Thermal management control method and hybrid all-terrain vehicle

Abstract

The invention relates to the technical field of vehicles, and provides a thermal management control method and a hybrid power all-terrain vehicle, the hybrid power all-terrain vehicle comprises a thermal management system, the thermal management system comprises an engine loop and a battery loop, the engine loop comprises an engine, a control valve and a first water pump, and the battery loop comprises a battery pack, a thermistor and a second water pump. The engine loop and the battery loop exchange heat through heat exchange equipment, the heat management control method comprises the steps that heating modes are determined according to preset rules, and the heating modes comprise a conventional heating mode, a rapid heating mode and an economical heating mode. And matching a corresponding heating strategy based on the determined heating mode. And controlling an engine loop and a battery loop to heat the battery pack based on the heating strategy and the temperature parameter of the battery pack. The method can effectively improve the heat management efficiency and the energy utilization rate.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more particularly to a thermal management control method and a hybrid all-terrain vehicle. Background Technology

[0002] The power system of hybrid all-terrain vehicles (such as plug-in hybrid all-terrain vehicles and plug-in hybrid agricultural robots) includes a battery pack and a hybrid module. Among them, the battery pack is a key component of hybrid all-terrain vehicles, and its performance is directly affected by temperature. Therefore, thermal management of hybrid all-terrain vehicles is of great significance for ensuring the safety and stability of the battery pack.

[0003] Typically, in low-temperature environments (e.g., -20°C to 0°C), the lifespan and charging / discharging capacity of the battery pack in a hybrid all-terrain vehicle can be affected, potentially limiting the vehicle's power performance and range. Furthermore, charging the battery pack at low temperatures may result in incomplete chemical reactions within the battery pack, further damaging its lifespan. In such cases, if there is a need for driving or charging in low-temperature environments, the hybrid all-terrain vehicle's powertrain can be preheated for thermal management in low-temperature conditions.

[0004] In thermal management solutions for low-temperature environments, positive temperature coefficient (PTC) thermistors are used to heat the power system or battery pack of hybrid all-terrain vehicles. However, PTC heating is slow, requiring a considerable amount of time for the hybrid all-terrain vehicle's power performance to reach normal operation. Furthermore, PTC heating consumes a lot of energy; if the battery pack is at a low charge level, PTC heating will be ineffective. Therefore, the thermal management efficiency and energy utilization rate of these solutions are relatively low. Summary of the Invention

[0005] In view of this, this application provides a thermal management control method and a hybrid all-terrain vehicle, which have high thermal management efficiency and energy utilization rate.

[0006] A first aspect of this application provides a thermal management control method applied to a hybrid all-terrain vehicle. The hybrid all-terrain vehicle includes a thermal management system, which includes an engine circuit and a battery circuit. The engine circuit includes an engine, a control valve, and a first water pump. The battery circuit includes a battery pack, a thermistor, and a second water pump. The engine circuit and the battery circuit exchange heat through a heat exchange device. The thermal management control method includes: determining a heating mode according to preset rules, including a conventional heating mode, a rapid heating mode, and an economical heating mode; matching a corresponding heating strategy based on the determined heating mode; and controlling the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the temperature parameters of the battery pack.

[0007] In some embodiments, the temperature parameters include the minimum cell temperature and the minimum discharge temperature. The step of controlling the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the battery pack temperature parameters includes: if the determined heating mode is a conventional heating mode, obtaining the minimum discharge temperature and the minimum cell temperature before heating; comparing the minimum discharge temperature with the minimum cell temperature before heating, and controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result.

[0008] In some embodiments, controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result includes: if the minimum cell temperature before heating is lower than the minimum discharge temperature, controlling the engine to enter idle state, and opening the preset valve of the control valve, the first water pump, and the second water pump, so that the water temperature of the engine circuit rises, heating the battery pack through the heat exchange device, and obtaining the minimum cell temperature of the battery pack during heating, wherein the preset valve is connected to the battery circuit through the heat exchange device; if the minimum cell temperature during heating is higher than or equal to the minimum discharge temperature... The thermistor is activated according to its maximum available power, and the battery pack is heated through the heat exchange device and the thermistor. If the lowest cell temperature during heating is higher than or equal to the lowest charging temperature, the engine is stopped. When the water temperature in the engine circuit is higher than the water temperature in the battery circuit, the preset valve, the first water pump, and the second water pump are opened, and the battery pack is heated through the heat exchange device and the thermistor until the lowest cell temperature and the highest cell temperature in the battery pack are respectively within preset temperature ranges. Then, the thermistor is controlled to stop heating and the preset valve is closed.

[0009] In some embodiments, controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result includes: if the lowest cell temperature before heating is higher than or equal to the lowest discharge temperature, activating the thermistor according to the maximum available power of the thermistor, and heating the battery pack through the thermistor until the lowest cell temperature and the highest cell temperature are respectively within the preset temperature range, and then controlling the thermistor to stop heating.

[0010] In some embodiments, the thermal management control method further includes: obtaining the minimum power output of the battery pack and the maximum power output of the thermistor; and determining the maximum available power output of the thermistor based on the minimum power output and the maximum power output.

[0011] In some embodiments, the temperature parameters include the minimum cell temperature and the minimum charging temperature. The step of controlling the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the temperature parameters of the battery pack includes: if the determined heating mode is a rapid heating mode, obtaining the minimum cell temperature and the minimum charging temperature; comparing the minimum cell temperature and the minimum charging temperature, and controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result.

[0012] In some embodiments, controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result includes: if the minimum cell temperature is lower than the minimum charging temperature, controlling the engine to enter an idling state, and opening the preset valve of the control valve, the first water pump, and the second water pump to raise the water temperature of the engine circuit, thereby heating the battery pack through the heat exchange device; and activating the thermistor according to the maximum available power of the thermistor to heat the battery pack through the thermistor, wherein the preset valve is connected to the battery circuit through the heat exchange device; if the minimum cell temperature is higher than the minimum charging temperature, controlling the engine to enter an idling state, and opening the preset valve of the control valve, the first water pump, and the second water pump to raise the water temperature of the engine circuit, thereby heating the battery pack through the heat exchange device; if the minimum cell temperature is higher than the minimum charging temperature, controlling the engine to enter an idling state, and opening the preset valve of the control valve, the first water pump, and the second water pump to open the preset valve, the preset valve is connected to the battery circuit through the heat exchange device; if the minimum cell temperature is higher than the minimum charging temperature, controlling the engine to enter an idling state, and opening the preset valve of the control .... The engine is controlled to operate at or equal to the minimum charging temperature, based on the minimum power output of the engine. The preset valve, the first water pump, and the second water pump are opened, and the thermistor is operated according to the maximum available power of the thermistor. The battery pack is heated through the heat exchange equipment and the thermistor until the minimum temperature of the battery cell and the maximum temperature of the battery cell in the battery pack are within the preset temperature range. At this point, the engine is stopped, the thermistor stops heating, and the preset valve is closed. The minimum power output of the engine is determined based on the vehicle power consumption of the hybrid all-terrain vehicle and the chargeable power of the battery pack.

[0013] In some embodiments, the temperature parameters include the minimum cell temperature and the minimum discharge temperature. The step of controlling the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the battery pack temperature parameters includes: if the determined heating mode is an economical heating mode, obtaining the minimum cell temperature and the minimum discharge temperature; comparing the minimum cell temperature and the minimum discharge temperature; and controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result.

[0014] In some embodiments, controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result includes: if the minimum cell temperature is lower than the minimum discharge temperature, controlling the engine to enter an idling state, and opening the preset valve of the control valve, the first water pump, and the second water pump, so that the water temperature of the engine circuit rises, and the battery pack is heated through the heat exchange device, wherein the preset valve is connected to the battery circuit through the heat exchange device; if the minimum cell temperature is higher than or equal to the minimum discharge temperature, activating the thermistor according to the maximum available power of the thermistor, and controlling the engine to stop, and detecting the water temperature of the engine circuit and the water temperature of the battery circuit; if the water temperature of the engine circuit is higher than the water temperature of the battery circuit, opening the preset valve, the first water pump, and the second water pump, and heating the battery pack through the heat exchange device and the thermistor until the minimum cell temperature is higher than or equal to the minimum charging temperature of the battery pack, and then controlling the thermistor to enter a heat preservation mode.

