Control Method and Device for Hybrid Vehicle, Hybrid Vehicle, and Storage Medium

Abstract

The present disclosure provides a control method and device for a hybrid vehicle, a hybrid vehicle, and a storage medium. The control method includes: obtaining operating parameters of the hybrid vehicle; determining whether the hybrid vehicle meets the drive mode switching condition based on the operating parameters of the hybrid vehicle; calculating the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle when it is determined that the hybrid vehicle meets the drive mode switching condition; and determining a drive mode adjustment strategy for the hybrid vehicle based on the current drive mode of the hybrid vehicle, the operating efficiency of the pure electric drive mode, and the operating efficiency of the engine direct drive mode.

Description

Technical Field

[0001] The present disclosure relates to the field of control of hybrid electric vehicles, and in particular, to a control method and device for a hybrid electric vehicle, a hybrid electric vehicle, and a storage medium. Background Art

[0002] Hybrid Electric Vehicles (HEVs) combine the advantages of fuel vehicles and pure electric vehicles and have become the most promising models in terms of industrialization and marketization. Hybrid electric vehicles include multiple driving modes. Since the price of electric energy required for 100 km is lower than that of fuel, hybrid electric vehicles will preferentially adopt the pure electric driving mode in the default mode. When the remaining State of Charge (SOC) of the power battery drops to a preset lower limit, the engine will intervene and enter the electric balance mode. However, for driving scenarios with a fixed driving route where the electric energy cannot be replenished in time, how to improve the comprehensive driving range of hybrid electric vehicles and improve the situation of shortened comprehensive driving range caused by adopting the pure electric driving mode under high-speed working conditions has become an urgent problem to be solved at present. Summary of the Invention

[0003] In view of this, embodiments of the present disclosure provide a control method and device for a hybrid electric vehicle, a hybrid electric vehicle, and a storage medium to solve at least one problem existing in the prior art.

[0004] To achieve the above object, the technical solutions of the embodiments of the present disclosure are implemented as follows:

[0005] In a first aspect, an embodiment of the present disclosure provides a control method for a hybrid electric vehicle, including:

[0006] Obtain the operating parameters of the hybrid electric vehicle;

[0007] Based on the operating parameters of the hybrid electric vehicle, determine whether the hybrid electric vehicle meets the driving mode switching condition;

[0008] When it is determined that the hybrid electric vehicle meets the driving mode switching condition, calculate the operating efficiency of the pure electric driving mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid electric vehicle;

[0009] Based on the current driving mode of the hybrid electric vehicle, the operating efficiency of the pure electric driving mode, and the operating efficiency of the engine direct drive mode, determine the driving mode adjustment strategy of the hybrid electric vehicle.

[0010] In an optional implementation manner, the hybrid electric vehicle includes: a drive motor, a power battery, and an engine; the calculating the operating efficiency of the pure electric driving mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid electric vehicle includes:

[0011] Calculate the driving efficiency of the drive motor based on the operating parameters of the hybrid vehicle;

[0012] Calculate the discharge efficiency of the power battery based on the operating parameters of the hybrid vehicle and the driving efficiency of the drive motor;

[0013] Multiply the driving efficiency of the drive motor and the discharge efficiency of the power battery to obtain the operating efficiency of the pure electric drive mode;

[0014] Calculate the fuel efficiency of the engine based on the operating parameters of the hybrid vehicle;

[0015] Calculate the ignition efficiency of the engine based on the operating parameters of the hybrid vehicle;

[0016] Multiply the fuel efficiency of the engine and the ignition efficiency to obtain the operating efficiency of the engine direct drive mode.

[0017] In an alternative embodiment, the hybrid vehicle further includes: a wheel drive shaft; the operating parameters of the hybrid vehicle include: vehicle speed, accelerator pedal opening, bus voltage; the calculating the driving efficiency of the drive motor based on the operating parameters of the hybrid vehicle includes:

[0018] Query the accelerator pedal MAP table to obtain the wheel side torque corresponding to the vehicle speed and the accelerator pedal opening;

[0019] Calculate the rotational speed of the drive motor according to the vehicle speed, the first speed ratio, and the tire diameter of the hybrid vehicle; the first speed ratio is the speed ratio between the drive motor and the wheel drive shaft;

[0020] Calculate the torque of the drive motor according to the wheel side torque and the first speed ratio;

[0021] Query the first driving efficiency MAP table of the drive motor corresponding to the first calibrated voltage to obtain the first driving efficiency corresponding to the rotational speed and the torque of the drive motor;

[0022] Query the second driving efficiency MAP table of the drive motor corresponding to the second calibrated voltage to obtain the second driving efficiency corresponding to the rotational speed and the torque of the drive motor;

[0023] Perform linear interpolation on the first driving efficiency and the second driving efficiency according to the bus voltage to obtain the driving efficiency of the drive motor.

[0024] In an alternative embodiment, the calculating the discharge efficiency of the power battery based on the operating parameters of the hybrid vehicle and the driving efficiency of the drive motor includes:

[0025] Calculate the required power of the drive motor according to the rotational speed of the drive motor, the torque of the drive motor, and the drive efficiency of the drive motor;

[0026] Calculate the discharge current of the power battery according to the required power of the drive motor and the bus voltage;

[0027] Calculate the discharge loss power of the power battery according to the discharge current of the power battery and the internal resistance of the power battery;

[0028] Calculate the discharge efficiency of the power battery according to the required power and the discharge loss power of the power battery.

