Hybrid vehicle and method, device and medium for switching between series and parallel driving modes thereof

Abstract

The application discloses a hybrid electric vehicle and a series-parallel driving mode switching method, device and medium thereof. The switching method comprises the following steps: acquiring the current driving mode of the hybrid electric vehicle and driving force information in the current driving mode; judging whether the driving force information meets the switching condition corresponding to the current driving mode; if yes, controlling the hybrid electric vehicle to switch from the current driving mode to another driving mode different from the current driving mode. The technical scheme of the application judges whether the driving force information in the current driving mode meets the switching condition corresponding to the current driving mode, and performs mode switching when the switching condition corresponding to the current driving mode is met, so that the driving mode is switched in advance when the driving force in another driving mode is greater, thereby reducing the reduction range of the vehicle driving force in the driving mode switching process, ensuring the continuity of the driving force, and improving the driving experience.

Description

Technical Field

[0001] This invention relates to the field of automotive control technology, and in particular to a hybrid electric vehicle and its series-parallel drive mode switching method, device and medium. Background Technology

[0002] The dual-motor series-parallel hybrid configuration has proven to be a relatively easy-to-implement hybrid power configuration in recent years, and it facilitates switching between hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles (PHEVs). At low and medium speeds, the drive motor drives the vehicle while the engine is off or operating in its economical power generation range; this is the series drive mode. At medium and high speeds, the clutch engages, and the engine directly drives the vehicle at a fixed speed ratio; this is the parallel drive mode. Furthermore, the engine load can be adjusted via the drive motor, allowing the engine to still operate in a low-fuel-consumption economical range.

[0003] Because the vehicle's operating conditions vary greatly during actual driving, involving frequent switching between series and parallel drive modes, a reasonable series-parallel switching method should balance both fuel consumption and driving smoothness. Since the drive motor independently drives the vehicle in series mode, while the drive motor and engine work together in parallel mode, there may be situations where the maximum driving force in parallel mode is greater than that in series mode when the battery has sufficient charge. If the driver's required driving force has reached the maximum driving force of the current drive mode, and another drive mode offers greater driving force, then the driver should switch to the other drive mode.

[0004] The current control method calculates the maximum driving capacity in the series-parallel mode in real time. When it finds that there is a greater driving force in another driving mode, it switches the driving mode. This method only determines that a switch is needed when the driving force is already insufficient. Since the switch takes time, the insufficient driving force will continue for a period of time. After the driving mode switch is completed, the driving force starts to increase again. This process causes the driving force to change discontinuously, resulting in poor operational stability. Summary of the Invention

[0005] This invention provides a hybrid electric vehicle and its series-parallel drive mode switching method, device and medium to overcome the defects in the prior art, reduce the reduction of the vehicle's driving force during the drive mode switching process, ensure the continuity of driving force, and improve the operation stability and reliability of the hybrid electric vehicle.

[0006] In a first aspect, the present invention provides a method for switching between series and parallel drive modes in a hybrid electric vehicle, used to control the hybrid electric vehicle to switch drive modes. The hybrid electric vehicle includes at least an engine, a generator, a power battery, and a drive motor. The drive modes of the hybrid electric vehicle include a series drive mode and a parallel drive mode. The method for switching between series and parallel drive modes in a hybrid electric vehicle includes:

[0007] The system acquires the current driving mode of the hybrid vehicle and the driving force information under the current driving mode; wherein, when the current driving mode is the series driving mode, the driving force information includes the current first maximum driving force of the vehicle, the current maximum driving force of the vehicle under the parallel driving mode, the future maximum driving force of the vehicle under the series driving mode, the future maximum driving force of the vehicle under the parallel driving mode, and the current required vehicle driving force; when the current driving mode is the parallel driving mode, the driving force information includes the current second maximum driving force of the vehicle, the future maximum driving force of the vehicle under the series driving mode, the future maximum driving force of the vehicle under the parallel driving mode, and the current required vehicle driving force.

[0008] Determine whether the driving force information meets the switching conditions corresponding to the current driving mode; when the current driving mode is the series driving mode, the switching conditions are: the difference between the current first maximum driving force of the vehicle and the current maximum driving force of the vehicle in the parallel driving mode is less than a first preset difference; the difference between the future maximum driving force of the vehicle in the parallel driving mode and the future maximum driving force of the vehicle in the series driving mode is greater than a second preset difference; and the difference between the current first maximum driving force of the vehicle and the current required vehicle driving force is less than a third preset difference; when the current driving mode is the parallel driving mode, the switching conditions are: the difference between the future maximum driving force of the vehicle in the series driving mode and the future maximum driving force of the vehicle in the parallel driving mode is greater than a fourth preset difference; and the difference between the current second maximum driving force of the vehicle and the current required vehicle driving force is greater than a fifth preset difference.

[0009] If so, the hybrid vehicle is controlled to switch from the current driving mode to another driving mode different from the current driving mode.

[0010] Secondly, the present invention also provides a hybrid electric vehicle series-parallel drive mode switching device for controlling the hybrid electric vehicle to switch drive modes. The hybrid electric vehicle includes at least an engine, a generator, a power battery, and a drive motor. The drive modes of the hybrid electric vehicle include a series drive mode and a parallel drive mode. The hybrid electric vehicle series-parallel drive mode switching device includes:

[0011] An acquisition module is used to acquire the current driving mode of the hybrid vehicle and the driving force information under the current driving mode; wherein, when the current driving mode is the series driving mode, the driving force information includes the current first maximum driving force of the vehicle, the current maximum driving force of the vehicle under the parallel driving mode, the future maximum driving force of the vehicle under the series driving mode, the future maximum driving force of the vehicle under the parallel driving mode, and the current required vehicle driving force; when the current driving mode is the parallel driving mode, the driving force information includes the current second maximum driving force of the vehicle, the future maximum driving force of the vehicle under the series driving mode, the future maximum driving force of the vehicle under the parallel driving mode, and the current required vehicle driving force.

[0012] The judgment module is used to determine whether the driving force information meets the switching conditions corresponding to the current driving mode; when the current driving mode is the series driving mode, the switching conditions are that the difference between the current first maximum driving force of the vehicle and the current maximum driving force of the vehicle in the parallel driving mode is less than a first preset difference, the difference between the future maximum driving force of the vehicle in the parallel driving mode and the future maximum driving force of the vehicle in the series driving mode is greater than a second preset difference, and the difference between the current first maximum driving force of the vehicle and the current required vehicle driving force is less than a third preset difference; when the current driving mode is the parallel driving mode, the switching conditions are that the difference between the future maximum driving force of the vehicle in the series driving mode and the future maximum driving force of the vehicle in the parallel driving mode is greater than a fourth preset difference, and the difference between the current second maximum driving force of the vehicle and the current required vehicle driving force is greater than a fifth preset difference.

[0013] The drive mode switching module is used to control the hybrid vehicle to switch from the current drive mode to another drive mode that is different from the current drive mode.