[0015] A second aspect of this application provides a hybrid all-terrain vehicle, including a memory, a thermal management controller, and computer-readable instructions stored in the memory and executable on the thermal management controller, wherein the thermal management controller implements the above-described thermal management control method when executing the computer-readable instructions.

[0016] A third aspect of this application provides a computer-readable storage medium storing computer-readable instructions that, when executed by a thermal management controller, implement the above-described thermal management control method.

[0017] In the thermal management control method provided in this application embodiment, different heating modes are pre-set to meet different heating needs. Each heating mode corresponds to a different control strategy. During the thermal management control process, the hybrid all-terrain vehicle can determine the heating mode according to preset rules and match the corresponding heating strategy based on the determined heating mode. By coordinating the control of the engine circuit and battery circuit to heat the battery pack based on the matched heating strategy and the battery pack's temperature parameters, thermal management efficiency and energy utilization can be effectively improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the all-terrain vehicle provided in the embodiments of this application.

[0020] Figure 2 This is an example diagram of the architecture of the thermal management system provided in the embodiments of this application.

[0021] Figure 3 This is a flowchart illustrating the implementation of the thermal management control method provided in the embodiments of this application.

[0022] Figure 4 This is a flowchart illustrating the implementation of a thermal management control method provided in another embodiment of this application.

[0023] Figure 5 This is an example diagram of the thermal management control process under the conventional heating mode provided in the embodiments of this application.

[0024] Figure 6 This is an example diagram of the thermal management control process under the rapid heating mode provided in the embodiments of this application.

[0025] Figure 7 This is an example diagram of the thermal management control process under the economic heating mode provided in the embodiments of this application.

[0026] Figure 8 This is a schematic diagram of the thermal management control device provided in the embodiments of this application.

[0027] Figure 9 This is a schematic diagram of the structure of the hybrid all-terrain vehicle provided in the embodiments of this application. Detailed Implementation

[0028] It should be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0029] It should also be noted that the methods disclosed in the embodiments of this application or the methods shown in the flowcharts include one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged, and some steps can also be deleted.

[0030] Some embodiments will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] The thermal management control method provided in this application is applied to hybrid all-terrain vehicles. For example... Figure 1 The diagram shown is a schematic representation of a hybrid all-terrain vehicle 1000 provided in this embodiment of the application. The hybrid all-terrain vehicle 1000 includes a vehicle body 110 and a wheel assembly 120. The wheel assembly 120 includes a left front wheel 121, a right front wheel 122, a left rear wheel (not shown in the figure), and a right rear wheel 123.

[0032] In some embodiments, hybrid all-terrain vehicles include, but are not limited to, plug-in hybrid all-terrain vehicles and plug-in hybrid agricultural robots.

[0033] In some embodiments, the hybrid all-terrain vehicle includes a thermal management system, which may include a thermal management controller. The hybrid all-terrain vehicle uses the thermal management controller to manage and control the engine, battery pack, and other components within the thermal management control system, thereby achieving heating management of the battery pack.

[0034] The device control method provided in this application can also be applied to other scenarios. For example, in some scenarios, it may include a hybrid all-terrain vehicle and a user terminal, through which the user can remotely manage and control the hybrid all-terrain vehicle; in some scenarios, it may only include a hybrid all-terrain vehicle; in some scenarios, it may also include interaction between the hybrid all-terrain vehicle and other types of equipment. The above scenarios are merely illustrative examples, and this application does not limit the specific application scenarios of the device control method.

[0035] Please see Figure 2 The diagram shown is an example of the architecture of a thermal management system 100 provided in an embodiment of this application. Figure 2As shown, the thermal management system 100 includes a first branch 10, a second branch 20, a third branch 30, a fourth branch 40, and a fifth branch 50. The first branch 10 includes a control valve 11, a first water pump 12, an engine 13, a thermostat 14, and a three-way pipe 15. The second branch 20 includes a heat exchange device 21. The third branch 30 includes a thermistor (Positive Temperature Coefficient, PTC) 31, a heat exchange device 32, a temperature sensor 33, a battery pack 34, and a second water pump 35. The fourth branch 40 includes a high-temperature radiator 41, a fan 42, and a temperature sensor 43. The fifth branch 50 includes a compressor 51, a pressure sensor 52, a condenser 53, and an expansion valve 54.

[0036] One end of the first branch 10 is connected to one end of the second branch 20 through ports a and b of the tee pipe 15. The other end of the first branch 10 is connected to the other end of the second branch 20 through valves a and b of the control valve 11. When valves a and b of the control valve 11 are open, the first branch 10 and the second branch 20 form a loop, which can be used as an engine circuit. The third branch 30 forms a loop through the heat exchange device 21 in the second branch 20, and the loop formed by the third branch 30 and the heat exchange device 21 can be used as a battery circuit. One end of the fourth branch 40 is connected to port c of the tee pipe 15, and one end of the first branch 10 and one end of the fourth branch 40 are connected through ports a and c of the tee pipe 15. The other end of the first branch 10 is connected to the other end of the fourth branch 40 via valves a and c of control valve 11. When valves a and c of control valve 11 are open, the first branch 10 and the fourth branch 40 form a loop, which can be used as an engine cooling loop. The fifth branch 50 is connected to the battery circuit via heat exchange device 32. The fifth branch 50 and the heat exchange device 32 form a compressor circuit.

[0037] In some embodiments, the thermal management system further includes a thermal management controller ( Figure 2 (Not shown in the image), the thermal management controller can be used to control, for example... Figure 2 The thermal management system 100 shown controls and manages the various components to achieve functions such as heating the battery pack 34.

[0038] like Figure 2As shown, the thermal management controller can control the engine circuit to heat the battery pack 34. During the process of controlling the engine circuit to heat the battery pack 34, the thermal management controller can open the first water pump 12, the second water pump 35, valves a and b of the control valve 11, and control the engine 13 to operate (e.g., control the engine 13 to enter idle state or control the engine 13 to generate electricity), causing the coolant temperature in the engine 13 to rise. The cooled coolant flows out of the engine 13 and towards the first water pump 12. The first water pump 12 drives the coolant circulation in the engine circuit, causing the coolant temperature in the engine circuit to rise. The cooled coolant, after reaching the second branch 20, passes through the heat exchange device 21, transferring heat to the battery circuit. Simultaneously, the second water pump 35 drives the coolant circulation in the battery circuit, causing the coolant temperature in the battery circuit to rise. In the battery circuit, the cooled coolant flowing towards the battery pack 34 heats the battery pack 34.

[0039] like Figure 2 As shown, the thermal management controller can heat the battery pack 34 through the thermistor 31 in the battery circuit. During the process of controlling the thermistor 31 to heat the battery pack 34, the thermal management controller can turn on the thermistor 31. Once the thermistor 31 is turned on, it can heat the coolant flowing to it, and the heated coolant then flows to the battery pack 34, thus heating the battery pack 34.

[0040] In some scenarios, the thermal management controller can control the engine circuit to heat the battery pack 34. In other scenarios, the thermal management controller can control the battery circuit to heat the battery pack 34. In still other scenarios, the thermal management controller can also control the engine circuit and battery circuit to cooperate in heating the battery pack 34. The specific method of heating the battery pack 34 can be determined according to user needs or actual scenario requirements.

[0041] This application embodiment heats the battery pack 34 by coordinating the engine circuit and the battery circuit in the control circuit, which can improve heating efficiency and energy utilization.

[0042] In some embodiments, the engine cooling circuit is mainly used to cool the coolant in the engine cooling circuit through the high-temperature radiator 41 and fan 42, thereby achieving heat dissipation for the engine 13. The compressor circuit is mainly used to cool the coolant in the compressor circuit through the compressor 51 and condenser 53. At the same time, since the compressor circuit and the battery circuit can exchange heat through the heat exchange device 32, the coolant in the battery circuit can be cooled through the compressor circuit, thereby achieving cooling of the battery pack 34.

[0043] The embodiments of this application can solve the heating problem of battery pack 34 in low temperature environment. The engine cooling circuit and compressor circuit are mainly used for cooling the circuit. The control strategies of compressor circuit and engine cooling circuit will not be described in detail here.

[0044] In some embodiments, the thermostat 14 in the first branch 10 is used to control the coolant temperature in the engine 13 within a suitable temperature range.

