Control method, device and storage medium of hybrid vehicle

Abstract

This application discloses a control method, device, and storage medium for a hybrid vehicle, belonging to the field of vehicle control technology. The method includes: determining a prohibited direct-drive indicator based on the hybrid vehicle's operating information, wherein the prohibited direct-drive indicator indicates whether the hybrid vehicle's engine is prohibited from entering direct-drive mode; determining a requested direct-drive indicator based on the hybrid vehicle's ambient temperature and the operating information, wherein the requested direct-drive indicator indicates whether the engine is requested to enter direct-drive mode; determining a permitted direct-drive indicator based on the prohibited direct-drive indicator and the requested direct-drive indicator, wherein the permitted direct-drive indicator indicates whether the engine is allowed to enter direct-drive mode; and controlling the engine to enter direct-drive mode based on the permitted direct-drive indicator. This solution can accurately control whether the engine operates in direct-drive mode after engine start-up.

Description

Technical Field

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

[0002] Plug-in hybrid electric vehicles (PHEVs) are a type of new energy vehicle that falls between pure electric vehicles and gasoline-powered vehicles. PHEVs possess the engine, transmission, drivetrain, fuel system, and fuel tank found in gasoline vehicles, as well as the battery and drive motor found in pure electric vehicles. They also include a generator, which can charge the battery via the engine. They can achieve pure electric, zero-emission driving, or extend the vehicle's range through hybrid mode.

[0003] In plug-in hybrid electric vehicles (PHEVs), the engine, in direct-drive mode, can directly connect power to the wheels via the transmission. This results in higher overall energy efficiency and lower fuel consumption compared to the engine's range-extender mode. However, because engine speed and vehicle speed are positively correlated in direct-drive mode, if the vehicle speed drops sharply or the vehicle slips, it's necessary to switch from direct-drive mode to range-extender mode to decouple engine speed from vehicle speed and prevent engine stalling or hardware damage due to a decrease in vehicle speed.

[0004] Therefore, how to accurately control whether the engine runs in direct drive mode after the engine of a plug-in hybrid electric vehicle starts is an urgent problem to be solved. Summary of the Invention

[0005] Embodiments of this application provide a control method, device, and storage medium for a hybrid vehicle, which can at least to some extent accurately control whether the engine operates in direct drive mode.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to a first aspect of the embodiments of this application, a method based on the operation information of a hybrid vehicle is provided, comprising: determining a prohibited direct drive indicator, wherein the prohibited direct drive indicator is used to indicate whether the engine of the hybrid vehicle is prohibited from entering direct drive mode; determining a requested direct drive indicator based on the ambient temperature and operation information of the hybrid vehicle, wherein the requested direct drive indicator is used to indicate whether the engine is requested to enter direct drive mode; determining a permitted direct drive indicator based on the prohibited direct drive indicator and the requested direct drive indicator, wherein the permitted direct drive indicator is used to indicate whether the engine is allowed to enter direct drive mode; and controlling the engine to enter direct drive mode based on the permitted direct drive indicator.

[0008] In some embodiments, the operating information includes at least one of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery level, target battery level, maximum allowable battery discharge power, maximum allowable battery charging power, transmission control unit (TCU) prohibit direct drive flag, and engine initial start flag. The prohibition of direct drive flag includes the prohibition of direct drive flag. Determining the prohibition of direct drive flag based on the operating information of the hybrid vehicle includes: determining the prohibition of direct drive flag based on multiple of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery level, target battery level, maximum allowable battery discharge power, maximum allowable battery charging power, TCU prohibition of direct drive flag, and engine initial start flag.

[0009] In some embodiments, determining a prohibition-of-direct-drive flag based on at least one of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery charge, target battery charge, maximum allowable battery discharge power, maximum allowable battery charging power, TCU prohibition-of-direct-drive flag, and engine initial start flag, includes: determining a first candidate prohibition-of-direct-drive flag based on the driving mode and ESC off flag; determining a second candidate prohibition-of-direct-drive flag based on the vehicle reference speed and front wheel speed; determining a third candidate prohibition-of-direct-drive flag based on the front wheel speed and brake pedal travel; determining a fourth candidate prohibition-of-direct-drive flag based on the current battery charge, target battery charge, maximum allowable battery discharge power, or maximum allowable battery charging power; and determining a fifth candidate prohibition-of-direct-drive flag based on the TCU prohibition-of-direct-drive flag or engine initial start flag. If any of the first to fifth candidate prohibition-of-direct-drive flags is set, the prohibition-of-direct-drive flag is set to indicate that the engine is prohibited from entering direct-drive mode.

[0010] In some embodiments, determining a first candidate prohibit direct drive flag based on the driving mode and the ESC off flag includes: if the driving mode is a first preset driving mode associated with the ESC off flag and the ESC off flag is set, then the first candidate prohibit direct drive flag is set; if the driving mode is a second preset driving mode not associated with the ESC off flag, then the first candidate prohibit direct drive flag is set.

[0011] In some embodiments, determining a second candidate no-direct-drive sign position based on the vehicle reference speed and the front wheel speed includes: if the front wheel speed is greater than the sum of the vehicle reference speed and the first preset speed for a first preset duration, then setting the second candidate no-direct-drive sign position; after the second candidate no-direct-drive sign position is set, if the front wheel speed is less than the sum of the vehicle reference speed and the second preset speed for a second preset duration, then resetting the second candidate no-direct-drive sign position, wherein the first preset speed is greater than the second preset speed.

[0012] In some embodiments, determining a third candidate prohibition of direct drive flag position based on front wheel speed and brake pedal travel includes: if the front wheel speed and brake pedal travel meet preset conditions and remain for a third preset duration, then setting the third candidate prohibition of direct drive flag position, wherein the preset conditions include the front wheel speed being greater than a third preset speed and the brake pedal travel being greater than a preset travel; if, after the third candidate prohibition of direct drive flag position is set, the front wheel speed and brake pedal travel do not meet the preset conditions and remain for a fourth preset duration, then resetting the third candidate prohibition of direct drive flag position.

