Energy supply method, controller, readable storage medium and hybrid vehicle

Abstract

The present disclosure relates to a power supply method, a controller, a readable storage medium and a hybrid vehicle. The power supply method comprises: obtaining a wheel end demand power of the hybrid vehicle and a temperature value of a bidirectional DC / DC converter when the hybrid vehicle is in an electric driving mode, the bidirectional DC / DC converter being configured to supply electric energy of a power battery of the hybrid vehicle to a driving motor; determining an output power of the bidirectional DC / DC converter according to the wheel end demand power and the temperature value; and controlling the bidirectional DC / DC converter to convert the electric energy according to the output power so as to supply the electric energy of the power battery to the driving motor. In this way, the output power limit value of the bidirectional DC / DC converter is increased to make the power battery supply more electric energy to the driving motor under the condition of ensuring safe operation, so as to meet the power demand of working conditions as much as possible, reduce the starting times of the engine, reduce fuel consumption and improve user satisfaction.

Description

Technical Field

[0001] This disclosure relates to the field of hybrid electric vehicle control technology, and more specifically, to a power supply method, a controller, a readable storage medium, and a hybrid electric vehicle. Background Technology

[0002] Hybrid electric vehicles operate in either pure electric (EV) or hybrid electric (HEV) driving modes. When selecting EV mode, drivers of hybrid vehicles typically want to utilize battery power as much as possible, that is, to use the battery's electricity via bidirectional DC to meet the operating demands of the vehicle's drive motor, reducing engine operating time and thus lowering fuel consumption. However, limitations in the output power design of the battery and bidirectional DC in related technologies can easily lead to insufficient power output for certain high-power-demand conditions, such as those requiring increased power in forced EV mode, resulting in user complaints. Summary of the Invention

[0003] The primary objective of this disclosure is to provide a power supply method, controller, readable storage medium, and hybrid electric vehicle to address problems in the related art.

[0004] To achieve the above objectives, according to a first aspect of the present disclosure, a power supply method is provided, comprising:

[0005] When the hybrid vehicle is in pure electric driving mode, the wheel-end power demand of the hybrid vehicle and the temperature value of the bidirectional DC / DC converter are obtained. The bidirectional DC / DC converter is used to supply the power energy of the hybrid vehicle's power battery to the drive motor.

[0006] The output power of the bidirectional DC / DC converter is determined based on the required power at the wheel end and the temperature value.

[0007] The bidirectional DC / DC converter is controlled according to the output power to perform power conversion so as to provide the power battery with the drive motor.

[0008] Optionally, determining the output power of the bidirectional DC / DC converter based on the required power at the wheel end and the temperature value includes:

[0009] The required power at the wheel end is compared with a preset power range, and the temperature value is compared with a preset first temperature value to obtain a comparison result. The preset power range is from a first power limit to a second power limit, and the first power limit is less than the second power limit.

[0010] Based on the comparison results, the first power limit or the second power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

[0011] Optionally, setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes:

[0012] When the power demand at the wheel end is less than the first power limit, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

[0013] Optionally, setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes:

[0014] When the required power at the wheel end is within the preset power range and the temperature value is less than the preset first temperature value, the second power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

[0015] Optionally, setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes:

[0016] When the power demand at the wheel end exceeds the second power limit, the engine of the hybrid vehicle is started to drive the generator of the hybrid vehicle to provide power to the drive motor, and the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

[0017] Optionally, setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes:

[0018] When the power demand at the wheel end is within the preset power range and the temperature value is greater than or equal to the preset first temperature value, the engine of the hybrid vehicle is started so that the generator of the hybrid vehicle drives the engine to provide power to the drive motor, and the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

[0019] Optionally, the method further includes:

[0020] The required power at the wheel end is compared with a third power limit, and the temperature value is compared with a preset second temperature value, wherein the third power limit is less than the first power limit, and the preset second temperature value is less than the preset first temperature value.

[0021] When the required power at the wheel end is less than the third power limit and the temperature value is less than the preset second temperature value, the engine is shut down.

[0022] Optionally, the method further includes:

[0023] When the temperature value is greater than the preset first temperature value, the speed of the pump in the cooling system of the hybrid vehicle is increased, or the speed of the cooling fan in the cooling system of the hybrid vehicle is increased, in order to cool down the bidirectional DC / DC converter.