[0029] In an alternative embodiment, calculating the fuel efficiency of the engine based on the operating parameters of the hybrid vehicle includes:

[0030] Calculate the rotational speed of the engine according to the vehicle speed, the second speed ratio, and the tire diameter; the second speed ratio is the speed ratio between the engine and the wheel drive shaft;

[0031] Calculate the torque of the engine according to the wheel-side torque and the second speed ratio;

[0032] Query the specific fuel consumption MAP table of the engine to obtain the specific fuel consumption value corresponding to the rotational speed and the torque of the engine;

[0033] Calculate the fuel efficiency of the engine according to the specific fuel consumption value and the optimal specific fuel consumption value in the specific fuel consumption MAP table.

[0034] In an alternative embodiment, the operating parameters of the hybrid vehicle further include: the actual ignition angle retard; calculating the ignition efficiency of the engine based on the operating parameters of the hybrid vehicle includes:

[0035] Query the relationship curve between the ignition angle retard and the ignition efficiency to obtain the first ignition efficiency corresponding to the actual ignition angle retard;

[0036] Calculate the ignition efficiency of the engine according to the first ignition efficiency and the second ignition efficiency measured in the bench test.

[0037] In an alternative embodiment, the operating parameters of the hybrid vehicle further include: the remaining power of the power battery; determining whether the hybrid vehicle meets the drive mode switching condition includes:

[0038] Determine whether the hybrid vehicle is in the driving high-voltage state and determine whether the remaining power of the power battery is within a preset range;

[0039] When the hybrid vehicle is in the driving high-voltage state and the remaining power of the power battery is within the preset range, determine whether the hybrid vehicle is in the fuel priority mode;

[0040] When the hybrid vehicle is in the fuel priority mode, determine whether the vehicle speed of the hybrid vehicle is higher than a preset vehicle speed;

[0041] When the vehicle speed of the hybrid vehicle is higher than the preset vehicle speed, determine that the hybrid vehicle meets the drive mode switching condition.

[0042] In an alternative embodiment, the determining the drive mode adjustment strategy of the hybrid vehicle based on the current drive mode of the hybrid vehicle, the operating efficiency of the pure electric drive mode, and the operating efficiency of the engine direct drive mode includes:

[0043] Calculate the ratio of the operating efficiency of the engine direct drive mode to the operating efficiency of the pure electric drive mode;

[0044] When the current drive mode of the hybrid vehicle is the pure electric drive mode, compare the ratio with a first preset ratio. When the ratio is greater than the first preset ratio and the duration exceeds a first preset time, determine to switch the drive mode of the hybrid vehicle from the pure electric drive mode to the engine direct drive mode; the first preset ratio is greater than 1;

[0045] When the current drive mode of the hybrid vehicle is the engine direct drive mode, compare the ratio with a second preset ratio. When the ratio is less than the second preset ratio and the duration exceeds a second preset time, determine to switch the drive mode of the hybrid vehicle from the engine direct drive mode to the pure electric drive mode; the second preset ratio is less than 1.

[0046] In an alternative embodiment, the hybrid vehicle further includes: a direct drive clutch located between the engine and the wheel drive shaft of the hybrid vehicle; the control method of the hybrid vehicle further includes:

[0047] When it is determined to switch the drive mode of the hybrid vehicle from the pure electric drive mode to the engine direct drive mode, start the engine and engage the direct drive clutch;

[0048] When it is determined to switch the drive mode of the hybrid vehicle from the engine direct drive mode to the pure electric drive mode, turn off the engine and disengage the direct drive clutch.

[0049] In a second aspect, an embodiment of the present disclosure provides a control device for a hybrid vehicle, including:

[0050] An acquisition module, configured to: acquire the operating parameters of a hybrid vehicle;

[0051] A first determination module, configured to: determine whether the hybrid vehicle meets the drive mode switching condition based on the operating parameters of the hybrid vehicle;

[0052] An operating efficiency calculation module, configured to: calculate the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle when it is determined that the hybrid vehicle meets the drive mode switching condition;

[0053] A second determination module, configured to: determine the drive mode adjustment strategy of the hybrid vehicle based on the current drive mode of the hybrid vehicle, the operating efficiency of the pure electric drive mode, and the operating efficiency of the engine direct drive mode.

[0054] In a third aspect, an embodiment of the present disclosure provides a hybrid vehicle, including: a memory, a processor, and a program stored on the memory, and when the processor executes the program, it implements the control method of the hybrid vehicle according to any one of the above embodiments.

[0055] In a fourth aspect, an embodiment of the present disclosure provides a storage medium, on which a program is stored, and when a processor executes the program, it implements the control method of the hybrid vehicle according to any one of the above embodiments.

[0056] In the technical solution provided by the present disclosure, it is determined whether the hybrid vehicle meets the drive mode switching condition based on the current operating parameters of the hybrid vehicle. When the hybrid vehicle meets the drive mode switching condition, the operating efficiency of the engine direct drive mode and the operating efficiency of the pure electric drive mode are calculated based on the operating parameters of the hybrid vehicle, and the adjustment strategy of the drive mode of the hybrid vehicle is determined based on the current drive mode of the hybrid vehicle and the ratio of the operating efficiency of the engine direct drive mode to the operating efficiency of the pure electric drive mode. Thus, the drive mode of the hybrid vehicle can be timely switched to a drive mode with higher operating efficiency, thereby improving the comprehensive cruising range of the hybrid vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 Flow chart of the control method of the hybrid vehicle provided by the embodiment of the present disclosure Figure 1 ;

[0058] Figure 2 Flow chart of the control method of the hybrid vehicle provided by the embodiment of the present disclosure Figure 2 ;

[0059] Figure 3 Flow chart of the control method of the hybrid vehicle provided by the embodiment of the present disclosure Figure 3 ;

[0060] Figure 4 Flow schematic of the control method for a hybrid vehicle provided by an embodiment of the present disclosure Figure 4 ;