[0013] In some embodiments, a fourth candidate direct drive prohibition flag is determined based on the current battery level, the target battery level, the maximum allowable discharge power of the battery, or the maximum allowable charging power of the battery. This includes setting the fourth candidate direct drive prohibition flag if the current battery level is less than a preset level, the difference between the current battery level and the target battery level is less than a preset level difference, the maximum allowable discharge power of the battery is less than a preset discharge power, or the maximum allowable charging power of the battery is less than a preset charging power.

[0014] In some embodiments, determining a fifth candidate direct drive prohibition flag based on the TCU prohibition direct drive flag or the engine first start flag includes: if the TCU prohibition direct drive flag is set or the engine first start flag is set, then the fifth candidate prohibition direct drive flag is set.

[0015] In some embodiments, the operating information includes multiples of the following: front wheel speed, driver-demanded torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, and engine range extender mode start flag. The request for direct drive flag includes a request for direct drive flag. Determining the request for direct drive flag based on the ambient temperature and operating information of the hybrid vehicle includes: determining the request for direct drive flag based on multiples of the following: front wheel speed, driver-demanded torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, engine range extender mode start flag, and ambient temperature.

[0016] In some embodiments, determining a request for direct drive flag based on multiples of the following: front wheel speed, driver-demanded torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, engine range extender mode activation flag, and ambient temperature, includes: determining a first candidate request for direct drive flag based on ambient temperature and front wheel speed; determining a second candidate request for direct drive flag based on driver-demanded torque, maximum permissible wheel-side torque at the motor end, and maximum permissible wheel-side torque at the battery end; if both the first and second candidate request for direct drive flags are set, or if both the first candidate request for direct drive flag and the engine range extender mode activation flag are set, then the request for direct drive flag is set to indicate a request for the engine to enter direct drive mode.

[0017] In some embodiments, determining a first candidate direct drive request flag based on ambient temperature and front wheel speed includes: determining a speed threshold corresponding to the ambient temperature; if the front wheel speed is greater than the speed threshold, setting the first candidate direct drive request flag; if setting the first candidate direct drive request flag results in the front wheel speed being less than the difference between the speed threshold and a fourth preset speed, resetting the first candidate direct drive request flag.

[0018] In some embodiments, determining the second candidate direct drive request flag bit based on the driver's required torque, the maximum permissible wheel-side torque at the motor end, and the maximum permissible wheel-side torque at the battery end includes: if both the driver's required torque and the maximum permissible wheel-side torque at the battery end are greater than the maximum permissible wheel-side torque at the motor end, then setting the second candidate direct drive request flag bit.

[0019] In some embodiments, the prohibited direct drive indicator includes a prohibited direct drive flag bit, the requested direct drive indicator includes a requested direct drive flag bit, and the direct drive permitted indicator includes a direct drive permitted flag bit. Determining the direct drive permitted indicator based on the prohibited direct drive indicator and the requested direct drive indicator includes: if the prohibited direct drive flag bit is reset and the requested direct drive flag bit is set, then setting the direct drive permitted flag bit to indicate that the engine is allowed to enter direct drive mode.

[0020] According to a second aspect of the embodiments of this application, a control device for a hybrid vehicle is provided, including a processor and a memory. The memory stores computer program instructions that can be executed by the processor. When the processor executes the computer program instructions, it implements the steps of the method as described in any of the first aspects above.

[0021] According to a third aspect of the embodiments of this application, a computer-readable storage medium is provided, which stores computer program instructions that, when executed by a processor, cause the processor to perform the steps of the method as described in any of the first aspects above.

[0022] In this application, a direct-drive prohibition sign is determined based on the hybrid vehicle's operating information, thereby determining whether the hybrid vehicle prohibits the engine from entering direct-drive mode; a direct-drive request sign is determined based on the hybrid vehicle's ambient temperature and operating information, thereby determining whether the hybrid vehicle requests the engine to enter direct-drive mode; then, a direct-drive permission sign is determined based on the direct-drive prohibition and request signs, thereby determining whether the hybrid vehicle allows the engine to enter direct-drive mode; finally, the entry into or non-entry into direct-drive mode is controlled based on the direct-drive permission sign, which can accurately control whether the engine operates in direct-drive mode, thereby optimizing overall vehicle fuel consumption and ensuring the safety of engine-related hardware.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings: Figure 1 A flowchart illustrating a control method for a hybrid vehicle according to some embodiments of this application is shown; Figure 2 It shows Figure 1 A detailed flowchart illustrating the process of determining the prohibition of direct drive signs; Figure 3 It shows Figure 1 A detailed flowchart illustrating the process of determining the direct drive identifier in the request; Figure 4 A flowchart illustrating a control method for a hybrid vehicle according to other embodiments of this application is shown; Figure 5 It shows Figure 4 A diagram illustrating the data flow; Figure 6 A block diagram of a control device for a hybrid vehicle according to some embodiments of this application is shown; Figure 7 A schematic diagram of the structure of a control device for a hybrid vehicle according to some embodiments of this application is shown. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0027] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0028] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0029] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described.

[0030] To enable those skilled in the art to better understand this application, the application scenarios involved in this application will be briefly described first.

[0031] In plug-in hybrid electric vehicles (PHEVs), the engine, in direct-drive mode, directly connects power to the wheels via the transmission. This results in higher overall energy efficiency and lower fuel consumption compared to the engine's range-extender mode. However, because engine speed and vehicle speed are directly correlated in direct-drive mode, switching from direct-drive to range-extender mode is necessary if the vehicle speed drops sharply or the vehicle slips. This decouples the engine speed from the vehicle speed, preventing engine stalling or hardware damage due to reduced vehicle speed. Therefore, whether the engine operates in direct-drive mode affects not only fuel consumption but also the safety of related engine hardware.