[0024] According to a second aspect of the present disclosure, a controller is provided, comprising:

[0025] A memory on which computer programs are stored;

[0026] A processor for executing the computer program in the memory to implement the steps of the power supply method provided in the first aspect of this disclosure.

[0027] According to a third aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the power supply method provided in the first aspect of the present disclosure.

[0028] According to a fourth aspect of the present disclosure, a hybrid electric vehicle is provided, comprising: a controller, a drive motor, a power battery, a bidirectional DC / DC converter, and a temperature sensor, wherein the drive motor and the power battery are both electrically connected to the bidirectional DC / DC converter, and the drive motor, the power battery, the bidirectional DC / DC converter, and the temperature sensor are all electrically connected to the controller, and the temperature sensor is disposed near the bidirectional DC / DC converter;

[0029] The controller is used to execute the power supply method provided in the first aspect of this disclosure.

[0030] The above technical solution can achieve at least the following technical effects:

[0031] When a hybrid vehicle is in pure electric driving mode, the system acquires the wheel-end power demand and the temperature of the bidirectional DC / DC converter. Based on these parameters, the output power of the converter is determined, and the converter is then controlled to convert electrical energy from the battery to power the drive motor. Since the output power of the converter can be set more rationally based on the wheel-end power demand and temperature (this output power could be, for example, a power limit for the converter), controlling the battery's power supply to the drive motor with this output power allows for optimal use of battery power to meet wheel-end power demands while ensuring safe operation. This reduces engine starts, lowers fuel consumption, and improves user satisfaction.

[0032] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a block diagram illustrating a DC protection module according to an exemplary embodiment;

[0035] Figure 2 This is a block diagram illustrating a hybrid electric vehicle according to an exemplary embodiment;

[0036] Figure 3 This is a flowchart illustrating a power supply method according to an exemplary embodiment;

[0037] Figure 4 This is illustrated according to an exemplary embodiment. Figure 3 A flowchart of the sub-steps of step S2 in the process;

[0038] Figure 5 This is illustrated according to an exemplary embodiment. Figure 4 A flowchart of the sub-steps of step S22 in the process;

[0039] Figure 6 This is a block diagram illustrating a power supply device according to an exemplary embodiment.

[0040] Explanation of reference numerals in the attached figures:

[0041] 110-Bidirectional DC / DC converter; 120-Temperature sensor; 130-Power battery; 140-Drive motor; 150-Engine; 160-Generator; 170-Cooling system; 300-Power supply device; 301-Acquisition module; 302-Output power determination module; 303-Power conversion module. Detailed Implementation

[0042] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0043] In the following description, the words "first" and "second" are used only to distinguish the purpose of the description and should not be interpreted as indicating or implying relative importance or order.

[0044] Before introducing the specific embodiments of this disclosure, the application scenario of this disclosure will first be explained. When selecting EV mode, users of hybrid electric vehicles hope to make the most of battery energy and reduce engine operating time to reduce vehicle fuel consumption; the power battery uses bidirectional DC to boost voltage to meet the operating requirements of the drive motor. Existing models mainly have the following disadvantages;

[0045] 1. For example Figure 1 As shown, existing "DC protection modules" protect DC from severe fluctuations and overloads by monitoring voltage or current signals. However, they do not consider that DC's physical characteristics affect its working capacity at different temperatures. At low temperatures, the allowable current of DC increases, and the allowable output power also increases. At high temperatures, its working capacity decreases. In most cases, the operating temperature of DC is not high, so it cannot fully utilize the working capacity of the power battery and bidirectional DC.

[0046] 2. In forced EV mode, due to the limitations of the power battery and bidirectional DC output power, the power output in some operating conditions with high power demand cannot meet the user's needs, which may easily cause user complaints or even danger.

[0047] 3. Insufficient power in EV mode often occurs during short-duration conditions such as rapid acceleration and continuous overtaking at high speeds. If the engine is frequently started and stopped, it defeats the purpose of the user's choice of EV mode and can easily increase fuel consumption, cause noise, vibration, and harshness (NVH) problems, and lead to user complaints.

