Control method, device and equipment for direct drive mode of hybrid vehicle and medium

Abstract

The invention provides a control method, device and equipment for a direct drive mode of a hybrid vehicle and a medium, and the method comprises the steps: judging whether the current residual electric quantity of a power battery of the hybrid vehicle is greater than or equal to an electric quantity threshold value or not when it is detected that the hybrid vehicle is running on a long downhill road; the recovery current power of the power battery is smaller than a first preset power threshold value; if yes, a generator, an engine and a driving motor of the hybrid vehicle are controlled, so that the hybrid vehicle enters a direct drive mode, and the hybrid vehicle is braked through braking force generated by internal resistance of the engine. According to the method and the device, the braking force generated by the internal resistance of the engine is fully utilized to brake the hybrid vehicle, and the mechanical braking force of the hybrid vehicle under the long downhill condition is reduced, so that the abrasion of a mechanical braking system of the hybrid vehicle is reduced, and the service life of the mechanical braking system is prolonged.

Description

Technical Field

[0001] The present application relates to the field of automobile control technology, and in particular to a control method, device, equipment and medium for a direct drive mode of a hybrid vehicle. Background Art

[0002] When a hybrid vehicle is driving for a long time on a long downhill road, the vehicle's power battery is always in a high-power state due to the energy recovery of the drive motor. The vehicle can only work in pure electric mode and cannot use the drive motor's recovery force for electric braking. It can only be completely mechanically braked by the braking system. Moreover, the engine of a hybrid vehicle is usually in a shutdown state when the battery is high. On a long downhill road, there is no internal resistance braking force of the engine, and it can only rely on the braking system to provide mechanical braking.

[0003] However, this situation will require the braking system to provide more mechanical braking force under the same braking demand, which will cause severe wear of the brake friction pads and shorten the life of the mechanical braking system, and may even cause thermal runaway of the vehicle's mechanical braking system and cause traffic accidents. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a control method, device, equipment and medium for the direct drive mode of a hybrid vehicle, which fully utilizes the braking force generated by the internal resistance of the engine to brake the hybrid vehicle, reduces the mechanical braking force of the hybrid vehicle in long downhill conditions, thereby reducing the wear of the mechanical braking system of the hybrid vehicle and increasing the service life of the mechanical braking system.

[0005] In a first aspect, an embodiment of the present application provides a control method for a direct drive mode of a hybrid vehicle, the control method comprising:

[0006] When it is detected that the hybrid vehicle is traveling on a long downhill road, determining whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to a power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold;

[0007] If so, the generator, the engine and the drive motor of the hybrid vehicle are controlled to make the hybrid vehicle enter a direct drive mode, so as to brake the hybrid vehicle by utilizing the braking force generated by the internal resistance of the engine.

[0008] Furthermore, whether the hybrid vehicle is traveling on a long downhill road is determined by the following steps:

[0009] Determining whether the slope of the road on which the hybrid vehicle is currently traveling is greater than a preset slope threshold, whether the current speed of the hybrid vehicle is greater than a speed threshold, whether the number of times the duration of the brake pedal of the hybrid vehicle being depressed is greater than a first preset time threshold is greater than a first number threshold, and whether the number of times the duration of the throttle opening of the hybrid vehicle being greater than the first preset opening threshold is greater than a second preset time threshold is greater than a second number threshold;

[0010] If both are yes, it is considered that the hybrid vehicle is traveling on a long downhill road.

[0011] Furthermore, controlling the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters a direct drive mode includes:

[0012] Controlling the power generation of the generator to reach a preset power value;

[0013] controlling the driving torque of the engine to reach the minimum torque of the engine;

[0014] The power of the driving motor is controlled to reach the energy recovery power; wherein the energy recovery power is the sum of the DCDC power of the hybrid vehicle, the power of the passenger compartment air conditioning system, and the power of the cooling and heating system of the power battery.

[0015] Furthermore, after controlling the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters the direct drive mode, the control method further includes:

[0016] When it is detected that the hybrid vehicle meets any predetermined condition, the hybrid vehicle is controlled to exit the direct drive mode.

