WO2024078498A1

WO2024078498A1 - Engine cooling system and control method therefor, and vehicle

Info

Publication number: WO2024078498A1
Application number: PCT/CN2023/123801
Authority: WO
Inventors: 刘强; 董春艳; 杨栋宇; 孙凡嘉
Original assignee: 广州汽车集团股份有限公司
Priority date: 2022-10-10
Filing date: 2023-10-10
Publication date: 2024-04-18

Abstract

Provided are an engine cooling system and a control method therefor, and a vehicle. The engine cooling system comprises: a cylinder (10), a first water inlet pipe (21), a first water outlet pipe (31) and a second water outlet pipe (32); the cylinder (10) comprises a cylinder body (110); an inlet of the first water inlet pipe (21) is used for receiving cooling liquid for cooling the cylinder body (110); an outlet of the first water inlet pipe (21) is connected to the cylinder body (110); the first water outlet pipe (31) is provided at the upper section of the cylinder body (110); the second water outlet pipe (32) is provided at the lower section of the cylinder body (110); and the first water inlet pipe (21) is communicated with both the first water outlet pipe (31) and the second water outlet pipe (32), and the communication position thereof is located in the cylinder body (110). The cooling system may reduce uneven thermal deformation of the upper and lower sections of the cylinder body (110) and reduce air leakage, thereby ensuring stable engine output power.

Description

Engine cooling system and control method thereof and vehicle

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to the Chinese patent application filed with the Chinese Patent Office on October 10, 2022, with application number 202222666765.1 and patent application name “Engine Cooling System and Vehicle”, and the Chinese patent application filed with the Chinese Patent Office on October 10, 2022, with application number 202211237345.X and patent application name “Engine Cooling System, Control Method and Vehicle”, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the field of engine technology, and in particular to an engine cooling system and a control method thereof and a vehicle.

Background technique

The cylinder of the vehicle engine needs to be cooled during operation to avoid excessive cylinder temperature. However, during the rotation of the cylinder, the temperature of the upper and lower layers of the cylinder body is different, so the upper and lower layers of the engine cylinder body are heated differently, resulting in uneven thermal deformation, which is prone to poor cylinder sealing. Poor sealing will cause air leakage, resulting in unstable engine output power.

Summary of the invention

One object of the present application is to provide an engine cooling system and a control method thereof and a vehicle, which can reduce the uneven thermal deformation of the upper and lower parts of the cylinder body and reduce air leakage, thereby ensuring the stable output power of the engine.

According to one aspect of the present application, the present application provides an engine cooling system, the engine cooling system comprising:

A cylinder, wherein the cylinder comprises a cylinder body;

a first water inlet pipe, wherein the inlet of the first water inlet pipe is used to receive the coolant for cooling the cylinder block, and the outlet of the first water inlet pipe is connected to the cylinder block; and

A first water outlet pipe and a second water outlet pipe, wherein the first water outlet pipe is arranged at the upper half of the cylinder body, and the second water outlet pipe is arranged at the lower half of the cylinder body, and the first water inlet pipe is connected with both the first water outlet pipe and the second water outlet pipe, and the connection position is located at the cylinder body.

In one aspect, the engine cooling system further includes: a first flow regulator and a second flow regulator, the first flow regulator being disposed in the first water outlet pipe, and the second flow regulator being disposed in the second water outlet pipe.

In one aspect, the engine cooling system further includes: a water tank and a stepless water pump, the water tank is connected to the stepless water pump, and the stepless water pump is connected to the first water inlet pipe.

In one aspect, the engine cooling system further includes: a radiator, one end of the radiator is connected to the first flow regulator and the second flow regulator respectively, and the other end of the radiator is connected to the stepless water pump.

In one aspect, the engine cooling system includes a thermostat valve disposed in a pipeline between the first flow regulator and the radiator.

In one aspect, the engine cooling system includes a water return pipe, one end of which is connected to the first flow regulator, and the other end of which is connected to the stepless water pump.

In one aspect, the engine cooling system further comprises:

The first water outlet valve is arranged in the first water outlet pipe and is located between the first flow regulator and the between the cylinder blocks; and

A second water outlet valve is provided in the second water outlet pipe and is located between the second flow regulator and the cylinder body.

In one aspect, the cylinder further comprises a cylinder head, wherein the cylinder head is disposed on the upper half of the cylinder body;

The engine cooling system further comprises:

a second water inlet pipe, wherein the inlet of the second water inlet pipe is connected to the stepless water pump, and the outlet of the second water inlet pipe is connected to the cylinder head;

A cover body water outlet pipe, one end of which is connected to the cylinder head and communicates with the second water inlet pipe in the cylinder head, and the other end of which is connected to the first flow regulator.

In one aspect, the engine cooling system comprises:

Heating device;

A warm air heating pipe, one end of which is connected to the cover water outlet pipe, and the other end of which is connected to the warm air device;

A heating return pipe, one end of which is connected to the heating device, and the other end of which is connected to the first flow regulator.

In one aspect, the engine cooling system includes a heating valve, which is arranged in the warm air heating pipe.

In one aspect, the engine cooling system comprises:

An oil cooler, the oil cooler being used to reduce the temperature of the oil;

A cooler water supply pipe, one end of which is connected to the stepless water pump, and the other end of which is connected to the oil cooler;

An oil return pipe, one end of which is connected to the oil cooler, and the other end of which is connected to the first flow regulator.

