Heat dissipation control method and system of electric loader

Abstract

The invention discloses a heat dissipation control method and system of an electric loader, and belongs to the technical field of heat dissipation of the electric loader. A heat dissipation control strategy is redesigned by introducing the temperature of motor anti-freezing liquid and utilizing the characteristic of the specific heat capacity of a heat dissipation medium; the judgment condition of starting and stopping of the fan is improved from single motor internal temperature judgment to motor anti-freezing solution temperature and motor internal temperature judgment, the specific heat capacity of the motor anti-freezing solution is far larger than that of metal, temperature change is slow and stable, temperature sudden change caused by special working conditions is avoided, and the service life of the fan is prolonged. Therefore, the situation that the fan rotates unstably due to sudden temperature change is avoided, the stability of the heat dissipation process is improved, the power consumption of the heat dissipation process is reduced, heat dissipation control is conducted through any one of the three methods, the method can adapt to most of the electric loaders, and the universality is greatly improved.

Description

Technical Field

[0001] The invention relates to a heat dissipation control method and system for an electric loader, belonging to the technical field of heat dissipation of electric loaders. Background Art

[0002] The motor system, hydraulic system and battery system of the electric loader will generate a lot of heat when working. If they are not cooled down in time, it will affect the normal operation of the electric loader. Therefore, a cooling system is needed to discharge this heat. At present, the cooling method of the electric loader is to judge the start and stop and speed of the cooling system fan according to the internal temperature of the motor, the temperature of the hydraulic oil or the temperature of the battery. However, the internal temperature of the motor changes rapidly and the temperature fluctuation is large, so the stability of the cooling process is poor. In addition, the existing technology often uses a single radiator to dissipate heat for a certain unit, which has low adaptability. Summary of the invention

[0003] The object of the present invention is to provide a heat dissipation control method and system for an electric loader, so as to solve the problems of poor stability and low adaptability existing in the prior art.

[0004] To achieve the above objectives, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a heat dissipation control method for an electric loader, comprising: The motor antifreeze temperature, motor internal temperature, hydraulic oil temperature and battery temperature of the electric loader are obtained. Based on the obtained temperatures, the heat dissipation of the electric loader is controlled by any of the following three methods: Method 1: According to the comparison result between the motor antifreeze temperature and the corresponding threshold value, and the comparison result between the motor internal temperature and the corresponding threshold value, the motor radiator fan is controlled to control the heat dissipation of the motor; according to the comparison result between the hydraulic oil temperature and the corresponding threshold value, the hydraulic oil radiator fan is controlled to control the heat dissipation of the hydraulic oil; according to the comparison result between the battery temperature and the corresponding threshold value, the battery radiator fan is controlled to control the heat dissipation of the battery; Method 2: Based on the comparison result between the maximum value of the motor antifreeze temperature and the hydraulic oil temperature and the corresponding threshold value, and the comparison result between the motor internal temperature and the corresponding threshold value, the composite radiator I fan is controlled to control the heat dissipation of the motor and the hydraulic oil; based on the comparison result between the battery temperature and the corresponding threshold value, the battery radiator fan is controlled to control the heat dissipation of the battery; Method 3: Based on the comparison results of the maximum values ​​of the motor antifreeze temperature, hydraulic oil temperature and battery temperature with the corresponding thresholds, and the comparison results of the internal temperature of the motor with the corresponding thresholds, the composite radiator II fan is controlled to control the heat dissipation of the motor, hydraulic oil and battery.

[0005] Further, the motor radiator fan is controlled to perform heat dissipation control on the motor according to the comparison result of the motor antifreeze liquid temperature and the corresponding threshold value, and the comparison result of the motor internal temperature and the corresponding threshold value, including: If the motor antifreeze temperature is greater than the first antifreeze temperature threshold, the motor radiator fan is controlled to start rotating; If the motor antifreeze temperature is less than or equal to the first antifreeze temperature threshold, and the motor internal temperature is less than or equal to the first motor internal temperature threshold, the motor radiator fan is controlled to start rotating; If the motor antifreeze temperature is ≤ the first antifreeze temperature threshold, and the motor internal temperature is > the first motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within a preset time, the motor radiator fan is controlled to start rotating; If the motor antifreeze temperature is ≤ the first antifreeze temperature threshold, and the motor internal temperature is > the first motor internal temperature threshold, and the motor internal temperature drops to the first motor internal temperature threshold within a preset time / has a trend of dropping to the first motor internal temperature threshold, the motor radiator fan is controlled not to rotate.

