Heat dissipation equipment, heat dissipation control method, engineering machinery and computer readable storage medium

Abstract

The invention relates to heat dissipation equipment for engineering machinery. The heat dissipation equipment comprises a first oil dissipation assembly and a second oil dissipation assembly, the second oil radiator assembly is provided with a second radiator and a second fan, and the first oil radiator assembly and the second oil radiator assembly are arranged in parallel; the information acquisition unit is used for acquiring the environment temperature, the altitude, the load coefficient and the hydraulic oil temperature of the environment where the engineering machinery is located; the controller is respectively connected with the information acquisition unit, the first fan and the second fan, and is configured to receive data information from the information acquisition unit, calculate a cooling power total demand value of the heat dissipation equipment and a cooling power demand value distributed to the first oil radiator assembly and the second oil radiator assembly based on the received data information, and send the cooling power total demand value to the first oil radiator assembly and the second oil radiator assembly; and controlling the first oil radiator assembly and / or the second oil radiator assembly based on the allocated cooling power demand value. The invention further relates to a heat dissipation control method, engineering machinery and a computer readable storage medium.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling systems for engineering machinery, and in particular to a heat dissipation device for cooling hydraulic oil, a heat dissipation control method, an engineering machinery having the heat dissipation device, and a computer-readable storage medium for executing the heat dissipation control method. Background Art

[0002] In construction machinery such as hydraulic excavators, the energy loss of the hydraulic system during operation includes not only general mechanical losses, pipeline losses, and pump efficiency losses, but also flow losses of hydraulic oil. The power loss ΔN=PΔQ (P is the hydraulic oil pressure, ΔQ is the lost flow) caused by flow loss is composed of the following parts:

[0003] ① Losses caused by leakage of hydraulic system;

[0004] ② When each control valve is in the middle position (excavator is not working), if the engine speed is not reduced, the loss of hydraulic power is: Ny1 = P0Qmax

[0005] Where: P0——back pressure of hydraulic system; Qmax——maximum flow of hydraulic pump;

[0006] ③ Overflow loss. The hydraulic oil power loss caused by overflow is: Ny2=PmaxΔQ

[0007] Where: Pmax is the opening pressure of the overflow valve (approximately equal to the maximum pressure of the system); ΔQ is the overflow volume.

[0008] The total power loss of the engine-hydraulic pump system caused by overflow is: Nz = PmaxΔQ / η m η y , where η m ——Engine mechanical efficiency, η y ——Total efficiency of hydraulic pump.

[0009] In addition, the energy loss of the hydraulic system also includes the pressure loss of the hydraulic oil, which is mainly composed of two parts: one part is the loss along the way when the hydraulic oil passes through pipes and joints, which is inevitable; the other part is the loss caused when the hydraulic oil passes through the control valve throttling when the excavator performs fine operations.

[0010] All the above hydraulic oil flow loss and hydraulic oil pressure loss will eventually turn into heat, causing the hydraulic oil temperature to rise, the system to overheat, and affect the normal operation of the machine. Therefore, a hydraulic oil radiator is required to reduce the hydraulic oil temperature and balance the heating of the hydraulic system.

[0011] At present, the hydraulic oil radiator adopts an indirect cooling heat dissipation mechanism, that is, the radiator is placed in the oil return channel of the hydraulic system, and the forced cooling air passes through the hydraulic oil flowing on the tube side of the radiator to take away the heat of the hydraulic oil.

[0012] The hydraulic oil radiator is used to achieve the heat dissipation requirements of the excavator when performing earthwork operations. The usual layout of the excavator heat dissipation system is: the hydraulic oil radiator, engine coolant radiator, air-to-air intercooler, air conditioning condenser and other heat dissipation devices are concentrated together to form a cooling pack, which is placed on the fan side of the engine. The fan provides forced cooling air to exchange heat with the hydraulic oil, coolant, coolant and other heat media in the cooling pack that need to dissipate heat, thereby reducing the temperature of each heat medium in the cooling pack.

[0013] In this cooling system layout, the cooling pack and the hydraulic oil radiator therein have fixed sizes. For different application conditions of the excavator, the usual design idea is to design the fixed size according to the maximum cooling demand, so as to obtain a fixed maximum cooling capacity. Generally, manufacturers design the radiator according to the maximum cooling capacity required in extreme cases. This overly conservative design causes the radiator to be too large in size, occupying a large space and having high cost. In addition, it will also cause the machine to be overcooled when the ambient temperature is low, affecting the efficiency of the machine, reducing the work done and wasting energy. If it is designed according to conventional normal dimensions, it cannot meet the cooling requirements at high altitudes, high ambient temperatures and high loads. Therefore, the existing hydraulic oil cooling system has disadvantages: when working under different environmental conditions and load conditions, the heat dissipation capacity cannot be adjusted accordingly. For example, when the excavator is operating at low altitude, low ambient temperature and low load conditions, the cooling capacity of the heat dissipation system is likely to be excessive, causing overcooling. Conversely, when the excavator is operating at high altitude, high ambient temperature and high load conditions, the cooling capacity of the heat dissipation system is likely to be insufficient, causing the hydraulic oil to overheat, affecting the efficiency of the machine, and in severe cases even causing system failure or inability to operate normally.

