Vehicle driving mode control method, device and computer readable storage medium

Abstract

The embodiment of the application relates to the technical field of vehicles, and discloses a control method and device for a driving mode of a vehicle and a computer readable storage medium, the vehicle comprising a direct drive clutch used for transmitting driving power during a direct drive driving mode; the method comprises the following steps: detecting whether a vehicle speed is greater than a first preset vehicle speed, whether a change rate of requested power is less than a preset power change rate, whether a vehicle speed change rate is less than a preset vehicle speed change rate, and whether a change rate of an accelerator pedal opening degree is less than a preset accelerator pedal opening degree change rate; if it is detected that, in a sampling period, the vehicle speed is greater than the first preset vehicle speed, the change rate of the requested power is less than the preset power change rate, the vehicle speed change rate is less than the preset vehicle speed change rate, and the change rate of the accelerator pedal opening degree is less than the preset accelerator pedal opening degree change rate, then the driving mode of the vehicle is switched from a range extending driving mode to the direct drive driving mode, so that the direct drive clutch transmits the driving power to the vehicle, and the driving efficiency is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of vehicles, and in particular to a control method and device for a driving mode of a vehicle and a computer readable storage medium. BACKGROUND

[0002] Currently, the energy of a range-extended vehicle is converted by an engine driving a generator to provide power for the vehicle. Energy loss occurs in the energy conversion process. When the vehicle speed reaches a certain threshold, especially during high-speed driving, the energy loss is serious, resulting in low thermal efficiency of the engine and low driving efficiency of the vehicle. More fuel consumption is required to meet the power demand of the range-extended vehicle during high-speed driving. SUMMARY

[0003] In view of the above problems, embodiments of the present application provide a control method and device for a driving mode of a vehicle and a computer readable storage medium, to solve the problems of low driving efficiency and high fuel consumption of a range-extended vehicle during high-speed driving in the prior art.

[0004] According to an aspect of embodiments of the present application, a control method for a driving mode of a vehicle is provided. The vehicle includes a direct drive clutch for transmitting driving power for the vehicle during a direct drive driving mode. The control method includes detecting whether a vehicle speed is greater than a first preset vehicle speed, whether a change rate of a requested power is less than a preset power change rate, whether a change rate of the vehicle speed is less than a preset vehicle speed change rate, and whether a change rate of an accelerator pedal opening degree is less than a preset accelerator pedal opening degree change rate in a sampling period. If it is detected that the vehicle speed is greater than the first preset vehicle speed, the change rate of the requested power is less than the preset power change rate, the change rate of the vehicle speed is less than the preset vehicle speed change rate, and the change rate of the accelerator pedal opening degree is less than the preset accelerator pedal opening degree change rate in the sampling period, the driving mode of the vehicle is switched from a range-extended driving mode to the direct drive driving mode, so that the direct drive clutch transmits driving power for the vehicle.

[0005] According to another aspect of the embodiments of the present application, a control device for driving mode of a vehicle is provided, the vehicle comprising a direct drive clutch for transmitting driving power to the vehicle during a direct drive driving mode; the control device comprising: a detection module configured to detect whether a vehicle speed is greater than a first preset vehicle speed, a change rate of a requested power is less than a preset power change rate, a change rate of the vehicle speed is less than a preset vehicle speed change rate, and a change rate of an accelerator pedal opening degree is less than a preset accelerator pedal opening degree change rate within a sampling period; and a control module configured to control the driving mode of the vehicle to be switched from a range extending driving mode to the direct drive driving mode so that the direct drive clutch transmits driving power to the vehicle, if it is detected that the vehicle speed is greater than the first preset vehicle speed, the change rate of the requested power is less than the preset power change rate, the change rate of the vehicle speed is less than the preset vehicle speed change rate, and the change rate of the accelerator pedal opening degree is less than the preset accelerator pedal opening degree change rate within the sampling period.

[0006] In an optional manner, the control module comprises: a determination unit configured to determine a reduction speed ratio of the direct drive clutch according to an engine speed of the vehicle and a theoretical vehicle speed; and a control unit configured to control the vehicle to operate at a direct drive vehicle speed corresponding to the direct drive driving mode according to the reduction speed ratio.

[0007] In an optional manner, the determination unit comprises: an acquisition subunit configured to acquire the engine speed of the vehicle and a tire radius; and a determination subunit configured to determine the reduction speed ratio of the direct drive clutch according to the engine speed, the tire radius and the theoretical vehicle speed.

