Determination Method for Driving Mode Switching Timing of Hybrid Vehicle, Driving Mode Control Method, Device, Vehicle, Medium and Equipment

Abstract

The present invention relates to a method for determining the switching timing of a driving mode of a hybrid vehicle, a driving mode control method, a device, a vehicle, a medium and a device. The control method includes: obtaining the operating parameters of the vehicle; based on the operating parameters of the vehicle, determining whether the vehicle meets the preset entry conditions for entering the parallel driving mode and whether it meets the preset switching conditions for driving mode switching; if the vehicle meets the preset switching conditions for driving mode switching, determining the target driving mode of the vehicle based on the driving mode request; and controlling the driving mode of the vehicle according to the current driving mode and the target driving mode of the vehicle. By reasonably determining the switching timing of the driving mode of the vehicle and then determining the target driving mode in combination with the driver's power demand and economic demand, the vehicle can perform a reasonable driving mode switching at a reasonable switching timing, achieving the effect of making the vehicle operate in the optimal driving mode.

Description

Technical Field

[0001] The present invention relates to the field of control of hybrid electric vehicles, and particularly to a method for determining the driving mode switching timing of a hybrid vehicle, a driving mode control method, a device, a vehicle, a medium and a device. Background Art

[0002] In recent years, due to environmental protection and energy conservation and emission reduction considerations, hybrid electric vehicles have been favored by more and more manufacturers because of their technical advantages such as long endurance and low fuel consumption.

[0003] Such as Figure 1 As shown, the existing hybrid vehicle with P13 configuration consists of an engine, a P1 generator, a P3 drive motor, a power battery, a K3 clutch and a transmission mechanism. For this configuration of hybrid vehicle, the vehicle can select a suitable driving mode in different usage scenarios. Specifically, when the power battery has sufficient power, the vehicle runs in pure electric mode; when the power battery has insufficient power, the engine can be started to generate electricity through the P1 generator, so that the vehicle runs in series mode; at medium and high speeds, the vehicle closes the K3 clutch, and the engine directly participates in vehicle driving, so that the vehicle runs in parallel mode.

[0004] During the actual driving process, the vehicle involves a process of frequent driving mode switching. For example, the vehicle switches from series mode to parallel mode and from parallel mode to series mode. When the vehicle performs these two types of driving mode switching, it is extremely important to determine the timing of driving mode switching.

[0005] In CN101445043A, a hybrid drive system is disclosed. This solution introduces setting a first predetermined current SOC0, a second predetermined power SOC1, a third predetermined power SOC2; comparing with the actual SOC; a first predetermined vehicle speed Velo1, a second predetermined vehicle speed Velo2, and comparing with the current vehicle speed Velo, and at the same time considering whether the EV button can be pressed to determine that the vehicle driving mode is in pure electric EV mode, series mode or parallel mode. The method provided in this solution simply relies on the calibration settings of the predetermined SOC and the predetermined vehicle speed to determine the driving mode of the vehicle, and does not involve the determination process of the vehicle driving mode switching timing. Summary of the Invention

[0006] The present invention provides a driving mode control method, a device, a vehicle, a medium and a device for a hybrid vehicle. By reasonably determining the driving mode switching timing of the vehicle, and then, on the basis of determining that the driving mode switching timing of the vehicle is reasonable, combined with the driver's power demand or economic demand to select a suitable driving mode to be switched, so that the vehicle can perform a reasonable driving mode switching at a reasonable switching timing, achieving the effect of making the vehicle run in the best driving mode.

[0007] The technical solution of the present invention is as follows:

[0008] The present invention provides a method for determining the driving mode switching timing of a hybrid vehicle. The hybrid vehicle at least includes: a power battery, an engine, a driving motor, a generator, and a clutch. The engine can be coupled or disconnected from the wheel end through the clutch. The driving motor is directly connected to the wheel end. The driving motor is connected to the power battery. The generator is connected to the engine. The generator is connected to the power battery and / or the driving motor. The method includes:

[0009] Obtain the operating parameters of the vehicle; the operating parameters include: the maximum driving power of the driving motor of the vehicle at the current speed, the maximum long-term discharge power of the battery, the low-voltage load power, the vehicle speed, the throttle pedal signal, the tire diameter, the total speed ratio from the engine to the wheel end, and the total speed ratio from the generator to the wheel end;

[0010] Based on the operating parameters of the vehicle, determine whether the vehicle meets the preset switching conditions for driving mode switching;

[0011] If the vehicle meets the preset switching conditions for driving mode switching, it is determined that the driving mode switching timing of the hybrid vehicle is reasonable.

[0012] Preferably, the operating parameters further include: the vehicle speed, the engine idle speed, the engine state, the clutch state, the remaining fuel amount of the engine, and the gear lever position of the gearbox. Before the step of determining whether the vehicle meets the preset switching conditions for driving mode switching, the method further includes:

[0013] Based on the vehicle speed, the engine idle speed, the engine state, the clutch state, the remaining fuel amount of the engine, the total speed ratio from the engine to the wheel end, and the gear lever position of the gearbox, determine whether the vehicle meets the preset entry conditions for entering the parallel driving mode;

[0014] If the vehicle meets the preset entry conditions for entering the parallel driving mode, then execute the step of determining whether the vehicle meets the preset switching conditions for driving mode switching based on the operating parameters of the vehicle.

[0015] Preferably, the step of determining whether the vehicle meets the preset switching conditions for driving mode switching based on the operating parameters of the vehicle includes:

[0016] Determine the driver's required power according to the vehicle speed and the throttle pedal signal;

[0017] Calculate the maximum driving power of the engine target synchronous speed according to the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter;

[0018] Calculate the maximum power generation of the generator's target synchronous speed according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0019] Determine the available driving power of the battery according to the maximum long-term discharge power of the battery and the low-voltage load power;

[0020] Determine the maximum series power at the target synchronous speed according to the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the maximum power generation of the generator at the target synchronous speed;

[0021] If the driver's required power < the maximum series power at the target synchronous speed, determine that the vehicle meets the preset switching conditions for driving mode switching.

[0022] Preferably, the steps of calculating the maximum driving power of the engine's target synchronous speed according to the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter include:

[0023] Calculate the engine synchronous speed according to the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter;

[0024] Calculate the change rate of the engine synchronous speed according to the engine synchronous speed and the engine synchronous speed calculated N preset cycles ago;

[0025] Calculate the engine's target synchronous speed according to the engine synchronous speed and the engine synchronous change rate;

[0026] Determine the maximum driving power of the engine's target synchronous speed according to the engine's target synchronous speed.

[0027] Preferably, the steps of calculating the maximum power generation of the generator's target synchronous speed according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter include:

[0028] Calculate the generator synchronous speed according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0029] Calculate the change rate of the generator synchronous speed according to the generator synchronous speed and the generator synchronous speed calculated N preset cycles ago;

[0030] Calculate the generator's target synchronous speed according to the generator synchronous speed and the generator synchronous change rate;

[0031] Determine the maximum power generation of the generator's target synchronous speed according to the generator's target synchronous speed.

[0032] Preferably, the steps of determining whether the vehicle meets the preset entry conditions for entering the parallel drive mode based on the vehicle's operating parameters include:

[0033] Convert the engine idle speed to the vehicle speed at the wheel end in combination with the overall engine-to-wheel speed ratio.

[0034] If the vehicle speed > the vehicle speed at the wheel end, the gear position of the transmission is in the forward gear, the remaining fuel quantity of the engine > the preset calibration value, the engine state is the running state, and the clutch state is the fault-free state, determine that the vehicle meets the preset entry conditions for entering the parallel drive mode.

[0035] The present invention provides a drive mode control method for a hybrid vehicle, the hybrid vehicle at least including: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be coupled or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery. The generator is connected to the engine. The generator is connected to the power battery and / or the drive motor. The method includes:

[0036] Obtain the operating parameters of the vehicle;

[0037] Based on the operating parameters of the vehicle, determine whether the vehicle meets the preset switching conditions for drive mode switching;

[0038] If the vehicle meets the preset switching conditions for drive mode switching, determine the target drive mode of the vehicle based on the drive mode request;

[0039] Perform drive mode control of the vehicle according to the current drive mode and the target drive mode of the vehicle.

[0040] Preferably, before the step of determining whether the vehicle meets the preset switching conditions for drive mode switching, the method further includes:

[0041] Based on the operating parameters of the vehicle, determine whether the vehicle meets the preset entry conditions for entering the parallel drive mode;

[0042] If the vehicle meets the preset entry conditions for entering the parallel drive mode, then execute the step of determining whether the vehicle meets the preset switching conditions for drive mode switching based on the operating parameters of the vehicle;

[0043] If the vehicle does not meet the preset entry conditions for entering the parallel drive mode, determine the target drive mode of the vehicle as the series drive mode, and then execute the step of performing drive mode control of the vehicle according to the current drive mode and the target drive mode of the vehicle.

[0044] Preferably, the operating parameters of the vehicle include: vehicle speed, engine idle speed, engine state, clutch state, remaining fuel quantity of the engine, overall engine-to-wheel speed ratio, and gear position of the transmission. The step of determining whether the vehicle meets the preset entry conditions for entering the parallel drive mode based on the operating parameters of the vehicle includes:

[0045] Convert the engine idle speed to the vehicle speed at the wheel end in combination with the overall engine-to-wheel speed ratio.

[0046] If the vehicle speed > the vehicle speed at the wheel end, the gear lever position of the transmission is in the forward gear, the remaining fuel quantity of the engine > the preset calibration value, the engine state is the running state, and the clutch state is the fault-free state, it is determined that the vehicle meets the preset entry conditions for entering the parallel drive mode.

