vehicle water circulation system provided by the present invention, the control of transferring heat at a set heat transfer rate includes: obtaining a change value of water in the water use circuit before and after heat exchange with a component to be heat exchanged, and controlling the flow rate of water in the water use circuit to be inversely proportional to the change value.

[0010] According to a control method for a vehicle water circulation system provided by the present invention, the supply circuit is connected in series with the engine water pump, and the engine water pump power is dynamically adjusted according to the fluctuation amplitude, so that the engine water pump power is controlled to be proportional to the fluctuation amplitude.

[0011] According to a control method for a vehicle water circulation system provided by the present invention, the opening of the shut-off valve is controlled to be positively correlated with the power of the engine water pump.

[0012] According to a control method for a vehicle water circulation system provided by the present invention, the water use circuit is set to be connected to the supply circuit when the external environment is in a specific temperature range, the real-time temperature of the external environment is obtained, and it is determined whether the real-time temperature is in the specific temperature range. If so, the water use circuit is controlled to be connected to the supply circuit.

[0013] In a second aspect, the present invention further provides a vehicle water circulation system, including a supply circuit and a plurality of water-using circuits connected in parallel to the supply circuit, and adopts the control method of the vehicle water circulation system described above.

[0014] According to a vehicle water circulation system provided by the present invention, the supply circuit is connected in series with the engine's radiator water tank and is provided with an engine water pump, and the water use circuit is provided in series with a shut-off valve for controlling the on-off of the water use circuit and the supply circuit.

[0015] The above one or more technical solutions in the present invention have at least one of the following technical effects: the pipelines in the vehicle water circulation system are arranged in the form of multiple water use circuits and supply circuits in parallel, the supply circuits are arranged around the vehicle chassis and the functional components are connected to the supply circuits nearby through the water use circuits, which can greatly simplify the pipelines arranged on the chassis, saving space on the chassis and reducing the difficulty of installation and maintenance of the pipelines, and can control the on and off of each water use circuit in real time by monitoring the fluctuation amplitude of the water pressure in the supply circuit, avoiding the problem of mutual interference between multiple water use circuits during water use.

[0016] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a vehicle water circulation system provided in an embodiment of the present invention.

[0019] Figure 2 A schematic diagram of a control method for a vehicle water circulation system provided in an embodiment of the present invention.

[0020] Reference numerals: 100, engine; 200, supply circuit; 300, water circuit; 310, stop valve; 320, functional component. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all 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.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0026] like Figure 1 As shown, the vehicle water circulation system of the present invention mainly includes a supply circuit 200 and a water circuit 300. The supply circuit 200 is connected in series with the engine 100, and the water after heat exchange with the engine 100 can directly enter the supply circuit 200 for circulation. Alternatively, the water after heat exchange with the engine 100 first enters the heat dissipation device for preliminary cooling, and then enters the supply circuit 200.

[0027] In addition, several water circuits 300 are connected in parallel to the supply circuit 200 to guide the water in the supply circuit 200 to each functional component 320 to exchange heat. Specifically, a shut-off valve 310 and a functional component 320 are arranged in series in each water circuit 300. By controlling the shut-off valve 310 to open or close, the water circuit 300 can be connected or disconnected from the supply circuit 200. Moreover, changing the opening of the shut-off valve 310 can adjust the flow rate of water in each water circuit 300. Among them, the functional component 320 includes: a fuel tank, a urea tank, a urea nozzle, and a vehicle air conditioner, etc.

[0028] The vehicle water circulation system also includes a control unit. The control unit is electrically connected to the stop valve 310 in each water circuit 300 and is used to adjust the opening of the stop valve 310. In addition, a water pressure sensor for detecting the amplitude of water pressure fluctuation is provided in the supply circuit 200. Water temperature sensors for detecting water temperature are respectively provided in the supply circuit 200 and the water circuit 300. The control unit is electrically connected to the water pressure sensor and the water temperature sensor respectively.

