Temperature control method and device for direct current-direct current converter

Abstract

The invention discloses a temperature control method and device of a direct current-direct current converter, which are used for improving the temperature control effectiveness of the direct current-direct current converter. The scheme provided by the invention is applied to the hybrid power system. The method comprises the following steps: monitoring the temperature of a direct current-direct current converter of a target vehicle; if the temperature of the direct current-direct current converter is higher than a first preset temperature, the output voltage of the direct current-direct current converter is adjusted to be a first preset voltage, so that a small storage battery of the target vehicle is controlled to supply power to low-voltage electric equipment of the target vehicle, the first preset voltage is smaller than the output voltage of the small storage battery.

Description

Technical Field

[0001] This application relates to the field of hybrid system control, and more particularly to a method and apparatus for temperature control of a converter. Background Technology

[0002] In the field of hybrid vehicles, DC-DC converters are used to convert high-voltage direct current into low-voltage direct current, thereby providing electrical energy to low-voltage electrical devices in the vehicle. In some cases, the low-voltage electrical energy output from the DC-DC converter can also be used to charge the vehicle's small battery.

[0003] Because DC-DC converters contain electronic components such as transistors, capacitors, and inductors, they generate heat during operation. If heat cannot be dissipated in time, a DC-DC converter operating at high temperatures may malfunction, potentially limiting vehicle functionality or even posing a vehicle safety risk.

[0004] How to improve the temperature control effectiveness of DC-DC converters is the technical problem that this application aims to solve. Summary of the Invention

[0005] The purpose of this application is to provide a temperature control method and apparatus for a DC-DC converter, so as to improve the temperature control effectiveness of the DC-DC converter.

[0006] Firstly, a temperature control method for a DC-DC converter is provided, applicable to a hybrid power system, including: Monitor the temperature of the DC-DC converter in the target vehicle; If the temperature of the DC-DC converter is higher than the first preset temperature, the output voltage of the DC-DC converter is adjusted to the first preset voltage to control the small battery of the target vehicle to supply power to the low-voltage electrical equipment of the target vehicle, wherein the first preset voltage is less than the output voltage of the small battery.

[0007] Secondly, a temperature control device for a DC-DC converter is provided, applicable to a hybrid power system, comprising: The monitoring module monitors the temperature of the DC-DC converter in the target vehicle. The control module adjusts the output voltage of the DC-DC converter to the first preset voltage if the temperature of the DC-DC converter is higher than the first preset temperature, so as to control the small battery of the target vehicle to supply power to the low-voltage electrical equipment of the target vehicle, wherein the first preset voltage is less than the output voltage of the small battery.

[0008] Thirdly, an electronic device is provided, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method of the first aspect.

[0009] Fourthly, a computer-readable storage medium is provided on which a computer program is stored, which, when executed by a processor, implements the steps of the method of the first aspect.

[0010] Fifthly, a computer program product is provided, comprising a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of the method of the first aspect.

[0011] In this embodiment, the temperature of the DC-DC converter in the target vehicle is monitored. If the temperature of the DC-DC converter is higher than a first preset temperature, the output voltage of the DC-DC converter is adjusted to the first preset voltage to control the small battery of the target vehicle to supply power to the low-voltage electrical equipment of the target vehicle. The first preset voltage is lower than the output voltage of the small battery. The solution provided in this embodiment reduces the load on the DC-DC converter by lowering its output voltage, thereby reducing the heat generated by the DC-DC converter and effectively controlling its temperature, preventing abnormal operation due to high temperature. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1a This is a schematic diagram of a hybrid powertrain system. Figure 1b This is one of the schematic flowcharts of a temperature control method for a DC-DC converter according to an embodiment of this application; Figure 1c This is a schematic diagram of a DC-DC converter circuit in a temperature control method for a DC-DC converter according to an embodiment of this application; Figure 2 This is a second schematic flowchart of a temperature control method for a DC-DC converter according to an embodiment of this application; Figure 3 This is the third schematic flowchart of a temperature control method for a DC-DC converter according to an embodiment of this application; Figure 4This is the fourth schematic flowchart of a temperature control method for a DC-DC converter according to an embodiment of this application; Figure 5 This is the fifth of a flowchart illustrating a temperature control method for a DC-DC converter, according to an embodiment of this application. Figure 6 This is a schematic diagram of the structure of a temperature control device for a DC-DC converter, according to one embodiment of this application. Detailed Implementation

[0013] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The drawing numbers in this application are only used to distinguish the various steps in the solution and are not used to limit the execution order of the various steps. The specific execution order is subject to the description in the specification.