[0047] Preferably, the operating parameters of the vehicle include: the maximum driving power of the drive motor at the current speed, the maximum long-term discharge power of the battery, the low-voltage load power, the vehicle speed, the accelerator pedal signal, the tire diameter, the overall engine-to-wheel speed ratio, and the overall generator-to-wheel speed ratio. Based on the operating parameters of the vehicle, the steps for determining whether the vehicle meets the preset switching conditions for drive mode switching include:

[0048] Determine the driver's required power according to the vehicle speed and the accelerator pedal signal;

[0049] Calculate the maximum driving power at the engine target synchronous speed according to the vehicle speed, the overall engine-to-wheel speed ratio, and the tire diameter;

[0050] Calculate the maximum power generation at the generator target synchronous speed according to the vehicle speed, the overall generator-to-wheel speed ratio, and the tire diameter;

[0051] Determine the available driving power of the battery according to the maximum long-term discharge power of the battery and the low-voltage load power;

[0052] Determine the maximum series-connected power at the target synchronous speed according to the maximum driving power of the drive motor at the current speed, the maximum driving power at the engine target synchronous speed, and the maximum power generation at the generator target synchronous speed;

[0053] If the driver's required power < the maximum series-connected power at the target synchronous speed, it is determined that the vehicle meets the preset switching conditions for drive mode switching.

[0054] Preferably, the steps for calculating the maximum driving power at the engine target synchronous speed according to the vehicle speed, the overall engine-to-wheel speed ratio, and the tire diameter include:

[0055] Calculate the engine synchronous speed according to the vehicle speed, the overall engine-to-wheel speed ratio, and the tire diameter;

[0056] Calculate the engine synchronous speed change rate according to the engine synchronous speed and the engine synchronous speed calculated N preset cycles ago;

[0057] Calculate the engine target synchronous speed according to the engine synchronous speed and the engine synchronous change rate;

[0058] Determine the maximum driving power of the engine target synchronous speed according to the engine target synchronous speed.

[0059] Preferably, the steps of calculating the maximum power generation of the generator target synchronous speed according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter include:

[0060] Calculate the generator synchronous speed according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0061] Calculate the generator synchronous speed change rate according to the generator synchronous speed and the generator synchronous speed calculated N preset cycles ago;

[0062] Calculate the generator target synchronous speed according to the generator synchronous speed and the generator synchronous change rate;

[0063] Determine the maximum power generation of the generator target synchronous speed according to the generator target synchronous speed.

[0064] Preferably, the drive mode request is output by the drive mode request function module of the vehicle; or

[0065] The drive mode request is generated based on the operating parameters of the vehicle.

[0066] Preferably, the drive mode request includes a drive mode request based on the dynamic performance angle and a drive mode request based on the economic performance angle. The drive mode request based on the dynamic performance angle includes a parallel drive mode request based on the dynamic performance angle and a series drive mode request based on the dynamic performance. The drive mode request based on the economic performance angle includes a parallel drive mode request based on the economic performance angle and a series drive mode request based on the economic performance; where

[0067] If the first preset value < driver's required power < maximum power of the target synchronous speed in series, it is determined that there is a drive mode request based on the dynamic performance angle;

[0068] On the basis of the existence of a drive mode request based on the dynamic performance angle, if the value of the maximum power in the parallel mode minus the maximum power in the series mode > the second preset value, it is determined that a parallel drive mode request based on the dynamic performance angle is received; otherwise, it is determined that a series drive mode request based on the dynamic performance angle is received;

[0069] If the driver's required power ≤ the first preset value, it is determined that there is a drive mode request based on the economic performance angle;

[0070] On the basis of the existence of a drive mode request based on the economic performance angle, if the value of the equivalent fuel consumption power in the series mode minus the equivalent fuel consumption power in the parallel mode > the third preset value, it is determined that a parallel drive mode request based on the economic performance angle is received; otherwise, it is determined that a series drive mode request based on the economic performance angle is received;

[0071] The target synchronous speed series maximum power is determined according to the maximum driving power of the drive motor at the current speed, the vehicle speed, the total speed ratio from the engine to the wheel end, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0072] The series mode maximum power is determined according to the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine external characteristic, the maximum power generation power of the generator external characteristic, and the available driving power of the battery;

[0073] The parallel mode maximum power is determined according to the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the available driving power of the battery;

[0074] The equivalent fuel consumption power in the parallel mode is determined according to the engine target speed, engine target torque, engine target loss power, drive motor target speed, drive motor target torque, drive motor loss power, battery target charge and discharge loss power, actual SOC, and target SOC determined in the parallel mode;

[0075] The equivalent fuel consumption power in the series mode is determined according to the engine target speed, engine target torque, generator target speed, generator target torque, drive motor target speed, drive motor target torque, drive motor loss power, generator loss power, actual SOC, and target SOC determined in the series mode;

[0076] The first preset value is related to the current vehicle speed and the actual SOC of the battery.

[0077] Preferably, the step of determining the target driving mode of the vehicle based on the driving mode request includes:

[0078] If there is a parallel driving mode request based on the dynamic performance angle or a parallel driving mode request based on the economic performance angle, determine that the target driving mode of the vehicle is the parallel driving mode;

[0079] If there is a series driving mode request based on the dynamic performance angle or a series driving mode request based on the economic performance angle, determine that the target driving mode of the vehicle is the series driving mode.

[0080] Preferably, the method further includes:

[0081] If the vehicle does not meet the preset switching conditions for driving mode switching, determine that the target driving mode of the vehicle remains the current driving mode unchanged, and then execute the step of driving mode control based on the current driving mode and the target driving mode of the vehicle.

[0082] The present invention also provides a determination device for the driving mode switching timing of a hybrid vehicle. The hybrid vehicle at least includes: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be coupled or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery. The generator is connected to the engine. The generator is connected to the power battery and / or the drive motor. The device includes:

[0083] An acquisition module for acquiring the operating parameters of the vehicle. The operating parameters include: the maximum driving power of the drive motor of the vehicle at the current speed, the long-term maximum discharge power of the battery, the low-voltage load power, the vehicle speed, the accelerator pedal signal, the tire diameter, the total speed ratio from the engine to the wheel end, and the total speed ratio from the generator to the wheel end;

[0084] A driving mode switching condition judgment module for judging whether the vehicle meets the preset switching conditions for driving mode switching based on the operating parameters of the vehicle;

[0085] A driving mode switching timing judgment module for determining that the driving mode switching timing of the hybrid vehicle is reasonable if the vehicle meets the preset switching conditions for driving mode switching.

[0086] Preferably, the operating parameters further include: the vehicle speed, the engine idle speed, the engine state, the clutch state, the remaining fuel amount of the engine, and the position of the transmission gear lever. The device further includes:

[0087] A parallel driving mode entry condition judgment module for judging whether the vehicle meets the preset entry conditions for entering the parallel driving mode based on the vehicle speed, the engine idle speed, the engine state, the clutch state, the remaining fuel amount of the engine, the total speed ratio from the engine to the wheel end, and the position of the transmission gear lever;

[0088] If the vehicle meets the preset entry conditions for entering the parallel driving mode, then execute the step of judging whether the vehicle meets the preset switching conditions for driving mode switching based on the operating parameters of the vehicle through the driving mode switching timing judgment module.

[0089] The present invention also provides a driving mode control device for a hybrid vehicle. The hybrid vehicle at least includes: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be coupled or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery. The generator is connected to the engine. The generator is connected to the power battery and / or the drive motor. The device includes:

[0090] An acquisition module for acquiring the operating parameters of the vehicle;

[0091] A preset switching condition judgment module, configured to judge whether the vehicle meets the preset switching conditions for driving mode switching based on the operating parameters of the vehicle;

[0092] A first target driving mode determination module, configured to determine the target driving mode of the vehicle based on a driving mode request if the vehicle meets the preset switching conditions for driving mode switching;

[0093] A first driving mode control module, configured to control the driving mode of the vehicle according to the current driving mode and the target driving mode of the vehicle.

[0094] Preferably, the device further includes: a preset entry condition judgment module, configured to judge whether the vehicle meets the preset entry conditions for entering the parallel driving mode based on the operating parameters of the vehicle;

[0095] A second target driving mode determination module, configured to determine the target driving mode of the vehicle as the series driving mode if the vehicle does not meet the preset entry conditions for entering the parallel driving mode.

[0096] Preferably, the operating parameters of the vehicle include: vehicle speed, engine idle speed, engine state, clutch state, remaining fuel quantity of the engine, total speed ratio from the engine to the wheel end, and gear lever position of the transmission. The preset entry condition judgment module includes:

[0097] A wheel-end vehicle speed conversion unit, configured to convert the engine idle speed to the wheel-end vehicle speed in combination with the total speed ratio from the engine to the wheel end;

[0098] A preset entry condition judgment unit, configured to determine that the vehicle meets the preset entry conditions for entering the parallel driving mode if the vehicle speed > wheel-end vehicle speed, the gear lever position of the transmission is in the forward gear, the remaining fuel quantity of the engine > preset calibration value, the engine state is the running state, and the clutch state is the fault-free state.

[0099] Preferably, the operating parameters of the vehicle include: maximum driving power of the drive motor at the current speed, maximum long-time discharge power of the battery, low-voltage load power, vehicle speed, accelerator pedal signal, tire diameter, total speed ratio from the engine to the wheel end, and total speed ratio from the generator to the wheel end. The preset switching condition judgment module includes:

[0100] A driver demand power determination unit, configured to determine the driver demand power according to the vehicle speed and the accelerator pedal signal;

[0101] An engine target synchronous speed maximum driving power determination unit, configured to calculate the maximum driving power of the engine at the target synchronous speed according to the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter;

[0102] A generator target synchronous speed maximum power generation power determination unit, which is used to calculate the generator target synchronous speed maximum power generation power according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0103] A battery available driving power determination unit, which is used to determine the battery available driving power according to the battery long-term maximum discharge power and the low-voltage load power;

[0104] A target synchronous speed series maximum power determination unit, which is used to determine the target synchronous speed series maximum power according to the maximum driving power of the drive motor at the current speed, the engine target synchronous speed maximum driving power, and the generator target synchronous speed maximum power generation power;

[0105] A preset switching condition judgment unit, which is used to determine that the vehicle meets the preset switching conditions for driving mode switching if the driver's required power < the target synchronous speed series maximum power.