[0014] Thirdly, the present invention also provides a computer-readable storage medium storing computer instructions for causing a processor to execute and implement any of the switching methods described above.

[0015] Fourthly, the present invention also provides a hybrid electric vehicle, characterized in that it includes at least an engine, a generator, a power battery, a drive motor, and a control system;

[0016] The control system is used to execute any of the above-described hybrid electric vehicle series-parallel drive mode switching methods.

[0017] The technical solution of this invention obtains the current driving mode of a hybrid electric vehicle and the driving force information under the current driving mode, and determines whether the driving force information meets the switching conditions corresponding to the current driving mode. When the driving force information meets the switching conditions corresponding to the current driving mode, the hybrid electric vehicle is controlled to switch from the current driving mode to another driving mode different from the current driving mode. Since the driving force information and switching conditions not only consider the current maximum driving force of the vehicle, but also the future maximum driving force of the vehicle, the driving mode can be switched in advance when there is a greater driving force in the future driving mode. This reduces the decrease in the vehicle's driving force during the driving mode switching process, ensures the continuity of driving force, and improves the operational stability and reliability of the hybrid electric vehicle.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a structural block diagram of a hybrid electric vehicle provided in Embodiment 1 of the present invention;

[0021] Figure 2 This is a flowchart of a method for switching between series and parallel drive modes in a hybrid electric vehicle according to Embodiment 2 of the present invention;

[0022] Figure 3 This is a flowchart of a method for obtaining the current first maximum driving force according to Embodiment 2 of the present invention;

[0023] Figure 4 This is a flowchart of a method for obtaining the current second maximum driving force according to Embodiment 2 of the present invention;

[0024] Figure 5 This is a flowchart of a method for obtaining the future maximum driving force of a vehicle in a series drive mode, provided in Embodiment 2 of the present invention.

[0025] Figure 6 This is a flowchart of a method for obtaining the future maximum driving force of a vehicle in parallel drive mode, provided in Embodiment 2 of the present invention.

[0026] Figure 7This is a structural block diagram of a hybrid electric vehicle series-parallel drive mode switching device provided in Embodiment 3 of the present invention. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] Example 1

[0030] This invention provides a hybrid electric vehicle. Figure 1 This is a structural block diagram of a hybrid electric vehicle provided in Embodiment 1 of the present invention, with reference to... Figure 1 As shown, a hybrid electric vehicle mainly includes an engine 1, a generator 2, a power battery (not shown in the figure), a drive motor 3, and a control system (not shown in the figure). The power battery can supply power to the drive motor 3 and other high-voltage or non-high-voltage components in the hybrid electric vehicle. The engine 1 can provide kinetic energy to drive the hybrid electric vehicle and / or, after conversion by the generator 3, supply power to the drive motor 4 and other high-voltage or non-high-voltage components in the hybrid electric vehicle. The kinetic energy provided by the engine 1 can also be converted by the generator 2 to charge the power battery.

[0031] In addition, such as Figure 1As shown, the hybrid electric vehicle also includes a clutch 3, a differential 5, and a reduction gear 6. The engine 1 and the generator 2 are connected via the reduction gear 6. The hybrid electric vehicle has two driving modes: a series drive mode and a parallel drive mode. In the series drive mode, the clutch is disengaged, and the engine 1 drives the generator 2 to generate electricity via the reduction gear 6. The electricity generated by the generator 2 and the power battery are supplied to the drive motor 3, which drives the vehicle. In the parallel drive mode, the clutch 3 is engaged. In this mode, the engine 1 directly drives the vehicle, while the power battery supplies electricity to the drive motor 3, which drives the vehicle. The driving mode of the hybrid electric vehicle is controlled by its control system.

[0032] The control system of the hybrid electric vehicle provided in this embodiment of the invention integrates the series-parallel drive mode switching device of the hybrid electric vehicle provided in this embodiment of the invention, which can execute the series-parallel drive mode switching method of the hybrid electric vehicle provided in this embodiment of the invention. Therefore, it can have the corresponding structure and features to execute the control method of the plug-in hybrid electric vehicle provided in this embodiment of the invention, and can achieve the beneficial effects of the control method of the plug-in hybrid electric vehicle provided in this embodiment of the invention. The similarities can be referred to in the following description.

[0033] Example 2

[0034] This invention provides a method for switching the series-parallel drive mode of a hybrid electric vehicle, which can be used to control the hybrid electric vehicle to switch drive modes. This control method can be executed by the hybrid electric vehicle series-parallel drive mode switching device provided in this invention. The switching device can be implemented in hardware and / or software and can be integrated into the control system of the hybrid electric vehicle. Figure 2 This is a flowchart of a hybrid electric vehicle series-parallel drive mode switching method provided in Embodiment 2 of the present invention, as shown below. Figure 2 As shown, the control method includes:

[0035] S110: Obtain the current driving mode of the hybrid vehicle, and the driving force information under the current driving mode.

[0036] The hybrid electric vehicle's drive modes include series drive mode and parallel drive mode. When the current drive mode is series drive mode, the drive force information includes the current maximum vehicle drive force, the current maximum vehicle drive force in parallel drive mode, the future maximum vehicle drive force in series drive mode, the future maximum vehicle drive force in parallel drive mode, and the current required vehicle drive force. When the current drive mode is parallel drive mode, the drive force information includes the current maximum vehicle drive force, the future maximum vehicle drive force in series drive mode, the future maximum vehicle drive force in parallel drive mode, and the current required vehicle drive force.

[0037] Specifically, in series drive mode, the engine drives the generator to produce electricity. The electricity generated by the generator and the power battery are then supplied to the drive motor, which independently drives the hybrid vehicle. In parallel drive mode, the engine directly drives the hybrid vehicle, while the power battery supplies electricity to the drive motor, which in turn drives the hybrid vehicle. In other words, the engine and drive motor jointly drive the hybrid vehicle. Thus, the current drive mode of the hybrid vehicle can be determined based on the status of the engine, generator, and power battery.

[0038] The current maximum driving force of the vehicle is the maximum driving force of the hybrid vehicle when it is in series drive mode. Because the direct power source of the hybrid vehicle in series drive mode is the drive motor, the first maximum driving force can be determined by the operating state of the drive motor. The current maximum driving force of the vehicle is the maximum driving force of the vehicle when it is in parallel drive mode. Because the direct power source of the hybrid vehicle in parallel drive mode is the engine and the drive motor, the second maximum driving force can be determined by the combined operating states of the engine and the drive motor.

