Hydraulic heat dissipation control system, method, and work machine

Abstract

The present application belongs to the field of hydraulic control, and particularly relates to a hydraulic heat dissipation control system, method and working machine. The hydraulic heat dissipation control system comprises: a heat dissipation motor; an oil supply oil circuit for providing high-pressure hydraulic oil for the heat dissipation motor; a proportional control valve group arranged on the oil supply oil circuit, the proportional control valve group being used for adjusting the hydraulic oil input flow of the heat dissipation motor; a temperature detection member for obtaining the current temperature of a region to be heat-dissipated corresponding to the heat dissipation motor; and a controller in communication connection with the proportional control valve group and the temperature detection member and configured to: determine the heat dissipation requirement of the region to be heat-dissipated according to the current temperature; and adjust the control current input to the proportional control valve group according to the heat dissipation requirement, so as to adjust the rotating speed of the heat dissipation motor. The above-mentioned hydraulic heat dissipation control system can precisely adjust the rotating speed of the heat dissipation motor, so that the heat dissipation rate is matched with the heat dissipation requirement.

Description

Hydraulic cooling control system, method and operating machinery Technical Field

[0001] This invention belongs to the field of hydraulic control, and specifically relates to a hydraulic cooling control system, method, and working machinery. Background Technology

[0002] In large construction machinery, high-power engines have limited self-heating capacity and require a hydraulic cooling control system to dissipate engine coolant and intake air temperatures, matching different cooling requirements according to different temperatures. In this hydraulic cooling control system, a cooling motor drives the fan blades, thus requiring the cooling motor speed to be controlled based on temperature.

[0003] In existing technologies, hydraulic pumps are typically driven by an engine. Changes in engine speed cause the hydraulic pump speed to increase. A proportional relief valve is usually connected to both ends of the cooling motor to regulate the pressure of the cooling motor, thus maintaining a constant rotation speed at high speeds. However, under high-speed engine conditions, the hydraulic pump rotates at high speed along with the engine, causing an increase in the overflow flow of the relief valve. If the overflow is not timely, the overflow pressure will increase, leading to inaccurate speed control of the cooling motor. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic cooling control system, method, and working machinery to solve the technical problem of low speed control accuracy of cooling motors in the prior art.

[0005] To achieve the above objectives, the present invention provides a hydraulic cooling control system, which includes:

[0006] Cooling motor;

[0007] The oil supply circuit is used to provide high-pressure hydraulic oil to the cooling motor;

[0008] The proportional control valve assembly is located on the oil supply line and is used to adjust the hydraulic oil input flow of the cooling motor.

[0009] Temperature sensing element, used to obtain the current temperature of the area to be cooled corresponding to the cooling motor;

[0010] The controller is communicatively connected to both the proportional control valve assembly and the temperature sensor and is configured to: determine the heat dissipation requirements of the area to be cooled based on the current temperature; and adjust the control current input to the proportional control valve assembly according to the heat dissipation requirements to adjust the speed of the cooling motor.

[0011] In some embodiments, the hydraulic cooling control system further includes a hydraulic oil tank and a hydraulic pump. The hydraulic pump is located on the oil inlet line between the hydraulic oil tank and the proportional control valve assembly. The proportional control valve assembly includes: a throttling element, whose two ends are respectively connected to the oil outlet of the hydraulic pump and the oil inlet of the cooling motor and is used to throttle the hydraulic oil input to the cooling motor; a proportional control element, which is communicatively connected to the controller and is used to adjust the hydraulic oil flow rate through the throttling element according to the control current input by the controller; and a pressure control element, which is used to limit the hydraulic oil pressure difference across the throttling element.

[0012] In some embodiments, the throttling element and the proportional control element are integrated into an electro-proportional throttling valve, the pressure control element is a first pilot relief valve, the controller is used to adjust the control current input to the electro-proportional throttling valve according to the heat dissipation requirements, the oil inlet and pilot port of the first pilot relief valve are respectively connected to the oil inlet and oil outlet of the electro-proportional throttling valve, and the oil outlet of the first pilot relief valve is connected to the hydraulic oil tank.

[0013] In some embodiments, the hydraulic cooling control system further includes: a pilot relief valve assembly, which is located on the connecting oil line between the outlet end of the hydraulic pump and the return oil line. The pilot relief valve assembly is communicatively connected to a controller, which is further configured to: adjust the relief pressure of the pilot relief valve assembly to a preset pressure value when the cooling demand is determined to be greater than zero; and adjust the relief pressure of the pilot relief valve assembly to zero when the cooling demand is determined to be zero, so as to connect the outlet end of the hydraulic pump and the return oil line.