[0045] In some embodiments, the temperature sensor 33 in the second branch 20 is used to detect the temperature of the battery inlet. The thermal management controller can acquire the temperature of the battery inlet in real time and control the operation of the compressor 51, condenser 53, etc. in the compressor circuit according to the temperature of the battery inlet, so as to ensure that the temperature difference between the temperature of the battery inlet and the lowest temperature of the battery cells in the battery pack 34 is less than or equal to a first preset temperature. The first preset temperature can be customized according to battery characteristics, etc., for example, the first preset temperature can be set to 20°C.

[0046] In some embodiments, the temperature sensor 43 of the fourth branch 40 is used to detect the temperature of the engine 13 inlet. The thermal management controller can acquire the temperature of the engine 13 inlet in real time and control the operation of the control valve 11, fan 42, high-temperature radiator 41, etc. in the engine circuit according to the temperature of the engine 13 inlet, so as to ensure that the temperature of the engine 13 inlet is less than or equal to a second preset temperature. The second preset temperature can be customized according to the characteristics of the engine 13, etc.

[0047] In some embodiments, the control valve 11 includes, but is not limited to, a three-way valve. Both heat exchange equipment 21 and heat exchange equipment 32 include, but are not limited to, plate heat exchangers. Both the first water pump 12 and the second water pump 35 include, but are not limited to, mechanical water pumps, electric water pumps, etc. The expansion valve 54 includes, but is not limited to, an electronic expansion valve.

[0048] Figure 2 The illustration shown is an example of a thermal management system. This application does not limit the location or type of some components in its embodiments.

[0049] Please see Figure 3 The diagram shown is a flowchart of the implementation of the thermal management control method provided in this application embodiment. The method is applied to a hybrid all-terrain vehicle and includes the following steps.

[0050] S11: Determine the heating mode according to preset rules.

[0051] In some embodiments, the heating modes include, but are not limited to, a conventional heating mode, a rapid heating mode, and an economical heating mode. The default heating mode for a hybrid all-terrain vehicle can be set to the conventional heating mode. This application does not limit the default heating mode; it can be adjusted according to actual application needs.

[0052] In some embodiments of this application, among the conventional heating mode, rapid heating mode, and economic heating mode, the rapid heating mode heats up faster than the conventional and economic heating modes, thus meeting the need for rapid heating of the battery pack in low-temperature environments. In economic heating mode, the hybrid all-terrain vehicle can comprehensively assess heating energy consumption, saving heating costs. In conventional heating mode, the hybrid all-terrain vehicle can balance heating time and energy consumption, fully utilizing vehicle energy (such as heat provided by the engine and heat provided by the PTC) to improve heating efficiency.

[0053] In some embodiments, determining the heating mode according to preset rules for a hybrid all-terrain vehicle may include: determining the heating mode in response to a user's selection operation; or determining the triggered heating mode according to preset triggering conditions.

[0054] In this embodiment, the hybrid all-terrain vehicle may include a user interface, through which interaction with the user can be achieved. Accordingly, preset rules may include displaying multiple heating mode options for the user to choose from on the user interface, and the hybrid all-terrain vehicle can determine the heating mode in response to the user's selection. For example, the multiple heating mode options may include a normal heating mode option, a rapid heating mode option, and an economical heating mode option, etc.

[0055] In this embodiment, the hybrid all-terrain vehicle can also establish a communication connection with a user terminal, allowing the user to remotely control and manage the vehicle. During the process of determining the heating mode according to preset rules, the user can select a heating mode through the user terminal. Responding to the user's selection, the user terminal acquires the heating mode information and sends it to the hybrid all-terrain vehicle. The hybrid all-terrain vehicle then parses the heating mode information to determine the heating mode.

[0056] In other embodiments, the preset rules may include trigger conditions corresponding to each heating mode. These trigger conditions may include multiple preset temperature ranges. For example, when the lowest cell temperature is within a first temperature range, a conventional heating mode is activated; when the lowest cell temperature is within a second temperature range, a rapid heating mode is activated; and when the lowest cell temperature is within a third temperature range, an economical heating mode is activated. In the process of determining the heating mode according to the preset rules, the hybrid all-terrain vehicle can determine the activated heating mode based on the temperature range where the lowest cell temperature is located. The first, second, and third temperature ranges can be customized based on experience or through testing. This application does not limit the method of determining the heating mode.

[0057] This application embodiment allows users to select different heating modes, which can meet different heating needs and improve user experience.

[0058] S12: Based on the determined heating mode, match the corresponding heating strategy.

[0059] In some embodiments, heating modes and heating strategies correspond to each other. The heating strategy characterizes the energy management and control methods adopted by the hybrid all-terrain vehicle in the process of heating the battery pack.

[0060] In some embodiments, to meet different user heating needs, the hybrid all-terrain vehicle employs different heating strategies for the battery under different heating modes. After determining the heating mode according to preset rules, the hybrid all-terrain vehicle can match the heating strategy corresponding to the determined heating mode based on the determined heating mode and the correspondence between the heating mode and the heating strategy. The heating of the battery pack according to different heating strategies can also be referred to the following section on... Figures 4 to 7 Explanation of the process shown.

[0061] S13: Based on the heating strategy and the temperature parameters of the battery pack, control the engine circuit and the battery circuit to heat the battery pack.

[0062] In some embodiments, the temperature parameters of the battery pack include, but are not limited to, minimum cell temperature, maximum cell temperature, minimum discharge temperature, and minimum charging temperature. The battery pack may include multiple battery modules, and each battery module may consist of multiple cells. The minimum cell temperature refers to the cell temperature corresponding to the lowest temperature among the multiple cells in the battery pack. The maximum cell temperature refers to the cell temperature corresponding to the highest temperature among the multiple cells in the battery pack. Both the minimum and maximum cell temperatures are easily affected by ambient temperature. The minimum discharge temperature refers to the lowest ambient temperature at which the battery pack can safely discharge under normal operating conditions. The minimum charging temperature refers to the lowest ambient temperature at which the battery pack can safely charge during normal charging. Typically, the minimum discharge temperature is lower than the minimum charging temperature.

[0063] In some embodiments, the minimum and maximum cell temperatures can be obtained through direct detection, such as by using a temperature sensor. This application does not limit the method of obtaining the minimum and maximum cell temperatures.

[0064] In some embodiments, the minimum discharge temperature and minimum charge temperature can be determined based on the properties of the cells in the battery pack, and their temperature values ​​are generally constant. For example, if the battery modules in the battery pack use lithium batteries, then depending on the properties of lithium batteries, the minimum discharge temperature can be -20°C and the minimum charge temperature can be 0°C.

[0065] In some embodiments, ensuring that the cell temperature of the battery pack is within an optimal temperature range helps to optimize the charging and discharging efficiency of the battery pack, resulting in more stable battery pack operation and extending battery pack lifespan. Therefore, hybrid all-terrain vehicles can flexibly control the engine circuit and battery circuit to heat the battery pack based on the battery pack's temperature parameters and heating strategy. During the control process, the corresponding heating strategy can be adjusted appropriately according to temperature changes, ensuring that the cell temperature of the battery pack (e.g., the minimum and maximum cell temperatures) is within an optimal temperature range.

[0066] For example, in low-temperature environments, hybrid all-terrain vehicles can control the engine and battery circuits to heat the battery pack based on the lowest cell temperature. To further ensure the battery pack has good charging and discharging capabilities, the hybrid all-terrain vehicle can compare the lowest cell temperature with the lowest charging or discharging temperature, and control the engine and battery circuits to heat the battery pack based on the comparison result. This ensures that the lowest cell temperature of the heated battery pack is higher than the lowest charging or discharging temperature, thereby guaranteeing the battery pack has good charging and discharging capabilities.

[0067] Please see Figure 4 The diagram shown is a flowchart illustrating the implementation of a thermal management control method according to another embodiment of this application. Figure 4 As shown, the method includes steps S21 to S28, and the specific steps are as follows.

[0068] S21: Determine the heating mode according to preset rules.

[0069] S22: Based on the determined heating mode, match the corresponding heating strategy.

[0070] In this embodiment, the specific implementation details of steps S21 to S22 can be found in the following examples. Figure 3 The embodiments corresponding to steps S11 to S12 will not be repeated here.

[0071] S23: If the determined heating mode is the conventional heating mode, obtain the minimum discharge temperature and the minimum cell temperature before heating.

[0072] In some embodiments, under normal heating mode, the hybrid all-terrain vehicle can obtain the lowest discharge temperature of the battery pack and the lowest cell temperature before heating, and control the operation of the engine circuit and battery circuit based on the lowest discharge temperature and the lowest cell temperature before heating to achieve heating of the battery pack.

