Vehicle cooling system, control method and computer program product

Abstract

The invention discloses a vehicle heat dissipation system, a control method and a computer program product in the technical field of power system heat dissipation, and aims to solve the problem that in the prior art, the heat dissipation requirement under the low-output working condition of an engine is difficult to meet in a self-adaptive mode. The cooling device comprises a variable hydraulic pump and a fan, the fan is used for cooling the radiator, and the variable hydraulic pump is in transmission connection with a transmission shaft for driving an axle; the controller adjusts the opening degree of the variable hydraulic pump according to the backflow temperature of the radiator; the variable hydraulic pump takes power from the transmission shaft to ensure that the heat dissipation capacity of the radiator is roughly matched with the heat dissipation requirement of the vehicle, and the difference between the heat dissipation capacity of the radiator and the heat dissipation requirement of the vehicle is further reduced on the basis that the heat dissipation capacity of the radiator is roughly matched with the heat dissipation requirement of the vehicle based on the backflow temperature of the radiator. And effective heat dissipation can be carried out on the working conditions, such as downhill and deceleration, that the engine output power is low but the heat dissipation requirement is still high.

Description

Technical Field

[0001] The invention relates to a vehicle heat dissipation system, a control method and a computer program product, and belongs to the technical field of power system heat dissipation. Background Art

[0002] The main sources of heat in the vehicle are the engine and the retarder in the gearbox. Generally speaking, the cooling system in the vehicle is driven directly by the engine, so the engine power is positively correlated with the heat dissipation capacity of the cooling system.

[0003] Under some operating conditions, the engine power is low but the temperature inside the vehicle is high. For example, when the vehicle is going downhill or decelerating, the engine output power is low, but the retarder in the gearbox decelerates the drive shaft in order to cooperate with the brakes. During the deceleration process, mechanical energy is converted into heat energy, and the cooling system has a low heat dissipation capacity, resulting in a lack of heat dissipation in the vehicle.

[0004] In summary, the existing vehicle cooling system is difficult to adaptively meet the cooling needs under low engine output conditions. Summary of the invention

[0005] The purpose of the present application is to overcome the deficiencies in the prior art and to provide a vehicle cooling system, control method and computer program product that can adaptively meet cooling requirements under low engine output conditions.

[0006] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: In a first aspect, the present application provides a vehicle cooling system, comprising: A variable hydraulic pump and a fan, wherein the fan is connected to the variable hydraulic pump through a hydraulic oil pipe, the fan is used to dissipate heat for the radiator, and the variable hydraulic pump is connected to a transmission shaft for driving the axle; A controller and a temperature sensor, wherein the temperature sensor is used to measure the return temperature of the radiator, the controller is electrically connected to the temperature sensor and the variable hydraulic pump respectively, and the controller adjusts the opening of the variable hydraulic pump according to the return temperature of the radiator.

[0007] In some embodiments of the first aspect, the variable hydraulic pump takes power from a transfer case for driving the transmission shaft.

[0008] In some embodiments of the first aspect, a heat exchanger and a retarder return pipe are further included; the fluid heated in the heat exchanger flows back to the radiator through the heat dissipation return pipe; the retarder return pipe is used to dissipate heat from a retarder in a gearbox, and the fluid heated in the retarder return pipe dissipates heat through the heat exchanger; The temperature sensor is used to measure the temperature of the heat dissipation return pipe.

[0009] In some embodiments of the first aspect, an ambient temperature sensor for measuring ambient temperature is further included, and the ambient temperature sensor is electrically connected to the controller; the controller adjusts the opening of the variable hydraulic pump according to the temperature difference between the ambient temperature and the temperature of the heat dissipation return pipe.

[0010] In some embodiments of the first aspect, a heat dissipation drive pump is further included; the radiator outputs the heat-dissipated fluid to the heat-dissipation drive pump through a main output pipe, the heat-dissipation drive pump returns the heat-dissipated fluid to the radiator through a first branch output pipe, and the heat-dissipation drive pump also returns the heat-dissipated fluid to the heat exchanger through a second branch output pipe; the heat-dissipation drive pump is electrically connected to the controller, and the controller is used to control the flow rates of the first branch output pipe and the second branch output pipe.