In addition, in order to solve the above problems, the present application also provides a control method of an engine cooling system, the control method is used to control the engine cooling system as described above, the control method comprises:

Acquiring temperature parameters of the engine;

determining an operating stage of the engine according to the temperature parameter;

According to the operation stage of the engine, the flow rates of the coolant in the first water outlet pipe and the second water outlet pipe are controlled respectively.

The engine cooling system comprises: a first flow regulator, a second flow regulator, a water tank, a stepless water pump, a second water inlet pipe, a cover water outlet pipe and a heating valve, wherein the first flow regulator is arranged in the first water outlet pipe, the second flow regulator is arranged in the second water outlet pipe, the water tank is connected to the stepless water pump, the stepless water pump is connected to the first water inlet pipe, the inlet of the second water inlet pipe is connected to the stepless water pump, the outlet of the second water inlet pipe is connected to the cylinder head, one end of the cover water outlet pipe is connected to the cylinder head and communicated with the second water inlet pipe in the cylinder head, and the other end of the cover water outlet pipe is connected to the first flow regulator;

The engine cooling system further comprises: a warm air device, a warm air supply pipe and a heating return pipe, one end of the warm air supply pipe is connected to the cover body water outlet pipe, and the other end is connected to the warm air device, one end of the heating return pipe is connected to the warm air device, and the other end is connected to the first flow regulator, and the heating valve is arranged in the warm air supply pipe;

After the step of determining the operating stage of the engine according to the temperature parameter, the method further comprises:

When the temperature of the engine is lower than a first temperature threshold, it is determined that the engine is running in the warm-up phase, and the Heating valve;

When the temperature of the engine is higher than the first temperature threshold and lower than a second temperature threshold, the heating valve is opened in response to heating, wherein the first temperature threshold is lower than the second temperature threshold.

In one aspect, the engine cooling system further comprises: a radiator, a return pipe and a thermostatic valve, one end of the radiator is connected to the first flow regulator and the second flow regulator respectively, the other end of the radiator is connected to the stepless water pump, one end of the return pipe is connected to the first flow regulator, the other end of the return pipe is connected to the stepless water pump, and the thermostatic valve is arranged in the pipeline between the first flow regulator and the radiator;

When the temperature of the engine reaches the second temperature threshold, the thermostat valve is controlled to open.

In one aspect, the engine cooling system further comprises: a first water outlet valve and a second water outlet valve, the first water outlet valve being disposed in the first water outlet pipe and located between the first flow regulator and the cylinder body, the second water outlet valve being disposed in the second water outlet pipe and located between the second flow regulator and the cylinder body;

The step of controlling the flow rate of the coolant in the first water outlet pipe and the second water outlet pipe respectively according to the operation stage of the engine comprises:

When the water temperature of the upper half of the cylinder body is higher than a third temperature threshold, controlling the first water outlet valve to open;

When the water temperature in the lower half of the cylinder body is higher than a third temperature threshold, the second water outlet valve is controlled to open, wherein the second temperature threshold is lower than the third temperature threshold.

In addition, in order to solve the above-mentioned problem, the present application also provides a vehicle, which includes a frame and an engine cooling system as described above, wherein the frame forms a supporting space, and the engine cooling system is arranged in the supporting space.

In the technical solution of the present application, the coolant for cooling the cylinder body enters through the first water inlet pipe, and flows out from the first water outlet pipe and the second water outlet pipe respectively. When the coolant flows through the cylinder body, it takes away the heat of the cylinder body. Since the first water outlet pipe is arranged in the upper half of the cylinder body, and the second water outlet pipe is arranged in the lower half of the cylinder body. In this way, the coolant in the first water outlet pipe can take away the heat of the upper half of the cylinder body, and the coolant in the second water outlet pipe can take away the heat of the lower half of the cylinder body. Therefore, the technical solution can further reduce the uneven thermal deformation of the upper and lower parts of the cylinder body, reduce air leakage, and thus ensure the stable output power of the engine.

It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a schematic structural diagram of the coolant flow direction of each component in the engine cooling system of the present application.

FIG. 2 is a schematic diagram of the process steps of a first embodiment of a method for controlling an engine cooling system in the present application.

FIG. 3 is a schematic diagram of the process steps of a second embodiment of a method for controlling an engine cooling system in the present application.

FIG. 4 is a schematic diagram of the process steps of a third embodiment of a method for controlling an engine cooling system in the present application.

FIG. 5 is a schematic diagram of the process steps of a fourth embodiment of a method for controlling an engine cooling system in the present application.

The following are the descriptions of the reference numerals:
10. Cylinder; 21. First water inlet pipe; 22. Second water inlet pipe; 31. First water outlet pipe; 32. Second water outlet pipe; 33.
Cover body water outlet pipe; 41, first flow regulator; 42, second flow regulator; 43, first water outlet valve; 44, second water outlet valve; 51, water tank; 52, stepless water pump; 61, radiator; 62, thermostatic valve; 70, return pipe; 80, heating device; 81, Warm air heating pipe; 82, heating return pipe; 83, heating valve; 90, oil cooler; 91, cooler water supply pipe; 92, oil return pipe;
110. Cylinder block; 111. Upper section; 112. Lower section; 120. Cylinder head.

