Heat dissipation system of electric tractor

Abstract

The utility model relates to the technical field of electric tractors, in particular to a heat dissipation system of an electric tractor. The heat dissipation system of the electric tractor comprises a heat dissipation water tank, a motor, a battery and an electronic fan. The battery can supply power to the electronic fan, the rotating speed of the electronic fan can be adjusted, and the electronic fan can dissipate heat of cooling liquid in the heat dissipation water tank. Cooling liquid in the heat dissipation water tank can circularly flow through the battery and the motor so as to circularly dissipate heat of the battery and the motor. According to the heat dissipation system of the electric tractor, the problems that a cooling fan of a traditional tractor is mainly directly driven by an engine and is usually designed according to the requirement for the maximum heat dissipation amount, in other words, the rotating speed of the fan cannot be adjusted in real time according to the actual heat dissipation requirement, power consumption is large, and noise is large are solved.

Description

Technical Field

[0001] The present application relates to the technical field of electric tractors, and in particular to a heat dissipation system for an electric tractor. Background Art

[0002] Tractors are the main power machinery in agricultural production. Traditional diesel tractors have disadvantages such as high emission pollution and complex gearbox structure. Electric tractors, as the development direction of advanced agricultural machinery, have many advantages such as zero emission and stepless speed change. The motor and power battery of electric tractors are sensitive to temperature. Excessive temperature will damage the motor and power battery. Therefore, cooling fans are required as key components of the heat dissipation system to dissipate heat from the motor and power battery.

[0003] However, the working mode of traditional tractor cooling fans is mainly driven directly by the engine. Generally, the fan is driven by the front pulley of the engine according to a certain transmission ratio. The fan speed is in a speed ratio relationship with the engine speed. It is usually designed according to the maximum heat dissipation requirement. In this way, the fan speed cannot be adjusted in real time according to the actual heat dissipation demand, and has the disadvantages of high power consumption and high noise. Utility Model Content

[0004] The purpose of the present application is to provide an electric tractor heat dissipation system, thereby solving the problem that the traditional tractor cooling fan is mainly driven directly by the engine and is usually designed according to the maximum heat dissipation requirement. In this way, the fan speed cannot be adjusted in real time according to the actual heat dissipation requirement, resulting in high power consumption and high noise.

[0005] According to the present application, a heat dissipation system for an electric tractor is provided, which includes a heat dissipation water tank, a motor, a battery and an electronic fan; the battery can supply power to the electronic fan, the speed of the electronic fan can be adjusted, and the electronic fan can dissipate heat from the coolant in the heat dissipation water tank; the coolant in the heat dissipation water tank can circulate through the battery and the motor to circulate and dissipate heat from the battery and the motor.

[0006] In any of the above technical solutions, further, the electric tractor cooling system also includes a water inlet pipe and a water outlet pipe connected to the cooling water tank; the motor and the battery are arranged in parallel, the water inlets of the motor and the battery are connected to the water outlet pipe, and the water outlets of the motor and the battery are connected to the water inlet pipe.

[0007] In any of the above technical solutions, further, the electric tractor cooling system also includes an electronic water pump, which is arranged on the water outlet pipe; and the battery can supply power to the electronic water pump.

[0008] In any of the above technical solutions, further, the electric tractor cooling system also includes a DC voltage converter; the power of the battery is converted by the DC voltage converter to supply power to the electronic water pump and the electronic fan.

[0009] In any of the above technical solutions, further, the power of the battery is converted into 12V or 24V by the DC voltage converter to power the electronic fan and the electronic water pump.

[0010] In any of the above technical solutions, further, the electric tractor cooling system also includes a controller; the controller can control the electronic fan and the electronic water pump to start.

[0011] In any of the above technical solutions, further, the electric tractor cooling system also includes a motor temperature sensor and a battery temperature sensor; the motor temperature sensor can obtain the temperature of the motor, and the battery temperature sensor can obtain the temperature of the battery; the controller is pre-set with a first motor temperature value and a first battery temperature value, and the controller can receive the motor temperature value sent by the motor temperature sensor and the battery temperature value sent by the battery temperature sensor; when the motor temperature value obtained by the motor temperature sensor is less than or equal to the first motor temperature value, or when the battery temperature value obtained by the battery temperature sensor is less than or equal to the first battery temperature value, the controller controls the electronic fan to execute the first level of speed.