[0017] Furthermore, the predetermined conditions include that the duration of the slope of the road on which the hybrid vehicle is currently traveling being less than a preset slope threshold reaches a third preset time threshold, the current remaining power of the power battery of the hybrid vehicle is less than or equal to a power threshold, the recovery current power of the power battery is greater than a second preset power threshold, and the duration of the throttle opening of the hybrid vehicle being greater than the second preset opening threshold is greater than a fourth preset time threshold and is greater than or equal to a third number threshold.

[0018] Further, controlling the hybrid vehicle to exit the direct drive mode includes:

[0019] Controlling the engine to stop working, and controlling the torque of the engine to reach a preset torque;

[0020] Controlling the generator to stop working;

[0021] The torque of the driving motor is controlled to reach the driving demand torque.

[0022] In a second aspect, an embodiment of the present application further provides a control device for a direct drive mode of a hybrid vehicle, the control device comprising:

[0023] a judgment module, configured to judge whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to a power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold, when it is detected that the hybrid vehicle is traveling on a long downhill road;

[0024] The first control module is used to control the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters a direct drive mode, so as to brake the hybrid vehicle using the braking force generated by the internal resistance of the engine.

[0025] Furthermore, the judgment module is further configured to judge whether the hybrid vehicle is traveling on a long downhill road by the following steps:

[0026] Determining whether the slope of the road on which the hybrid vehicle is currently traveling is greater than a preset slope threshold, whether the current speed of the hybrid vehicle is greater than a speed threshold, whether the number of times the duration of the brake pedal of the hybrid vehicle being depressed is greater than a first preset time threshold is greater than a first number threshold, and whether the number of times the duration of the throttle opening of the hybrid vehicle being greater than the first preset opening threshold is greater than a second preset time threshold is greater than a second number threshold;

[0027] If both are yes, it is considered that the hybrid vehicle is traveling on a long downhill road.

[0028] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate via the bus, and when the machine-readable instructions are executed by the processor, the steps of the control method of the direct drive mode of the hybrid vehicle as described above are performed.

[0029] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the control method of the direct drive mode of a hybrid vehicle as described above are executed.

[0030] The embodiments of the present application provide a control method, device, equipment and medium for a direct drive mode of a hybrid vehicle. First, when it is detected that the hybrid vehicle is traveling on a long downhill road, it is determined whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to a power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold; if so, the generator, engine and drive motor of the hybrid vehicle are controlled to make the hybrid vehicle enter the direct drive mode, so as to use the braking force generated by the internal resistance of the engine to brake the hybrid vehicle.

[0031] When the hybrid vehicle is in a high SOC state and traveling on a long downhill road, the present application controls the generator, the engine and the drive motor to control the hybrid vehicle to enter the direct drive mode, and fully utilizes the braking force generated by the internal resistance of the engine to brake the hybrid vehicle, thereby reducing the mechanical braking force of the hybrid vehicle in the long downhill situation, thereby reducing the wear of the mechanical braking system of the hybrid vehicle, increasing the service life of the mechanical braking system, and also avoiding traffic accidents caused by thermal failure of the braking system due to long-term continuous braking of the hybrid vehicle on a long downhill road.

[0032] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A flow chart of a control method for a hybrid vehicle direct drive mode provided in an embodiment of the present application;

[0035] Figure 2 One of the structural schematic diagrams of a control device for a direct drive mode of a hybrid vehicle provided in an embodiment of the present application;

[0036] Figure 3 A second structural schematic diagram of a control device for a direct drive mode of a hybrid vehicle provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0039] First, the application scenarios to which the present application is applicable are introduced. The present application can be applied in the field of automobile control technology.

[0040] When a hybrid vehicle is driving for a long time on a long downhill road, the vehicle's power battery is always in a high-power state due to the energy recovery of the drive motor. The vehicle can only work in pure electric mode and cannot use the drive motor's recovery force for electric braking. It can only be completely mechanically braked by the braking system. Moreover, the engine of a hybrid vehicle is usually in a shutdown state when the battery is high. On a long downhill road, there is no internal resistance braking force of the engine, and it can only rely on the braking system to provide mechanical braking.

[0041] However, research has found that this situation will require the braking system to provide more mechanical braking force under the same braking demand, which will cause severe wear of the brake friction pads and shorten the life of the mechanical braking system, and may even cause thermal runaway of the vehicle's mechanical braking system and cause traffic accidents.

