Vehicle control method and device, vehicle and storage medium

Abstract

The embodiment of the application is suitable for the technical field of vehicles, and provides a vehicle control method and device, a vehicle and a storage medium. The method comprises the following steps: if it is determined that the vehicle is in a limp-home mode because the vehicle meets a preset condition, obtaining vehicle information of the vehicle; the preset condition comprises that a relay in a battery device in the vehicle is disconnected; the vehicle information comprises a working voltage of the battery device; according to the vehicle information, determining a target voltage that needs to be output by a generator in the vehicle when the generator works; the target voltage is greater than the working voltage; the generator is used for supplying power to an electric device in the vehicle; if the output voltage of the generator has been adjusted to the target voltage, controlling the vehicle to switch to a normal mode; in the normal mode, the relay is closed, and the battery device is used for supplying power to the electric device. By using the above method, the mode of the vehicle can be switched to the normal mode when the relay of the battery device is disconnected, and the driving scene of the vehicle is improved.

Description

Technical Field

[0001] This application belongs to the field of vehicle technology, and in particular relates to a vehicle control method, device, vehicle and storage medium. Background Technology

[0002] Limp mode refers to a vehicle's automatic activation of a backup control circuit to control the engine when an electronic control device (such as a high-voltage battery) malfunctions, allowing the vehicle to drive briefly or stop and await assistance. However, this vehicle control strategy is not perfect.

[0003] For example, when the high-voltage battery temperature is below its operating temperature, the high-voltage battery relay will disconnect due to performance limitations, preventing the high-voltage battery from discharging properly. In this situation, to maintain vehicle operation, the vehicle needs to be driven by the engine, and the high-voltage equipment needs to be shut down.

[0004] Therefore, in the existing technology, the control strategy when a vehicle is in limp mode due to the disconnection of the high-voltage battery relay is unreasonable and cannot restore the vehicle to normal driving mode, resulting in vehicle driving limitation. Summary of the Invention

[0005] This application provides a vehicle control method, device, vehicle, and storage medium, which can solve the problem that the control strategy is unreasonable when the vehicle is in limp mode due to the disconnection of the high-voltage battery relay.

[0006] In a first aspect, embodiments of this application provide a vehicle control method, the method comprising:

[0007] If it is determined that the vehicle is in limp mode due to meeting preset conditions, then the vehicle information is obtained; the preset conditions include the disconnection of relays in the battery devices inside the vehicle; the vehicle information includes the operating voltage of the battery devices.

[0008] Based on the vehicle information, determine the target voltage that the generator inside the vehicle needs to output when it is working; the target voltage is greater than the operating voltage; the generator is used to supply power to the electrical equipment inside the vehicle.

[0009] If the generator's output voltage has been adjusted to the target voltage, the vehicle is switched to normal mode. In normal mode, the relay closes, and the battery is used to power the electrical equipment.

[0010] Secondly, embodiments of this application provide a vehicle control device, the device comprising:

[0011] The vehicle information acquisition module is used to acquire vehicle information if it is determined that the vehicle is in limp mode due to meeting preset conditions; the preset conditions include the disconnection of the relay in the battery device in the vehicle; the vehicle information includes the operating voltage of the battery device.

[0012] The target voltage determination module is used to determine the target voltage that the generator in the vehicle needs to output when it is working, based on vehicle information; the target voltage is greater than the operating voltage; the generator is used to supply power to the electrical equipment in the vehicle.

[0013] The mode switching module is used to control the vehicle to switch to normal mode if the generator's output voltage has been adjusted to the target voltage; in normal mode, the relay closes and the battery device is used to supply power to the electrical equipment.

[0014] Thirdly, embodiments of this application provide a vehicle including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect above.

[0015] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the first aspect above.

[0016] Fifthly, embodiments of this application provide a computer program product that, when run on a vehicle, causes the vehicle to perform the method described in the first aspect.

