Hydraulic system and oil temperature control method

Abstract

The invention discloses a hydraulic system and an oil temperature control method, and relates to the technical field of hydraulic pressure. The hydraulic system comprises a hydraulic oil tank, a first oil way, a second oil way, a confluence mechanism, an execution mechanism and a control mechanism. The hydraulic oil tank is provided with a first temperature detection piece. The first oil way comprises a first main pump, a first main valve, a first radiator, a second temperature detection piece and a third temperature detection piece. The second oil way comprises a second main pump, a second main valve, a second radiator, a fourth temperature detection piece and a fifth temperature detection piece. According to the hydraulic system, under the condition that the temperature in the hydraulic oil tank is in a normal state, the rotating speed of the first radiator is adjusted according to the temperature of the oil outlet of the first oil way, and the rotating speed of the second radiator is adjusted according to the temperature of the oil outlet of the second oil way; and the problem of energy waste under the condition that the oil temperatures of the two oil ways are different in the unified adjustment process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulics, and more specifically, to a hydraulic system. In addition, the present invention also relates to an oil temperature control method applied to the above hydraulic system. Background Art

[0002] For the solution of using dual engines in excavators, it is necessary to configure two sets of heat dissipation systems to cool the hydraulic oil in two circuits respectively, and thus more energy is required to drive the radiators to work. In addition, during the actual heat dissipation process, in the first case, when the oil temperatures in the two circuits are different and the two radiator fans simply operate at the same speed, it may cause a situation where the rotational speed of the radiator in the circuit with a lower oil temperature is redundant; in the second case, when the oil temperatures in both circuits are relatively high and both radiators operate at the maximum speed, the cooling speeds of the two circuits may not be the same, which may cause the phenomenon that the radiator fan still operates at a high speed after the oil temperature in one of the circuits has decreased. Both of these situations will result in energy waste.

[0003] In summary, how to reduce the energy waste in the heat dissipation of the hydraulic system oil circuit is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a hydraulic system that can respectively control the rotational speeds of the first radiator in the first oil circuit and the second radiator in the second oil circuit, and avoid the problem of energy waste in the case of different oil temperatures in the two oil circuits.

[0005] Another object of the present invention is to provide an oil temperature control method applied to the above hydraulic system.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A hydraulic system, comprising: A hydraulic oil tank for providing hydraulic oil for a first oil circuit and a second oil circuit, and a first temperature detection component is provided on the hydraulic oil tank; The first oil circuit includes a first main pump, a first main valve, a first radiator, a second temperature detection component arranged at the oil inlet of the first radiator, and a third temperature detection component arranged at the oil outlet of the first radiator; The second oil circuit includes a second main pump, a second main valve, a second radiator, a fourth temperature detection component arranged at the oil inlet of the second radiator, and a fifth temperature detection component arranged at the oil outlet of the second radiator; A confluence mechanism, both the first main valve and the second main valve are connected to the confluence mechanism; An actuator, connected to the confluence mechanism; A control mechanism, the first temperature detector, the second temperature detector, the third temperature detector, the fourth temperature detector, the fifth temperature detector, the first radiator, and the second radiator are all connected to the control mechanism, and the control mechanism is configured to adjust the rotation speeds of the first radiator and the second radiator according to the temperature information detected by the first temperature detector, the second temperature detector, the third temperature detector, the fourth temperature detector, and the fifth temperature detector.

[0007] Optionally, a third oil circuit is further included. The first end of the third oil circuit is connected to the first oil circuit, and the second end of the third oil circuit is connected to the second oil circuit; A communication control valve is provided in the third oil circuit, and the communication control valve is configured to control the communication or disconnection between the first oil circuit and the second oil circuit.

[0008] Optionally, the first oil circuit includes a first backpressure valve and a second backpressure valve. One end of the first backpressure valve is connected to the oil inlet of the first radiator, the other end of the first backpressure valve is connected to the first main valve, one end of the second backpressure valve is connected to the first main valve, and the other end of the second backpressure valve is connected to the hydraulic oil tank. The set pressure of the first backpressure valve is less than the set pressure of the second backpressure valve; The second oil circuit includes a third backpressure valve and a fourth backpressure valve. One end of the third backpressure valve is connected to the oil inlet of the second radiator, the other end of the third backpressure valve is connected to the second main valve, one end of the fourth backpressure valve is connected to the second main valve, and the other end of the fourth backpressure valve is connected to the hydraulic oil tank. And the set pressure of the third backpressure valve is less than the set pressure of the fourth backpressure valve.

[0009] An oil temperature control method is applied to the hydraulic system described in any one of the above. The oil temperature control method includes: Obtain the first temperature information detected by the first temperature detector, the second temperature information detected by the second temperature detector, the third temperature information detected by the third temperature detector, the fourth temperature information detected by the fourth temperature detector, and the fifth temperature information detected by the fifth temperature detector; Judge whether at least one of the second temperature information and the third temperature information is lower than the first temperature information. If so, control the rotation speed of the first radiator according to the first temperature information; if not, proceed to the next step; Control the rotation speed of the first radiator according to the third temperature information; Judge whether at least one of the fourth temperature information and the fifth temperature information is lower than the first temperature information. If so, control the rotation speed of the second radiator according to the first temperature information; if not, proceed to the next step; Control the rotation speed of the second radiator according to the fifth temperature information.

[0010] Optionally, the controlling the rotation speed of the first radiator according to the first temperature information includes: Obtain the corresponding first gear information according to the first temperature information; Control the first radiator to adjust to the corresponding gear according to the first gear information; The controlling the rotation speed of the first radiator according to the third temperature information includes: Obtain the corresponding second gear information according to the third temperature information; Control the first radiator to adjust to the corresponding gear according to the second gear information; The controlling the rotation speed of the second radiator according to the first temperature information includes: Obtain the corresponding third gear information according to the first temperature information; Control the second radiator to adjust to the corresponding gear according to the third gear information; The controlling the rotation speed of the second radiator according to the fifth temperature information includes: Obtain the corresponding fourth gear information according to the fifth temperature information; Control the second radiator to adjust to the corresponding gear according to the fourth gear information.