[0014] In the field of hybrid system control, hybrid vehicles have high-voltage electrical characteristics. Figure 1a A schematic diagram of a hybrid powertrain system is shown. The system may include a hybrid engine, clutch, motor, torque converter, and transmission. In practical applications, high-voltage electrical modules often generate heat during operation. To ensure these modules operate at their normal operating temperatures, cooling modules are necessary. For example, a high-voltage to low-voltage converter may include a DC-DC converter with water-cooling capabilities. Additionally, various functional modules in the vehicle, such as the generator and OBC (On-Board Charger) system, also require cooling. Cooling methods may include water cooling and air conditioning cooling.

[0015] The aforementioned DC-DC converter can convert high-voltage DC power into low-voltage DC power to supply power to low-voltage loads. If the DC-DC converter overheats during operation, it may cause abnormal output or even stop working. This could lead to the inability to charge the vehicle's small battery or even cause the vehicle's power control system to malfunction. Therefore, temperature control of the DC-DC converter, ensuring it operates within a normal temperature range, is crucial for the stable operation of the vehicle.

[0016] To address the problems existing in related technologies, embodiments of this application provide a temperature control method for a DC-DC converter, applicable to a hybrid powertrain system. For example, the solution provided in this application embodiment can be applied to… Figure 1a The hybrid powertrain system shown should be understood to be applicable to other hybrid powertrain architectures as well. For example... Figure 1b As shown, the method provided in this application embodiment includes: S11: Monitor the temperature of the DC-DC converter in the target vehicle.

[0017] In this step, the temperature of the DC-DC converter can be monitored by the temperature sensor inside the target vehicle. This temperature can be the internal temperature of the DC-DC converter or the ambient temperature of the DC-DC converter.

[0018] Optionally, the aforementioned temperature may be determined by calculating the average value or other statistical methods based on the temperatures monitored by multiple temperature sensors inside the target vehicle.

[0019] S12: If the temperature of the DC-DC converter is higher than the first preset temperature, the output voltage of the DC-DC converter is adjusted to the first preset voltage to control the small battery of the target vehicle to supply power to the low-voltage electrical equipment of the target vehicle. Wherein, the first preset voltage is less than the output voltage of the small storage battery.

[0020] In the solution provided in this application embodiment, the first preset temperature can be set according to the reasonable operating temperature range of the DC-DC converter. Assuming that the upper limit of the operating temperature range of the DC-DC converter is the first operating temperature, then the first preset temperature can be less than or equal to the aforementioned first operating temperature to ensure that the high temperature risk of the DC-DC converter is detected as soon as possible.

[0021] In this step, when the temperature of the DC-DC converter is detected to be higher than the first preset temperature, the output voltage of the DC-DC converter is adjusted to the first preset voltage, which is lower than the output voltage of the small battery. This allows the small battery to use its stored electrical energy to power the low-voltage electrical equipment of the target vehicle, thereby sharing the output pressure of the DC-DC converter.

[0022] In practical applications, DC-DC converters are used to convert high-voltage electricity into low-voltage electricity, and the low-voltage output can power low-voltage electrical equipment. After meeting the power requirements of low-voltage equipment, excess energy can be used to charge small storage batteries.

[0023] The DC-DC converter generates heat during its operation of converting high-voltage electricity to low-voltage electricity, which is one of the reasons for the rise in its own temperature. To address this key reason for the temperature rise caused by the DC-DC converter's own heat generation, the solution provided in this application embodiment adjusts the output voltage of the DC-DC converter to the first preset voltage when the temperature of the DC-DC converter is monitored to be higher than a first preset temperature, so that the output voltage of the DC-DC converter is lower than the output voltage of the small battery.

[0024] Regarding the operating efficiency of the DC-DC converter itself, the reduced output voltage lowers the workload of the DC-DC converter, which in turn reduces the heat generated by the DC-DC converter, thus effectively controlling the temperature of the DC-DC converter in terms of its own heat generation, a key factor.

[0025] In terms of power supply to low-voltage electrical equipment, since the output voltage of the DC-DC converter drops, in order to ensure stable power supply to low-voltage electrical equipment, a small battery shares the output pressure of the DC-DC converter, ensuring that the electrical energy output by the DC-DC converter and the electrical energy output by the small battery together meet the power demand of low-voltage electrical equipment.