[0029] In the northern part of my country, the temperature in winter is often below zero degrees Celsius. In some areas, the temperature can even drop to minus 40 to minus 50 degrees Celsius. In order to enable the vehicle to be used in severe cold weather, the water that has absorbed 100% of the heat from the engine is usually directed to the fuel tank, urea tank and other parts for heating to avoid the fuel in the fuel tank from waxing and reducing its fluidity or even blocking the oil line, and to avoid the urea in the urea tank from crystallizing and causing insufficient decomposition of the post-treatment exhaust gas.

[0030] In addition, in order to solve the problem of multiple water use circuits 300 interfering with each other and insufficient water supply in each water use circuit 300 due to over-concentrated water intake during vehicle operation, an embodiment of the present invention introduces a control method for a vehicle water circulation system.

[0031] like Figure 2 As shown, specifically, when the water use circuit 300 is connected to the supply circuit 200, the fluctuation amplitude of the water pressure in the supply circuit 200 is obtained, and it is determined whether the fluctuation amplitude is greater than a preset value. If so, the interval duration of the switching action of the stop valve 310 is controlled to increase.

[0032] When the fluctuation amplitude is greater than the preset value, it means that too much water in the supply circuit 200 flows into the water circuit 300 in a short period of time, and the amount of water added by the engine 100 to the supply circuit 200 cannot meet the amount of water delivered by the supply circuit 200 to the water circuit 300, resulting in a sharp fluctuation of the water pressure in the supply circuit 200, which greatly affects the water supply stability of the vehicle water circulation system. Therefore, the stability of the vehicle water circulation system is ensured by increasing the interval time of the switch action of the stop valve 310.

[0033] For example, through theoretical calculations and test results, it is found that controlling the fluctuation amplitude of the water pressure in the supply circuit 200 within 0.5 Bar can ensure that the vehicle water circulation system stably supplies water to each functional component 320 .

[0034] In addition, the fluctuation amplitude of the water pressure in the supply circuit 200 is controlled within the range of 0.5 Bar, and the water pump compensation mode of the engine 100 can also be adopted. When the stop valve 310 of the water supply circuit 300 is opened, it is detected that the water pressure fluctuation amplitude in the supply circuit 200 is large, indicating that the water supply circuit 300 needs a large flow of water, so the output power of the water pump of the engine 100 is controlled to increase to speed up the speed of water entering the supply circuit 200.

[0035] Correspondingly, when the stop valve 310 of the water circuit 300 is closed, the water pressure fluctuation amplitude in the supply circuit 200 is monitored to be large, indicating that the flow rate of water entering the supply circuit 200 is much greater than the actually required flow rate, thereby controlling the output power of the engine 100 water pump to decrease in order to slow down the speed at which water enters the supply circuit 200.

[0036] In this embodiment, the pipelines in the vehicle water circulation system are arranged in the form of multiple water circuits 300 connected in parallel with the supply circuit 200. The supply circuit 200 is arranged around the vehicle chassis and the functional components 320 are connected to the supply circuit 200 nearby through the water circuit 300. This can greatly simplify the pipelines arranged on the chassis, saving space on the chassis and reducing the difficulty of installation and maintenance of the pipelines. In addition, by monitoring the fluctuation amplitude of the water pressure in the supply circuit 200, the on and off of each water circuit 300 can be controlled in real time, avoiding the problem of mutual interference between multiple water circuits 300 during water use.

[0037] Based on the above embodiment, in another embodiment of the present invention, a control method for a vehicle water circulation system is introduced.

[0038] The interval duration of the switching action of the stop valve 310 includes: the interval duration of two consecutive switching actions in any switching action performed by the stop valve 310 of the water circuit 300 .

[0039] The specific scheme for controlling the increase of the interval time of the on-off action of the stop valve 310 includes: increasing the interval time of opening and closing the stop valve 310 in the same water supply circuit 300. The specific scheme for controlling the increase of the interval time of the on-off action of the stop valve 310 also includes: increasing the interval time of opening and closing the stop valve 310 in different water supply circuits 300.

[0040] In this embodiment, by controlling the interval duration of the switching action of the stop valves 310 in all water circuits 300, it is possible to avoid the water supply circuit from supplying water to multiple water circuits 300 in a short period of time, avoid mutual interference between multiple water circuits 300, and ensure the stable operation of the vehicle water circulation system.