[0042] Based on this, an embodiment of the present application provides a control method for the direct drive mode of a hybrid vehicle, which fully utilizes the braking force generated by the internal resistance of the engine to brake the hybrid vehicle, reducing the mechanical braking force of the hybrid vehicle in long downhill conditions, thereby reducing the wear of the mechanical braking system of the hybrid vehicle and increasing the service life of the mechanical braking system.

[0043] See also Figure 1 , Figure 1 This is a flow chart of a control method for a hybrid vehicle direct drive mode provided by an embodiment of the present application. Figure 1 As shown in , the control method provided by the embodiment of the present application includes:

[0044] S101, when it is detected that the hybrid vehicle is traveling on a long downhill road, determining whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to a power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold.

[0045] Here, the power threshold may be set to 90%, and the first preset power threshold may be set to 20KW.

[0046] Regarding the above step S101, in a specific implementation, when it is detected that the hybrid vehicle is traveling on a long downhill road, it is determined whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to the power threshold, and whether the recovery current power of the power battery is less than the first preset power threshold.

[0047] Specifically, with respect to the above step S101, the following steps are performed to determine whether the hybrid vehicle is traveling on a long downhill road:

[0048] It is determined whether the slope of the road on which the hybrid vehicle is currently traveling is greater than a preset slope threshold, whether the current speed of the hybrid vehicle is greater than a speed threshold, whether the number of times the brake pedal of the hybrid vehicle is depressed for a duration greater than a first preset time threshold is greater than a first number threshold, and whether the number of times the throttle opening of the hybrid vehicle is greater than the first preset opening threshold for a duration greater than a second preset time threshold is greater than a second number threshold; if all of the above are true, it is considered that the hybrid vehicle is traveling on a long downhill road.

[0049] For the above two steps, when implemented specifically, it is determined whether the hybrid vehicle is traveling on a long downhill road by the slope of the road on which the vehicle is traveling, the vehicle speed, the brake pedal, and the accelerator pedal. Specifically, it is determined whether the slope of the road on which the hybrid vehicle is currently traveling is greater than a preset slope threshold, where the preset slope threshold can be preset to 1. It is determined whether the current speed of the hybrid vehicle is greater than a speed threshold, where the speed threshold can be preset to 40 km / h. It is determined whether the number of times the hybrid vehicle's brake pedal is pressed for a duration greater than a first preset time threshold is greater than a first count threshold. Here, as an example, when the first preset time threshold is set to 10 seconds and the first count threshold is set to 5 times, that is, it is determined whether the number of times the hybrid vehicle's brake pedal is pressed for a duration greater than 10 seconds is greater than 5 times. It is determined whether the number of times the hybrid vehicle's throttle opening is greater than the first preset opening threshold is greater than the second preset time threshold is greater than the second count threshold. Here, as an example, when the first preset opening threshold is set to 20%, the second preset time threshold is set to 2 seconds, and the second number threshold is set to 2 times, that is, it is determined whether the number of times that the throttle opening of the hybrid vehicle is greater than 20% and the duration is greater than 2 seconds is greater than 2 times. When all of the above four judgment conditions are yes, it is considered that the hybrid vehicle is traveling on a long downhill road.

[0050] S102: If yes, the generator, the engine and the drive motor of the hybrid vehicle are controlled to make the hybrid vehicle enter a direct drive mode, so as to brake the hybrid vehicle by utilizing the braking force generated by the internal resistance of the engine.

[0051] With respect to the above step S102, in the specific implementation, when it is determined that the current remaining power of the power battery is greater than or equal to the power threshold, and the recovery current power of the power battery is less than the first preset power threshold, it means that the hybrid vehicle is in a high SOC and in a pure electric mode. Energy recovery is prohibited at a high SOC, and the power battery is not allowed to have a charging current. At this time, the hybrid vehicle has no electric braking force. If the mechanical braking is provided by the braking system alone, the brake friction pad will be severely worn. Therefore, in the above step S102, the generator, engine and drive motor of the hybrid vehicle are controlled to make the hybrid vehicle enter the direct drive mode, so as to use the braking force generated by the internal resistance of the engine to brake the hybrid vehicle. In this way, the braking force generated by the internal resistance of the engine can be fully utilized, and the mechanical braking force of the hybrid vehicle on a long downhill slope can be reduced, thereby reducing the wear of the mechanical brake.