[0073] In some embodiments, the default heating mode for a hybrid all-terrain vehicle can be the regular heating mode.

[0074] S24: Compare the lowest discharge temperature with the lowest cell temperature before heating, and control the engine circuit and battery circuit to heat the battery pack based on the comparison result.

[0075] In some embodiments, under normal heating mode, in order to balance heating time and energy consumption, make full use of vehicle energy, and improve heating efficiency, the hybrid all-terrain vehicle can compare the lowest discharge temperature with the lowest cell temperature before heating, and control the engine circuit and battery circuit to heat the battery pack based on the comparison result.

[0076] S25: If the determined heating mode is rapid heating mode, obtain the lowest cell temperature and the lowest charging temperature.

[0077] In some embodiments, in rapid heating mode, in order to reduce heating time so that users can use the vehicle quickly, the hybrid all-terrain vehicle can obtain the lowest charging temperature of the battery pack and the lowest temperature of the battery cells, and control the operation of the engine circuit and the battery circuit based on the lowest charging temperature and the lowest temperature of the battery cells to achieve heating of the battery pack.

[0078] S26: Compare the lowest cell temperature with the lowest charging temperature, and control the engine circuit and battery circuit to heat the battery pack based on the comparison result.

[0079] In some embodiments, in rapid heating mode, the hybrid all-terrain vehicle controls the operation of the engine circuit and the battery circuit based on the lowest charging temperature and the lowest cell temperature to heat the battery pack. This includes comparing the lowest discharge temperature with the lowest cell temperature before heating, and controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result.

[0080] S27: If the determined heating mode is the economic heating mode, obtain the minimum cell temperature and the minimum discharge temperature.

[0081] In some embodiments, under economic heating mode, the hybrid all-terrain vehicle can obtain the lowest discharge temperature of the battery pack and the lowest temperature of the battery cells, and control the operation of the engine circuit and the battery circuit based on the lowest discharge temperature and the lowest temperature of the battery cells to achieve heating of the battery pack.

[0082] S28: If the determined heating mode is the economic heating mode, obtain the minimum cell temperature and the minimum discharge temperature.

[0083] In some embodiments, under the economic heating mode, the hybrid all-terrain vehicle controls the operation of the engine circuit and the battery circuit based on the minimum discharge temperature and the minimum cell temperature. Heating the battery pack includes comparing the minimum discharge temperature with the minimum cell temperature before heating, and controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison result.

[0084] like Figure 5 As shown, the thermal management control method under conventional heating mode includes steps S240 and S241. Step S241 includes S2410 to S2419, and the specific steps are as follows.

[0085] in, Figure 5 China T cellmin Indicates the lowest temperature of the battery cell, T cellmax T represents the highest temperature of the battery cell. Dmin T represents the minimum discharge temperature. Cmin Indicates the minimum charging temperature, T Imin With T Imax T represents the preset cell temperature threshold. Imin T represents the minimum cell temperature threshold. Imax This indicates the highest cell temperature threshold. Imin With T Imax Settings can be customized based on experience or through testing. For example, when the battery module in the battery pack is a lithium battery, T Imin You can take 20℃, T Imax 45°C can be used. This application embodiment addresses T. Imin With T Imax The value of T is not restricted. cellmin With T cellmax Satisfy T Imin ≤T cellmin ≤T cellmax ≤T Imax At that time, the lowest and highest temperatures of the battery cell are within the preset temperature range.

[0086] S240: Minimum discharge temperature T Dmin The lowest cell temperature T before heating cellmin Compare them.

[0087] In some embodiments, the content of step S240 can be referred to as follows: Figure 4 The embodiment of step S24 shown will not be repeated here.

[0088] S241: Determine the lowest cell temperature T before heating cellmin Is it less than the minimum discharge temperature T? Dmin .

[0089] S2410: If the lowest temperature of the battery cell before heating is T cellmin Less than the minimum discharge temperature T Dmin The system controls the engine to idle and opens preset valves, the first water pump, and the second water pump, causing the engine circuit water temperature to rise. This heats the battery pack via a heat exchange device, and the system obtains the lowest cell temperature T during battery pack heating. cellmin .

[0090] In some embodiments, the control valve can be a three-way valve. The hybrid all-terrain vehicle can control the coolant circulation in each circuit connected to the control valve by controlling the opening and closing of each valve in the control valve. This application does not limit the type of control valve. For example... Figure 2 As shown, the control valve can be a three-way valve 11, and the preset valve can be valve b of the three-way valve 11. The preset valve is connected to the second branch 20. In low-temperature environments, such as when the minimum temperature of the battery pack cells is below 0°C, charging the battery pack is generally not allowed, or only a very small current is allowed to charge the battery pack. This is because if the battery pack is directly charged in a low-temperature environment, or if a large current is used to charge the battery pack, the battery pack may overheat or be damaged due to incomplete chemical reactions inside the battery pack, thus shortening the battery pack's lifespan. However, if the electric motor is used to heat the battery pack when the battery pack cell temperature is low, the current generated by the electric motor will inevitably flow into the battery pack, causing overcharging and damaging the battery pack's lifespan. If the electric motor is not used to heat the battery pack when the battery pack cell temperature is low, the performance of the hybrid all-terrain vehicle will be limited, reducing its range.

[0091] To address the aforementioned issues, hybrid all-terrain vehicles can control the engine to idle when the minimum cell temperature before heating is determined to be below the minimum discharge temperature. The engine does not generate electricity while idling, thus preventing current from flowing into the battery pack and damaging its lifespan. Simultaneously, controlling the engine to idle while heating the battery pack accelerates the heating process, shortens the heating time, and prevents limitations on the hybrid all-terrain vehicle's performance and range.

[0092] In this embodiment, during the process of heating the battery pack while controlling the engine to idle, the hybrid all-terrain vehicle can open a preset valve on the control valve, initiating coolant circulation in the engine circuit and thus raising the engine circuit's water temperature. Simultaneously, the hybrid all-terrain vehicle activates the first water pump in the engine circuit and the second water pump in the battery circuit. The first water pump drives coolant circulation in the engine circuit, and the second water pump drives coolant circulation in the battery circuit. The coolant circulation in the engine circuit carries heat to the heat exchange device between the engine circuit and the battery circuit. This heat exchange device then transfers heat to the battery circuit, and the coolant circulation in the battery circuit further carries the heat to the battery pack, thereby heating the battery pack.

[0093] In some embodiments, during the process of heating the battery pack by controlling the engine to idle, the minimum and maximum cell temperatures of the battery pack change as heating progresses. The hybrid all-terrain vehicle can detect the minimum cell temperature of the battery pack in real time. When the minimum cell temperature reaches a preset temperature, the hybrid all-terrain vehicle can activate other energy devices to work in conjunction with the engine and other energy devices to heat the battery pack, improving heating efficiency. The preset temperature may include a minimum discharge temperature or a minimum charge temperature. Other energy devices may include PTC devices, etc.

[0094] S2411: Determine the minimum cell temperature T during heating. cellmin Is it greater than or equal to the minimum discharge temperature T? Dmin .

[0095] S2412: If the lowest cell temperature T during heating is... cellmin Greater than or equal to the minimum discharge temperature T Dmin The thermistor is activated according to its maximum available power, and the battery pack is heated by the thermistor through a heat exchange device.

[0096] In some embodiments, when the minimum cell temperature during heating is determined to be greater than or equal to the minimum discharge temperature, the hybrid all-terrain vehicle can activate the PTC device according to the maximum available power of the thermistor, while keeping the engine at idle, and work with the engine and the PTC device to heat the battery pack to improve heating efficiency.

[0097] In other embodiments, if it is determined that the lowest cell temperature during heating is lower than the lowest discharge temperature, the hybrid all-terrain vehicle can return to step S2410 to control the engine to enter idle state and open the preset valve of the control valve, the first water pump and the second water pump, so that the water temperature of the engine circuit rises, the battery pack is heated through the heat exchange device, and the lowest cell temperature during battery pack heating is obtained.

[0098] In some embodiments of this application, the hybrid all-terrain vehicle can obtain the maximum available power of the thermistor by: obtaining the minimum power generation of the battery pack and the maximum power of the thermistor; and determining the maximum available power of the thermistor based on the minimum power generation and the maximum power.