[0006] Further, the motor radiator fan is controlled to perform heat dissipation control on the motor according to the comparison result of the motor antifreeze liquid temperature and the corresponding threshold value, and the comparison result of the motor internal temperature and the corresponding threshold value, and further includes: In response to detecting that the motor radiator fan starts to rotate, the following control strategy is executed: If the motor antifreeze temperature is greater than the second antifreeze temperature threshold, the motor radiator fan is controlled to rotate at the maximum speed; If the motor antifreeze temperature is less than or equal to the second antifreeze temperature threshold, and the motor internal temperature is less than or equal to the second motor internal temperature threshold, the motor radiator fan is controlled to rotate at the maximum speed; If the motor antifreeze temperature is ≤ the second antifreeze temperature threshold, and the motor internal temperature is > the second motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within a preset time, the motor radiator fan is controlled to rotate at the maximum speed; If the motor antifreeze temperature is ≤ the second antifreeze temperature threshold, and the motor internal temperature is > the second motor internal temperature threshold, and the motor internal temperature drops to the second motor internal temperature threshold within a preset time / has a trend of dropping to the second motor internal temperature threshold, the motor radiator fan is controlled to stop rotating.

[0007] Further, the controlling of the hydraulic oil radiator fan according to the comparison result between the hydraulic oil temperature and the corresponding threshold value to control the heat dissipation of the hydraulic oil includes: If the hydraulic oil temperature is greater than the first hydraulic oil temperature threshold, the hydraulic oil radiator fan is controlled to start rotating; In response to detecting that the hydraulic oil radiator fan starts to rotate, the following control strategy is executed: if the hydraulic oil temperature is greater than the second hydraulic oil temperature threshold, the hydraulic oil radiator fan is controlled to rotate at a maximum speed.

[0008] Further, the battery radiator fan is controlled according to the comparison result between the battery temperature and the corresponding threshold value to control the heat dissipation of the battery, including: If the battery temperature is greater than the first battery temperature threshold, the battery radiator fan is controlled to start rotating; In response to detecting that the battery radiator fan starts to rotate, the following control strategy is executed: if the battery temperature is greater than the second battery temperature threshold, the battery radiator fan is controlled to rotate at a maximum speed.

[0009] Further, the control of the composite radiator I fan to perform heat dissipation control on the motor and the hydraulic oil according to the comparison result of the maximum value of the motor antifreeze temperature and the hydraulic oil temperature with the corresponding threshold value, and the comparison result of the motor internal temperature with the corresponding threshold value, includes: If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is greater than the first composite threshold, the composite radiator I fan is controlled to start rotating; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the first composite threshold, and the motor internal temperature is ≤ the first motor internal temperature threshold, the composite radiator I fan is controlled to start rotating; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the first composite threshold, and the motor internal temperature is > the first motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator I fan is controlled to start rotating; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the first composite threshold, and the motor internal temperature is greater than the first motor internal temperature threshold, and the motor internal temperature drops to the first motor internal temperature threshold within the preset time / has a trend of dropping to the first motor internal temperature threshold, the composite radiator I fan is controlled not to rotate.

[0010] Further, the control of the composite radiator I fan to perform heat dissipation control on the motor and the hydraulic oil according to the comparison result of the maximum value of the motor antifreeze temperature and the hydraulic oil temperature with the corresponding threshold value, and the comparison result of the motor internal temperature with the corresponding threshold value, also includes: In response to detecting that the fan of the composite radiator I starts to rotate, the following control strategy is executed: If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is greater than the second composite threshold, the composite radiator I fan is controlled to rotate at the maximum speed; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the second composite threshold value, and the motor internal temperature is ≤ the second motor internal temperature threshold value, the composite radiator I fan is controlled to rotate at the maximum speed; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the second composite threshold, and the motor internal temperature is > the second motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator I fan is controlled to rotate at the maximum speed; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the second composite threshold, and the motor internal temperature is greater than the second motor internal temperature threshold, and the motor internal temperature drops to the second motor internal temperature threshold within the preset time / has a trend of dropping to the second motor internal temperature threshold, the composite radiator I fan is controlled to stop rotating.