[0106] Preferably, the driving mode request includes a driving mode request based on the dynamic performance angle and a driving mode request based on the economic performance angle. The driving mode request based on the dynamic performance angle includes a parallel driving mode request based on the dynamic performance angle and a series driving mode request based on the dynamic performance. The driving mode request based on the economic performance angle includes a parallel driving mode request based on the economic performance angle and a series driving mode request based on the economic performance; where

[0107] If the first preset value < the driver's required power < the target synchronous speed series maximum power, it is determined that there is a driving mode request based on the dynamic performance angle;

[0108] On the basis of there being a driving mode request based on the dynamic performance angle, if the value of the maximum power of the parallel mode minus the maximum power of the series mode > the second preset value, it is determined that a parallel driving mode request based on the dynamic performance angle is received; otherwise, it is determined that a series driving mode request based on the dynamic performance angle is received;

[0109] If the driver's required power ≤ the first preset value, it is determined that there is a driving mode request based on the economic performance angle;

[0110] On the basis of there being a driving mode request based on the economic performance angle, if the equivalent fuel consumption power of the series mode minus the equivalent fuel consumption power of the parallel mode > the third preset value, it is determined that a parallel driving mode request based on the economic performance angle is received; otherwise, it is determined that a series driving mode request based on the economic performance angle is received;

[0111] The target synchronous speed series maximum power is determined according to the maximum driving power of the drive motor at the current speed, the vehicle speed, the total speed ratio from the engine to the wheel end, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0112] The maximum power in series mode is determined based on the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine's external characteristic, the maximum power generation power of the generator's external characteristic, and the available driving power of the battery;

[0113] The maximum power in parallel mode is determined based on the maximum driving power of the drive motor at the current speed, the maximum driving power at the engine's target synchronous speed, and the available driving power of the battery;

[0114] The equivalent fuel consumption power in parallel mode is determined based on the engine's target speed, engine's target torque, engine's loss power, generator's target speed, generator's target torque, drive motor's target speed, drive motor's target torque, drive motor's loss power, generator's loss power, battery's target charge-discharge loss power, actual SOC, and target SOC determined in parallel mode;

[0115] The equivalent fuel consumption power in series mode is determined based on the engine's target speed, engine's target torque, engine's target loss power, generator's target speed, generator's target torque, drive motor's target speed, drive motor's target torque, drive motor's loss power, generator's loss power, battery's target charge-discharge loss power, actual SOC, and target SOC determined in series mode;

[0116] The first preset value is related to the vehicle's current speed and the actual SOC of the battery.

[0117] Preferably, the first target drive mode determination module includes:

[0118] The first target drive mode determination unit is configured to determine that the vehicle's target drive mode is the parallel drive mode if there is a parallel drive mode request based on the dynamic perspective or a parallel drive mode request based on the economic perspective;

[0119] The second target drive mode determination unit is configured to determine that the vehicle's target drive mode is the series drive mode if there is a series drive mode request based on the dynamic perspective or a series drive mode request based on the economic perspective.

[0120] Preferably, the device further includes:

[0121] The third target drive mode determination module is configured to determine that the vehicle's target drive mode remains the current drive mode unchanged if the vehicle does not meet the preset switching conditions for drive mode switching.

[0122] The present invention also provides a vehicle, including the drive mode switching timing determination device of the hybrid vehicle or the drive mode control device of the hybrid vehicle as described above.

[0123] The present invention also provides a control device, which includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the driving mode switching timing determination method or the driving mode control method of the hybrid vehicle as described above are implemented.

[0124] The present invention also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the driving mode switching timing determination method or the driving mode control method of the hybrid vehicle as described above are implemented.

[0125] The beneficial effects of the present invention are as follows:

[0126] It no longer simply relies on the accuracy of the SOC and vehicle speed signals and calibration experience. Instead, on the basis of considering the vehicle state operating parameters and meeting the driver's power demand, the fuel economy demand is also taken into account. By calculating the power system capacity limited state during the driving mode switching process, that is, the maximum capacity of the series state with synchronous front and rear end speeds before or after the clutch engagement or disengagement is the target synchronous speed series maximum power, combined with the driver's required power, the rationality of considering the driving mode switching timing is determined in advance. On the basis of a reasonable driving mode switching timing, combined with the driver's power demand or economy demand, a suitable target driving mode to be switched is selected, so that the vehicle can perform a reasonable driving mode switching at a reasonable switching timing, avoiding driving performance problems such as weak acceleration and two-stage acceleration during the switching process, especially when the driver has a large throttle acceleration demand. Finally, the rationality of determining the driving mode switching timing is improved, ensuring that the vehicle is always operating in the best suitable driving mode. Description of the Drawings

[0127] Figure 1 It is the power architecture diagram of a hybrid vehicle with a P13 configuration;

[0128] Figure 2 It is the flowchart of the driving mode control method of the hybrid vehicle in this embodiment;

[0129] Figure 3 It is the detailed flowchart of step S130 in this embodiment;

[0130] Figure 4 It is the detailed flowchart of the driving mode control method of the hybrid vehicle in this embodiment;

[0131] Figure 5 It is the flowchart of the driving mode determination method of the hybrid vehicle in this embodiment;

[0132] Figure 6Flow chart of the driving mode determination device for the hybrid vehicle in this embodiment;

[0133] Figure 7 Structural block diagram of the driving mode control device for the hybrid vehicle in this embodiment. Detailed implementation manners

[0134] The following will describe the implementation manners of the present invention by referring to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for explaining the present invention, rather than for limiting the protection scope of the present invention.

[0135] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, number, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0136] Since the hybrid vehicles in the prior art only consider selecting the driving mode of the vehicle by combining some operating parameters of the vehicle (such as the current, power, and vehicle speed involved in the vehicle in the background art), but do not involve the judgment process of how to determine the driving mode switching timing of the vehicle before the driving mode control of the vehicle. In the embodiments of the present invention, to solve this problem, a driving mode control method for a hybrid vehicle is provided. This method combines the driver's power demand and economic demand to improve the rationality of determining the driving mode switching timing of the vehicle, enabling the vehicle to switch the driving mode at a reasonable switching timing, and achieving the effect of making the vehicle operate in the optimal driving mode.

[0137] Refer to Figure 1 , the driving mode control method for the hybrid vehicle provided in this embodiment is mainly applicable to hybrid vehicles with the following characteristics. The hybrid vehicle at least includes: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be coupled or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery. The generator is connected to the engine. The generator is connected to the power battery and / or the drive motor. Specifically for Figure 1 the P13 configuration hybrid vehicle in Figure 1 [[ID=!24]]the drive motor refers to Figure 1 the P3 motor in Figure 1For the K3 clutch in it, for a hybrid vehicle with a P13 configuration, the P1 generator is connected to both the power battery and the P3 drive motor. In this embodiment, the above hybrid vehicle can also be applicable to vehicles with other configurations, as long as these vehicles have the above specific features.

[0138] Such as Figure 2 , in this embodiment, the drive mode control method of the hybrid vehicle provided specifically includes:

[0139] Step S110, obtain the operating parameters of the vehicle.

[0140] In this embodiment, the operating parameters of the vehicle specifically include the following parameters:

[0141] Vehicle speed, engine idle speed, engine state, clutch state, remaining fuel amount of the engine, total speed ratio from the engine to the wheel end, gear lever position of the transmission, maximum drive power of the drive motor at the current speed, long-term maximum discharge power of the battery, low-voltage load power, throttle pedal signal, tire diameter, and total speed ratio from the generator to the wheel end.

[0142] Among them, the above vehicle speed signal is obtained by real-time acquisition from relevant sensors on the vehicle, the tire diameter is a preset value, the gear lever position of the transmission is obtained from the transmission control unit, and the throttle pedal signal is provided by the throttle pedal position sensor. The clutch state refers to the normal or abnormal state of the clutch, including the signal of the clutch being in a fault state and the signal of the clutch being in a normal state. The signal of the clutch state is obtained in the transmission control unit.

[0143] The engine idle speed is the speed of the vehicle engine when running in the neutral state, and this value is a calibrated value. The engine idle speed, remaining fuel amount of the engine, engine idle speed, and engine state can be obtained from the engine control unit. The total speed ratio from the engine to the wheel end is a preset value. The maximum drive power of the drive motor at the current speed is obtained from a predetermined correspondence table pre-calibrated with motor speed and motor maximum drive power. The long-term maximum discharge power of the battery is obtained from the battery control unit. The low-voltage load power is obtained from the thermal management control unit. The total speed ratio from the generator to the wheel end is obtained from a preset value.

[0144] The low-voltage load power includes but is not limited to DC / DC (Direct Current to Direct Current, high-voltage DC to low-voltage DC), PTC (Positive Temperature Coefficient, heating system).

[0145] Step S120, based on the operating parameters of the vehicle, determine whether the vehicle meets the preset entry conditions for entering the parallel drive mode.

[0146] In this step S120, the specific preset entry conditions for entering the parallel drive mode are as follows: vehicle speed > wheel-end vehicle speed, the position of the transmission gear lever is in the forward gear, the remaining fuel quantity of the engine > preset calibration value, the engine state is the running state, and the clutch state is the fault-free state.

[0147] Among them, the above-mentioned wheel-end speed needs to convert the engine idle speed to the wheel-end vehicle speed by combining the overall speed ratio from the engine to the wheel-end, and the conversion process belongs to the technology well-known to those skilled in the art.

[0148] Step S130: If the vehicle meets the preset entry conditions for entering the parallel drive mode, determine whether the vehicle meets the preset switching conditions for driving mode switching based on the operating parameters of the vehicle.

[0149] Combined Figure 3 In view of this, in this embodiment, this step S130 specifically includes:

[0150] Step S1301: Determine the driver's required power according to the vehicle speed and the throttle pedal signal.