[0008] In an optional manner, the determination subunit comprises: a multiplication sub-subunit configured to multiply the tire radius and the engine speed to obtain a product; and a division sub-subunit configured to divide the product by the theoretical vehicle speed, and take a quotient as the reduction speed ratio of the direct drive clutch.

[0009] In an optional manner, the control device further comprises: an acquisition module configured to acquire a starting vehicle speed, a first requested power and a first opening degree of an accelerator pedal at a starting moment within the sampling period, and an ending vehicle speed, a second requested power and a second opening degree of the accelerator pedal at an ending moment; a vehicle speed change rate calculation module configured to calculate a vehicle speed change rate of the vehicle within the sampling period according to the starting vehicle speed and the ending vehicle speed; a requested power change rate calculation module configured to calculate a requested power change rate of the vehicle within the sampling period according to the first requested power and the second requested power; and an accelerator pedal opening degree change rate calculation module configured to calculate an accelerator pedal opening degree change rate of the vehicle within the sampling period according to the first opening degree and the second opening degree.

[0010] In an optional mode, the control device further comprises: a special working condition detection module, configured to detect whether the opening degree of the accelerator pedal is greater than a preset opening degree and whether the acceleration of the vehicle is greater than a preset acceleration; and a special working condition control module, configured to stop the step of controlling the driving mode of the vehicle to be switched from the range extending driving mode to the direct driving mode if it is detected that the opening degree of the accelerator pedal is greater than the preset opening degree and the acceleration of the vehicle is greater than the preset acceleration, so that the vehicle operates in the range extending driving mode.

[0011] In an optional mode, the control device further comprises: a mode switching condition detection module, configured to detect whether the vehicle speed in the sampling period is less than a second preset vehicle speed; and a range extending driving mode switching module, configured to control the driving mode of the vehicle to be switched from the direct driving mode to the range extending driving mode if it is detected that the vehicle speed in the sampling period is less than the second preset vehicle speed, wherein the first preset vehicle speed is greater than the second preset vehicle speed.

[0012] According to an aspect of an embodiment of the present application, an electronic device is provided, comprising: a controller; a memory configured to store one or more programs, which, when executed by the controller, perform the control method described above.

[0013] According to an aspect of an embodiment of the present application, a computer readable storage medium is also provided, which stores computer readable instructions. When the computer readable instructions are executed by a processor of a computer, the computer performs the control method described above.

[0014] According to an aspect of an embodiment of the present application, a computer program product or computer program is also provided, which comprises computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device performs the control method described above.

[0015] The embodiment of the present application adds a direct drive clutch on the vehicle to transmit driving power for the vehicle in the direct drive driving mode; if it is detected that the vehicle speed is greater than the first preset vehicle speed in a sampling period, the vehicle speed change rate is less than the preset vehicle speed change rate, the power change rate is less than the preset power change rate, and the accelerator pedal opening degree change rate is less than the preset accelerator pedal opening degree change rate, the driving mode of the vehicle is switched from the range extending driving mode to the direct drive driving mode, so that the direct drive clutch transmits driving power for the vehicle. In the direct drive mode, the engine power is directly used to provide kinetic energy for the vehicle, reducing the energy loss in the process of converting engine power into electric energy and electric energy into vehicle kinetic energy, thereby improving the driving efficiency of the range extending vehicle in the high speed driving process and reducing fuel consumption.

[0016] The above description is only a summary of the technical solutions of the embodiments of the present application, in order to more clearly understand the technical means of the embodiments of the present application, the embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings incorporated into the specification and forming part of the specification, show the embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings from these drawings without creative labor.

[0018] Figure 1 is a structure diagram of the range extending control system of the existing range extending vehicle.

[0019] Figure 2 is a range extending control system shown by an exemplary embodiment of the present application.

[0020] Figure 3 is a flowchart of a vehicle driving mode control method shown by an exemplary embodiment of the present application.

[0021] Figure 4 is a thermal efficiency curve diagram of the range extending driving mode and the direct drive driving mode at different vehicle speeds.

[0022] Figure 5 is another vehicle driving mode control method shown by an exemplary embodiment of the present application. Figure 3 is a flowchart of another vehicle driving mode control method shown by an exemplary embodiment of the present application.

[0023] Figure 6 is another vehicle driving mode control method shown by an exemplary embodiment of the present application. Figure 5The exemplary embodiment shown illustrates a flowchart of another vehicle drive mode control method.

[0024] Figure 7 Based on Figure 6 The exemplary embodiment shown illustrates a flowchart of another vehicle drive mode control method.