[0048] To address the aforementioned issues, this disclosure provides a power supply method, controller, readable storage medium, and hybrid electric vehicle. The method controls the power supply from the power battery to the drive motor by determining the output power of the bidirectional DC / DC converter based on the wheel-end power demand and the temperature value of the bidirectional DC / DC converter. While ensuring safe operation, this increases the output power limit of the bidirectional DC / DC converter, allowing the power battery to supply more power to the drive motor, thus meeting the power requirements under operating conditions as much as possible, reducing engine starts, lowering fuel consumption, and improving user satisfaction.

[0049] The power supply method disclosed herein can be applied to the controller of a hybrid electric vehicle. Please refer to [link / reference]. Figure 2 , Figure 2 This is a block diagram illustrating a hybrid electric vehicle according to an exemplary embodiment. The hybrid electric vehicle includes a controller, a bidirectional DC / DC converter 110, a temperature sensor 120, a power battery 130, and a drive motor 140. The drive motor 140 and the power battery 130 are both electrically connected to the bidirectional DC / DC converter 110. The drive motor 140, the power battery 130, the bidirectional DC / DC converter 110, and the temperature sensor 120 are all electrically connected to the controller. The temperature sensor 120 is located near the bidirectional DC / DC converter 110. Figure 2 (As shown by the dashed line). The controller can be a vehicle controller.

[0050] The bidirectional DC / DC converter 110 is electrically connected to the power battery 130 and the drive motor 140, and is used to convert the electrical energy of the power battery 130 into electrical energy and supply it to the drive motor 140.

[0051] Temperature sensor 120 is electrically connected to the controller and positioned near bidirectional DC / DC converter 110. Under the control of the controller, it detects the temperature value of bidirectional DC / DC converter 110 and transmits it to the controller. Temperature sensor 120 can be a contact temperature sensor or a non-contact temperature sensor. When the temperature sensor 120 is a contact temperature sensor, it is in contact with the bidirectional DC / DC converter 110. The contact temperature sensor 120 can be a resistive type, a thermocouple, a PN junction temperature sensor, etc. When the temperature sensor 120 is a non-contact temperature sensor, there is a certain distance between the non-contact temperature sensor 120 and the bidirectional DC / DC converter 110. The non-contact temperature sensor 120 can be an infrared temperature sensor.

[0052] In one possible implementation, the hybrid vehicle may further include an engine 150, a generator 160, and a cooling system 170, wherein the engine 150, generator 160, and drive motor 140 are electrically connected in sequence, and the engine 150, generator 160, and cooling system 170 are all electrically connected to a controller. The cooling system 170 is equipped with a near-bidirectional DC / DC converter 110. Figure 2 (As shown by the dashed line).

[0053] The engine 150 is used to provide additional power when the power supplied to the drive motor 140 by the power battery 130 after passing through the bidirectional DC / DC converter 110 is insufficient to meet the power demand, thereby driving the generator 160 to provide power to the drive motor 140.

[0054] The cooling system 170 is electrically connected to the controller and is located near the bidirectional DC / DC converter 110 to cool the bidirectional DC / DC converter 110 under the control of the controller.

[0055] It should be understood that, Figure 2 The structure shown is only a block diagram of a hybrid electric vehicle; hybrid electric vehicles may also include more... Figure 2 The more or fewer components shown, or having the same Figure 2 The different configurations shown. Figure 2 The components shown can be implemented using hardware, software, or a combination thereof.

[0056] Based on the hybrid electric vehicle described above, the following is a possible implementation method for its power supply. The controller of the hybrid electric vehicle is the implementer of this method. Please refer to [link / reference]. Figure 3 , Figure 3 This is a flowchart illustrating a power supply method according to an exemplary embodiment. The power supply method may include the following steps:

[0057] Step S1: When the hybrid vehicle is in pure electric driving mode, the wheel-end power demand of the hybrid vehicle and the temperature value of the bidirectional DC / DC converter 110 are obtained. The bidirectional DC / DC converter 110 is used to supply the power energy of the hybrid vehicle's power battery 130 to the drive motor 140.