[0017] The beneficial effects of this application embodiment compared to the prior art are as follows: When it is determined that the vehicle is in limp mode due to the battery device's relay being disconnected, vehicle information, such as the battery device's operating voltage, is acquired. Then, based on the vehicle information, the target output voltage required for the generator to operate is determined, so that the generator supplies power to the vehicle's electrical equipment and battery device at the target voltage, maintaining the normal operation of each electrical device. Then, when the generator's output voltage is adjusted to the target voltage, the relay is controlled to close, allowing the battery device to replace the generator in supplying power to the electrical equipment normally. At this time, the engine does not need to drive the generator to supply power externally; it only needs to output torque normally. This allows the vehicle to drive in the driving mode corresponding to normal mode. Furthermore, in limp mode, because the target voltage is higher than the battery device's operating voltage, when the relay closes to allow the battery device to operate normally, the generator will not enter a depressurization state, avoiding generator failure and allowing the vehicle to smoothly switch to normal mode. Based on this, when the battery device's relay is disconnected, the vehicle's mode can also be controlled to switch to normal mode, improving the vehicle's driving performance. Attached Figure Description

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

[0019] Figure 1 This is a flowchart illustrating the implementation of a vehicle control method according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram illustrating one implementation of determining a target voltage in a vehicle control method according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the operation of various devices in a vehicle control method provided in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the structure of a vehicle control device provided in one embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application. Detailed Implementation

[0024] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0025] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0026] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Limp mode in vehicles refers to the automatic activation of a backup control circuit to control the engine when an electronic control device (such as a high-voltage battery) malfunctions, allowing the vehicle to drive briefly or stop and await assistance. However, this vehicle control strategy is not perfect.

[0028] For example, when the high-voltage battery temperature is below its operating temperature, such as below -30°C, the high-voltage battery will automatically disconnect the relay due to limitations in battery performance. In this situation, the high-voltage battery will be unable to discharge normally.

[0029] In this scenario, for hybrid vehicles, the vehicle needs to be driven by the engine to maintain operation, and high-voltage equipment needs to be shut down. For example, the drive motor and high-voltage air conditioning within the vehicle need to be disabled. Since the drive motor is disabled, the only device providing drive torque is the engine.

[0030] Therefore, in the existing technology, the strategy for controlling a vehicle in limp mode due to relay disconnection is unreasonable, and it cannot restore the vehicle to normal driving mode, resulting in vehicle driving restriction.

[0031] In this embodiment, when the vehicle is in limp mode due to the disconnection of the battery device's relay, in order to switch the vehicle back to normal mode, this application provides a vehicle control method that can be applied to in-vehicle equipment. For example, the aforementioned in-vehicle equipment can be a vehicle control unit or a battery management system (BMS) within the vehicle, and there is no limitation thereto.

[0032] Please see Figure 1 , Figure 1 The following is a flowchart illustrating the implementation of a vehicle control method according to an embodiment of this application. The method includes the following steps:

[0033] S101. If it is determined that the vehicle is in limp mode due to meeting preset conditions, then obtain the vehicle information; the preset conditions include the relay in the battery device inside the vehicle being disconnected; the vehicle information includes the operating voltage of the battery device.

[0034] In one embodiment, the aforementioned battery device can be a battery pack or a high-voltage battery in a vehicle, without limitation. This embodiment uses a high-voltage battery as an example for explanation. The high-voltage battery supplies power to various high-voltage devices within the vehicle. Exemplary examples include, but are not limited to, drive motors and high-voltage air conditioning units, which will not be described in detail.

[0035] In one embodiment, the aforementioned vehicle information includes, but is not limited to, the operating voltage of the battery device, the maximum charging power of the battery device, and the power consumption of each electrical device.

[0036] The power consumption of each of the aforementioned electrical devices is typically a fixed value, which can be predetermined based on the device parameters of each device, and will not be described in detail here. Furthermore, the operating voltage and maximum charging power of the battery device are usually related to the battery device's own performance; therefore, the operating voltage can be directly determined based on the battery device's equipment information.

[0037] Specifically, regarding operating voltage, the onboard equipment can acquire the battery temperature and remaining charge of the battery device. Then, based on the battery device's preset operating performance, it determines the maximum charging power and operating voltage of the battery device at the given battery temperature and remaining charge.

[0038] The battery temperature and remaining charge can be determined by the battery management system. The preset performance parameters are inherent properties of the battery itself, which are determined at the factory.

[0039] Specifically, the aforementioned preset operating performance can be used to characterize specific parameters of the battery device, such as rated capacity, operating voltage, charge / discharge rate, maximum charging power, impedance, and self-discharge rate, under different battery temperatures and remaining charge levels.

[0040] Therefore, the maximum charging power mentioned above refers to the charging power corresponding to the battery temperature and remaining charge, and the operating voltage mentioned above refers to the actual voltage provided by the battery device when it is operating normally under the battery temperature and remaining charge. Typically, this operating voltage is lower than the rated voltage of the battery device.