[0011] Optionally, the controlling the rotation speed of the first radiator according to the first temperature information includes: Obtain the corresponding first rotation speed information according to the first temperature information and the temperature-rotation speed curve graph; the temperature-rotation speed curve graph is a curve schematic diagram of temperature and rotation speed, and the slope of the temperature-rotation speed curve graph gradually increases during the process of the temperature increasing from low to high in the temperature-rotation speed curve graph; Control the first radiator to rotate according to the first rotation speed information; The controlling the rotation speed of the first radiator according to the third temperature information includes: Obtain the corresponding second rotation speed information according to the third temperature information and the temperature-rotation speed curve graph; Control the first radiator to rotate according to the second rotation speed information; The controlling the rotation speed of the second radiator according to the first temperature information includes: Obtain the corresponding third rotation speed information according to the first temperature information and the temperature-rotation speed curve graph; Control the rotation of the second radiator according to the third rotational speed information; The controlling the rotational speed of the second radiator according to the fifth temperature information includes: Obtain the corresponding fourth rotational speed information of the fifth temperature information according to the fifth temperature information and the temperature-rotational speed curve graph; Control the rotation of the second radiator according to the fourth rotational speed information.

[0012] Optionally, the controlling the rotational speed of the first radiator according to the first temperature information includes: Obtain the corresponding fifth rotational speed information of the first temperature information according to the first temperature information and the temperature-rotational speed straight-line graph; the temperature-rotational speed straight-line graph is a schematic curve graph of temperature and rotational speed, and the slope of temperature and rotational speed in the temperature-rotational speed curve graph is a fixed value; Control the rotation of the first radiator according to the fifth rotational speed information; The controlling the rotational speed of the first radiator according to the third temperature information includes: Obtain the corresponding sixth rotational speed information of the third temperature information according to the third temperature information and the temperature-rotational speed straight-line graph; Control the rotation of the first radiator according to the sixth rotational speed information; The controlling the rotational speed of the second radiator according to the first temperature information includes: Obtain the corresponding seventh rotational speed information of the first temperature information according to the first temperature information and the temperature-rotational speed straight-line graph; Control the rotation of the second radiator according to the seventh rotational speed information; The controlling the rotational speed of the second radiator according to the fifth temperature information includes: Obtain the corresponding eighth rotational speed information of the fifth temperature information according to the fifth temperature information and the temperature-rotational speed straight-line graph; Control the rotation of the second radiator according to the eighth rotational speed information.

[0013] Optionally, before obtaining the first temperature information detected by the first temperature detection component, the second temperature information detected by the second temperature detection component, the third temperature information detected by the third temperature detection component, the fourth temperature information detected by the fourth temperature detection component, and the fifth temperature information detected by the fifth temperature detection component, it includes: Determine whether it is the startup stage of the hydraulic system. If so, control both the first radiator and the second radiator to stop rotating. If not, enter the step of obtaining the first temperature information detected by the first temperature detector, the second temperature information detected by the second temperature detector, the third temperature information detected by the third temperature detector, the fourth temperature information detected by the fourth temperature detector, and the fifth temperature information detected by the fifth temperature detector.

[0014] Optionally, the hydraulic system further includes a third oil circuit. The first end of the third oil circuit is connected to the first oil circuit, and the second end of the third oil circuit is connected to the second oil circuit. A connection control valve is provided in the third oil circuit, and the connection control valve is used to control the connection or disconnection between the first oil circuit and the second oil circuit. After obtaining the first temperature information detected by the first temperature detector, the second temperature information detected by the second temperature detector, the third temperature information detected by the third temperature detector, the fourth temperature information detected by the fourth temperature detector, and the fifth temperature information detected by the fifth temperature detector, before determining whether at least one of the second temperature information and the third temperature information is lower than the first temperature information, it includes: Determine whether one of the third temperature information and the fifth temperature information is higher than a preset maximum temperature value and the other is lower than the preset maximum temperature value. If so, control the connection control valve to open to connect the first oil circuit and the second oil circuit. If not, control the connection control valve to close to disconnect the first oil circuit and the second oil circuit.

[0015] Optionally, the hydraulic system further includes a first warning mechanism and a second warning mechanism. Both the first warning mechanism and the second warning mechanism are connected to the control mechanism. After obtaining the first temperature information detected by the first temperature detector, the second temperature information detected by the second temperature detector, the third temperature information detected by the third temperature detector, the fourth temperature information detected by the fourth temperature detector, and the fifth temperature information detected by the fifth temperature detector, before determining whether at least one of the second temperature information and the third temperature information is lower than the first temperature information, it includes: Determine whether the second temperature information is lower than the third temperature information. If so, control the first warning mechanism to send a warning message. Determine whether the fourth temperature information is lower than the fifth temperature information. If so, control the second warning mechanism to send a warning message.

[0016] The hydraulic system provided by the present invention includes a hydraulic oil tank, a first oil circuit, a second oil circuit, a confluence mechanism, an actuator, and a control mechanism. Among them, the hydraulic oil tank is used to provide hydraulic oil for the first oil circuit and the second oil circuit, and the hydraulic oil tank is provided with a first temperature detector; the first oil circuit includes a first main pump, a first main valve, a first radiator, a second temperature detector arranged at the oil inlet of the first radiator, and a third temperature detector arranged at the oil outlet of the first radiator; the second oil circuit includes a second main pump, a second main valve, a second radiator, a fourth temperature detector arranged at the oil inlet of the second radiator, and a fifth temperature detector arranged at the oil outlet of the second radiator; both the first main valve and the second main valve are connected to the confluence mechanism; the actuator is connected to the confluence mechanism; the first temperature detector, the second temperature detector, the third temperature detector, the fourth temperature detector, the fifth temperature detector, the first radiator, and the second radiator are all connected to the control mechanism, and the control mechanism is used to adjust the rotation speeds of the first radiator and the second radiator according to the temperature information detected by the first temperature detector, the second temperature detector, the third temperature detector, the fourth temperature detector, and the fifth temperature detector.

[0017] It should be noted that the first oil circuit in this application can be one oil circuit or at least two identical oil circuits, and the second oil circuit can be one oil circuit or at least two identical oil circuits. During actual use, when at least one of the first oil circuit and the second oil circuit is at least two identical oil circuits, the control mechanism 16 needs to adjust the rotation speed of the radiator in the corresponding oil circuit according to the data of the relevant temperature detectors in at least three oil circuits. Therefore, the hydraulic system in this application can not only be a dual-engine dual-pump dual-valve hydraulic system, but also a multi-engine multi-pump multi-valve hydraulic system.