[0014] Accordingly, the present invention is directed to overcoming one or more of the above-mentioned problems. Summary of the invention

[0015] The present invention aims at the design problem of the heat dissipation system for engineering machinery and proposes an improved hydraulic oil heat dissipation device, which can adaptively and automatically adjust the heat dissipation capacity according to the changes in the environmental conditions and load conditions of the excavator, and only needs to be modified on the basis of the existing heat dissipation system (such as a cooling pack), which greatly reduces the system manufacturing cost.

[0016] According to one aspect of the present invention, there is provided a heat dissipation device for an engineering machine, the heat dissipation device comprising a first oil dissipation assembly, the first oil dissipation assembly comprising a first radiator and a first fan, the first radiator being configured to cool a first hydraulic oil flow flowing therein by means of an airflow generated by the first fan, characterized in that the heat dissipation device further comprises:

[0017] a second oil dissipation assembly, the second oil dissipation assembly comprising a second radiator and a second fan, the second radiator being configured to cool a second hydraulic oil flow flowing therein by means of an airflow generated by the second fan, wherein a first hydraulic oil dissipation pipeline in which the first hydraulic oil flow is located and a second hydraulic oil dissipation pipeline in which the second hydraulic oil flow is located are connected in parallel and are fluidically connected at their downstream ends to a hydraulic oil tank of the engineering machine;

[0018] An information collection unit, which is used to collect the following data information: ambient temperature and altitude representing the environment in which the engineering machinery is located, a load factor representing the load condition of the engineering machinery, and a hydraulic oil temperature in a hydraulic oil tank; and

[0019] A controller, wherein the controller is connected to the information acquisition unit, the first fan, and the second fan, respectively, and the controller is configured to receive data information from the information acquisition unit, calculate a total cooling power requirement value of the heat dissipation device and cooling power requirement values ​​allocated to the first oil dissipation component and the second oil dissipation component based on the received data information, and control the fan speed and / or radiator oil side flow of the first oil dissipation component and / or the second oil dissipation component based on the allocated cooling power requirement values ​​to make the hydraulic oil temperature reach a preset hydraulic oil thermal equilibrium temperature.

[0020] Advantageously, a first speed regulating valve is provided in the first hydraulic oil heat dissipation pipeline upstream of the first radiator, and the controller is connected to the first speed regulating valve to control the first speed regulating valve to adjust the flow rate of the hydraulic oil entering the first radiator.

[0021] Advantageously, a second speed regulating valve is provided in the second hydraulic oil heat dissipation pipeline upstream of the second radiator, and the controller is connected to the second speed regulating valve to control the second speed regulating valve to adjust the flow rate of the hydraulic oil entering the second radiator.

[0022] Advantageously, the first hydraulic oil heat dissipation pipeline and the second hydraulic oil heat dissipation pipeline are combined at the upstream connection portion thereof, and an oil return back pressure valve and a hydraulic valve are provided in the upstream oil circuit of the connection portion, the oil return back pressure valve is connected to the oil return output end of the hydraulic valve, and the oil inlet input end of the hydraulic valve is connected to the hydraulic pump.

[0023] Advantageously, the hydraulic valve is connected to a hydraulic cylinder or a hydraulic motor to drive the hydraulic cylinder or the hydraulic motor with the aid of hydraulic oil; and / or, the hydraulic pump is connected to an engine output shaft; and / or, a return oil bypass valve is provided in the oil circuit connecting the return oil output end of the hydraulic valve and the hydraulic oil tank.

[0024] Advantageously, the engineering machinery comprises a cooling package, which comprises at least one of an engine coolant radiator, an air-to-air intercooler, an air conditioning condenser and a first radiator, wherein the first radiator is a main radiator and the second radiator is an auxiliary radiator arranged outside the cooling package.

[0025] Advantageously, the first fan is a direct drive fan, an electrically driven fan or a silicone oil clutch fan.

[0026] Advantageously, the second fan is an electrically driven fan, a hydraulic motor driven fan or a torque converter driven fan.

[0027] According to another aspect of the present invention, there is provided an engineering machine, which comprises a hydraulic oil tank and a heat dissipation device fluidically connected to the hydraulic oil tank, wherein the heat dissipation device is the above-mentioned heat dissipation device.

[0028] Advantageously, the engineering machinery includes a cooling package, which includes at least one of an engine coolant radiator, an air-to-air intercooler, an air conditioning condenser and the first radiator, and the second radiator is arranged between the cooling package and the cab or in an area close to a hydraulic oil tank or a fuel tank.