[0041] In one embodiment, the aforementioned limp mode refers to the vehicle controller automatically activating a backup control circuit to control the engine when an electronic control device (e.g., a high-voltage battery) malfunctions in the vehicle, so that the vehicle can drive briefly or stop to wait for assistance.

[0042] It should be noted that a malfunction in the electronic control equipment may be due to a disconnected relay in the high-voltage battery, preventing the high-voltage battery from charging and discharging normally, or it may be caused by a malfunction in other components of the electronic control equipment. In this embodiment, the vehicle control method mainly addresses the scenario where a relay in the battery device is disconnected.

[0043] Normally, when a vehicle is powered on, the relays in the battery device close, supplying power to all electrical devices. When the vehicle is powered off, the relays in the battery device open, stopping the supply of power to the electrical devices.

[0044] However, during vehicle power-on, the battery device may, due to its own battery performance—for example, if the battery temperature drops below a preset temperature (-30°C or -10°C)—cause the relay to disconnect, forcing the vehicle to operate in limp mode. Therefore, the aforementioned preset condition can specifically be the disconnection of a relay in the battery device. In other words, the vehicle's limp mode is caused by the disconnection of the battery device's relay.

[0045] It should be added that the purpose of this application embodiment is to control the vehicle to switch back to normal mode. However, in normal mode, the relays in the vehicle need to be closed. Based on this, when it is determined that the vehicle is in limp mode due to meeting preset conditions, the battery temperature also needs to be controlled to be higher than the preset temperature before the subsequent steps S102-S103 can be executed.

[0046] Based on this, the on-board equipment can obtain the battery temperature in the battery device. Then, if the battery temperature is lower than or equal to the preset temperature, the battery device is heated based on the residual heat generated by the engine when the vehicle is driving in limp mode, until the battery temperature is higher than the preset temperature.

[0047] Specifically, when the battery temperature is higher than the preset temperature, the battery device can be considered to have met the prerequisite for relay closure. Therefore, the relay closure can be controlled.

[0048] In one embodiment, as described above, in limp mode, the vehicle relies solely on the engine for power. Therefore, to implement the vehicle control method, the onboard equipment can use the waste heat generated by the engine to heat the battery when the battery temperature is determined to be below or equal to a preset temperature, until the battery temperature is detected to be above the preset temperature, at which point the vehicle information is acquired. Otherwise, the vehicle remains in limp mode. The method for acquiring the battery temperature has already been described above and will not be explained further.

[0049] In another embodiment, when the battery temperature is higher than a preset temperature, the user can also control the vehicle to power off and then power on again, so that during the power-on process, the vehicle controller can request the high-voltage battery to close the relay, so that the vehicle returns to normal mode.

[0050] However, this method requires the user to pull over and turn off the vehicle, which reduces the user experience and fails to achieve vehicle automation.

[0051] Therefore, in order to automatically switch the vehicle from limp mode to normal mode without requiring the user to pull over, the on-board device can achieve this based on the following steps S102-S103.

[0052] S102. Based on the vehicle information, determine the target voltage that the generator in the vehicle needs to output when it is working; the target voltage is greater than the working voltage; the generator is used to supply power to the electrical equipment in the vehicle.

[0053] In one embodiment, the relay is disconnected, preventing the battery from supplying power to the electrical devices in the vehicle. Therefore, in order to maintain the normal operation of the various electrical devices in the vehicle and control the vehicle to move, the engine needs to drive the generator to supply power to the electrical devices.

[0054] It should be noted that when the generator supplies power to the electrical equipment, if a relay is requested to close, the battery device will supply power to the electrical equipment (high-voltage equipment) when the relay closes, restoring it to its working state.

[0055] However, in the above situation, if the relay is closed, the battery device will supply power to the external devices at its operating voltage. At this time, if the target voltage for the generator to supply power to the electrical equipment is lower than the operating voltage generated by the battery device, the generator will enter a depressurization state. For example, it may control the rotor in the generator to run at high speed to consume the high voltage provided by the battery device, which can easily cause generator failure. Therefore, the target voltage determined based on vehicle information needs to be greater than the operating voltage of the battery device to ensure that the generator is in normal condition when the vehicle is switched to normal mode.

[0056] The method for obtaining the operating voltage has already been explained in S101 above, and will not be described again here.