[0099] In some embodiments, the hybrid all-terrain vehicle can use the minimum value between the battery pack's minimum power output and the thermistor's maximum power as the thermistor's maximum usable power. For example, if the battery pack's minimum power output is less than the thermistor's maximum power, the hybrid all-terrain vehicle can use the battery pack's minimum power output as the thermistor's maximum usable power to avoid damage to the battery pack. If the battery pack's minimum power output is greater than the thermistor's maximum power, the hybrid all-terrain vehicle can use the thermistor's maximum power as the thermistor's maximum usable power to avoid damage to the thermistor due to excessive power.

[0100] S2413: Determine the lowest cell temperature T during heating cellmin Is it greater than or equal to the minimum charging temperature T? Cmin .

[0101] S2414: If the lowest cell temperature T during heating is... cellmin Greater than or equal to the minimum charging temperature T Cmin The engine is shut down. When the water temperature in the engine circuit is higher than that in the battery circuit, a preset valve, the first water pump, and the second water pump are opened, and the battery pack is heated through a heat exchange device and a thermistor.

[0102] In some embodiments, as the battery pack is heated, the hybrid all-terrain vehicle can detect the minimum cell temperature of the battery pack in real time or periodically. If the minimum cell temperature during heating is determined to be greater than or equal to the minimum charging temperature of the battery pack, it indicates that the battery pack's charging and discharging capabilities have largely returned to normal, and its performance is relatively stable. In this case, to save energy, the hybrid all-terrain vehicle can control the engine to shut down.

[0103] In some embodiments, after the engine is shut down, the hybrid all-terrain vehicle can detect whether the minimum and maximum cell temperatures of the battery pack are within a preset temperature range. If the minimum and maximum cell temperatures are within the preset temperature range, it indicates that the cell temperature of the battery pack is within an optimal temperature range. Within the preset temperature range, the battery pack exhibits optimal performance. At this time, the hybrid all-terrain vehicle can shut down the thermistor, the preset valve, the first water pump, and the second water pump, ceasing to heat the battery pack.

[0104] After the engine is shut down, if the minimum and maximum cell temperatures are not within the preset temperature range, the hybrid all-terrain vehicle can further determine whether the engine circuit coolant temperature is higher than the battery circuit coolant temperature. If it is determined that the engine circuit coolant temperature is higher than the battery circuit coolant temperature, the hybrid all-terrain vehicle can keep preset valves, the first and second water pumps, and the thermistor (PTC) open to heat the battery pack through heat exchange equipment and the thermistor.

[0105] In other embodiments, if the lowest cell temperature during heating is lower than the lowest charging temperature, the hybrid all-terrain vehicle can return to step S2412, activate the thermistor according to its maximum available power, and heat the battery pack through a heat exchange device and the thermistor.

[0106] S2415: Determine the lowest cell temperature T cellmin With the highest temperature T of the battery cell cellmax Is it within the preset temperature range T? Imin ≤T cellmin ≤T cellmax ≤T Imax Inside.

[0107] S2416: If the lowest temperature of the battery cell is T cellmin With the highest temperature T of the battery cell cellmax Within the preset temperature range, the thermistor is controlled to stop heating and close the preset valve.

[0108] When the engine is shut down and the engine circuit coolant temperature is higher than the battery circuit coolant temperature, the hybrid all-terrain vehicle opens preset valves, the first water pump, and the second water pump, and heats the battery pack through heat exchange equipment and a thermistor. During this process, the vehicle can periodically monitor the minimum and maximum cell temperatures of the battery pack. If the minimum and maximum cell temperatures are determined to be within a preset temperature range, the hybrid all-terrain vehicle can control the thermistor to stop heating and close the preset valves, the first water pump, and the second water pump, thus stopping the heating of the battery pack and preventing overheating. In other embodiments, if the minimum or maximum cell temperature is less than a minimum cell temperature threshold T... Imin The hybrid all-terrain vehicle can continue to control the engine to stop. When the water temperature in the engine circuit is higher than the water temperature in the battery circuit, the preset valve, the first water pump and the second water pump are opened, and the battery pack is heated through the heat exchange equipment and thermistor until the minimum temperature and the maximum temperature of the battery cell are within the preset temperature range.

[0109] In other embodiments, if the highest cell temperature is greater than the highest cell temperature threshold T Imax Hybrid all-terrain vehicles can cool the battery pack by controlling the compressor circuit.

[0110] In other embodiments, the hybrid all-terrain vehicle does not limit the method of cooling the battery pack. For example, the hybrid all-terrain vehicle can also cool the engine through the engine cooling circuit, thereby reducing the temperature of the engine circuit and thus assisting in cooling the battery circuit through the engine circuit.

[0111] S2417: If the lowest temperature of the battery cell before heating is T cellminGreater than or equal to the minimum discharge temperature T Dmin The thermistor is activated according to its maximum available power, and the battery pack is heated by the thermistor.

[0112] In some embodiments, the hybrid all-terrain vehicle may obtain the maximum available power of the thermistor by: obtaining the minimum power output of the battery pack and the maximum power output of the thermistor; and determining the maximum available power output of the thermistor based on the minimum power output and the maximum power output.

[0113] In this embodiment, if the lowest cell temperature before heating is determined to be greater than or equal to the lowest discharge temperature, the hybrid all-terrain vehicle can activate the thermistor according to its maximum available power and heat the battery pack through the thermistor. In this case, when the lowest cell temperature before heating is greater than or equal to the lowest discharge temperature, the battery pack has a certain discharge capacity and can supply power to the PTC device. To make full use of energy, the hybrid all-terrain vehicle can heat the battery pack through the PTC device.

[0114] In other scenarios, if the minimum cell temperature T before heating is determined... cellmin Greater than or equal to the minimum charging temperature T Cmin Hybrid all-terrain vehicles can also use the engine to heat the battery pack in conjunction with the thermistor.

[0115] In other scenarios, if the minimum cell temperature T before heating is determined... cellmin Greater than or equal to the minimum charging temperature T Cmin Hybrid all-terrain vehicles can also use the engine to heat the battery pack.

[0116] During the heating process of the battery pack using a thermistor, the hybrid all-terrain vehicle can monitor the lowest cell temperature T in real time. cellmin With the highest temperature T of the battery cell cellmax Conduct testing.

[0117] S2418: Determine the lowest cell temperature T cellmin With the highest temperature T of the battery cell cellmax Is it within the preset temperature range T? Imin ≤T cellmin ≤T cellmax ≤T Imax Inside.

[0118] S2419: If the lowest temperature of the battery cell is T cellmin With the highest temperature T of the battery cell cellmax Within the preset temperature range, the thermistor stops heating.

[0119] While the thermistor is activated at its maximum available power to heat the battery pack, the hybrid all-terrain vehicle can periodically monitor the minimum and maximum cell temperatures of the battery pack. If the minimum and maximum cell temperatures are determined to be within a preset temperature range, the hybrid all-terrain vehicle can control the thermistor to stop heating the battery pack, thus preventing overheating.

[0120] In other embodiments, if the lowest or highest cell temperature is less than the lowest cell temperature threshold T Imin The hybrid all-terrain vehicle can continue to activate the thermistor according to its maximum available power and heat the battery pack through the thermistor until the minimum and maximum cell temperatures are within the preset temperature range.

[0121] In other embodiments, if the highest cell temperature is greater than the highest cell temperature threshold T Imax Hybrid all-terrain vehicles can cool the battery pack by controlling the compressor circuit.

[0122] In other embodiments, the hybrid all-terrain vehicle does not limit the method of cooling the battery pack. For example, the hybrid all-terrain vehicle can also cool the engine through the engine cooling circuit, thereby reducing the temperature of the engine circuit and thus assisting in cooling the battery circuit through the engine circuit.

[0123] In normal heating mode, the hybrid all-terrain vehicle balances heating time and energy consumption, making full use of the vehicle's energy and improving heating efficiency.

[0124] like Figure 6 As shown, the thermal management control method in rapid heating mode includes steps S260 and S261. Step S261 includes S2610 to S2613, and the specific steps are as follows.