[0018] During actual use, two oil suction ports are arranged below the hydraulic oil tank, and the two oil suction ports are respectively connected to the first main pump and the second main pump. The first engine is connected to the first main pump through a coupling, and the second engine is connected to the second main pump through a coupling. When the first engine starts, it drives the first main pump to suck oil from the hydraulic oil tank, and the first main pump extracts the hydraulic oil to the first main valve; when the second engine starts, it drives the second main pump to suck oil from the hydraulic oil tank, and the second main pump extracts the hydraulic oil to the second main valve; the hydraulic oil in the first main valve and the second main valve is confluenced through the confluence mechanism, and the confluenced hydraulic oil flows to the actuator to perform actions. After the actions are completed, the hydraulic oil with increased temperature flows back to the confluence mechanism and then flows back to the first main valve and the second main valve through the confluence mechanism. The hydraulic oil flowing back to the first main valve enters the first radiator for cooling, and the cooled hydraulic oil flows back to the hydraulic oil tank; the hydraulic oil flowing back to the second main valve enters the second radiator for cooling, and the cooled hydraulic oil flows back to the hydraulic oil tank.

[0019] In the above process, the first temperature detector obtains the first temperature information of the hydraulic oil tank in real time, the second temperature detector obtains the second temperature information of the oil inlet of the first radiator in real time, and the third temperature detector obtains the third temperature information of the oil outlet of the first radiator in real time; the fourth temperature detector obtains the second temperature information of the oil inlet of the second radiator in real time, and the fifth temperature detector obtains the third temperature information of the oil outlet of the second radiator in real time.

[0020] Regarding the adjustment of the rotation speed of the first radiator, if at least one of the second temperature information and the third temperature information is lower than the first temperature information, the rotation speed of the first radiator is controlled according to the first temperature information; if the third temperature information is higher than the first temperature information, the rotation speed of the first radiator is controlled according to the third temperature information.

[0021] Regarding the adjustment of the rotation speed of the second radiator, if at least one of the fourth temperature information and the fifth temperature information is lower than the first temperature information, the rotation speed of the second radiator is controlled according to the first temperature information; if the fifth temperature information is higher than the first temperature information, the rotation speed of the first radiator is controlled according to the fifth temperature information.

[0022] When the first temperature information detected by the first temperature detector is higher than the preset maximum temperature, or when the first temperature information detected by the first temperature detector is higher than the third temperature information and the fifth temperature information, it is necessary to give priority to considering the oil temperature of the hydraulic oil tank and adjust the rotation speeds of the first radiator and the second radiator according to the first temperature information.

[0023] In this application, when the temperature in the hydraulic oil tank is relatively high, the first radiator and the second radiator are controlled to dissipate heat according to the oil temperature in the hydraulic oil tank; when the temperature in the hydraulic oil tank is in a normal state, the rotation speed of the first radiator is adjusted according to the temperature of the oil outlet of the first oil circuit, and the rotation speed of the second radiator is adjusted according to the temperature of the oil outlet of the second oil circuit, avoiding the problem of energy waste when the oil temperatures of the two oil circuits are different during the unified adjustment process. Moreover, the oil temperature of the hydraulic oil tank is given priority to ensure that the oil temperature in the hydraulic oil tank meets the requirements.

[0024] In addition, this application also provides an oil temperature control method applied to the above hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0026] Figure 1Schematic structural diagram of the hydraulic system provided by the present invention.

[0027] Figure 2 Schematic diagram of gear shifting for the oil temperature control method provided by the present invention.

[0028] Figure 3 Schematic diagram of the temperature - rotation speed curve for the oil temperature control method provided by the present invention.

[0029] Figure 4 Schematic diagram of the temperature - rotation speed straight line for the oil temperature control method provided by the present invention.

[0030] Figure 5 Schematic flow diagram of the oil temperature control method provided by the present invention.

[0031] Figures 1-5 Where: 1 is the first engine, 2 is the first main pump, 3 is the second back - pressure valve, 4 is the first main valve, 5 is the first back - pressure valve, 6 is the first radiator, 7 is the confluence mechanism, 8 is the actuator, 9 is the hydraulic oil tank, 101 is the second temperature detector, 102 is the third temperature detector, 103 is the fourth temperature detector, 104 is the fifth temperature detector, 105 is the first temperature detector, 10 is the second engine, 11 is the second main pump, 12 is the third back - pressure valve, 13 is the second main valve, 14 is the fourth back - pressure valve, 15 is the second radiator, 16 is the control mechanism. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] The core of the present invention is to provide a hydraulic system that can respectively control the rotation speeds of the first radiator in the first oil circuit and the second radiator in the second oil circuit, avoiding the problem of energy waste when the oil temperatures of the two oil circuits are different.

[0034] It should be noted that the first oil circuit in this application can be one oil circuit or at least two identical oil circuits, and the second oil circuit can be one oil circuit or at least two identical oil circuits. In the actual use process, when at least one of the first oil circuit and the second oil circuit is at least two identical oil circuits, the control mechanism needs to adjust the rotation speed of the radiator in the corresponding oil circuit according to the data of the relevant temperature detectors in at least three oil circuits. Therefore, the hydraulic system in this application can not only be a dual - engine dual - pump dual - valve hydraulic system, but also a multi - engine multi - pump multi - valve hydraulic system.

[0035] Another core of the present invention is to provide an oil temperature control method applied to the above hydraulic system.

[0036] Please refer to Figures 1 to 5 .

[0037] The hydraulic system provided by this specific embodiment includes a hydraulic oil tank 9, a first oil circuit, a second oil circuit, a confluence mechanism 7, an actuator 8, and a control mechanism 16. Among them, the hydraulic oil tank 9 is used to provide hydraulic oil for the first oil circuit and the second oil circuit, and the hydraulic oil tank 9 is provided with a first temperature detector 105; the first oil circuit includes a first main pump 2, a first main valve 4, a first radiator 6, a second temperature detector 101 arranged at the inlet of the first radiator 6, and a third temperature detector 102 arranged at the outlet of the first radiator 6; the second oil circuit includes a second main pump 11, a second main valve 13, a second radiator 15, a fourth temperature detector 103 arranged at the inlet of the second radiator 15, and a fifth temperature detector 104 arranged at the outlet of the second radiator 15; both the first main valve 4 and the second main valve 13 are connected to the confluence mechanism 7; the actuator 8 is connected to the confluence mechanism 7; the first temperature detector 105, the second temperature detector 101, the third temperature detector 102, the fourth temperature detector 103, the fifth temperature detector 104, the first radiator 6, and the second radiator 15 are all connected to the control mechanism 16, and the control mechanism 16 is used to adjust the rotation speeds of the first radiator 6 and the second radiator 15 according to the temperature information detected by the first temperature detector 105, the second temperature detector 101, the third temperature detector 102, the fourth temperature detector 103, and the fifth temperature detector 104.