[0012] In any of the above technical solutions, further, the controller is pre-set with a second motor temperature value and a second battery temperature value; the second motor temperature value is greater than the first motor temperature value, and the second battery temperature value is greater than the first battery temperature value; when the motor temperature value obtained by the motor temperature sensor is greater than the first motor temperature value and less than or equal to the second motor temperature value, or when the battery temperature value obtained by the battery temperature sensor is greater than the first battery temperature value and less than or equal to the second battery temperature value, the controller controls the electronic fan to execute the second level of speed instead of the first level of speed.

[0013] In any of the above technical solutions, further, the controller is pre-set with a third motor temperature value and a third battery temperature value; the third motor temperature value is greater than the second motor temperature value, and the third battery temperature value is greater than the second battery temperature value; when the motor temperature value obtained by the motor temperature sensor is greater than the second motor temperature value and less than or equal to the third motor temperature value, or when the battery temperature value obtained by the battery temperature sensor is greater than the second battery temperature value and less than or equal to the third battery temperature value, the controller controls the electronic fan to execute the third level of speed, instead of the first and second levels of speed.

[0014] In any of the above technical solutions, further, the electronic fan is an air-suction electronic fan.

[0015] According to the electric tractor heat dissipation system of the present application, the electric tractor heat dissipation system includes a heat dissipation water tank, a motor, a battery and an electronic fan. The battery can supply power to the electronic fan, the speed of the electronic fan can be adjusted, and the electronic fan can dissipate heat from the coolant in the heat dissipation water tank; the coolant in the heat dissipation water tank can circulate through the battery and the motor to circulate and dissipate heat from the battery and the motor.

[0016] According to the above technical features, the beneficial effects of this application are:

[0017] The electric tractor of the present application replaces the existing diesel tractor, and on this basis, the electronic fan of the present application is directly powered by a battery and operates. The electronic fan dissipates heat from the coolant in the radiator water tank. The temperature of the coolant decreases after passing through the radiator water tank, and then enters the motor and battery that need to be cooled, taking away the heat generated by the operation of the motor and battery.

[0018] In summary, the electronic fan of the electric tractor of the present application is directly powered by a battery, so the speed of the electronic fan can be adjusted according to demand. Compared with the prior art, it does not need to rely on the drive of the engine, and therefore does not need to always run at the speed of maximum heat dissipation. Therefore, it can reduce power consumption and reduce noise.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram showing the overall structure of an electric tractor heat dissipation system according to an embodiment of the present application is shown;

[0022] Figure 2 A control flow chart of an electronic fan according to an embodiment of the present application is shown.

[0023] Icons: 1-electronic fan; 2-cooling water tank; 3-motor; 4-motor temperature sensor; 5-battery; 6-battery temperature sensor; 7-controller; 8-electronic water pump; 9-water outlet pipe; 10-water inlet pipe; 11-DC voltage converter. DETAILED DESCRIPTION

[0024] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0025] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0026] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0027] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0028] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0029] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0030] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0031] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0032] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0033] The first aspect of the present application provides an electric tractor heat dissipation system, which solves the problem that the traditional tractor cooling fan is mainly driven directly by the engine and is usually designed according to the maximum heat dissipation requirement. In this way, the fan speed cannot be adjusted in real time according to the actual heat dissipation demand, resulting in high power consumption and high noise.

[0034] The following will refer to Figure 1 to Figure 2 The electric tractor cooling system according to some embodiments of the present application is described in detail.

[0035] like Figure 1 As shown, the electric tractor cooling system of the present application includes a cooling water tank 2, a motor 3, a battery 5 and an electronic fan 1. The battery 5 can supply power to the electronic fan 1, the speed of the electronic fan 1 can be adjusted, and the electronic fan 1 can dissipate heat from the coolant in the cooling water tank 2; the coolant in the cooling water tank 2 can circulate through the battery 5 and the motor 3 to circulate and dissipate heat from the battery 5 and the motor 3.