[0125] in, Figure 6 China T cellmin Indicates the lowest temperature of the battery cell, T cellmax T represents the highest temperature of the battery cell. Cmin Indicates the minimum charging temperature, T Imin With T Imax T is the preset cell temperature threshold. Imin With T Imax Settings can be customized based on experience or through testing; for example, when the battery module in the battery pack is a lithium battery, T Imin You can take 20℃, T Imax 45°C can be used. This application embodiment addresses T. Imin With T Imax The value of T is not restricted. cellmin With T cellmaxSatisfy T Imin ≤T cellmin ≤T cellmax ≤T Imax At that time, the lowest and highest temperatures of the battery cell are within the preset temperature range.

[0126] S260: Set the lowest cell temperature T cellmin With the lowest charging temperature T Cmin Compare them.

[0127] In some embodiments, the content of step S260 can be referred to as follows: Figure 4 The embodiment of step S26 shown will not be repeated here.

[0128] S261: Determine the lowest cell temperature T cellmin Is it below the minimum charging temperature T? Cmin .

[0129] S2610: If the lowest cell temperature T cellmin Less than the minimum charging temperature T Cmin The system controls the engine to enter idle state and opens the preset valve of the control valve, the first water pump and the second water pump, so that the water temperature of the engine circuit rises, the battery pack is heated through the heat exchange equipment, and the thermistor is activated according to the maximum available power of the thermistor to heat the battery pack.

[0130] In some embodiments, the control valve can be a three-way valve. The hybrid all-terrain vehicle can control the coolant circulation in each circuit connected to the control valve by controlling the opening and closing of each valve in the control valve. This application does not limit the type of control valve. In this embodiment, the preset valve of the control valve is connected to the battery circuit through a heat exchange device. For example... Figure 2 As shown, the control valve is a three-way valve, and the preset valve can be valve b of the three-way valve.

[0131] In some embodiments, the hybrid all-terrain vehicle may obtain the maximum available power of the thermistor by: obtaining the minimum power output of the battery pack and the maximum power output of the thermistor; and determining the maximum available power output of the thermistor based on the minimum power output and the maximum power output.

[0132] In this embodiment, under rapid heating mode, if the minimum cell temperature is determined to be lower than the minimum charging temperature, the hybrid all-terrain vehicle can control the engine to idle and open the preset valves of the control valve, the first water pump, and the second water pump, causing the water temperature in the engine circuit to rise. This heats the battery pack through the heat exchange device, and the thermistor is activated according to the maximum available power of the PTC device to heat the battery pack. By coordinating the engine and the PTC device to heat the battery pack, the heating speed can be greatly accelerated and the heating time shortened.

[0133] In other embodiments, considering the high power consumption and slow heating rate of the thermistor at low temperatures, to save energy, the hybrid all-terrain vehicle can first determine whether the lowest cell temperature is greater than or equal to the lowest discharge temperature before activating the thermistor based on its maximum available power. If the lowest cell temperature is determined to be greater than or equal to the lowest discharge temperature, the hybrid all-terrain vehicle can activate the thermistor based on its maximum available power.

[0134] In some embodiments, the hybrid all-terrain vehicle controls the engine to idle and opens preset valves of the control valve, the first water pump, and the second water pump, causing the water temperature in the engine circuit to rise. Specific embodiments for heating the battery pack via heat exchange equipment can be found in [reference needed]. Figure 5 The embodiment corresponding to step S2410 is described below. For a specific embodiment where the hybrid all-terrain vehicle activates the thermistor based on the maximum available power of the PTC device to heat the battery pack, please refer to [link to embodiment]. Figure 5 The embodiment content corresponding to step S2412.

[0135] S2611: If the lowest temperature of the battery cell is T cellmin Greater than or equal to the minimum charging temperature T Cmin The engine is controlled to operate according to its minimum power output, and preset valves, the first water pump and the second water pump are opened. The thermistor is operated according to its maximum available power, and the battery pack is heated through the heat exchange equipment and the thermistor.

[0136] In some embodiments, the minimum power output of the engine is determined based on the vehicle's electrical power consumption and the battery pack's rechargeable power. For example, the minimum power output of the engine must be less than the sum of the vehicle's electrical power consumption and the battery's rechargeable power.

[0137] In some embodiments, if the lowest cell temperature is determined to be greater than or equal to the lowest charging temperature of the battery pack, it indicates that the battery pack's charging and discharging capabilities have largely returned to normal, and its performance is relatively stable. In this case, since the battery pack's charging and discharging capabilities are guaranteed to a certain extent, there is no need to worry about current flowing into the battery pack damaging its lifespan. To ensure the stability of the battery pack's operation and improve energy efficiency, the hybrid all-terrain vehicle can control the engine's operation based on its minimum power output, open preset valves, the first and second water pumps, and operate the thermistor according to its maximum available power. Heating the battery pack through heat exchange equipment and the thermistor effectively accelerates the heating speed and shortens the heating time. Simultaneously, running the engine provides energy support for vehicle operation, facilitating quick vehicle use by the user.

[0138] S2612: Determining the lowest cell temperature T cellmin With the highest temperature T of the battery cell cellmax Is it within the preset temperature range T? Imin ≤T cellmin ≤T cellmax ≤T Imax Inside.

[0139] S2613: If the lowest temperature of the battery cell is T cellmin With the highest temperature T of the battery cell cellmax Within the preset temperature range, the system controls the engine to stop, the thermistor to stop heating, and the preset valve to close.

[0140] In some embodiments, while controlling engine operation according to the engine's minimum power output, opening preset valves, the first water pump, and the second water pump, and operating the thermistor according to its maximum available power, the hybrid all-terrain vehicle can periodically detect the minimum and maximum cell temperatures of the battery pack during the process of heating the battery pack through the heat exchange equipment and the thermistor. If the minimum and maximum cell temperatures are determined to be within a preset temperature range, it indicates that the battery pack is in optimal operating condition. At this time, the hybrid all-terrain vehicle can control the thermistor to stop heating and close the preset valves, the first water pump, the second water pump, etc., to stop heating the battery pack and prevent overheating.

[0141] In other embodiments, if the lowest or highest cell temperature is less than the lowest cell temperature threshold T Imin The hybrid all-terrain vehicle can continue to control the engine operation according to the minimum power output of the engine, open the preset valves, the first water pump and the second water pump, and operate the thermistor according to the maximum available power of the thermistor. The battery pack is heated through the heat exchange equipment and the thermistor until the minimum temperature and the maximum temperature of the battery cells are within the preset temperature range.

[0142] In other embodiments, if the highest cell temperature is greater than the highest cell temperature threshold T Imax Hybrid all-terrain vehicles can cool the battery pack by controlling the compressor circuit.

[0143] In other embodiments, the hybrid all-terrain vehicle does not limit the method of cooling the battery pack. For example, the hybrid all-terrain vehicle can also cool the engine through the engine cooling circuit, thereby reducing the temperature of the engine circuit and thus assisting in cooling the battery circuit through the engine circuit.

[0144] This application provides a thermal management control method in a rapid heating mode. This method can significantly reduce the heating waiting time, allowing users to quickly use the vehicle, while also improving the performance of the battery pack in low-temperature environments.

[0145] like Figure 7 As shown, the thermal management control method under the economic heating mode includes steps S280 and S281. Step S281 includes S2810 to S2817, and the specific steps are as follows.

[0146] in, Figure 7 China T cellmin Indicates the lowest temperature of the battery cell, T cellmax T represents the highest temperature of the battery cell. Dmin T represents the minimum discharge temperature. Cmin Indicates the minimum charging temperature, T Imin With T Imax T is the preset cell temperature threshold. Imin With T Imax Settings can be customized based on experience or through testing; for example, when the battery module in the battery pack is a lithium battery, T Imin You can take 20℃, T Imax 45°C can be used. This application embodiment addresses T. Imin With T Imax The value of T is not restricted. cellmin With T cellmax Satisfy T Imin ≤T cellmin ≤T cellmax ≤T Imax At that time, the lowest and highest temperatures of the battery cell are within the preset temperature range.

[0147] S280: Set the lowest cell temperature T cellmin With the lowest discharge temperature T Dmin Compare them.

[0148] In some embodiments, the content of step S280 can be referred to as follows: Figure 4 The embodiment of step S28 shown will not be repeated here.

[0149] S281: Determine the lowest cell temperature T cellmin Is it less than the minimum discharge temperature T? Dmin .

[0150] S2810: If the lowest cell temperature T cellmin Less than the minimum discharge temperature T Dmin The system controls the engine to idle and opens the preset valves of the control valve, the first water pump, and the second water pump, causing the water temperature in the engine circuit to rise and heat the battery pack through the heat exchange equipment.