[0038] During actual use, two oil suction ports are provided below the hydraulic oil tank 9, and the two oil suction ports are respectively connected to the first main pump 2 and the second main pump 11. The first engine 1 is connected to the first main pump 2 through a coupling, and the second engine 10 is connected to the second main pump 11 through a coupling. When the first engine 1 starts, it drives the first main pump 2 to suck oil from the hydraulic oil tank 9, and the first main pump 2 extracts the hydraulic oil to the first main valve 4; when the second engine 10 starts, it drives the second main pump 11 to suck oil from the hydraulic oil tank 9, and the second main pump 11 extracts the hydraulic oil to the second main valve 13; the hydraulic oil in the first main valve 4 and the second main valve 13 is confluenced by the confluence mechanism 7, and the confluenced hydraulic oil flows to the actuator 8 to perform actions. After the actions are completed, the hydraulic oil with an increased oil temperature flows back to the confluence mechanism 7, and then flows back to the first main valve 4 and the second main valve 13 through the confluence mechanism 7. The hydraulic oil flowing back to the first main valve 4 enters the first radiator 6 for cooling, and the cooled hydraulic oil flows back to the hydraulic oil tank 9; the hydraulic oil flowing back to the second main valve 13 enters the second radiator 15 for cooling, and the cooled hydraulic oil flows back to the hydraulic oil tank 9.

[0039] During the above process, the first temperature detector 105 obtains the first temperature information of the hydraulic oil tank 9 in real time, the second temperature detector 101 obtains the second temperature information of the oil inlet of the first radiator 6 in real time, and the third temperature detector 102 obtains the third temperature information of the oil outlet of the first radiator 6 in real time; the fourth temperature detector 103 obtains the second temperature information of the oil inlet of the second radiator 15 in real time, and the fifth temperature detector 104 obtains the third temperature information of the oil outlet of the second radiator 15 in real time.

[0040] For the adjustment of the rotation speed of the first radiator 6, if at least one of the second temperature information and the third temperature information is lower than the first temperature information, the rotation speed of the first radiator 6 is controlled according to the first temperature information; if the third temperature information is higher than the first temperature information, the rotation speed of the first radiator 6 is controlled according to the third temperature information.

[0041] For the adjustment of the rotation speed of the second radiator 15, if at least one of the fourth temperature information and the fifth temperature information is lower than the first temperature information, the rotation speed of the second radiator 15 is controlled according to the first temperature information; if the fifth temperature information is higher than the first temperature information, the rotation speed of the first radiator 6 is controlled according to the fifth temperature information.

[0042] When the first temperature information detected by the first temperature detector 105 is higher than the preset maximum temperature, or when the first temperature information detected by the first temperature detector 105 is higher than the third temperature information and the fifth temperature information, it is necessary to give priority to considering the oil temperature of the hydraulic oil tank 9 and adjust the rotation speeds of the first radiator 6 and the second radiator 15 according to the first temperature information.

[0043] In this specific embodiment, when the temperature in the hydraulic oil tank 9 is relatively high, the first radiator 6 and the second radiator 15 are controlled to dissipate heat according to the oil temperature in the hydraulic oil tank 9; when the temperature in the hydraulic oil tank 9 is in a normal state, the rotation speed of the first radiator 6 is adjusted according to the temperature of the oil outlet of the first oil circuit, and the rotation speed of the second radiator 15 is adjusted according to the temperature of the oil outlet of the second oil circuit, so as to avoid the problem of energy waste when the oil temperatures of the two oil circuits are different during the unified adjustment process. Moreover, the oil temperature of the hydraulic oil tank 9 is given priority to ensure that the oil temperature in the hydraulic oil tank 9 meets the requirements.

[0044] The control mechanism 16 in this application can be an ECU (Electronic Control Unit), or other structures that meet the requirements, which will not be elaborated here.

[0045] In a specific embodiment, the hydraulic system further includes a third oil passage. The first end of the third oil passage is connected to the first oil passage, and the second end of the third oil passage is connected to the second oil passage. A communication control valve is provided in the third oil passage. The communication control valve is used to control the communication or disconnection between the first oil passage and the second oil passage, and the communication control valve is connected to the control mechanism 16.

[0046] The communication control valve in this specific embodiment can be a solenoid valve or other valve bodies that meet the requirements, which is specifically determined according to the actual situation and will not be elaborated here.

[0047] During actual use, when the flow rate of one of the first oil passage and the second oil passage is so large that the oil temperature at the outlet of the radiator cannot be reduced to the ideal range even when the radiator fan of this oil passage runs at full load, the control mechanism 16 opens the communication control valve, and the first oil passage and the second oil passage communicate with each other. Part of the hydraulic oil flows from one of the first oil passage and the second oil passage to the other oil passage to relieve the heat dissipation pressure of this oil passage.

[0048] In a specific embodiment, the first oil passage includes a first back pressure valve 5 and a second back pressure valve 3. One end of the first back pressure valve 5 is connected to the oil inlet of the first radiator 6, and the other end of the first back pressure valve 5 is connected to the first main valve 4. One end of the second back pressure valve 3 is connected to the first main valve 4, and the other end of the second back pressure valve 3 is connected to the hydraulic oil tank 9. The set pressure of the first back pressure valve 5 is less than the set pressure of the second back pressure valve 3. The second oil passage includes a third back pressure valve 12 and a fourth back pressure valve 14. One end of the third back pressure valve 12 is connected to the oil inlet of the second radiator 15, and the other end of the third back pressure valve 12 is connected to the second main valve 13. One end of the fourth back pressure valve 14 is connected to the second main valve 13, and the other end of the fourth back pressure valve 14 is connected to the hydraulic oil tank 9, and the set pressure of the third back pressure valve 12 is less than the set pressure of the fourth back pressure valve 14.