[0014] In some embodiments, the pilot relief valve assembly includes: a second pilot relief valve, the inlet and outlet of which are respectively connected to the outlet end of the hydraulic pump and the return oil circuit; and a switching valve, both ends of which are respectively connected to the pilot port of the second pilot relief valve and the return oil circuit. The switching valve is communicatively connected to a controller, which controls the switching valve to be turned on or off. When the switching valve is turned on, it adjusts the relief pressure to zero. When the switching valve is turned off, it adjusts the relief pressure to a preset pressure value.

[0015] In some implementations, the throttling element is a damping valve, and the proportional control element and pressure control element are integrated into an electro-proportional pilot-operated relief valve. The oil inlet and pilot port of the electro-proportional pilot-operated relief valve are connected to the oil inlet and outlet of the damping valve, respectively, and the oil outlet of the electro-proportional pilot-operated relief valve is connected to the hydraulic oil tank.

[0016] In some implementations, the hydraulic cooling control system further includes a relief valve, the two ends of which are connected to the hydraulic pump and the return oil circuit, respectively.

[0017] In some implementations, the controller is also configured to adjust the overflow pressure of the electro-proportional pilot relief valve to zero when the heat dissipation requirement is determined to be zero.

[0018] In some embodiments, the hydraulic cooling control system further includes a speed detection device for detecting the cooling motor, and the controller is further configured to: determine the required cooling speed of the cooling motor based on the cooling demand; determine the current speed of the cooling motor based on the detection signal emitted by the speed detection device; compare the current speed with the required cooling speed; and adjust the control current based on the comparison result.

[0019] In some embodiments, there are multiple cooling motors and multiple proportional control valve assemblies, with each proportional control valve assembly connected to a corresponding cooling motor. The hydraulic cooling control system also includes a flow divider valve, which includes an inlet end connected to the outlet end of the hydraulic pump and multiple outlet ends connected to the inlet ends of the multiple proportional control valve assemblies. The multiple outlet ends can distribute hydraulic oil to the multiple proportional control valve assemblies according to a preset flow ratio.

[0020] A second aspect of the present invention provides a working machine, including the above-described hydraulic cooling control system.

[0021] A third aspect of the present invention provides a hydraulic cooling control method, applied in the aforementioned hydraulic cooling control system. The hydraulic cooling control system further includes a speed detection device for detecting the speed of the cooling motor. The hydraulic cooling control method includes: determining the cooling demand of the area to be cooled based on the current temperature; determining the cooling speed of the cooling motor based on the cooling demand; determining the current speed of the cooling motor based on the detection signal emitted by the speed detection device; comparing the current speed with the cooling speed; and adjusting the control current input to the proportional control valve group based on the comparison result to adjust the speed of the cooling motor.

[0022] In the above technical solution, the hydraulic cooling control system includes a cooling motor, an oil supply circuit, a proportional control valve assembly, a temperature sensor, and a controller. The cooling motor drives the cooling fan to rotate, thus cooling the area to be cooled. The oil supply circuit provides high-pressure hydraulic oil to the cooling motor to drive its rotation. The proportional control valve assembly is located on the oil supply circuit and can adjust the hydraulic oil input flow to the cooling motor. The temperature sensor detects the current temperature of the area to be cooled. The controller communicates with the temperature sensor and can acquire the current temperature detected by the sensor. The controller can determine the cooling requirement of the area to be cooled based on the current temperature and adjust the control current input to the proportional control valve assembly according to the cooling requirement, thereby adjusting the speed of the cooling motor to match the cooling requirement with the cooling speed. Using the above hydraulic cooling control system, the speed of the cooling motor can be precisely controlled according to the cooling requirement, thereby improving the cooling effect and avoiding the problem of inaccurate speed control of the cooling motor caused by changes in the speed of the hydraulic pump.

[0023] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. Those skilled in the art can obtain other drawings based on the structures shown in these drawings without any inventive effort. In the drawings:

[0025] Figure 1 is a schematic diagram of the hydraulic cooling control system provided according to the first embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the hydraulic cooling control system provided according to the second embodiment of the present invention;

[0027] Figure 3 is a flowchart of a hydraulic cooling method provided according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures

[0029] 1. Cooling motor

[0030] 2. Fuel supply circuit

[0031] 31 Electro-proportional throttle valve

[0032] 32 First pilot relief valve

[0033] 33 Damping valve

[0034] 34 Electro-proportional pilot-operated relief valve

[0035] 4. Hydraulic oil tank

[0036] 5. Hydraulic pump

[0037] 6 Second pilot relief valve

[0038] 7. Switch valve

[0039] 8. Overflow valve

[0040] 9. Diverter valve

[0041] 10 Throttling Damping

[0042] 11. Oil replenishment check valve

[0043] 12 Return oil circuit

[0044] 13 Oil Inlet Circuit

[0045] 14. Rotational speed detection component

[0046] 15 Second throttling damper Detailed Implementation

[0047] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0048] The hydraulic cooling control system, method, and working machinery according to the present invention are described below with reference to the accompanying drawings.