[0011] Further, the control of the composite radiator II fan to perform heat dissipation control on the motor, hydraulic oil and battery according to the comparison result of the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature with the corresponding threshold value, and the comparison result of the motor internal temperature with the corresponding threshold value, includes: If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is greater than the third composite threshold, the composite radiator II fan is controlled to start rotating; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the third composite threshold value, and the motor internal temperature is ≤ the first motor internal temperature threshold value, the composite radiator II fan is controlled to start rotating; If the maximum value among the motor antifreeze temperature, hydraulic oil temperature and battery temperature is ≤ the third composite threshold value, and the motor internal temperature is > the first motor internal temperature threshold value, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator II fan is controlled to start rotating; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the third composite threshold, and the motor internal temperature is greater than the first motor internal temperature threshold, and the motor internal temperature drops to the first motor internal temperature threshold within the preset time / has a trend of dropping to the first motor internal temperature threshold, the composite radiator II fan is controlled not to rotate.

[0012] Further, the control of the composite radiator II fan to perform heat dissipation control on the motor, hydraulic oil and battery according to the comparison result of the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature with the corresponding threshold value, and the comparison result of the motor internal temperature with the corresponding threshold value, also includes: In response to detecting that the composite radiator II fan starts to rotate, the following control strategy is executed: If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is greater than the fourth composite threshold, the composite radiator II fan is controlled to rotate at the maximum speed; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the fourth composite threshold value, and the motor internal temperature is ≤ the second motor internal temperature threshold value, the composite radiator II fan is controlled to rotate at the maximum speed; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the fourth composite threshold value, and the motor internal temperature is > the second motor internal temperature threshold value, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator II fan is controlled to rotate at the maximum speed; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the fourth composite threshold, and the motor internal temperature is greater than the second motor internal temperature threshold, and the motor internal temperature drops to the second motor internal temperature threshold within the preset time / has a trend of dropping to the second motor internal temperature threshold, the composite radiator II fan is controlled to stop rotating.

[0013] In a second aspect, the present invention provides a heat dissipation control system for an electric loader, comprising a temperature acquisition unit, a control unit, a motor radiator, a hydraulic oil radiator, a battery radiator, a composite radiator I and a composite radiator II, wherein the temperature acquisition unit is connected to the motor, the hydraulic oil and the battery, respectively, and is used to collect the motor antifreeze temperature, the motor internal temperature, the hydraulic oil temperature and the battery temperature of the electric loader and send them to the control unit, and the control unit executes any one of the methods described in the first aspect according to the acquired temperatures, and controls the fans in the motor radiator, the hydraulic oil radiator, the battery radiator, the composite radiator I and the composite radiator II.

[0014] Compared with the prior art, the beneficial effects achieved by the present invention are: The present invention provides a heat dissipation control method and system for an electric loader. By referring to the temperature of the motor antifreeze liquid and utilizing the characteristics of the specific heat capacity of the heat dissipation medium, the judgment condition for starting and stopping the fan is improved from judging the single internal temperature of the motor to judging the temperature of the motor antifreeze liquid and the internal temperature of the motor. Since the specific heat capacity of the motor antifreeze liquid is much greater than the specific heat capacity of the metal, the temperature changes slowly and steadily, avoiding the sudden change of temperature caused by special working conditions, thereby avoiding the unstable rotation of the fan caused by the sudden change of temperature, improving the stability of the heat dissipation process, and reducing the power consumption of the heat dissipation process. By performing heat dissipation control by any one of the three methods, the system can adapt to most electric loaders, and the versatility is greatly improved. Moreover, stable fan rotation can also increase the service life of the fan. At the same time, the temperature difference between the internal temperature of the motor and the temperature of the motor antifreeze can be used to determine whether the cooling system has a fault, further improving the safety of the cooling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1is a flow chart of a heat dissipation control method for an electric loader provided by an embodiment of the present invention; Figure 2 is a flowchart corresponding to the method 1 provided in the embodiment of the present invention; Figure 3 is a flowchart corresponding to the second method provided in an embodiment of the present invention; Figure 4 It is a flowchart corresponding to method three provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the protection scope of the present invention.

[0017] Example 1.