[0049] During actual use, when the system pressure is less than the set pressure of the second back pressure valve 3, the second back pressure valve 3 is in the closed state, and the hydraulic oil enters the first radiator 6 through the first back pressure valve 5. When the system pressure is greater than the set pressure of the second back pressure valve 3, at this time the system pressure is already relatively high, the second back pressure valve 3 is in the open state, part of the hydraulic oil enters the first radiator 6 through the first back pressure valve 5, and part of the hydraulic oil flows back to the hydraulic oil tank 9 through the second back pressure valve 3, causing the oil temperature of the hydraulic oil tank 9 to rise. There may be a phenomenon that the oil temperature in the hydraulic oil tank 9 is higher than the oil temperature at the outlet of the radiator. At this time, if the oil temperature of the hydraulic oil tank 9 is very high, regardless of the oil temperature at the outlet of the radiator, the control mechanism 16 will control both the first radiator 6 and the second radiator 15 to run at full load to quickly reduce the oil temperature of the hydraulic oil tank 9 to the ideal state.

[0050] When the system pressure is less than the set pressure of the fourth back-pressure valve 14, the fourth back-pressure valve 14 is in a closed state, and the hydraulic oil enters the second radiator 15 from the third back-pressure valve 12; when the system pressure is greater than the set pressure of the fourth back-pressure valve 14, at this time the system pressure is already relatively high, the fourth back-pressure valve 14 is in an open state, part of the hydraulic oil enters the second radiator 15 from the third back-pressure valve 12, and part of the hydraulic oil flows back to the hydraulic oil tank 9 through the fourth back-pressure valve 14, increasing the oil temperature of the hydraulic oil tank 9. It is possible that the oil temperature in the hydraulic oil tank 9 is higher than the oil temperature at the outlet of the radiator. At this time, if the oil temperature in the hydraulic oil tank 9 is very high, regardless of the oil temperature at the outlet of the radiator, the control mechanism 16 will control both the first radiator 6 and the second radiator 15 to operate at full load, so that the oil temperature in the hydraulic oil tank 9 can quickly drop to the ideal state.

[0051] The first radiator 6 and the second radiator 15 in this specific embodiment can be set as cooling fans. Therefore, during actual use, the rotation speeds of the first radiator 6 and the second radiator 15 can be controlled and adjusted according to the temperature information of the oil temperature. The main valve in this application can be set as a multi-way valve or other valve body structures that meet the requirements, which is specifically determined according to the actual situation and will not be elaborated here.

[0052] In addition to the above hydraulic system, this application also provides an oil temperature control method applied to the above hydraulic system. The oil temperature control method includes:

[0053] Step S1, obtaining the first temperature information detected by the first temperature detector 105, the second temperature information detected by the second temperature detector 101, the third temperature information detected by the third temperature detector 102, the fourth temperature information detected by the fourth temperature detector 103, and the fifth temperature information detected by the fifth temperature detector 104;

[0054] Step S2, determining whether at least one of the second temperature information and the third temperature information is lower than the first temperature information. If so, controlling the rotation speed of the first radiator 6 according to the first temperature information; if not, proceeding to step S3;

[0055] In step S2, generally, the temperature value of the second temperature information is higher than the temperature value of the third temperature information, and the temperature value of the first temperature information is lower than or equal to the temperature value of the third temperature information. When the temperature value of the first temperature information is higher than the temperature values of both the second temperature information and the third temperature information at the same time, it indicates that the oil temperature in the hydraulic oil tank 9 is already relatively high, and the rotation speed of the first radiator 6 needs to be controlled according to the temperature value of the first temperature information.

[0056] Step S3, controlling the rotation speed of the first radiator 6 according to the third temperature information;

[0057] Step S4, determine whether at least one of the fourth temperature information and the fifth temperature information is lower than the first temperature information. If so, control the rotation speed of the second radiator 15 according to the first temperature information; if not, proceed to step S4;

[0058] In step S4, generally, the temperature value of the fourth temperature information is higher than that of the fifth temperature information, and the temperature value of the first temperature information is lower than or equal to that of the fourth temperature information. When the temperature value of the first temperature information is higher than both the temperature values of the fourth temperature information and the fifth temperature information, it indicates that the oil temperature in the hydraulic oil tank 9 is already relatively high, and the rotation speed of the second radiator 15 needs to be controlled according to the temperature value of the first temperature information.

[0059] Step S4, control the rotation speed of the second radiator 15 according to the fifth temperature information.

[0060] In this specific embodiment, generally, the rotation speed of the first radiator 6 is controlled according to the third temperature information, and the rotation speed of the second radiator 15 is controlled according to the fifth temperature information; this avoids the problem of energy waste when the oil temperatures of the two oil circuits are different during the unified adjustment process; when the oil temperature in the hydraulic oil tank 9 is relatively high, the rotation speeds of the first radiator 6 and the second radiator 15 are preferentially controlled according to the first temperature information to ensure that the oil temperature in the hydraulic oil tank 9 meets the requirements.

[0061] In a specific embodiment, in step S2, controlling the rotation speed of the first radiator 6 according to the first temperature information includes:

[0062] Step S21, obtain the first gear information corresponding to the first temperature information according to the first temperature information;

[0063] Step S22, control the first radiator 6 to adjust to the corresponding gear according to the first gear information.

[0064] In step S3, controlling the rotation speed of the first radiator 6 according to the third temperature information includes:

[0065] Step S31, obtain the second gear information corresponding to the third temperature information according to the third temperature information;

[0066] Step S32, control the first radiator 6 to adjust to the corresponding gear according to the second gear information.

[0067] In step S4, controlling the rotation speed of the second radiator 15 according to the first temperature information includes:

[0068] Step S41, obtain the third gear information corresponding to the first temperature information according to the first temperature information;

[0069] Step S42: Control the second radiator 15 to adjust to the corresponding gear according to the third gear information.

[0070] In step S5, controlling the rotation speed of the second radiator 15 according to the fifth temperature information includes:

[0071] Step S51: Obtain the corresponding fourth gear information according to the fifth temperature information;

[0072] Step S52: Control the second radiator 15 to adjust to the corresponding gear according to the fourth gear information.