[0058] The wheel-end power requirement can be determined based on vehicle operating status information such as throttle opening, vehicle speed, and gradient to meet the overall vehicle requirements. The temperature value of the bidirectional DC / DC converter 110 can be detected by a temperature sensor 120 located near the bidirectional DC / DC converter 110.

[0059] Step S2: Determine the output power of the bidirectional DC / DC converter 110 based on the required power at the wheel end and the temperature value.

[0060] Step S3: Control the bidirectional DC / DC converter 110 to perform power conversion according to the output power so as to supply the power energy of the power battery 130 to the drive motor 140.

[0061] Because the bidirectional DC / DC converter 110's physical characteristics affect its operating capability at different temperatures, its allowable current and output power increase at low temperatures, while its operating capability and output power decrease at high temperatures. Specifically, the maximum output power of the bidirectional DC / DC converter 110 varies with its temperature; generally, the higher the temperature, the lower the maximum output power. To ensure stability during hybrid vehicle operation, the minimum maximum output power of the bidirectional DC / DC converter 110 is typically defined as the output power at the highest temperature during hybrid vehicle operation. This minimum maximum output power is used as the limit during daily operation to ensure the bidirectional DC / DC converter 110's operational stability throughout the entire operation process.

[0062] If the power demand at the wheel end exceeds the minimum value of the maximum output power, the engine 150 will start to drive the generator 160 to supply power to the drive motor 140, providing additional power. Therefore, the engine 150 starts frequently, resulting in low user satisfaction.

[0063] By taking into account the temperature of the bidirectional DC / DC converter 110, when the temperature of the bidirectional DC / DC converter 110 is low, the actual output power of the bidirectional DC / DC converter 110 can be increased, allowing the bidirectional DC / DC converter 110 to output overpower, meet more operating conditions, and reduce the number of startups.

[0064] Through the above technical solution, since the output power of the bidirectional DC / DC converter 110 can be set more reasonably according to the power demand at the wheel end and the temperature value of the bidirectional DC / DC converter 110 (the output power can be, for example, the output power limit of the bidirectional DC / DC converter 110), the power battery 130 can be used to control the power supply of the drive motor 140 by the output power, so as to meet the power demand at the wheel end as much as possible while ensuring safe operation, reducing the number of times the engine 150 is started, reducing fuel consumption, and improving user satisfaction.

[0065] In one possible implementation, please refer to Figure 4 Step S2 may include the following sub-steps:

[0066] Sub-step S21 compares the required power at the wheel end with the preset power range and the temperature value with the preset first temperature value to obtain the comparison result. The preset power range is from the first power limit to the second power limit, and the first power limit is less than the second power limit.

[0067] The first power limit can be the minimum maximum output power of the bidirectional DC / DC converter 110. The second power limit can be the maximum maximum output power of the bidirectional DC / DC converter 110. The maximum output power of the bidirectional DC / DC converter 110 changes with the temperature of the bidirectional DC / DC converter 110; generally, the higher the temperature of the bidirectional DC / DC converter 110, the lower its maximum output power. The first temperature value can be the temperature of the bidirectional DC / DC converter 110 when its maximum output power is at its maximum value.

[0068] Comparing the required power at the wheel end with the preset power range will result in three possible outcomes: first, the required power at the wheel end is less than the first power limit; second, the required power at the wheel end is within the preset power range; and third, the required power at the wheel end is greater than the second power limit.

[0069] Comparing the temperature value with the preset first temperature value will result in two possible outcomes: either the temperature value is less than the preset first temperature value, or the temperature value is greater than the preset first temperature value.

[0070] The comparison results are the combination of the three possible results and the two possible results mentioned above.

[0071] Sub-step S22: Based on the comparison results, set the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0072] When the power demand at the wheel end is less than the first power limit and the temperature value is less than the preset first temperature value, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0073] When the power demand at the wheel end is less than the first power limit and the temperature value is greater than the preset first temperature value, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0074] When the power demand at the wheel end is within the preset power range and the temperature value is less than the preset first temperature value, the second power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0075] When the power demand at the wheel end is within the preset power range and the temperature value is greater than the preset first temperature value, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0076] When the power demand at the wheel end is greater than the second power limit and the temperature value is less than the preset first temperature value, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0077] When the power demand at the wheel end exceeds the second power limit and the temperature exceeds the preset first temperature value, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0078] In other words, under the original operating mode, if the power demand at the wheel end exceeds the first power limit, additional power is required to start the engine 150 to drive the generator 160 to provide electrical energy to the drive motor 140. However, in one of the comparative results, the second power limit, which is greater than the first power limit, is set as the upper limit of the output power of the bidirectional DC / DC converter 110, which can meet the power demand under this condition without starting the engine 150, thus saving fuel consumption and improving user satisfaction.