[0049] Figure 1 shows a schematic diagram of the hydraulic cooling control system provided according to the first embodiment of the present invention. The hydraulic cooling control system includes:

[0050] Cooling motor 1;

[0051] Oil supply line 2 is used to supply high-pressure hydraulic oil to the cooling motor 1;

[0052] The proportional control valve assembly is located on the oil supply line 2 and is used to adjust the hydraulic oil input flow of the cooling motor 1.

[0053] A temperature sensor (not shown in the figure) is used to obtain the current temperature of the area to be cooled corresponding to the cooling motor 1;

[0054] The controller (not shown in the figure) is communicatively connected to both the proportional control valve group and the temperature sensor and is configured to: determine the heat dissipation requirements of the area to be cooled based on the current temperature; and adjust the control current input to the proportional control valve group according to the heat dissipation requirements to adjust the speed of the cooling motor 1.

[0055] The hydraulic cooling control system provided in this embodiment of the invention includes: a cooling motor 1, an oil supply circuit 2, a proportional control valve assembly, a temperature detection element, and a controller. The cooling motor 1 drives a water-cooled fan or an intercooler fan to rotate, dissipating heat from the area to be cooled. The oil supply circuit 2 provides high-pressure hydraulic oil to the cooling motor 1. The oil supply circuit 2 includes an inlet oil line 13. After providing high-pressure hydraulic oil to the cooling motor 1, the oil supply circuit 2 drives the cooling motor 1 to rotate. The proportional control valve assembly is installed on the oil supply circuit 2. The proportional control valve assembly can adjust the hydraulic oil input flow rate of the cooling motor 1, thereby achieving precise control of the speed of the cooling motor 1. Furthermore, the temperature detection element is used to monitor the current temperature of the area to be cooled in real time and feeds the temperature information back to the controller. Based on the received current temperature information and a preset cooling strategy or calculation formula, the controller calculates the cooling demand and adjusts the control current input to the proportional control valve assembly accordingly. In this process, the controller, as the core component, realizes intelligent perception and response to the cooling demand, as well as precise control of the speed of the cooling motor 1.

[0056] The aforementioned hydraulic cooling control system can adjust the speed of the cooling motor 1 in real time according to the cooling demand, ensuring a high degree of matching between the cooling effect and the cooling requirements. Furthermore, by precisely controlling the speed of the cooling motor 1, energy waste can be effectively reduced, noise from the cooling fan can be decreased, and the overall energy efficiency of the hydraulic cooling control system can be improved.

[0057] In one embodiment, as shown in Figure 1, the hydraulic cooling control system further includes a hydraulic oil tank 4 and a hydraulic pump 5. The hydraulic pump 5 is located on the oil inlet passage 13 between the hydraulic oil tank 4 and the proportional control valve group. The proportional control valve group includes: a throttling element, whose two ends are respectively connected to the oil outlet of the hydraulic pump 5 and the oil inlet of the cooling motor 1, and is used to throttle the hydraulic oil input to the cooling motor 1; a proportional control element, which is communicatively connected to the controller and is used to adjust the hydraulic oil flow rate through the throttling element according to the control current input by the controller; and a pressure control element, which is used to limit the hydraulic oil pressure difference across the throttling element. Specifically, the throttling element can throttle the hydraulic oil entering the cooling motor 1, thereby limiting the hydraulic oil flow rate. The proportional control element dynamically adjusts the throttling degree of the throttling element according to the control current input by the controller, thereby achieving precise control of the speed of the cooling motor 1. At the same time, the pressure control element can limit the hydraulic oil pressure difference across the throttling element, ensuring the stable operation of the hydraulic cooling control system. By using the aforementioned proportional control valve group, the speed of the cooling motor 1 can be precisely adjusted according to the controller's instructions, further improving the accuracy and energy efficiency of heat dissipation control.