Detailed ways

Although the present application can be easily embodied in different forms of embodiments, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present application and is not intended to limit the present application to that described herein.

Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the application, rather than implying that each embodiment of the application must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the present application are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indications of these directions also change accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present application will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

The preferred implementation methods of the present application are further described in detail below in conjunction with the drawings of this specification.

Referring to FIG. 1 , the present application provides an engine cooling system. The power source of the engine mainly comes from the cylinder, and the cylinder 10 is a structure that converts the internal energy of the fuel into kinetic energy. The cylinder 10 generates a large amount of heat when converting kinetic energy. A large amount of heat will cause the engine temperature to be too high, and too high a temperature will produce many adverse results, such as deflagration, severe engine deformation, etc. Severe engine deformation will further lead to uneven matching between the piston and the cylinder 10, increased friction loss between the two, incomplete fuel combustion, etc., which will lead to unstable output power of the engine. For this reason, the engine cooling system is used to cool the cylinder 10 to avoid excessive temperature.

The engine cooling system includes: a cylinder 10, a first water inlet pipe 21, a first water outlet pipe 31 and a second water outlet pipe 32; the cold cylinder 10 includes a cylinder body 110, the inlet of the first water inlet pipe 21 is used to receive the coolant for cooling the cylinder body 110, and the outlet of the first water inlet pipe 21 is connected to the cylinder body 110; the coolant usually refers to water, and also includes a mixed solution of some antifreeze.

When the engine is running, the heat generated by the upper section 111 and the lower section 112 of the cylinder body 110 is different. The upper section 111 and the lower section 112 of the cylinder body 110 refer to the upper and lower ends parallel to the direction of piston movement when the engine is working normally. The end away from the piston is the lower section 112 of the cylinder body 110, and the end close to the piston is the upper section 111 of the cylinder body 110. In order to ensure that the deformation of the upper section 111 and the lower section 112 of the cylinder body 110 is more uniform. The first water outlet pipe 31 is provided in the upper section 111 of the cylinder body 110, and the second water outlet pipe 32 is provided in the lower section 112 of the cylinder body 110. The first water inlet pipe 21 is connected to the first water outlet pipe 31 and the second water outlet pipe 32, and the connecting position is located at the cylinder body 110.

The first water inlet pipe 21, the first water outlet pipe 31 and the second water outlet pipe 32 are usually connected in the cylinder block 110 to complete the heat exchange on the cylinder block 110. In order to increase the contact area, the first water inlet pipe 21, the first water outlet pipe 31 and the second water outlet pipe 32 are usually arranged around the inner wall or outer wall of the cylinder block 110. In this way, the coolant can flow along the wall of the cylinder block 110, taking away more More calories.

In the technical solution of this embodiment, the coolant for cooling the cylinder block 110 enters through the first water inlet pipe 21, and flows out from the first water outlet pipe 31 and the second water outlet pipe 32 respectively. When the coolant flows through the cylinder block 110, it takes away the heat of the cylinder block 110. Since the first water outlet pipe 31 is arranged at the upper half 111 of the cylinder block 110, and the second water outlet pipe 32 is arranged at the lower half 112 of the cylinder block 110. In this way, the coolant of the first water outlet pipe 31 can take away the heat of the upper half 111 of the cylinder block 110, and the coolant of the second water outlet pipe 32 can take away the heat of the lower half 112 of the cylinder block 110. Therefore, this technical solution can further reduce the uneven thermal deformation of the upper and lower parts of the cylinder block 110, reduce air leakage, and thus ensure the stable output power of the engine. It also further reduces the increase in friction loss between the piston and the cylinder 10 caused by deformation.

In order to more flexibly adjust the coolant flow of the upper half 111 and the lower half 112 of the cylinder body 110, the engine cooling system further includes: a first flow regulator 41 and a second flow regulator 42, the first flow regulator 41 is used to control the flow of the first water outlet pipe 31, and the second flow regulator 42 is used to control the flow of the second water outlet pipe 32. The first flow regulator 41 is arranged in the first water outlet pipe 31, and the second flow regulator 42 is arranged in the second water outlet pipe 32.

When the temperature of the upper section 111 of the cylinder body 110 is too high, the flow rate of the first water outlet pipe 31 is increased through the first flow regulator 41, thereby increasing heat exchange, taking away more heat from the upper section 111 of the cylinder body 110, and reducing the temperature of the upper section 111. On the contrary, if the temperature of the upper section 111 is too low, the flow rate of the first water outlet pipe 31 is reduced through the first flow regulator 41, thereby reducing heat exchange.

Similarly, when the temperature of the lower half 112 of the cylinder block 110 is too high, the flow rate of the second water outlet pipe 32 is increased through the second flow regulator 42, thereby increasing heat exchange, taking away more heat from the lower half 112 of the cylinder block 110, and reducing the temperature of the lower half 112. Conversely, if the temperature of the lower half 112 is too low, the flow rate of the second water outlet pipe 32 is reduced through the second flow regulator 42, thereby reducing the heat exchange of the lower half 112.

In addition, in order to make the flow regulation of the coolant smoother, the engine cooling system further includes: a water tank 51 and a stepless water pump 52, the water tank 51 is connected to the stepless water pump 52, and the stepless water pump 52 is connected to the first water inlet pipe 21. The water tank 51 is used to store the coolant and provide the coolant to the stepless water pump 52. The stepless water pump 52 is used to pump the coolant, generate pressure, extract the coolant from the water tank 51, and pump it to the cylinder 10.