[0061] Figure 5 Flow schematic of the control method for a hybrid vehicle provided by an embodiment of the present disclosure Figure 5 ;

[0062] Figure 6 Flow schematic of the control method for a hybrid vehicle provided by an embodiment of the present disclosure Figure 6 ;

[0063] Figure 7 Specific fuel consumption MAP table provided by an embodiment of the present disclosure;

[0064] Figure 8 Flow schematic of the control method for a hybrid vehicle provided by an embodiment of the present disclosure Figure 7 ;

[0065] Figure 9 Relationship curve between ignition angle retard and ignition efficiency provided by an embodiment of the present disclosure;

[0066] Figure 10 Flow schematic of the control method for a hybrid vehicle provided by an embodiment of the present disclosure Figure 8 ;

[0067] Figure 11 Composition schematic diagram of the control device for a hybrid vehicle provided by an embodiment of the present disclosure. Detailed implementation manners

[0068] Hereinafter, the exemplary embodiments disclosed by the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the specific implementation manners set forth herein. On the contrary, these implementation manners are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0069] In the following description, numerous specific details are given to provide a more thorough understanding of the present disclosure. However, it will be apparent to one of ordinary skill in the art that the present disclosure can be practiced without one or more of these details. In other instances, some well-known technical features are not described in order to avoid obscuring the present disclosure; that is, not all features of the actual embodiments are described here, and the well-known functions and structures are not described in detail.

[0070] In the drawings, the same reference numerals denote the same elements throughout.

[0071] It should be understood that spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over", etc. are used herein for convenience of description to describe the relationship of one element or feature shown in the figure with other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relationship terms are also intended to include different orientations of the device in use and operation. For example, if the device in the drawing is flipped, then an element or feature described as "under other elements" or "beneath them" or "under it" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial description terms used herein are accordingly interpreted.

[0072] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present disclosure. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, identify the presence of the stated features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. As used herein, the term "and / or" includes any and all combinations of the related listed items.

[0073] Hybrid vehicles combine the advantages of fuel vehicles and pure electric vehicles and have become the most promising models in terms of industrialization and marketization. Hybrid vehicles include multiple driving modes. Since the price of electric energy required for 100 km is lower than that of fuel, hybrid vehicles will preferentially adopt the pure electric driving mode in the default mode. When the remaining power of the power battery drops to a preset lower limit, the engine will intervene and enter the electric balance mode. However, for driving scenarios with fixed routes where the power cannot be replenished in time, how to improve the comprehensive driving range of hybrid vehicles and improve the situation where the comprehensive driving range of hybrid vehicles is shortened when using the pure electric driving mode under high-speed conditions has become an urgent problem to be solved at present.

[0074] In some embodiments, in order to increase the comprehensive cruising range of a hybrid vehicle, a fuel priority mode is provided for the driver to select without considering the price factors of fuel and electric energy. In the fuel priority mode, even when the remaining power of the power battery is relatively sufficient, the engine can be allowed to start and intervene when the hybrid vehicle is in a suitable working condition. Especially in the high-speed working condition, the direct drive mode of the engine is allowed, the direct drive clutch of the hybrid box is closed, and the engine is directly connected to the transmission. The torque output by the engine can be directly transmitted to the wheel ends. Thus, both the fuel utilization rate can be increased, and the problem of increased power loss of the power battery caused by using the pure electric drive mode in the high-speed working condition can be avoided, thereby improving the comprehensive cruising range of the hybrid vehicle.

[0075] Since the actual working conditions are relatively complex, a reasonable method needs to be adopted to judge the switching timing of the drive mode in order to fully utilize the advantage of the fuel priority mode in improving the comprehensive cruising range of the hybrid vehicle. In this regard, the present disclosure proposes the following embodiments.

[0076] The present disclosure provides a control method for a hybrid vehicle, Figure 1 which is a schematic flow chart of the control method for the hybrid vehicle provided by the embodiments of the present disclosure. As Figure 1 shown, the control method for the hybrid vehicle includes the following steps:

[0077] Step S10: Obtain the operating parameters of the hybrid vehicle;

[0078] Step S20: Based on the operating parameters of the hybrid vehicle, determine whether the hybrid vehicle meets the drive mode switching condition;

[0079] Step S30: When it is determined that the hybrid vehicle meets the drive mode switching condition, calculate the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle;

[0080] Step S40: Based on the current drive mode of the hybrid vehicle, the operating efficiency of the pure electric drive mode, and the operating efficiency of the engine direct drive mode, determine the drive mode adjustment strategy of the hybrid vehicle.

[0081] In an embodiment of the present disclosure, a hybrid vehicle may include: a vehicle control unit (VCU), an electronic stability controller (ESC), a drive motor, a motor control unit (MCU) coupled to the drive motor, an engine, an engine control unit (ECU) coupled to the engine, a generator, a generator control unit (GCU) coupled to the generator, a power battery, a battery management system (BMS) coupled to the power battery, a wheel drive shaft, a direct drive clutch located between the engine and the wheel drive shaft, etc. Among them, the VCU may be configured to execute the control method of the hybrid vehicle provided in the embodiment of the present disclosure.

[0082] In some embodiments, the specific process of executing step S10 may include: obtaining operating parameters of the hybrid vehicle such as the remaining power of the power battery, the vehicle speed of the hybrid vehicle, the throttle pedal opening, the bus voltage, the actual ignition angle retard, etc.

[0083] In some embodiments, the specific process of executing step S20 may include: determining whether the hybrid vehicle is in a driving high-voltage state and determining whether the remaining power of the power battery is within a preset range; when the hybrid vehicle is in a driving high-voltage state and the remaining power of the power battery is within the preset range, determining whether the hybrid vehicle is in a fuel priority mode; when the hybrid vehicle is in a fuel priority mode, determining whether the vehicle speed of the hybrid vehicle is higher than a preset vehicle speed; when the vehicle speed of the hybrid vehicle is higher than the preset vehicle speed, determining that the hybrid vehicle meets the drive mode switching condition.