[0058] In the first embodiment, as shown in Figure 1, the throttling element and the proportional control element are integrated into an electro-proportional throttle valve 31, and the pressure control element is a first pilot relief valve 32. The electro-proportional throttle valve 31 is communicatively connected to the controller. The oil inlet of the electro-proportional throttle valve 31 is connected to the oil outlet of the hydraulic pump 5, and the oil outlet of the electro-proportional throttle valve 31 is connected to the oil inlet of the cooling motor 1. The controller is used to adjust the control current input to the electro-proportional throttle valve 31 according to the cooling requirements. The oil inlet and pilot port of the first pilot relief valve 32 are connected to the oil inlet and oil outlet of the electro-proportional throttle valve 31, respectively, and the oil outlet of the first pilot relief valve 32 is connected to the hydraulic oil tank 4. The hydraulic pump 5 can deliver the hydraulic oil in the hydraulic oil tank 4 to the cooling motor 1 to drive the cooling motor 1 to rotate. The hydraulic oil tank 4 can provide sufficient hydraulic oil reserves for the hydraulic pump 5. The electro-proportional throttle valve 31 can precisely adjust the flow rate of the hydraulic oil passing through it according to the instructions of the controller, thereby achieving fine control of the speed of the cooling motor 1. When the cooling demand increases, the controller increases the control current input to the electro-proportional throttle valve 31, increasing the valve opening and thus increasing the hydraulic oil flow to the cooling motor 1, thereby increasing the motor's speed to meet the higher cooling requirements. When the cooling demand decreases, the controller decreases the control current input to the electro-proportional throttle valve 31, decreasing the valve opening and reducing the hydraulic oil flow to the cooling motor 1, thus reducing its speed to avoid unnecessary energy waste. The first pilot relief valve 32, when the pressure difference across the electro-proportional throttle valve 31 exceeds a preset value, returns excess hydraulic oil to the hydraulic oil tank 4 through its outlet, ensuring a stable output flow of the electro-proportional throttle valve 31. In this scheme, a constant pressure differential flow valve, which is composed of an electro-proportional throttle valve 31 and a first pilot relief valve 32, is set at the oil inlet of the cooling motor 1. The speed of the cooling motor is adjusted by directly adjusting the oil flow of the cooling motor 1. Even if the speed of the hydraulic pump 5 changes, the excess flow will overflow through the first pilot relief valve 32, making the speed control of the cooling motor 1 more precise.

[0059] Specifically, the first pilot relief valve 32 can control the pressure difference between the inlet and outlet of the electro-proportional throttle valve 31 to maintain a preset pressure value, thereby enabling the electro-proportional throttle valve 31 to precisely regulate the flow rate of hydraulic oil. This is based on the following formula for the flow rate of a thin-walled throttle orifice:

[0060]

[0061] Where Q is the flow rate input to the cooling motor 1, α is the flow coefficient, A1 is the valve opening of the electro-proportional throttle valve 31, ΔP1 is the pressure difference between the inlet and outlet of the electro-proportional throttle valve 31, and ρ is the hydraulic oil density. With α, ρ, and ΔP1 all constant, the flow rate of the hydraulic oil input to the cooling motor 1 can be adjusted by changing the valve opening A1 of the electro-proportional throttle valve 31.

[0062] In one embodiment, a first throttling damper 10 is also connected in the oil line between the oil outlet of the electro-proportional throttle valve 31 and the pilot port of the first pilot relief valve 32. The setting of the first throttling damper 10 can reduce the pressure fluctuation of the flow into the pilot port of the first pilot relief valve 32 and prevent the hydraulic oil pressure from fluctuating frequently and causing shock.

[0063] In one embodiment, as shown in Figure 1, the hydraulic cooling control system further includes a pilot relief valve assembly. The pilot relief valve assembly is located on the connecting oil line between the oil outlet of the hydraulic pump 5 and the return oil line 12. The pilot relief valve assembly is communicatively connected to the controller. The controller is further configured to: adjust the relief pressure of the pilot relief valve assembly to a preset pressure value when the cooling demand is determined to be greater than zero; and adjust the relief pressure of the pilot relief valve assembly to zero when the cooling demand is determined to be zero, so as to connect the oil outlet of the hydraulic pump 5 and the return oil line 12.