[0041] Based on the above embodiment, another embodiment of the present invention introduces a control method for a vehicle water circulation system. The method mainly adjusts the heat exchange between the supply circuit 200 and the water circuit 300.

[0042] Specifically, the supply circuit 200 is controlled to transfer heat to the water use circuit 300 at a set heat transfer rate. The heat transfer from the supply circuit 200 to the water use circuit 300 is carried out through water. Therefore, the opening of the stop valve 310 in the water use circuit 300 can be controlled to adjust the water supply flow rate, thereby controlling the supply circuit 200 to transfer heat to the water use circuit 300 at a set heat transfer rate.

[0043] Based on the above embodiment, another embodiment of the present invention introduces a control method for a vehicle water circulation system. Among them, the factor affecting the heat transfer rate between two objects is mainly the temperature difference between the two objects. The greater the temperature difference, the more heat is transferred per unit time. The smaller the temperature difference, the less heat is transferred per unit time.

[0044] Therefore, the control of transferring heat at a set heat transfer rate includes: obtaining the temperature difference between the water in the supply loop 200 and the component to be heat exchanged, and controlling the flow rate of water in the water use loop 300 to be inversely proportional to the temperature difference.

[0045] Specifically, when the temperature difference between the water in the supply loop 200 and the component to be heat exchanged is large, the heat exchange per unit time is large, so it is necessary to reduce the heat exchange by reducing the water flow rate. When the temperature difference between the water in the supply loop 200 and the component to be heat exchanged is small, the heat exchange per unit time is small, so it is necessary to increase the heat exchange by increasing the water flow rate. This ensures that a stable heat transfer rate is maintained between the supply loop 200 and the water use loop 300.

[0046] Based on the above embodiment, in another embodiment of the present invention, a control method for a vehicle water circulation system is introduced.

[0047] In order to more accurately control the supply circuit 200 and the water circuit 300 to maintain a stable heat transfer rate, it is also possible to obtain the change value of the water in the water circuit 300 before and after the heat exchange with the component to be heat exchanged, and control the flow rate of water in the water circuit 300 to be inversely proportional to the change value to ensure that the supply circuit 200 transfers heat to the water circuit 300 at the set heat transfer rate.

[0048] Based on the above embodiment, another embodiment of the present invention introduces a control method for a vehicle water circulation system, wherein the supply circuit 200 is connected in series with the water pump of the engine 100, and the power of the water pump of the engine 100 can be dynamically adjusted according to the fluctuation amplitude of the supply circuit 200, and the power of the water pump of the engine 100 is controlled to be proportional to the fluctuation amplitude.

[0049] Specifically, when the water circuit 300 is connected to the supply circuit 200, the fluctuation amplitude of the water pressure in the supply circuit 200 is obtained, and the water pump power of the engine 100 is controlled to be proportional to the fluctuation amplitude.

[0050] When the fluctuation amplitude is greater than the preset value, it means that too much water in the supply circuit 200 flows into the water circuit 300 in a short period of time, and the amount of water added to the supply circuit 200 by the engine 100 cannot meet the amount of water delivered by the supply circuit 200 to the water circuit 300, resulting in a violent fluctuation of the water pressure in the supply circuit 200, which greatly affects the water supply stability of the vehicle water circulation system. Therefore, a compensation mode is adopted to control the power of the engine 100 water pump in direct proportion to the fluctuation amplitude of the water pressure in the supply circuit 200 to ensure that the supply circuit 200 supplies water to the water circuit 300 stably.

[0051] When the stop valve 310 of the water circuit 300 is opened, it is detected that the water pressure fluctuation in the supply circuit 200 is large, indicating that the water circuit 300 needs a large flow of water, so the output power of the water pump of the engine 100 is controlled to increase to speed up the speed of water entering the supply circuit 200.

[0052] Correspondingly, when the stop valve 310 of the water circuit 300 is closed, the water pressure fluctuation amplitude in the supply circuit 200 is monitored to be large, indicating that the flow rate of water entering the supply circuit 200 is much greater than the actually required flow rate, thereby controlling the output power of the engine 100 water pump to decrease in order to slow down the speed at which water enters the supply circuit 200.