[0011] In some embodiments of the first aspect, the heat dissipation drive pump draws power from an engine, and the radiator is also used for dissipating heat from the engine.

[0012] In a second aspect, the present application further provides a vehicle heat dissipation control method, which is executed by a controller in the vehicle heat dissipation system according to any embodiment of the first aspect, comprising: Acquire the reflux temperature and the ambient temperature of the radiator, and obtain a temperature difference value according to the reflux temperature of the radiator and the ambient temperature; The control range of the opening of the variable hydraulic pump is determined according to the return temperature of the radiator, and the opening of the variable hydraulic pump is controlled according to the temperature difference within the control range.

[0013] In some embodiments of the second aspect, Obtaining a heat dissipation efficiency value in advance according to a heat dissipation coefficient and a heat dissipation area of ​​the heat sink; Obtain the heat transfer coefficient of the retarder in the gearbox; The transfer loss is obtained according to the cross-sectional area of ​​the heat dissipation return pipe, the cross-sectional area of ​​the retarder pipe and the heat exchange coefficient of the heat exchanger; Correcting the heat dissipation efficiency value according to the transmission loss and the heat transfer coefficient to obtain a corrected heat dissipation efficiency value; Formulate a database according to the corrected heat dissipation efficiency value, the database including output flow values ​​corresponding to different temperature difference values ​​and different return temperatures of the radiator; The control range of the opening of the variable hydraulic pump is determined according to the return temperature of the radiator, and the opening of the variable hydraulic pump is controlled according to the temperature difference within the control range, including finding a corresponding output flow value in the database according to the temperature difference and the return temperature of the radiator, and issuing an opening control command to the variable hydraulic pump according to the output flow value.

[0014] In some embodiments of the second aspect, finding a corresponding output flow value in the database according to the temperature difference value and the reflux temperature of the radiator further includes: Get the engine speed and torque; In response to the rotation speed of the engine reaching a first threshold and the torque of the engine reaching a second threshold, the output flow value is controlled not to exceed a third threshold.

[0015] In a third aspect, the present application further provides a computer program product, comprising a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the vehicle heat dissipation control method described in any embodiment of the second aspect are implemented.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The vehicle cooling system, control method and computer program product provided by the present application ensure that the cooling capacity of the radiator roughly matches the cooling demand of the vehicle by taking power from the transmission shaft through a variable hydraulic pump, further reduce the gap between the cooling capacity of the radiator and the cooling demand of the vehicle on the basis of the rough match between the cooling capacity of the radiator and the cooling demand of the vehicle based on the return temperature of the radiator, and effectively dissipate heat for working conditions where the engine output power is low but the cooling demand is still high, represented by downhill and deceleration. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 is a schematic structural diagram of a vehicle cooling system provided in this embodiment; Figure 2 is a structural schematic diagram of a vehicle heat dissipation control method provided in this embodiment; In the figure: 1. Engine; 2. Gearbox; 3. Drive shaft; 4. Transfer case; 5. Axle; 6. Cooling drive pump; 7. Cooling return pipe; 8. Heat exchanger; 9. Retarder return pipe; 10. Fan; 11. Radiator; 12. Temperature sensor; 13. Hydraulic motor; 14. Hydraulic oil pipe; 15. Controller; 16. Sub-controller; 17. Electrical wiring harness; 18. Variable hydraulic pump; 19. Main output pipe; 19.1. First sub-output pipe; 19.2. Second sub-output pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this application / this application to clearly and completely describe the technical solutions in the embodiments of this application / this application. Obviously, the described embodiments are only part of the embodiments of this application / this application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the application / this application and its application or use. Embodiment 1

[0020] This embodiment provides a vehicle cooling system to solve the problem in the prior art that the vehicle cooling system is difficult to adaptively meet the cooling demand of the engine 1 under low output conditions.