[0036] The electric tractor of the present application replaces the existing diesel tractor, and on this basis, the electronic fan 1 of the present application is directly powered by the battery 5 and operates. The electronic fan 1 dissipates heat from the coolant in the cooling water tank 2. The temperature of the coolant decreases after passing through the cooling water tank 2, and then enters the motor 3 and the battery 5 that need to be cooled, and takes away the heat generated by the operation of the motor 3 and the battery 5.

[0037] In summary, the electronic fan 1 of the electric tractor of the present application is directly powered by the battery 5, so the speed of the electronic fan 1 can be adjusted according to demand. Compared with the prior art, it does not need to rely on the drive of the engine, and does not need to always run at the speed of maximum heat dissipation. Therefore, it can reduce power consumption and reduce noise.

[0038] Optionally, in an embodiment of the present application, Figure 1 As shown, the electric tractor cooling system also includes a water inlet pipe 10 and a water outlet pipe 9 connected to the cooling water tank 2. The motor 3 and the battery 5 are arranged in parallel, the water inlets of the motor 3 and the battery 5 are connected to the water outlet pipe 9, and the water outlets of the motor 3 and the battery 5 are connected to the water inlet pipe 10.

[0039] Optionally, in an embodiment of the present application, Figure 1 As shown, the electric tractor cooling system further includes an electronic water pump 8. The electronic water pump 8 is arranged on the water outlet pipe 9, and the battery 5 can supply power to the electronic water pump 8.

[0040] As an example, Figure 1 As shown, the electric tractor cooling system further includes a DC voltage converter 11. The power of the battery 5 is converted into 12V or 24V by the DC voltage converter 11 to supply power to the electronic fan 1 and the electronic water pump 8.

[0041] The heat dissipation solution of the present application for adjusting the fan speed in real time according to the temperature of the motor 3 and the battery 5 will be described in detail below.

[0042] The present application uses an electronic fan 1 with a PWM speed regulation function, which is driven by the high voltage electricity of the power battery 5 of the electric tractor, which is reduced to low voltage electricity by a DC voltage converter 11. Temperature sensors are provided inside the motor 3 and the battery 5, and the vehicle controller 7 adjusts the speed of the electronic fan 1 in real time by analyzing and comparing the motor temperature and the battery 5 temperature.

[0043] Specifically, Figure 1 As shown, the electric tractor cooling system includes a controller 7, which can control the electronic fan 1 and the electronic water pump 8 to start. The electric tractor cooling system also includes a motor temperature sensor 4 and a battery temperature sensor 6. The motor temperature sensor 4 can obtain the temperature of the motor 3, and the battery temperature sensor 6 can obtain the temperature of the battery 5.

[0044] As shown in the following table and Figure 2 As shown, the controller 7 is pre-set with a first motor temperature value and a first battery temperature value, and the controller 7 is capable of receiving the motor temperature value sent by the motor temperature sensor 4 and the battery temperature value sent by the battery temperature sensor 6. When the motor temperature value acquired by the motor temperature sensor 4 is less than or equal to the first motor temperature value, or when the battery temperature value acquired by the battery temperature sensor 6 is less than or equal to the first battery temperature value, the controller 7 controls the electronic fan 1 to execute the first level of speed.

[0045] Further, the controller 7 is pre-set with a second motor temperature value and a second battery temperature value, wherein the second motor temperature value is greater than the first motor temperature value, and the second battery temperature value is greater than the first battery temperature value. When the motor temperature value acquired by the motor temperature sensor 4 is greater than the first motor temperature value and less than or equal to the second motor temperature value, or when the battery temperature value acquired by the battery temperature sensor 6 is greater than the first battery temperature value and less than or equal to the second battery temperature value, the controller 7 controls the electronic fan 1 to execute the second level of speed instead of the first level of speed.