[0053] Furthermore, in order to more accurately control the heat transfer rate between the supply circuit 200 and the water use circuit 300 , the flow rate of water supplied from the supply circuit 200 to the water use circuit 300 may be ensured by adjusting the opening of the stop valve 310 .

[0054] The specific method is: controlling the opening of the stop valve 310 to be positively correlated with the power of the water pump of the engine 100. In this way, it is possible to ensure that the supply circuit 200 smoothly delivers a large flow of water to the water circuit 300.

[0055] In order to ensure that the vehicle can be used in extremely cold weather and adapt to temperatures of minus 40 to minus 50 degrees Celsius in some areas, based on the above embodiment, another embodiment of the present invention introduces a control method for a vehicle water circulation system that can be applied to multiple temperature ranges.

[0056] Among them, the water use circuit 300 is set to be connected with the supply circuit 200 when the external environment is in a specific temperature range, the real-time temperature of the external environment is obtained, and it is determined whether the real-time temperature is in the specific temperature range. If so, the water use circuit 300 is controlled to be connected with the supply circuit 200.

[0057] For example, the water circuit 300 set for heating the vehicle fuel tank can be applied to different low-temperature working conditions. That is, the fuel tank heating of the system is divided into five gears, the first gear is applicable to No. 0 diesel, the fuel heating function is turned on at 4°C, and the fuel heating function heats the fuel to 4°C to 10°C; the second gear is applicable to No. -10 diesel, the fuel heating function is turned on at -5°C, and the fuel heating function heats the fuel to -5°C to 5°C; the third gear is applicable to No. -20 diesel, the fuel heating function is turned on at -14°C, and the fuel heating function heats the fuel to -5°C to -15°C; the fourth gear is applicable to No. -35 diesel, the fuel heating function is turned on at -29°C, and the fuel heating function heats the fuel to -14°C to -29°C; the fifth gear is applicable to No. -50 diesel, the fuel heating function is turned on at -44°C, and the fuel heating function heats the fuel to -29°C to -44°C.

[0058] In addition, vehicles using diesel are usually equipped with a post-treatment bag and a urea tank. When the vehicle is running, urea needs to be sprayed in the post-treatment bag to promote the decomposition of nitrogen oxides produced by burning diesel. At the same time, it is also necessary to maintain a high temperature in the post-treatment bag to promote the decomposition of exhaust gas. However, high temperature will cause urea to decompose prematurely, so the urea nozzle needs to be cooled to below the critical point of urea decomposition temperature to prevent urea from decomposing at high temperature before injection. Cooling the post-treatment through the vehicle water circulation system is a common cooling method.

[0059] On the other hand, too low ambient temperature will cause urea crystallization in the urea tank. Once urea crystallizes, the exhaust gas in the post-treatment bag will not be fully decomposed, and in severe cases, the post-treatment bag will be blocked. To prevent urea crystallization, the urea tank needs to be heated when the ambient temperature is lower than the urea crystallization temperature. Heating the urea tank through the vehicle water circulation system is a common heating method.

[0060] Urea in the urea tank generally starts to crystallize at about 1°C under normal pressure, and urea crystallization will affect the normal operation of the vehicle. The control method of the present invention can start the urea heating function when the urea temperature is lower than 5°C, and end the urea heating function when the urea temperature reaches 30°C.

[0061] Overheating of the urea nozzle in the post-treatment bag will reduce the life of the urea nozzle. The control method of the present invention is based on theoretical calculations and test results. When the urea nozzle is higher than 120°C, the water circuit 300 for cooling the urea nozzle is connected to the supply circuit 200. When the temperature of the urea nozzle drops to 80°C, the stop valve 310 of the water circuit 300 for cooling the urea nozzle is closed to stop cooling the urea nozzle.

[0062] Therefore, the above control method can ensure the normal operation of the vehicle in extreme weather conditions, greatly broadening the temperature range in which the vehicle can be used.

[0063] Based on the above embodiment, another embodiment of the present invention introduces a vehicle water circulation system, wherein the vehicle water circulation system mainly includes a supply circuit 200 and a water circuit 300. The vehicle water circulation system adopts any one of the control methods in the above embodiments.

[0064] The supply circuit 200 is connected in series with the engine 100, and the water after heat exchange with the engine 100 can directly enter the supply circuit 200 for circulation. Alternatively, the water after heat exchange with the engine 100 first enters the heat sink for preliminary cooling, and then enters the supply circuit 200.