[0032] In this embodiment, a direct drive prohibition sign is determined based on the hybrid vehicle's operating information, thereby determining whether the hybrid vehicle prohibits the engine from entering direct drive mode; a direct drive request sign is determined based on the hybrid vehicle's ambient temperature and operating information, thereby determining whether the hybrid vehicle requests the engine to enter direct drive mode; then, a direct drive permission sign is determined based on the direct drive prohibition sign and the direct drive request sign, thereby determining whether the hybrid vehicle allows the engine to enter direct drive mode; finally, the engine is controlled to enter or not enter direct drive mode based on the direct drive permission sign, which can accurately control whether the engine operates in direct drive mode, thereby optimizing overall vehicle fuel consumption and ensuring the safety of engine-related hardware.

[0033] Figure 1 A flowchart illustrating a control method for a hybrid vehicle according to some embodiments of this application is shown. Figure 1 As shown, the control method for hybrid vehicles may include the following steps: Step 101: Based on the operating information of the hybrid vehicle, determine the prohibition of direct drive sign, wherein the prohibition of direct drive sign is used to indicate whether the engine of the hybrid vehicle is prohibited from entering direct drive mode. Step 102: Based on the ambient temperature and operating information of the hybrid vehicle, determine the request for direct drive identifier, wherein the request for direct drive identifier is used to indicate whether the engine is requested to enter direct drive mode; Step 103: Based on the prohibited direct drive flag and the requested direct drive flag, determine the direct drive permitted flag, wherein the direct drive permitted flag is used to indicate whether the engine is allowed to enter direct drive mode; Step 104: Control the engine to enter direct drive mode based on the direct drive permission flag.

[0034] It should be noted that the executing entity in the embodiments of this application can be a computing service device with data processing, network communication, and program execution functions, or an electronic device capable of implementing the above functions, such as a vehicle control unit (VCU). The embodiments of this application and the following embodiments will be described using the VCU as an example of the executing entity.

[0035] The operating information of a hybrid vehicle may include multiple of the following: driving mode, Electronic Stability Control (ESC) off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery charge, target battery charge, maximum allowable battery discharge power, maximum allowable battery charging power, Transmission Control Unit (TCU) direct drive prohibited flag, engine initial start flag, driver required torque, maximum allowable wheel torque at the motor end, maximum allowable wheel torque at the battery end, and engine range extender mode start flag.

[0036] The driving modes include Normal, Sport, Snow, Mud, and others.

[0037] The ESC off flag is used to indicate whether the electronic stability controller is off. It has two states: set and reset. If the ESC off flag is set, it indicates that the electronic stability controller is off; if the ESC off flag is reset, it indicates that the electronic stability controller is on.

[0038] The vehicle reference speed is the speed of the vehicle relative to the ground. After the chassis calculates the vehicle reference speed, the VCU can obtain the vehicle reference speed from the chassis.

[0039] The TCU direct drive prohibition flag is used to indicate whether the transmission control unit prohibits direct drive. It has two states: set and reset. If the TCU direct drive prohibition flag is set, it indicates that the transmission control unit prohibits direct drive; if the TCU direct drive prohibition flag is reset, it indicates that the transmission control unit does not prohibit direct drive.

[0040] The engine first start flag is used to indicate whether the engine is starting for the first time. It has two states: set and reset. If the engine first start flag is set, it indicates that the engine is starting for the first time; if the engine first start flag is reset, it indicates that the engine is not starting for the first time.

[0041] The engine range extender mode start flag is used to indicate whether the engine range extender mode is activated. It has two states: set and reset. If the engine range extender mode start flag is set, it indicates that the engine range extender mode is activated; if the engine range extender mode start flag is reset, it indicates that the engine range extender mode is not activated.

[0042] The "No Direct Drive" indicator can use various symbols to represent whether the engine of a hybrid vehicle is prohibited from entering direct drive mode, such as a flag bit or a status code. In some examples, the "No Direct Drive" indicator can be a "No Direct Drive" flag bit, which has two states: set and reset. If the "No Direct Drive" flag bit is set, it indicates that the engine is prohibited from entering direct drive mode; if the "No Direct Drive" flag bit is reset, it indicates that the engine is not prohibited from entering direct drive mode.

[0043] The request for direct drive can be indicated by various flags, such as flag bits or status codes. In some examples, the request for direct drive can be a request for direct drive flag bit, which has two states: set and reset. If the request for direct drive flag bit is set, it indicates that the engine is requested to enter direct drive mode. If the request for direct drive flag bit is reset, it indicates that the engine is not requested to enter direct drive mode.

[0044] The direct drive permission indicator can use various indicators to represent whether the engine is allowed to enter direct drive mode, such as flag bits, status codes, etc. In some examples, the direct drive permission indicator can be a direct drive permission flag bit, which has two states: set and reset. If the direct drive permission flag bit is set, it means that the engine is allowed to enter direct drive mode. If the direct drive permission flag bit is reset, it means that the engine is not allowed to enter direct drive mode.

[0045] In step 101, the VCU can determine whether to prohibit the engine from entering direct drive mode (i.e., the direct drive prohibition sign) based on information related to driving mode, vehicle speed, braking, battery, TCU, and whether the engine is starting for the first time in the operation information, so as to accurately determine whether it is necessary to prohibit the engine from entering direct drive mode.

[0046] In some embodiments, the VCU may determine the prohibition of direct drive flag based on at least one of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery charge, target battery charge, maximum allowable battery discharge power, maximum allowable battery charging power, TCU prohibition of direct drive flag, and engine first start flag.