[0064] When the engine runs at high speed, the speed of the hydraulic pump 5 increases, resulting in excessively high flow rate from the hydraulic pump 5 to the cooling motor 1, and increased hydraulic pressure in the oil supply circuit 2. Therefore, to protect the hydraulic components of the hydraulic cooling control system, this embodiment of the invention includes a pilot relief valve assembly on the connecting oil line between the outlet of the hydraulic pump 5 and the return oil line 12, controlled by a controller. The return oil line 12 is the oil line through which hydraulic oil from the hydraulic components flows into the hydraulic oil tank 4. Specifically, when the controller determines that the cooling demand is greater than zero, the relief pressure of the pilot relief valve assembly can be set to a preset pressure value to protect the hydraulic components of the hydraulic cooling control system; when the controller determines that the cooling demand is zero, the relief pressure of the pilot relief valve assembly can be set to zero to unload the high-pressure hydraulic oil delivered by the hydraulic pump 5. By using the aforementioned pilot relief valve assembly, excessively high flow rate from the hydraulic pump 5 to the cooling motor 1 can be effectively prevented when the engine is running at high speed, thereby avoiding damage to the hydraulic components caused by excessively high hydraulic pressure in the oil supply circuit 2. When the controller determines that the heat dissipation requirement is zero, the high-pressure hydraulic oil delivered by the hydraulic pump 5 will flow directly back to the hydraulic oil tank 4 through the pilot relief valve group, thereby unloading the hydraulic pump 5 and avoiding unnecessary energy waste.

[0065] In one embodiment, as shown in Figure 1, the pilot relief valve assembly includes a second pilot relief valve 6 and a switching valve 7. The inlet and outlet of the second pilot relief valve 6 are connected to the outlet of the hydraulic pump 5 and the return oil circuit 12, respectively. The two ends of the switching valve 7 are connected to the pilot port of the second pilot relief valve 6 and the return oil circuit 12, respectively. The switching valve 7 is communicatively connected to a controller, which controls the opening or closing of the switching valve 7. When the switching valve 7 is open, it adjusts the relief pressure to zero; when the switching valve 7 is closed, it adjusts the relief pressure to a preset pressure value. When the switching valve 7 is open, the hydraulic oil in the return oil circuit 12 enters the pilot port of the second pilot relief valve 6 through the switching valve 7. The hydraulic oil entering the pilot port can open the inlet and outlet of the second pilot relief valve 6, allowing the high-pressure hydraulic oil delivered from the hydraulic pump 5 to flow directly from the second pilot relief valve 6 into the return oil circuit 12, thereby unloading the hydraulic oil. When the switching valve 7 is open, the second pilot relief valve 6 limits the pressure difference between the outlet of the hydraulic pump 5 and the return oil circuit 12 to protect the hydraulic components within the hydraulic cooling control system. In one specific embodiment, the switching valve 7 is a two-position normally open solenoid valve.

[0066] In the second embodiment, as shown in Figure 2, is a schematic diagram of the hydraulic cooling control system provided according to the second embodiment of the present invention. The throttling element is a damping valve 33, and the proportional control element and pressure control element are integrated into an electro-proportional pilot relief valve 34. The electro-proportional pilot relief valve 34 is communicatively connected to the controller. The inlet and pilot port of the electro-proportional pilot relief valve 34 are respectively connected to the inlet and outlet of the damping valve 33, and the outlet of the electro-proportional pilot relief valve 34 is connected to the hydraulic oil tank 4. The damping valve 33 here functions as a fixed throttling orifice, and the flow area of ​​the damping valve 33 is a fixed value. The damping valve 33 can prevent shock to the cooling motor 1 caused by sudden changes in hydraulic oil pressure. The electro-proportional pilot relief valve 34 can adjust its overflow pressure according to the controller's instructions, thereby achieving accurate control of the pressure difference across the damping valve 33, and thus controlling the flow rate through the damping valve 33. When the cooling demand increases, the controller increases the control current input to the electro-proportional pilot relief valve 34, increasing its relief pressure. This increases the pressure difference across the damping valve 33, allowing more hydraulic oil to flow to the cooling motor 1 and increasing its speed. Conversely, when the cooling demand decreases, the controller decreases the control current input to the electro-proportional pilot relief valve 34, reducing its relief pressure. This decreases the pressure difference across the damping valve 33, reducing the flow of hydraulic oil to the cooling motor 1 and lowering its speed. By using the damping valve 33 and the electro-proportional pilot relief valve 34 in the cooling motor's oil inlet circuit to form a variable pressure differential fixed throttle orifice regulating valve, accurate control of the cooling motor's oil inlet flow can be achieved, thereby precisely regulating the cooling motor 1's speed to meet different cooling demands. Furthermore, this solution is unaffected by changes in engine speed. It should be noted that the electro-proportional throttle valve 31 is a valve component capable of adjusting the valve opening according to the control current, thereby precisely controlling the hydraulic oil flow. The damping valve 33 is a valve that can limit the flow of hydraulic oil, and its valve opening is a fixed value.

[0067] In one specific embodiment, a second throttling damper 15 is also connected in the oil line between the oil outlet of the damping valve 33 and the pilot port of the electro-proportional pilot relief valve 34. The setting of the second throttling damper 15 can reduce the pressure fluctuation of the flow into the pilot port of the pilot relief valve 34 and prevent the electro-proportional pilot relief valve 34 from overflowing abnormally due to frequent fluctuations in hydraulic oil pressure.