[0057] In one embodiment, the electrical equipment inside the vehicle is generally divided into low-voltage equipment and high-voltage equipment, wherein the high-voltage equipment has already been described above. Low-voltage equipment may include the ignition switch and various lighting devices inside the vehicle, which will not be described further.

[0058] It should be added that the aforementioned battery devices are typically high-voltage batteries, which can directly power high-voltage equipment. For low-voltage equipment, a direct current-to-direct current (DC-DC) converter is needed to transform the operating voltage output from the high-voltage battery into a lower amplitude voltage to power the low-voltage equipment. For example, the operating voltage output of a high-voltage battery is typically 48V, while the operating voltage required by low-voltage equipment is typically 12V.

[0059] Therefore, the target voltage can be primarily determined based on the power consumption required for the low-voltage equipment to operate. This requires voltage conversion via a DC-DC converter when supplying power to each low-voltage device. Based on this, the vehicle-mounted equipment can determine the power consumption of the low-voltage equipment during operation using the DC-DC converter.

[0060] In one specific embodiment, the vehicle-mounted device may be referred to as follows: Figure 2The target voltage is determined by S201-S203 as shown below:

[0061] S201. Determine the voltage output range of the generator based on the operating voltage; the minimum value in the voltage output range is higher than the operating voltage, and the maximum value is the sum of the operating voltage and the preset voltage.

[0062] In one embodiment, the preset voltage can be set according to actual conditions and is not limited thereto. For example, the preset voltage can be 3V or 5V. As explained above, the target voltage needs to be greater than the operating voltage. Therefore, after determining the operating voltage, the target voltage can be obtained by adding the preset voltage to the operating voltage.

[0063] However, if the sum of the working voltage and the preset voltage is directly determined as the target voltage, when the generator supplies power to the low-voltage equipment and battery equipment at the target voltage, the generator's output power may only meet the power consumption of the low-voltage equipment and be insufficient to supply power to the battery equipment; or, after meeting the power consumption of the low-voltage equipment, the remaining output power may be greater than the maximum charging power of the battery equipment, resulting in overcharging of the battery equipment.

[0064] Based on this, the on-board equipment can generate the aforementioned voltage output range according to the operating voltage and the preset voltage. Within this voltage output range, the number of voltages included can be a fixed number. In this case, each voltage included in the voltage output range can be determined.

[0065] For example, the ratio between a preset voltage and a preset quantity can be determined. Then, the minimum value is determined as the sum of the operating voltage and the ratio. Furthermore, it can be assumed that all voltages within the voltage output range are arithmetic progressions, with the arithmetic constant being the aforementioned ratio. That is, adjacent voltages differ by a ratio.

[0066] For example, with an operating voltage of 10V and a preset voltage of 5V, the voltage output range can be from 10V to 15V. If the fixed number is set to 10, then adjacent voltages will differ by 0.5V. Based on this, the voltages included in the voltage output range can be determined to be 10.5V, 11V, 11.5V, ..., 15V.

[0067] The above is merely an example of determining each voltage within the voltage output range. In this embodiment, the method for determining each voltage within the voltage output range is not limited.

[0068] It should be noted that there are multiple voltages obtained based on the above method. In order to determine the target voltage, it is necessary to determine it according to the following steps S202-S203.

[0069] S202. Calculate the sum of the maximum charging power and the power consumed to obtain the desired output power.

[0070] S203. Determine the target voltage from the voltage output range based on the power consumption and the desired output power.

[0071] In one embodiment, the number and type of low-voltage devices in operation may change in real time when the vehicle is in motion. Therefore, the power consumption mentioned above is the power consumed by the low-voltage devices in operation at the current moment.

[0072] It should be noted that the expected output power mentioned above is the sum of the power consumed by the low-voltage equipment and the maximum charging power of the battery. Therefore, if the output power provided by the generator at a constant voltage (target voltage unchanged) is greater than the expected output power, it can be considered that the generator will overcharge the battery. Conversely, if the output power is less than or equal to the power consumed, the battery cannot be charged.

[0073] Based on this, for any voltage within the voltage output range, the generator can first determine the output power required to supply power to external systems at that voltage. Then, the output power that is greater than the power consumed but less than or equal to the desired output power can be determined as the target output power. Furthermore, the voltage corresponding to the target output power can be determined as the target voltage.

[0074] It should be noted that when determining the target output power, there may be multiple target output powers that meet the above conditions. In this case, in order to further determine the target voltage, the voltage corresponding to the target output power that is lower than or equal to the maximum output power can be determined as the target voltage.