[0073] The specific gear control is set as Figure 2 As shown, the fan speed of the radiator is divided into multiple specific gears according to different oil temperature ranges, and the image relationship between the speed and the oil temperature is stepped. When the temperature is less than T1, the fan speed of the radiator is 0; when the temperature is less than T2 and greater than or equal to T1, the fan speed of the radiator is n1; when the temperature is less than T3 and greater than or equal to T2, the fan speed of the radiator is n2; when the temperature is greater than or equal to T3, the fan speed of the radiator is n3.

[0074] As shown in the following table, the oil temperature at the oil outlet of the first radiator 6 is the third temperature information detected by the third temperature detector 102. When the temperature value of the third temperature information is less than T1, the fan speed of the first radiator 6 is 0; when the temperature value of the third temperature information is less than T2 and greater than or equal to T1, the fan speed of the first radiator 6 is n1; when the temperature value of the third temperature information is less than T3 and greater than or equal to T2, the fan speed of the first radiator 6 is n2; when the temperature value of the third temperature information is greater than or equal to T3, the fan speed of the first radiator 6 is n3. The oil temperature at the oil outlet of the second radiator is the fifth temperature information detected by the fifth temperature detector 104. When the temperature value of the fifth temperature information is less than T1, the fan speed of the second radiator 15 is 0; when the temperature value of the fifth temperature information is less than T2 and greater than or equal to T1, the fan speed of the second radiator 15 is n1; when the temperature value of the fifth temperature information is less than T3 and greater than or equal to T2, the fan speed of the second radiator 15 is n2; when the temperature value of the fifth temperature information is greater than or equal to T3, the fan speed of the second radiator 15 is n3.

[0075]

[0076] Of course, according to different actual situations, the fan of the radiator can also be divided into different gear speeds according to different temperature values, which is specifically determined according to the actual situation.

[0077] In a specific embodiment, in step S2, controlling the rotation speed of the first radiator 6 according to the first temperature information includes:

[0078] Step S201: Obtain the first rotational speed information corresponding to the first temperature information according to the first temperature information and the temperature-rotational speed curve graph; the temperature-rotational speed curve graph is a schematic curve of temperature and rotational speed, and the slope of the temperature-rotational speed curve graph gradually increases during the process of temperature increasing from low to high;

[0079] Step S202: Control the rotation of the first radiator 6 according to the first rotational speed information.

[0080] In step S3, controlling the rotational speed of the first radiator 6 according to the third temperature information includes:

[0081] Step S301: Obtain the second rotational speed information corresponding to the third temperature information according to the third temperature information and the temperature-rotational speed curve graph;

[0082] Step S302: Control the rotation of the first radiator 6 according to the second rotational speed information.

[0083] In step S4, controlling the rotational speed of the second radiator 15 according to the first temperature information includes:

[0084] Step S401: Obtain the third rotational speed information corresponding to the first temperature information according to the first temperature information and the temperature-rotational speed curve graph;

[0085] Step S402: Control the rotation of the second radiator 15 according to the third rotational speed information.

[0086] In step S5, controlling the rotational speed of the second radiator 15 according to the fifth temperature information includes:

[0087] Step S501: Obtain the fourth rotational speed information corresponding to the fifth temperature information according to the fifth temperature information and the temperature-rotational speed curve graph;

[0088] Step S502: Control the rotation of the second radiator 15 according to the fourth rotational speed information.

[0089] As Figure 3 shown, the fan rotational speed of the radiator is adjusted according to different oil temperatures, and the fan rotational speed of the radiator is a stepless speed regulation scheme. The slope of the temperature-rotational speed curve graph gradually increases during the process of temperature increasing from low to high.

[0090] Of course, the temperature-rotational speed curve graph can also be other curves that meet the requirements, which are specifically determined according to the actual situation.

[0091] In this specific embodiment, adjusting the rotational speeds of the fans of the first radiator 6 and the second radiator 15 according to the temperature-rotational speed curve graph can achieve stepless adjustment of the fans of the first radiator 6 and the second radiator 15, and the adjustment process is convenient.

[0092] In a specific embodiment, in step S2, controlling the rotation speed of the first radiator 6 according to the first temperature information includes:

[0093] Step S2001, obtaining fifth rotation speed information corresponding to the first temperature information according to the first temperature information and the temperature-rotation speed linear graph; the temperature-rotation speed linear graph is a curve schematic diagram of temperature and rotation speed, and the slope of temperature and rotation speed in the temperature-rotation speed curve graph is a fixed value;

[0094] Step S2002, controlling the rotation of the first radiator 6 according to the fifth rotation speed information.

[0095] In step S3, controlling the rotation speed of the first radiator 6 according to the third temperature information includes:

[0096] Step S3001, obtaining sixth rotation speed information corresponding to the third temperature information according to the third temperature information and the temperature-rotation speed linear graph;

[0097] Step S3002, controlling the rotation of the first radiator 6 according to the sixth rotation speed information.

[0098] In step S4, controlling the rotation speed of the second radiator 15 according to the first temperature information includes:

[0099] Step S4001, obtaining seventh rotation speed information corresponding to the first temperature information according to the first temperature information and the temperature-rotation speed linear graph;

[0100] Step S4002, controlling the rotation of the second radiator 15 according to the seventh rotation speed information.

[0101] In step S5, controlling the rotation speed of the second radiator 15 according to the fifth temperature information includes:

[0102] Step S5001, obtaining eighth rotation speed information corresponding to the fifth temperature information according to the fifth temperature information and the temperature-rotation speed linear graph;

[0103] Step S5002, controlling the rotation of the second radiator 15 according to the eighth rotation speed information.

[0104] As Figure 4 shown, the fan rotation speed of the radiator is adjusted according to different oil temperatures, and the fan rotation speed of the radiator is a stepless speed regulation scheme. The slope of temperature and rotation speed in the temperature-rotation speed linear graph is a fixed value.

[0105] Of course, the temperature-rotation speed linear graph can also be other lines that meet the requirements, which are specifically determined according to the actual situation.

[0106] In this specific embodiment, by adjusting the rotation speeds of the fans of the first radiator 6 and the second radiator 15 according to the temperature-rotation speed linear graph, stepless adjustment of the fans of the first radiator 6 and the second radiator 15 can be achieved, and the adjustment process is convenient.

[0107] In a specific embodiment, before step S1, it includes:

[0108] Step S01, determine whether it is the startup stage of the hydraulic system. If so, control the first radiator 6 and the second radiator 15 to stop rotating; if not, enter step S1.