[0068] Specifically, the throttling area of ​​the damping valve 33 is a constant value. The electro-proportional pilot relief valve 34 can adjust the hydraulic oil pressure difference between the inlet and outlet ends of the damping valve 33, thereby precisely regulating the hydraulic oil flow rate. This is based on the following formula for the flow rate of a thin-walled throttling orifice:

[0069]

[0070] Where Q is the flow rate input to the cooling motor 1, α is the flow coefficient, A2 is the valve opening of the damping valve 33, ΔP2 is the hydraulic oil pressure difference between the inlet and outlet of the damping valve 33, and ρ is the hydraulic oil density. With α, ρ, and A2 all constant, the flow rate of the hydraulic oil input to the cooling motor 1 can be adjusted by adjusting the set pressure of the electro-proportional pilot relief valve 34.

[0071] In one embodiment, as shown in Figure 2, the hydraulic cooling control system further includes a relief valve 8, with its two ends connected to the hydraulic pump 5 and the return oil circuit 12, respectively. The relief valve 8 can limit the pressure difference between the outlet of the hydraulic pump 5 and the return oil circuit 12. When the pressure difference is too large, the relief valve 8 opens, reducing the pressure value at the outlet of the hydraulic pump 5 to protect the hydraulic components in the hydraulic cooling control system.

[0072] In one embodiment, the controller is further configured to adjust the overflow pressure of the electro-proportional pilot relief valve 34 to zero when the heat dissipation requirement is determined to be zero. When it is necessary to unload the hydraulic oil delivered by the hydraulic pump 5, the controller controls the overflow pressure of the electro-proportional pilot relief valve 34 to zero, and the high-pressure hydraulic oil output from the hydraulic pump 5 will overflow directly from the position of the electro-proportional pilot relief valve 34 to the return oil line 12, and further flow to the hydraulic oil tank 4, completing the unloading of the hydraulic oil.

[0073] In one embodiment, the hydraulic cooling control system further includes a speed detection element 14 for detecting the speed of the cooling motor 1. The controller is further configured to: determine the required cooling speed of the cooling motor 1 based on cooling demand; determine the current speed of the cooling motor 1 based on the detection signal emitted by the speed detection element 14; compare the current speed with the required cooling speed; and adjust the control current based on the comparison result. The controller can adjust the control current based on the comparison result to further precisely control the speed of the cooling motor 1. When the current speed is lower than the required cooling speed, the controller increases the control current input to the electro-proportional throttle valve 31 or the electro-proportional pilot relief valve 34 to increase the speed of the cooling motor 1; while when the current speed is higher than the required cooling speed, the controller decreases the control current to reduce the speed of the cooling motor 1. In this way, closed-loop control of the speed of the cooling motor 1 can be achieved, ensuring that the cooling motor 1 always operates in the optimal cooling state.

[0074] In one embodiment, as shown in Figure 2, there are multiple cooling motors 1 and multiple proportional control valve groups, each corresponding to one of the multiple cooling motors 1. The hydraulic cooling control system also includes a flow divider valve 9, which has an inlet end connected to the outlet end of the hydraulic pump 5 and multiple outlet ends connected to the inlets of the multiple proportional control valve groups. The multiple outlet ends can distribute hydraulic oil to the multiple proportional control valve groups according to a preset flow ratio. The multiple cooling motors 1 may include intercooled motors and water-cooled motors. The flow divider valve 9 can distribute hydraulic oil to each outlet end according to a preset ratio, ensuring that each cooling motor 1 receives an appropriate amount of hydraulic oil, thereby achieving independent and precise cooling control for multiple cooling areas. This structure is particularly suitable for large engineering machinery or complex hydraulic cooling control systems, where it is necessary to simultaneously control the speed of multiple water-cooled fans or intercooled fans to meet the cooling needs of different areas. By setting the flow divider valve 9, the layout of hydraulic pipelines can be simplified, the system integration and reliability can be improved, and the complexity of maintenance and operation can be reduced. Furthermore, the flow divider valve 9 allows multiple cooling motors 1 to be supplied with oil through the same hydraulic pump 5, reducing the required layout space and the number of hydraulic lines. The purpose of the flow divider valve 9 is to proportionally distribute the flow and, secondly, to eliminate the impact of pressure differences caused by different speeds of the two cooling motors 1 on the main oil circuit flow distribution. Specifically, when there are two cooling motors 1, the flow divider valve 9 has one inlet and two outlets. When there are more than two cooling motors 1, the flow divider valve 9 is an integrated flow divider valve 9 formed by multiple flow divider components connected in series, and the number of outlets of the integrated flow divider valve 9 is the same as the number of throttling elements.