[0025] Figure 8 Based on Figure 3 The exemplary embodiment shown illustrates a flowchart of another vehicle drive mode control method.

[0026] Figure 9 Based on Figure 3 The exemplary embodiment shown illustrates a flowchart of another vehicle drive mode control method.

[0027] Figure 10 Based on Figure 3 , Figure 5 to Figure 9 The above is a flowchart illustrating another vehicle drive mode control method in any exemplary embodiment.

[0028] Figure 11 This is a schematic diagram of one implementation environment involved in this application.

[0029] Figure 12 This is a schematic diagram of the structure of a vehicle driving mode control device shown in an exemplary embodiment of this application.

[0030] Figure 13 This is a schematic diagram of the structure of a computer system for an electronic device, as illustrated in an exemplary embodiment of this application. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0033] The flowchart shown in the drawing is only an exemplary illustration, and is not necessarily required to include all contents and operations / steps, nor is it necessarily required to be executed in the order described. For example, some operations / steps can be further decomposed, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to actual conditions.

[0034] “Multiple” mentioned in the present application refers to two or more. “And / or” describes the association relationship of associated objects, and indicates that there can be three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. The character “ / ” generally represents an “or” relationship between the associated objects before and after it.

[0035] The existing range extending vehicle range extending control system is shown in Figure 1 , Figure 1 is a structural schematic diagram of the existing range extending vehicle range extending control system. The energy generated by the internal combustion engine drives the generator to generate electricity, and the electrical energy generated by the generator is provided to the motor, thereby providing the range extending vehicle with running kinetic energy. When the vehicle speed of the range extending vehicle reaches a certain threshold, especially during high-speed driving of the range extending vehicle, energy loss is serious, resulting in low thermal efficiency of the engine and low driving efficiency of the vehicle, and more fuel consumption is required to meet the power demand of the range extending vehicle during high-speed driving.

[0036] Therefore, in an exemplary embodiment of the present application, the existing range extending system control in the range extending vehicle is improved, as shown in Figure 2 , Figure 2 is a range extending control system shown in an exemplary embodiment of the present application. In the range extending control system of the original range extending vehicle, a new transmission system, a direct drive clutch, is added, and an adaptive vehicle driving mode control method is provided, for details, please refer to Figure 3 , Figure 3 is a flowchart of a vehicle driving mode control method shown in an exemplary embodiment of the present application. The vehicle includes a direct drive clutch for transmitting driving power during the direct drive driving mode of the vehicle; the control method includes S310 to S320, which are described in detail as follows:

[0037] S310: detecting whether the vehicle speed is greater than a first preset vehicle speed, whether the change rate of the requested power is less than a preset power change rate, whether the change rate of the vehicle speed is less than a preset vehicle speed change rate, and whether the change rate of the accelerator pedal opening is less than a preset accelerator pedal opening change rate in a sampling period.

[0038] The first preset vehicle speed, the preset power change rate, the preset vehicle speed change rate, and the preset accelerator pedal opening change rate are all preset parameters before the vehicle is shipped. The requested power is the total power requested by the vehicle, i.e., the demand power including all functions, losses, etc.

[0039] The first preset vehicle speed and the second preset vehicle speed can be determined through preliminary calibration experiments, and specific reference can be made to Figure 4 , Figure 4 is a thermal efficiency curve diagram of the extended-range driving mode and the direct-drive driving mode at different powers. Wherein, the thermal efficiencies of the two modes are the same, that is, Figure 4 The point where the two curves intersect in the η1=η2, the critical vehicle speed (V) is between 60 km / h and 90 km / h, which represents that the thermal efficiencies of the extended-range driving mode and the direct-drive driving mode are equivalent, and the fuel consumption difference is not large, which can be used as the speed critical point for switching between the extended-range driving mode and the direct-drive driving mode.

[0040] When the vehicle speed of the vehicle is the critical vehicle speed, frequent vehicle speed fluctuations are prone to occur, causing the driving mode of the vehicle to be frequently switched. In order to avoid the problem of frequent switching of the driving mode, the present application improves the critical vehicle speed for detecting the mode switching of the vehicle: a calibration speed value ΔV is added / subtracted to V to increase the threshold range of the preset vehicle speed. Specifically, the first preset vehicle speed in the present application is V+ΔV, and the second preset vehicle speed is V-ΔV.

[0041] During the operation of the vehicle in the extended-range driving mode, the four detection processes in this step are simultaneously performed. In order to more accurately switch the direct-drive driving mode, the four detection conditions described in this step need to be met simultaneously. It is worth noting that the vehicle speed in the sampling period needs to be continuously greater than the first preset vehicle speed, for example, if the sampling period is 3 seconds, the vehicle speed needs to be greater than the first preset vehicle speed within 3 seconds.