The stepless water pump 52 can achieve stepless speed regulation, so that the flow rate of the coolant changes linearly. Therefore, the stepless water pump 52 can flexibly adjust the flow rate of the coolant within a specified flow rate range, thereby adjusting the flow rate of the coolant more smoothly and making the flow rate control more precise.

The engine usually generates a lot of heat when it is working. In order to dissipate heat more effectively, the engine cooling system also includes a radiator 61. One end of the radiator 61 is connected to the first flow regulator 41 and the second flow regulator 42 respectively, and the other end of the radiator 61 is connected to the stepless water pump 52. The radiator 61 is mainly used to dissipate heat and reduce the temperature of the coolant.

After the coolant cools the cylinder 10, the temperature is relatively high. If the coolant is circulated to cool the cylinder 10 again, the effect is not obvious and it is difficult to achieve effective cooling. However, through the setting of the radiator 61, the coolant flowing through the cylinder 10 will flow to the radiator 61. When the coolant flows through the radiator 61, the heat is transferred to the wall of the radiator 61, and the heat of the coolant is dissipated to the surrounding air through the contact between the radiator 61 and the air, thereby completing the cooling.

When the engine starts to operate, the internal temperature is relatively low. In order to make the fuel burn more fully, the internal temperature of the cylinder 10 must be maintained at a level not too low. To this end, the engine cooling system includes a thermostat valve 62, which is disposed in a pipeline between the first flow regulator 41 and the radiator 61.

When the engine starts to run, the thermostat valve 62 is closed to prevent the coolant from flowing through the radiator 61, which can reduce the heat dissipation and quickly heat up the cylinder 10. The thermostatic valve 62 allows the coolant to pass through the radiator 61 to dissipate heat.

In addition, when it is necessary to fully utilize the heat of the cylinder 10 , the thermostat valve 62 may be closed to use the heat of the cylinder 10 to operate other equipment, such as supplying the heating device 80 .

Furthermore, in order to ensure that the coolant can flow back to the stepless water pump 52 when the thermostat valve 62 is closed. In this embodiment, the engine cooling system includes a return pipe 70, one end of which is connected to the first flow regulator 41, and the other end of which is connected to the stepless water pump 52. When the thermostat valve 62 is closed, the coolant flows directly to the stepless water pump 52 after passing through the first flow regulator 41. Avoiding the radiator 61 and directly returning can reduce the dissipation of heat.

In order to further flexibly adjust the upper and lower layer temperatures of the cylinder body 110. The engine cooling system further includes: a first water outlet valve 43 and a second water outlet valve 44. The first water outlet valve 43 is provided in the first water outlet pipe 31 and is located between the first flow regulator 41 and the cylinder body 110; the second water outlet valve 44 is provided in the second water outlet pipe 32 and is located between the second flow regulator 42 and the cylinder body 110. The first water outlet valve 43 can control the opening and closing of the first water outlet pipe 31, and the second water outlet valve 44 can control the opening and closing of the second water outlet pipe 32.

For example, when the temperature of the upper section 111 of the cylinder block 110 is low, the connection between the upper section 111 of the cylinder block 110 and the first flow regulator 41 is disconnected through the first water outlet valve 43, thereby increasing the temperature of the upper section 111 of the cylinder block 110. When the temperature of the upper section 111 of the cylinder block 110 is high, the connection between the upper section 111 of the cylinder block 110 and the first flow regulator 41 is connected through the first water outlet valve 43, thereby decreasing the temperature of the upper section 111 of the cylinder block 110.

When the temperature of the lower half 112 of the cylinder block 110 is low, the second water outlet valve 44 disconnects the connection between the lower half 112 of the cylinder block 110 and the second flow regulator 42, thereby increasing the temperature of the lower half 112 of the cylinder block 110. When the temperature of the lower half 112 of the cylinder block 110 is high, the second water outlet valve 44 connects the connection between the lower half 112 of the cylinder block 110 and the second flow regulator 42, thereby decreasing the temperature of the lower half 112 of the cylinder block 110.

Of course, the first water outlet valve 43 and the second water outlet valve 44 can be disconnected at the same time, or can be connected at the same time.

The cylinder 10 also includes a cylinder head 120, which is mounted on the upper half 111 of the cylinder body 110; in order to make the overall deformation of the cylinder 10 more uniform, the cylinder head 120 also needs to be cooled. To this end, the engine cooling system also includes: a second water inlet pipe 22 and a cover body water outlet pipe 33, the inlet of the second water inlet pipe 22 is connected to the stepless water pump 52, and the outlet of the second water inlet pipe 22 is connected to the cylinder head 120; the coolant is pumped into the cylinder head 120 by the pumping pressure of the stepless water pump 52.

One end of the cover water outlet pipe 33 is connected to the cylinder head 120 and communicates with the second water inlet pipe 22 in the cylinder head 120, and the other end of the cover water outlet pipe 33 is connected to the first flow regulator 41. The coolant enters the cylinder head 120 through the second water inlet pipe 22 and flows out from the cover water outlet pipe 33. The coolant in the cylinder head 120 takes away the heat of the cylinder head 120.