[0151] Step S1302: Calculate the maximum driving power at the engine's target synchronous speed according to the vehicle speed, the overall speed ratio from the engine to the wheel-end, and the tire diameter.

[0152] Step S1303: Calculate the maximum power generation power at the generator's target synchronous speed according to the vehicle speed, the overall speed ratio from the generator to the wheel-end, and the tire diameter.

[0153] Step S1304: Determine the available driving power of the battery according to the maximum long-term discharge power of the battery and the low-voltage load power.

[0154] Step S1305: Determine the maximum series-connected power at the target synchronous speed according to the maximum driving power of the drive motor at the current speed, the maximum driving power at the engine's target synchronous speed, and the maximum power generation power at the generator's target synchronous speed.

[0155] Step S1306: If the driver's required power < the maximum series-connected power at the target synchronous speed, determine that the vehicle meets the preset switching conditions for driving mode switching.

[0156] In step S1301, the driver's required power is obtained by looking up a table according to the vehicle speed and the throttle pedal opening. A predetermined corresponding relationship table of the driver's required power, vehicle speed, and throttle pedal opening is pre-calibrated, and the required driver's required power is determined by looking up the table with the real-time vehicle speed and throttle pedal opening.

[0157] In step S1302, in order to obtain the maximum driving power at the engine's target synchronous speed, it needs to be determined according to the following process:

[0158] Step S13021: Calculate the engine synchronous speed based on the vehicle speed, the overall speed ratio from the engine to the wheel end, and the tire diameter.

[0159] Step S13022: Calculate the change rate of the engine synchronous speed based on the engine synchronous speed and the engine synchronous speed calculated N preset cycles ago.

[0160] Step S13023: Calculate the target engine synchronous speed based on the engine synchronous speed and the change rate of the engine synchronous speed.

[0161] Step S13024: Determine the maximum driving power of the target engine synchronous speed based on the target engine synchronous speed.

[0162] Specifically, in step S13021, the engine synchronous speed is calculated through the calculation formula:

[0163]

[0164] to calculate the engine synchronous speed , where VehSpd is the vehicle speed, is the overall speed ratio from the engine to the wheel end, and D is the tire diameter.

[0165] In step S13022, the change rate of the engine synchronous speed is calculated through the calculation formula:

[0166]

[0167] to calculate the change rate of the engine synchronous speed , is the engine synchronous speed, is the engine synchronous speed calculated N preset cycles ago.

[0168] In step S13023, the target engine synchronous speed is calculated through the calculation formula:

[0169]

[0170] to calculate the target engine synchronous speed , is the engine synchronous speed, is the change rate of the engine synchronous speed; is a prediction coefficient, which is a preset calibration value, such as a value of 1, etc.

[0171] In step S13024, a predetermined corresponding relationship table between the target engine synchronous speed and the maximum driving power of the target engine synchronous speed is pre-calibrated, and the maximum driving power EngPwrMaxsynspd corresponding to the current engine synchronous speed is determined by looking up the table.

[0172] In step S1303, in order to obtain the maximum power generation of the generator at the target synchronous speed, it needs to be determined according to the following process:

[0173] In step S13031, calculate the synchronous speed of the generator according to the vehicle speed, the overall speed ratio from the generator to the wheel end, and the tire diameter;

[0174] In step S13032, calculate the change rate of the generator synchronous speed according to the generator synchronous speed and the generator synchronous speed calculated N preset cycles ago;

[0175] In step S13033, calculate the target synchronous speed of the generator according to the generator synchronous speed and the generator synchronous change rate;

[0176] In step S13034, determine the maximum power generation of the generator at the target synchronous speed according to the target synchronous speed of the generator.

[0177] Specifically, in step S13031, through the calculation formula:

[0178]

[0179] to calculate the synchronous speed of the generator , where is the vehicle speed, is the overall speed ratio from the generator to the wheel end, and D is the tire diameter.

[0180] In step S13032, through the calculation formula:

[0181]

[0182] to calculate the change rate of the generator synchronous speed , is the generator synchronous speed, is the generator synchronous speed calculated N preset cycles ago.

[0183] In step S13023, through the calculation formula:

[0184]

[0185] to calculate the target synchronous speed of the generator , is the generator synchronous speed, is the generator synchronous speed change rate; is the prediction coefficient, which is a preset calibration value, such as the value is 1, etc.

[0186] In step S13024, a predetermined correspondence table of the generator target synchronous speed and the maximum driving power of the generator synchronous speed is pre-calibrated, and the maximum power generation power P1GenPwrMaxsynspd corresponding to the current generator synchronous speed is determined by looking up the table.

[0187] In step S1304, through the calculation formula:

[0188] BattDrvPwr = BattSchaPwrLT - NoTracPwr

[0189] to calculate the available driving power BattDrvPwr of the battery, where BattSchaPwrLT is the maximum long-term discharge power of the battery and NoTracPwr is the low-voltage load power.

[0190] In step S1305, through the calculation formula:

[0191] to calculate the maximum series power at the target synchronous speed , is the maximum driving power of the drive motor at the current speed (for Figure 1 the P13 configuration vehicle, this parameter value is the maximum driving power of the P3 motor at the current speed, and this value is specifically determined by looking up the table according to the predetermined correspondence between the current speed and the maximum driving power of the P3 motor), is the maximum driving power of the engine target synchronous speed, is the maximum power generation power of the generator target synchronous speed (for Figure 1 the P13 configuration vehicle, this parameter value is the maximum power generation power of the P1 motor target synchronous speed), is the available driving power of the battery.

[0192] After performing the above step S130, if the vehicle meets the preset switching conditions for driving mode switching, it is considered that the current timing for driving mode switching is reasonable and the driving mode can be switched.

[0193] Step S140, if the vehicle meets the preset switching conditions for driving mode switching, determine the target driving mode of the vehicle based on the driving mode request.

[0194] In the above step S140, the driving mode request is output by the driving mode request function module of the vehicle; or

[0195] the driving mode request is generated based on the operating parameters of the vehicle.

[0196] When the driving mode request is output by the driving mode request function module of the vehicle, the driving mode request function module of the vehicle can be integrated into the existing relevant controllers of the vehicle. At this time, the existing relevant controllers also generate the driving mode request based on the operating parameters of the vehicle.

[0197] In this embodiment, preferably, the driving mode request is generated based on the operating parameters of the vehicle.

[0198] The driving mode request includes a driving mode request based on the dynamic performance angle and a driving mode request based on the economic performance angle. The driving mode request based on the dynamic performance angle includes a parallel driving mode request based on the dynamic performance angle and a series driving mode request based on the dynamic performance. The driving mode request based on the economic performance angle includes a parallel driving mode request based on the economic performance angle and a series driving mode request based on the economic performance; among which,

[0199] If the first preset value < driver's required power < maximum power of the target synchronous speed in series, it is determined that there is a driving mode request based on the dynamic performance angle;

[0200] On the basis of the existence of a driving mode request based on the dynamic performance angle, if the value of the maximum power in the parallel mode minus the maximum power in the series mode > the second preset value, it is determined that a parallel driving mode request based on the dynamic performance angle is received; otherwise, it is determined that a series driving mode request based on the dynamic performance angle is received;

[0201] If the driver's required power ≤ the first preset value, it is determined that there is a driving mode request based on the economic performance angle;

[0202] On the basis of the existence of a driving mode request based on the economic performance angle, if the value of the equivalent fuel consumption power in the series mode minus the equivalent fuel consumption power in the parallel mode > the third preset value, it is determined that a parallel driving mode request based on the economic performance angle is received; otherwise, it is determined that a series driving mode request based on the economic performance angle is received;

[0203] The maximum power of the target synchronous speed in series is determined according to the maximum driving power of the driving motor at the current speed, vehicle speed, total speed ratio from the engine to the wheel end, total speed ratio from the generator to the wheel end, and tire diameter;

[0204] The maximum power in the series mode is determined according to the maximum driving power of the driving motor at the current speed, the maximum driving power of the engine's external characteristic, the maximum power generation power of the generator's external characteristic, and the available driving power of the battery;

[0205] The maximum power in the parallel mode is determined according to the maximum driving power of the driving motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the available driving power of the battery;

[0206] The equivalent fuel consumption power in the parallel mode is determined based on the engine target speed, engine target torque, engine target loss power, drive motor target speed, drive motor target torque, drive motor loss power, battery target charge-discharge loss power, actual SOC, and target SOC determined in the parallel mode;

[0207] The equivalent fuel consumption power in the series mode is determined based on the engine target speed, engine target torque, engine target loss power, generator target speed, generator target torque, drive motor target speed, drive motor target torque, drive motor loss power, generator loss power, battery target charge-discharge loss power, actual SOC, and target SOC determined in the series mode;

[0208] The first preset value is related to the current vehicle speed and the actual SOC of the battery.

[0209] Specifically, to determine whether there is a drive mode request based on the dynamic performance perspective or a series drive mode request based on economy, it is necessary to first calculate the target synchronous speed series maximum power and the driver demand power of the above requirements.

[0210] Based on the existence of a drive mode request based on the dynamic performance perspective or on the basis of a drive mode request based on the dynamic performance perspective, to confirm whether there is a parallel drive mode request or a series drive mode request based on the dynamic performance perspective as described above, it is necessary to first calculate the maximum power in the parallel mode and the maximum power in the series mode of the above requirements.

[0211] To calculate the maximum power in the series mode, use the formula:

[0212] Calculate the maximum power in the series mode , is the maximum drive power of the drive motor at the current speed (for a P13 configuration vehicle of Figure 1 , this parameter value is the maximum drive power of the P3 motor at the current speed), is the maximum drive power of the engine's external characteristic, is the maximum power generation power of the generator's external characteristic (for a P13 configuration vehicle of Figure 1 , this parameter value is the maximum power generation power of the P1 motor's external characteristic), and BattDrvPwr is the available drive power of the battery.