[0021] refer to Figure 1 The vehicle cooling system provided in this embodiment includes a variable hydraulic pump 18 and a fan 10, wherein the fan 10 is connected to the variable hydraulic pump 18 through a hydraulic oil pipe 14, the fan 10 is used to dissipate heat for the radiator 11, and the radiator 11 is used to dissipate heat for various components in the vehicle (such as the engine 1 and the retarder in the gearbox 2), the variable hydraulic pump 18 is connected to the transmission shaft 3 for driving the axle 5, that is, the variable hydraulic pump 18 skips the engine 1 and has the same power source as the axle 5; the vehicle cooling system also includes a controller 15 and a temperature sensor 12, the temperature sensor 12 is used to measure the return temperature of the radiator 11, the return temperature of the radiator 11 can represent the matching degree between the heat dissipation capacity of the radiator 11 and the heat dissipation demand, the controller 15 is connected to the temperature sensor 12 and the variable hydraulic pump 18 by electrical signals respectively, and the controller 15 adjusts the opening of the variable hydraulic pump 18 according to the return temperature of the radiator 11, thereby improving and maintaining the matching degree between the heat dissipation capacity of the radiator 11 and the heat dissipation demand.

[0022] Non-exclusive method of use: deploy the vehicle cooling system provided by this embodiment in the power system of the vehicle; under normal working conditions, the variable hydraulic pump 18 takes power from the transmission shaft 3 to drive the hydraulic oil pipe 14 to flow, and the flow of the hydraulic oil pipe 14 drives the fan 10 to rotate, and the fan 10 is used to dissipate heat for the radiator 11, so the heat dissipation efficiency of the radiator 11 is positively correlated with the vehicle speed represented by the transmission shaft 3; in most cases, the vehicle speed is positively correlated with the output power of the engine 1, and the output power of the engine 1 is positively correlated with the heat dissipation demand in the vehicle. At this time, the heat dissipation efficiency of the radiator 11 is roughly matched with the heat dissipation demand in the vehicle; for the heat dissipation of the radiator 11 The remaining gap between the thermal efficiency and the heat dissipation demand in the vehicle will be directly reflected in the reflux temperature of the radiator 11. At this time, the controller 15 adjusts the opening of the variable hydraulic pump 18 according to the reflux temperature of the radiator 11; within the power taking range of the variable hydraulic pump 18 from the transmission shaft 3, the larger the opening of the hydraulic pump 18, the larger the output flow of the hydraulic oil pipe 14. Controlling the output flow of the hydraulic oil pipe 14 can make up for the remaining gap between the heat dissipation efficiency of the radiator 11 and the heat dissipation demand in the vehicle, ensuring that the heat dissipation efficiency of the radiator 11 is highly matched with the heat dissipation demand in the vehicle, and realizing adaptive adjustment of the heat dissipation efficiency of the radiator 11 according to the heat dissipation demand.

[0023] When the vehicle starts to decelerate or go downhill from high speed, the output power of the engine 1 is low, or even in neutral and flameout state, but the retarder inside the vehicle power system will convert the speed of the transmission shaft 3 into heat energy in order to reduce the speed of the transmission shaft 3, that is, to reduce the vehicle speed. At this time, the vehicle still has a large heat dissipation demand, and the heat dissipation demand under this condition is positively correlated with the speed of the transmission shaft 3, that is, positively correlated with the vehicle speed. In the vehicle heat dissipation system provided by this embodiment, the variable hydraulic pump 18 skips the engine 1 to take power from the transmission shaft 3, so that the heat dissipation efficiency of the radiator 11 can be matched with the heat dissipation demand under deceleration or downhill conditions, and the control of the opening of the variable hydraulic pump 18 based on the reflux temperature fills the gap between the heat dissipation efficiency of the radiator 11 and the heat dissipation demand.

[0024] The vehicle cooling system provided in this embodiment can be combined with a conventional vehicle cooling system that draws power from the engine 1 to cover cooling requirements under more comprehensive working conditions.

[0025] In summary, the vehicle cooling system provided in this embodiment takes power from the transmission shaft 3 through the variable hydraulic pump 18 to ensure that the cooling capacity of the radiator 11 roughly matches the cooling demand of the vehicle, and further reduces the gap between the cooling capacity of the radiator 11 and the cooling demand of the vehicle on the basis of the roughly matching of the cooling capacity of the radiator 11 and the cooling demand of the vehicle based on the return temperature of the radiator 11. It can also effectively dissipate heat for working conditions where the output power of the engine 1 is low but the cooling demand is still high, such as downhill and deceleration. Embodiment 2

[0026] This embodiment provides a vehicle cooling system. This embodiment is optimized on the basis of the first embodiment to improve the technical effect and refine the technical solution. For the contents not fully described in this embodiment, please refer to the first embodiment.