[0075] The aforementioned maximum output power refers to the maximum output power that the generator can output when it is operating. This maximum output power can be determined based on parameters such as the generator's brand, configuration, and unit power. In other words, the aforementioned maximum output power is a characteristic of the generator and is a fixed value that can be determined at the time the generator equipment leaves the factory.

[0076] It is understandable that when the target output power exceeds the maximum output power, the generator can be considered to be in an over-discharge state. However, continuous over-discharge will cause the generator coil and core temperatures to rise abnormally, damaging the generator.

[0077] Therefore, for multiple target output powers, the on-board equipment should determine the voltage corresponding to the target output power that is lower than or equal to the maximum output power of the generator as the target voltage. Similarly, when there are multiple target output powers that are lower than or equal to the maximum output power, the minimum value of the multiple target output powers can be determined as the final target output power to reduce the energy consumption provided by the generator.

[0078] In another embodiment, when determining the target voltage, the above processing can be performed on each voltage sequentially from smallest to largest. That is, the output power corresponding to the voltage is determined, and then it is determined whether the output power meets the above judgment conditions (output power is greater than the consumed power, and less than or equal to the expected output power, and less than the maximum output power). If the above conditions are met, the voltage is determined to be the target voltage. Therefore, it is unnecessary to perform the above processing on all voltages, improving the efficiency of target voltage determination.

[0079] It should be added that if the output power does not meet the above conditions, i.e. the target output power is not determined, and / or the target output power is greater than the maximum output power, the on-board equipment can still control the vehicle to drive in limp mode.

[0080] Understandably, when driving in limp mode, the residual heat generated by the engine will continue to heat the battery, thus altering its temperature. This, in turn, can change the battery's maximum charging power and operating voltage. For example, the maximum charging power and operating voltage can be increased. At this point, the onboard equipment can then re-determine the target voltage based on the altered maximum charging power and operating voltage.

[0081] S103. If the generator's output voltage has been adjusted to the target voltage, the vehicle is switched to normal mode. In normal mode, the relay is closed, and the battery device is used to supply power to the electrical equipment.

[0082] In one embodiment, the generator can employ a voltage regulation control method to adjust the output voltage to a target voltage. When the generator outputs the target voltage, the actual output voltage detected by the on-board equipment may be higher or lower than the target voltage. In this case, if the voltage difference between the detected actual output voltage and the target voltage is less than a preset difference value, it can be considered that the generator's output voltage has been adjusted to the target voltage.

[0083] In one embodiment, in normal mode, the relay in the battery device is closed and can be used to supply power to electrical devices. For example, it can supply power to high-voltage equipment in the vehicle. It should be added that when switching to normal mode, because the battery device can be used to supply power to electrical devices, the generator can stop supplying power to the electrical devices and instead provide drive torque to the vehicle. That is, in response to the engine's drive, drive torque is provided to the wheels.

[0084] Specifically, after the relay closes, the onboard equipment can control the generator to exit the voltage operating state and enter standby mode. Then, it controls the generator, drive motor, and high-voltage equipment to enter operating mode, and maintains the DC-DC converter's operating state (Buck) to convert the high voltage output from the battery. After the generator, drive motor, and high-voltage equipment enter operating mode, the vehicle can switch from limp mode to normal mode.

[0085] In this embodiment, when it is determined that the vehicle is in limp mode due to the battery device's relay being disconnected, vehicle information, such as the battery device's operating voltage, is acquired. Then, based on the vehicle information, the target output voltage required for the generator to operate is determined, so that the generator supplies power to the vehicle's electrical equipment and battery device at the target voltage, maintaining the normal operation of each electrical device. Next, when the generator's output voltage is adjusted to the target voltage, the relay is controlled to close, allowing the battery device to replace the generator in supplying power to the electrical equipment normally. At this time, the engine does not need to drive the generator to supply power externally; it only needs to output torque normally. This allows the vehicle to drive in the driving mode corresponding to normal mode. Furthermore, in limp mode, because the target voltage is higher than the battery device's operating voltage, when the relay closes to allow the battery device to operate normally, the generator will not enter a depressurization state, avoiding generator failure and allowing the vehicle to smoothly switch to normal mode. Based on this, when the battery device's relay is disconnected, the vehicle can also be controlled to switch from limp mode to normal mode using the above vehicle control method, improving the vehicle's driving performance.