[0042] In some embodiments, the above-mentioned three conversion rates can be replaced by average values, that is, it is detected whether the vehicle speed is greater than the first preset vehicle speed, the change rate of the requested power is less than the preset power average value, the change rate of the vehicle speed is less than the preset vehicle speed average value, and the change rate of the accelerator pedal opening is less than the preset accelerator pedal opening average value. Compared with the detection of the related average values, the detection of the related change rates in this embodiment can avoid large accidental errors and make the detection process more accurate.

[0043] S320: If it is detected that the vehicle speed is greater than the first preset vehicle speed, the change rate of the requested power is less than the preset power change rate, the change rate of the vehicle speed is less than the preset vehicle speed change rate, and the change rate of the accelerator pedal opening is less than the preset accelerator pedal opening change rate, the driving mode of the vehicle is switched from the extended-range driving mode to the direct-drive driving mode, so that the direct-drive clutch transmits driving power to the vehicle.

[0044] For example, the first preset vehicle speed is 80 km / h, the preset power change rate is 13%, the preset vehicle speed change rate is 15%, and the preset accelerator pedal opening change rate is 12%. When the vehicle is traveling in range-extended drive mode, if it is detected that the vehicle speed is greater than 80 km / h within the sampling period, the requested power change rate is less than 13%, the vehicle speed change rate is less than 15%, and the accelerator pedal opening change rate is less than 12%, then the control switches the vehicle's drive mode from range-extended drive mode to direct drive mode, and controls the direct drive clutch to engage to transmit driving power to the vehicle.

[0045] This embodiment adds a direct-drive clutch to the vehicle to transmit driving power when the vehicle is in direct-drive mode. By detecting relevant vehicle condition parameters within a sampling period, if the vehicle speed is detected to be greater than a first preset speed within the sampling period, it indicates that the vehicle is in a high-speed driving process. If the rate of change of requested power is less than the preset rate of change of power, the rate of change of vehicle speed is less than the preset rate of change of vehicle speed, and the rate of change of accelerator pedal opening is less than the preset rate of change of accelerator pedal opening, then the vehicle's driving mode is switched from range-extended driving mode to direct-drive mode, so that the direct-drive clutch transmits driving power to the vehicle. In direct-drive mode, the engine's output power is directly used to provide kinetic energy to the vehicle, reducing energy loss in the process of converting engine output power into electrical energy and electrical energy into vehicle kinetic energy, thereby improving the driving efficiency of the range-extended vehicle during high-speed driving and reducing fuel consumption.

[0046] In another exemplary embodiment of this application, a detailed description is provided of how to switch the vehicle's drive mode from range-extended drive mode to direct drive mode. Please refer to [link to relevant documentation] for details. Figure 5 , Figure 5 Based on Figure 3 The exemplary embodiment shown illustrates a flowchart of another vehicle drive mode control method. Based on Figure 3 The S320 shown further includes S510 to S520, which are described in detail below:

[0047] S510: Determine the reduction ratio of the direct drive clutch based on the vehicle's engine speed and theoretical vehicle speed.

[0048] The theoretical vehicle speed differs from the first and second preset vehicle speeds mentioned above. The theoretical vehicle speed includes the theoretical speed at the critical point of switching between range-extended drive mode and direct drive mode (i.e., the aforementioned critical speed V), and the maximum theoretical speed designed for the vehicle (V0). max There is a mapping relationship between theoretical vehicle speed and reduction ratio. Based on engine speed, critical vehicle speed and maximum theoretical vehicle speed, the range of reduction ratio of direct drive clutch can be accurately determined, that is, the range of reduction ratio during economic engine operation, which corresponds to the direct drive speed for economical fuel consumption.

[0049] S520: Determine the direct drive speed corresponding to the direct drive mode according to the reduction speed ratio, and control the vehicle to run at the direct drive speed.

[0050] In order to ensure the high driving efficiency of the vehicle in the direct drive mode, and considering the economic factor, the direct drive speed can be adjusted by the reduction speed ratio, that is, the direct drive speed corresponding to the reduction speed ratio is adjusted during the running of the vehicle in the direct drive mode.

[0051] The embodiment illustrates the determination method of the reduction speed ratio of the direct drive clutch. The value range of the reduction speed ratio is calculated by the engine speed and the theoretical vehicle speed, so that the direct drive speed is accurately adjusted in the economic speed interval by controlling and adjusting the reduction speed ratio in the direct drive mode of the vehicle, thereby improving the driving efficiency of the vehicle in the direct drive mode.