[0047] In the implementation process, the no-direct-drive flag can be determined based on any one of the following: driving mode, current battery level, target battery level, maximum allowable battery discharge power, maximum allowable battery charging power, TCU no-direct-drive flag, and engine first-time start flag. Alternatively, the no-direct-drive flag can be determined by combining the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery level, target battery level, maximum allowable battery discharge power, maximum allowable battery charging power, TCU no-direct-drive flag, and engine first-time start flag.

[0048] In step 102, the VCU can determine whether it is necessary to request the engine to enter direct drive mode (i.e., request direct drive indicator) based on ambient temperature, vehicle speed-related information, driver torque demand, battery-related information, and whether the engine is in range extender mode, so as to accurately determine whether the hybrid vehicle needs to request the engine to enter direct drive mode.

[0049] In some embodiments, the request for direct drive flag can be determined based on multiple of the following: front wheel speed, driver-demanded torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, engine range extender mode start flag, and ambient temperature.

[0050] In step 103, after determining the prohibited direct drive sign and the requested direct drive sign, the VCU can determine to allow the engine to enter the direct drive mode if the prohibited direct drive sign indicates that the engine is not prohibited from entering the direct drive mode, and the requested direct drive sign indicates that the engine is requested to enter the direct drive mode.

[0051] In some embodiments, the prohibited direct drive indicator includes a prohibited direct drive flag bit, the requested direct drive indicator includes a requested direct drive flag bit, and the direct drive permitted indicator includes a direct drive permitted flag bit. Determining the direct drive permitted indicator based on the prohibited direct drive indicator and the requested direct drive indicator includes: if the prohibited direct drive flag bit is reset and the requested direct drive flag bit is set, then setting the direct drive permitted flag bit to indicate that the engine is allowed to enter direct drive mode.

[0052] It is understandable that resetting the direct drive flag indicates that the engine is not prohibited from entering direct drive mode, while setting the direct drive flag indicates that the engine needs to enter direct drive mode. In this case, the direct drive enable flag is set, and vice versa.

[0053] In step 104, if the direct drive permission flag indicates that the engine is allowed to enter direct drive mode, then the VCU controls the engine to enter direct drive mode; otherwise, the VCU controls the engine not to enter direct drive mode.

[0054] During implementation, if the direct drive enable flag is set, the engine is controlled to enter direct drive mode; if the direct drive enable flag is reset, the engine is controlled not to enter direct drive mode.

[0055] This application embodiment determines a "prohibit direct drive" sign based on the hybrid vehicle's operating information, thereby determining whether the hybrid vehicle prohibits the engine from entering direct drive mode; it then determines a "request direct drive" sign based on the hybrid vehicle's ambient temperature and operating information, thereby determining whether the hybrid vehicle requests the engine to enter direct drive mode; finally, based on the "prohibit direct drive" and "request direct drive" signs, it determines a "direct drive permitted" sign, thereby determining whether the hybrid vehicle permits the engine to enter direct drive mode; and finally, based on the "direct drive permitted" sign, it controls whether the engine enters or does not enter direct drive mode, accurately controlling whether the engine operates in direct drive mode, thereby optimizing overall vehicle fuel consumption and ensuring the safety of engine-related hardware.

[0056] Figure 2 It shows Figure 1 A detailed flowchart illustrating the process for determining the prohibition of direct drive signs. (For example...) Figure 2 As shown, determining the prohibited direct drive sign may include the following steps: Step 201: Based on the driving mode and the ESC off flag, determine the first candidate no-direct-drive flag. Step 202: Based on the overall vehicle reference speed and the front wheel speed, determine the second candidate no-direct-drive sign position; Step 203: Based on the front wheel speed and brake pedal travel, determine the third candidate no-direct-drive sign position; Step 204: Based on the current battery level, target battery level, maximum allowable battery discharge power, or maximum allowable battery charging power, determine the fourth candidate direct drive prohibition flag. Step 205: Based on the TCU prohibit direct drive flag or the engine first start flag, determine the fifth candidate prohibit direct drive flag. Step 206: If any of the candidate prohibit direct drive flags from the first candidate prohibit direct drive flag to the fifth candidate prohibit direct drive flag is set, then the prohibit direct drive flag will be set to indicate that the engine is prohibited from entering direct drive mode.

[0057] In step 201, considering that some driving modes of the hybrid vehicle are associated with ESC and some driving modes are not associated with ESC, for driving modes associated with ESC, the VCU can determine the first candidate prohibit direct drive flag based on the driving mode and the ESC off flag. For driving modes not associated with ESC, the VCU can determine the first candidate prohibit direct drive flag based on the driving mode.

[0058] In some embodiments, if the driving mode is a first preset driving mode associated with the ESC off flag and the ESC off flag is set, then the first candidate prohibit direct drive flag is set; if the driving mode is a second preset driving mode not associated with the ESC off flag, then the first candidate prohibit direct drive flag is set.

[0059] The first preset driving mode and the second preset driving mode can be calibrated according to actual conditions, and this application does not impose any restrictions on them.

[0060] It is understandable that, except for the two cases where the driving mode is the first preset driving mode with the ESC off flag set and the ESC off flag is set, and the driving mode is the second preset driving mode without the ESC off flag set, the first candidate prohibit direct drive flag can be reset when the driving mode and the ESC off flag are in other situations.

[0061] In step 202, the VCU can compare the overall vehicle reference speed with the front wheel speed and determine the second candidate prohibition of direct drive sign position based on the comparison result.

[0062] In some embodiments, if the speed of the front wheels is greater than the sum of the vehicle reference speed and the first preset speed for a first preset duration, the second candidate no-direct-drive sign position is set; after the second candidate no-direct-drive sign position is set, if the speed of the front wheels is less than the sum of the vehicle reference speed and the second preset speed for a second preset duration, the second candidate no-direct-drive sign position is reset, wherein the first preset speed is greater than the second preset speed.

[0063] The first preset speed, the first preset duration, the second preset speed, and the second preset duration can be calibrated according to actual conditions, and this application does not impose any restrictions on them.