[0086] In one specific embodiment, reference is made to Figure 3 , Figure 3 This is a schematic diagram illustrating the operation of various devices within a vehicle in a vehicle control method provided in an embodiment of this application. These devices include on-board equipment (taking a vehicle controller as an example), a generator, battery equipment (taking a high-voltage battery as an example), a DC-DC converter, a drive motor, and high-voltage equipment.

[0087] In limp mode, the generator primarily supplies power to various electrical devices. However, the target voltage for this power supply needs to be higher than the operating voltage of the high-voltage battery. This target voltage is determined based on various factors, including the high-voltage battery's operating voltage, maximum charging power, and the power consumption of the DC-DC converter (the power consumption of low-voltage devices). Therefore, in limp mode, the generator must respond to the target voltage request sent by the vehicle controller to output the target voltage. Furthermore, it must detect the actual voltage and current output at the current moment and send this information to the vehicle controller, allowing the controller to determine the generator's output power based on these parameters.

[0088] Furthermore, when the vehicle switches to normal driving mode, the generator primarily outputs drive torque to propel the vehicle. Therefore, during mode switching, the vehicle controller needs to send a first state request (standby request) to the generator to switch it to standby mode. Afterward, the vehicle controller can send a second state request (torque operation request) based on the generator's state in normal driving mode to control the generator to output the target torque. Therefore, the vehicle controller can also be considered to have the function of controlling the state of the vehicle's powertrain system (a system composed of power devices such as the engine, generator, and drive motor).

[0089] For high-voltage batteries, it's necessary to monitor their temperature and remaining charge to determine their maximum charging power and operating voltage. Additionally, to determine the actual charging power, it can be based on the operating voltage and the battery's actual current to prevent overcharging. Alternatively, it can be determined based on the generator's output power and the power consumption of low-voltage equipment; there are no strict limitations on this. Therefore, when the high-voltage battery detects its maximum charging power and operating voltage, it also needs to send this information to the vehicle controller.

[0090] This application's embodiment addresses a scenario where the relay is disconnected in limp-mode. Therefore, the high-voltage battery also needs to detect the relay's state (open or closed) and send this information to the vehicle controller. Subsequently, when the vehicle controller determines that the generator's output voltage has been adjusted to the target voltage, it can send a relay control request to the high-voltage battery to cause the high-voltage battery to control the relay to close. In other words, the high-voltage battery has the function of controlling the relay switch.

[0091] The DC-DC converter is responsible for voltage conversion for various low-voltage devices. In limp-mode, the DC-DC converter needs to continuously convert the target voltage provided by the generator to a low voltage for power supply. Therefore, in limp-mode, the DC-DC converter needs to respond to the vehicle controller's status requests, switching from standby to operating mode. As mentioned above, the power consumption of the low-voltage devices is required when calculating the target voltage. Based on this, the DC-DC converter needs to detect its actual current and voltage and send them to the vehicle controller so that the vehicle controller can calculate the power consumption of the low-voltage devices. In normal mode, the high-voltage battery provides power. However, the actual voltage output by the high-voltage battery is also greater than the operating voltage of the low-voltage devices. Therefore, the DC-DC converter still needs to be in an operating state.

[0092] For the drive motor, in limp mode, the vehicle is primarily driven by the engine, and the drive motor is in standby mode. In normal mode, the vehicle can be driven by either the drive motor or the engine. In this mode, the drive motor needs to switch its actual state according to the status request output by the vehicle controller. For example, when switching to the operating state, it responds to the torque demand sent by the vehicle controller to drive the vehicle.

[0093] For high-voltage equipment, power can be supplied by the generator when the high-voltage battery relay is disconnected. Therefore, the actual state of the high-voltage equipment can be switched normally according to the state requests sent by the vehicle controller in limp mode and normal mode. That is, compared with the prior art, which requires controlling all high-voltage equipment to stop working in limp mode, in this embodiment, the high-voltage equipment can work normally according to the target voltage output by the generator.

[0094] Please see Figure 4 , Figure 4 This is a structural block diagram of a vehicle control device provided in an embodiment of this application. The modules included in this embodiment of the vehicle control device are used to execute... Figure 1 and Figure 2 The steps in the corresponding embodiments. Please refer to the details. Figure 1 and Figure 2 as well as Figure 1 and Figure 2 The relevant descriptions in the corresponding embodiments are shown below. For ease of explanation, only the parts relevant to this embodiment are shown. See also... Figure 4 The vehicle control device 400 may include: a vehicle information acquisition module 410, a target voltage determination module 420, and a mode switching module 430, wherein:

[0095] The vehicle information acquisition module 410 is used to acquire vehicle information if it is determined that the vehicle is in limp mode due to meeting preset conditions; the preset conditions include the relay in the battery device inside the vehicle being disconnected; the vehicle information includes the operating voltage of the battery device.