It should be emphasized that the first water inlet pipe 21 and the second water inlet pipe 22 can share the same pipe section, that is, the water outlet of the stepless water pump 52 is connected to the common pipe, and the common pipe is then separately connected to the first water inlet pipe 21 and the second water inlet pipe 22. For example, a three-way valve is used to separately connect the common pipe to the first water inlet pipe 21 and the second water inlet pipe 22.

Generally speaking, the temperature of the cylinder head 120 is higher, so the cover water outlet pipe 33 of the cylinder head 120 is directly connected to the first flow regulator 41, and no valve is set in the cover water outlet pipe 33, and the cover water outlet pipe 33 remains in a normally open state.

In order to make full use of the heat of the engine, the engine cooling system includes: a warm air device 80, a warm air heating pipe 81 and a heating return pipe 82. One end of the warm air heating pipe 81 is connected to the cover water outlet pipe 33, and the other end is connected to the warm air device 80; one end of the heating return pipe 82 is connected to the warm air device 80, and the other end is connected to the first flow regulator 41. The warm air device 80 is used to heat the vehicle and increase the temperature of the vehicle's passenger space. The heat of the warm air device 80 comes from the engine, which can make full use of the heat of the engine, reduce fuel consumption, and achieve the purpose of energy saving.

Of course, when the vehicle is just started, the engine does not generate much heat, and the heat at this time needs to be used to maintain the engine running. It is difficult to supply the warm air device 80. To this end, the engine cooling system includes a heating valve 83, which is arranged in the warm air heating pipe 81. When the vehicle is just started and in the warm-up stage, the heating valve 83 is closed. At the same time, by connecting or disconnecting the heating valve 83, the connection and disconnection of the warm air heating pipe 81 can also be controlled, so as to better and flexibly control the heat output of the engine.

In order to make full use of the heat of the engine, the engine cooling system includes: an oil cooler 90, a cooler water supply pipe 91 and an oil return pipe 92. One end of the cooler water supply pipe 91 is connected to the stepless water pump 52, and the other end is connected to the oil cooler 90; one end of the oil return pipe 92 is connected to the oil cooler 90, and the other end is connected to the first flow regulator 41.

The oil cooler 90 has two working states. One is to heat the oil, which is mainly used when the vehicle is just starting up and the oil temperature is relatively low. In order to save heat, the thermostat 62 is closed, and the coolant passing through the cylinder 10 does not pass through the radiator 61, but directly flows back to the stepless water pump 52. This part of the coolant passes through the cylinder head and has a higher temperature. The stepless water pump 52 pumps the coolant with a higher temperature to the oil cooler 90 to complete the heating of the oil cooler 90, and the oil cooler 90 transfers the heat to the oil.

Another working state is to cool the engine oil. At this stage, the engine has been running for a while, the engine oil heats up quickly, and the temperature of the engine oil is higher than that of the coolant. At this time, the engine oil needs to be cooled. The thermostat valve 62 is opened, and the coolant passing through the cylinder 10 is dissipated by the radiator 61, and the coolant temperature is reduced. The coolant is pumped to the oil cooler 90 by the stepless water pump 52, taking away the heat of the oil cooler 90, thereby cooling the engine oil. It should be emphasized that the connecting pipeline between the oil cooler 90 and the stepless water pump 52 remains in a normally open state.

In the above embodiment, the first outlet valve 43 and the second outlet valve 44, as well as the thermostatic valve 62 and the heating valve 83 are all valves of the same type, for example, the same type of ball valves. The uniform valve type facilitates installation and reduces the possibility of installation errors.

Referring to FIG. 1 and FIG. 2 , the present application further provides a control method for an engine cooling system. The control method is used to control the engine cooling system in the above embodiment. The control method includes:

Step S10, obtaining the temperature parameters of the engine; temperature sensors are provided on various structural components of the engine, and the temperature of the engine is detected by the temperature sensors, thereby obtaining the temperature parameters of the engine.

Step S20, determining the operating stage of the engine according to the temperature parameters; for example, the engine has a warm-up stage and a normal operation stage. The engine has different temperature parameters in different operating stages, so the operating stage of the engine can be determined by the temperature parameters.

Step S30, according to the operation stage of the engine, respectively control the flow rate of the coolant in the first water outlet pipe 31 and the second water outlet pipe 32. The heat generated by the engine in different operation stages is different, and the cooling requirements are also different. Therefore, the flow rate control of the coolant is also different. Controlling the flow rate of the coolant in the first water outlet pipe 31 and the second water outlet pipe 32 respectively can better adapt to the operation condition of the engine and better ensure the normal operation of the engine.

Further, the cylinder 10 also includes a cylinder head 120, which is covered on the upper half 111 of the cylinder body 110; the engine cooling system includes: a first flow regulator 41, a second flow regulator 42, a water tank 51, a stepless water pump 52, a second water inlet pipe 22, a cover body water outlet pipe 33 and a heating valve 83, the first flow regulator 41 is arranged in the first water outlet pipe 31, the second flow regulator 42 is arranged in the second water outlet pipe 32, the water tank 51 is connected to the stepless water pump 52, the stepless water pump 52 is connected to the first water inlet pipe 21, the inlet of the second water inlet pipe 22 is connected to the stepless water pump 52, the outlet of the second water inlet pipe 22 is connected to the cylinder head 120, one end of the cover body water outlet pipe 33 is connected to the cylinder head 120, and is communicated with the second water inlet pipe 22 in the cylinder head 120, and the other end of the cover body water outlet pipe 33 is connected to the first flow regulator 41;

When the temperature of the upper section 111 of the cylinder body 110 is too high, the flow rate of the first water outlet pipe 31 is increased through the first flow regulator 41, thereby increasing heat exchange, taking away more heat from the upper section 111 of the cylinder body 110, and reducing the temperature of the upper section 111. On the contrary, if the temperature of the upper section 111 is too low, the flow rate of the first water outlet pipe 31 is reduced through the first flow regulator 41. amount, thereby reducing heat exchange.