[0064] In step 203, the VCU can set the third candidate prohibit direct drive sign when both the front wheel speed and the brake pedal travel are greater than the calibrated values.

[0065] In some embodiments, if the front wheel speed and brake pedal travel meet preset conditions and remain for a third preset duration, the third candidate prohibition of direct drive sign position is set, wherein the preset conditions include the front wheel speed being greater than the third preset speed and the brake pedal travel being greater than the preset travel; if the front wheel speed and brake pedal travel do not meet the preset conditions and remain for a fourth preset duration after the third candidate prohibition of direct drive sign position is set, the third candidate prohibition of direct drive sign position is reset.

[0066] The third preset duration, the third preset speed, the preset distance, and the fourth preset duration can be calibrated according to actual conditions, and this application does not impose any restrictions on them.

[0067] In step 204, the VCU can determine the fourth candidate direct drive prohibition flag based on any one of the following: the current battery level, the difference between the current battery level and the target battery level, the maximum allowable discharge power of the battery, and the maximum allowable charging power of the battery.

[0068] In some embodiments, if the current battery level is less than a preset level, the difference between the current battery level and the target battery level is less than a preset level difference, the maximum allowable discharge power of the battery is less than a preset discharge power, or the maximum allowable charging power of the battery is less than a preset charging power, then the fourth candidate prohibit direct drive flag is set.

[0069] During implementation, if the current battery level, the difference between the current battery level and the target battery level, the maximum allowable discharge power of the battery, and the maximum allowable charging power of the battery do not meet the aforementioned conditions, the fourth candidate direct drive prohibition flag will be reset.

[0070] In step 205, the VCU can determine the fifth candidate direct drive prohibition flag based on either the TCU prohibition direct drive flag or the engine initial start flag.

[0071] In some embodiments, if the TCU prohibits direct drive flag or the engine is first started flag, the fifth candidate prohibits direct drive flag is set; otherwise, the fifth candidate prohibits direct drive flag is reset.

[0072] In step 206, the VCU can set the prohibition of direct drive flag to indicate that the engine is prohibited from entering direct drive mode if any of the first, second, third, fourth, or fifth candidate prohibition of direct drive flags is set; otherwise, it can reset the prohibition of direct drive flag.

[0073] By using at least one of the following as the basis for prohibiting the engine from entering direct drive mode: driving mode, ESC off sign, vehicle reference speed, front wheel speed, brake pedal travel, current battery charge, target battery charge, maximum allowable battery discharge power, maximum allowable battery charging power, TCU direct drive prohibition sign, and engine initial start sign, the safety, reliability, and driving comfort of hybrid vehicles can be effectively improved. By using the direct drive prohibition sign as a direct drive prohibition indicator, the vehicle controller can make a final decision based on the sign, simplifying the control logic.

[0074] Figure 3 It shows Figure 1 This is a detailed flowchart illustrating the process of determining the direct drive identifier in the request. For example... Figure 3 As shown, the request drive identifier can be determined through the following steps: Step 301: Based on ambient temperature and front wheel speed, determine the first candidate request direct drive flag. Step 302: Determine the second candidate direct drive request flag based on the driver's required torque, the maximum permissible wheel-side torque at the motor end, and the maximum permissible wheel-side torque at the battery end; Step 303: If both the first candidate request direct drive flag and the second candidate request direct drive flag are set, or if both the first candidate request direct drive flag and the engine range extender mode start flag are set, then the request direct drive flag will be set to indicate that the engine is requested to enter direct drive mode.

[0075] In step 301, the VCU can determine the vehicle speed threshold based on the ambient temperature, and then compare the front wheel speed with the vehicle speed threshold to determine the first candidate request direct drive flag.

[0076] In some embodiments, a vehicle speed threshold corresponding to the ambient temperature can be determined; if the front wheel speed is greater than the vehicle speed threshold, the first candidate request direct drive flag is set; if the front wheel speed is less than the difference between the vehicle speed threshold and the fourth preset speed after setting the first candidate request direct drive flag, the first candidate request direct drive flag is reset.

[0077] The fourth preset speed can be calibrated according to actual conditions, and this application does not impose any restrictions on it.

[0078] In the implementation process, the vehicle speed threshold corresponding to the ambient temperature can be determined by using a lookup table. This lookup table represents the correspondence between ambient temperature and vehicle speed thresholds, and it can be pre-calibrated experimentally. In some embodiments, the lookup table can refer to Table 1 below: Table 1

[0079] Taking the fourth preset vehicle speed of 3km / h and the ambient temperature of 20℃ as an example, the vehicle speed threshold can be determined to be 45km / h. If the front wheel speed is greater than 45km / h, the first candidate request direct drive flag will be set. If the front wheel speed is less than 42km / h, the first candidate request direct drive flag will be reset.

[0080] In step 302, the VCU can compare the driver's required torque with the maximum permissible wheel-side torque at the motor end, compare the maximum permissible wheel-side torque at the battery end with the maximum permissible wheel-side torque at the motor end, and determine the second candidate request direct drive flag based on the two comparison results.

[0081] In some embodiments, if both the driver's required torque and the maximum permissible wheel-side torque at the battery end are greater than the maximum permissible wheel-side torque at the motor end, the second candidate direct drive request flag is set; otherwise, the second candidate direct drive request flag is reset.

[0082] In step 303, if both the first candidate request direct drive flag and the second candidate request direct drive flag are set, or if both the first candidate request direct drive flag and the engine range extender mode start flag are set, then the VCU will request the direct drive flag to be set; otherwise, it will request the direct drive flag to be reset.

[0083] By integrating multi-dimensional information such as front wheel speed, driver's required torque, maximum allowable wheel-side torque of the motor, maximum allowable wheel-side torque of the battery, and engine range extender mode start flag, the request for direct drive flag can be determined, enabling more precise and smoother direct drive control while ensuring safety.