[0029] Advantageously, a display screen electrically connected to the controller is provided in the cab of the engineering machine, and the display screen is configured to display at least the altitude, the ambient temperature, the hydraulic oil temperature and the load factor.

[0030] Advantageously, the display screen further comprises an input control interface for transmitting control instructions received from an operator to the controller.

[0031] According to another aspect of the present invention, there is provided a heat dissipation control method performed by using the above heat dissipation device, comprising the following steps:

[0032] Information collection step: The information collection unit collects the following data information: ambient temperature and altitude representing the environment in which the construction machinery is located, load factor of the construction machinery, and hydraulic oil temperature in the hydraulic oil tank;

[0033] Calculation and allocation step: based on the collected data information, calculating the total cooling power requirement value of the heat dissipation device and the cooling power requirement value allocated to the first oil heat sink assembly and the second oil heat sink assembly;

[0034] Control and adjust step: controlling the fan speed and / or the oil-side flow rate of the first oil dissipation assembly and / or the second oil dissipation assembly based on the allocated cooling power demand value.

[0035] Advantageously, in the calculation allocation step, the total cooling power demand value is compared with the maximum cooling power design value of the first oil radiator assembly. If the total cooling power demand value is less than or equal to the maximum cooling power design value of the first oil radiator assembly, the cooling power demand value allocated to the second oil radiator assembly is set to zero. If the total cooling power demand value is greater than the maximum cooling power design value of the first oil radiator assembly, it is determined to enable the second oil radiator assembly. In the present application, "enabling the second oil radiator assembly" means that hydraulic oil flows through the second radiator and the second fan is in a running or stopped state.

[0036] Advantageously, in the calculation and allocation step, if the total cooling power requirement value is greater than the maximum cooling power design value of the first oil dissipating assembly, the difference between the total cooling power requirement value and the maximum cooling power design value of the first oil dissipating assembly is calculated, and a cooling power requirement value equal to the calculated difference is allocated to the second oil dissipating assembly.

[0037] Advantageously, in the calculation and allocation step, in response to an external input instruction for forcibly enabling the second radiator, the total cooling power demand is allocated to both the first radiator and the second radiator according to a predetermined quota, and in the control and adjustment step, the fan speeds of the first fan and the second fan and / or the radiator oil side flow of the first radiator and the second radiator are respectively controlled according to the allocated cooling power demand values.

[0038] Advantageously, the control and adjustment step includes controlling the oil side flow of the corresponding radiator by controlling a first speed regulating valve and / or a second speed regulating valve provided in a hydraulic oil heat dissipation pipeline where the first radiator and / or the second radiator are located.

[0039] According to another aspect of the present invention, there is provided a computer-readable storage medium on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a controller, the above-mentioned heat dissipation control method is implemented.

[0040] By utilizing the heat dissipation device and the heat dissipation method of the present invention, through the combined use of the first oil dissipation component and the second oil dissipation component and the electrical control based on the collected data information to adjust the variable fan speed, the return oil circuit diversion flow, etc., it is possible to provide cooling power that can be infinitely and freely adjusted within a large range in real time and sensitively. Therefore, the engineering machinery with the heat dissipation device has high adaptability to different application conditions, is easy to use and promote, and has low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Features and advantages of one example of the present invention will become apparent with reference to the following detailed description and accompanying drawings, in which:

[0042] Figure 1 A schematic top view showing the arrangement of a heat dissipation device in an engineering machinery according to the present invention;

[0043] Figure 2 A schematic diagram showing the connection structure of the oil circuit of the heat dissipation device according to the present invention;

[0044] Figure 3 A schematic diagram showing the principle of the oil circuit and electrical connection circuit of the engineering machinery according to the present invention;

[0045] Figure 4 A control flow chart showing a heat dissipation control method according to the present invention; and

[0046] Figure 5 A schematic diagram showing the arrangement of a second oil dispersion assembly of a heat dissipation device in an engineering machinery according to the present invention is shown. DETAILED DESCRIPTION

[0047] Reference will now be made in detail to various embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts.

[0048] The engineering machine 1 according to the present invention is described by taking a hydraulic excavator as an example. Figure 1 In the top view of the hydraulic excavator shown, it can be seen that the engine E is arranged in the central area of ​​one end of the excavator platform. The cooling pack CP is arranged in the side area of ​​the engine. The cooling pack includes at least one of an engine coolant radiator, an air-to-air intercooler, and an air conditioning condenser. The cab CB is arranged on the excavator platform on the same longitudinal side as the longitudinal side where the cooling pack is located, and is spaced apart from the cooling pack in the longitudinal direction. The hydraulic oil tank HT and the fuel tank FT are arranged on the side opposite to the longitudinal side where the cab is located. A display screen SC electrically connected to the engine control module ECM is arranged in the cab. The display screen is configured to display at least the ambient altitude, ambient temperature, hydraulic oil temperature, and load factor of the construction machinery. The display screen SC also includes an input control interface (such as a touch screen button) for transmitting the control instructions received from the operator to the engine control module ECM.