[0084] In some embodiments, Figure 2 For the flow diagram of executing steps S10 and S20, with reference to Figure 1 and Figure 2, the specific processes of executing step S10 and step S20 may include: step S101, obtaining the SOC of the power battery from the BMS and obtaining the internal state of the VCU; step S201, determining whether the hybrid vehicle is in the driving high-voltage state and determining whether the SOC of the power battery is within a preset range. Here, taking the preset range as [25%, 85%] as an example; step S102, obtaining the fuel priority signal MP5_b_Fuel_Prio from the in-vehicle MP5; step S202, determining whether the fuel priority signal MP5_b_Fuel_Prio is set to 1. Here, the fuel priority signal MP5_b_Fuel_Prio being 1 represents that the driver selects the fuel priority mode; step S103, obtaining the vehicle speed ESC_v_spd of the hybrid vehicle from the ESC; step S203, determining whether the vehicle speed ESC_v_spd of the hybrid vehicle is higher than the preset vehicle speed. Here, taking the preset vehicle speed as 70 km / h as an example; step S204, when the vehicle speed of the hybrid vehicle is higher than the preset vehicle speed, determining that the hybrid vehicle meets the drive mode switching condition.

[0085] In the embodiment of the present disclosure, when the SOC of the power battery is within the preset range, the driver selects the fuel mode, and the vehicle speed exceeds the preset vehicle speed, the hybrid vehicle meets the drive mode switching condition, that is, the hybrid vehicle meets the basic conditions for adopting the engine direct drive mode. At this time, it is necessary to further determine the switching timing of the drive mode to more accurately determine the intervention timing of the engine according to the current driving state of the hybrid vehicle, so as to achieve the effect of improving the comprehensive cruising range of the hybrid vehicle.

[0086] In some embodiments, Figure 3 For the flow chart of executing step S30, with reference to Figure 1 and Figure 3 , the specific process of executing step S30 may include: step S301, querying the throttle pedal MAP table to obtain the wheel-side torque corresponding to the vehicle speed and the throttle pedal opening; step S302, calculating the driving efficiency of the drive motor based on the operating parameters of the hybrid vehicle; step S303, calculating the discharge efficiency of the power battery based on the operating parameters of the hybrid vehicle and the driving efficiency of the drive motor; step S304, multiplying the driving efficiency of the drive motor and the discharge efficiency of the power battery to obtain the operating efficiency of the pure electric drive mode; step S305, calculating the fuel efficiency of the engine based on the operating parameters of the hybrid vehicle; step S306, calculating the ignition efficiency of the engine based on the operating parameters of the hybrid vehicle; step S307, multiplying the fuel efficiency and the ignition efficiency of the engine to obtain the operating efficiency of the engine direct drive mode.

[0087] In some specific examples, the specific process of performing step S301 may include: querying the throttle pedal MAP table according to the vehicle speed ESC_v_spd and the throttle pedal opening to obtain the wheel side torque VCM_m_torq corresponding to the vehicle speed ESC_v_spd and the throttle pedal opening.

[0088] It should be noted that in the embodiments of the present disclosure, the throttle pedal MAP table includes the corresponding relationship among the vehicle speed, the throttle pedal opening, and the wheel side torque. Querying the throttle pedal MAP table according to the known vehicle speed and throttle pedal opening can obtain the corresponding wheel side torque. The throttle pedal MAP table can be generated during the test stage of the hybrid vehicle and corrected during the working stage of the hybrid vehicle.

[0089] In some embodiments, Figure 4 is a schematic flowchart for performing step S302. With reference to Figure 3 and Figure 4 , based on the operating parameters of the hybrid vehicle, calculate the driving efficiency of the drive motor, including: step S3021, calculate the rotational speed MCU_n_spd of the drive motor according to the vehicle speed ESC_v_spd, the first gear ratio G1, and the tire diameter D of the hybrid vehicle; the first gear ratio G1 is the gear ratio between the drive motor and the wheel drive shaft; step S3022, calculate the torque MCU_m_torq of the drive motor according to the wheel side torque VCM_m_torq and the first gear ratio G1; step S3023, query the first drive efficiency MAP table of the drive motor corresponding to the first calibrated voltage U1 to obtain the first drive efficiency q1 corresponding to the rotational speed MCU_n_spd and the torque MCU_m_torq of the drive motor; query the second drive efficiency MAP table of the drive motor corresponding to the second calibrated voltage U2 to obtain the second drive efficiency q2 corresponding to the rotational speed MCU_n_spd and the torque MCU_m_torq of the drive motor; step S2034, perform linear interpolation on the first drive efficiency q1 and the second drive efficiency q2 according to the bus voltage U to obtain the drive efficiency q3 of the drive motor.

[0090] It should be noted that in the embodiments of the present disclosure, the drive efficiency MAP table of the drive motor includes the corresponding relationship among the rotational speed of the drive motor, the torque of the drive motor, and the drive efficiency. By querying the drive efficiency MAP table based on the known rotational speed and torque of the drive motor, the corresponding drive efficiency can be obtained. Each drive efficiency MAP table corresponds to a bus voltage. During the test phase of the hybrid vehicle, multiple drive efficiency MAP tables can be obtained based on multiple different calibration voltages. During the operation phase of the hybrid vehicle, two adjacent drive efficiency MAP tables can be queried according to the current rotational speed and torque of the drive motor, and linear interpolation is performed on the two queried drive efficiencies according to the current bus voltage, so that the current drive efficiency can be calculated.