[0084] Figure 4 A flowchart illustrating a control method for a hybrid vehicle according to other embodiments of this application is shown. For example... Figure 4 As shown, the control method for hybrid vehicles may include the following steps: Step 401: Determine the no-direct-drive flag based on at least one of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery charge, target battery charge, maximum allowable battery discharge power, maximum allowable battery charging power, TCU no-direct-drive flag, and engine first-time start flag. Step 402: Based on the front wheel speed, driver's required torque, maximum allowable wheel-side torque at the motor end, maximum allowable wheel-side torque at the battery end, multiple factors including the engine range extender mode start flag and ambient temperature, determine the request direct drive flag. Step 403: If the direct drive flag is prohibited from being reset and a request is made to set the direct drive flag, then the direct drive permission flag is set to indicate that the engine is allowed to enter direct drive mode. Step 404: If the direct drive permission flag is in position, control the engine to enter direct drive mode.

[0085] Figure 5 It shows Figure 4 A diagram illustrating the data flow. (See attached diagram.) Figure 5 As shown, the direct drive prohibition sign is first calculated based on parameters such as driving mode to obtain the direct drive prohibition sign; the direct drive request sign is calculated based on parameters such as ambient temperature to obtain the direct drive request sign; and the direct drive permission sign is calculated based on these two signs to obtain the direct drive permission sign.

[0086] By determining the direct drive permission flag based on multi-dimensional data combinations, the engine can enter direct drive mode when the direct drive flag is in position, effectively improving the overall energy utilization efficiency of hybrid vehicles.

[0087] The following describes an embodiment of the apparatus described in this application, which can be used to execute the control device method for a hybrid vehicle in the above embodiments of this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the control device method for a hybrid vehicle described above in this application.

[0088] See Figure 6 This diagram illustrates a block diagram of the control device for a hybrid vehicle according to an embodiment of this application. Figure 6 As shown, the control device for a hybrid vehicle according to an embodiment of this application includes: a prohibition-direct-drive indicator determination unit 601, a request-direct-drive indicator determination unit 602, a direct-drive permission indicator determination unit 603, and a direct-drive mode control unit 604. The prohibition-direct-drive indicator determination unit 601 determines a prohibition-direct-drive indicator based on the hybrid vehicle's operating information, wherein the prohibition-direct-drive indicator indicates whether the hybrid vehicle's engine is prohibited from entering direct-drive mode. The request-direct-drive indicator determination unit 602 determines a request-direct-drive indicator based on the hybrid vehicle's ambient temperature and operating information, wherein the request-direct-drive indicator indicates whether the engine is requested to enter direct-drive mode. The direct-drive permission indicator determination unit 603 determines a direct-drive permission indicator based on the prohibition-direct-drive indicator and the request-direct-drive indicator, wherein the direct-drive permission indicator indicates whether the engine is allowed to enter direct-drive mode. The direct-drive mode control unit 604 controls the engine to enter direct-drive mode based on the direct-drive permission indicator.

[0089] In some embodiments, the operating information includes at least one of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery level, target battery level, maximum allowable battery discharge power, maximum allowable battery charging power, TCU prohibit direct drive flag, and engine start flag. The prohibit direct drive flag includes the prohibit direct drive flag. The prohibit direct drive flag determination unit 601 is further configured to determine the prohibit direct drive flag based on at least one of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery level, target battery level, maximum allowable battery discharge power, maximum allowable battery charging power, TCU prohibit direct drive flag, and engine start flag.

[0090] In some embodiments, the prohibition of direct drive sign determination unit 601 is further configured to determine a first candidate prohibition of direct drive sign based on driving mode and ESC off sign; determine a second candidate prohibition of direct drive sign based on vehicle reference speed and front wheel speed; determine a third candidate prohibition of direct drive sign based on front wheel speed and brake pedal travel; determine a fourth candidate prohibition of direct drive sign based on current battery charge, target battery charge, maximum allowable battery discharge power, or maximum allowable battery charging power; determine a fifth candidate prohibition of direct drive sign based on TCU prohibition of direct drive sign or engine initial start sign; if any of the first to fifth candidate prohibition of direct drive sign positions is set, the prohibition of direct drive sign position will be set to indicate that the engine is prohibited from entering direct drive mode.

[0091] In some embodiments, the prohibition of direct drive sign determination unit 601 is further configured to set the first candidate prohibition of direct drive sign to the position if the driving mode is a first preset driving mode associated with the ESC off sign and the ESC off sign is set; and to set the first candidate prohibition of direct drive sign to the position if the driving mode is a second preset driving mode not associated with the ESC off sign.

[0092] In some embodiments, the no-direct-drive sign determination unit 601 is further configured to set the second candidate no-direct-drive sign position if the front wheel speed is greater than the sum of the vehicle reference speed and the first preset speed for a first preset duration; and after the second candidate no-direct-drive sign position is set, if the front wheel speed is less than the sum of the vehicle reference speed and the second preset speed for a second preset duration, reset the second candidate no-direct-drive sign position, wherein the first preset speed is greater than the second preset speed.

[0093] In some embodiments, the prohibition of direct drive flag determination unit 601 is further configured to set the third candidate prohibition of direct drive flag if the front wheel speed and brake pedal travel meet preset conditions and continue for a third preset duration, wherein the preset conditions include the front wheel speed being greater than the third preset speed and the brake pedal travel being greater than the preset travel; and if the front wheel speed and brake pedal travel do not meet the preset conditions and continue for a fourth preset duration after the third candidate prohibition of direct drive flag is set, then the third candidate prohibition of direct drive flag is reset.

[0094] In some embodiments, the prohibition of direct drive flag determination unit 601 is further configured to set the fourth candidate prohibition of direct drive flag if the current battery power is less than the preset power, the difference between the current battery power and the target battery power is less than the preset power difference, the maximum allowable discharge power of the battery is less than the preset discharge power, or the maximum allowable charging power of the battery is less than the preset charging power.