[0026] The solution provided in this application effectively reduces the power consumption of the DC-DC converter by adjusting its output voltage, thereby alleviating the overheating problem of the DC-DC converter and ensuring the power supply stability of the low-voltage electrical equipment in the target vehicle.

[0027] The following section will further illustrate this solution using a real-world application scenario.

[0028] If the temperature of the DC-DC converter exceeds a first preset temperature, the power control system can control the DC-DC converter to apply a "BUCK voltage" limit. The output voltage of the DC-DC converter under normal operating conditions is, for example, 14V. In this step, by controlling the "BUCK voltage," the output voltage of the DC-DC converter is reduced from "14V" to "10V," thereby reducing the load on the DC-DC converter and consequently reducing its own heat generation, achieving cooling from the perspective of its own heat generation. By controlling the output voltage of the DC-DC converter, the power supplied from the output of the DC-DC converter to low-voltage electrical equipment is reduced. The power required by this low-voltage electrical equipment is jointly provided by the output of the DC-DC converter and a small battery; that is, the small battery shares the power supply burden of the DC-DC converter.

[0029] In the solution provided in this application, the low-voltage electrical equipment of the target vehicle may include various functional modules such as headlights, audio systems, and in-vehicle displays. The overall power demand of the low-voltage electrical equipment may change at any time according to actual driving needs. In this solution, the heat generation of the DCDC converter is controlled by controlling the output voltage of the DCDC converter. If the power demand of the aforementioned low-voltage electrical equipment changes, a small battery can supplement the power demand not met by the output of the DCDC converter, based on the fixed output power of the DCDC converter.

[0030] Below, in conjunction with Figure 1c Further explanation of DC-DC converters.

[0031] A DC-DC converter is a high-voltage to low-voltage device, and its heat generation is essentially determined by the power load. The core components of a DC-DC converter are inductors, switching transistors, and other electronic devices. Inductors have a power storage function; based on the inductor's constant current characteristic, the power load of the DC-DC converter can be varied by controlling the constant duty cycle of the MOSFET.

[0032] For example, based on Figure 1c The diagram shows a DC-DC converter circuit. Assume the input voltage on the left is Ud = 400V, the switching time is 4 / 5 duty cycle (when the output voltage is 14V), and the current is 5A. Then, the power of the DC-DC converter is P = UI = 400 × 5 × 4 / 5 = 1.6kW.

[0033] With the input voltage on the left side still at Ud=400V, adjusting the on-time of the switching transistor to 3 / 5 duty cycle (when the output voltage is 10V), the current passing through is 5A. Therefore, the power of the DC-DC converter is P=UI=400× 5 ×3 / 5 =1.2kW.

[0034] Therefore, when the input voltage is fixed at Ud=400V, the output voltage of the DC-DC converter can be controlled by adjusting the duty cycle of the switching transistors. Lowering the output voltage reduces the load power of the DC-DC converter, thereby reducing its heat generation and controlling the temperature of the DC-DC converter from the perspective of heat generation.

[0035] Based on the solutions provided in the above embodiments, optionally, such as Figure 2 As shown, after step S12 above, that is, after adjusting the output voltage of the DC-DC converter to the first preset voltage, the method further includes: S21: If the duration for which the temperature of the DC-DC converter is higher than the second preset temperature is longer than the first preset duration, and the power supply voltage of the DC-DC converter is the first power supply voltage, the power generation voltage of the generator of the target vehicle is adjusted to the second preset voltage, and the power supply terminal of the DC-DC converter is switched to the generator. The second preset voltage is less than the first supply voltage.

[0036] The solution provided in the above embodiments controls the heat generated by the output voltage of the DC-DC converter, thereby controlling the overall temperature of the DC-DC converter. However, in some scenarios, the DC-DC converter may continue to overheat due to factors such as high ambient temperature or high temperatures in other modules inside the vehicle.

[0037] In this embodiment, the second preset temperature may be the same as or different from the first preset temperature. If the duration for which the temperature of the DC-DC converter is higher than the second preset temperature is longer than the first preset duration, it indicates that the method of controlling the output voltage of the DC-DC converter has failed to achieve effective temperature control. In this case, the solution provided in this embodiment adjusts the generator voltage of the target vehicle and switches the power supply terminal (i.e., input terminal) of the DC-DC converter to the generator.