Similarly, when the temperature of the lower section 112 of the cylinder block 110 is too high, the flow rate of the second water outlet pipe 32 is increased through the second flow regulator 42, thereby increasing heat exchange, taking away more heat from the lower section 112 of the cylinder block 110, and reducing the temperature of the lower section 112. Conversely, if the temperature of the lower section 112 is too low, the flow rate of the second water outlet pipe 32 is reduced through the second flow regulator 42, thereby reducing the heat exchange of the lower section 112.

In order to make full use of the heat of the engine, the engine cooling system also includes: a warm air device 80, a warm air heating pipe 81 and a heating return water pipe 82. One end of the warm air heating pipe 81 is connected to the cover body water outlet pipe 33, and the other end is connected to the warm air device 80. One end of the heating return water pipe 82 is connected to the warm air device 80, and the other end is connected to the first flow regulator 41. The heating valve 83 is arranged in the warm air heating pipe 81. The warm air device 80 is used to heat the vehicle and increase the temperature of the vehicle's passenger space. The heat of the warm air device 80 comes from the engine, which can make full use of the heat of the engine, reduce fuel consumption, and achieve the purpose of energy saving.

Referring to FIG. 3 , after the step of determining the operating stage of the engine according to the temperature parameter, the following steps are included:

Step S40: When the temperature of the engine is lower than the first temperature threshold, it is determined that the engine is running in the warm-up stage, and the heating valve 83 is closed; generally, when the engine is running in the warm-up stage, less heat is provided and the temperature is lower. In order to quickly heat up the engine, the heating valve 83 is closed.

Step S41, when the temperature of the engine is higher than the first temperature threshold and lower than the second temperature threshold, the heating valve 83 is opened in response to heating, wherein the first temperature threshold is lower than the second temperature threshold. When there is a heating demand and the temperature of the engine is already higher than the first temperature threshold, heat can be provided to the heating device. At this time, the heating valve 83 is opened, and the coolant with a higher temperature flows to the heating device, and heat is exchanged with the heating device, and the heating device transfers the heat to the passenger space of the vehicle. This method can improve the thermal efficiency of the engine, reduce the direct use of fuel by the heating device to heat up, and reduce fuel consumption.

In one aspect, the engine cooling system also includes: a radiator 61, a return pipe 70 and a thermostatic valve 62, one end of the radiator 61 is connected to the first flow regulator 41 and the second flow regulator 42 respectively, the other end of the radiator 61 is connected to the stepless water pump 52, one end of the return pipe 70 is connected to the first flow regulator 41, and the other end of the return pipe 70 is connected to the stepless water pump 52, and the thermostatic valve 62 is arranged in the pipeline between the first flow regulator 41 and the radiator 61.

The radiator 61 is mainly used to dissipate heat and reduce the temperature of the coolant. After the coolant cools the cylinder 10, the temperature is relatively high. If it is circulated to cool the cylinder 10 again, the effect is not obvious and it is difficult to achieve effective cooling. However, through the setting of the radiator 61, the coolant flowing through the cylinder 10 will flow to the radiator 61. When the coolant flows through the radiator 61, the heat is transferred to the wall of the radiator 61, and through the contact between the radiator 61 and the air, the heat of the coolant is dissipated to the surrounding air, thereby completing the cooling.

Referring to FIG. 4 , after the step of determining the operation stage of the engine according to the temperature parameter, the method further includes:

Step S50: When the temperature of the engine reaches a second temperature threshold, the thermostat valve 62 is controlled to open.

In order to conserve heat, the thermostat valve 62 is closed, and the coolant passing through the cylinder 10 does not pass through the radiator 61, but flows directly back to the stepless water pump 52. This part of the coolant passes through the cylinder head and has a higher temperature. The stepless water pump 52 pumps the coolant with a higher temperature to the oil cooler 90 to complete the heating of the oil cooler 90, and the oil cooler 90 transfers the heat to the oil. When the temperature of the engine is higher than the second temperature threshold, it means that the engine has generated excess heat, which is difficult to use and needs to be dissipated in time. For this reason, the thermostat valve 62 is opened, and the coolant with a higher temperature flows through the radiator 61, and the excess heat is dissipated in time through the radiator 61.

In this way, the heating device still has heating demand at this time, and the heating valve 83 can be kept open to continuously transfer the engine heat to the heating device.

On the other hand, the engine cooling system also includes: a first water outlet valve 43 and a second water outlet valve 44, the first water outlet valve 43 is arranged in the first water outlet pipe 31 and is located between the first flow regulator 41 and the cylinder body 110, and the second water outlet valve 44 is arranged in the second water outlet pipe 32 and is located between the second flow regulator 42 and the cylinder body 110.