[0213] Then, to calculate the maximum power in the parallel mode, use the formula:

[0214] Calculate the maximum power in the parallel mode , is the maximum driving power of the drive motor at the current rotational speed (for a vehicle with the P13 configuration of Figure 1 , this parameter value is the maximum driving power of the P3 motor at the current rotational speed), is the available driving power of the battery, is the maximum driving power at the engine target synchronous speed.

[0215] In this embodiment, it is necessary to first analyze the driver's demand based on rules, transient equivalent fuel consumption, dynamic programming, or global optimization to obtain the engine target speed, engine target torque, engine target loss power, generator target speed, generator target torque, drive motor target speed, drive motor target torque, drive motor loss power, generator loss power, battery target charge-discharge loss power, actual SOC, and target SOC in the series mode and the parallel mode.

[0216] After obtaining these parameters, according to the formula set:

[0217] Fuel consumption power in the parallel mode = engine target speed in the parallel mode * engine target torque in the parallel mode / 9550 + engine target loss power;

[0218] Electric energy consumption power in the parallel mode = generator target speed in the parallel mode * generator target torque in the parallel mode / 9550 + generator loss power in the parallel mode + drive motor target speed in the parallel mode * drive motor target torque in the parallel mode / 9550 + drive motor loss power in the parallel mode + battery target charge-discharge loss power; and

[0219]

[0220] to calculate the equivalent fuel consumption power in the parallel mode , is the equivalent factor, and the setting of this parameter is related to the current actual SOC and the difference between the actual SOC and the target SOC in the parallel mode, and is determined by calibration and look-up table.

[0221] Similarly, according to the formula set:

[0222] Fuel consumption power in the series mode = engine target speed in the series mode * engine target torque in the series mode / 9550 + engine target loss power;

[0223] Electric energy consumption power in the series mode = Generator target speed in series mode * Generator target torque in series mode / 9550 + Generator loss power in series mode + Drive motor target speed in series mode * Drive motor target torque in series mode / 9550 + Drive motor loss power in series mode + Battery target charge / discharge loss power; and

[0224]

[0225] to calculate the equivalent fuel consumption power in series mode , is an equivalent factor, and the setting of this parameter is related to the current actual SOC and the difference between the actual SOC and the target SOC in series mode, and is determined by calibration and look-up table.

[0226] Furthermore, after obtaining the equivalent fuel consumption power in parallel mode and the equivalent fuel consumption power in series mode as described above, based on the driving mode request from an economic perspective or on the basis of the driving mode request from an economic perspective, it is possible to confirm whether there is the above-mentioned parallel drive mode request or series drive mode request from an economic perspective.

[0227] In this embodiment, the driving mode request from a dynamic performance perspective has a higher priority than the driving mode request from an economic perspective.

[0228] Step S50, if the vehicle does not meet the preset entry conditions for entering the parallel drive mode, determine the target driving mode of the vehicle as the series drive mode.

[0229] Under this condition, regardless of whether there is a driving mode request determined based on the vehicle's operating parameters, it is always considered that the target driving mode of the vehicle is the series drive mode, because under this condition, the vehicle condition cannot meet the state for the vehicle to enter the parallel drive mode.

[0230] Step S160, if the vehicle does not meet the preset switching conditions for driving mode switching, determine that the target driving mode of the vehicle remains unchanged as the current driving mode.

[0231] Under this condition, since the current vehicle condition does not meet the driving mode switching, therefore, the vehicle can only be kept in the current driving mode.

[0232] Step S170, perform driving mode control of the vehicle according to the current driving mode and the target driving mode of the vehicle.

[0233] In this step, it includes the situation where the driving mode of the vehicle remains unchanged, the situation where the vehicle switches from the series mode to the parallel mode, and the situation where the vehicle switches from the parallel mode to the series mode. In any case, it is clear to those skilled in the art that the switching of the driving mode of the vehicle mainly involves the switching of the operating states of the engine and the generator described in the background art, which will not be elaborated in this embodiment.

[0234] The above method of this embodiment no longer simply relies on the accuracy of the SOC and vehicle speed signals and calibration experience, but on the basis of considering the vehicle state, while meeting the driver's power demand, taking into account the economic requirements in advance, considering whether the series-parallel switching timing is reasonable in advance, and considering the drive mode control in advance. The maximum capacity of the power system when the vehicle is in front of or after the clutch is engaged or disengaged, that is, the calculation of the maximum power in series at the target synchronous speed, avoids the driving problems of weak acceleration and two-stage acceleration in drive mode control, improves the rationality of determining the series-parallel switching timing, and ensures that the vehicle is always operating in the optimal drive mode.

[0235] Such as Figure 5 , the embodiment of the present invention also provides a method for determining the driving mode switching timing of a hybrid vehicle. The hybrid vehicle at least includes: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be combined with or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery. The generator is connected to the engine. The generator is connected to the power battery and / or the drive motor. The method includes:

[0236] S210, obtaining the operating parameters of the vehicle; the operating parameters include: the maximum driving power of the vehicle's drive motor at the current speed, the long-term maximum discharge power of the battery, the low-voltage load power, the vehicle speed, the throttle pedal signal, the tire diameter, the total speed ratio from the engine to the wheel end, and the total speed ratio from the generator to the wheel end;

[0237] S230, based on the operating parameters of the vehicle, determining whether the vehicle meets the preset switching conditions for driving mode switching;

[0238] S240, if the vehicle meets the preset switching conditions for driving mode switching, determining that the driving mode switching timing of the hybrid vehicle is reasonable.

[0239] In this embodiment, the operating parameters further include: the vehicle speed, the engine idle speed, the engine state, the clutch state, the remaining fuel amount of the engine, and the position of the transmission gear lever. Before the step of determining whether the vehicle meets the preset switching conditions for driving mode switching, the method further includes:

[0240] S220. Determine whether the vehicle meets the preset entry conditions for entering the parallel drive mode based on the vehicle speed, engine idle speed, engine status, clutch status, remaining fuel quantity of the engine, overall speed ratio from the engine to the wheel end, and gear lever position of the transmission.

[0241] If the vehicle meets the preset entry conditions for entering the parallel drive mode, then execute S230, that is, based on the operating parameters of the vehicle, determine whether the vehicle meets the preset switching conditions for driving mode switching.

[0242] Preferably, the step S230 of determining whether the vehicle meets the preset switching conditions for driving mode switching based on the operating parameters of the vehicle includes:

[0243] Determine the driver's required power according to the vehicle speed and the throttle pedal signal;

[0244] Calculate the maximum driving power at the engine target synchronous speed according to the vehicle speed, the overall speed ratio from the engine to the wheel end, and the tire diameter;

[0245] Calculate the maximum power generation power at the generator target synchronous speed according to the vehicle speed, the overall speed ratio from the generator to the wheel end, and the tire diameter;

[0246] Determine the available driving power of the battery according to the maximum long-term discharge power of the battery and the low-voltage load power;

[0247] Determine the maximum series-connected power at the target synchronous speed according to the maximum driving power of the drive motor at the current speed, the maximum driving power at the engine target synchronous speed, and the maximum power generation power at the generator target synchronous speed; [[ID=2…]]

[0248] If the driver's required power < the maximum series-connected power at the target synchronous speed, determine that the vehicle meets the preset switching conditions for driving mode switching.

[0249] Preferably, the step of calculating the maximum driving power at the engine target synchronous speed according to the vehicle speed, the overall speed ratio from the engine to the wheel end, and the tire diameter includes:

[0250] Calculate the engine synchronous speed according to the vehicle speed, the overall speed ratio from the engine to the wheel end, and the tire diameter;

[0251] Calculate the engine synchronous speed change rate according to the engine synchronous speed and the engine synchronous speed calculated N preset cycles ago;

[0252] Calculate the engine target synchronous speed according to the engine synchronous speed and the engine synchronous change rate;

[0253] Determine the maximum driving power at the engine target synchronous speed according to the engine target synchronous speed.

[0254] Preferably, the steps of calculating the maximum power generation power of the generator target synchronous speed according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter include:

[0255] Calculate the generator synchronous speed according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0256] Calculate the generator synchronous speed change rate according to the generator synchronous speed and the generator synchronous speed calculated N preset cycles ago;

[0257] Calculate the generator target synchronous speed according to the generator synchronous speed and the generator synchronous change rate;

[0258] Determine the maximum power generation power of the generator target synchronous speed according to the generator target synchronous speed.

[0259] Preferably, the step S220 of determining whether the vehicle meets the preset entry conditions for entering the parallel drive mode based on the vehicle's operating parameters includes:

[0260] Convert the engine idle speed to the vehicle speed at the wheel end in combination with the total speed ratio from the engine to the wheel end;

[0261] If the vehicle speed > the vehicle speed at the wheel end, the gear lever position of the transmission is in the forward gear, the remaining engine fuel > the preset calibration value, the engine state is in the running state, and the clutch state is in the fault-free state, it is determined that the vehicle meets the preset entry conditions for entering the parallel drive mode.

[0262] The specific execution processes of the parallel drive mode entry condition judgment process, the drive mode switching timing judgment process, and the drive mode switching timing judgment process are the same as those described in the above control method.

[0263] In the above determination method of this embodiment, on the basis of considering the vehicle state and meeting the driver's power demand, the economic demand is also considered, and whether the drive mode switching timing is reasonable is considered in advance.

[0264] Such as Figure 6 , the present invention also provides a determination device for the drive mode switching timing of a hybrid vehicle. The hybrid vehicle at least includes: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be combined with or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery. The generator is connected to the engine. The generator is connected to the power battery and / or the drive motor. The device includes:

[0265] An acquisition module 301 is configured to acquire vehicle operating parameters, including the maximum drive power of the vehicle's drive motor at a current speed, the battery's maximum long-term discharge power, low-voltage load power, vehicle speed, accelerator pedal signal, tire diameter, engine-to-wheel total speed ratio, and generator-to-wheel total speed ratio.