[0027] Generally speaking, the heat dissipation requirements of a vehicle are generally the heat dissipation requirements of the engine 1 and the heat dissipation requirements of the retarder in the gearbox 2, and the two are generally separated from the transmission shaft 3 by a certain distance. Figure 1 In order to reduce the size and conduction loss of the hydraulic oil pipe 14, the variable hydraulic pump 18 does not directly take power from the drive shaft 3, but takes power from the transfer case 4 used to drive the drive shaft 3; another significant advantage is that there are many gears with different speeds in the transfer case 4, and the variable hydraulic pump 18 can take power from the gears with suitable speeds, or new gears can be arranged in the transfer case 4 to take power for the variable hydraulic pump 18, so as to avoid the problem of poor matching between the torque speed of the variable hydraulic pump 18 and the torque speed of the drive shaft 3.

[0028] As one example, refer to Figure 1 The vehicle cooling system also includes a heat exchanger 8 and a retarder return pipe 9; the fluid heated in the heat exchanger 8 flows back to the radiator 11 through the heat dissipation return pipe 7; the retarder return pipe 9 is used to dissipate the retarder in the gearbox 2, the retarder return pipe 9 penetrates from the outside of the gearbox 2 into the gearbox 2 and is in thermal contact with the retarder, and the heated fluid in the retarder return pipe 9 dissipates heat through the heat exchanger 8. The temperature sensor 12 is used to measure the temperature of the heat dissipation return pipe 7, and the temperature of the heat dissipation return pipe 7 can directly represent the temperature of the retarder and the gap between the heat dissipation efficiency of the radiator 11 and the heat dissipation demand of the retarder.

[0029] As one of the embodiments, the vehicle cooling system also includes an ambient temperature sensor for measuring the ambient temperature, and the ambient temperature sensor is electrically connected to the controller 15; the controller 15 adjusts the opening of the variable hydraulic pump 18 according to the temperature difference between the ambient temperature and the temperature of the cooling return pipe 7; when the power system cooling demand is certain, the temperature difference is larger when the ambient temperature is lower, and the spontaneous cooling efficiency of the power system is stronger at this time, and the opening of the variable hydraulic pump 18 can be controlled to be smaller; when the ambient temperature is higher, the temperature difference is smaller, and the spontaneous cooling efficiency of the power system is weak at this time, and the opening of the variable hydraulic pump 18 can be controlled to be larger to improve the cooling efficiency.

[0030] As one of the embodiments, the vehicle cooling system also includes a cooling drive pump 6 for driving the radiator 11 to exchange heat with the power system; the outlet of the driving pump 6 is connected to the radiator 11 through the main output pipe 19. Under the drive of the driving pump 6, the radiator 11 outputs the heat-dissipated fluid through the main output pipe 19 to the cooling drive pump 6. The cooling drive pump 6 returns the heat-dissipated fluid to the radiator 11 through the first branch output pipe 19.1. The cooling drive pump 6 also returns the heat-dissipated fluid to the heat exchanger 8 through the second branch output pipe 19.2. Heat exchange occurs in the heat exchanger 8 between the output fluid of the second branch output pipe 19.2 and the retarder return pipe 9. After being heated, the output fluid of the second branch output pipe 19.2 returns from the cooling return pipe 7 to the radiator 11 for cooling; the cooling drive pump 6 is connected to the controller 15 by electrical signals. The controller 15 is used to control the flow rates of the first branch output pipe 19.1 and the second branch output pipe 19.2.

[0031] It is not difficult for those skilled in the art to see that, in addition to controlling the heat dissipation efficiency of the radiator 11 by controlling the opening of the variable hydraulic pump 18 according to the reflux temperature and the temperature difference, the controller 15 can also control the heat dissipation efficiency of the radiator 11 by distributing the flow of the first branch output pipe 19.1 and the second branch output pipe 19.2.