[0018] like Figure 1 As shown, the present invention provides a heat dissipation control method for an electric loader, comprising the following steps: The motor antifreeze temperature, motor internal temperature, hydraulic oil temperature and battery temperature of the electric loader are obtained. Based on the obtained temperatures, the heat dissipation of the electric loader is controlled by any of the following three methods: Method 1: According to the comparison result between the motor antifreeze temperature and the corresponding threshold value, and the comparison result between the motor internal temperature and the corresponding threshold value, the motor radiator fan is controlled to control the heat dissipation of the motor; according to the comparison result between the hydraulic oil temperature and the corresponding threshold value, the hydraulic oil radiator fan is controlled to control the heat dissipation of the hydraulic oil; according to the comparison result between the battery temperature and the corresponding threshold value, the battery radiator fan is controlled to control the heat dissipation of the battery; Method 2: Based on the comparison result between the maximum value of the motor antifreeze temperature and the hydraulic oil temperature and the corresponding threshold value, and the comparison result between the motor internal temperature and the corresponding threshold value, the composite radiator I fan is controlled to control the heat dissipation of the motor and the hydraulic oil; based on the comparison result between the battery temperature and the corresponding threshold value, the battery radiator fan is controlled to control the heat dissipation of the battery; Method 3: Based on the comparison results of the maximum values ​​of the motor antifreeze temperature, hydraulic oil temperature and battery temperature with the corresponding thresholds, and the comparison results of the internal temperature of the motor with the corresponding thresholds, the composite radiator II fan is controlled to control the heat dissipation of the motor, hydraulic oil and battery.

[0019] The present invention refers to the temperature of the motor antifreeze liquid and utilizes the characteristics of the specific heat capacity of the heat dissipation medium to improve the judgment condition for starting and stopping the fan from judging the single internal temperature of the motor to judging the motor antifreeze liquid temperature and the internal temperature of the motor. Since the specific heat capacity of the motor antifreeze liquid is much larger than the specific heat capacity of the metal, the temperature changes slowly and steadily, thus avoiding the sudden temperature change caused by special working conditions, and further avoiding the unstable rotation of the fan caused by the sudden temperature change, improving the stability of the heat dissipation process, and reducing the power consumption of the heat dissipation process. By performing heat dissipation control through any one of the three methods, the present invention can adapt to the vast majority of electric loaders, and the versatility is greatly improved.

[0020] Example 2.

[0021] like Figure 1 As shown, the present invention provides a heat dissipation control method for an electric loader, comprising the following steps: Get the motor antifreeze temperature, motor internal temperature, hydraulic oil temperature and battery temperature of the electric loader. Based on the obtained temperatures, use the following three methods (such as Figure 2 The method shown is as follows: Figure 3 Method 2 and Figure 4 Any one of the methods 3) shown in the figure is used to control the heat dissipation of the electric loader.

[0022] like Figure 2 As shown, method one is the first heat dissipation control method of the electric loader. In the first heat dissipation control method, the travel motor and the hydraulic motor are independently cooled by the first group of radiators (motor radiators), the hydraulic system is independently cooled by the second group of radiators (hydraulic oil radiators), and the battery pack is independently cooled by the third group of radiators (battery radiators).

[0023] When the electric loader starts working, the temperature sensor installed in the heat dissipation pipeline of the motor heat dissipation system measures the temperature T of the motor antifreeze in real time. a The temperature sensor installed inside the motor measures the temperature T inside the motor in real time. e , because the function of the motor antifreeze is to discharge the heat from the motor through the motor radiator, so theoretically T a ≤T e , T a With T e The numerical relationship between the two can be determined through experiments (for example, when the cooling system is working normally, when T e When it is 70℃, T a It should be 65℃-68℃). As the operating time of the electric loader increases and the intensity of the operation increases, the internal temperature of the motor and the hydraulic oil temperature gradually rise.

[0024] like Figure 2 As shown, if the temperature of the motor antifreeze fluid is Ta Greater than or equal to the first antifreeze temperature threshold T a1 When the motor temperature is too high, it needs to be cooled, and the motor radiator fan starts to rotate; if T a <T a1 When the motor internal temperature T e The first motor internal temperature threshold T e1 (This step is equivalent to an insurance, because if the cooling system fails and T a and T e If the difference between the values ​​is too large, T e The temperature has already exceeded the corresponding threshold, but the radiator has not yet started working). If the internal temperature of the motor T e Greater than T e1 , further determination is required.