Referring to FIG. 5 , the steps of controlling the flow of the coolant in the first water outlet pipe 31 and the second water outlet pipe 32 respectively according to the operation stage of the engine include:

Step S31, when the water temperature of the upper section 111 of the cylinder body 110 is higher than the third temperature threshold, the first water outlet valve 43 is controlled to open;

Step S32 , when the water temperature of the lower section 112 of the cylinder body 110 is higher than a third temperature threshold, the second water outlet valve 44 is controlled to open, wherein the second temperature threshold is lower than the third temperature threshold.

The upper section 111 and the lower section 112 of the cylinder body 110 are controlled separately and independently. When the third temperature threshold is reached, the corresponding valve can be opened to prevent the upper section 111 or the lower section 112 from being deformed too seriously.

Specifically, the first water outlet valve 43 can control the opening and closing of the first water outlet pipe 31 , and the second water outlet valve 44 can control the opening and closing of the second water outlet pipe 32 .

The present application also provides a vehicle, the vehicle comprising a frame and an engine cooling system, the frame forming a support space, the engine cooling system being arranged in the support space, and the frame being capable of protecting the engine cooling system.

Specifically, the engine cooling system includes: a cylinder 10, a first water inlet pipe 21, a first water outlet pipe 31 and a second water outlet pipe 32; the cold cylinder 10 includes a cylinder body 110, the inlet of the first water inlet pipe 21 is used to receive the coolant for cooling the cylinder body 110, and the outlet of the first water inlet pipe 21 is connected to the cylinder body 110; the coolant usually refers to water, and also includes a mixed solution of some antifreeze.

When the engine is running, the heat generated by the upper section 111 and the lower section 112 of the cylinder body 110 is different. The upper section 111 and the lower section 112 of the cylinder body 110 refer to the upper and lower ends parallel to the direction of piston movement when the engine is working normally. The end away from the piston is the lower section 112 of the cylinder body 110, and the end close to the piston is the upper section 111 of the cylinder body 110. In order to ensure that the deformation of the upper section 111 and the lower section 112 of the cylinder body 110 is more uniform. The first water outlet pipe 31 is arranged in the upper section 111 of the cylinder body 110, and the second water outlet pipe 32 is arranged in the lower section 112 of the cylinder body 110. The first water inlet pipe 21 is connected to the first water inlet pipe 31 and the second water outlet pipe 32, and the connecting position is located at the cylinder body 110.

The first water inlet pipe 21, the first water outlet pipe 31 and the second water outlet pipe 32 are usually connected in the cylinder block 110 to complete heat exchange on the cylinder block 110. In order to increase the contact area, the first water inlet pipe 21, the first water outlet pipe 31 and the second water outlet pipe 32 are usually arranged around the inner wall or the outer wall of the cylinder block 110. In this way, the coolant can flow along the wall of the cylinder block 110 to take away more heat.

In the vehicle of this embodiment, the coolant for cooling the cylinder block 110 enters through the first water inlet pipe 21 and flows out of the first water outlet pipe 22. The first water outlet pipe 31 and the second water outlet pipe 32 flow out. When the coolant flows through the cylinder body 110, it takes away the heat of the cylinder body 110. Since the first water outlet pipe 31 is arranged at the upper half 111 of the cylinder body 110, and the second water outlet pipe 32 is arranged at the lower half 112 of the cylinder body 110. In this way, the coolant of the first water outlet pipe 31 can take away the heat of the upper half 111 of the cylinder body 110, and the coolant of the second water outlet pipe 32 can take away the heat of the lower half 112 of the cylinder body 110. Therefore, the technical solution can further reduce the uneven thermal deformation of the upper and lower parts of the cylinder body 110, reduce air leakage, and thus ensure the stable output power of the engine. It also further reduces the increase in friction loss between the piston and the cylinder 10 caused by deformation.

Although the present application has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present application can be implemented in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

An engine cooling system, characterized in that the engine cooling system comprises:

A cylinder, wherein the cylinder comprises a cylinder body;

a first water inlet pipe, wherein the inlet of the first water inlet pipe is used to receive the coolant for cooling the cylinder block, and the outlet of the first water inlet pipe is connected to the cylinder block; and

A first water outlet pipe and a second water outlet pipe, wherein the first water outlet pipe is arranged at the upper half of the cylinder body, and the second water outlet pipe is arranged at the lower half of the cylinder body, and the first water inlet pipe is connected with both the first water outlet pipe and the second water outlet pipe, and the connection position is located at the cylinder body.
The engine cooling system according to claim 1 is characterized in that the engine cooling system further comprises: a first flow regulator and a second flow regulator, the first flow regulator is arranged in the first water outlet pipe, and the second flow regulator is arranged in the second water outlet pipe.
The engine cooling system according to claim 2 is characterized in that the engine cooling system further comprises: a water tank and a stepless water pump, the water tank is connected to the stepless water pump, and the stepless water pump is connected to the first water inlet pipe.
The engine cooling system according to claim 3 is characterized in that the engine cooling system further comprises: a radiator, one end of the radiator is connected to the first flow regulator and the second flow regulator respectively, and the other end of the radiator is connected to the stepless water pump.
The engine cooling system according to claim 4 is characterized in that the engine cooling system includes a thermostat valve, and the thermostat valve is arranged in a pipeline between the first flow regulator and the radiator.
The engine cooling system according to claim 3 is characterized in that the engine cooling system comprises a return pipe, one end of the return pipe is connected to the first flow regulator, and the other end of the return pipe is connected to the stepless water pump.
The engine cooling system according to claim 3, characterized in that the engine cooling system further comprises:

a first water outlet valve, the first water outlet valve being disposed in the first water outlet pipe and located between the first flow regulator and the cylinder body; and