[0039] The future maximum driving force of the vehicle in series drive mode and in parallel drive mode can be the estimated maximum driving force of the vehicle in series drive mode and in parallel drive mode after a first preset time, determined based on the current vehicle speed of the hybrid vehicle and the operating status and capability of the electric motor, generator, power battery, and / or drive motor. The first preset time can be jointly determined based on the requirements for the continuity of the hybrid vehicle's driving force and the requirements for the frequency of drive mode switching. The first preset time can be a period of time after the current time or the time elapsed in one or more calculation cycles after the current calculation cycle of the hybrid vehicle. For example, if the requirement for the continuity of the hybrid vehicle's driving force is high, the first preset time can be set to a longer time; if the requirement for the continuity of the hybrid vehicle's driving force is low and the required drive mode switching frequency is low, the first preset time can be set to a shorter time. In an exemplary embodiment, the first preset time can be 5 seconds, meaning that the future maximum driving force of the vehicle in series drive mode can be the maximum driving force of the vehicle 5 seconds later in series drive mode, and the future maximum driving force of the vehicle in parallel drive mode can be the maximum driving force of the vehicle 5 seconds later in parallel drive mode.

[0040] The current demand for vehicle driving force is determined based on the driver's current needs. For example, the current demand for vehicle driving force can be determined by looking up a table based on the accelerator pedal opening and the current vehicle speed.

[0041] Understandably, in series drive mode, engine speed and vehicle speed are decoupled, so the engine power can be at its maximum. In this mode, the engine can output maximum power through the generator. If the power battery still has available discharge power, the power of the drive motor is basically equal to the generator's power plus the power battery's discharge power. However, the maximum drive power of the drive motor is not greater than its own maximum power. In parallel drive mode, engine speed and vehicle speed are coupled and have a fixed speed ratio. The engine can directly drive the vehicle, and the maximum drive power that the engine can provide is equal to its maximum drive power at its current speed. The maximum drive power that the engine can provide plus the power battery's available discharge power is equal to the vehicle's maximum drive power in parallel drive mode. Therefore, when the vehicle speed is high, there may be situations where the vehicle's maximum drive power in parallel mode is greater than that in series mode.

[0042] S120. Determine whether the driving force information meets the switching conditions corresponding to the current driving mode; if so, execute S130.

[0043] Specifically, when the current driving mode is series driving mode, the switching conditions are: the difference between the current maximum driving force of the vehicle and the current maximum driving force of the vehicle in parallel driving mode is less than a first preset difference; the difference between the future maximum driving force of the vehicle in parallel driving mode and the future maximum driving force of the vehicle in series driving mode is greater than a second preset difference; and the difference between the current maximum driving force of the vehicle and the current required driving force of the vehicle is less than a third preset difference. When the current driving mode is parallel driving mode, the switching conditions are: the difference between the future maximum driving force of the vehicle in series driving mode and the future maximum driving force of the vehicle in parallel driving mode is greater than a fourth preset difference; and the difference between the current maximum driving force of the vehicle and the current required driving force of the vehicle is greater than a fifth preset difference.

[0044] The first, second, and third preset differences can be driving force differences preset according to the requirements for the continuity of driving force of the hybrid vehicle. In one exemplary embodiment, the first preset difference can be 50 Nm; in another exemplary embodiment, the second preset difference can be 50 Nm; and in yet another exemplary embodiment, the third preset difference can be 100 Nm. In other embodiments, the first, second, and third preset differences can also be other values. This embodiment is only for illustrative purposes, and the first, second, and third preset differences can all be set according to actual needs. The fourth and fifth preset differences are also driving force differences preset according to the requirements for the continuity of driving force of the hybrid vehicle. In one exemplary embodiment, the fourth preset difference can be 50 Nm; in another embodiment, the fifth preset difference can be 100 Nm. In other embodiments, the fourth and fifth preset differences can also be other values. This embodiment is only for illustrative purposes, and the fourth and fifth preset differences can all be set according to actual needs.

[0045] Specifically, if the current driving mode is series drive mode, then based on the acquired driving force information, the switching conditions for switching from series drive mode to parallel drive mode are considered met when the difference between the current maximum driving force of the vehicle and the current maximum driving force of the vehicle in parallel drive mode is less than a first preset difference, the difference between the future maximum driving force of the vehicle in parallel drive mode and the future maximum driving force of the vehicle in series drive mode is greater than a second preset difference, and the difference between the current maximum driving force of the vehicle and the current required driving force of the vehicle is less than a third preset difference. Conversely, if the current driving mode is parallel drive mode, then based on the acquired driving force information, the switching conditions for switching from parallel drive mode to series drive mode are considered met when the difference between the future maximum driving force of the vehicle in series drive mode and the future maximum driving force of the vehicle in parallel drive mode is greater than a fourth preset difference, and the difference between the current maximum driving force of the vehicle and the current required driving force of the vehicle is greater than a fifth preset difference.

[0046] S130: Controls the hybrid vehicle to switch from the current driving mode to another driving mode different from the current driving mode.

[0047] It is understandable that if the current driving mode is a series driving mode, then the other driving mode that is different from the current driving mode is a parallel driving mode; correspondingly, if the current driving mode is a parallel driving mode, then the other driving mode that is different from the current driving mode is a series driving mode.

[0048] In an exemplary embodiment, taking the current driving mode of the hybrid vehicle as a series driving mode, with a first preset difference of 50 Nm, a second preset difference of 50 Nm, and a third preset difference of 100 Nm as an example, when the difference between the current maximum driving force of the vehicle and the current maximum driving force of the vehicle in the parallel driving mode is less than 50 Nm, the difference between the future maximum driving force of the vehicle in the parallel driving mode and the future maximum driving force of the vehicle in the series driving mode is greater than 50 Nm, and the difference between the current maximum driving force of the vehicle and the current required driving force of the vehicle is less than 100 Nm, the hybrid vehicle is switched from the series driving mode to the parallel driving mode. This reduces the reduction in the driving force of the vehicle during the driving mode switching process by considering the future maximum driving force of the vehicle.

[0049] In another embodiment, taking the current driving mode of the hybrid vehicle as parallel driving mode, with a fourth preset difference of 50Nm and a fifth preset difference of 100Nm as an example, when the difference between the future maximum driving force of the vehicle in series driving mode and the future maximum driving force of the vehicle in parallel driving mode is greater than 50Nm, and the difference between the current second maximum driving force of the vehicle and the current required driving force of the vehicle is greater than 100Nm, the hybrid vehicle is switched from parallel driving mode to series driving mode. Similarly, by considering the future maximum driving force of the vehicle, the driving mode is switched in advance to reduce the reduction in the driving force of the vehicle during the driving mode switching process and improve driving stability.

[0050] In this embodiment, by acquiring the current driving mode of the hybrid vehicle and the driving force information under the current driving mode, it is determined whether the driving force information meets the switching conditions corresponding to the current driving mode. When the driving force information meets the switching conditions corresponding to the current driving mode, the hybrid vehicle is controlled to switch from the current driving mode to another driving mode different from the current driving mode. Since the driving force information and switching conditions not only consider the current maximum driving force of the vehicle, but also the future maximum driving force of the vehicle, the driving mode can be switched in advance when there is a greater driving force in the future driving mode. This reduces the decrease in the vehicle's driving force during the driving mode switching process, ensures the continuity of driving force, and improves the operational stability and reliability of the hybrid vehicle.