[0038] Prior to this step, the power consumption of the DC-DC converter had already been reduced to some extent by lowering its output voltage. Building on this, this step involves controlling the generator's supply voltage to provide a lower voltage to the DC-DC converter's input terminal than the initial supply voltage, thereby reducing the input voltage. This reduces the DC-DC converter's workload from both its output and input terminals; that is, by lowering the output voltage and then further reducing the input voltage, the overall power consumption of the DC-DC converter is reduced, thus further minimizing its heat generation.

[0039] The following example will further illustrate this solution.

[0040] In this embodiment of the application, if the temperature of the DCDC converter is still higher than the second preset temperature and the duration of the high temperature is longer than the first preset duration, the voltage at the output terminal of the generator is controlled, and the input terminal of the DCDC converter is switched to the output terminal of the generator, thereby achieving the purpose of reducing the input terminal voltage of the DCDC converter.

[0041] In this embodiment, the generator's output voltage is adjusted to a second preset voltage, which can be set according to the minimum voltage that the DC-DC converter's input terminal can withstand. For example, if the minimum safe input voltage that the DC-DC converter's input terminal can withstand is 200V, then the generator's output voltage can be adjusted accordingly to 200V. Thus, by switching the DC-DC converter's input terminal to the generator's output terminal, a 200V input voltage can be supplied to the DC-DC converter.

[0042] Furthermore, considering that the generator output voltage may fluctuate in practical applications, the aforementioned second preset voltage can be slightly higher than the minimum voltage that the DCDC converter input terminal can withstand. This ensures that the DCDC converter input voltage remains within the safe voltage range even with slight fluctuations in the generator output voltage, guaranteeing the safe operation of the DCDC converter. For example, based on the minimum safe input voltage of 200V for the DCDC converter, the second preset voltage can be set to 220V. In this way, even if the generator output voltage fluctuates slightly in practical applications, it is highly likely that the DCDC converter input voltage will not fall below 200V, ensuring the safety of the DCDC converter.

[0043] In practical applications, the safe input voltage of the aforementioned DC-DC converter may be related to various factors, and correspondingly, the second preset voltage can be flexibly set. For example, on a 400V platform, the theoretical minimum long-term withstand voltage of the DC-DC converter is 200V, so the second preset voltage can be slightly higher than 200V, set to 220V. On an 800V platform, the theoretical minimum long-term withstand voltage of the DC-DC converter is 400V, so the second preset voltage can be slightly higher than 400V, set to 420V. It should be understood that the aforementioned "20V" safety margin can also be flexibly set according to actual needs, for example, by setting a preset proportion corresponding to the theoretical minimum long-term withstand voltage of the DC-DC converter.

[0044] Based on the solutions provided in the above embodiments, optionally, such as Figure 3 As shown, if the duration for which the temperature of the DC-DC converter is higher than the second preset temperature is greater than the first preset duration, the method further includes: S31: If the power supply terminal of the DC-DC converter is the battery pack of the target vehicle, then switch the power supply terminal of the DC-DC converter from the battery pack to the generator; Wherein, the first supply voltage is the output voltage of the battery pack.

[0045] When the power supply terminal of the DC-DC converter is the output terminal of the battery pack, the power supply terminal of the DC-DC converter is switched from the output terminal of the battery pack to the output terminal of the generator. In the solution provided in this application embodiment, the output voltage of the generator is adjusted based on the output voltage of the battery pack, thereby setting the output voltage of the generator to a lower value than the output voltage of the battery pack. By switching the power supply terminal of the DC-DC converter from the battery pack to the generator, the input voltage of the DC-DC converter is changed from the output voltage of the battery pack to the output voltage of the generator, achieving the purpose of stepping down the input voltage of the DC-DC converter, thereby reducing the power consumption of the DC-DC converter itself, and consequently reducing the heat generated by the DC-DC converter.

[0046] Below, in conjunction with Figure 1c The schematic diagram of the DC-DC converter circuit shown further illustrates this scheme.

[0047] Assuming the input voltage Ud = 400V at the left side of the DC-DC converter, the switching time of the transistor is 3 / 5 duty cycle, the current passing through it is 5A, and the output voltage U0 = 14V, the power of the DC-DC converter P = UI = 400 × 5 × 0.6 = 1.2kW.