[0052] In another exemplary embodiment of the present application, the calculation process of the reduction speed ratio is illustrated in detail, please refer to Figure 6 , Figure 6 is another flowchart of a control method of a vehicle driving mode shown in the exemplary embodiment based on Figure 5 Further, Figure 5 S510 shown in includes S610 to S620, which are described as follows:

[0053] S610: Obtain the engine speed and the tire radius of the vehicle.

[0054] In some embodiments, the tire radius is equivalent to the rolling radius of the tire when the vehicle is running.

[0055] S620: Determine the reduction speed ratio of the direct drive clutch according to the engine speed, the tire radius and the theoretical vehicle speed.

[0056] Exemplarily, after the engine speed, the tire radius and the theoretical vehicle speed are calculated and processed, the result value has a mapping relationship with the reduction speed ratio of the direct drive clutch, so that the reduction speed ratio of the direct drive clutch corresponding to the result value can be accurately determined according to the mapping relationship therebetween. For example, the reduction speed ratio is calculated according to i=(Axrnv) / v. Wherein, v represents the theoretical vehicle speed, A represents a constant coefficient, r represents the tire radius, n represents the engine speed, and i represents the reduction speed ratio.

[0057] The embodiment provides a calculation method of the reduction speed ratio of the direct drive clutch. The reduction speed ratio of the direct drive clutch is determined according to the engine speed, the tire radius and the theoretical vehicle speed. The reduction speed ratio can be quickly calculated by a simple formula, thereby accelerating the calculation speed of the reduction speed ratio.

[0058] In another example embodiment of the present application, a method for determining the reduction ratio of the direct drive clutch based on the engine speed, the tire radius and the theoretical vehicle speed is provided, which is shown in detail in Figure 7 , Figure 7 based on Figure 6 the flowchart of another control method of the vehicle driving mode is shown in FIG. 6. Further, Figure 6 S620 includes S710-S720, which are shown in detail as follows:

[0059] S710: multiply the tire radius and the engine speed to obtain a product.

[0060] S720: divide the product by the theoretical vehicle speed, and the quotient is taken as the reduction ratio of the direct drive clutch.

[0061] The reduction ratio of the direct drive clutch is calculated according to the following formula:

[0062] v = (0.377 x r x n) / i;

[0063] wherein v represents the theoretical vehicle speed, r represents the tire radius, n represents the engine speed, and i represents the reduction ratio. The high-efficiency and economic speed range is n1-n2. When the engine speed is the lower threshold n1, v max , the reduction ratio i is calculated according to the above formula as i > (0.377 x r x n1) / V; and when the engine speed is the upper threshold n2, v max , the reduction ratio i is calculated according to the above formula as i < (0.377 x r x n2) / V max .

[0064] The present embodiment provides a calculation method of the reduction ratio of the direct drive clutch, which calculates the value range of the reduction ratio in the engine economic speed range based on the engine speed, the tire radius and the theoretical vehicle speed, so as to ensure that the vehicle engine is in the economic speed range in the direct drive mode, and thus the corresponding direct drive speed belongs to the economic speed range, thereby improving the driving efficiency of the vehicle in the direct drive mode.

[0065] In another example embodiment of the present application, the calculation processes of the change rate of the requested power, the change rate of the vehicle speed and the change rate of the accelerator pedal opening in the sampling period are described in detail, which is shown in detail in Figure 8 , Figure 8 based on Figure 3 the flowchart of another control method of the vehicle driving mode is shown in FIG. 6. Further, Figure 3The S310 to S320 shown at least further include S810 to S840, which can be placed before S310, and are specifically introduced as follows:

[0066] S810: Obtain the starting vehicle speed corresponding to the starting moment of the sampling period, the first request power and the first opening degree of the accelerator pedal, and the ending vehicle speed corresponding to the ending moment, the second request power and the second opening degree of the accelerator pedal.

[0067] Exemplarily, the sampling period T is generally greater than 2 seconds, the starting moment is T1, and the ending moment is T2, i.e., T2-T1>2 seconds. The parameters corresponding to the moments T1 and T2 are obtained respectively.

[0068] S820: Calculate the vehicle speed change rate in the sampling period according to the starting vehicle speed and the ending vehicle speed.

[0069] S830: Calculate the request power change rate of the vehicle in the sampling period according to the first request power and the second request power.