[0032] As one of the embodiments, the heat dissipation drive pump 6 draws power from the engine 1, and the pumping rate of the heat dissipation drive pump 6 is positively correlated with the speed and torque of the engine 1. Within the upper limit of the heat dissipation efficiency of the radiator 11, controlling the pumping speed of the heat dissipation drive pump 6 is to control the actual heat dissipation efficiency. The radiator 11 is also used for heat dissipation of the engine 1. In this way, the vehicle cooling system provided in this embodiment can also meet the matching degree between the heat dissipation efficiency of the radiator 11 and the heat dissipation requirements of the engine 1 under the conditions of high speed, torque and low vehicle speed of the engine 1.

[0033] As one embodiment, the controller 15 may be a vehicle VCU.

[0034] As one example, refer to Figure 1 The hydraulic oil pipe 14 is connected to and drives the hydraulic motor 13, and the hydraulic motor 13 is used to drive the fan 10 to rotate.

[0035] As one example, refer to Figure 1 The controller 15 is electrically connected to the sub-controller 16 , and the sub-controller 1 is electrically connected to the variable hydraulic pump 18 via the electrical wiring harness 17 . The controller 15 issues an execution instruction to the sub-controller 16 , and the sub-controller 16 controls the opening of the variable hydraulic pump 18 instead of the controller 15 .

[0036] In summary, the vehicle cooling system provided in this embodiment mainly improves the matching degree of the cooling efficiency of the radiator 11 with the cooling requirements at different ambient temperatures and the cooling requirements of the engine 1, and also provides a new means of controlling the cooling efficiency. Embodiment 3

[0037] refer to Figure 2 This embodiment provides a vehicle heat dissipation control method, which is applicable to the vehicle heat dissipation system provided in embodiment one or two and can be executed by the controller 15.

[0038] The vehicle heat dissipation control method provided in this embodiment has the technical effects corresponding to those of Embodiment 1 or 2, which will not be described in detail here.

[0039] The vehicle heat dissipation control method provided in this embodiment includes obtaining the return temperature and ambient temperature of the radiator 11, and obtaining a temperature difference value based on the return temperature of the radiator 11 and the ambient temperature; determining a control range of the opening of the variable hydraulic pump 18 based on the return temperature of the radiator 11; and controlling the opening of the variable hydraulic pump 18 based on the temperature difference value within the control range.

[0040] The vehicle heat dissipation control method provided in this embodiment substantially determines the main range of heat dissipation efficiency based on the reflux temperature of the radiator 11. The main range of heat dissipation efficiency determines the control range of the opening of the variable hydraulic pump 18, and also determines the output flow of the hydraulic oil pipe 14, the speed of the fan 10 and the heat dissipation efficiency of the radiator 11. After determining the control range of the opening of the variable hydraulic pump 18, the opening of the variable hydraulic pump 18 is fine-tuned according to the temperature difference value to ensure the matching degree between the heat dissipation efficiency of the radiator 11 and the heat dissipation demand.

[0041] As one embodiment, the heat dissipation efficiency value is obtained in advance according to the heat dissipation coefficient and the heat dissipation area of ​​the heat sink 11; Obtaining a heat transfer coefficient of the retarder in the gearbox 2, where the heat transfer coefficient of the retarder represents the heat transfer efficiency between the retarder and the retarder return pipe 9; The transfer loss is obtained according to the cross-sectional area of ​​the heat dissipation return pipe 7, the cross-sectional area of ​​the retarder pipe 9 and the heat exchange coefficient of the heat exchanger 8. Generally speaking, the smaller the cross-sectional area of ​​the heat dissipation return pipe 7 and the cross-sectional area of ​​the retarder pipe 9, the larger the unit surface area per unit volume of fluid is on average, the higher the external heat radiation efficiency of the heat dissipation return pipe 7 and the retarder pipe 9 themselves is, and the smaller the heat dissipation burden of the radiator 11 is; Correct the heat dissipation efficiency value according to the transmission loss and the heat transfer coefficient to obtain a corrected heat dissipation efficiency value; A database is formulated according to the corrected heat dissipation efficiency value, the database including output flow values ​​corresponding to different temperature difference values ​​and different return temperatures of the radiator 11, and this step is intended to reduce the amount of calculation of the controller 15 by using the preset database; As mentioned before, the control range of the opening of the variable hydraulic pump 18 is determined according to the return temperature of the radiator 11, and the opening of the variable hydraulic pump 18 is controlled according to the temperature difference within the control range, including finding the corresponding output flow value in the database according to the temperature difference and the return temperature of the radiator 11, and issuing a control command to the variable hydraulic pump 18 according to the output flow value, that is, a command for the opening size.