[0048] Assuming the input voltage of the DC-DC converter is Ud = 220V, the switching time is 1 / 5 of the duty cycle, the current is 5A, and the output voltage is U0 = 14V, the power of the DC-DC converter is P = UI = 220 × 0.6 × 5 = 0.66kW.

[0049] Therefore, when the output voltage U0 = 14V, comparing the input voltages Ud = 400V and Ud = 220V of the DC-DC converter, it is evident that the lower the input voltage, the lower the power load of the DC-DC converter, and consequently, the lower the heat generation. In the solution provided in this application embodiment, switching from the battery pack's output voltage of 380V to the generator's output voltage of 220V can conveniently and quickly reduce the input voltage of the DC-DC converter, thereby reducing the load on the DC-DC converter and consequently reducing its own heat generation, further achieving the effect of temperature control for the DC-DC converter.

[0050] Based on the solutions provided in the above embodiments, optionally, such as Figure 4 As shown, after step S12 above, that is, after adjusting the output voltage of the DC-DC converter to the first preset voltage, the method further includes: S41: If the duration for which the temperature of the DC-DC converter is higher than the third preset temperature is greater than the second preset duration, monitor the heat-generating module that shares the cooling system with the DC-DC converter; The heating module includes a motor control unit (MCU).

[0051] In the solution provided in this application embodiment, the second preset duration can be the same as the first preset duration, or the second preset duration can be greater than or less than the first preset duration. The third preset temperature can be the same as the first preset temperature or the second preset temperature, or it can be different from the first preset temperature and the second preset temperature.

[0052] In this step, the heat-generating modules that share the cooling system with the DC-DC converter are monitored. The DC-DC converter may utilize water cooling, air cooling, or other cooling systems for heat dissipation. Specifically, the temperature of which heat-generating modules to monitor can be determined based on the heat dissipation structure of the cooling system used by the DC-DC converter. If there are multiple heat-generating modules, their temperatures can be monitored separately, and then the overall temperature of the heat-generating modules can be monitored through averaging or other statistical methods.

[0053] S42: If the temperature of the heating module is higher than the preset temperature of the heating module, control the heating module to reduce power consumption.

[0054] The preset temperature of the heating module can be set according to the corresponding heating module. For example, the preset temperature of the heating module can be set to the upper limit of the normal operating temperature range of the heating module.

[0055] In practical applications, heat-generating modules such as the Motor Control Unit (MCU) may share the same cooling system as the DC-DC converter. Taking a water-cooled system as an example, the water-cooled pipes may be cooled by the heat-generating modules such as the MCU before being cooled again by the DC-DC converter. In this case, cooling resources are applied to both the heat-generating modules such as the MCU and the DC-DC converter. The liquid in the water-cooled pipes often experiences a temperature increase after passing through the heat-generating modules such as the MCU, and the cooling efficiency decreases slightly when it flows through the DC-DC converter.

[0056] In the solution provided in this application embodiment, if the temperature of the heating module is detected to be higher than a second preset temperature, the heating module is controlled to reduce power consumption. Reducing power consumption may include limiting some functions of the heating module to reduce heat generation, or it may include temporarily shutting down the heating module.

[0057] In this step, by controlling the power consumption of the heating module to reduce its power consumption, the cooling resources consumed by the heating module in the cooling system can be reduced, ensuring that the cooling resources reserved for the DC-DC converter can achieve higher cooling efficiency in cooling the DC-DC converter. The solution provided in this application embodiment improves cooling efficiency from outside the DC-DC converter while reducing its own heat generation. Thus, the combined effect of its own heat generation and external cooling jointly achieves temperature control of the DC-DC converter.

[0058] In practical applications, the method for controlling the power consumption of heat-generating modules can be determined based on their actual functions. For example, for an MCU whose temperature exceeds a second preset temperature, the power control system can limit the MCU's functions, which may include disabling EV (Electric Vehicle) drive, disabling motor power generation or consumption, etc. For other heat-generating modules, restrictions can be implemented based on their actual functions to reduce the heat generated by the modules.

[0059] Based on the solutions provided in the above embodiments, optionally, such as Figure 5 As shown, it also includes: S51: If the duration for which the temperature of the DC-DC converter is higher than the fourth preset temperature is greater than the third preset duration, then control the low-voltage power generation module in the hybrid power system to supply power to the low-voltage electrical equipment.

[0060] In the solution provided in this application embodiment, the third preset duration can be the same as the first preset duration, or the third preset duration can be greater than or less than the first preset duration. The fourth preset temperature can be the same as the first preset temperature, the second preset temperature, or the third preset temperature, or it can be different from the first preset temperature, the second preset temperature, and the third preset temperature.