[0070] S840: Calculate the accelerator pedal opening degree change rate of the vehicle in the sampling period according to the first opening degree and the second opening degree.

[0071] Exemplarily, the starting vehicle speed corresponding to the starting moment T1 of the sampling period is V1, the first request power is P1, and the first opening degree is K1; the ending vehicle speed corresponding to the moment T2 is V2, the second request power is P2, and the second opening degree is K2. The vehicle speed change rate is |(V2-V1) / V1|, the request power change rate is |(P2-P1) / P1|, and the accelerator pedal opening degree change rate is |(K2-K1) / K1|.

[0072] The embodiment provides a specific calculation method of the vehicle speed change rate, the request power change rate and the accelerator pedal opening degree change rate in the sampling period, and the corresponding change rate parameters are quickly calculated through the simple calculation method, so that the efficiency of the calculation process is improved.

[0073] In another exemplary embodiment of the present application, a special working condition control method is provided: during the acceleration process of the vehicle, the driving mode of the vehicle is not controlled to be switched from the range extending driving mode to the direct driving mode, and the range extending driving mode is maintained, which is specifically described in Figure 9 , Figure 9 is based on Figure 3 Another flowchart of a control method of another vehicle driving mode is shown in the exemplary embodiment shown in Figure 3 The S310 to S320 shown at least further include S910 to S920, which are specifically introduced as follows:

[0074] S910: detecting whether the opening degree of the accelerator pedal is greater than a preset opening degree and whether the acceleration of the vehicle is greater than a preset acceleration.

[0075] The preset opening degree is generally 80 degrees. The acceleration is a parameter calculated in real time by the vehicle according to the current working condition, which can be directly obtained in the detection process.

[0076] S920: if the opening degree of the accelerator pedal is greater than the preset opening degree and the acceleration of the vehicle is greater than the preset acceleration, stopping the step of controlling the driving mode of the vehicle to be switched from the extended-range driving mode to the direct-drive driving mode, so that the vehicle runs in the extended-range driving mode.

[0077] If the opening degree of the accelerator pedal is greater than the preset opening degree and the acceleration of the vehicle is greater than the preset acceleration, it indicates that the current vehicle is in an accelerating state. In order to meet the acceleration performance requirements of the vehicle's acceleration process, while avoiding the occurrence of bad NVH (Noise Vibration Harshness) experience and acceleration experience caused by power interruption and gear shifting impact during the process of switching the driving mode from the extended-range driving mode to the direct-drive driving mode.

[0078] The embodiment provides a special control mode for an accelerating vehicle in the extended-range driving mode. Even if the vehicle meets the prerequisite for switching from the extended-range driving mode to the direct-drive driving mode, if the opening degree of the accelerator pedal is greater than the preset opening degree and the acceleration of the vehicle is greater than the preset acceleration, the vehicle is maintained to run in the extended-range driving mode, that is, the driving mode of the vehicle in the accelerating state is not switched, so as to ensure the acceleration requirements of the vehicle and avoid the power interruption during the mode switching process, thereby improving the driving comfort of the vehicle.

[0079] In another example embodiment of the present application, a control mode for switching the driving mode of the vehicle from the direct-drive driving mode to the extended-range driving mode is provided, which is described in detail in Figure 10 , Figure 10 is another flowchart of a control method of a vehicle driving mode based on any one of the example embodiments in Figure 3 , Figure 5 to Figure 9 The control method at least further includes S1010 to S1020, which are described in detail as follows:

[0080] S1010: detecting whether the vehicle speed in a sampling period is less than a second preset vehicle speed; wherein the first preset vehicle speed is greater than the second preset vehicle speed.

[0081] The prerequisite for triggering S1010 is to detect that the driving mode of the current vehicle is the direct-drive driving mode.

[0082] The second preset vehicle speed in the embodiment = V-ΔV, i.e., the critical vehicle speed - the calibration speed value, so as to avoid the problem of frequent switching of the driving mode when the vehicle speed of the vehicle is close to the critical vehicle speed.

[0083] S1020: If it is detected that the vehicle speed in the sampling period is less than the second preset vehicle speed, the driving mode of the vehicle is switched from the direct drive mode to the extended range driving mode.

[0084] It is worth noting that the vehicle speed in the sampling period must be less than the second preset vehicle speed, i.e., the vehicle speed in the sampling period needs to be continuously maintained at a vehicle speed less than the second preset vehicle speed.

[0085] For example, the second preset vehicle speed = 70-8 = 62 km / h, and if the vehicle is in the operating condition of the direct drive mode, and the vehicle speed in the sampling period T is less than 62 km / h, the driving mode of the vehicle is switched from the direct drive mode to the extended range driving mode.