[0051] Based on the above embodiments, optionally, Figure 3 This is a flowchart illustrating a method for obtaining the current first maximum driving force according to Embodiment 2 of the present invention. Figure 3 As shown, the methods for obtaining the current first maximum driving force include:

[0052] S210, obtain the current first maximum mechanical power TmMPwrMaxSe of the drive motor, the current speed V1 of the drive motor, and the actual maximum driving force F1 of the drive motor.

[0053] Among them, the current first maximum mechanical power TmMPwrMaxSe of the drive motor is the current maximum available mechanical power of the drive motor; the actual maximum driving force F1 of the drive motor can be the current maximum driving force reported by the drive motor.

[0054] In an optional embodiment, the specific method for obtaining the current first maximum mechanical power TmMPwrMaxSe of the drive motor is as follows: Obtain the current output power GmEPwr of the generator, the current discharge power BmsDisPwr of the power battery, and the efficiency η1 of the drive motor at its current speed and torque; then, based on the current output power GmEPwr of the generator, the current discharge power BmsDisPwr of the power battery, and the efficiency η1 of the drive motor at its current speed and torque, calculate the current first maximum mechanical power TmMPwrMaxSe of the drive motor using a second calculation formula; wherein the second calculation formula is:

[0055] TmMPwrMaxSe=(GmEPwr+BmsDisPwr)*eta1.

[0056] The efficiency η1 of the drive motor at its current speed and torque can be obtained by looking up the drive motor efficiency table based on the current speed and torque of the drive motor. The current output electrical power GmEPwr of the generator can be the product of the current output mechanical power GmMPwr of the generator and the efficiency of the generator at its current speed and torque, which can also be obtained by looking up the generator efficiency table based on the current speed and torque of the generator.

[0057] S220. Based on the current first maximum mechanical power TmMPwrMaxSe of the drive motor, the current speed V1 of the drive motor, and the actual maximum driving force F1 of the drive motor, calculate the current first maximum driving force SeMTrqMax of the whole vehicle in the series drive mode according to the first calculation formula.

[0058] The first calculation formula is:

[0059] SeMTrqMax=min{TmMPwrMaxSe*k1 / V1,F1};

[0060] Wherein, k1 is a fixed parameter, and in an exemplary embodiment, k1 = 9550.

[0061] Specifically, when the current drive mode is series drive mode, the current output mechanical power of the generator is determined by obtaining the current output mechanical power GmMPwr of the generator and the efficiency of the generator at the current speed and torque. The current output electric power of the generator is determined by multiplying the current output mechanical power GmMPwr of the generator and the efficiency of the generator at the current speed and torque. The current discharge power BmsDisPwr of the power battery and the efficiency η1 of the drive motor at the current speed and torque are obtained by obtaining (current output electric power of the generator GmEPwr + current discharge power of the power battery BmsDisPwr) * efficiency η1 of the drive motor at the current speed and torque. Finally, the current output electric power of the drive motor TmMPwrMaxSe * k1 / current speed V1 of the drive motor is divided by the smaller of the actual maximum driving force F1 of the drive motor to obtain the current first maximum driving force of the whole vehicle SeMTrqMax in series drive mode.

[0062] In this embodiment, by obtaining the current first maximum mechanical power TmMPwrMaxSe of the drive motor, the current speed V1 of the drive motor, and the actual maximum driving force F1 of the drive motor, the current first maximum driving force SeMTrqMax of the vehicle under the series drive mode is determined based on the first calculation formula according to the current first maximum mechanical power TmMPwrMaxSe of the drive motor, the current speed V1 of the drive motor, and the actual maximum driving force F1 of the drive motor. This improves the accuracy of the current first maximum driving force of the vehicle under the series drive mode, thereby making the switching of the hybrid vehicle's drive mode more precise, which is conducive to further improving the operational stability and reliability of the hybrid vehicle.

[0063] Based on the above embodiments, optionally, Figure 4 This is a flowchart illustrating a method for obtaining the current second maximum driving force according to Embodiment 2 of the present invention. Figure 4 As shown, the methods for obtaining the current second maximum driving force include:

[0064] S310: Obtain the current maximum torque of the drive motor TmTrqMaxPa and the current maximum torque of the engine EngTrqMaxPa.

[0065] Among them, the current maximum torque of the drive motor, TmTrqMaxPa, can be the maximum torque that the drive motor can output at the current speed; the current maximum torque of the engine, EngTrqMaxPa, can be the maximum torque of the engine at the current speed.

[0066] In an optional embodiment, the specific method for obtaining the current maximum torque TmTrqMaxPa of the drive motor includes: obtaining the current second maximum mechanical power TmMPwrMaxPa of the drive motor, the current speed V1 of the drive motor, and the actual maximum drive torque Trq1 of the drive motor; and calculating the current maximum torque TmTrqMaxPa of the drive motor based on the current second maximum mechanical power TmMPwrMaxPa, the current speed V1 of the drive motor, and the actual maximum drive torque Trq1 of the drive motor, according to a third calculation formula; wherein the third calculation formula includes:

[0067] TmTrqMaxPa=min{TmMPwrMaxPa*k1 / V1,Trq1}.

[0068] Wherein, k1 is a fixed parameter, and in an exemplary embodiment, k1 = 9550.

[0069] The current second maximum mechanical power of the drive motor, TmMPwrMaxPa, can be the current available maximum mechanical power of the drive motor; the actual maximum drive torque of the drive motor, Trq1, can be the maximum drive torque reported by the drive motor at the current speed.

[0070] In an optional embodiment, the specific method for obtaining the current second maximum mechanical power TmMPwrMaxPa of the drive motor includes: obtaining the current discharge power BmsDisPwr of the power battery and the efficiency η1 of the drive motor at the current speed and torque; and determining the product of the current available discharge power BmsDisPwr of the power battery and the efficiency η1 of the drive motor at the current speed and torque as the current second maximum mechanical power TmMPwrMaxPa of the drive motor.

[0071] S320. The sum of the current maximum torque TmTrqMaxPa of the drive motor and the current maximum torque EngTrqMaxPa of the engine is determined as the current second maximum driving force of the vehicle PaMTrqMax.