A second water outlet valve is provided in the second water outlet pipe and is located between the second flow regulator and the cylinder body.
The engine cooling system according to claim 3, characterized in that the cylinder further comprises a cylinder head, and the cylinder head is disposed on the upper half of the cylinder body;

The engine cooling system further comprises:

a second water inlet pipe, wherein an inlet of the second water inlet pipe is connected to the stepless water pump, and an outlet of the second water inlet pipe is connected to the cylinder head; and

A cover body water outlet pipe, one end of which is connected to the cylinder head and communicates with the second water inlet pipe in the cylinder head, and the other end of which is connected to the first flow regulator.
The engine cooling system according to claim 8, characterized in that the engine cooling system comprises:

Heating device;

a warm air heating pipe, one end of which is connected to the cover water outlet pipe, and the other end of which is connected to the warm air device; and

A heating return pipe, one end of which is connected to the heating device, and the other end of which is connected to the first flow regulator.
The engine cooling system according to claim 9, characterized in that the engine cooling system includes a A heat valve is provided in the warm air heating pipe.
The engine cooling system according to claim 3, characterized in that the engine cooling system comprises:

An oil cooler, the oil cooler being used to reduce the temperature of the oil;

A cooler water supply pipe, one end of which is connected to the stepless water pump, and the other end of which is connected to the oil cooler;

An oil return pipe, one end of which is connected to the oil cooler, and the other end of which is connected to the first flow regulator.
A control method for an engine cooling system, characterized in that the control method is used to control the engine cooling system according to claim 1, and the control method comprises:

Acquiring temperature parameters of the engine;

determining an operating stage of the engine according to the temperature parameter;

According to the operation stage of the engine, the flow rates of the coolant in the first water outlet pipe and the second water outlet pipe are controlled respectively.
The control method of the engine cooling system according to claim 12, characterized in that:

The cylinder further comprises a cylinder head, and the cylinder head is disposed on the upper half of the cylinder body;

The engine cooling system comprises: a first flow regulator, a second flow regulator, a water tank, a stepless water pump, a second water inlet pipe, a cover water outlet pipe and a heating valve, wherein the first flow regulator is arranged in the first water outlet pipe, the second flow regulator is arranged in the second water outlet pipe, the water tank is connected to the stepless water pump, the stepless water pump is connected to the first water inlet pipe, the inlet of the second water inlet pipe is connected to the stepless water pump, the outlet of the second water inlet pipe is connected to the cylinder head, one end of the cover water outlet pipe is connected to the cylinder head and communicated with the second water inlet pipe in the cylinder head, and the other end of the cover water outlet pipe is connected to the first flow regulator;

The engine cooling system further comprises: a warm air device, a warm air supply pipe and a heating return pipe, one end of the warm air supply pipe is connected to the cover body water outlet pipe, and the other end is connected to the warm air device, one end of the heating return pipe is connected to the warm air device, and the other end is connected to the first flow regulator, and the heating valve is arranged in the warm air supply pipe;

After the step of determining the operating stage of the engine according to the temperature parameter, the method further comprises:

When the temperature of the engine is lower than a first temperature threshold, determining that the engine is running in a warm-up phase, and closing the heating valve;

When the temperature of the engine is higher than the first temperature threshold and lower than a second temperature threshold, the heating valve is opened in response to heating, wherein the first temperature threshold is lower than the second temperature threshold.
The control method of the engine cooling system according to claim 13 is characterized in that the engine cooling system further comprises: a radiator, a return pipe and a thermostatic valve, one end of the radiator is connected to the first flow regulator and the second flow regulator respectively, the other end of the radiator is connected to the stepless water pump, one end of the return pipe is connected to the first flow regulator, the other end of the return pipe is connected to the stepless water pump, and the thermostatic valve is arranged in the pipeline between the first flow regulator and the radiator;

After the step of determining the operating stage of the engine according to the temperature parameter, the method further comprises:

When the temperature of the engine reaches the second temperature threshold, the thermostat valve is controlled to open.
The control method of the engine cooling system according to claim 13 is characterized in that the engine cooling system further comprises: a first water outlet valve and a second water outlet valve, the first water outlet valve is arranged in the first water outlet pipe and is located between the first flow regulator and the cylinder body, and the second water outlet valve is arranged in the second water outlet pipe and is located between the first flow regulator and the cylinder body. between the second flow regulator and the cylinder body;

The step of controlling the flow rate of the coolant in the first water outlet pipe and the second water outlet pipe respectively according to the operation stage of the engine comprises:

When the water temperature of the upper half of the cylinder body is higher than a third temperature threshold, controlling the first water outlet valve to open;

When the water temperature in the lower half of the cylinder body is higher than a third temperature threshold, the second water outlet valve is controlled to open, wherein the second temperature threshold is lower than the third temperature threshold.
A vehicle, characterized in that the vehicle comprises a frame and an engine cooling system according to any one of claims 1 to 11, the frame forms a supporting space, and the engine cooling system is arranged in the supporting space.