[0091] In some specific examples, the rotational speed MCU_n_spd of the drive motor can be calculated according to the following formula (1).

[0092] MCU_n_spd = ESC_v_spd·1000·G1 / 60π·D (1)

[0093] In formula (1), the unit of the tire diameter D is meters (m), the unit of the rotational speed MCU_n_spd of the drive motor is revolutions per minute (r / min), and the unit of the vehicle speed ESC_v_spd is kilometers per hour (km / h).

[0094] In some specific examples, the torque MCU_m_torq of the drive motor can be calculated according to the following formula (2).

[0095] MCU_m_torq = VCM_m_torq / G1 (2)

[0096] In formula (2), the units of the wheel-side torque VCM_m_torq and the torque MCU_m_torq of the drive motor are both Newton-meters (Nm).

[0097] In some specific examples, linear interpolation can be performed on the first drive efficiency q1 and the second drive efficiency q2 based on the following formula (3) and formula (4) according to the bus voltage U.

[0098] q3 = a·q1 + (1 - a)·q2 (3)

[0099] a = (U - U2) / (U1 - U2) (4)

[0100] Here, the first calibration voltage U1 and the second calibration voltage U2 can be two adjacent calibration voltages, where the first calibration voltage U1 is higher than the bus voltage U, and the second calibration voltage U2 is lower than the bus voltage U.

[0101] In some embodiments, Figure 5It is a schematic flow diagram for executing step S303. With reference to Figure 3 and Figure 5 , based on the operating parameters of the hybrid vehicle and the driving efficiency of the drive motor, calculate the discharge efficiency of the power battery, including: Step S3031, calculate the required power BMS_p_out of the drive motor according to the rotational speed MCU_n_spd of the drive motor, the torque MCU_m_torq of the drive motor, and the driving efficiency q3 of the drive motor; Step S3032, calculate the discharge current BMS_I_target of the power battery according to the required power BMS_p_out of the drive motor and the bus voltage U; Step S3033, calculate the discharge loss power BMS_p_loss of the power battery according to the discharge current BMS_I_target of the power battery and the internal resistance BMS_R_intel of the power battery; Step S3034, calculate the discharge efficiency of the power battery according to the required power BMS_p_out and the discharge loss power BMS_p_loss of the power battery.

[0102] In some specific examples, the required power BMS_p_out of the drive motor can be calculated according to the following formula (5).

[0103] BMS_p_out = MCU_n_spd · MCU_m_torq / 9550 / q3 (5)

[0104] In formula (5), the unit of the required power BMS_p_out is kilowatt (kW), the unit of the rotational speed MCU_n_spd of the drive motor is revolutions per minute (r / min), and the unit of the torque MCU_m_torq of the drive motor is Newton-meter (Nm).

[0105] In some specific examples, the discharge current BMS_I_target of the power battery can be calculated according to the following formula (6).

[0106] BMS_I_target = BMS_p_out / U (6)

[0107] In formula (6), the unit of the discharge current BMS_I_target is milliampere (mA), and the unit of the bus voltage U is volt (V).

[0108] In some specific examples, the discharge loss power BMS_p_loss of the power battery can be calculated according to the following formula (7).

[0109] BMS_p_loss = 1000 · BMS_I_target · BMS_I_target · BMS_R_intel (7)

[0110] In formula (7), the unit of the discharge loss power BMS_p_loss is kilowatt (kW), the unit of the discharge current BMS_I_target is milliampere (mA), and the unit of the internal resistance BMS_R_intel of the power battery is ohm (Ω).

[0111] In the embodiments of the present disclosure, the discharge loss of the power battery only considers the heating power caused by the internal resistance of the power battery.

[0112] In some specific examples, the discharge efficiency q4 of the power battery can be calculated according to the following formula (8).

[0113] q4 = BMS_p_out / (BMS_p_out + BMS_p_loss) (8)

[0114] In some specific examples, the operating efficiency Qe of the pure electric drive mode can be calculated according to the following formula (9).

[0115] Qe = q3 · q4 (9)

[0116] In the embodiments of the present disclosure, based on the current operating parameters of the hybrid vehicle, the drive efficiency of the drive motor and the discharge efficiency of the power battery can be obtained through calculation, and the operating efficiency of the pure electric drive mode can be obtained by multiplying the drive efficiency of the drive motor and the discharge efficiency of the power battery.

[0117] In some embodiments, Figure 6 For the process flow diagram of executing step S305, with reference to Figure 3 and Figure 6 , based on the operating parameters of the hybrid vehicle, calculate the fuel efficiency of the engine, including: step S3051, calculate the engine speed ECU_n_spd according to the vehicle speed ESC_v_spd, the second gear ratio G2, and the tire diameter D; the second gear ratio G2 is the gear ratio between the engine and the wheel drive shaft; step S3052, calculate the engine torque ECU_m_torq according to the wheel torque VCM_m_torq and the second gear ratio G2; step S3053, query the specific fuel consumption MAP table of the engine to obtain the specific fuel consumption value ge corresponding to the engine speed ECU_n_spd and the engine torque ECU_m_torq; step S3054, calculate the fuel efficiency K1 of the engine according to the specific fuel consumption value ge and the optimal specific fuel consumption value in the specific fuel consumption MAP table.

[0118] In some specific examples, the engine speed ECU_n_spd can be calculated by the following formula (10).

[0119] ECU_n_spd = ESC_v_spd · 1000 · G2 / 60π · D (10)

[0120] In formula (10), the unit of the tire diameter D is meter (m), the unit of the engine speed ECU_n_spd is revolutions per minute (r / min), and the unit of the vehicle speed ESC_v_spd is kilometers per hour (km / h).