[0086] The embodiment further illustrates the prerequisite for switching the driving mode of the vehicle from the direct drive mode to the extended range driving mode, i.e., the vehicle speed in the sampling period is less than the second preset vehicle speed, so as to accurately switch the driving mode of the vehicle.

[0087] Please refer to Figure 11 , Figure 11 is a schematic diagram of an implementation environment related to the present application. The implementation environment includes a vehicle end 100, a controller 200, and a transmission system 101 arranged in the vehicle end 100. The controller 200 communicates with the vehicle end 100 through a wireless network, and the controller 200 can be as shown in Figure 11 inside the vehicle end 100, and can also be independent of the vehicle end 100. The embodiment does not limit it.

[0088] The vehicle end 100 inside the vehicle end 100 is newly added to the transmission system 101 in the existing extended range vehicle. The transmission system 101 mainly includes a direct drive clutch and a reduction gear. The vehicle end 100 of the present application combines the power and quietness of a pure electric vehicle, while avoiding the disadvantages of low driving efficiency and high fuel consumption in the extended range driving mode, thereby improving the operating economy of the vehicle.

[0089] The controller 200 can control the switching of the driving mode of the vehicle end 100 by obtaining the working condition data generated by the vehicle end 100, so that the vehicle end 100 travels in the switched driving mode. The controller 200 can perform the control method shown in any of the example embodiments described above. For example, the controller 200 detects whether the vehicle speed is greater than a first preset vehicle speed, whether the change rate of the requested power is less than a preset power change rate, whether the vehicle speed change rate is less than a preset vehicle speed change rate, and whether the accelerator pedal opening degree change rate is less than a preset accelerator pedal opening degree change rate in a sampling period; if it is detected that the vehicle speed is greater than the first preset vehicle speed, the change rate of the requested power is less than the preset power change rate, the vehicle speed change rate is less than the preset vehicle speed change rate, and the accelerator pedal opening degree change rate is less than the preset accelerator pedal opening degree change rate in the sampling period, the controller 200 controls the driving mode of the vehicle to be switched from the range extending driving mode to the direct drive driving mode, so that the direct drive clutch transmits driving power to the vehicle.

[0090] The controller 200 can be a physical server, a server cluster composed of multiple physical servers, or a distributed system, wherein the multiple servers can form a block chain, and the servers are nodes on the block chain. The controller 200 can also be a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN (Content Delivery Network), and basic cloud computing services such as big data and artificial intelligence platforms. The present application is not limited in this regard.

[0091] Another aspect of the present application also provides a vehicle driving mode control device, as shown in Figure 12 Figure 12 is a structural schematic diagram of a vehicle driving mode control device according to an example embodiment of the present application.

[0092] The vehicle includes a direct drive clutch for transmitting driving power to the vehicle during the direct drive driving mode. The control device 1200 includes:

[0093] The detection module 1210 detects whether the vehicle speed is greater than a first preset vehicle speed, whether the change rate of the requested power is less than a preset power change rate, whether the vehicle speed change rate is less than a preset vehicle speed change rate, and whether the accelerator pedal opening degree change rate is less than a preset accelerator pedal opening degree change rate in a sampling period.

[0094] ​The control module 1230 is configured to control the driving mode of the vehicle to switch from the range extending driving mode to the direct driving mode if it is detected that the vehicle speed is greater than the first preset vehicle speed, the change rate of the requested power is less than the preset change rate of the requested power, the change rate of the vehicle speed is less than the preset change rate of the vehicle speed, and the change rate of the accelerator pedal opening is less than the preset change rate of the accelerator pedal opening, so that the direct driving clutch transmits driving power to the vehicle.

[0095] In another example embodiment, the control module 1230 includes:

[0096] The determination unit is configured to determine the reduction ratio of the direct driving clutch according to the engine speed and the theoretical vehicle speed of the vehicle.

[0097] The control unit is configured to determine the direct driving speed corresponding to the direct driving mode according to the reduction ratio, and control the vehicle to operate at the direct driving speed.

[0098] In another example embodiment, the determination unit includes:

[0099] The acquisition block is configured to acquire the engine speed and the tire radius of the vehicle.

[0100] The determination block is configured to determine the reduction ratio of the direct driving clutch according to the engine speed, the tire radius, and the theoretical vehicle speed.

[0101] In another example embodiment, the determination block includes:

[0102] The multiplication sub-block is configured to multiply the tire radius and the engine speed to obtain a product.