[0072] Specifically, when the current driving mode is parallel drive mode, the current discharge power BmsDisPwr of the power battery and the efficiency η1 of the drive motor are obtained. The product of the current discharge power BmsDisPwr of the power battery and the efficiency η1 of the drive motor at the current speed and torque is determined as the current second maximum mechanical power TmMPwrMaxPa of the drive motor. The current second maximum mechanical power TmMPwrMaxPa of the drive motor, the current speed V1 of the drive motor and the actual maximum driving torque Trq1 of the drive motor are obtained. The maximum driving torque that the drive motor can currently deliver in parallel drive mode is obtained by calculating the current second maximum mechanical power TmMPwrMaxPa*k1 / current speed V1 of the drive motor. The minimum value of the current maximum driving torque that the drive motor can deliver in parallel drive mode and the actual maximum driving torque Trq1 of the drive motor is taken to determine the current maximum torque TmTrqMaxPa of the drive motor. Finally, the sum of the current maximum torque TmTrqMaxPa of the drive motor and the current maximum torque EngTrqMaxPa of the engine is determined as the current second maximum driving force PaMTrqMax of the vehicle.

[0073] In this embodiment, by obtaining the current maximum torque TmTrqMaxPa of the drive motor and the current maximum torque EngTrqMaxPa of the engine, and then determining the current second maximum driving force PaMTrqMax of the vehicle in parallel drive mode based on the sum of the current maximum torque TmTrqMaxPa of the drive motor and the current maximum torque EngTrqMaxPa of the engine, the accuracy of the current second maximum driving force of the vehicle in parallel drive mode is improved, thereby making the switching of hybrid vehicle drive mode more precise and improving the driving stability of hybrid vehicle.

[0074] Based on the above embodiments, optionally, Figure 5 This is a flowchart illustrating a method for obtaining the future maximum driving force of a vehicle in a series drive mode, as provided in Embodiment 2 of the present invention. Figure 5 As shown, the methods for obtaining the future maximum driving force of the vehicle in series drive mode include:

[0075] S410: Obtain the future maximum mechanical power TmMPwrSeMaxF and the future speed V2 of the drive motor in series drive mode.

[0076] The specific method for obtaining the future rotational speed V2 of the drive motor can be as follows: the rotational acceleration is calculated by using the current rotational speed V1 of the drive motor through a differential method. For example, the rotational acceleration can be determined by the difference between the current rotational speed of the drive motor and the rotational speed of the drive motor obtained in the previous cycle. Then, the increase in rotational speed of the drive motor after the first preset time t is determined by multiplying the rotational acceleration by the first preset time t. Finally, the sum of the increase in rotational speed of the drive motor and the current rotational speed of the drive motor is determined as the future rotational speed V2 of the drive motor.

[0077] In this context, the future maximum mechanical power TmMPwrSeMaxF of the drive motor in series drive mode can be the maximum allowable mechanical power of the drive motor in series drive mode. In an optional embodiment, the specific method for obtaining the future maximum mechanical power TmMPwrSeMaxF of the drive motor in series drive mode is as follows: obtain the theoretical maximum mechanical power TmMPwrSeMaxF1 of the drive motor in series drive mode and the actual maximum drive power TmMPwrMaxF of the drive motor; determine the smaller of the theoretical maximum mechanical power TmMPwrSeMaxF1 and the actual maximum drive power TmMPwrMaxF of the drive motor in series drive mode as the future maximum mechanical power TmMPwrSeMaxF of the drive motor in series drive mode.

[0078] The specific method for obtaining the theoretical maximum mechanical power TmMPwrSeMaxF1 of the drive motor in the series drive mode can be as follows: obtain the future maximum electrical power GmEPwrSeF of the generator, the future maximum discharge power BmsEPwrF of the power battery, and the future efficiency η2 of the drive motor; based on the future maximum electrical power GmEPwrSeF of the generator, the future maximum discharge power BmsEPwrF of the power battery, and the future efficiency η2 of the drive motor, calculate the future theoretical maximum mechanical power TmMPwrSeMaxF1 of the drive motor using the fifth calculation formula; wherein, the fifth calculation formula includes: TmMPwrSeMaxF1=(GmEPwrSeF+BmsEPwrF)*η2.

[0079] The future maximum continuous power output of the generator can be obtained by obtaining the future maximum speed V3, the future maximum torque Trq2, and the efficiency η3 at the future maximum speed. Based on the future maximum speed V3, the future maximum torque Trq2, and the efficiency η3 at the future maximum speed, the future maximum electrical power GmEPwrSeF of the generator is calculated using the sixth calculation formula, where the sixth calculation formula is:

[0080] GmEPwrSeF=(V3*Trq2 / 9550)*eta3.

[0081] To obtain the future maximum electrical power BmsEPwrF of the power battery, one can obtain the allowable discharge capacity Q and the actual maximum allowable discharge power P of the power battery. Based on the allowable discharge capacity Q and the actual maximum allowable discharge power P, the future maximum electrical power BmsEPwrF of the power battery is calculated using the ninth calculation formula. The ninth calculation formula is as follows:

[0082] BmsEPwrF = min{Q / t, P}; where t is the first preset time.

[0083] Among them, the future maximum speed of the generator V3 can be the smaller of the engine maximum speed * EngiGm and the generator maximum speed, and the future maximum generating torque of the generator Trq2 can be the smaller of the engine maximum torque / EngiGm and the generator maximum generating torque, where EngiGm is the speed ratio parameter between the engine and the generator.

[0084] Understandably, since calculating the maximum allowable mechanical power TmMPwrSeMaxF of the drive motor in the future requires knowing the future efficiency, and calculating the future efficiency depends on knowing the maximum mechanical power TmMPwrSeMaxF in the future, it faces the problem of algebraic loops. Therefore, in order to simplify the calculation process and reduce the computational requirements of hybrid vehicles, in an optional embodiment, obtaining the future efficiency η2 of the drive motor may include: based on the future maximum mechanical power TmMPwrMaxF of the drive motor in the previous calculation cycle after the first preset time and the future speed V2 of the drive motor in the previous calculation cycle after the first preset time, calculating the future torque Trq3 of the drive motor in the previous calculation cycle after the first preset time based on the tenth calculation formula; wherein, the tenth calculation formula is: Trq3=TmMPwrMaxF*k1 / V2; where k1 is a fixed parameter; and then, based on the future speed V2 of the drive motor in the previous calculation cycle after the first preset time and the future torque Trq3 of the drive motor in the previous calculation cycle after the first preset time, obtaining the future efficiency η2 of the drive motor.

[0085] S420. Based on the future maximum mechanical power TmMPwrSeMaxF of the drive motor and the future speed V2 of the drive motor in the series drive mode, calculate the future maximum driving force SeMTrqMaxF of the whole vehicle in the series drive mode according to the fourth calculation formula.

[0086] The fourth calculation formula includes: SeMTrqMaxF=TmMPwrSeMaxF*k1 / V2;

[0087] Where k1 is a fixed parameter, for example, k1 can be 9550.

[0088] In this embodiment, by using the future maximum mechanical power TmMPwrSeMaxF and the future speed V2 of the drive motor in the series drive mode, the future maximum driving force SeMTrqMaxF of the vehicle in the series drive mode is determined based on the fourth calculation formula. This improves the accuracy of the future maximum driving force of the vehicle in the series drive mode, thereby making the switching of the hybrid vehicle's drive mode more precise and improving the driving stability of the hybrid vehicle.