[0049] exist Figure 1 In the embodiment shown, the hydraulic oil heat dissipation device 10 of the engineering machinery according to the present invention comprises a first oil dissipation assembly 11 and a second oil dissipation assembly 12. The first oil dissipation assembly 11 is located in the cooling pack CP, and the second oil dissipation assembly 12 is arranged outside the cooling pack CP, for example, near the hydraulic oil tank HT or the fuel tank FT (see Figure 5 ), for example, set in e.g. Figure 1 As an alternative, the second oil dispersion assembly 12 may also be arranged between the cooling package and the cab, for example Figure 1 The heat dissipation device 10 according to the present invention comprises a controller 13. In the embodiment shown, an engine control module is used as the controller.

[0050] Combination Figure 1 and Figure 2 The first oil dispersion assembly 11 includes a first radiator 110 and a first fan 111. The first radiator 110 is configured to cool the first hydraulic oil flow flowing therein by means of the airflow generated by the first fan 111. The second oil dispersion assembly 12 includes a second radiator 120 and a second fan 121. The second radiator 120 is configured to cool the second hydraulic oil flow flowing therein by means of the airflow generated by the second fan 121. In the illustrated embodiment, the first radiator 110 is arranged in the cooling package CP and serves as a main radiator. The first fan 111 is a fan shared by the heat exchangers in the cooling package, for example, a direct-drive fan driven by the engine. It can be understood that the first fan can also be an electrically driven fan or a silicone oil clutch fan. The second radiator 120 is integrated on the fuel tank FT housing and serves as an auxiliary radiator. The second fan can be an electrically driven fan, a hydraulic motor driven fan, or a torque converter driven fan.

[0051] Reference Figure 2 , the first hydraulic oil heat dissipation pipeline I where the first hydraulic oil flows and the second hydraulic oil heat dissipation pipeline II where the second hydraulic oil flows are connected in parallel. In the illustrated embodiment, a first speed regulating valve 11a is provided in the first hydraulic oil heat dissipation pipeline I. The first speed regulating valve 11a is electrically connected to the controller 13, for example, to control the first speed regulating valve, thereby adjusting the flow rate of the hydraulic oil entering the first radiator. Advantageously, the first speed regulating valve 11a is arranged upstream of the first radiator 110. Similarly, a second speed regulating valve 12a is provided in the second hydraulic oil heat dissipation pipeline II. The second speed regulating valve 12a is electrically connected to the controller 13, for example, to control the second speed regulating valve, thereby adjusting the flow rate of the hydraulic oil entering the second radiator. Advantageously, the second speed regulating valve 12a is arranged upstream of the second radiator 120.

[0052] In the heat dissipation device according to the present invention, the first speed regulating valve connected to the first radiator and the second speed regulating valve connected to the second radiator are optional configurations, and both speed regulating valves can be selected at the same time, or any one of the speed regulating valves can be selected, or none of them can be used. The setting parameters of the first speed regulating valve and the second speed regulating valve may be the same or slightly different (depending on whether the back pressures of the corresponding radiators are the same) to ensure the need for diversion. The first speed regulating valve or the second speed regulating valve can be implemented as an electronically controlled speed regulating valve or a valve composed of a hydraulic valve and an electromagnetic pressure regulating valve.

[0053] See also Figure 2 , the upstream end of the first hydraulic oil heat dissipation pipeline I and the upstream end of the second hydraulic oil heat dissipation pipeline II are connected to the inflow oil circuit S-in through the first three-way interface V-in. The inflow oil circuit is provided with a return oil back pressure valve 14 and a hydraulic valve 15, the return oil back pressure valve 14 is connected to the return oil output end 151 of the hydraulic valve 15, and the oil inlet input end 152 of the hydraulic valve 15 is connected to the hydraulic pump 16. Advantageously, the hydraulic pump 16 is connected to the output shaft of the engine E and is driven to rotate by the engine. The hydraulic valve 15 is connected to the hydraulic device 17 (such as a hydraulic cylinder or a hydraulic motor) to drive the hydraulic device to work with the help of hydraulic oil. The first hydraulic oil heat dissipation pipeline I and the second hydraulic oil heat dissipation pipeline II are fluidly connected to the hydraulic oil tank HT at their downstream ends. The downstream end of the first hydraulic oil heat dissipation pipeline and the downstream end of the second hydraulic oil heat dissipation pipeline are connected to the outflow oil circuit S-out through the second three-way interface V-out. The outflow oil circuit is fluidly connected to the hydraulic oil tank HT. In the illustrated embodiment, a return oil bypass valve 18 is provided in the oil circuit connecting the return oil output end 151 of the hydraulic valve 15 and the hydraulic oil tank HT, for opening the return oil bypass valve when specific conditions are met (for example, the oil circuit of the heat dissipation device is blocked), so that the return oil from the hydraulic valve flows directly back to the hydraulic oil tank without passing through the heat dissipation device.