[0095] In some embodiments, the prohibition of direct drive flag determination unit 601 is further configured to set the fifth candidate prohibition of direct drive flag if the TCU prohibition of direct drive flag is set or the engine first start flag is set.

[0096] In some embodiments, the operating information includes multiples of the following: front wheel speed, driver-demanded torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, and engine range extender mode start flag. The request direct drive flag includes a request direct drive flag. The request direct drive flag determination unit 602 is further configured to determine the request direct drive flag based on multiples of the following: front wheel speed, driver-demanded torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, engine range extender mode start flag, and ambient temperature.

[0097] In some embodiments, the request direct drive flag determination unit 602 is further configured to determine a first candidate request direct drive flag based on ambient temperature and front wheel speed; determine a second candidate request direct drive flag based on driver demand torque, maximum permissible wheel-side torque at the motor end and maximum permissible wheel-side torque at the battery end; if both the first candidate request direct drive flag and the second candidate request direct drive flag are set, or if both the first candidate request direct drive flag and the engine range extender mode start flag are set, then the request direct drive flag will be set to indicate that the engine is requested to enter direct drive mode.

[0098] In some embodiments, the request direct drive flag determination unit 602 is further configured to determine the vehicle speed threshold corresponding to the ambient temperature; if the front wheel speed is greater than the vehicle speed threshold, the first candidate request direct drive flag is set; if the front wheel speed is less than the difference between the vehicle speed threshold and the fourth preset speed after setting the first candidate request direct drive flag, the first candidate request direct drive flag is reset.

[0099] In some embodiments, the request direct drive identifier determination unit 602 is further configured to set the second candidate request direct drive identifier if both the driver's required torque and the maximum permissible wheel-side torque at the battery end are greater than the maximum permissible wheel-side torque at the motor end.

[0100] In some embodiments, the prohibited direct drive flag includes a prohibited direct drive flag bit, the requested direct drive flag includes a requested direct drive flag bit, and the direct drive permitted flag includes a direct drive permitted flag bit. The direct drive permitted flag determination unit 603 can also be used to set the direct drive permitted flag bit if the prohibited direct drive flag bit is reset and the requested direct drive flag bit is set, so as to indicate that the engine is allowed to enter the direct drive mode.

[0101] Based on the same inventive concept, this application also provides a control device for a hybrid vehicle, see reference. Figure 7The diagram shows a schematic of the structure of a control device for a hybrid vehicle according to an embodiment of this application. The control device for the hybrid vehicle includes one or more memories 704, one or more processors 702, and at least one computer program (computer program instruction) stored in the memory 704 and executable on the processor 702. When the processor 702 executes the computer program, it implements the method described above.

[0102] Among them, Figure 7 In this document, a bus architecture (represented by bus 700) is used. Bus 700 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 702 and memory represented by memory 704. Bus 700 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 705 provides an interface between bus 700 and receiver 701 and transmitter 703. Receiver 701 and transmitter 703 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 702 is responsible for managing bus 700 and general processing, while memory 704 can be used to store data used by processor 702 during operation.

[0103] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, cause the processor to perform the steps of the method described above.

[0104] Based on the same inventive concept, embodiments of this application provide a computer program product, including a computer program, which, when executed by a processor, causes the processor to perform the steps of the method described above.

[0105] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0106] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0107] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0108] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing computer program instructions, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0109] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method for a hybrid vehicle, characterized in that, include: Based on the operating information of the hybrid vehicle, a prohibition sign for direct drive is determined, wherein the prohibition sign for direct drive is used to indicate whether the engine of the hybrid vehicle is prohibited from entering direct drive mode. Based on the ambient temperature of the hybrid vehicle and the operating information, a direct drive request identifier is determined, wherein the direct drive request identifier is used to indicate whether the engine is requested to enter direct drive mode; Based on the prohibited direct drive flag and the requested direct drive flag, a direct drive permitted flag is determined, wherein the direct drive permitted flag is used to indicate whether the engine is allowed to enter direct drive mode; Based on the direct drive permission flag, the engine is controlled to enter direct drive mode.

2. The control method for a hybrid vehicle according to claim 1, characterized in that, The operating information includes at least one of the following: driving mode, Electronic Stability Control (ESC) off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery level, target battery level, maximum allowable battery discharge power, maximum allowable battery charging power, Transmission Control Unit (TCU) prohibit direct drive flag, and engine initial start flag. The prohibition of direct drive flag includes a prohibition of direct drive flag. Determining the prohibition of direct drive flag based on the operating information of the hybrid vehicle includes: The direct drive prohibition flag is determined based on at least one of the following: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery charge, target battery charge, maximum allowable battery discharge power, maximum allowable battery charging power, TCU direct drive prohibition flag, and engine initial start flag.

3. The control method for a hybrid vehicle according to claim 2, characterized in that, The determination of the "no direct drive" flag based on at least one of the following includes: driving mode, ESC off flag, vehicle reference speed, front wheel speed, brake pedal travel, current battery charge, target battery charge, maximum allowable battery discharge power, maximum allowable battery charging power, TCU no direct drive flag, and engine initial start flag. Based on the driving mode and the ESC off flag, a first candidate prohibition of direct drive flag is determined; Based on the overall vehicle reference speed and the front wheel speed, a second candidate no-direct-drive sign position is determined; Based on the front wheel speed and the brake pedal travel, a third candidate prohibition of direct drive sign position is determined; Based on the current battery level, the target battery level, the maximum allowable discharge power of the battery, or the maximum allowable charging power of the battery, determine the fourth candidate prohibit direct drive flag bit; Based on the TCU prohibit direct drive flag or the engine initial start flag, a fifth candidate prohibit direct drive flag is determined. If any one of the candidate prohibit direct drive flags from the first candidate prohibit direct drive flag to the fifth candidate prohibit direct drive flag is set, then the prohibit direct drive flag is set to indicate that the engine is prohibited from entering direct drive mode.