[0089] Based on the above embodiments, optionally, Figure 6 This is a flowchart illustrating a method for obtaining the future maximum driving force of a vehicle in parallel drive mode, as provided in Embodiment 2 of the present invention. Figure 6 As shown, methods for obtaining the future maximum driving force of the vehicle in parallel drive mode include:

[0090] S510: Obtain the future maximum driving force of the engine EngTrqMaxPaF in parallel drive mode and the future maximum driving force of the drive motor TmTrqMaxPaF in parallel drive mode.

[0091] In parallel drive mode, the future maximum driving force of the engine, EngTrqMaxPaF, can be determined by multiplying the engine's future maximum speed, V3, by the engine's external characteristic table. The future maximum driving force of the drive motor, EngTrqMaxPaF, in parallel drive mode can be the maximum driving force that the drive motor can provide in the future under parallel drive mode. In an optional embodiment, obtaining the future maximum driving force of the engine, EngTrqMaxPaF, in drive mode includes: obtaining the future maximum mechanical power, TmMPwrPaMaxF, and the future speed, V2, of the drive motor in parallel drive mode; and calculating the future maximum driving force, TmTrqMaxPaF, of the drive motor in parallel drive mode based on the seventh calculation formula, according to the future maximum mechanical power, TmMPwrPaMaxF, and the future speed, V2. The seventh calculation formula is: TmTrqMaxPaF = TmMPwrPaMaxF * k1 / V2; where k1 is a fixed parameter.

[0092] The process of obtaining the future maximum mechanical power TmMPwrPaMaxF of the drive motor in parallel drive mode includes: obtaining the future maximum discharge power BmsEPwrF of the power battery and the future efficiency η2 of the drive motor; and calculating the future maximum mechanical power TmMPwrPaMaxF of the drive motor in parallel drive mode based on the eighth calculation formula, according to the future maximum discharge power BmsEPwrF of the power battery, the future efficiency η2 of the drive motor, and the future maximum drive power TmMPwrPaMaxF2 of the drive motor at the future speed V2. The eighth calculation formula is: TmMPwrPaMaxF=min{BmsEPwrF*η2,TmMPwrPaMaxF2}.

[0093] The maximum driving power TmMPwrPaMaxF2 of the drive motor at the future speed can be obtained by multiplying the future speed of the drive motor V2 by the future torque of the drive motor Trq3 / k1.

[0094] The future maximum driving force TmTrqMaxPaF of the drive motor in parallel drive mode is obtained by using the future maximum mechanical power TmMPwrPaMaxF*9550 / the future speed V2 of the drive motor.

[0095] S520: The sum of the engine's future maximum driving force EngTrqMaxPaF in parallel drive mode and the drive motor's future maximum driving force TmTrqMaxPaF in parallel drive mode is determined as the vehicle's future maximum driving force PaMTrqMaxF in parallel drive mode.

[0096] In this embodiment, by obtaining the future maximum driving force of the engine EngTrqMaxPaF and the future maximum driving force of the drive motor TmTrqMaxPaF in parallel drive mode, and then determining the sum of the future maximum driving force of the engine EngTrqMaxPaF and the future maximum driving force of the drive motor TmTrqMaxPaF in parallel drive mode as the future maximum driving force of the whole vehicle PaMTrqMaxF in parallel drive mode, the accuracy of the future maximum driving force of the whole vehicle in parallel mode is improved, thereby making the switching of the hybrid vehicle drive mode more precise and conducive to improving the driving stability of the hybrid vehicle.

[0097] Example 3

[0098] Figure 7This is a structural block diagram of a series-parallel drive mode switching device for a hybrid electric vehicle provided in Embodiment 3 of the present invention. This switching device can be implemented in hardware and / or software and can be integrated into a hybrid electric vehicle. The device is used to control the switching of drive modes in the hybrid electric vehicle, which includes at least an engine, a generator, a power battery, and a drive motor. Figure 7 As shown, the switching device includes:

[0099] The acquisition module 710 is used to acquire the current driving mode of the hybrid vehicle and the driving force information in the current driving mode; wherein, when the current driving mode is the series driving mode, the driving force information includes the current first maximum driving force of the vehicle, the current maximum driving force of the vehicle in the parallel driving mode, the future maximum driving force of the vehicle in the series driving mode, the future maximum driving force of the vehicle in the parallel driving mode, and the current required driving force of the vehicle; when the current driving mode is the parallel driving mode, the driving force information includes the current second maximum driving force of the vehicle, the future maximum driving force of the vehicle in the series driving mode, the future maximum driving force of the vehicle in the parallel driving mode, and the current required driving force of the vehicle.

[0100] The judgment module 720 is used to determine whether the driving force information meets the switching conditions corresponding to the current driving mode. When the current driving mode is the series driving mode, the switching conditions are: the difference between the current first maximum driving force of the vehicle and the current maximum driving force of the vehicle in the parallel driving mode is less than a first preset difference; the difference between the future maximum driving force of the vehicle in the parallel driving mode and the future maximum driving force of the vehicle in the series driving mode is greater than a second preset difference; and the difference between the current first maximum driving force of the vehicle and the current required driving force of the vehicle is less than a third preset difference. When the current driving mode is the parallel driving mode, the switching conditions are: the difference between the future maximum driving force of the vehicle in the series driving mode and the future maximum driving force of the vehicle in the parallel driving mode is greater than a fourth preset difference; and the difference between the current second maximum driving force of the vehicle and the current required driving force of the vehicle is greater than a fifth preset difference.

[0101] The drive mode switching module 730 is used to control the hybrid vehicle to switch from the current drive mode to another drive mode that is different from the current drive mode.

[0102] The hybrid electric vehicle series-parallel drive mode switching device provided in this embodiment of the invention can execute the hybrid electric vehicle series-parallel drive mode switching method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. The similarities can be referred to the above description.

[0103] Example 4

[0104] This invention also provides a computer-readable storage medium storing computer instructions that cause a processor to execute the switching method provided in any of the above embodiments.