[0046] Furthermore, the controller 7 is pre-set with a third motor temperature value and a third battery temperature value, wherein the third motor temperature value is greater than the second motor temperature value, and the third battery temperature value is greater than the second battery temperature value; when the motor temperature value obtained by the motor temperature sensor 4 is greater than the second motor temperature value and less than or equal to the third motor temperature value, or when the battery temperature value obtained by the battery temperature sensor 6 is greater than the second battery temperature value and less than or equal to the third battery temperature value, the controller 7 controls the electronic fan 1 to execute the third level of speed, instead of executing the first and second levels of speed.

[0047] That is to say, the controller 7 controls the electronic fan 1 to execute the highest level of rotation speed.

[0048] As shown in the following table, the motor temperature value acquired by the motor temperature sensor 4 is Ta, the first motor temperature value is Xa1, the second motor temperature value is Xa2, and the third motor temperature value is Xa3.

[0049] The battery temperature value acquired by the battery temperature sensor 6 is Tb, the first battery temperature value is Xb1, the second battery temperature value is Xb2, and the third battery temperature value is Xb3.

[0050] The motor temperature value Ta obtained The battery temperature value Tb obtained Fan speed level PWM value <![CDATA[Ta≤Xa1]]> <![CDATA[Tb≤Xb1]]> K1 P1 <![CDATA[Xa1<Ta≤Xa2]]> <![CDATA[Xb1<Tb≤Xb2]]> K2 P2 <![CDATA[Xa2<Ta≤Xa3]]> <![CDATA[Xb2<Tb≤Xb3]]> K3 P3

[0051] Based on the above table and Figure 2 As shown, the fan selected in the present application is an air-suction electronic fan 1 with a PWM speed regulation function. The PWM control method is stepless speed regulation, and can respond to different speeds according to the PWM value issued by the vehicle controller 7.

[0052] This application uses a low-voltage (12V or 24V) suction fan and a low-voltage (12V or 24V) circulating water pump. The electronic fan 1 and the electronic water pump 8 are powered by the high-voltage electricity of the power battery converted into low-voltage direct current (12V or 24V) through a direct current voltage converter 11 (DC / DC).

[0053] As shown in the table above, the temperature value corresponding to the fan speed is set in the vehicle controller 7. The motor temperature value corresponds to three numerical ranges, the battery temperature value corresponds to three numerical ranges, each range corresponds to a fan speed level, and the fan speed level corresponds to a PWM signal value. The specific motor temperature numerical range (Xa1, Xa2, Xa3), battery temperature numerical range (Xb1, Xb2, Xb3), and fan PWM value (P1, P2, P3) are calculated based on the heat dissipation requirements of the electric tractor motor battery, the fan performance curve and other input theories.

[0054] Electric tractor fan speed control process Figure 2 As shown in the figure: After the tractor is powered on, the vehicle controller 7 will read the motor temperature value of the motor temperature sensor 4 and the battery temperature value of the battery temperature sensor 6 according to a fixed cycle. After reading the temperature, the vehicle controller 7 determines the fan speed level (as shown in the table above), compares the motor and battery fan levels, and sends a higher level PWM value to the electronic fan 1. The electronic fan 1 receives the PWM value and adjusts to the corresponding fan speed, thereby realizing intelligent control of the fan speed.

[0055] Cooling system working process: electronic fan 1 sucks air through cooling water tank 2, and different fan speeds correspond to different air flow rates. Air passes through cooling water tank 2 to take away the heat of cooling water tank 2, and electronic water pump 8 drives the circulation of coolant. The coolant cools down after passing through cooling water tank 2, and then enters motor 3 and battery 5 that need to be cooled, taking away the heat generated by the operation of motor 3 and battery 5. The coolant that absorbs the heat of motor 3 battery is recirculated into cooling water tank 2, thus completing the entire cooling cycle.

[0056] In summary, the electric tractor of the present application replaces the existing diesel tractor, and on this basis, the electronic fan 1 of the present application is directly powered by the battery 5 and operates. The electronic fan 1 dissipates heat from the coolant in the cooling water tank 2. The temperature of the coolant decreases after passing through the cooling water tank 2, and then enters the motor 3 and battery 5 that need to be cooled, taking away the heat generated by the operation of the motor 3 and battery 5.