[0121] In some specific examples, the engine torque ECU_m_torq can be calculated by the following formula (11).

[0122] ECU_m_torq = VCM_m_torq / G2 (11)

[0123] In formula (11), the units of the wheel-end torque VCM_m_torq and the engine torque ECU_m_torq are both Newton-meter (Nm).

[0124] In some specific examples, Figure 7 For the specific fuel consumption MAP table, the specific fuel consumption MAP table includes the corresponding relationship among the engine speed, the engine torque, and the specific fuel consumption value. The lowest point in the figure is the optimal specific fuel consumption value. Here, the optimal specific fuel consumption value is 205 g / kWh. After querying the specific fuel consumption MAP table, the engine fuel efficiency K1 can be calculated by the following formula (12), and the specific fuel consumption value ge is the specific fuel consumption value corresponding to the engine speed ECU_n_spd and the engine torque ECU_m_torq in this specific fuel consumption MAP table.

[0125] K1 = 1 - [(ge - 205) / 205] (12)

[0126] In some embodiments, Figure 8 is the flow diagram for executing step S306. With reference to Figure 3 and Figure 8 , based on the operating parameters of the hybrid vehicle, calculate the ignition efficiency of the engine, including: step S3061, query the relationship curve between the ignition angle retard and the ignition efficiency to obtain the first ignition efficiency £ corresponding to the actual ignition angle retard; step S3062, calculate the ignition efficiency K2 of the engine according to the first ignition efficiency £ and the second ignition efficiency £0 measured in the bench test.

[0127] In some specific examples, Figure 9 is the relationship curve between the ignition angle retard and the ignition efficiency, which is a curve fitted based on the global combustion efficiency. After querying this relationship curve according to the actual ignition angle retard, the ignition efficiency K2 of the engine can be calculated by the following formula (13), and the first ignition efficiency £ is the ignition efficiency corresponding to the actual ignition angle retard of the hybrid vehicle in this relationship curve.

[0128] K2 = £ / £0 (13)

[0129] In some specific examples, the operating efficiency Ke of the engine direct drive mode can be calculated by the following formula (14).

[0130] Ke = K1·K2(14)

[0131] In the embodiments of the present disclosure, based on the current operating parameters of the hybrid vehicle, the fuel efficiency and ignition efficiency of the engine can be calculated, and the operating efficiency of the engine direct drive mode can be obtained by multiplying the fuel efficiency and the ignition efficiency.

[0132] In some embodiments, Figure 10 is a schematic flow chart for executing step S40. With reference to Figure 1 、 Figure 2 and Figure 10 , after steps S304 and S307, that is, after calculating the operating efficiency Qe of the pure electric drive mode and the operating efficiency Ke of the engine direct drive mode based on the operating parameters of the hybrid vehicle, the specific process of executing step S40 includes: step S401, calculating the ratio of the operating efficiency of the engine direct drive mode to the operating efficiency of the pure electric drive mode and obtaining the current drive mode; step S402, determining whether the current drive mode is the pure electric drive mode. Here, if the current drive mode is not the pure electric drive mode, it is the engine direct drive mode; step S403, when the current drive mode of the hybrid vehicle is the pure electric drive mode, comparing the ratio with a first preset ratio, and the first preset ratio is greater than 1; step S404, when the ratio is greater than the first preset ratio and the duration exceeds the first preset time, determining to switch the drive mode of the hybrid vehicle from the pure electric drive mode to the engine direct drive mode; step S405, when the current drive mode of the hybrid vehicle is the engine direct drive mode, comparing the ratio with a second preset ratio, and the second preset ratio is less than 1; step S406, when the ratio is less than the second preset ratio and the duration exceeds the second preset time, determining to switch the drive mode of the hybrid vehicle from the engine direct drive mode to the pure electric drive mode.

[0133] In some specific examples, the ratio of the operating efficiency Ke of the engine direct drive mode to the pure electric drive mode Qe can be calculated by the following formula (15).

[0134] K_cmp = Ke / Qe(15)

[0135] In some specific examples, the first preset ratio can be 1.05, and the first preset time can be 1 s. That is, when the ratio K_cmp is greater than 1.05 and the duration exceeds 1 s, it can be determined that based on the current operating parameters of the hybrid vehicle, the operating efficiency of the engine direct drive mode is higher than that of the pure electric drive mode. Therefore, the drive mode of the hybrid vehicle can be switched from the pure electric drive mode to the engine direct drive mode.

[0136] In some specific examples, the second preset ratio can be 0.95, and the second preset time can be 0.5 s. That is, when the ratio K_cmp is less than 0.95 and the duration exceeds 0.5 s, it can be determined that based on the current operating parameters of the hybrid vehicle, the operating efficiency of the pure electric drive mode is higher than that of the engine direct drive mode. Therefore, the drive mode of the hybrid vehicle can be switched from the engine direct drive mode to the pure electric drive mode.

[0137] In some embodiments, the control method of the hybrid vehicle further includes: when it is determined to switch the drive mode of the hybrid vehicle from the pure electric drive mode to the engine direct drive mode, starting the engine and engaging the direct drive clutch. In addition, the calculated torque ECU_m_torq of the engine can be sent to the ECU for the ECU to perform torque control.

[0138] In some embodiments, the control method of the hybrid vehicle further includes: when it is determined to switch the drive mode of the hybrid vehicle from the engine direct drive mode to the pure electric drive mode, shutting down the engine and disengaging the direct drive clutch. In addition, the calculated torque MCU_m_torq of the drive motor can be sent to the MCU for the MCU to perform torque control.