[0151] In some embodiments, under economic mode, if it is determined that the minimum cell temperature of the battery pack is lower than the minimum charging temperature, the hybrid all-terrain vehicle can control the engine to enter idle state and open the preset valve of the control valve, the first water pump, and the second water pump, so that the water temperature in the engine circuit rises, and the battery pack is heated through the heat exchange device. For specific embodiments regarding the hybrid all-terrain vehicle controlling the engine to enter idle state and opening the preset valve of the control valve, the first water pump, and the second water pump to rise the water temperature in the engine circuit and heat the battery pack through the heat exchange device, please refer to... Figure 5 The embodiment of step S210.

[0152] S2811: If the lowest cell temperature T cellmin Greater than or equal to the minimum discharge temperature T Dmin The thermistor is activated based on its maximum available power, and the engine is shut down.

[0153] In some embodiments, the hybrid all-terrain vehicle may obtain the maximum available power of the thermistor by: obtaining the minimum power output of the battery pack and the maximum power output of the thermistor; and determining the maximum available power output of the thermistor based on the minimum power output and the maximum power output.

[0154] In some embodiments, if the lowest cell temperature is greater than or equal to the lowest discharge temperature and less than the lowest charging temperature, it indicates that the battery pack has a certain discharge capacity, and the battery pack can supply power to the thermistor (PTC). In this case, to save costs, the hybrid all-terrain vehicle can activate the thermistor according to its maximum available power, using the thermistor to heat the battery pack and control the engine to shut down.

[0155] Furthermore, if it is necessary to continue heating the battery pack after the hybrid all-terrain vehicle controls the engine to stop, the hybrid all-terrain vehicle can execute step S2812.

[0156] S2812: Determine whether the coolant temperature in the engine circuit is higher than that in the battery circuit.

[0157] S2813: If the water temperature in the engine circuit is higher than that in the battery circuit, the preset valve, the first water pump and the second water pump are opened, and the battery pack is heated through the heat exchange equipment and the thermistor.

[0158] In some embodiments, if the water temperature in the engine circuit is higher than that in the battery circuit, the hybrid all-terrain vehicle can keep the preset valves, the first water pump, and the second water pump open. While heating the battery pack through the thermistor, the battery pack is also heated based on the temperature difference between the engine circuit water temperature and the battery circuit water temperature to save costs.

[0159] In other embodiments, if the engine circuit coolant temperature is lower than or equal to the battery circuit coolant temperature, the hybrid all-terrain vehicle can heat the battery pack using a thermistor.

[0160] S2814: Determine the lowest cell temperature T cellmin Is it greater than or equal to the minimum charging temperature T? Cmin .

[0161] S2815: If the lowest cell temperature T cellmin Greater than or equal to the minimum charging temperature T Cmin The thermistor is controlled to enter the heat preservation mode.

[0162] In some embodiments, when the thermistor is in heat preservation mode, the hybrid all-terrain vehicle can dynamically adjust the minimum and maximum cell temperatures of the battery pack by controlling the operation of the thermistor, so that the minimum and maximum cell temperatures are within a preset temperature range.

[0163] In other embodiments, if the minimum cell temperature is lower than the minimum charging temperature, the hybrid all-terrain vehicle can return to step S2812 to determine whether the engine circuit water temperature is higher than the battery circuit water temperature.

[0164] S2816: Determining the lowest cell temperature T cellmin With the highest temperature T of the battery cell cellmax Is it within the preset temperature range T? Imin ≤T cellmin ≤T cellmax ≤T Imax Inside.

[0165] S2817: If the lowest temperature of the battery cell is T cellmin With the highest temperature T of the battery cell cellmax Within the preset temperature range, the thermistor is controlled to stop maintaining the temperature.

[0166] In some embodiments, during the process of controlling the thermistor to enter the heat preservation mode, the hybrid all-terrain vehicle can periodically detect the minimum and maximum cell temperatures. When it is determined that the minimum and maximum cell temperatures are within a preset temperature range, the hybrid all-terrain vehicle can control the thermistor to stop heat preservation and close preset valves of the control valve, the first water pump, the second water pump, etc., to stop heating the battery pack and avoid overheating of the battery pack.

[0167] In other embodiments, if the lowest or highest cell temperature is less than the lowest cell temperature threshold T Imin Hybrid all-terrain vehicles can dynamically adjust the minimum and maximum cell temperatures of the battery pack by controlling the operation of the thermistor, so that the minimum and maximum cell temperatures are within a preset temperature range.

[0168] In other embodiments, if the highest cell temperature is greater than the highest cell temperature threshold T Imax Hybrid all-terrain vehicles can cool the battery pack by controlling the compressor circuit.

[0169] In other embodiments, the hybrid all-terrain vehicle does not limit the method of cooling the battery pack. For example, the hybrid all-terrain vehicle can also cool the engine through the engine cooling circuit, thereby reducing the temperature of the engine circuit and thus assisting in cooling the battery circuit through the engine circuit.

[0170] This application provides a thermal management control method under an economic heating mode. This method can comprehensively judge heating energy consumption and improve the economy of heating battery packs.

[0171] In the thermal management control method provided in this application embodiment, different heating modes are pre-set to meet different heating needs. Each heating mode corresponds to a different control strategy. During the thermal management control process, the hybrid all-terrain vehicle can determine the heating mode according to preset rules and match the corresponding heating strategy based on the determined heating mode. By coordinating the control of the engine circuit and battery circuit to heat the battery pack based on the matched heating strategy and the battery pack's temperature parameters, thermal management efficiency and energy utilization can be effectively improved.

[0172] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0173] like Figure 8 As shown, in one embodiment of this application, a thermal management control device 200 is provided, applied to a hybrid all-terrain vehicle. The functions of the thermal management control device 200 correspond to the thermal management control method in the above embodiments. The thermal management control device 200 includes a determining module 201, a matching module 202, and a control module 203. The functional modules are described in detail below: The determining module 201 is used to determine a heating mode according to preset rules, including a conventional heating mode, a rapid heating mode, and an economical heating mode; the matching module 202 is used to match a corresponding heating strategy based on the determined heating mode; the control module 203 is used to control the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the temperature parameters of the battery pack.

[0174] Specific limitations regarding the thermal management control device 200 can be found in the limitations of the thermal management control method described above, and will not be repeated here. Each module in the aforementioned thermal management control device 200 can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware within or independently of the thermal management controller in the hybrid all-terrain vehicle, or stored in software within the memory of the hybrid all-terrain vehicle, so that the thermal management controller can call and execute the corresponding operations of each module.

[0175] like Figure 9 As shown in the embodiments of this application, a hybrid all-terrain vehicle 1000 is also provided. The network in which the hybrid all-terrain vehicle 1000 is located includes, but is not limited to, the Internet, wide area network, metropolitan area network, local area network, virtual private network (VPN), etc.

[0176] The hybrid all-terrain vehicle 1000 includes a communication module 1001, a memory 1002, a thermal management controller 1003, an input / output (I / O) interface 1004, and a bus 1005. The thermal management controller 1003 is coupled to the communication module 1001, the memory 1002, and the I / O interface 1004 via the bus 1005.

[0177] The communication module 1001 can be a wireless communication module or a mobile communication module. The wireless communication module can provide solutions for wireless communication used in the hybrid all-terrain vehicle 1000, including Wireless Local Area Networks (WLAN) (e.g., Wireless Fidelity, Wi-Fi), Bluetooth (BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), and Infrared (IR) technologies. The mobile communication module can provide solutions for wireless communication used in the hybrid all-terrain vehicle 1000, including 2G / 3G / 4G / 5G technologies.

[0178] The memory 1002 may include one or more random access memory (RAM) and one or more non-volatile memory (NVM). The RAM can be directly read and written by the thermal management controller 1003, and can be used to store executable programs (such as machine instructions) of the operating system or other running programs, as well as user and application data. The RAM may include static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM, such as fifth-generation DDR SDRAM, generally referred to as DDR5 SDRAM), etc.

[0179] Non-volatile memory can also store executable programs and user and application data, and can be pre-loaded into random access memory for direct reading and writing by the thermal management controller 1003. Non-volatile memory can include disk storage devices and flash memory.

[0180] The memory 1002 is used to store one or more computer programs. The one or more computer programs are configured to be executed by the thermal management controller 1003. The one or more computer programs include multiple instructions that, when executed by the thermal management controller 1003, enable a thermal management control method to be performed on the hybrid all-terrain vehicle 1000.