[0054] The heat dissipation device 10 according to the present invention further comprises an information collection unit 19 (see Figure 3 ), which is configured to collect the following data information: ambient temperature and altitude representing the environment where the engineering machinery is located, load factor representing the load condition of the engineering machinery, and hydraulic oil temperature in the hydraulic oil tank. The information collection unit 19 is connected to the input end of the controller 13 to input the collected data information to the controller 13. Figure 3 As shown, the information acquisition unit 19 exemplarily includes a GPS altitude barometer for measuring the ambient altitude (air pressure), a temperature meter for measuring the ambient temperature, a temperature sensor for measuring the temperature of the hydraulic oil, and a pressure sensor for measuring the pump pressure of the hydraulic pump. It is understood that the information acquisition unit may also include a device for measuring other real-time state parameter data of the engineering machinery, such as a flow meter for measuring the flow of the hydraulic pump, a tachometer for measuring the engine speed, the current provided by the controller to the hydraulic pump, and the like. More state parameter data is conducive to the use of a more accurate calculation model to provide the load factor of the engineering machinery. For example, the pump pressure of the hydraulic pump pressure sensor and the current provided by the controller to the pump can be comprehensively considered to evaluate the load factor characterizing the load condition.

[0055] In the heat dissipation device 10 according to the present invention, the controller 13 is configured to receive data information from the information acquisition unit 19, calculate the total cooling power requirement value of the heat dissipation device and the cooling power requirement values ​​allocated to the first oil dissipation component and the second oil dissipation component based on the received data information, and control the adjustable heat dissipation parameters (including fan speed and / or radiator oil side flow) of the first oil dissipation component and / or the second oil dissipation component based on the allocated cooling power requirement values ​​so that the hydraulic oil temperature reaches a preset hydraulic oil thermal equilibrium temperature. Figure 3 In the figure, the solid line indicates the oil circuit connection, and the dotted line indicates the electrical signal connection. Figure 3 As shown, the output end of the controller is electrically connected to the first fan wire interface and the second fan wire interface to control the speed of the first fan and / or the second fan. In the embodiment where the hydraulic oil heat dissipation pipeline is provided with a first speed regulating valve and / or a second speed regulating valve, the output end of the controller is electrically connected to the first speed regulating valve and / or the second speed regulating valve to control the oil side flow of the radiator.

[0056] The total cooling power requirement of the heat dissipation equipment P t =f(p,t,T o , LF), represents the total cooling power demand value P t is the ambient air pressure p (or altitude), ambient temperature t, hydraulic oil temperature T o and the load factor LF. The distribution of the cooling power requirements of the first oil dispersion assembly 11 and the second oil dispersion assembly 12 can also be controlled by a preset distribution ratio or distribution model, or by a matching model input by an operator. Thus, the combined cooling power of the first oil dispersion assembly and the second oil dispersion assembly can be infinitely adjusted to meet the total cooling power requirement and achieve thermal balance of the hydraulic oil system.

[0057] The following is based on Figure 1-3 The illustrated heat dissipation device embodiment illustrates the heat dissipation control method according to the present invention.

[0058] The heat dissipation control method according to the present invention comprises the following steps:

[0059] Information collection step S101: The information collection unit collects the following data information: ambient temperature and altitude of the environment where the engineering machinery is located, load factor of the engineering machinery, and hydraulic oil temperature in the hydraulic oil tank;

[0060] Calculation and allocation step S102: based on the collected data information, calculating the total cooling power requirement value of the heat dissipation device and the cooling power requirement values ​​allocated to the first oil heat sink assembly and the second oil heat sink assembly;

[0061] Control and adjust step S103: controlling the fan speed and / or the radiator oil side flow rate of the first oil dissipation assembly and / or the second oil dissipation assembly based on the allocated cooling power demand value.

[0062] exist Figure 4 In the illustrated embodiment, the calculation allocation step includes: comparing the total cooling power demand value with the maximum cooling power design value of the first oil radiator assembly, if the total cooling power demand value is less than or equal to the maximum cooling power design value of the first oil radiator assembly, then setting the cooling power demand value allocated to the second oil radiator assembly (auxiliary radiator) to zero, if the total cooling power demand value is greater than the maximum cooling power design value of the first oil radiator assembly, then judging to enable the second oil radiator assembly. In this allocation situation, the first radiator operates as a main radiator and the second radiator operates as an auxiliary radiator.

[0063] That is to say, when the heat dissipation capacity of the first oil dissipation assembly meets the required cooling power, it is sufficient to operate and control the first oil dissipation assembly alone without starting the second oil dissipation assembly. For example, when the excavator is operating at low altitude and low ambient temperature and low load conditions, if the original first oil dissipation assembly provides sufficient cooling power, the current provided to the second fan can be reduced by the controller to reduce the cooling capacity of the second oil dissipation assembly until the second oil dissipation assembly is shut down. When the heat dissipation demand of the hydraulic oil system exceeds the designed heat dissipation capacity of the first oil dissipation assembly, the second oil dissipation assembly is started to supplement the cooling power.