[0065] In addition, several water circuits 300 are connected in parallel to the supply circuit 200 to guide the water in the supply circuit 200 to each functional component 320 to exchange heat. Specifically, a shut-off valve 310 and a functional component 320 are arranged in series in each water circuit 300. By controlling the shut-off valve 310 to open or close, the water circuit 300 can be connected or disconnected from the supply circuit 200. Moreover, changing the opening of the shut-off valve 310 can adjust the flow rate of water in each water circuit 300. Among them, the functional component 320 includes: a fuel tank, a urea tank, a urea nozzle, and a vehicle air conditioner, etc.

[0066] The vehicle water circulation system also includes a control unit. The control unit is electrically connected to the stop valve 310 in each water circuit 300 and is used to adjust the opening of the stop valve 310. In addition, a water pressure sensor for detecting the amplitude of water pressure fluctuation is provided in the supply circuit 200. Water temperature sensors for detecting water temperature are respectively provided in the supply circuit 200 and the water circuit 300. The control unit is electrically connected to the water pressure sensor and the water temperature sensor respectively.

[0067] Furthermore, the supply circuit 200 is connected in series with the cooling water tank of the engine 100 and is provided with a water pump of the engine 100 , and the water circuit 300 is provided in series with a stop valve 310 for controlling the connection and disconnection of the water circuit 300 and the supply circuit 200 .

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling a vehicle water circulation system, characterized in that: The vehicle water circulation system comprises: a supply circuit and a water circuit, a plurality of water circuits are connected in parallel to the supply circuit, and the water circuit is provided with a stop valve for controlling on and off; The control method is: when the water use circuit is connected to the supply circuit, the fluctuation amplitude of the water pressure in the supply circuit is obtained, and it is determined whether the fluctuation amplitude is greater than a preset value. If so, the interval time of the stop valve switching action is increased.

2. The control method of the vehicle water circulation system according to claim 1, characterized in that: The interval duration of the switching action of the stop valve includes: the interval duration of two consecutive switching actions in the switching action performed by any stop valve of the water circuit.

3. The control method of the vehicle water circulation system according to claim 2, characterized in that: The supply circuit is controlled to transfer heat to the water circuit at a set heat transfer rate.

4. The control method of the vehicle water circulation system according to claim 3, characterized in that: The controlling of transferring heat at a set heat transfer rate includes: obtaining a temperature difference between the water in the supply circuit and the component to be heat exchanged, and controlling the flow rate of water in the water use circuit to be inversely proportional to the temperature difference.

5. The control method of the vehicle water circulation system according to claim 3, characterized in that: The control of transferring heat at a set heat transfer rate includes: obtaining a change value of water in the water use circuit before and after heat exchange with the heat exchange component, and controlling the flow rate of water in the water use circuit to be inversely proportional to the change value.

6. The control method of the vehicle water circulation system according to claim 1 or 2, characterized in that: The supply circuit is connected in series with the engine water pump, and the engine water pump power is dynamically adjusted according to the fluctuation amplitude, so that the engine water pump power is controlled to be proportional to the fluctuation amplitude.

7. The control method of the vehicle water circulation system according to claim 6, characterized in that: Controlling the opening of the shut-off valve is positively correlated with the power of the engine water pump.

8. The control method of the vehicle water circulation system according to any one of claims 1 to 3, characterized in that: The water use circuit is set to be connected to the supply circuit when the external environment is in a specific temperature range, the real-time temperature of the external environment is obtained, and it is determined whether the real-time temperature is in the specific temperature range. If so, the water use circuit is controlled to be connected to the supply circuit.

9. A vehicle water circulation system, characterized in that: It comprises a supply circuit and a plurality of water circuits connected in parallel to the supply circuit, and adopts the control method of the vehicle water circulation system as described in any one of claims 1-8.

10. The vehicle water circulation system according to claim 9, characterized in that: The supply circuit is connected in series with the engine's radiator water tank and is provided with an engine water pump, and the water circuit is provided in series with a shutoff valve for controlling the on-off of the water circuit and the supply circuit.

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