[0061] When the DC-DC converter remains at a high temperature, this step controls the low-voltage power generation module to supply power to the low-voltage electrical equipment. The low-voltage power generation module can include a low-voltage generator, which can output electrical energy directly usable by the low-voltage electrical equipment. For example, if the rated input voltage of the low-voltage electrical equipment is 12V, then the low-voltage power generation module can output 12V of electrical energy to supply the aforementioned low-voltage electrical equipment.

[0062] Among them, the low-voltage power generation module can supply power to low-voltage electrical equipment through the bypass of the DC-DC converter. The power output of the low-voltage power generation module does not need to be converted by the DC-DC converter, which can meet the power demand of low-voltage electrical equipment. Moreover, the DC-DC converter does not need to work, effectively sharing the load of the DC-DC converter, thereby achieving the purpose of temperature control of the DC-DC converter.

[0063] The solution provided in this application, based on a power control system, integrates the internal heat generation of the DC-DC converter and the external heat dissipation of the DC-DC converter to achieve temperature control, effectively improving the effectiveness of temperature control. This solution not only controls the temperature of the DC-DC converter from multiple aspects, including output voltage, input voltage, and heat dissipation efficiency, but also supplies power to low-voltage equipment via a bypass from the DC-DC converter, thereby providing power outside the power supply line where the DC-DC converter is located. This reduces the overall load on the power supply line where the DC-DC converter is located, thus achieving effective temperature control of the DC-DC converter.

[0064] In practical applications, various temperature control steps described in the above embodiments of this application can be executed in stages and at multiple levels according to actual needs. For example, when the DC-DC converter experiences an over-temperature warning, the power control system first controls the output terminal of the DC-DC converter to cut off, causing the DC-DC converter to enter a low-power state. Then, if the over-temperature risk persists, the system enters a high-voltage system BUCK state, achieving secondary protection by controlling the input voltage of the DC-DC converter. Furthermore, if the over-temperature risk still persists, the functions of heat-generating modules such as the MCU that share the heat dissipation system with the DC-DC converter are restricted, providing more heat dissipation resources for the DC-DC converter. Through the solution provided by the embodiments of this application, temperature control is achieved from multiple aspects, including internal heat generation and external heat dissipation of the DC-DC converter, improving the overall temperature control effectiveness of the DC-DC converter.

[0065] In order to solve the problems existing in related technologies, such as Figure 6 As shown, this application embodiment also provides a temperature control device 60 for a DC-DC converter, applied to a hybrid power system. For example, the solution provided in this application embodiment can be applied to... Figure 1a The hybrid powertrain system shown is intended to be applicable to other hybrid powertrain architectures. The device includes: Monitoring module 61 monitors the temperature of the DC-DC converter of the target vehicle; If the temperature of the DC-DC converter is higher than a first preset temperature, the control module 62 adjusts the output voltage of the DC-DC converter to the first preset voltage to control the small battery of the target vehicle to supply power to the low-voltage electrical equipment of the target vehicle, wherein the first preset voltage is less than the output voltage of the small battery.

[0066] Based on the solution provided in the above embodiments, optionally, the device further includes a first power supply control module, the first power supply control module being used for: If the duration for which the temperature of the DC-DC converter is higher than the second preset temperature is longer than the first preset duration, and the power supply voltage of the DC-DC converter is the first power supply voltage, the power generation voltage of the generator of the target vehicle is adjusted to the second preset voltage, and the power supply terminal of the DC-DC converter is switched to the generator, wherein the second preset voltage is less than the first power supply voltage.

[0067] Based on the solutions provided in the above embodiments, optionally, the apparatus provided in this application embodiment further includes a second power supply control module, the second power supply control module being used for: If the power supply terminal of the DC-DC converter is the battery pack of the target vehicle, then the power supply terminal of the DC-DC converter is switched from the battery pack to the generator, wherein the first power supply voltage is the output voltage of the battery pack.

[0068] Based on the solution provided in the above embodiments, optionally, the second preset voltage is greater than the minimum safe input voltage of the DC-DC converter.