[0025] like Figure 2 As shown, if T e Drop to T within t time e1 Below or down to T e1 The following trend indicates that the internal temperature of the motor suddenly rises at this time, which is a sudden change in the motor temperature (for example, when the loader starts to shovel, due to the heavy weight of the shovel, the angle of the bucket and the boom is not adjusted to the appropriate position, resulting in the inability to lift the boom. Therefore, the instantaneous torque of the hydraulic motor increases, and the temperature of the hydraulic motor will increase. However, when the driver adjusts the angle of the boom and the bucket through the joystick, the boom can be lifted normally, and the motor torque returns to normal, and the temperature will drop. Or when the motor encounters an uphill or muddy road, the motor torque or speed suddenly increases in a short period of time, causing the motor temperature to rise. These situations will cause the motor temperature to suddenly change. If the internal temperature of the motor is used as the judgment condition, the motor radiator fan may stop and start, affecting the stability of the cooling system, increasing the power consumption of the radiator, and reducing the service life of the cooling fan). The starting condition of the motor radiator fan still depends on T a and T a1 The relationship between , at this time the motor radiator fan does not rotate; if T e If the temperature remains unchanged or rises during time t (that is, the temperature inside the motor does not show a downward trend), it means that the increase in the temperature inside the motor is not due to a sudden change, but due to some problem in the cooling system that may cause T a and T e The difference is too large, so the fan start condition of the cooling system is changed to T e With T e1 The temperature relationship between them is such that the motor radiator fan starts to rotate at this time.

[0026] The specific heat capacity of antifreeze is much larger than that of metal, that is, when absorbing the same amount of heat, the temperature of antifreeze rises more slowly and the temperature of metal rises faster. Therefore, the internal temperature of the motor is much more affected by temperature changes than the antifreeze temperature. Therefore, when encountering temperature changes, the temperature change of antifreeze is more stable. Therefore, using the antifreeze temperature as the judgment condition for the motor radiator fan control makes the cooling system more stable.

[0027] like Figure 2 As shown, when the motor antifreeze temperature T a Greater than the second antifreeze temperature threshold T a2 At this time, the motor has reached the limit temperature. If the temperature continues to rise, the motor is at risk of damage. Therefore, the motor radiator fan is controlled to rotate at the maximum speed. The specific steps are the same as the above steps.

[0028] like Figure 2 As shown in the figure, the heat dissipation of hydraulic oil in method 1: when the hydraulic oil temperature T o Greater than the first hydraulic oil temperature threshold T o1 When the hydraulic oil radiator fan starts to rotate, if T o The temperature continues to rise and exceeds the second hydraulic oil temperature threshold T o2 When the hydraulic oil reaches the limit temperature, the hydraulic oil radiator fan is controlled to rotate at the maximum speed.

[0029] like Figure 2 As shown in the figure, in method 1, the heat dissipation of the battery is: if the battery temperature T b Greater than the first battery temperature threshold T b1 When the battery radiator fan starts to rotate, if T b Continue to rise to a temperature greater than the second battery temperature threshold T b2 When the battery reaches the limit temperature, the battery radiator fan is controlled to rotate at the maximum speed.

[0030] like Figure 3 As shown, method 2 is the second heat dissipation control method of the electric loader. In the second heat dissipation control method, the travel motor, hydraulic motor and hydraulic oil are cooled by the first group of radiators (composite radiator I), and the battery pack is independently cooled by the second group of radiators (battery radiators).

[0031] After the loader starts working, the temperature sensor measures the motor antifreeze temperature T in real time. a , hydraulic oil temperature T o and the motor internal temperature T e ,like Figure 3 As shown, if T a With T o The maximum value T h Greater than the first composite threshold T h1, then the fan of the composite radiator I is controlled to start rotating. If T h Less than T h1 It is necessary to further determine the internal temperature T of the motor e The first motor internal temperature threshold T e1 The relationship between (this step only needs to determine T e With T e1 The relationship between the motor and the hydraulic oil is not important, because the specific heat capacity of the hydraulic oil is smaller than that of the antifreeze, but it is much larger than that of the metal, so it is less affected by the temperature mutation. Therefore, there is no need to make a secondary judgment here). If the internal temperature of the motor T e Greater than T e1 , further determination is required.

[0032] like Figure 3 As shown, if T e Drop to T within t time e1 Below or down to T e1 The following trend indicates that the internal temperature of the motor suddenly rises, which is a sudden change in the motor temperature. The condition for starting the fan of the composite radiator I still depends on T h and T h1 The relationship between e If the temperature remains unchanged or rises (that is, there is no downward trend) within the time t, it means that the internal temperature of the motor is not increased due to a sudden change, but due to some problem in the cooling system that causes T a and T e The difference is too large, so the fan start condition of composite radiator I is changed to T e With T e1 The temperature relationship between them is such that the fan of the composite radiator I is controlled to start rotating at this time.