[0096] The target voltage determination module 420 is used to determine the target voltage that the generator in the vehicle needs to output when it is working, based on the vehicle information; the target voltage is greater than the working voltage; the generator is used to supply power to the electrical equipment in the vehicle.

[0097] The mode switching module 430 is used to control the vehicle to switch to normal mode if the generator output voltage has been adjusted to the target voltage; in normal mode, the relay is closed and the battery device is used to supply power to the electrical equipment.

[0098] In one embodiment, the vehicle control device 400 further includes:

[0099] The battery temperature acquisition module is used to acquire the battery temperature in the battery device.

[0100] The heating module is used to heat the battery device based on the residual heat generated by the engine when the vehicle is driving in limp mode, if the battery temperature is lower than or equal to the preset temperature, until the battery temperature is higher than the preset temperature.

[0101] In one embodiment, the vehicle information also includes the maximum charging power of the battery device; the vehicle information acquisition module 410 is further configured to:

[0102] Obtain the battery temperature and remaining charge of the battery device; based on the preset operating performance of the battery device, determine the maximum charging power and operating voltage of the battery device under the given battery temperature and remaining charge.

[0103] In one embodiment, the electrical equipment includes low-voltage equipment, and the vehicle information also includes the power consumption of the low-voltage equipment during operation; the target voltage determination module 420 is further configured to:

[0104] Based on the operating voltage, determine the voltage output range of the generator; the minimum value in the voltage output range is higher than the operating voltage, and the maximum value is the sum of the operating voltage and the preset voltage; calculate the sum of the maximum charging power and the power consumed to obtain the desired output power; based on the power consumed and the desired output power, determine the target voltage from the voltage output range.

[0105] In one embodiment, the target voltage determination module 420 is further configured to:

[0106] For any voltage within the voltage output range, determine the output power required for the generator to supply power to battery devices and low-voltage devices; from multiple output powers, determine the target output power that is greater than the consumed power and less than or equal to the desired output power; and determine the voltage corresponding to the target output power as the target voltage.

[0107] In one embodiment, the target voltage determination module 420 is further configured to:

[0108] The voltage corresponding to the target output power that is lower than or equal to the maximum output power of the generator when it is working is determined as the target voltage.

[0109] In one embodiment, the vehicle control device 400 further includes:

[0110] If the target output power is not determined, and / or the target output power is greater than the maximum output power, the vehicle is controlled to drive in limp mode.

[0111] When it is understood that, Figure 4 In the structural block diagram of the vehicle control device shown, each module is used to perform... Figure 1 and Figure 2 The steps in the corresponding embodiments, and for Figure 1 and Figure 2 The steps in the corresponding embodiments have been explained in detail in the above embodiments. Please refer to them for details. Figure 1 and Figure 2 as well as Figure 1 and Figure 2 The relevant descriptions in the corresponding embodiments will not be repeated here.

[0112] Figure 5 This is a structural block diagram of a vehicle provided in one embodiment of this application. For example... Figure 5 As shown, the vehicle 500 in this embodiment includes a processor 510, a memory 520, and a computer program 530 stored in the memory 520 and executable on the processor 510, such as a program for a vehicle control method. When the processor 510 executes the computer program 530, it implements the steps in the various embodiments of the above-described vehicle control methods, for example... Figure 1 S101 to S104 are shown. Alternatively, the processor 510 may implement the above when executing the computer program 530. Figure 4 The functions of each module in the corresponding embodiments, for example, Figure 4 For details on the functions of modules 410 to 430 shown, please refer to [link / reference]. Figure 4 The relevant descriptions in the corresponding embodiments.

[0113] For example, the computer program 530 can be divided into one or more modules, one or more of which are stored in the memory 520 and executed by the processor 510 to implement the vehicle control method provided in the embodiments of this application. One or more modules can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 530 in the vehicle 500. For example, the computer program 530 can implement the vehicle control method provided in the embodiments of this application.

[0114] Vehicle 500 may include, but is not limited to, processor 510 and memory 520. Those skilled in the art will understand that... Figure 5 This is merely an example of vehicle 500 and does not constitute a limitation on vehicle 500. It may include more or fewer components than shown, or combine certain components, or different components. For example, a vehicle may also include input / output devices, network access devices, buses, etc.