[0069] Based on the solutions provided in the above embodiments, optionally, the apparatus provided in this application embodiment further includes a cooling control module, the cooling control module being used for: If the duration for which the temperature of the DC-DC converter is higher than the third preset temperature is longer than the second preset duration, the system monitors the heating module that shares the cooling system with the DC-DC converter. The heating module includes a motor control unit (MCU). If the temperature of the heating module is higher than the preset temperature of the heating module, the system controls the heating module to reduce its power consumption.

[0070] Based on the solutions provided in the above embodiments, optionally, the apparatus provided in this application embodiment further includes a low-voltage power generation control module, the low-voltage power generation control module being used for: If the duration for which the temperature of the DC-DC converter is higher than the fourth preset temperature is longer than the third preset duration, then the low-voltage power generation module in the hybrid power system is controlled to supply power to the low-voltage electrical equipment.

[0071] In this application, the modules in the apparatus provided can also implement the method steps provided in the method embodiments. Alternatively, the apparatus provided in this application may include other modules besides those described above to implement the method steps provided in the method embodiments. Furthermore, the apparatus provided in this application can achieve the technical effects achievable by the method embodiments.

[0072] Preferably, this application embodiment also provides an electronic device, including a processor, a memory, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, it implements the various processes of the above-described embodiment of the temperature control method for a DC-DC converter and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0073] This application also provides a computer-readable storage medium storing a computer program. When executed by a processor, this computer program implements the various processes of the above-described embodiment of the temperature control method for a DC-DC converter, achieving the same technical effect. To avoid repetition, it will not be described again here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0074] This application also provides a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program. The computer program is operable to cause a computer to perform some or all of the steps of the above-described embodiment of the temperature control method for a DC-DC converter, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0075] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0076] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0077] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0078] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0079] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0080] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0081] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0082] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0083] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0084] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A temperature control method for a DC-DC converter, characterized in that, Applied to hybrid powertrain systems, including: Monitor the temperature of the DC-DC converter in the target vehicle; If the temperature of the DC-DC converter is higher than the first preset temperature, the output voltage of the DC-DC converter is adjusted to the first preset voltage to control the small battery of the target vehicle to supply power to the low-voltage electrical equipment of the target vehicle, wherein the first preset voltage is less than the output voltage of the small battery.

2. The method as described in claim 1, characterized in that, After adjusting the output voltage of the DC-DC converter to a first preset voltage, the method further includes: If the duration for which the temperature of the DC-DC converter is higher than the second preset temperature is longer than the first preset duration, and the power supply voltage of the DC-DC converter is the first power supply voltage, the power generation voltage of the generator of the target vehicle is adjusted to the second preset voltage, and the power supply terminal of the DC-DC converter is switched to the generator, wherein the second preset voltage is less than the first power supply voltage.

3. The method as described in claim 2, characterized in that, If the duration for which the temperature of the DC-DC converter is above the second preset temperature is greater than the first preset duration, the method further includes: If the power supply terminal of the DC-DC converter is the battery pack of the target vehicle, then the power supply terminal of the DC-DC converter is switched from the battery pack to the generator, wherein the first power supply voltage is the output voltage of the battery pack.

4. The method as described in claim 2 or 3, characterized in that, The second preset voltage is greater than the minimum safe input voltage of the DC-DC converter.

5. The method according to any one of claims 1 to 3, characterized in that, After adjusting the output voltage of the DC-DC converter to a first preset voltage, the method further includes: If the duration for which the temperature of the DC-DC converter is higher than the third preset temperature is greater than the second preset duration, the system monitors the heat-generating module that shares the cooling system with the DC-DC converter. The heat-generating module includes a motor control unit (MCU). If the temperature of the heating module is higher than the preset temperature of the heating module, the power consumption of the heating module will be reduced.

6. The method according to any one of claims 1 to 3, characterized in that, Also includes: If the duration for which the temperature of the DC-DC converter is higher than the fourth preset temperature is longer than the third preset duration, then the low-voltage power generation module in the hybrid power system is controlled to supply power to the low-voltage electrical equipment.

7. A temperature control device for a DC-DC converter, applied to a hybrid power system, comprising: The monitoring module monitors the temperature of the DC-DC converter in the target vehicle. The control module adjusts the output voltage of the DC-DC converter to the first preset voltage if the temperature of the DC-DC converter is higher than the first preset temperature, so as to control the small battery of the target vehicle to supply power to the low-voltage electrical equipment of the target vehicle, wherein the first preset voltage is less than the output voltage of the small battery.

8. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the method as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the method as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform the steps of the method as described in any one of claims 1 to 6.

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