[0139] In the embodiments of the present disclosure, after calculating the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle, the adjustment strategy of the drive mode can be determined based on the current drive mode of the hybrid vehicle and the ratio of the operating efficiency of the engine direct drive mode to the operating efficiency of the pure electric drive mode, so as to timely switch the drive mode of the hybrid vehicle to the drive mode with higher operating efficiency, thereby improving the comprehensive cruising range of the hybrid vehicle in the fuel priority mode.

[0140] Based on a concept similar to the above control method of the hybrid vehicle, the present disclosure also provides a control device for a hybrid vehicle. Figure 11 It is a schematic diagram of the composition of the control device 500 for the hybrid vehicle, as Figure 11 shown, the control device 500 of the hybrid vehicle includes the following modules.

[0141] An acquisition module 501, configured to: acquire the operating parameters of the hybrid vehicle.

[0142] A first determination module 502, configured to: determine whether the hybrid vehicle meets the drive mode switching condition based on the operating parameters of the hybrid vehicle.

[0143] In some specific examples, the acquisition module 501 and the first determination module 502 can also be configured to execute Figure 2 the steps in.

[0144] The operating efficiency calculation module 503 is configured to: when it is determined that the hybrid vehicle meets the drive mode switching condition, calculate the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle. Specifically, the operating efficiency calculation module 503 can also be configured to execute Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 8 the steps in.

[0145] The second determination module 504 is configured to: determine the drive mode adjustment strategy of the hybrid vehicle based on the current drive mode of the hybrid vehicle, the operating efficiency of the pure electric drive mode, and the operating efficiency of the engine direct drive mode. Specifically, the second determination module 504 can also be configured to execute Figure 10 the steps in.

[0146] In some specific examples, the control device 500 of the hybrid vehicle provided by the present disclosure can be a VCU or a part of the VCU.

[0147] The present disclosure also provides a hybrid vehicle, including: a memory, a processor, and a program stored on the memory, and when the processor executes the program, it implements the control method of the hybrid vehicle in any of the above embodiments.

[0148] The present disclosure also provides a readable storage medium, on which a program is stored, and when the processor executes the program, it implements the control method of the hybrid vehicle in any of the above embodiments.

[0149] In some specific examples, the above-mentioned processor can be at least one of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor. It can be understood that other electronic devices for implementing the functions of the above-mentioned processor are also possible, and the embodiments of the present disclosure do not make specific limitations.

[0150] In some specific examples, the above storage medium / memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a ferromagnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM), etc.; it can also be various terminals including one or any combination of the above memories, such as mobile phones, computers, tablet devices, personal digital assistants, etc.

[0151] In the method embodiments disclosed in several method embodiments provided by the present disclosure, the methods can be arbitrarily combined without conflict to obtain new method embodiments.

[0152] The features disclosed in several device embodiments provided by the present disclosure can be arbitrarily combined without conflict to obtain new device embodiments.

[0153] As described above, the above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered by the protection scope of the present disclosure.

Claims

1. A control method for a hybrid vehicle, characterized in that, Including: Obtaining the operating parameters of a hybrid vehicle; Based on the operating parameters of the hybrid vehicle, determining whether the hybrid vehicle meets the drive mode switching condition; wherein, when the hybrid vehicle is in a driving high-voltage state, the remaining power of the power battery of the hybrid vehicle is within a preset range, the hybrid vehicle is in a fuel priority mode and the vehicle speed of the hybrid vehicle is higher than a preset vehicle speed, it is determined that the hybrid vehicle meets the drive mode switching condition; When it is determined that the hybrid vehicle meets the drive mode switching condition, calculating the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle; Based on the current drive mode of the hybrid vehicle, the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode, determining the drive mode adjustment strategy of the hybrid vehicle, so as to timely switch the drive mode of the hybrid vehicle to a drive mode with higher operating efficiency.

2. The control method of the hybrid vehicle according to claim 1, wherein The hybrid vehicle includes: a drive motor, the power battery, and an engine; the calculating the operating efficiency of the pure electric drive mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle includes: Calculating the drive efficiency of the drive motor based on the operating parameters of the hybrid vehicle; Calculating the discharge efficiency of the power battery based on the operating parameters of the hybrid vehicle and the drive efficiency of the drive motor; Multiplying the drive efficiency of the drive motor and the discharge efficiency of the power battery to obtain the operating efficiency of the pure electric drive mode; Calculating the fuel efficiency of the engine based on the operating parameters of the hybrid vehicle; Calculating the ignition efficiency of the engine based on the operating parameters of the hybrid vehicle; Multiplying the fuel efficiency of the engine and the ignition efficiency to obtain the operating efficiency of the engine direct drive mode.

3. The control method of the hybrid vehicle according to claim 2, wherein, The hybrid vehicle further includes: a wheel drive shaft; the operating parameters of the hybrid vehicle include: vehicle speed, accelerator pedal opening, and bus voltage; the calculating the drive efficiency of the drive motor based on the operating parameters of the hybrid vehicle includes: Querying the accelerator pedal MAP table to obtain the wheel-side torque corresponding to the vehicle speed and the accelerator pedal opening; Calculating the rotational speed of the drive motor according to the vehicle speed, the first speed ratio, and the tire diameter of the hybrid vehicle; the first speed ratio is the speed ratio between the drive motor and the wheel drive shaft; Calculating the torque of the drive motor according to the wheel-side torque and the first speed ratio; Querying the first drive efficiency MAP table of the drive motor corresponding to the first calibrated voltage to obtain the first drive efficiency corresponding to the rotational speed and the torque of the drive motor; Querying the second drive efficiency MAP table of the drive motor corresponding to the second calibrated voltage to obtain the second drive efficiency corresponding to the rotational speed and the torque of the drive motor; Performing linear interpolation on the first drive efficiency and the second drive efficiency according to the bus voltage to obtain the drive efficiency of the drive motor.