[0079] In one possible implementation, please refer to Figure 5 Sub-step S22 may include the following sub-steps:

[0080] Sub-step S221: When the power demand at the wheel end is less than the first power limit, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0081] When the power demand at the wheel end is small and less than the first power limit, the output power of the bidirectional DC / DC converter 110 is sufficient to supply it. At this time, it is not affected by the temperature value of the bidirectional DC / DC converter 110. The first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110, which can meet the power demand of the working condition.

[0082] Sub-step S222: When the power demand at the wheel end is within a preset power range and the temperature value is less than the preset first temperature value, the second power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0083] When the power demand at the wheel end is between the first power limit and the second power limit, and the temperature value is less than the preset first temperature value, the second power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110, so that the bidirectional DC / DC converter 110 can output overpower to meet the power demand of the working condition.

[0084] In sub-step S223, when the power demand at the wheel end is greater than the second power limit, the engine 150 of the hybrid vehicle is started so that the generator 160 of the hybrid vehicle is driven by the engine 150 to provide power to the drive motor 140, and the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0085] When the power demand at the wheel end is high, exceeding the second power limit, the output power of the bidirectional DC / DC converter 110 is completely insufficient. This is unaffected by the temperature of the bidirectional DC / DC converter 110. The hybrid vehicle's engine 150 must be started to provide additional power, which drives the hybrid vehicle's generator 160 to supply electricity to the drive motor 140. Only through the coordinated operation of the bidirectional DC / DC converter 110 and the engine 150 can the power demand be met. In this case, it is sufficient to keep the bidirectional DC / DC converter 110 in a safe environment and ensure stable operation, setting the first power limit as the upper limit of the bidirectional DC / DC converter 110's output power.

[0086] In sub-step S224, when the power demand at the wheel end is within a preset power range and the temperature value is greater than or equal to a preset first temperature value, the engine 150 of the hybrid vehicle is started so that the generator 160 of the hybrid vehicle driven by the engine 150 can provide power to the drive motor 140, and the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0087] When the power demand at the wheel end is between the first and second power limits, and the temperature exceeds the preset first temperature value, the output power of the bidirectional DC / DC converter 110 is insufficient to provide a stable supply. The hybrid vehicle's engine 150 must be started to provide additional power, which drives the hybrid vehicle's generator 160 to supply electrical energy to the drive motor 140. Only through the cooperation of the bidirectional DC / DC converter 110 and the engine 150 can the power demand under operating conditions be met. In this case, it is sufficient to keep the bidirectional DC / DC converter 110 in a safe environment and ensure stable operation; the first power limit is set as the upper limit of the bidirectional DC / DC converter 110's output power.

[0088] In one possible implementation, after sub-step S223 or sub-step S224, the power supply method further includes: shutting down the engine 150. The specific steps are as follows:

[0089] The required power at the wheel end is compared with the third power limit, and the temperature value is compared with the preset second temperature value. The third power limit is less than the first power limit, and the preset second temperature value is less than the preset first temperature value.

[0090] When the power demand at the wheel end is less than the third power limit and the temperature is less than the preset second temperature value, the engine is shut down by 150.

[0091] The third power limit and the preset second temperature value are pre-set limits that allow the engine 150 to be shut down. If the third power limit is less than the first power limit, the preset second temperature value is less than the preset first temperature value, the wheel-end power demand is less than the third power limit, and the temperature value is less than the preset second temperature value, it indicates that the wheel-end power demand has decreased and the bidirectional DC / DC converter 110 is operating stably. At this time, the engine 150 can be shut down to save fuel consumption.