[0075] In one specific embodiment, there are multiple cooling motors 1 and one proportional control valve group. The oil inlet passage 13 passes through the proportional control valve group and the oil inlet of multiple cooling motors 1 in sequence to drive multiple cooling motors 1 to rotate at the same speed.

[0076] In one embodiment, as shown in FIG2, the hydraulic cooling control system further includes a replenishing check valve 11. The replenishing check valve 11 is disposed on the connecting oil line between the oil inlet end of the cooling motor 1 and the oil return line 12, and the flow direction of the replenishing check valve 11 is from the oil return line 12 to the oil inlet end of the cooling motor 1. When the hydraulic oil is unloaded, the hydraulic oil on the oil return line 12 can flow back into the oil inlet end of the cooling motor 1 through the replenishing check valve 11 to prevent the formation of cavities.

[0077] In one embodiment, a working machine is provided, including the aforementioned hydraulic cooling control system.

[0078] In one embodiment, a hydraulic cooling control method is provided, applied in the aforementioned hydraulic cooling control system. The hydraulic cooling control method includes: determining the cooling demand of the area to be cooled based on the current temperature; and adjusting the control current input to the proportional control valve group according to the cooling demand to adjust the speed of the cooling motor 1. The hydraulic cooling control method of this application can control the hydraulic oil flow rate input to the cooling motor 1 based on a comparison between the current speed and the required speed of the cooling motor 1. In this control process, it mainly relies on the coordinated actions of various components of the hydraulic control system. When adjusting the speed of the cooling motor 1 using this control method, proportional speed adjustment can be achieved. Further, the hydraulic cooling control system also includes a speed detection element 14 for detecting the speed of the cooling motor 1. The cooling control method further includes: determining the cooling speed of the cooling motor 1 based on the cooling demand; determining the current speed of the cooling motor 1 based on the detection signal emitted by the speed detection element 14; comparing the current speed and the cooling speed; and adjusting the control current based on the comparison result.

[0079] In a specific embodiment, as shown in Figure 3, is a flowchart of a hydraulic cooling method provided according to an embodiment of the present invention. This hydraulic cooling method is applied in the hydraulic cooling control system shown in Figure 1. Multiple cooling motors 1 include water-cooled motors and intercooled motors. The water-cooled motors drive a water-cooled fan to rotate, and the intercooled motors drive an intercooled fan to rotate. The switching valve 7 is a normally open solenoid directional valve. After the engine starts, a temperature detection device detects the engine intake air temperature and the engine coolant temperature, and then determines whether the engine intake air temperature and engine coolant temperature have reached the cooling temperature. If neither the engine intake air temperature nor the coolant temperature has reached the cooling temperature, the normally open solenoid directional valve is de-energized, allowing hydraulic oil to overflow from the second pilot relief valve 6, and controlling the current of the corresponding electro-proportional throttle valve 31 to zero, so that neither the intercooled motor nor the water-cooled motor rotates. When either the engine intake air temperature or the engine coolant temperature exceeds the corresponding cooling temperature, the normally open solenoid directional valve is energized, controlling the corresponding electro-proportional throttle valve 31 to open, so that either the intercooled motor or the water-cooled motor operates. The current speed of the intercooled or water-cooled motor is detected by a speed sensor to determine whether it meets the set speed corresponding to the heat dissipation requirements. If the current speed exceeds the set speed, the current input to the corresponding electro-proportional throttle valve 31 is increased; if the current speed is lower than the set speed, the current input to the corresponding electro-proportional throttle valve 31 is decreased. In this way, the hydraulic cooling control system can automatically adjust the speed of the cooling motor 1 according to the actual heat dissipation requirements, ensuring the cooling effect while also achieving rational energy utilization. In addition, this hydraulic cooling control system has the advantages of simple structure, easy maintenance, and high reliability, making it particularly suitable for large-scale engineering machinery or complex hydraulic cooling control systems, providing strong support for the normal operation of engineering machinery.