[0064] In an advantageous embodiment, in the calculation and allocation step, if the total cooling power requirement value is greater than the maximum cooling power design value of the first oil heat sink assembly, the difference between the total cooling power requirement value and the maximum cooling power design value of the first oil heat sink assembly is calculated, and a cooling power requirement value equal to the calculated difference is allocated to the second oil heat sink assembly. In this allocation case, the second heat sink as an auxiliary heat sink supplements the lack of cooling power so that the total cooling power of the entire heat sink device meets the requirement.

[0065] In another embodiment of the present invention, when the operator predicts that the cooling power of the heat dissipation device is insufficient according to the state parameters displayed on the display screen, the operator can operate the input control interface (touch control button) of the display screen to input an instruction to enable the second oil dissipation component. In the calculation allocation step, in response to the input instruction of the external forced activation of the second oil dissipation component, the total cooling power demand is allocated to both the first oil dissipation component and the second oil dissipation component according to a predetermined quota. The allocation quota can be reasonably set based on the designed heat dissipation capacity of the first oil dissipation component and the second oil dissipation component to ensure that both radiators can operate normally. Therefore, in the following control and adjustment step, the fan speeds of the first fan and the second fan and / or the radiator oil side flow of the first radiator and the second radiator are respectively controlled according to the allocated cooling power demand value. Therefore, the heat dissipation control method according to the present invention makes it possible to make full use of the rich experience of the driver or operator to make a prediction and the real-time control characteristics of the controller, and ensure that the heat dissipation device provides sufficient cooling power to meet the system requirements even in the case of a misjudgment or failure of the controller.

[0066] In the illustrated embodiment, the oil side flow of the corresponding radiator is controlled by controlling the first speed regulating valve and / or the second speed regulating valve disposed in the hydraulic oil heat dissipation pipeline where the first radiator and / or the second radiator are located. It is understood that the first speed regulating valve may be disposed only in the first hydraulic oil heat dissipation pipeline where the first radiator is located, or the second speed regulating valve may be disposed only in the second hydraulic oil heat dissipation pipeline where the second radiator is located.

[0067] In the heat dissipation control method according to the present invention, the controller adjusts the speed of the first fan and the second fan and the speed regulating valve opening (and the radiator oil side flow) by adjusting the control current provided to the first fan wire interface, the second fan wire interface, the first speed regulating valve and the second speed regulating valve. With this control method, the adjustment control of the fan speed and the radiator oil side flow can be continuous stepless adjustment, so the stepless adjustment of the cooling power of the heat dissipation device can also be achieved. Even when the first oil radiator assembly and the second oil radiator assembly use fans with non-adjustable speeds, the controller can also achieve stepless adjustment of the heat dissipation capacity of the heat dissipation device under different environmental and load conditions by directly adjusting the first speed regulating valve or the second speed regulating valve. Alternatively, when the first radiator and the second radiator are not equipped with speed regulating valves, the controller can also meet the cooling power required for hydraulic system cooling by adjusting the speed of the first fan or the second fan. Therefore, the heat dissipation control method can be flexibly and conveniently implemented on different heat dissipation devices to achieve stepless adjustment of the cooling power of the heat dissipation device to meet the requirements of different environmental conditions and load conditions.

[0068] In addition, the present invention provides a computer-readable storage medium on which a computer program is stored. The computer program includes executable instructions. When the executable instructions are executed by a controller, the heat dissipation control method of the present invention is implemented.

[0069] It should be noted that, although the second oil radiator assembly is shown as a single radiator assembly in the present application, it is understandable that the second oil radiator assembly may also include a plurality of heat exchangers arranged in series or in parallel.

[0070] Industrial Applicability

[0071] In order to facilitate the understanding of the present invention, the heat dissipation device and the heat dissipation control method of the present invention are described below.

[0072] Working principle:

[0073] See also Figure 1 and Figure 4 As shown, the maximum heat dissipation capacity (cooling power) CT required under the maximum load and extreme conditions (100% LF, 4500m above sea level, ambient temperature 45°C, etc.) is calculated based on the pump pressure flow (control current) of the hydraulic pump. The maximum cooling power design value of the first oil heat dissipation component can be determined as C1 according to the main working conditions of the excavator (for example, corresponding to the load factor LF <= 60%, plain and below 3000m above sea level, ambient temperature 35°C, etc.). The maximum cooling power design value of the second oil heat dissipation component is C2 = CT-C1. The heat dissipation control method according to the present invention allows the cooling power of the heat dissipation device to be infinitely adjusted within the range of 0 to CT according to different working conditions to avoid overheating or overcooling of the machine and meet the needs of actual operations.