4. The control method for a hybrid vehicle according to claim 3, characterized in that, The step of determining the first candidate prohibition of direct drive flag based on the driving mode and the ESC off flag includes: If the driving mode is the first preset driving mode associated with the ESC off flag, and the ESC off flag is set, then the first candidate prohibit direct drive flag is set. If the driving mode is the second preset driving mode without the ESC off flag, then the first candidate prohibit direct drive flag will be set.

5. The control method for a hybrid vehicle according to claim 3, characterized in that, The determination of the second candidate no-direct-drive sign position based on the overall vehicle reference speed and the front wheel speed includes: If the speed of the front wheel is greater than the sum of the reference speed of the whole vehicle and the first preset speed and continues for a first preset duration, then the second candidate prohibition of direct drive sign will be moved to the next position. After the second candidate no direct drive sign is in position, if the front wheel speed is less than the sum of the overall vehicle reference speed and the second preset speed for a second preset duration, the second candidate no direct drive sign is reset, wherein the first preset speed is greater than the second preset speed.

6. The control method for a hybrid vehicle according to claim 3, characterized in that, The determination of the third candidate no-direct-drive sign position based on the front wheel speed and the brake pedal travel includes: If the front wheel speed and the brake pedal travel meet the preset conditions and continue for a third preset duration, then the third candidate prohibition of direct drive sign will be set. The preset conditions include the front wheel speed being greater than the third preset speed and the brake pedal travel being greater than the preset travel. If, after the third candidate prohibition of direct drive sign position is set, the front wheel speed and the brake pedal travel do not meet the preset conditions and continue for a fourth preset duration, then the third candidate prohibition of direct drive sign position will be reset.

7. The control method for a hybrid vehicle according to claim 3, characterized in that, The step of determining the fourth candidate prohibit direct drive flag based on the current battery level, the target battery level, the maximum allowable discharge power of the battery, or the maximum allowable charging power of the battery includes: If the current battery level is less than the preset battery level, the difference between the current battery level and the target battery level is less than the preset battery level difference, the maximum allowable discharge power of the battery is less than the preset discharge power, or the maximum allowable charging power of the battery is less than the preset charging power, then the fourth candidate direct drive prohibition flag will be set.

8. The control method for a hybrid vehicle according to claim 3, characterized in that, The determination of the fifth candidate direct drive prohibition flag based on the TCU prohibition flag or the engine initial start flag includes: If the TCU prohibits direct drive flag is in position, or the engine is in initial start flag position, then the fifth candidate prohibits direct drive flag will be in position.

9. The control method for a hybrid vehicle according to claim 1, characterized in that, The operating information includes multiple of the following: front wheel speed, driver-required torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, and engine range extender mode activation flag. The requested direct drive identifier includes a requested direct drive flag. Determining the requested direct drive identifier based on the ambient temperature of the hybrid vehicle and the operating information includes: The request for direct drive flag is determined based on multiple factors including the front wheel speed, driver's required torque, maximum allowable wheel-side torque at the motor end, maximum allowable wheel-side torque at the battery end, engine range extender mode start flag, and the ambient temperature.

10. The control method for a hybrid vehicle according to claim 9, characterized in that, The determination of the request direct drive flag based on multiples of the following: front wheel speed, driver's required torque, maximum permissible wheel-side torque at the motor end, maximum permissible wheel-side torque at the battery end, engine range extender mode start flag, and ambient temperature, includes: Based on the ambient temperature and the front wheel speed, a first candidate request for direct drive flag is determined; Based on the driver's required torque, the maximum permissible wheel-side torque at the motor end, and the maximum permissible wheel-side torque at the battery end, determine the second candidate direct drive request flag. If both the first candidate request direct drive flag and the second candidate request direct drive flag are set, or if both the first candidate request direct drive flag and the engine range extender mode start flag are set, then the request direct drive flag is set to indicate a request for the engine to enter direct drive mode.

11. The control method for a hybrid vehicle according to claim 10, characterized in that, The step of determining the first candidate direct drive request flag based on the ambient temperature and the front wheel speed includes: Determine the vehicle speed threshold corresponding to the ambient temperature; If the front wheel speed is greater than the speed threshold, then the first candidate request direct drive flag is set to zero. If the front wheel speed is less than the difference between the speed threshold and the fourth preset speed after the first candidate direct drive request flag is set, then the first candidate direct drive request flag is reset.

12. The control method for a hybrid vehicle according to claim 10, characterized in that, The step of determining the second candidate direct drive request flag based on the driver's required torque, the maximum permissible wheel-side torque at the motor end, and the maximum permissible wheel-side torque at the battery end includes: If both the driver's required torque and the maximum permissible wheel-side torque at the battery end are greater than the maximum permissible wheel-side torque at the motor end, then the second candidate direct drive request flag will be set to the left.

13. The control method for a hybrid vehicle according to claim 1, characterized in that, The prohibited direct drive identifier includes a prohibited direct drive flag bit, the requested direct drive identifier includes a requested direct drive flag bit, and the permitted direct drive identifier includes a permitted direct drive flag bit. Determining the permitted direct drive identifier based on the prohibited direct drive identifier and the requested direct drive identifier includes: If the prohibited direct drive flag is reset and the requested direct drive flag is set, then the direct drive allowed flag is set to indicate that the engine is allowed to enter direct drive mode.

14. A control device for a hybrid vehicle, comprising a processor and a memory, characterized in that, The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, it implements the steps of the method as described in any one of claims 1 to 13.

15. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions that, when executed by a processor, cause the processor to perform the steps of the method as described in any one of claims 1 to 13.

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