[0266] A driving mode switching condition judgment module 303 is used to judge whether the vehicle meets a preset switching condition for switching the driving mode based on the vehicle's operating parameters;

[0267] The driving mode switching timing determination module 304 is configured to determine whether the driving mode switching timing of the hybrid vehicle is reasonable if the vehicle meets the preset switching conditions for the driving mode switching.

[0268] Preferably, the operating parameters further include: vehicle speed, engine idle speed, engine status, clutch status, engine remaining fuel volume and transmission lever position, and the device further includes:

[0269] a parallel drive mode entry condition determination module 302 for determining whether the vehicle meets a preset entry condition for entering the parallel drive mode based on the vehicle speed, engine idle speed, engine status, clutch status, engine fuel remaining, engine-to-wheel speed ratio, and transmission lever position;

[0270] If the vehicle meets the preset entry conditions for entering the parallel drive mode, the drive mode switching timing determination module 303 then determines whether the vehicle meets the preset switching conditions for switching the drive mode based on the vehicle's operating parameters.

[0271] The specific execution processes of the parallel driving mode entry condition judgment module 302 , the driving mode switching timing judgment module 303 and the driving mode switching timing judgment module 304 are consistent with the description of the above control method.

[0272] The above-mentioned determination device of this embodiment considers whether the timing of driving mode switching is reasonable in advance based on the vehicle state and on the premise of satisfying the driver's power demand, taking into account the economic demand.

[0273] like Figure 7 The present invention further provides a driving mode control device for a hybrid vehicle, the hybrid vehicle comprising at least: a power battery, an engine, a drive motor, a generator, and a clutch, the engine being connectable to or disconnectable from a wheel end via the clutch, the drive motor being directly connected to the wheel end, the drive motor being connected to the power battery, the generator being connected to the engine, and the generator being connected to the power battery and / or the drive motor, the device comprising:

[0274] An acquisition module 401, configured to acquire the operating parameters of a vehicle;

[0275] A preset switching condition judgment module 403, configured to judge whether the vehicle meets a preset switching condition for driving mode switching based on the operating parameters of the vehicle;

[0276] A first target driving mode determination module 404, configured to determine the target driving mode of the vehicle based on a driving mode request if the vehicle meets the preset switching condition for driving mode switching;

[0277] A first driving mode control module 407, configured to control the driving mode of the vehicle according to the current driving mode and the target driving mode of the vehicle.

[0278] Preferably, the device further includes:

[0279] A preset entry condition judgment module 402, configured to judge whether the vehicle meets a preset entry condition for entering a parallel driving mode based on the operating parameters of the vehicle;

[0280] A second target driving mode determination module 405, configured to determine the target driving mode of the vehicle as a series driving mode if the vehicle does not meet the preset entry condition for entering a parallel driving mode.

[0281] Preferably, the operating parameters of the vehicle include: vehicle speed, engine idle speed, engine state, clutch state, remaining fuel quantity of the engine, total speed ratio from the engine to the wheel end, and gearshift lever position of the gearbox. The preset entry condition judgment module 402 includes:

[0282] A wheel-end vehicle speed conversion unit 4021, configured to convert the engine idle speed to the wheel-end vehicle speed in combination with the total speed ratio from the engine to the wheel end;

[0283] A preset entry condition judgment unit 4022, configured to determine that the vehicle meets the preset entry condition for entering a parallel driving mode if vehicle speed > wheel-end vehicle speed, the gearshift lever position of the gearbox is in the forward gear, the remaining fuel quantity of the engine > preset calibration value, the engine state is the operating state, and the clutch state is the fault-free state.

[0284] Preferably, the operating parameters of the vehicle include: maximum driving power of the drive motor at the current speed, maximum long-time discharge power of the battery, low-voltage load power, vehicle speed, accelerator pedal signal, tire diameter, total speed ratio from the engine to the wheel end, and total speed ratio from the generator to the wheel end. The preset switching condition judgment module 403 includes:

[0285] A driver demand power determination unit 4031, configured to determine the driver demand power according to the vehicle speed and the accelerator pedal signal;

[0286] The engine target synchronous speed maximum driving power determination unit 4032 is configured to calculate the engine target synchronous speed maximum driving power according to the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter;

[0287] The generator target synchronous speed maximum power generation power determination unit 4033 is configured to calculate the generator target synchronous speed maximum power generation power according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0288] The battery available driving power determination unit 4034 is configured to determine the battery available driving power according to the battery long-time maximum discharge power and the low-voltage load power;

[0289] The target synchronous speed series maximum power determination unit 4035 is configured to determine the target synchronous speed series maximum power according to the maximum driving power of the drive motor at the current speed, the engine target synchronous speed maximum driving power, and the generator target synchronous speed maximum power generation power;

[0290] The preset switching condition judgment unit 4036 is configured to determine that the vehicle meets the preset switching conditions for driving mode switching if the driver demand power < the target synchronous speed series maximum power.

[0291] Preferably, the driving mode request includes a driving mode request based on the dynamic performance angle and a driving mode request based on the economic performance angle. The driving mode request based on the dynamic performance angle includes a parallel driving mode request based on the dynamic performance angle and a series driving mode request based on the dynamic performance. The driving mode request based on the economic performance angle includes a parallel driving mode request based on the economic performance angle and a series driving mode request based on the economic performance; wherein,

[0292] If the first preset value < the driver demand power < the target synchronous speed series maximum power, it is determined that there is a driving mode request based on the dynamic performance angle;

[0293] On the basis of the existence of a driving mode request based on the dynamic performance angle, if the value of the maximum power of the parallel mode minus the maximum power of the series mode > the second preset value, it is determined that a parallel driving mode request based on the dynamic performance angle is received; otherwise, it is determined that a series driving mode request based on the dynamic performance angle is received;

[0294] If the driver demand power ≤ the first preset value, it is determined that there is a driving mode request based on the economic performance angle;

[0295] On the basis of the existence of a driving mode request based on the economic performance angle, if the value of the equivalent fuel consumption power of the series mode minus the equivalent fuel consumption power of the parallel mode > the third preset value, it is determined that a parallel driving mode request based on the economic performance angle is received; otherwise, it is determined that a series driving mode request based on the economic performance angle is received;

[0296] The target synchronous speed series maximum power is determined according to the maximum driving power of the drive motor at the current speed, the vehicle speed, the total speed ratio from the engine to the wheel end, the total speed ratio from the generator to the wheel end, and the tire diameter;

[0297] The series mode maximum power is determined according to the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine external characteristic, the maximum power generation power of the generator external characteristic, and the available driving power of the battery;

[0298] The parallel mode maximum power is determined according to the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the available driving power of the battery;

[0299] The equivalent fuel consumption power in the parallel mode is determined according to the engine target speed, engine target torque, engine target loss power, generator target speed, generator target torque, drive motor target speed, drive motor target torque, drive motor loss power, generator loss power, battery target charge and discharge loss power, actual SOC, and target SOC determined in the parallel mode;

[0300] The equivalent fuel consumption power in the series mode is determined according to the engine target speed, engine target torque, engine target loss power, generator target speed, generator target torque, drive motor target speed, drive motor target torque, drive motor loss power, generator loss power, battery target charge and discharge loss power, actual SOC, and target SOC determined in the series mode;

[0301] The first preset value is related to the current vehicle speed and the actual SOC of the battery.

[0302] Preferably, the first target driving mode determination module 404 includes:

[0303] The first target driving mode determination unit 4041 is configured to determine that the target driving mode of the vehicle is the parallel driving mode if there is a parallel driving mode request based on the dynamic performance angle or a parallel driving mode request based on the economic performance angle;

[0304] The second target driving mode determination unit 4042 is configured to determine that the target driving mode of the vehicle is the series driving mode if there is a series driving mode request based on the dynamic performance angle or a series driving mode request based on the economic performance angle.

[0305] Preferably, the device further includes:

[0306] The third target driving mode determination module 406 is configured to determine that the target driving mode of the vehicle remains the current driving mode unchanged if the vehicle does not meet the preset switching conditions for driving mode switching.

[0307] In the above device of this embodiment, each module can borrow the specific steps of the control method in the above embodiment when executing the specific logic process, and this device has the same technical effects as the above method.

[0308] The present invention also provides a vehicle, including the driving mode switching timing determination device of the above hybrid vehicle or the driving mode control device of the above hybrid vehicle.

[0309] The present invention also provides a control device, including a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, it realizes the steps of the driving mode switching timing determination method of the above hybrid vehicle or the driving mode control method of the above hybrid vehicle.

[0310] The present invention also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, it realizes the steps of the driving mode switching timing determination method of the above hybrid vehicle or the driving mode control method of the above hybrid vehicle.

[0311] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for determining a driving mode switching timing of a hybrid vehicle, characterized in that: The hybrid vehicle comprises at least: a power battery, an engine, a drive motor, a generator, and a clutch, wherein the engine can be coupled to or disconnected from the wheel end via the clutch, the drive motor is directly connected to the wheel end, the drive motor is connected to the power battery, the generator is connected to the engine, and the generator is connected to the power battery and / or the drive motor. The method comprises: Obtaining vehicle operating parameters; the operating parameters include: the maximum driving power of the vehicle's drive motor at the current speed, the maximum long-term discharge power of the battery, the low-voltage load power, the vehicle speed, the accelerator pedal signal, the tire diameter, the engine-to-wheel total speed ratio, and the generator-to-wheel total speed ratio; Based on the vehicle's operating parameters, determining whether the vehicle meets a preset switching condition for switching the driving mode; If the vehicle meets the preset switching conditions for the drive mode switch, determining that the drive mode switch timing of the hybrid vehicle is reasonable; The step of determining whether the vehicle meets a preset switching condition for switching the driving mode based on the vehicle's operating parameters includes: Determine the driver's required power based on vehicle speed and accelerator pedal signal; Calculate the maximum driving power at the target synchronous speed of the engine based on the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter; Calculate the maximum power generated by the generator at the target synchronous speed based on the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter; Determine the battery's available driving power based on the battery's maximum long-term discharge power and low-voltage load power; Determine the target synchronous speed series maximum power based on the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the maximum generating power of the generator at the target synchronous speed; If the driver's required power is less than the target synchronous speed series maximum power, it is determined that the vehicle meets the preset switching conditions for switching the driving mode.