4. The control method of the hybrid vehicle according to claim 3, wherein Calculating the discharge efficiency of the power battery based on the operating parameters of the hybrid vehicle and the drive efficiency of the drive motor includes: Calculating the required power of the drive motor according to the rotational speed of the drive motor, the torque of the drive motor, and the drive efficiency of the drive motor; Calculating the discharge current of the power battery according to the required power of the drive motor and the bus voltage; Calculating the discharge loss power of the power battery according to the discharge current of the power battery and the internal resistance of the power battery; Calculating the discharge efficiency of the power battery according to the required power and the discharge loss power of the power battery.

5. The control method of the hybrid vehicle according to claim 3, characterized in that, Calculating the fuel efficiency of the engine based on the operating parameters of the hybrid vehicle includes: Calculating the rotational speed of the engine according to the vehicle speed, the second gear ratio, and the tire diameter; the second gear ratio is the gear ratio between the engine and the wheel drive shaft; Calculating the torque of the engine according to the wheel-side torque and the second gear ratio; Querying the specific fuel consumption MAP table of the engine to obtain the specific fuel consumption value corresponding to the rotational speed and the torque of the engine; Calculating the fuel efficiency of the engine according to the specific fuel consumption value and the optimal specific fuel consumption value in the specific fuel consumption MAP table.

6. The control method of the hybrid vehicle according to claim 3, characterized in that, The operating parameters of the hybrid vehicle further include: the actual ignition angle retard; calculating the ignition efficiency of the engine based on the operating parameters of the hybrid vehicle includes: Querying the relationship curve between the ignition angle retard and the ignition efficiency to obtain the first ignition efficiency corresponding to the actual ignition angle retard; Calculating the ignition efficiency of the engine according to the first ignition efficiency and the second ignition efficiency measured in the bench test.

7. The control method of the hybrid vehicle according to claim 2, characterized in that, The operating parameters of the hybrid vehicle further include: the remaining power of the power battery; determining whether the hybrid vehicle meets the drive mode switching condition includes: Determining whether the hybrid vehicle is in the driving high-voltage state and determining whether the remaining power of the power battery is within the preset range; When the hybrid vehicle is in the driving high-voltage state and the remaining power of the power battery is within the preset range, determining whether the hybrid vehicle is in the fuel priority mode; When the hybrid vehicle is in the fuel priority mode, determining whether the vehicle speed of the hybrid vehicle is higher than the preset vehicle speed; When the vehicle speed of the hybrid vehicle is higher than the preset vehicle speed, determining that the hybrid vehicle meets the drive mode switching condition.

8. The control method of a hybrid vehicle according to claim 1, wherein Determining the drive mode adjustment strategy of the hybrid vehicle based on the current drive mode of the hybrid vehicle, the operating efficiency of the pure electric drive mode, and the operating efficiency of the engine direct drive mode includes: Calculating the ratio of the operating efficiency of the engine direct drive mode to the operating efficiency of the pure electric drive mode; When the current driving mode of the hybrid vehicle is the pure electric driving mode, compare the ratio with a first preset ratio. When the ratio is greater than the first preset ratio and the duration exceeds a first preset time, determine to switch the driving mode of the hybrid vehicle from the pure electric driving mode to the engine direct drive mode; the first preset ratio is greater than 1. When the current driving mode of the hybrid vehicle is the engine direct drive mode, compare the ratio with a second preset ratio. When the ratio is less than the second preset ratio and the duration exceeds a second preset time, determine to switch the driving mode of the hybrid vehicle from the engine direct drive mode to the pure electric driving mode; the second preset ratio is less than 1.

9. The control method of the hybrid vehicle according to claim 8, wherein The hybrid vehicle further includes: a direct drive clutch located between the engine and the wheel drive shaft of the hybrid vehicle; the control method of the hybrid vehicle further includes: When it is determined to switch the driving mode of the hybrid vehicle from the pure electric driving mode to the engine direct drive mode, start the engine and engage the direct drive clutch. When it is determined to switch the driving mode of the hybrid vehicle from the engine direct drive mode to the pure electric driving mode, turn off the engine and disengage the direct drive clutch.

10. A control device for a hybrid vehicle, characterized in that, Comprising: An acquisition module configured to: acquire the operating parameters of the hybrid vehicle. A first determination module configured to: based on the operating parameters of the hybrid vehicle, determine whether the hybrid vehicle meets the driving mode switching condition; wherein, when the hybrid vehicle is in the driving high voltage state, the remaining power of the power battery of the hybrid vehicle is within a preset range, the hybrid vehicle is in the fuel priority mode and the vehicle speed of the hybrid vehicle is higher than a preset vehicle speed, it is determined that the hybrid vehicle meets the driving mode switching condition. An operating efficiency calculation module configured to: when it is determined that the hybrid vehicle meets the driving mode switching condition, calculate the operating efficiency of the pure electric driving mode and the operating efficiency of the engine direct drive mode based on the operating parameters of the hybrid vehicle. A second determination module configured to: based on the current driving mode of the hybrid vehicle, the operating efficiency of the pure electric driving mode and the operating efficiency of the engine direct drive mode, determine the driving mode adjustment strategy of the hybrid vehicle, so as to timely switch the driving mode of the hybrid vehicle to the driving mode with higher operating efficiency.

11. A hybrid vehicle, characterized in that, Comprising: A memory, a processor, and a program stored on the memory, and when the processor executes the program, it implements the control method of the hybrid vehicle according to any one of claims 1 to 9.

12. A readable storage medium, characterized in that, A program is stored on the readable storage medium, and when the processor executes the program, it implements the control method of the hybrid vehicle according to any one of claims 1 to 9.

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