[0074] Specifically, in delicate operations or operations with light loads, such as slope repair, ground leveling, and excavator idle operation, the first oil dispersion component operates alone, and the second oil dispersion component is not enabled. The speed of the first fan can be set to a low speed or off accordingly, and the oil side flow of the first radiator can also be selectively adjusted to ensure mechanical efficiency and save energy and fuel. In this case, the adjustment range of the cooling power of the heat dissipation device is 0 to C1.

[0075] When the machine is operating at high altitude and high ambient temperature with high load technology, the controller calculates the total cooling power demand value of the heat dissipation device based on the data information received from the information acquisition unit, compares the total cooling power demand value with the maximum cooling power design value of the first oil dissipation component, and determines whether to turn on the second oil dissipation component based on the comparison result. When the second oil dissipation component is turned on, the adjustment range of the cooling power of the entire heat dissipation device is C1~CT. Similarly, this adjustment can be achieved in a stepless adjustment manner by controlling the fan speed and / or the radiator oil side flow.

[0076] Therefore, the present invention provides a heat dissipation device whose cooling power can be infinitely adjusted in the range of 0 to CT. By using the first oil dissipation component and the second oil dissipation component in combination, it is achieved that the excavator has a reasonable adjustable heat dissipation capacity when working under different environmental conditions and load conditions. After sensing the changes in the environment (altitude, hydraulic oil temperature, etc.) and load condition parameters, the engine control module (ECM) adjusts the variable fan speed, return oil circuit shunt flow, etc. through electronic control methods to achieve infinite adjustment of the heat dissipation capacity, but with improved control sensitivity, timeliness and accuracy. The heat dissipation equipment and engineering machinery of the present invention are easier to use and promote, and can be used in extreme application scenarios such as high altitude areas, harsh working conditions, and high-load operation modes.

[0077] The above merely describes exemplary embodiments of the heat dissipation device and engineering machinery according to the present invention. The structure / configuration of the engineering machinery is not limited to the specific embodiments described herein, but rather, each component may be used independently and individually relative to other components described herein. "An example", "another example", "example", etc. mentioned throughout the specification means that a certain element / element (such as a feature, structure and / or characteristic) related to the example is included in at least one example described herein and may and / or may not appear in other examples. In addition, it will be understood that multiple elements of any example described may be combined in any suitable manner in multiple different examples, unless the context clearly indicates otherwise.

[0078] This specification uses examples to disclose the present invention, including the best embodiment, and enables any person skilled in the art to implement the present invention. The patentable scope of the present invention is defined by the claims, and may include other examples that may occur to those skilled in the art. If these other examples have structural elements that are not distinguished from the literal language of the claims, or if these other examples include structural elements that are not substantially distinguished from the literal language of the claims, then these other examples should fall within the scope of the claims.

Claims

1. A heat dissipation device (10) for an engineering machine, the heat dissipation device comprising a first oil dissipation assembly (11), the first oil dissipation assembly (11) comprising a first radiator (110) and a first fan (111), the first radiator (110) being configured to cool a first hydraulic oil flow flowing therein by means of an airflow generated by the first fan, characterized in that: The heat dissipation device also includes: A second oil dissipation assembly (12), the second oil dissipation assembly (12) comprising a second radiator (120) and a second fan (121), the second radiator being configured to cool a second hydraulic oil flow flowing therein by means of an airflow generated by the second fan, wherein a first hydraulic oil heat dissipation pipeline where the first hydraulic oil flow is located and a second hydraulic oil heat dissipation pipeline where the second hydraulic oil flow is located are connected in parallel, and are fluidically connected to a hydraulic oil tank of the engineering machinery at their downstream ends; An information collection unit (19) is used to collect the following data information: ambient temperature and altitude representing the environment in which the engineering machinery is located, a load factor representing the load condition of the engineering machinery, and a hydraulic oil temperature in a hydraulic oil tank; and A controller (13), the controller being connected to the information acquisition unit, the first fan and the second fan respectively, the controller being configured to receive data information from the information acquisition unit, calculate a total cooling power requirement value of the heat dissipation device and cooling power requirement values ​​allocated to the first oil dissipation component (11) and the second oil dissipation component (12) based on the received data information, and control a fan speed and / or a radiator oil side flow rate of the first oil dissipation component and / or the second oil dissipation component based on the allocated cooling power requirement values ​​so that the hydraulic oil temperature reaches a preset hydraulic oil thermal equilibrium temperature.

2. The heat dissipation device according to claim 1, characterized in that: A first speed regulating valve (11a) is provided in the first hydraulic oil heat dissipation pipeline upstream of the first radiator, and the controller (13) is connected to the first speed regulating valve to control the first speed regulating valve to adjust the flow rate of the hydraulic oil entering the first radiator.

3. The heat dissipation device according to claim 1 or 2, characterized in that: A second speed regulating valve (12a) is provided in the second hydraulic oil heat dissipation pipeline upstream of the second radiator, and the controller (13) is connected to the second speed regulating valve to control the second speed regulating valve to adjust the flow rate of the hydraulic oil entering the second radiator.