2. The method for determining the driving mode switching timing of a hybrid vehicle according to claim 1, wherein: The operating parameters also include: vehicle speed, engine idle speed, engine status, clutch status, engine remaining fuel level, and transmission lever position. Before determining whether the vehicle meets the preset switching conditions for switching the driving mode, the method further includes: Determining whether the vehicle meets preset entry conditions for entering the parallel drive mode based on the vehicle's speed, engine idle speed, engine status, clutch status, engine fuel remaining, engine-to-wheel speed ratio, and transmission shift lever position; If the vehicle meets the preset entry conditions for entering the parallel drive mode, a step is performed to determine whether the vehicle meets the preset switching conditions for switching the drive mode based on the vehicle's operating parameters.

3. The method for determining the driving mode switching timing of a hybrid vehicle according to claim 1, wherein: The steps of calculating the maximum driving power at the target synchronous speed of the engine according to the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter include: Calculate the engine synchronous speed based on vehicle speed, engine to wheel end total speed ratio and tire diameter; Calculating the engine synchronous speed change rate based on the engine synchronous speed and the engine synchronous speed calculated N preset cycles ago; Calculating the target synchronous speed of the engine according to the synchronous speed of the engine and the synchronous change rate of the engine; The maximum driving power at the target synchronous speed of the engine is determined according to the target synchronous speed of the engine.

4. The method for determining the driving mode switching timing of a hybrid vehicle according to claim 1 or 3, wherein: The steps of calculating the maximum power generation power at the target synchronous speed of the generator based on the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter include: Calculate the synchronous speed of the generator based on the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter; Calculate the rate of change of the synchronous speed of the generator according to the synchronous speed of the generator and the synchronous speed of the generator calculated N preset cycles ago; Calculate the target synchronous speed of the generator according to the synchronous speed of the generator and the synchronous change rate of the generator; According to the target synchronous speed of the generator, the maximum power generation power at the target synchronous speed of the generator is determined.

5. The method for determining the driving mode switching timing of a hybrid vehicle according to claim 2, wherein: The step of determining whether the vehicle meets a preset entry condition for entering the parallel drive mode based on the vehicle's operating parameters includes: Convert the engine idle speed to the wheel end vehicle speed based on the total speed ratio from the engine to the wheel end; If the vehicle speed is greater than the wheel end speed, the transmission lever position is in the forward gear, the engine fuel remaining amount is greater than the preset calibration value, the engine state is in the running state and the clutch state is in the non-fault state, it is determined that the vehicle meets the preset entry conditions for entering the parallel drive mode.

6. A driving mode control method for a hybrid vehicle, characterized in that: The hybrid vehicle comprises at least: a power battery, an engine, a drive motor, a generator, and a clutch, wherein the engine can be coupled to or disconnected from the wheel end via the clutch, the drive motor is directly connected to the wheel end, the drive motor is connected to the power battery, the generator is connected to the engine, and the generator is connected to the power battery and / or the drive motor. The method comprises: Obtain vehicle operating parameters; Based on the vehicle's operating parameters, determining whether the vehicle meets a preset switching condition for switching the driving mode; If the vehicle satisfies a preset switching condition for switching the driving mode, determining a target driving mode of the vehicle based on the driving mode request; performing a driving mode control of the vehicle according to a current driving mode of the vehicle and a target driving mode; The vehicle operating parameters include: a maximum driving power of the drive motor at a current speed, a maximum long-term discharge power of the battery, a low-voltage load power, a vehicle speed, an accelerator pedal signal, a tire diameter, an engine-to-wheel total speed ratio, and a generator-to-wheel total speed ratio. The step of determining whether the vehicle meets a preset switching condition for switching the drive mode based on the vehicle operating parameters includes: Determine the driver's required power based on vehicle speed and accelerator pedal signal; Calculate the maximum driving power at the target synchronous speed of the engine based on the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter; Calculate the maximum power generated by the generator at the target synchronous speed based on the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter; Determine the battery's available driving power based on the battery's maximum long-term discharge power and low-voltage load power; Determine the target synchronous speed series maximum power based on the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the maximum generating power of the generator at the target synchronous speed; If the driver's required power is less than the target synchronous speed series maximum power, it is determined that the vehicle meets the preset switching conditions for switching the driving mode.

7. The driving mode control method of a hybrid vehicle according to claim 6, characterized in that: Before determining whether the vehicle satisfies a preset switching condition for switching the driving mode, the method further includes: determining, based on the vehicle's operating parameters, whether the vehicle meets preset entry conditions for entering the parallel drive mode; If the vehicle satisfies the preset entry conditions for entering the parallel drive mode, then executing the step of determining whether the vehicle satisfies the preset switching conditions for switching the drive mode based on the vehicle's operating parameters; If the vehicle does not meet the preset entry conditions for entering the parallel drive mode, the target drive mode of the vehicle is determined to be the series drive mode, and then the step of controlling the drive mode of the vehicle according to the current drive mode of the vehicle and the target drive mode is executed.

8. The driving mode control method of a hybrid vehicle according to claim 7, characterized in that: The vehicle operating parameters include: vehicle speed, engine idle speed, engine status, clutch status, engine remaining fuel, engine-to-wheel speed ratio, and transmission lever position. Based on the vehicle operating parameters, the step of determining whether the vehicle meets the preset entry conditions for entering the parallel drive mode includes: Convert the engine idle speed to the wheel end vehicle speed based on the total speed ratio from the engine to the wheel end; If the vehicle speed is greater than the wheel end speed, the transmission lever position is in the forward gear, the engine fuel remaining amount is greater than the preset calibration value, the engine state is in the running state and the clutch state is in the non-fault state, it is determined that the vehicle meets the preset entry conditions for entering the parallel drive mode.

9. The driving mode control method of a hybrid vehicle according to claim 8, characterized in that: The steps of calculating the maximum driving power at the target synchronous speed of the engine according to the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter include: Calculate the engine synchronous speed based on vehicle speed, engine to wheel end total speed ratio and tire diameter; Calculating the engine synchronous speed change rate based on the engine synchronous speed and the engine synchronous speed calculated N preset cycles ago; Calculating the target synchronous speed of the engine according to the synchronous speed of the engine and the synchronous change rate of the engine; The maximum driving power at the target synchronous speed of the engine is determined according to the target synchronous speed of the engine.

10. The driving mode control method of a hybrid vehicle according to claim 8 or 9, characterized in that: The steps of calculating the maximum power generation power at the target synchronous speed of the generator based on the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter include: Calculate the synchronous speed of the generator based on the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter; Calculate the rate of change of the synchronous speed of the generator according to the synchronous speed of the generator and the synchronous speed of the generator calculated N preset cycles ago; Calculate the target synchronous speed of the generator according to the synchronous speed of the generator and the synchronous change rate of the generator; According to the target synchronous speed of the generator, the maximum power generation power at the target synchronous speed of the generator is determined.

11. The driving mode control method of a hybrid vehicle according to claim 6, characterized in that: The driving mode request is output by a driving mode request functional module of the vehicle; or The drive mode request is generated based on operating parameters of the vehicle.

12. The driving mode control method of a hybrid vehicle according to claim 6 or 11, characterized in that: The driving mode request includes a driving mode request based on a power perspective and a driving mode request based on an economy perspective. The driving mode request based on a power perspective includes a parallel driving mode request based on a power perspective and a series driving mode request based on a power perspective. The driving mode request based on an economy perspective includes a parallel driving mode request based on an economy perspective and a series driving mode request based on an economy perspective. If the first preset value is less than the driver's required power and less than the target synchronous speed series maximum power, determining that there is a driving mode request based on the power performance angle; If, based on the presence of a drive mode request based on a power angle, the value of the parallel mode maximum power minus the series mode maximum power is greater than a second predetermined value, it is determined that a parallel drive mode request based on a power angle has been received; otherwise, it is determined that a series drive mode request based on a power angle has been received; If the driver's required power is less than or equal to a first predetermined value, determining that there is a driving mode request based on an economic perspective; If, based on the presence of a drive mode request based on an economy perspective, the value of the series mode equivalent fuel consumption power minus the parallel mode equivalent fuel consumption power is greater than a third predetermined value, it is determined that the parallel drive mode request based on an economy perspective has been received; otherwise, it is determined that the series drive mode request based on an economy perspective has been received; The target synchronous speed series maximum power is determined based on the maximum drive power of the drive motor at the current speed, vehicle speed, engine-to-wheel speed ratio, generator-to-wheel speed ratio, and tire diameter. The maximum power in series mode is determined by the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine's external characteristics, the maximum power generation power of the generator's external characteristics, and the battery's available driving power. The maximum power in parallel mode is determined by the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the available driving power of the battery; The parallel mode equivalent fuel consumption power is determined based on the engine target speed, engine target torque, generator target speed, generator target torque, drive motor target speed, drive motor target torque, engine power loss, drive motor power loss, generator power loss, battery target charge and discharge power loss, actual SOC, and target SOC determined in the parallel mode; The equivalent fuel consumption power in series mode is determined based on the engine target speed, engine target torque, generator target speed, generator target torque, drive motor target speed, drive motor target torque, engine power loss, drive motor power loss, generator power loss, battery target charge and discharge power loss, actual SOC, and target SOC determined in series mode. The first preset value is related to the current speed of the vehicle and the actual SOC of the battery.

13. The driving mode control method of a hybrid vehicle according to claim 12, characterized in that: The step of determining a target driving mode of the vehicle based on the driving mode request includes: If there is a parallel drive mode request based on a power performance perspective or a parallel drive mode request based on an economy perspective, determining that the target drive mode of the vehicle is the parallel drive mode; If there is a series drive mode request based on a power performance perspective or a series drive mode request based on an economy performance perspective, the target drive mode of the vehicle is determined to be the series drive mode.