[0109] The hydraulic system in this application can be applied to engineering vehicles or other equipment that meets the requirements, which is specifically determined according to the actual situation and will not be elaborated here.

[0110] When the hydraulic system is just started, the oil temperature of the hydraulic oil tank 9 is very low. Since heat is required to raise the hydraulic oil temperature to the ideal state, at this time, regardless of the oil temperature at the outlet of the radiator, the fans of the two first radiators 6 and the fans of the second radiator 15 do not operate.

[0111] In a specific embodiment, the hydraulic system further includes a third oil circuit. The first end of the third oil circuit is connected to the first oil circuit, and the second end of the third oil circuit is connected to the second oil circuit; a connection control valve is provided in the third oil circuit, and the connection control valve is used to control the connection or disconnection between the first oil circuit and the second oil circuit.

[0112] After step S1 and before step S2, it includes:

[0113] Step S11, determine whether it is true that one of the third temperature information and the fifth temperature information is higher than the preset maximum temperature value and the other is lower than the preset maximum temperature value. If so, control the connection control valve to open to connect the first oil circuit and the second oil circuit; if not, control the connection control valve to close to disconnect the first oil circuit and the second oil circuit.

[0114] In this specific embodiment, by setting the connection control valve, the first oil circuit and the second oil circuit can be connected. When the oil temperatures of the first oil circuit and the second oil circuit are quite different, the hydraulic oil of the first oil circuit and the hydraulic oil of the second oil circuit can be mixed to reduce the oil temperature of the oil circuit with a higher oil temperature, and avoid the normal operation being affected by too high an oil temperature.

[0115] In a specific embodiment, the hydraulic system further includes a first warning mechanism and a second warning mechanism; both the first warning mechanism and the second warning mechanism are connected to the control mechanism 16;

[0116] After step S1 and before step S2, it includes:

[0117] Step S12: Determine whether the second temperature information is lower than the third temperature information. If so, control the first warning mechanism to issue a warning message.

[0118] In step S12, when the second temperature information is lower than the third temperature information, it indicates that the first radiator 6 is not functioning. At this time, the first warning mechanism issues a warning message, and the staff can take timely measures. When the second temperature information is higher than the third temperature information, it indicates that the first radiator 6 is in a working state and can play a role in cooling and heat dissipation.

[0119] Step S13: Determine whether the fourth temperature information is lower than the fifth temperature information. If so, control the second warning mechanism to issue a warning message.

[0120] In step S13, when the fourth temperature information is lower than the fifth temperature information, it indicates that the second radiator 15 is not functioning. At this time, the second warning mechanism issues a warning message, and the staff can take timely measures. When the fourth temperature information is higher than the fifth temperature information, it indicates that the second radiator 15 is in a working state and can play a role in cooling and heat dissipation.

[0121] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. Any combination of all the embodiments provided by the present invention falls within the protection scope of this invention, and will not be elaborated herein.

[0122] The above has introduced in detail the hydraulic system and the oil temperature control method provided by the present invention. Specific examples are used herein to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic system, characterized in that, Comprising: A hydraulic oil tank (9) for supplying hydraulic oil to a first oil circuit and a second oil circuit, the hydraulic oil tank (9) being provided with a first temperature detector (105); The first oil circuit includes a first main pump (2), a first main valve (4), a first radiator (6), a second temperature detector 101 disposed at the inlet of the first radiator (6), and a third temperature detector (102) disposed at the outlet of the first radiator (6); The second oil circuit includes a second main pump (11), a second main valve (13), a second radiator (15), a fourth temperature detector (103) disposed at the inlet of the second radiator (15), and a fifth temperature detector (104) disposed at the outlet of the second radiator (15); A confluence mechanism (7), both the first main valve (4) and the second main valve (13) being connected to the confluence mechanism (7); An actuator (8) connected to the confluence mechanism (7); A control mechanism (16), the first temperature detector (105), the second temperature detector (101), the third temperature detector (102), the fourth temperature detector (103), the fifth temperature detector (104), the first radiator (6), and the second radiator (15) all being connected to the control mechanism (16), the control mechanism (16) being configured to adjust the rotational speeds of the first radiator (6) and the second radiator (15) according to the temperature information detected by the first temperature detector (105), the second temperature detector (101), the third temperature detector (102), the fourth temperature detector (103), and the fifth temperature detector (104).

2. The hydraulic system according to claim 1, characterized in that, It further includes a third oil circuit, a first end of the third oil circuit being connected to the first oil circuit, and a second end of the third oil circuit being connected to the second oil circuit; The third oil circuit is provided with a connection control valve for controlling the connection or disconnection between the first oil circuit and the second oil circuit.

3. The hydraulic system according to claim 1, characterized in that, The first oil circuit includes a first back pressure valve (5) and a second back pressure valve (3), one end of the first back pressure valve (5) being connected to the inlet of the first radiator (6), the other end of the first back pressure valve (5) being connected to the first main valve (4), one end of the second back pressure valve (3) being connected to the first main valve (4), and the other end of the second back pressure valve (3) being connected to the hydraulic oil tank (9), the set pressure of the first back pressure valve (5) being less than the set pressure of the second back pressure valve (3); The second oil circuit includes a third back pressure valve (12) and a fourth back pressure valve (14), one end of the third back pressure valve (12) being connected to the inlet of the second radiator (15), the other end of the third back pressure valve (12) being connected to the second main valve (13), one end of the fourth back pressure valve (14) being connected to the second main valve (13), and the other end of the fourth back pressure valve (14) being connected to the hydraulic oil tank (9), and the set pressure of the third back pressure valve (12) being less than the set pressure of the fourth back pressure valve (14).

4. An oil temperature control method, characterized in that, Applied to the hydraulic system described in any one of the above claims 1-3, the oil temperature control method includes: Obtain the first temperature information detected by the first temperature detector (105), the second temperature information detected by the second temperature detector (101), the third temperature information detected by the third temperature detector (102), the fourth temperature information detected by the fourth temperature detector (103), and the fifth temperature information detected by the fifth temperature detector (104); Judge whether it is established that at least one of the second temperature information and the third temperature information is lower than the first temperature information. If so, control the rotation speed of the first radiator (6) according to the first temperature information; if not, proceed to the next step; Control the rotation speed of the first radiator (6) according to the third temperature information; Judge whether it is established that at least one of the fourth temperature information and the fifth temperature information is lower than the first temperature information. If so, control the rotation speed of the second radiator (15) according to the first temperature information; if not, proceed to the next step; Control the rotation speed of the second radiator (15) according to the fifth temperature information.