[0181] In other embodiments, the hybrid all-terrain vehicle 1000 also includes an external memory interface for connecting to an external memory to expand the storage capacity of the hybrid all-terrain vehicle 1000.

[0182] The thermal management controller 1003 may include one or more processing units, such as: an application thermal management controller (AP), a modem thermal management controller, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband thermal management controller, and / or a neural network processing unit (NPU), etc. The different processing units may be independent devices or integrated into one or more thermal management controllers.

[0183] The thermal management controller 1003 provides computing and control capabilities. For example, the thermal management controller 1003 is used to execute computer programs stored in the memory 1002 to implement the thermal management control method described above.

[0184] I / O interface 1004 is used to provide a channel for user input or output. For example, I / O interface 1004 can be used to connect various input and output devices, such as mouse, keyboard, touch device, display screen, etc., so that users can enter information or visualize information.

[0185] Bus 1005 is used at least to provide a channel for communication between the communication module 1001, memory 1002, thermal management controller 1003, and I / O interface 1004 in the hybrid all-terrain vehicle 1000.

[0186] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the hybrid all-terrain vehicle 1000. In other embodiments of this application, the hybrid all-terrain vehicle 1000 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0187] This application also provides a computer-readable storage medium storing a computer program, the computer program including program instructions, and the method implemented when the program instructions are executed can refer to the thermal management control method in the above embodiments of this application.

[0188] The computer-readable storage medium can be the internal storage of the hybrid all-terrain vehicle described in the above embodiments, such as the hard drive or memory of the hybrid all-terrain vehicle. Alternatively, the computer-readable storage medium can be an external storage device of the hybrid all-terrain vehicle, such as a plug-in hard drive, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the hybrid all-terrain vehicle.

[0189] Furthermore, the computer-readable storage medium may primarily include a program storage area and a data storage area, wherein the program storage area may store the operating system, at least one application program required for a function, etc.; and the data storage area may store data created based on the use of the hybrid all-terrain vehicle, etc.

[0190] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A thermal management control method applied to a hybrid all-terrain vehicle, characterized in that, The hybrid all-terrain vehicle includes a thermal management system, which comprises an engine circuit and a battery circuit. The engine circuit includes an engine, a control valve, and a first water pump. The battery circuit includes a battery pack, a thermistor, and a second water pump. The engine circuit and the battery circuit exchange heat through a heat exchange device. The thermal management control method includes: The heating mode is determined according to preset rules, including a conventional heating mode, a rapid heating mode, and an economical heating mode. Based on the determined heating mode, the corresponding heating strategy is matched; Based on the heating strategy and the temperature parameters of the battery pack, the engine circuit and the battery circuit are controlled to heat the battery pack.

2. The thermal management control method as described in claim 1, characterized in that, The temperature parameters include the minimum cell temperature and the minimum discharge temperature. The step of controlling the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the battery pack temperature parameters includes: If the determined heating mode is a conventional heating mode, obtain the minimum discharge temperature and the minimum cell temperature before heating; The minimum discharge temperature is compared with the minimum cell temperature before heating, and the engine circuit and the battery circuit are controlled to heat the battery pack based on the comparison result.

3. The thermal management control method as described in claim 2, characterized in that, The method of controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison results includes: If the minimum cell temperature before heating is lower than the minimum discharge temperature, the engine is controlled to enter idle state, and the preset valve of the control valve, the first water pump and the second water pump are opened, so that the water temperature of the engine circuit rises, the battery pack is heated through the heat exchange device, and the minimum cell temperature when the battery pack is heated is obtained. The preset valve is connected to the battery circuit through the heat exchange device. If the lowest cell temperature during heating is higher than or equal to the lowest discharge temperature, the thermistor is activated according to its maximum available power, and the battery pack is heated by the heat exchange device and the thermistor. If the lowest cell temperature during heating is higher than or equal to the lowest charging temperature, the engine is stopped. When the water temperature in the engine circuit is higher than the water temperature in the battery circuit, the preset valve, the first water pump, and the second water pump are opened, and the battery pack is heated through the heat exchange device and the thermistor until the lowest cell temperature and the highest cell temperature in the battery pack are respectively within the preset temperature range. Then, the thermistor is controlled to stop heating and the preset valve is closed.

4. The thermal management control method as described in claim 3, characterized in that, The method of controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison results includes: If the lowest cell temperature before heating is higher than or equal to the lowest discharge temperature, the thermistor is activated according to its maximum available power, and the battery pack is heated through the thermistor until the lowest cell temperature and the highest cell temperature are respectively within the preset temperature range, at which point the thermistor is controlled to stop heating.

5. The thermal management control method as described in claim 3 or 4, characterized in that, The thermal management control method further includes: Obtain the minimum power output of the battery pack and the maximum power output of the thermistor; The maximum available power of the thermistor is determined based on the minimum power output and the maximum power output.

6. The thermal management control method as described in claim 1, characterized in that, The temperature parameters include the minimum cell temperature and the minimum charging temperature. The step of controlling the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the battery pack temperature parameters includes: If the determined heating mode is a rapid heating mode, obtain the lowest temperature of the battery cell and the lowest charging temperature; The lowest temperature of the battery cell is compared with the lowest charging temperature, and the engine circuit and the battery circuit are controlled to heat the battery pack based on the comparison result.

7. The thermal management control method as described in claim 6, characterized in that, The method of controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison results includes: If the minimum temperature of the battery cell is lower than the minimum charging temperature, the engine is controlled to enter an idling state, and the preset valve of the control valve, the first water pump and the second water pump are opened, so that the water temperature of the engine circuit rises, the battery pack is heated through the heat exchange device, and the thermistor is activated according to the maximum available power of the thermistor, the battery pack is heated through the thermistor, and the preset valve is connected to the battery circuit through the heat exchange device; If the lowest temperature of the battery cell is higher than or equal to the lowest charging temperature, the engine is controlled to operate according to the minimum power output of the engine, the preset valve, the first water pump and the second water pump are opened, and the thermistor is operated according to the maximum available power of the thermistor. The battery pack is heated through the heat exchange equipment and the thermistor until the lowest temperature of the battery cell and the highest temperature of the battery cell in the battery pack are within the preset temperature range. Then, the engine is controlled to stop, the thermistor stops heating and the preset valve is closed. The minimum power output of the engine is determined based on the vehicle power consumption of the hybrid all-terrain vehicle and the chargeable power of the battery pack.

8. The thermal management control method as described in claim 1, characterized in that, The temperature parameters include the minimum cell temperature and the minimum discharge temperature. The step of controlling the engine circuit and the battery circuit to heat the battery pack based on the heating strategy and the battery pack temperature parameters includes: If the determined heating mode is the economic heating mode, obtain the lowest temperature of the battery cell and the lowest discharge temperature; The lowest temperature of the battery cell is compared with the lowest discharge temperature, and the engine circuit and the battery circuit are controlled to heat the battery pack based on the comparison result.

9. The thermal management control method as described in claim 8, characterized in that, The method of controlling the engine circuit and the battery circuit to heat the battery pack based on the comparison results includes: If the minimum temperature of the battery cell is lower than the minimum discharge temperature, the engine is controlled to enter the idling state, and the preset valve of the control valve, the first water pump and the second water pump are opened, so that the water temperature of the engine circuit rises and the battery pack is heated through the heat exchange device. The preset valve is connected to the battery circuit through the heat exchange device. If the lowest temperature of the battery cell is higher than or equal to the lowest discharge temperature, the thermistor is activated according to the maximum available power of the thermistor, and the engine is controlled to stop, while the water temperature of the engine circuit and the water temperature of the battery circuit are detected. If the water temperature in the engine circuit is higher than the water temperature in the battery circuit, the preset valve, the first water pump, and the second water pump are opened, and the battery pack is heated through the heat exchange device and the thermistor until the minimum temperature of the battery cell is higher than or equal to the minimum charging temperature of the battery pack, at which point the thermistor is controlled to enter the heat preservation mode.

10. A hybrid all-terrain vehicle, characterized in that, The device includes a memory, a thermal management controller, and computer-readable instructions stored in the memory and executable on the thermal management controller, wherein the computer-readable instructions, when executed by the thermal management controller, implement the thermal management control method as described in any one of claims 1 to 9.

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