[0052] Specifically, with respect to the above step S102, controlling the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters the direct drive mode includes:

[0053] The power generation power of the generator is controlled to reach a preset power value; the driving torque of the engine is controlled to reach a minimum torque of the engine; and the power of the driving motor is controlled to reach an energy recovery power.

[0054] Among them, the energy recovery power is the sum of the DCDC power of the hybrid vehicle, the passenger compartment air conditioning system power and the cooling and heating system power of the power battery, and the preset power value is 0KW.

[0055] For the above three steps, in the specific implementation, when controlling the hybrid vehicle to enter the direct drive mode, the power generation of the generator is controlled to reach the preset power value, that is, the power generation of the generator is controlled to reach 0KW, and the driving torque of the engine is controlled to reach the minimum torque of the engine. The power of the drive motor is controlled to reach the energy recovery power, and the energy recovery power of the drive motor is the sum of the DCDC power, the passenger compartment air conditioning system power, and the power of the power battery cooling and heating system power. In this way, the energy recovery power of the drive motor is calculated based on the power consumption of the high-voltage accessories of the whole vehicle, and the power generated by the drive motor is absorbed by the working accessories, which can not only meet the energy recovery of the battery in the high SOC segment, but also provide electric braking force for the hybrid vehicle.

[0056] As an optional embodiment, after controlling the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters the direct drive mode, the control method further includes:

[0057] When it is detected that the hybrid vehicle meets any predetermined condition, the hybrid vehicle is controlled to exit the direct drive mode.

[0058] Specifically, the predetermined condition includes that the duration of the slope of the road on which the hybrid vehicle is currently traveling is less than the preset slope threshold reaches a third preset time threshold. Here, as an example, when the preset slope threshold is 1 and the third preset time threshold is 5 seconds, the predetermined condition is that the duration of the slope of the road on which the hybrid vehicle is currently traveling is less than 1 reaches 5 seconds. The predetermined condition also includes that the current remaining power of the power battery of the hybrid vehicle is less than or equal to the power threshold. The predetermined condition also includes that the recovery current power of the power battery is greater than the second preset power threshold. Here, the second preset power threshold can be set to 50KW, and this application does not make specific restrictions on this. The predetermined condition also includes that the duration of the throttle opening of the hybrid vehicle greater than the second preset opening threshold is greater than the fourth preset time threshold, and the number of times is greater than or equal to the third number threshold. Here, as an example, when the second preset opening threshold is 10%, the fourth preset time threshold is 2 seconds, and the third number threshold is 2 times, the predetermined condition is that the duration of the throttle opening of the hybrid vehicle greater than 10% is greater than 2 seconds, and the number of times is greater than or equal to 2 times.

[0059] Regarding the above steps, in the specific implementation, after the engine braking function of the hybrid vehicle is activated in the high SOC direct drive mode on a long downhill slope, when it is detected that the hybrid vehicle meets any of the above predetermined conditions, the hybrid vehicle is controlled to exit the direct drive mode, and then the power system is coordinated to work normally.

[0060] Specifically, with respect to the above steps, controlling the hybrid vehicle to exit the direct drive mode includes:

[0061] The engine is controlled to stop working, and the torque of the engine is controlled to reach a preset torque; the generator is controlled to stop working; and the torque of the drive motor is controlled to reach a driving demand torque.

[0062] In the specific implementation of the above three steps, the engine is controlled to stop working, and the torque of the engine is controlled to reach the preset torque, which can be set to 0Nm. The generator is controlled to stop working, and the torque of the drive motor is controlled to reach the driving demand torque. In this way, the hybrid vehicle exits the direct drive mode.

[0063] The control method of the direct drive mode of a hybrid vehicle provided in an embodiment of the present application, first, when it is detected that the hybrid vehicle is traveling on a long downhill road, it is determined whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to a power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold; if so, the generator, engine and drive motor of the hybrid vehicle are controlled to make the hybrid vehicle enter the direct drive mode, so as to use the braking force generated by the internal resistance of the engine to brake the hybrid vehicle.