[0115] The processor 510 may be a central processing unit, or it may be other general-purpose processors, digital signal processors, application-specific integrated circuits, off-the-shelf programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0116] The memory 520 can be an internal storage unit of the vehicle 500, such as a hard drive or memory of the vehicle 500. The memory 520 can also be an external storage device of the vehicle 500, such as a plug-in hard drive, smart memory card, flash memory card, etc., installed on the vehicle 500. Furthermore, the memory 520 can include both internal storage units and external storage devices of the vehicle 500.

[0117] This application provides a computer-readable storage medium storing a computer program, which is executed by a processor using the vehicle control methods described in the above embodiments.

[0118] This application provides a computer program product that, when run on a vehicle, causes the vehicle to execute the vehicle control methods described in the above embodiments.

[0119] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A vehicle control method, characterized in that, The method includes: If it is determined that the vehicle is in limp mode due to meeting preset conditions, then the vehicle information is obtained; the preset conditions include the disconnection of a relay in the battery device inside the vehicle; the vehicle information includes the operating voltage of the battery device. Based on the vehicle information, the target voltage that the generator in the vehicle needs to output when it is working is determined; the target voltage is greater than the operating voltage; the generator is used to supply power to the electrical equipment in the vehicle. If the output voltage of the generator has been adjusted to the target voltage, the vehicle is controlled to switch to normal mode; in normal mode, the relay is closed, and the battery device is used to supply power to the electrical equipment.

2. The method according to claim 1, characterized in that, Before obtaining the vehicle information of the vehicle, the method further includes: Obtain the battery temperature in the battery device; If the battery temperature is lower than or equal to a preset temperature, the battery device is heated based on the residual heat generated by the engine when the vehicle is driving in the limp mode, until the battery temperature is higher than the preset temperature.

3. The method according to claim 1, characterized in that, The vehicle information also includes the maximum charging power of the battery device; obtaining the vehicle information includes: Obtain the battery temperature and remaining charge of the battery device; Based on the preset operating performance of the battery device, the maximum charging power and the operating voltage of the battery device are determined at the battery temperature and the remaining charge.

4. The method according to claim 3, characterized in that, The electrical equipment includes low-voltage equipment, and the vehicle information also includes the power consumption of the low-voltage equipment during operation; determining the target voltage that the generator in the vehicle needs to output when operating, based on the vehicle information, includes: The voltage output range of the generator is determined based on the operating voltage; the minimum value in the voltage output range is higher than the operating voltage, and the maximum value is the sum of the operating voltage and the preset voltage. The sum of the maximum charging power and the power consumed is calculated to obtain the desired output power; The target voltage is determined from the voltage output range based on the power consumed and the desired output power.

5. The method according to claim 4, characterized in that, Determining the target voltage from the voltage output range based on the power consumption and the desired output power includes: For any voltage within the voltage output range, determine the output power that the generator needs to output when supplying power to the battery device and the low-voltage device at the voltage; From the plurality of said output powers, determine a target output power that is greater than the consumed power and less than or equal to the desired output power; The voltage corresponding to the target output power is determined as the target voltage.

6. The method according to claim 5, characterized in that, The target output power has multiple values; determining the voltage corresponding to the target output power as the target voltage includes: The voltage corresponding to the target output power that is lower than or equal to the maximum output power of the generator when it is working is determined as the target voltage.

7. The method according to claim 5, characterized in that, The method further includes: If the target output power is not determined, and / or the target output power is greater than the maximum output power of the generator when it is operating, then the vehicle is controlled to drive in the limp mode.

8. A vehicle control device, characterized in that, The device includes: The vehicle information acquisition module is used to acquire vehicle information if it is determined that the vehicle is in limp mode due to meeting preset conditions; the preset conditions include the disconnection of a relay in the battery device inside the vehicle; the vehicle information includes the operating voltage of the battery device. The target voltage determination module is used to determine, based on the vehicle information, the target voltage that the generator in the vehicle needs to output when it is working; the target voltage is greater than the operating voltage; the generator is used to supply power to the electrical equipment in the vehicle; The mode switching module is used to control the vehicle to switch to normal mode if the output voltage of the generator has been adjusted to the target voltage; in the normal mode, the relay is closed, and the battery device is used to supply power to the electrical equipment.

9. A vehicle comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 7.

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