[0042] This step aims to improve the actual matching degree between the heat dissipation capacity of the radiator 11 and the heat dissipation demand by correcting the information source.

[0043] As one embodiment, the corresponding output flow value is found in the database according to the temperature difference value and the return temperature of the radiator 11, and the speed and torque of the engine 1 are obtained; in response to the speed of the engine 1 reaching the first threshold value, the torque of the engine 1 reaching the second threshold value, indicating that the vehicle is in a climbing condition, and the output flow value is controlled not to exceed the third threshold value. This step is intended to temporarily reduce the power output of the variable hydraulic pump 18 when the vehicle is climbing by controlling the output flow value to ensure the torque of the transmission shaft 3. Embodiment 4

[0044] This embodiment provides a computer program product, on which a computer program is stored, and when the program is executed by a processor, the steps of the vehicle heat dissipation control method provided in Embodiment 3 are implemented. The computer program product provided in this embodiment can be transmitted, distributed and downloaded in the form of a signal via the Internet.

[0045] The computer program product provided in this embodiment has the same technical effects as those of the third embodiment, which will not be described in detail here. Embodiment 5

[0046] This embodiment provides a vehicle cooling system. This embodiment is optimized on the basis of Embodiment 1 or 2 to improve the technical effect and refine the technical solution. For the contents not fully described in this embodiment, please refer to Embodiment 1 or 2.

[0047] In the vehicle cooling system provided in this embodiment, the controller 15 is used to: obtain the return temperature and the ambient temperature of the radiator 11, and obtain the temperature difference value according to the return temperature and the ambient temperature of the radiator 11; The control range of the opening degree of the variable hydraulic pump 18 is determined according to the return temperature of the radiator 11 , and the opening degree of the variable hydraulic pump 18 is controlled according to the temperature difference within the control range.

[0048] As one embodiment, the controller 15 is further used to obtain the heat dissipation efficiency value according to the heat dissipation coefficient and the heat dissipation area of ​​the heat sink 11 in advance; Obtaining the heat transfer coefficient of the retarder in the gearbox 2; The transfer loss is obtained according to the cross-sectional area of ​​the heat dissipation return pipe 7, the cross-sectional area of ​​the retarder pipe 9 and the heat exchange coefficient of the heat exchanger 8; Correct the heat dissipation efficiency value according to the transmission loss and the heat transfer coefficient to obtain a corrected heat dissipation efficiency value; Formulate a database according to the corrected heat dissipation efficiency value, the database including output flow values ​​corresponding to different temperature difference values ​​and different return temperatures of the radiator 11; The control range of the opening of the variable hydraulic pump 18 is determined according to the return temperature of the radiator 11, and the opening of the variable hydraulic pump 18 is controlled according to the temperature difference within the control range, including finding the corresponding output flow value in the database according to the temperature difference and the return temperature of the radiator 11, and issuing an opening control command to the variable hydraulic pump 18 according to the output flow value.

[0049] As one embodiment, the controller 15 is also used to obtain the speed and torque of the engine 1; In response to the rotation speed of the engine 1 reaching the first threshold, the torque of the engine 1 reaching the second threshold, and the output flow value being controlled not to exceed the third threshold.

[0050] The additional technical effects of the vehicle cooling system provided by this embodiment can be found in Embodiment 3 and will not be described in detail here.

[0051] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0052] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0053] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0054] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0055] In the description of the present invention, it should be understood 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 present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "provided at", "provided with", "located", "installed", "set", etc. 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 directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. "Hinged" includes "rotational connection".

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vehicle cooling system, characterized in that: include, A variable hydraulic pump (18) and a fan (10), wherein the fan (10) is in driving connection with the variable hydraulic pump (18) via a hydraulic oil pipe (14), the fan (10) is used to dissipate heat for a radiator (11), and the variable hydraulic pump (18) is in driving connection with a transmission shaft (3) used to drive an axle (5); A controller (15) and a temperature sensor (12), wherein the temperature sensor (12) is used to measure the return temperature of the radiator (11), and the controller (15) is respectively connected to the temperature sensor (12) and the variable hydraulic pump (18) via electrical signals, and the controller (15) adjusts the opening of the variable hydraulic pump (18) according to the return temperature of the radiator (11).