[0064] When the hybrid vehicle is in a high SOC state and traveling on a long downhill road, the present application controls the generator, the engine and the drive motor to control the hybrid vehicle to enter the direct drive mode, and fully utilizes the braking force generated by the internal resistance of the engine to brake the hybrid vehicle, thereby reducing the mechanical braking force of the hybrid vehicle in the long downhill situation, thereby reducing the wear of the mechanical braking system of the hybrid vehicle, increasing the service life of the mechanical braking system, and also avoiding traffic accidents caused by thermal failure of the braking system due to long-term continuous braking of the hybrid vehicle on a long downhill road.

[0065] See also Figure 2 , Figure 3 , Figure 2 This is one of the structural schematic diagrams of a control device for a hybrid vehicle direct drive mode provided in an embodiment of the present application. Figure 3 This is a second structural diagram of a control device for a hybrid vehicle direct drive mode provided in an embodiment of the present application. Figure 2 As shown in , the control device 200 includes:

[0066] The judgment module 201 is used to judge whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to the power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold when it is detected that the hybrid vehicle is traveling on a long downhill road;

[0067] The first control module 202 is configured to control the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters a direct drive mode, so as to brake the hybrid vehicle using the braking force generated by the internal resistance of the engine.

[0068] Furthermore, the judging module 201 is further configured to judge whether the hybrid vehicle is traveling on a long downhill road by the following steps:

[0069] Determining whether the slope of the road on which the hybrid vehicle is currently traveling is greater than a preset slope threshold, whether the current speed of the hybrid vehicle is greater than a speed threshold, whether the number of times the duration of the brake pedal of the hybrid vehicle being depressed is greater than a first preset time threshold is greater than a first number threshold, and whether the number of times the duration of the throttle opening of the hybrid vehicle being greater than the first preset opening threshold is greater than a second preset time threshold is greater than a second number threshold;

[0070] If both are yes, it is considered that the hybrid vehicle is traveling on a long downhill road.

[0071] Furthermore, when the first control module 202 is used to control the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters the direct drive mode, the first control module 202 is also used to:

[0072] Controlling the power generation of the generator to reach a preset power value;

[0073] controlling the driving torque of the engine to reach the minimum torque of the engine;

[0074] The power of the driving motor is controlled to reach the energy recovery power; wherein the energy recovery power is the sum of the DCDC power of the hybrid vehicle, the power of the passenger compartment air conditioning system, and the power of the cooling and heating system of the power battery.

[0075] like Figure 3 As shown, the control device 200 further includes a second control device 203. After controlling the generator, the engine and the drive motor of the hybrid vehicle to make the hybrid vehicle enter the direct drive mode, the second control device 203 is used to:

[0076] When it is detected that the hybrid vehicle meets any predetermined condition, the hybrid vehicle is controlled to exit the direct drive mode.

[0077] Furthermore, the predetermined conditions include that the duration of the slope of the road on which the hybrid vehicle is currently traveling being less than a preset slope threshold reaches a third preset time threshold, the current remaining power of the power battery of the hybrid vehicle is less than or equal to a power threshold, the recovery current power of the power battery is greater than a second preset power threshold, and the duration of the throttle opening of the hybrid vehicle being greater than the second preset opening threshold is greater than a fourth preset time threshold and is greater than or equal to a third number threshold.

[0078] Furthermore, when the second control device 203 is used to control the hybrid vehicle to exit the direct drive mode, the second control device 203 is also used to:

[0079] Controlling the engine to stop working, and controlling the torque of the engine to reach a preset torque;

[0080] Controlling the generator to stop working;

[0081] The torque of the driving motor is controlled to reach the driving demand torque.

[0082] See also Figure 4 , Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 4 As shown in , the electronic device 400 includes a processor 410 , a memory 420 and a bus 430 .

[0083] The memory 420 stores machine-readable instructions executable by the processor 410. When the electronic device 400 is running, the processor 410 communicates with the memory 420 via the bus 430. When the machine-readable instructions are executed by the processor 410, the above-mentioned Figure 1 The steps of the control method of the direct drive mode of the hybrid vehicle in the method embodiment shown, the specific implementation method can be found in the method embodiment, and will not be repeated here.