[0057] The electronic fan of the electric tractor of the present application is directly powered by a battery and operates, so the speed of the electronic fan 1 can be adjusted according to demand. Compared with the prior art, it does not need to rely on the drive of the engine, and further does not need to always run at a speed with maximum heat dissipation. Therefore, when the tractor is in a low-load condition, the heat generated by the motor battery is less, and the fan speed can be adjusted to a low speed, thereby reducing power consumption and reducing fan noise.

[0058] Furthermore, the fan speed is adjusted in real time according to the temperature of the motor battery, which can effectively enhance the accuracy of the cooling system, ensure that the motor battery operates in the optimal temperature range, improve the working efficiency of the motor battery, and extend the service life.

[0059] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. An electric tractor cooling system, characterized in that: The electric tractor cooling system includes a cooling water tank, a motor, a battery and an electronic fan; The battery can supply power to the electronic fan, the speed of the electronic fan can be adjusted, and the electronic fan can dissipate heat from the coolant in the heat dissipation water tank; The coolant in the heat dissipation water tank can circulate through the battery and the motor to circulate and dissipate heat for the battery and the motor.

2. The electric tractor cooling system according to claim 1, characterized in that: The electric tractor cooling system also includes a water inlet pipe and a water outlet pipe connected to the cooling water tank; The motor and the battery are arranged in parallel, the water inlets of the motor and the battery are both connected to the water outlet pipe, and the water outlets of the motor and the battery are both connected to the water inlet pipe.

3. The electric tractor cooling system according to claim 2, characterized in that: The electric tractor cooling system further comprises an electronic water pump, which is arranged on the water outlet pipe; The battery is capable of supplying power to the electronic water pump.

4. The electric tractor cooling system according to claim 3, characterized in that: The electric tractor heat dissipation system also includes a DC voltage converter; The power of the battery is converted by the DC voltage converter to supply power to the electronic water pump and the electronic fan.

5. The electric tractor cooling system according to claim 4, characterized in that: The power of the battery is converted into 12V or 24V by the DC voltage converter to power the electronic fan and the electronic water pump.

6. The electric tractor cooling system according to claim 3, characterized in that: The electric tractor heat dissipation system also includes a controller; The controller can control the electronic fan and the electronic water pump to turn on.

7. The electric tractor cooling system according to claim 6, characterized in that: The electric tractor cooling system also includes a motor temperature sensor and a battery temperature sensor; The motor temperature sensor can obtain the temperature of the motor, and the battery temperature sensor can obtain the temperature of the battery; The controller is pre-set with a first motor temperature value and a first battery temperature value, and the controller is capable of receiving the motor temperature value sent by the motor temperature sensor and the battery temperature value sent by the battery temperature sensor; When the motor temperature value acquired by the motor temperature sensor is less than or equal to the first motor temperature value, or when the battery temperature value acquired by the battery temperature sensor is less than or equal to the first battery temperature value, the controller controls the electronic fan to execute a first level of rotation speed.

8. The electric tractor cooling system according to claim 7, characterized in that: The controller is pre-set with a second motor temperature value and a second battery temperature value; The second motor temperature value is greater than the first motor temperature value, and the second battery temperature value is greater than the first battery temperature value; When the motor temperature value obtained by the motor temperature sensor is greater than the first motor temperature value and less than or equal to the second motor temperature value, or when the battery temperature value obtained by the battery temperature sensor is greater than the first battery temperature value and less than or equal to the second battery temperature value, the controller controls the electronic fan to execute the second level of speed instead of the first level of speed.

9. The electric tractor cooling system according to claim 8, characterized in that: The controller is pre-set with a third motor temperature value and a third battery temperature value; The third motor temperature value is greater than the second motor temperature value, and the third battery temperature value is greater than the second battery temperature value; When the motor temperature value acquired by the motor temperature sensor is greater than the second motor temperature value and less than or equal to the third motor temperature value, or when the battery temperature value acquired by the battery temperature sensor is greater than the second battery temperature value and less than or equal to the third battery temperature value, the controller controls the electronic fan to execute the third level of speed instead of the first and second levels of speed.

10. The electric tractor cooling system according to any one of claims 1 to 9, characterized in that: The electronic fan is an air-suction electronic fan.

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