[0080] In one embodiment, there are multiple cooling motors 1 and multiple proportional control valve assemblies, each corresponding to one of the multiple cooling motors 1. The hydraulic cooling control system also includes a flow divider valve 9, which is an integrated flow divider valve. This integrated flow divider valve has an inlet end connected to the outlet end of the hydraulic pump 5 and multiple outlet ends connected to the inlets of the multiple proportional control valve assemblies. The integrated flow divider valve can adjust the hydraulic oil flow ratio input to each proportional control valve according to the received flow divider command. The hydraulic cooling control method also includes: determining the cooling requirements of each area to be cooled; and outputting a flow divider command according to the cooling requirements, so that the integrated flow divider valve divides the hydraulic oil according to the ratio corresponding to the flow divider command. This flow divider command can be determined based on the cooling requirements and a preset flow ratio relationship, ensuring that each cooling motor 1 can obtain an appropriate flow of hydraulic oil to achieve precise and independent cooling control. In this way, the hydraulic cooling control system can intelligently adjust the distribution of hydraulic oil according to the actual needs of different cooling areas, improving cooling efficiency while reducing energy consumption.

[0081] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0082] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic cooling control system, characterized in that, The hydraulic cooling control system includes: a cooling motor (1); an oil supply line (2) for supplying high-pressure hydraulic oil to the cooling motor (1); a hydraulic oil tank (4) and a hydraulic pump (5), the hydraulic pump (5) being located on the oil inlet line (13) between the hydraulic oil tank (4) and the proportional control valve group; a proportional control valve group, the proportional control valve group being located on the oil supply line (2), the proportional control valve group being used to adjust the hydraulic oil input flow rate of the cooling motor (1); a temperature sensor for obtaining the current temperature of the area to be cooled corresponding to the cooling motor (1); and a controller, which is communicatively connected to both the proportional control valve group and the temperature sensor and is configured to: determine the cooling demand of the area to be cooled based on the current temperature; and adjust the control current input to the proportional control valve group based on the cooling demand to adjust the rotational speed of the cooling motor (1). The proportional control valve group includes: a throttling element, whose two ends are respectively connected to the oil outlet of the hydraulic pump (5) and the oil inlet of the cooling motor (1) and used to throttle the hydraulic oil input to the cooling motor (1); a proportional control element, which is communicatively connected to the controller and is used to adjust the hydraulic oil flow rate through the throttling element according to the control current input by the controller; a pressure control element, which is used to limit the hydraulic oil pressure difference between the two ends of the throttling element; the throttling element is a damping valve (33); the proportional control element and the pressure control element are integrated into an electro-proportional pilot relief valve (34); the oil inlet and pilot port of the electro-proportional pilot relief valve (34) are respectively connected to the oil inlet and oil outlet of the damping valve (33); and the oil outlet of the electro-proportional pilot relief valve (34) is connected to the hydraulic oil tank (4).

2. The hydraulic cooling control system according to claim 1, characterized in that, The hydraulic cooling control system further includes an overflow valve (8), the two ends of which are connected to the hydraulic pump (5) and the return oil circuit (12), respectively.

3. The hydraulic cooling control system according to claim 1, characterized in that, The controller is also configured to adjust the overflow pressure of the electro-proportional pilot overflow valve (34) to zero when the heat dissipation requirement is determined to be zero.

4. The hydraulic cooling control system according to any one of claims 1 to 3, characterized in that, The hydraulic cooling control system further includes a speed detection element (14) for detecting the speed of the cooling motor (1), and the controller is further configured to: determine the cooling demand speed of the cooling motor (1) according to the cooling demand; determine the current speed of the cooling motor (1) according to the detection signal emitted by the speed detection element (14); compare the current speed with the cooling demand speed; and adjust the control current according to the comparison result.

5. The hydraulic cooling control system according to any one of claims 1 to 3, characterized in that, The number of cooling motors (1) and proportional control valve groups are both multiple. Each of the multiple proportional control valve groups is connected to a corresponding cooling motor (1). The hydraulic cooling control system also includes a flow divider valve (9). The flow divider valve (9) includes an inlet end connected to the outlet end of the hydraulic pump (5) and multiple outlet ends connected to the inlet ends of the multiple proportional control valve groups. The multiple outlet ends can deliver hydraulic oil to the multiple proportional control valve groups according to a preset flow ratio.

6. A type of operating machinery, characterized in that, Includes a hydraulic cooling control system according to any one of claims 1 to 5.

7. A hydraulic cooling control method, characterized in that, In the hydraulic cooling control system applied to any one of claims 1 to 5, the hydraulic cooling control system further includes a speed detection element (14) for detecting the speed of the cooling motor (1), and the hydraulic cooling control method includes: determining the cooling demand of the area to be cooled based on the current temperature; determining the cooling speed of the cooling motor (1) based on the cooling demand; determining the current speed of the cooling motor (1) based on the detection signal emitted by the speed detection element (14); comparing the current speed and the cooling speed; and adjusting the control current input to the proportional control valve group based on the comparison result to adjust the speed of the cooling motor (1).

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