2. The vehicle cooling system according to claim 1, characterized in that: The variable hydraulic pump (18) takes power from a transfer case (4) for driving the transmission shaft (3).

3. The vehicle cooling system according to claim 1, characterized in that: It also includes a heat exchanger (8) and a retarder return pipe (9); the fluid heated in the heat exchanger (8) flows back to the radiator (11) through the heat dissipation return pipe (7); the retarder return pipe (9) is used to dissipate heat from the retarder in the gearbox (2); the fluid heated in the retarder return pipe (9) dissipates heat through the heat exchanger (8); The temperature sensor (12) is used to measure the temperature of the heat dissipation return pipe (7).

4. The vehicle cooling system according to claim 3, characterized in that: It also includes an ambient temperature sensor for measuring ambient temperature, the ambient temperature sensor being electrically connected to the controller (15); the controller (15) adjusting the opening of the variable hydraulic pump (18) according to the temperature difference between the ambient temperature and the temperature of the heat dissipation return pipe (7).

5. The vehicle cooling system according to claim 3, characterized in that: The heat dissipation drive pump (6) is also included; the radiator (11) outputs the heat-dissipated fluid to the heat-dissipation drive pump (6) through the main output pipe (19); the heat-dissipation drive pump (6) returns the heat-dissipated fluid to the radiator (11) through the first branch output pipe (19.1); the heat-dissipation drive pump (6) also returns the heat-dissipated fluid to the heat exchanger (8) through the second branch output pipe (19.2); the heat-dissipation drive pump (6) is electrically connected to the controller (15); the controller (15) is used to control the flow rates of the first branch output pipe (19.1) and the second branch output pipe (19.2).

6. The vehicle cooling system according to claim 5, characterized in that: The heat dissipation drive pump (6) draws power from the engine (1), and the radiator (11) is also used for heat dissipation of the engine (1).

7. A vehicle heat dissipation control method, characterized in that: Executed by a controller (15) in a vehicle cooling system according to any one of claims 1 to 6, comprising: Acquiring a reflux temperature and an ambient temperature of the radiator (11), and obtaining a temperature difference value according to the reflux temperature of the radiator (11) and the ambient temperature; A control range of the opening of the variable hydraulic pump (18) is determined according to the return temperature of the radiator (11), and the opening of the variable hydraulic pump (18) is controlled according to the temperature difference within the control range.

8. The vehicle heat dissipation control method according to claim 7, characterized in that: Obtaining a heat dissipation efficiency value in advance based on the heat dissipation coefficient and the heat dissipation area of ​​the heat sink (11); Obtaining a heat transfer coefficient of a retarder in a gearbox (2); Obtaining the transfer loss according to the cross-sectional area of ​​the heat dissipation return pipe (7), the cross-sectional area of ​​the retarder pipe (9) and the heat exchange coefficient of the heat exchanger (8); Correcting the heat dissipation efficiency value according to the transmission loss and the heat transfer coefficient to obtain a corrected heat dissipation efficiency value; A database is prepared according to the corrected heat dissipation efficiency value, wherein the database includes output flow values ​​corresponding to different temperature difference values ​​and different return temperatures of the heat sink (11); The control range of the opening of the variable hydraulic pump (18) is determined according to the return temperature of the radiator (11), and the opening of the variable hydraulic pump (18) is controlled according to the temperature difference within the control range. The method comprises finding a corresponding output flow value in the database according to the temperature difference value and the return temperature of the radiator (11), and issuing an opening control command to the variable hydraulic pump (18) according to the output flow value.

9. The vehicle heat dissipation control method according to claim 8, characterized in that: Finding a corresponding output flow value in the database according to the temperature difference value and the return temperature of the radiator (11), further comprising: Obtaining the speed and torque of the engine (1); In response to the rotation speed of the engine (1) reaching a first threshold value and the torque of the engine (1) reaching a second threshold value, the output flow value is controlled not to exceed a third threshold value.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the vehicle heat dissipation control method described in any one of claims 7 to 9 are implemented.

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