5. The oil temperature control method according to claim 4, characterized in that, The controlling the rotation speed of the first radiator (6) according to the first temperature information includes: Obtain the first gear information corresponding to the first temperature information according to the first temperature information; Control the first radiator (6) to adjust to the corresponding gear according to the first gear information; The controlling the rotation speed of the first radiator (6) according to the third temperature information includes: Obtain the second gear information corresponding to the third temperature information according to the third temperature information; Control the first radiator (6) to adjust to the corresponding gear according to the second gear information; The controlling the rotation speed of the second radiator (15) according to the first temperature information includes: Obtain the third gear information corresponding to the first temperature information according to the first temperature information; Control the second radiator (15) to adjust to the corresponding gear according to the third gear information; The controlling the rotation speed of the second radiator (15) according to the fifth temperature information includes: Obtain the fourth gear information corresponding to the fifth temperature information according to the fifth temperature information; Control the second radiator (15) to adjust to the corresponding gear according to the fourth gear information.

6. The oil temperature control method according to claim 4, characterized in that The controlling the rotation speed of the first radiator (6) according to the first temperature information includes: Obtain the first rotation speed information corresponding to the first temperature information according to the first temperature information and the temperature-rotation speed curve graph; the temperature-rotation speed curve graph is a curve schematic diagram of temperature and rotation speed, and the slope of the temperature-rotation speed curve graph gradually increases during the process of the temperature increasing from low to high in the temperature-rotation speed curve graph; Control the first radiator (6) to rotate according to the first rotation speed information; The controlling the rotation speed of the first radiator (6) according to the third temperature information includes: Obtain the second rotation speed information corresponding to the third temperature information according to the third temperature information and the temperature-rotation speed curve graph; Control the rotation of the first radiator (6) according to the second rotational speed information; The controlling the rotational speed of the second radiator (15) according to the first temperature information includes: Obtain the corresponding third rotational speed information of the first temperature information according to the first temperature information and the temperature-rotational speed curve graph; Control the rotation of the second radiator (15) according to the third rotational speed information; The controlling the rotational speed of the second radiator (15) according to the fifth temperature information includes: Obtain the corresponding fourth rotational speed information of the fifth temperature information according to the fifth temperature information and the temperature-rotational speed curve graph; Control the rotation of the second radiator (15) according to the fourth rotational speed information.

7. The oil temperature control method according to claim 4, characterized in that, The controlling the rotational speed of the first radiator (6) according to the first temperature information includes: Obtain the corresponding fifth rotational speed information of the first temperature information according to the first temperature information and the temperature-rotational speed straight-line graph; the temperature-rotational speed straight-line graph is a curve schematic diagram of temperature and rotational speed, and the slope of temperature and rotational speed in the temperature-rotational speed curve graph is a fixed value; Control the rotation of the first radiator (6) according to the fifth rotational speed information; The controlling the rotational speed of the first radiator (6) according to the third temperature information includes: Obtain the corresponding sixth rotational speed information of the third temperature information according to the third temperature information and the temperature-rotational speed straight-line graph; Control the rotation of the first radiator (6) according to the sixth rotational speed information; The controlling the rotational speed of the second radiator (15) according to the first temperature information includes: Obtain the corresponding seventh rotational speed information of the first temperature information according to the first temperature information and the temperature-rotational speed straight-line graph; Control the rotation of the second radiator (15) according to the seventh rotational speed information; The controlling the rotational speed of the second radiator (15) according to the fifth temperature information includes: Obtain the corresponding eighth rotational speed information of the fifth temperature information according to the fifth temperature information and the temperature-rotational speed straight-line graph; Control the rotation of the second radiator (15) according to the eighth rotational speed information.

8. The oil temperature control method according to claim 4, wherein Before obtaining the first temperature information detected by the first temperature detection component (105), the second temperature information detected by the second temperature detection component (101), the third temperature information detected by the third temperature detection component (102), the fourth temperature information detected by the fourth temperature detection component (103), and the fifth temperature information detected by the fifth temperature detection component (104), it includes: Judge whether it is the starting stage of the hydraulic system. If so, control both the first radiator (6) and the second radiator (15) to stop rotating; if not, enter the step of obtaining the first temperature information detected by the first temperature detection component (105), the second temperature information detected by the second temperature detection component (101), the third temperature information detected by the third temperature detection component (102), the fourth temperature information detected by the fourth temperature detection component (103), and the fifth temperature information detected by the fifth temperature detection component (104).

9. The oil temperature control method according to claim 4, characterized in that, The hydraulic system further includes a third oil passage. The first end of the third oil passage is connected to the first oil passage, and the second end of the third oil passage is connected to the second oil passage. A communication control valve is provided in the third oil passage, and the communication control valve is used to control the communication or disconnection between the first oil passage and the second oil passage. Before determining whether at least one of the second temperature information and the third temperature information is lower than the first temperature information after obtaining the first temperature information detected by the first temperature detector (105), the second temperature information detected by the second temperature detector (101), the third temperature information detected by the third temperature detector (102), the fourth temperature information detected by the fourth temperature detector (103), and the fifth temperature information detected by the fifth temperature detector (104), it includes: Determine whether one of the third temperature information and the fifth temperature information is higher than a preset maximum temperature value and the other is lower than the preset maximum temperature value. If so, control the communication control valve to open to connect the first oil passage and the second oil passage; if not, control the communication control valve to close to disconnect the first oil passage and the second oil passage.

10. The oil temperature control method according to claim 4, characterized in that, The hydraulic system further includes a first warning mechanism and a second warning mechanism. Both the first warning mechanism and the second warning mechanism are connected to the control mechanism (16). Before determining whether at least one of the second temperature information and the third temperature information is lower than the first temperature information after obtaining the first temperature information detected by the first temperature detector (105), the second temperature information detected by the second temperature detector (101), the third temperature information detected by the third temperature detector (102), the fourth temperature information detected by the fourth temperature detector (103), and the fifth temperature information detected by the fifth temperature detector (104), it includes: Determine whether the second temperature information is lower than the third temperature information. If so, control the first warning mechanism to send a warning message. Determine whether the fourth temperature information is lower than the fifth temperature information. If so, control the second warning mechanism to send a warning message.

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