[0092] In one possible implementation, the power supply method further includes:

[0093] When the temperature value exceeds the preset first temperature value, the speed of the pump in the cooling system 170 of the hybrid vehicle is increased, or the speed of the cooling fan in the cooling system 170 of the hybrid vehicle is increased, in order to cool down the bidirectional DC / DC converter 110.

[0094] The cooling system 170 is configured to cool the bidirectional DC / DC converter 110. Specifically, by setting the cooling system 170 to increase the pump speed or the cooling fan speed when the temperature of the bidirectional DC / DC converter 110 exceeds a preset first temperature value, the bidirectional DC / DC converter 110 is cooled to maintain its temperature at or below the preset first temperature value. In many cases, this allows the second power limit to be set as the upper limit of the output power of the bidirectional DC / DC converter 110, reducing the number of engine starts 150, lowering fuel consumption, and improving user satisfaction.

[0095] To implement the above-described method embodiments, this embodiment provides a power supply device, such as... Figure 6 As shown, Figure 6 This is a block diagram illustrating an exemplary embodiment of a power supply device. The power supply device 300 may include an acquisition module 301, an output power determination module 302, and a power conversion module 303.

[0096] The acquisition module 301 is used to acquire the wheel-end power demand of the hybrid vehicle and the temperature value of the bidirectional DC / DC converter 110 when the hybrid vehicle is in pure electric driving mode. The bidirectional DC / DC converter 110 is used to supply the power energy of the power battery 130 of the hybrid vehicle to the drive motor 140.

[0097] The output power determination module 302 is used to determine the output power of the bidirectional DC / DC converter 110 based on the required power at the wheel end and the temperature value.

[0098] The power conversion module 303 is used to control the bidirectional DC / DC converter 110 to perform power conversion according to the output power so as to provide the power energy of the power battery 130 to the drive motor 140.

[0099] Optionally, the output power determination module 302 includes a first determination submodule and a second determination submodule.

[0100] The first determining submodule is used to compare the required power at the wheel end with a preset power range, and compare the temperature value with a preset first temperature value to obtain a comparison result. The preset power range is from a first power limit to a second power limit, and the first power limit is less than the second power limit.

[0101] The second determining submodule is used to set the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter 110 based on the comparison result.

[0102] Optionally, the second determining submodule is specifically used to: when the power demand at the wheel end is less than the first power limit, set the first power limit as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0103] Optionally, the second determining submodule is further configured to: when the required power at the wheel end is within the preset power range and the temperature value is less than the preset first temperature value, set the second power limit as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0104] Optionally, the second determining submodule is further configured to: when the power demand at the wheel end is greater than the second power limit, start the engine 150 of the hybrid vehicle so that the generator 160 of the hybrid vehicle drives the engine 150 to provide electrical energy to the drive motor 140, and set the first power limit as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0105] Optionally, the second determining submodule is further configured to: when the wheel end power demand is within the preset power range and the temperature value is greater than or equal to the preset first temperature value, start the engine 150 of the hybrid vehicle so that the generator 160 of the hybrid vehicle drives the engine 150 to provide power to the drive motor 140, and set the first power limit as the upper limit of the output power of the bidirectional DC / DC converter 110.

[0106] Optionally, the power supply device further includes an engine shutdown module 150, which is used to: compare the wheel end power demand with a third power limit, and compare the temperature value with a preset second temperature value, wherein the third power limit is less than a first power limit, and the preset second temperature value is less than a preset first temperature value; when the wheel end power demand is less than the third power limit and the temperature value is less than the preset second temperature value, the engine 150 is shut down.

[0107] Optionally, the power supply device further includes a cooling module, which is used to: increase the speed of the pump of the cooling system 170 of the hybrid vehicle or increase the speed of the cooling fan of the cooling system 170 of the hybrid vehicle when the temperature value is greater than the preset first temperature value, so as to cool down the bidirectional DC / DC converter 110.

[0108] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0109] This disclosure also provides a controller, which includes a processor and a memory. The memory is used to store a computer program, and the processor is used to execute the computer program to perform the steps of any of the above-described power supply methods.

[0110] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, which, when executed by a processor, implement the steps of the power supply method described above.