[0105] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0106] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for switching the series-parallel drive mode of a hybrid electric vehicle, used to control the hybrid electric vehicle to switch drive modes, wherein the hybrid electric vehicle includes at least an engine, a generator, a power battery, and a drive motor, characterized in that, The hybrid electric vehicle's driving modes include a series driving mode and a parallel driving mode; the method for switching between the series and parallel driving modes of the hybrid electric vehicle includes: The system obtains the current driving mode of the hybrid vehicle and the driving force information under the current driving mode; wherein, when the current driving mode is the series driving mode, the driving force information includes the current first maximum vehicle driving force, the current maximum vehicle driving force under the parallel driving mode, the future maximum vehicle driving force under the series driving mode, the future maximum vehicle driving force under the parallel driving mode, and the current required vehicle driving force; when the current driving mode is the parallel driving mode, the driving force information includes the current second maximum vehicle driving force, the future maximum vehicle driving force under the series driving mode, the future maximum vehicle driving force under the parallel driving mode, and the current required vehicle driving force; the current first maximum vehicle driving force is the current maximum vehicle driving force when the hybrid vehicle is in the series driving mode, and the first maximum vehicle driving force is the maximum vehicle driving force when the hybrid vehicle is in the series driving mode. The maximum driving force is determined by the operating state of the drive motor; the current second maximum driving force of the vehicle is the current maximum driving force of the hybrid vehicle when it is in the parallel drive mode, and the second maximum driving force of the vehicle is jointly determined by the operating state of the engine and the operating state of the drive motor; the future maximum driving force of the vehicle in the series drive mode is the maximum driving force of the vehicle after a first preset time in the series drive mode; the future maximum driving force of the vehicle in the parallel drive mode can be the maximum driving force of the vehicle after a first preset time in the parallel drive mode; the future maximum driving force of the vehicle in the series drive mode and the future maximum driving force of the vehicle in the parallel drive mode are determined by the current vehicle speed of the hybrid vehicle, and the operating state and capability of the electric motor, the generator, the power battery and / or the drive motor; Determine whether the driving force information meets the switching conditions corresponding to the current driving mode; when the current driving mode is the series driving mode, the switching conditions are: the difference between the current first maximum driving force of the vehicle and the current maximum driving force of the vehicle in the parallel driving mode is less than a first preset difference; the difference between the future maximum driving force of the vehicle in the parallel driving mode and the future maximum driving force of the vehicle in the series driving mode is greater than a second preset difference; and the difference between the current first maximum driving force of the vehicle and the current required vehicle driving force is less than a third preset difference; when the current driving mode is the parallel driving mode, the switching conditions are: the difference between the future maximum driving force of the vehicle in the series driving mode and the future maximum driving force of the vehicle in the parallel driving mode is greater than a fourth preset difference; and the difference between the current second maximum driving force of the vehicle and the current required vehicle driving force is greater than a fifth preset difference. If so, the hybrid vehicle is controlled to switch from the current driving mode to another driving mode different from the current driving mode.

2. The switching method according to claim 1, characterized in that, When the current driving mode is the series driving mode, obtaining the current first maximum driving force of the vehicle includes: Obtain the current first maximum mechanical power TmMPwrMaxSe of the drive motor, the current speed V1 of the drive motor, and the actual maximum driving force F1 of the drive motor; Based on the current first maximum mechanical power TmMPwrMaxSe of the drive motor, the current speed V1 of the drive motor, and the actual maximum driving force F1 of the drive motor, the current first maximum driving force SeMTrqMax of the entire vehicle is calculated according to the first calculation formula; wherein, the first calculation formula is: ； in, These are fixed parameters.

3. The switching method according to claim 2, characterized in that, Obtaining the current first maximum mechanical power TmMPwrMaxSe of the drive motor includes: Obtain the current output power GmEPwr of the generator, the current discharge power BmsDisPwr of the power battery, and the efficiency η1 of the drive motor at the current speed and torque. Based on the current output power GmEPwr of the generator, the current discharge power BmsDisPwr of the power battery, and the efficiency η1 of the drive motor at the current speed and torque, the current first maximum mechanical power TmMPwrMaxSe of the drive motor is calculated using the second calculation formula; wherein, the second calculation formula is: TmMPwrMaxSe=(GmEPwr+BmsDisPwr)*η1.

4. The switching method according to claim 1, characterized in that, When the current driving mode is the parallel driving mode, obtaining the current second maximum driving force of the vehicle includes: Obtain the current maximum torque TmTrqMaxPa of the drive motor and the current maximum torque EngTrqMaxPa of the engine; The sum of the current maximum torque TmTrqMaxPa of the drive motor and the current maximum torque EngTrqMaxPa of the engine is determined as the current second maximum driving force of the vehicle.

5. The switching method according to claim 4, characterized in that, Obtaining the current maximum torque TmTrqMaxPa of the drive motor includes: Obtain the current second maximum mechanical power TmMPwrMaxPa of the drive motor, the current speed V1 of the drive motor, and the actual maximum drive torque of the drive motor. ; Based on the current second maximum mechanical power TmMPwrMaxPa of the drive motor, the current speed V1 of the drive motor, and the actual maximum drive torque of the drive motor. Based on the third calculation formula, the current maximum torque TmTrqMaxPa of the drive motor is calculated; wherein, the third calculation formula includes: ， Where k1 is a fixed parameter.

6. The switching method according to claim 5, characterized in that, Obtaining the current second maximum mechanical power TmMPwrMaxPa of the drive motor includes: Obtain the current discharge power BmsDisPwr of the power battery and the efficiency of the drive motor at the current speed and torque. ; The efficiency of the power battery at its current discharge power BmsDisPwr and the drive motor at its current speed and torque. The product of these two values ​​is determined as the current second maximum mechanical power TmMPwrMaxPa of the drive motor.

7. The switching method according to claim 1, characterized in that, Obtaining the future maximum driving force of the vehicle under the series drive mode includes: Obtain the future maximum mechanical power TmMPwrSeMaxF and the future speed V2 of the drive motor in the series drive mode; Based on the future maximum mechanical power TmMPwrSeMaxF of the drive motor and the future speed V2 of the drive motor in the series drive mode, the future maximum driving force SeMTrqMaxF of the entire vehicle in the series drive mode is calculated using the fourth calculation formula; wherein, the fourth calculation formula includes: SeMTrqMaxF=TmMPwrSeMaxF* / V2; Where k1 is a fixed parameter.

8. The switching method according to claim 7, characterized in that, Obtaining the future maximum mechanical power TmMPwrSeMaxF of the drive motor includes: Obtain the theoretical maximum mechanical power TmMPwrSeMaxF1 of the drive motor in the series drive mode and the actual maximum drive power TmMPwrMaxF; The smaller of the theoretical maximum mechanical power TmMPwrSeMaxF1 of the drive motor in the series drive mode and the actual maximum drive power TmMPwrMaxF of the drive motor is determined as the future maximum mechanical power TmMPwrSeMaxF of the drive motor in the series drive mode.

9. The switching method according to claim 8, characterized in that, Obtaining the theoretical maximum mechanical power TmMPwrSeMaxF1 of the drive motor in the series drive mode includes: Obtain the future maximum electrical power of the generator GmEPwrSeF, the future maximum discharge power of the power battery BmsEPwrF, and the future efficiency of the drive motor. ; Based on the future maximum electrical power of the generator GmEPwrSeF, the future maximum discharge power of the power battery BmsEPwrF, and the future efficiency of the drive motor Based on the fifth calculation formula, the future maximum mechanical power TmMPwrSeMaxF1 of the drive motor is calculated; wherein, the fifth calculation formula includes: TmMPwrSeMaxF1=(GmEPwrSeF+BmsEPwrF)* 。 10. The switching method according to claim 9, characterized in that, Obtaining the future maximum electrical power GmEPwrSeF of the generator includes: Obtain the generator's future maximum speed V3 and the generator's future maximum generating torque. And the efficiency η3 of the generator at the highest future speed; Based on the generator's future maximum speed V3 and the generator's future maximum generating torque Based on the efficiency η3 of the generator at its future highest speed, and using the sixth calculation formula, calculate the generator's future sustained maximum electrical power GmEPwrSeF, where the sixth calculation formula is: GmEPwrSeF= (V3* / k1)*η3; Where k1 is a fixed parameter.