[0033] As the temperature rises further, when T h Greater than the second composite threshold T h2 At this time, the motor or hydraulic system has reached the limit temperature. If the temperature continues to rise, there is a risk of damage. Therefore, the fan of the composite radiator I is controlled to rotate at the maximum speed. The specific steps are the same as the above steps.

[0034] Regarding the heat dissipation of the battery in method 2: If the battery temperature T b Greater than the first battery temperature threshold T b1 When the battery radiator fan starts to rotate, if T b The temperature continues to rise to a value greater than the second battery temperature threshold T b2 When the battery reaches the limit temperature, the battery radiator fan is controlled to rotate at the maximum speed.

[0035] like Figure 4As shown, method three is the third heat dissipation control method of the electric loader. In the third heat dissipation control method, the travel motor, hydraulic motor, hydraulic oil and battery are cooled by the same set of radiators (composite radiator II).

[0036] like Figure 4 As shown in the figure, after the loader starts working, the temperature sensor measures the motor antifreeze temperature T in real time. a , hydraulic oil temperature T o and the motor internal temperature T e , if T a , T o and T b The maximum value T p is greater than the third composite threshold value Tp1, the composite radiator II fan is controlled to start rotating. p Less than T p1 It is necessary to further determine the internal temperature T of the motor e The first motor internal temperature threshold T e1 The relationship between (this step only needs to determine T e With T e1 The relationship between the hydraulic oil and the battery is not important, because the specific heat capacity of the hydraulic oil is smaller than that of the antifreeze, but it is much larger than that of the metal, so it is less affected by the temperature mutation. The battery pack temperature is much smaller than the motor mutation, so there is no need to make a secondary judgment here). If the internal temperature of the motor T e Greater than T e1 , further determination is required.

[0037] like Figure 4 As shown, if T e Drop to T within t time e1 Below or down to T e1 The following trend indicates that the internal temperature of the motor suddenly rises, which is a sudden change in the motor temperature. The starting condition of the composite radiator II fan still depends on T p and T p1 The relationship between e If the temperature remains unchanged or rises (that is, there is no downward trend) within the time t, it means that the internal temperature of the motor is not increased due to a sudden change, but due to some problem in the cooling system that causes T a and T e The difference is too large, so the fan start condition of the composite radiator II is changed to T e With T e1 The temperature relationship between them is such that the fan of the composite radiator II is controlled to start rotating.

[0038] like Figure 4 As shown, as the temperature rises further, when Tp Greater than the fourth composite threshold T p2 At this time, the motor or hydraulic system has reached the limit temperature. If the temperature continues to rise, there is a risk of damage. Therefore, the composite radiator II is controlled to rotate at the maximum speed. The specific steps are the same as the above steps.

[0039] Example 3.

[0040] The present invention provides a heat dissipation control system for an electric loader, comprising a temperature acquisition unit, a control unit, a motor radiator, a hydraulic oil radiator, a battery radiator, a composite radiator I and a composite radiator II. The temperature acquisition unit is connected to the motor, the hydraulic oil and the battery respectively, and is used to collect the motor antifreeze temperature, the motor internal temperature, the hydraulic oil temperature and the battery temperature of the electric loader and send them to the control unit. The control unit executes the method provided in Example 1 / Example 2 according to the acquired temperatures, and controls the fans in the motor radiator, the hydraulic oil radiator, the battery radiator, the composite radiator I and the composite radiator II.

[0041] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0042] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0043] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0044] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A heat dissipation control method for an electric loader, characterized in that: include: The motor antifreeze temperature, motor internal temperature, hydraulic oil temperature and battery temperature of the electric loader are obtained. Based on the obtained temperatures, the heat dissipation of the electric loader is controlled by any of the following three methods: Method 1: According to the comparison result between the motor antifreeze temperature and the corresponding threshold value, and the comparison result between the motor internal temperature and the corresponding threshold value, the motor radiator fan is controlled to control the heat dissipation of the motor; according to the comparison result between the hydraulic oil temperature and the corresponding threshold value, the hydraulic oil radiator fan is controlled to control the heat dissipation of the hydraulic oil; according to the comparison result between the battery temperature and the corresponding threshold value, the battery radiator fan is controlled to control the heat dissipation of the battery; Method 2: Based on the comparison result between the maximum value of the motor antifreeze temperature and the hydraulic oil temperature and the corresponding threshold value, and the comparison result between the motor internal temperature and the corresponding threshold value, the composite radiator I fan is controlled to control the heat dissipation of the motor and the hydraulic oil; based on the comparison result between the battery temperature and the corresponding threshold value, the battery radiator fan is controlled to control the heat dissipation of the battery; Method 3: Based on the comparison results of the maximum values ​​of the motor antifreeze temperature, hydraulic oil temperature and battery temperature with the corresponding thresholds, and the comparison results of the internal temperature of the motor with the corresponding thresholds, the composite radiator II fan is controlled to control the heat dissipation of the motor, hydraulic oil and battery.

2. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The method of controlling the motor radiator fan to perform heat dissipation control on the motor according to the comparison result of the motor antifreeze liquid temperature and the corresponding threshold value, and the comparison result of the motor internal temperature and the corresponding threshold value, comprises: If the motor antifreeze temperature is greater than the first antifreeze temperature threshold, the motor radiator fan is controlled to start rotating; If the motor antifreeze temperature is less than or equal to the first antifreeze temperature threshold, and the motor internal temperature is less than or equal to the first motor internal temperature threshold, the motor radiator fan is controlled to start rotating; If the motor antifreeze temperature is ≤ the first antifreeze temperature threshold, and the motor internal temperature is > the first motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within a preset time, the motor radiator fan is controlled to start rotating; If the motor antifreeze temperature is ≤ the first antifreeze temperature threshold, and the motor internal temperature is > the first motor internal temperature threshold, and the motor internal temperature drops to the first motor internal temperature threshold within a preset time / has a trend of dropping to the first motor internal temperature threshold, the motor radiator fan is controlled not to rotate.

3. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The method further comprises: controlling the motor radiator fan to perform heat dissipation control on the motor according to the comparison result between the motor antifreeze liquid temperature and the corresponding threshold value, and the comparison result between the motor internal temperature and the corresponding threshold value. In response to detecting that the motor radiator fan starts to rotate, the following control strategy is executed: If the motor antifreeze temperature is greater than the second antifreeze temperature threshold, the motor radiator fan is controlled to rotate at the maximum speed; If the motor antifreeze temperature is less than or equal to the second antifreeze temperature threshold, and the motor internal temperature is less than or equal to the second motor internal temperature threshold, the motor radiator fan is controlled to rotate at the maximum speed; If the motor antifreeze temperature is ≤ the second antifreeze temperature threshold, and the motor internal temperature is > the second motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within a preset time, the motor radiator fan is controlled to rotate at the maximum speed; If the motor antifreeze temperature is ≤ the second antifreeze temperature threshold, and the motor internal temperature is > the second motor internal temperature threshold, and the motor internal temperature drops to the second motor internal temperature threshold within a preset time / has a trend of dropping to the second motor internal temperature threshold, the motor radiator fan is controlled to stop rotating.

4. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The controlling of the hydraulic oil radiator fan according to the comparison result between the hydraulic oil temperature and the corresponding threshold value to perform heat dissipation control on the hydraulic oil includes: If the hydraulic oil temperature is greater than the first hydraulic oil temperature threshold, the hydraulic oil radiator fan is controlled to start rotating; In response to detecting that the hydraulic oil radiator fan starts to rotate, the following control strategy is executed: if the hydraulic oil temperature is greater than the second hydraulic oil temperature threshold, the hydraulic oil radiator fan is controlled to rotate at a maximum speed.

5. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The method of controlling the battery radiator fan according to the comparison result between the battery temperature and the corresponding threshold value to control the heat dissipation of the battery includes: If the battery temperature is greater than the first battery temperature threshold, the battery radiator fan is controlled to start rotating; In response to detecting that the battery radiator fan starts to rotate, the following control strategy is executed: if the battery temperature is greater than the second battery temperature threshold, the battery radiator fan is controlled to rotate at a maximum speed.

6. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The method controls the fan of the composite radiator I to perform heat dissipation control on the motor and the hydraulic oil according to the comparison result of the maximum value of the motor antifreeze temperature and the hydraulic oil temperature with the corresponding threshold value, and the comparison result of the internal temperature of the motor with the corresponding threshold value, including: If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is greater than the first composite threshold, the composite radiator I fan is controlled to start rotating; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the first composite threshold, and the motor internal temperature is ≤ the first motor internal temperature threshold, the composite radiator I fan is controlled to start rotating; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the first composite threshold, and the motor internal temperature is > the first motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator I fan is controlled to start rotating; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the first composite threshold, and the motor internal temperature is greater than the first motor internal temperature threshold, and the motor internal temperature drops to the first motor internal temperature threshold within the preset time / has a trend of dropping to the first motor internal temperature threshold, the composite radiator I fan is controlled not to rotate.

7. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The method controls the fan of the composite radiator I to perform heat dissipation control on the motor and the hydraulic oil according to the comparison result of the maximum value of the motor antifreeze liquid temperature and the hydraulic oil temperature with the corresponding threshold value, and the comparison result of the internal temperature of the motor with the corresponding threshold value, and further includes: In response to detecting that the fan of the composite radiator I starts to rotate, the following control strategy is executed: If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is greater than the second composite threshold, the composite radiator I fan is controlled to rotate at the maximum speed; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the second composite threshold value, and the motor internal temperature is ≤ the second motor internal temperature threshold value, the composite radiator I fan is controlled to rotate at the maximum speed; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the second composite threshold, and the motor internal temperature is > the second motor internal temperature threshold, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator I fan is controlled to rotate at the maximum speed; If the maximum value of the motor antifreeze temperature and the hydraulic oil temperature is ≤ the second composite threshold, and the motor internal temperature is greater than the second motor internal temperature threshold, and the motor internal temperature drops to the second motor internal temperature threshold within the preset time / has a trend of dropping to the second motor internal temperature threshold, the composite radiator I fan is controlled to stop rotating.

8. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The method controls the fan of the composite radiator II to perform heat dissipation control on the motor, hydraulic oil and battery according to the comparison result of the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature with the corresponding threshold value, and the comparison result of the internal temperature of the motor with the corresponding threshold value, including: If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is greater than the third composite threshold, the composite radiator II fan is controlled to start rotating; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the third composite threshold value, and the motor internal temperature is ≤ the first motor internal temperature threshold value, the composite radiator II fan is controlled to start rotating; If the maximum value among the motor antifreeze temperature, hydraulic oil temperature and battery temperature is ≤ the third composite threshold value, and the motor internal temperature is > the first motor internal temperature threshold value, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator II fan is controlled to start rotating; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the third composite threshold, and the motor internal temperature is greater than the first motor internal temperature threshold, and the motor internal temperature drops to the first motor internal temperature threshold within the preset time / has a trend of dropping to the first motor internal temperature threshold, the composite radiator II fan is controlled not to rotate.

9. The heat dissipation control method of an electric loader according to claim 1, characterized in that: The method further comprises: controlling the fan of the composite radiator II to perform heat dissipation control on the motor, the hydraulic oil and the battery according to the comparison result of the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature with the corresponding threshold value, and the comparison result of the internal temperature of the motor with the corresponding threshold value, and further comprising: In response to detecting that the composite radiator II fan starts to rotate, the following control strategy is executed: If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is greater than the fourth composite threshold, the composite radiator II fan is controlled to rotate at the maximum speed; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the fourth composite threshold value, and the motor internal temperature is ≤ the second motor internal temperature threshold value, the composite radiator II fan is controlled to rotate at the maximum speed; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the fourth composite threshold value, and the motor internal temperature is > the second motor internal temperature threshold value, and the motor internal temperature remains unchanged / increases within the preset time, the composite radiator II fan is controlled to rotate at the maximum speed; If the maximum value among the motor antifreeze temperature, the hydraulic oil temperature and the battery temperature is ≤ the fourth composite threshold, and the motor internal temperature is greater than the second motor internal temperature threshold, and the motor internal temperature drops to the second motor internal temperature threshold within the preset time / has a trend of dropping to the second motor internal temperature threshold, the composite radiator II fan is controlled to stop rotating.

10. A heat dissipation control system for an electric loader, characterized in that: It includes a temperature acquisition unit, a control unit, a motor radiator, a hydraulic oil radiator, a battery radiator, a composite radiator I and a composite radiator II. The temperature acquisition unit is connected to the motor, the hydraulic oil and the battery respectively, and is used to collect the motor antifreeze temperature, the motor internal temperature, the hydraulic oil temperature and the battery temperature of the electric loader and send them to the control unit. The control unit executes the method described in any one of claims 1 to 9 according to the acquired temperatures to control the fans in the motor radiator, the hydraulic oil radiator, the battery radiator, the composite radiator I and the composite radiator II.

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