[0111] This disclosure also provides a hybrid electric vehicle, including: a controller, a drive motor 140, a power battery 130, a bidirectional DC / DC converter 110, and a temperature sensor 120. The drive motor 140 and the power battery 130 are both electrically connected to the bidirectional DC / DC converter 110. The drive motor 140, the power battery 130, the bidirectional DC / DC converter 110, and the temperature sensor 120 are all electrically connected to the controller. The temperature sensor 120 is disposed near the bidirectional DC / DC converter 110. The controller is used to execute any of the above-described power supply methods.

[0112] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and all such simple modifications are within the protection scope of this disclosure.

[0113] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0114] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A power supply method, characterized in that, The method includes: When the hybrid vehicle is in pure electric driving mode, the wheel-end power demand of the hybrid vehicle and the temperature value of the bidirectional DC / DC converter are obtained. The bidirectional DC / DC converter is used to supply the power energy of the hybrid vehicle's power battery to the drive motor. The output power of the bidirectional DC / DC converter is determined based on the required power at the wheel end and the temperature value. The bidirectional DC / DC converter is controlled according to the output power to perform power conversion so as to provide the power battery with the drive motor; The step of determining the output power of the bidirectional DC / DC converter based on the required power at the wheel end and the temperature value includes: The required power at the wheel end is compared with a preset power range, and the temperature value is compared with a preset first temperature value to obtain a comparison result. The preset power range is from a first power limit to a second power limit, and the first power limit is less than the second power limit. Based on the comparison results, the first power limit or the second power limit is set as the upper limit of the output power of the bidirectional DC / DC converter; The preset first temperature value is the temperature value of the bidirectional DC / DC converter when the maximum output power of the bidirectional DC / DC converter is at its maximum value. The first power limit is the minimum value of the maximum output power of the bidirectional DC / DC converter; The second power limit is the maximum value of the maximum output power of the bidirectional DC / DC converter.

2. The method according to claim 1, characterized in that, The step of setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes: When the power demand at the wheel end is less than the first power limit, the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

3. The method according to claim 1, characterized in that, The step of setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes: When the required power at the wheel end is within the preset power range and the temperature value is less than the preset first temperature value, the second power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

4. The method according to claim 1, characterized in that, The step of setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes: When the power demand at the wheel end exceeds the second power limit, the engine of the hybrid vehicle is started to drive the generator of the hybrid vehicle to provide power to the drive motor, and the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

5. The method according to claim 1, characterized in that, The step of setting the first power limit or the second power limit as the upper limit of the output power of the bidirectional DC / DC converter based on the comparison result includes: When the power demand at the wheel end is within the preset power range and the temperature value is greater than or equal to the preset first temperature value, the engine of the hybrid vehicle is started so that the generator of the hybrid vehicle drives the engine to provide power to the drive motor, and the first power limit is set as the upper limit of the output power of the bidirectional DC / DC converter.

6. The method according to claim 4 or 5, characterized in that, The method further includes: The required power at the wheel end is compared with a third power limit, and the temperature value is compared with a preset second temperature value, wherein the third power limit is less than the first power limit, and the preset second temperature value is less than the preset first temperature value. When the required power at the wheel end is less than the third power limit and the temperature value is less than the preset second temperature value, the engine is shut down.

7. The method according to claim 1, characterized in that, The method further includes: When the temperature value is greater than the preset first temperature value, the speed of the pump in the cooling system of the hybrid vehicle is increased, or the speed of the cooling fan in the cooling system of the hybrid vehicle is increased, in order to cool down the bidirectional DC / DC converter.

8. A controller, characterized in that, include: A memory on which computer programs are stored; A processor for executing the computer program in the memory to implement the steps of the method according to any one of claims 1-7.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-7.

10. A hybrid electric vehicle, characterized in that, include: The system includes a controller, a drive motor, a power battery, a bidirectional DC / DC converter, and a temperature sensor. The drive motor and the power battery are both electrically connected to the bidirectional DC / DC converter. The drive motor, the power battery, the bidirectional DC / DC converter, and the temperature sensor are all electrically connected to the controller. The temperature sensor is positioned close to the bidirectional DC / DC converter. The controller is used to perform the method according to any one of claims 1-7.

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