14. The driving mode control method of a hybrid vehicle according to claim 6, characterized in that: The method further comprises: If the vehicle does not meet the preset switching conditions for switching the driving mode, it is determined that the target driving mode of the vehicle remains unchanged at the current driving mode, and then the step of controlling the driving mode based on the current driving mode and the target driving mode of the vehicle is executed.

15. A driving mode switching timing determination device for a hybrid vehicle, characterized in that: The hybrid vehicle at least includes: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be connected to or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery, the generator is connected to the engine, and the generator is connected to the power battery and / or the drive motor. The device includes: an acquisition module for acquiring vehicle operating parameters; the operating parameters include: the maximum driving power of the vehicle's drive motor at the current speed, the maximum long-term discharge power of the battery, the low-voltage load power, the vehicle speed, the accelerator pedal signal, the tire diameter, the engine-to-wheel total speed ratio, and the generator-to-wheel total speed ratio; The driving mode switching condition judgment module is used to judge whether the vehicle meets the preset switching conditions for driving mode switching based on the vehicle's operating parameters. The driving mode switching condition judgment module is specifically used to: Determine the driver's required power based on vehicle speed and accelerator pedal signal; Calculate the maximum driving power at the target synchronous speed of the engine based on the vehicle speed, the total speed ratio from the engine to the wheel end, and the tire diameter; Calculate the maximum power generated by the generator at the target synchronous speed based on the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter; Determine the battery's available driving power based on the battery's maximum long-term discharge power and low-voltage load power; Determine the target synchronous speed series maximum power based on the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the maximum generating power of the generator at the target synchronous speed; If the driver's required power is less than the target synchronous speed series maximum power, determining that the vehicle meets the preset switching conditions for switching the driving mode; The driving mode switching timing judgment module is used to determine whether the driving mode switching timing of the hybrid vehicle is reasonable if the vehicle meets the preset switching conditions for switching the driving mode.

16. The hybrid vehicle driving mode switching timing determination device according to claim 15, wherein: The operating parameters also include: vehicle speed, engine idle speed, engine status, clutch status, engine remaining fuel volume and transmission lever position, and the device also includes: a parallel drive mode entry condition determination module, configured to determine whether the vehicle meets preset entry conditions for entering the parallel drive mode based on the vehicle's speed, engine idle speed, engine status, clutch status, engine fuel remaining, engine-to-wheel speed ratio, and transmission lever position; If the vehicle meets the preset entry conditions for entering the parallel drive mode, the drive mode switching timing judgment module executes a step of judging whether the vehicle meets the preset switching conditions for switching the drive mode based on the vehicle's operating parameters.

17. A driving mode control device for a hybrid vehicle, characterized in that: The hybrid vehicle at least includes: a power battery, an engine, a drive motor, a generator, and a clutch. The engine can be connected to or disconnected from the wheel end through the clutch. The drive motor is directly connected to the wheel end. The drive motor is connected to the power battery, the generator is connected to the engine, and the generator is connected to the power battery and / or the drive motor. The device includes: An acquisition module, used to obtain the operating parameters of the vehicle; A preset switching condition judgment module is used to judge whether the vehicle meets the preset switching conditions for switching the driving mode based on the operating parameters of the vehicle; a first target driving mode determining module configured to determine a target driving mode of the vehicle based on the driving mode request if the vehicle satisfies a preset switching condition for switching the driving mode; a first driving mode control module, configured to control the driving mode of the vehicle according to the current driving mode of the vehicle and the target driving mode; The vehicle operating parameters include: the maximum driving power of the drive motor at the current speed, the maximum long-term discharge power of the battery, the low-voltage load power, the vehicle speed, the accelerator pedal signal, the tire diameter, the total speed ratio from the engine to the wheel end, and the total speed ratio from the generator to the wheel end. The preset switching condition judgment module includes: a driver demand power determination unit, configured to determine the driver demand power based on vehicle speed and an accelerator pedal signal; an engine target synchronous speed maximum driving power determination unit, for calculating the engine target synchronous speed maximum driving power based on vehicle speed, engine-to-wheel end total speed ratio, and tire diameter; A generator target synchronous speed maximum power generation determination unit is used to calculate the generator target synchronous speed maximum power generation according to the vehicle speed, the total speed ratio from the generator to the wheel end, and the tire diameter; A battery capable of driving power determination unit is used to determine the battery capable of driving power based on the battery's maximum long-term discharge power and low-voltage load power; a target synchronous speed series maximum power determination unit, configured to determine the target synchronous speed series maximum power according to the maximum driving power of the driving motor at the current speed, the target synchronous speed maximum driving power of the engine, and the target synchronous speed maximum power generation power of the generator; The preset switching condition judgment unit is used to determine that the vehicle meets the preset switching condition for switching the driving mode if the driver's required power is less than the target synchronous speed series maximum power.

18. The driving mode control device for a hybrid vehicle according to claim 17, wherein: The device further includes: a preset entry condition determination module for determining whether the vehicle satisfies a preset entry condition for entering the parallel drive mode based on operating parameters of the vehicle; The second target driving mode determining module is configured to determine that the target driving mode of the vehicle is the series driving mode if the vehicle does not meet a preset entry condition for entering the parallel driving mode.

19. The driving mode control device for a hybrid vehicle according to claim 18, wherein: The vehicle's operating parameters include vehicle speed, engine idle speed, engine status, clutch status, engine remaining fuel, engine-to-wheel speed ratio, and transmission lever position. The preset entry condition judgment module includes: A wheel-end vehicle speed conversion unit is used to convert the engine idle speed to the wheel-end vehicle speed in combination with the total speed ratio from the engine to the wheel end; The preset entry condition judgment unit is used to determine that the vehicle meets the preset entry conditions for entering the parallel drive mode if the vehicle speed is greater than the wheel end speed, the transmission lever position is the forward gear, the engine fuel remaining amount is greater than the preset calibration value, the engine state is the running state and the clutch state is the fault-free state.

20. The driving mode control device for a hybrid vehicle according to claim 17, wherein: The driving mode request includes a driving mode request based on a power perspective and a driving mode request based on an economy perspective. The driving mode request based on a power perspective includes a parallel driving mode request based on a power perspective and a series driving mode request based on a power perspective. The driving mode request based on an economy perspective includes a parallel driving mode request based on an economy perspective and a series driving mode request based on an economy perspective. If the first preset value is less than the driver's required power and less than the target synchronous speed series maximum power, determining that there is a driving mode request based on the power performance angle; If, based on the presence of a drive mode request based on a power angle, the value of the parallel mode maximum power minus the series mode maximum power is greater than a second predetermined value, it is determined that a parallel drive mode request based on a power angle has been received; otherwise, it is determined that a series drive mode request based on a power angle has been received; If the driver's required power is less than or equal to a first predetermined value, determining that there is a driving mode request based on an economic perspective; If, based on the presence of a drive mode request based on an economy perspective, the value of the series mode equivalent fuel consumption power minus the parallel mode equivalent fuel consumption power is greater than a third predetermined value, it is determined that the parallel drive mode request based on an economy perspective has been received; otherwise, it is determined that the series drive mode request based on an economy perspective has been received; The target synchronous speed series maximum power is determined based on the maximum drive power of the drive motor at the current speed, vehicle speed, engine-to-wheel speed ratio, generator-to-wheel speed ratio, and tire diameter. The maximum power in series mode is determined by the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine's external characteristics, the maximum power generation power of the generator's external characteristics, and the battery's available driving power. The maximum power in parallel mode is determined by the maximum driving power of the drive motor at the current speed, the maximum driving power of the engine at the target synchronous speed, and the available driving power of the battery; The parallel mode equivalent fuel consumption power is determined based on the engine target speed, engine target torque, engine power loss, generator target speed, generator target torque, drive motor target speed, drive motor target torque, drive motor power loss, generator power loss, battery target charge and discharge power loss, actual SOC, and target SOC determined in the parallel mode; The equivalent fuel consumption power in series mode is determined based on the engine target speed, engine target torque, engine power loss, generator target speed, generator target torque, drive motor target speed, drive motor target torque, drive motor power loss, generator power loss, battery target charge and discharge power loss, actual SOC, and target SOC determined in series mode. The first preset value is related to the current speed of the vehicle and the actual SOC of the battery.

21. The driving mode control device for a hybrid vehicle according to claim 17, wherein: The first target driving mode determination module includes: a first target driving mode determining unit configured to determine that the target driving mode of the vehicle is the parallel driving mode if there is a parallel driving mode request based on a power performance perspective or a parallel driving mode request based on an economy perspective; The second target driving mode determining unit is configured to determine that the target driving mode of the vehicle is the series driving mode if there is a series driving mode request based on a power performance perspective or a series driving mode request based on an economy performance perspective.

22. The driving mode control device for a hybrid vehicle according to claim 17, wherein: The device further comprises: The third target driving mode determining module is configured to determine that the target driving mode of the vehicle remains unchanged at the current driving mode if the vehicle does not meet a preset switching condition for switching the driving mode.

23. A vehicle, characterized in that: It includes the hybrid vehicle driving mode switching timing determination device according to any one of claims 15 to 16 or the hybrid vehicle driving mode control device according to any one of claims 17 to 22.

24. A control device, characterized in that: The invention comprises a processor, a memory, and a program or instruction stored in the memory and capable of being executed on the processor, wherein when the program or instruction is executed by the processor, the method for determining the timing of driving mode switching of a hybrid vehicle according to any one of claims 1 to 5 or the method for controlling the driving mode of a hybrid vehicle according to any one of claims 6 to 14 is implemented.

25. A storage medium capable of reading, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the steps of the hybrid vehicle driving mode switching timing determination method as described in any one of claims 1 to 5 or the hybrid vehicle driving mode control method as described in any one of claims 6 to 14.

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