[0084] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figure 1 The steps of the control method of the direct drive mode of the hybrid vehicle in the method embodiment shown, the specific implementation method can be found in the method embodiment, and will not be repeated here.

[0085] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0086] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0087] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0089] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0090] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A control method for a hybrid vehicle direct drive mode, characterized in that: The control method comprises: When it is detected that the hybrid vehicle is traveling on a long downhill road, determining whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to a power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold; If so, the generator, the engine and the drive motor of the hybrid vehicle are controlled to make the hybrid vehicle enter a direct drive mode, so as to brake the hybrid vehicle by utilizing the braking force generated by the internal resistance of the engine.

2. The control method according to claim 1, characterized in that: The following steps are used to determine whether the hybrid vehicle is traveling on a long downhill road: Determining whether the slope of the road on which the hybrid vehicle is currently traveling is greater than a preset slope threshold, whether the current speed of the hybrid vehicle is greater than a speed threshold, whether the number of times the duration of the brake pedal of the hybrid vehicle being depressed is greater than a first preset time threshold is greater than a first number threshold, and whether the number of times the duration of the throttle opening of the hybrid vehicle being greater than the first preset opening threshold is greater than a second preset time threshold is greater than a second number threshold; If both are yes, it is considered that the hybrid vehicle is traveling on a long downhill road.

3. The control method according to claim 1, characterized in that: The controlling the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters a direct drive mode includes: Controlling the power generation of the generator to reach a preset power value; controlling the driving torque of the engine to reach the minimum torque of the engine; The power of the driving motor is controlled to reach the energy recovery power; wherein the energy recovery power is the sum of the DCDC power of the hybrid vehicle, the power of the passenger compartment air conditioning system, and the power of the cooling and heating system of the power battery.

4. The control method according to claim 1, characterized in that: After controlling the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters a direct drive mode, the control method further includes: When it is detected that the hybrid vehicle meets any predetermined condition, the hybrid vehicle is controlled to exit the direct drive mode.

5. The control method according to claim 4, characterized in that: The predetermined conditions include that the duration of the slope of the road on which the hybrid vehicle is currently traveling being less than a preset slope threshold reaches a third preset time threshold, the current remaining power of the power battery of the hybrid vehicle is less than or equal to a power threshold, the recovery current power of the power battery is greater than a second preset power threshold, and the duration of the throttle opening of the hybrid vehicle being greater than the second preset opening threshold is greater than a fourth preset time threshold and is greater than or equal to a third number threshold.

6. The control method according to claim 4, characterized in that: The controlling the hybrid vehicle to exit the direct drive mode includes: Controlling the engine to stop working, and controlling the torque of the engine to reach a preset torque; Controlling the generator to stop working; The torque of the driving motor is controlled to reach the driving demand torque.

7. A control device for a hybrid vehicle direct drive mode, characterized in that: The control device comprises: a judgment module, configured to judge whether the current remaining power of the power battery of the hybrid vehicle is greater than or equal to a power threshold, and whether the recovery current power of the power battery is less than a first preset power threshold, when it is detected that the hybrid vehicle is traveling on a long downhill road; The first control module is used to control the generator, the engine and the drive motor of the hybrid vehicle so that the hybrid vehicle enters a direct drive mode, so as to brake the hybrid vehicle using the braking force generated by the internal resistance of the engine.

8. The control device according to claim 7, characterized in that: The judging module is further configured to judge whether the hybrid vehicle is traveling on a long downhill road by the following steps: Determining whether the slope of the road on which the hybrid vehicle is currently traveling is greater than a preset slope threshold, whether the current speed of the hybrid vehicle is greater than a speed threshold, whether the number of times the duration of the brake pedal of the hybrid vehicle being depressed is greater than a first preset time threshold is greater than a first number threshold, and whether the number of times the duration of the throttle opening of the hybrid vehicle being greater than the first preset opening threshold is greater than a second preset time threshold is greater than a second number threshold; If both are yes, it is considered that the hybrid vehicle is traveling on a long downhill road.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method of the direct drive mode of a hybrid vehicle as described in any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method of the direct drive mode of a hybrid vehicle as described in any one of claims 1 to 6 are executed.

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