11. The switching method according to claim 1, characterized in that, Obtaining the maximum driving force of the vehicle in the future under the parallel drive mode includes: Obtain the future maximum driving force of the engine EngTrqMaxPaF and the future maximum driving force of the drive motor in the parallel drive mode; The sum of the engine's future maximum driving force EngTrqMaxPaF and the drive motor's future maximum driving force TmTrqMaxPaF in the parallel drive mode is determined as the vehicle's future maximum driving force PaMTrqMaxF in the parallel drive mode.

12. The switching method according to claim 11, characterized in that, Obtaining the future maximum driving force TmTrqMaxPaF of the drive motor in the parallel drive mode includes: Obtain the future maximum mechanical power TmMPwrPaMaxF and the future speed V2 of the drive motor in the parallel drive mode; Based on the future maximum mechanical power TmMPwrPaMaxF of the drive motor and the future speed V2 of the drive motor in the parallel drive mode, the future maximum driving force TmTrqMaxPaF of the drive motor in the parallel drive mode is calculated based on the seventh calculation formula; wherein, the seventh calculation formula is: TmTrqMaxPaF= TmMPwrPaMaxF* k1 / V2. Where k1 is a fixed parameter.

13. The switching method according to claim 12, characterized in that, Obtaining the future maximum mechanical power TmMPwrPaMaxF of the drive motor in the parallel drive mode includes: Obtain the future maximum discharge power BmsEPwrF of the power battery and the future efficiency of the drive motor. And the maximum driving power TmMPwrPaMaxF2 of the drive motor at the future speed V2; Based on the future maximum discharge power BmsEPwrF of the power battery and the future efficiency of the drive motor Based on the maximum driving power TmMPwrPaMaxF2 of the drive motor at the future speed V2, and the eighth calculation formula, the future maximum mechanical power TmMPwrPaMaxF of the drive motor in the parallel drive mode is calculated; wherein, the eighth calculation formula is: TmMPwrPaMaxF=min{BmsEPwrF* ,TmMPwrPaMaxF2}。 14. The switching method according to claim 9 or 13, characterized in that, Obtaining the future maximum discharge power BmsEPwrF of the power battery includes: Obtain the allowable discharge amount Q of the power battery and the actual maximum allowable discharge power P of the power battery; Based on the allowable discharge amount Q of the power battery and the actual maximum allowable discharge power P of the power battery, the future maximum electric power BmsEPwrF of the power battery is calculated according to the ninth calculation formula; where the ninth calculation formula is: BmsEPwrF=min{ Q / t, P}; where t is the first preset time.

15. The switching method according to claim 9 or 13, characterized in that, Obtain the future efficiency of the drive motor include: Based on the future maximum mechanical power TmMPwrMaxF and the future speed V2 of the drive motor mentioned in the previous calculation period, the future torque of the drive motor in the previous calculation period is calculated using the tenth calculation formula. The tenth calculation formula is: =TmMPwrMaxF*k1 / V2; where k1 is a fixed parameter; Based on the future speed V2 of the drive motor and the future torque of the drive motor as described in the previous calculation period. The future efficiency of the drive motor is obtained. .

16. A series-parallel drive mode switching device for a hybrid electric vehicle, used to control the hybrid electric vehicle to switch drive modes, the hybrid electric vehicle comprising at least an engine, a generator, a power battery, and a drive motor, characterized in that, The hybrid electric vehicle's driving modes include a series driving mode and a parallel driving mode; the hybrid electric vehicle's series-parallel driving mode switching device includes: An acquisition module is used to acquire the current driving mode of the hybrid vehicle and the driving force information under the current driving mode; wherein, when the current driving mode is the series driving mode, the driving force information includes the current first maximum driving force of the vehicle, the current maximum driving force of the vehicle under the parallel driving mode, the future maximum driving force of the vehicle under the series driving mode, the future maximum driving force of the vehicle under the parallel driving mode, and the current required vehicle driving force; when the current driving mode is the parallel driving mode, the driving force information includes the current second maximum driving force of the vehicle, the future maximum driving force of the vehicle under the series driving mode, the future maximum driving force of the vehicle under the parallel driving mode, and the current required vehicle driving force; the current first maximum driving force of the vehicle is the current maximum driving force of the hybrid vehicle when it is in the series driving mode. The first maximum driving force of the vehicle is determined by the operating state of the drive motor; the current second maximum driving force of the vehicle is the current maximum driving force of the hybrid vehicle when it is in the parallel drive mode, and the second maximum driving force of the vehicle is jointly determined by the operating state of the engine and the operating state of the drive motor; the future maximum driving force of the vehicle in the series drive mode is the maximum driving force of the vehicle after a first preset time in the series drive mode; the future maximum driving force of the vehicle in the parallel drive mode can be the maximum driving force of the vehicle after a first preset time in the parallel drive mode; the future maximum driving force of the vehicle in the series drive mode and the future maximum driving force of the vehicle in the parallel drive mode are determined by the current vehicle speed of the hybrid vehicle, and the operating state and capability of the electric motor, the generator, the power battery and / or the drive motor; The judgment module is used to determine whether the driving force information meets the switching conditions corresponding to the current driving mode; when the current driving mode is the series driving mode, the switching conditions are that the difference between the current first maximum driving force of the vehicle and the current maximum driving force of the vehicle in the parallel driving mode is less than a first preset difference, the difference between the future maximum driving force of the vehicle in the parallel driving mode and the future maximum driving force of the vehicle in the series driving mode is greater than a second preset difference, and the difference between the current first maximum driving force of the vehicle and the current required vehicle driving force is less than a third preset difference; when the current driving mode is the parallel driving mode, the switching conditions are that the difference between the future maximum driving force of the vehicle in the series driving mode and the future maximum driving force of the vehicle in the parallel driving mode is greater than a fourth preset difference, and the difference between the current second maximum driving force of the vehicle and the current required vehicle driving force is greater than a fifth preset difference. The drive mode switching module is used to control the hybrid vehicle to switch from the current drive mode to another drive mode that is different from the current drive mode.

17. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the switching method according to any one of claims 1-15.

18. A hybrid electric vehicle, characterized in that, It includes at least an engine, generator, power battery, drive motor, and control system; The control system is used to execute the hybrid electric vehicle series-parallel drive mode switching method according to any one of claims 1-15.

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