4. The heat dissipation device according to any one of claims 1 to 3, characterized in that: The first hydraulic oil heat dissipation pipeline and the second hydraulic oil heat dissipation pipeline are combined at the upstream connection part thereof, and an oil return back pressure valve and a hydraulic valve are arranged in the upstream oil circuit of the connection part. The oil return back pressure valve is connected to the oil return output end of the hydraulic valve, and the oil inlet input end of the hydraulic valve is connected to the hydraulic pump.

5. The heat dissipation device according to claim 4, characterized in that: The hydraulic valve is connected to a hydraulic cylinder or a hydraulic motor to drive the hydraulic cylinder or the hydraulic motor with the aid of hydraulic oil; and / or the hydraulic pump is connected to an engine output shaft; and / or an oil return bypass valve (18) is provided in an oil circuit connecting an oil return output end of the hydraulic valve and a hydraulic oil tank.

6. The heat dissipation device according to any one of claims 1 to 5, characterized in that: The engineering machinery includes a cooling package, which includes at least one of an engine coolant radiator, an air-to-air intercooler, an air-conditioning condenser, and a first radiator. The first radiator is a main radiator, and the second radiator is an auxiliary radiator arranged outside the cooling package.

7. The heat dissipation device according to claim 6, characterized in that: The first fan is a direct drive fan, an electric drive fan or a silicone oil clutch fan.

8. The heat dissipation device according to claim 6 or 7, characterized in that: The second fan is an electrically driven fan, a hydraulic motor driven fan or a torque converter driven fan.

9. An engineering machine (1), comprising a hydraulic oil tank and a heat dissipation device (10) fluidically connected to the hydraulic oil tank, characterized in that: The heat dissipation device is the heat dissipation device according to any one of claims 1 to 8.

10. The construction machine according to claim 9, characterized in that: The engineering machinery includes a cooling package, which includes at least one of an engine coolant radiator, an air-to-air intercooler, an air-conditioning condenser and the first radiator, and the second radiator is arranged between the cooling package and the cab or in an area close to a hydraulic oil tank or a fuel tank.

11. The construction machine according to claim 9 or 10, characterized in that: A display screen (SC) electrically connected to the controller is provided in the cab of the engineering machine, and the display screen is configured to display at least the altitude, the ambient temperature, the hydraulic oil temperature and the load factor.

12. The construction machine according to claim 11, characterized in that: The display screen also includes an input control interface for transmitting control instructions received from an operator to the controller.

13. A heat dissipation control method performed by the heat dissipation device according to any one of claims 1 to 8, comprising the following steps: Information collection step: The information collection unit collects the following data information: ambient temperature and altitude representing the environment in which the construction machinery is located, load factor of the construction machinery, and hydraulic oil temperature in the hydraulic oil tank; Calculation and allocation step: based on the collected data information, calculating the total cooling power demand value of the heat dissipation device and the cooling power demand values ​​allocated to the first oil dissipation component (11) and the second oil dissipation component (12); Control and adjust step: controlling the fan speed and / or the oil-side flow rate of the first oil dissipation assembly and / or the second oil dissipation assembly based on the allocated cooling power demand value.

14. The heat dissipation control method according to claim 13, characterized in that: In the calculation and allocation step, the total cooling power demand value is compared with the maximum cooling power design value of the first oil diffuser assembly. If the total cooling power demand value is less than or equal to the maximum cooling power design value of the first oil diffuser assembly, the cooling power demand value allocated to the second oil diffuser assembly is set to zero. If the total cooling power demand value is greater than the maximum cooling power design value of the first oil diffuser assembly, it is determined to enable the second oil diffuser assembly.

15. The heat dissipation control method according to claim 14, characterized in that: In the calculation and allocation step, if the total cooling power requirement value is greater than the maximum cooling power design value of the first oil diffuser assembly, the difference between the total cooling power requirement value and the maximum cooling power design value of the first oil diffuser assembly is calculated, and a cooling power requirement value equal to the calculated difference is allocated to the second oil diffuser assembly.

16. The heat dissipation control method according to claim 13, characterized in that: In the calculation allocation step, in response to an external input instruction for forcibly enabling the second heat sink, the total cooling power demand is allocated to both the first heat sink and the second heat sink according to a predetermined quota. In the control and adjustment step, the fan speeds of the first fan and the second fan and / or the radiator oil-side flows of the first radiator and the second radiator are respectively controlled according to the allocated cooling power demand values.

17. The heat dissipation control method according to any one of claims 13 to 16, characterized in that: The control and adjustment step includes controlling the oil side flow of the corresponding radiator by controlling the first speed regulating valve and / or the second speed regulating valve arranged in the hydraulic oil heat dissipation pipeline where the first radiator and / or the second radiator are located.

18. A computer-readable storage medium having a computer program stored thereon, the computer program comprising executable instructions, and when the executable instructions are executed by a controller (13), the heat dissipation control method according to any one of claims 13 to 17 is implemented.

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