[0103] The quotient sub-block is configured to divide the product by the theoretical vehicle speed, and take the quotient as the reduction ratio of the direct driving clutch.

[0104] In another example embodiment, the control device 1200 further includes:

[0105] The acquisition module is configured to acquire a starting vehicle speed, a first requested power, and a first opening of the accelerator pedal at a starting time of a sampling period, and an ending vehicle speed, a second requested power, and a second opening of the accelerator pedal at an ending time of the sampling period.

[0106] The vehicle speed change rate calculation module is configured to calculate the vehicle speed change rate of the vehicle in the sampling period according to the starting vehicle speed and the ending vehicle speed.

[0107] The requested power change rate calculation module is configured to calculate the requested power change rate of the vehicle in the sampling period according to the first requested power and the second requested power.

[0108] The accelerator pedal opening degree change rate calculation module is configured to calculate a change rate of the accelerator pedal opening degree of the vehicle in the sampling period according to the first opening degree and the second opening degree.

[0109] In another example embodiment, the control device 1200 further comprises:

[0110] The special working condition detection module is configured to detect whether the opening degree of the accelerator pedal is greater than a preset opening degree and whether the acceleration of the vehicle is greater than a preset acceleration.

[0111] The special working condition control module is configured to stop the step of switching the driving mode of the vehicle from the range extending driving mode to the direct drive driving mode if it is detected that the opening degree of the accelerator pedal is greater than the preset opening degree and the acceleration of the vehicle is greater than the preset acceleration, so that the vehicle operates in the range extending driving mode.

[0112] In another example embodiment, the control device 1200 further comprises:

[0113] The mode switching condition detection module is configured to detect whether the vehicle speed in the sampling period is less than a second preset vehicle speed; wherein the first preset vehicle speed is greater than the second preset vehicle speed.

[0114] The range extending driving mode switching module is configured to switch the driving mode of the vehicle from the direct drive driving mode to the range extending driving mode if it is detected that the vehicle speed in the sampling period is less than the second preset vehicle speed.

[0115] The control device of the present application detects relevant parameters, and if it is detected that the vehicle speed in the sampling period is greater than the first preset vehicle speed, it indicates that the vehicle is in a high speed driving process, the change rate of the requested power is less than the preset power change rate, the change rate of the vehicle speed is less than the preset vehicle speed change rate, and the change rate of the accelerator pedal opening degree is less than the preset accelerator pedal opening degree change rate, the driving mode of the vehicle is switched from the range extending driving mode to the direct drive driving mode, so that the direct drive clutch transmits driving power to the vehicle. In the direct drive mode, the power output of the engine is directly used to provide kinetic energy for the vehicle, reducing the energy loss in the process of converting the power output of the engine into electric energy and the electric energy into kinetic energy of the vehicle, thereby improving the driving efficiency of the range extending vehicle in the high speed driving process and reducing fuel consumption.

[0116] It should be noted that the control device of the vehicle driving mode provided in the above embodiments and the control method of the vehicle driving mode provided in the above embodiments belong to the same concept, and the specific manner in which each module and unit performs the operation has been described in detail in the method embodiments, which will not be described here.

[0117] Another aspect of the present application also provides an electronic device comprising: a controller; a memory for storing one or more programs, when the one or more programs are executed by the controller, to perform the above-mentioned control method.

[0118] Referring to Figure 13 , Figure 13 is a structural diagram of a computer system of an electronic device according to an example embodiment of the present application, which shows a structural diagram of a computer system of an electronic device suitable for implementing the embodiments of the present application.

[0119] It should be noted that Figure 13 The computer system 1300 of the electronic device shown is only an example and should not impose any limitation on the functions and usage range of the embodiments of the present application.

[0120] As Figure 13 shown, the computer system 1300 includes a central processing unit (CPU) 1301, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 1302 or programs loaded from a storage portion 1308 into a random access memory (RAM) 1303, such as performing the methods in the above-described embodiments. In the RAM 1303, various programs and data required for system operation are also stored. The CPU 1301, the ROM 1302, and the RAM 1303 are connected to each other through a bus 1304. An input / output (I / O) interface 1305 is also connected to the bus 1304.

[0121] The following components are connected to the I / O interface 1305: an input portion 1306 including a keyboard, a mouse, and the like; an output portion 1307 including a cathode ray tube (CRT), a liquid crystal display (LCD), and the like, and a speaker, and the like; a storage portion 1308 including a hard disk, and the like; and a communication portion 1309 including a network interface card such as a LAN (Local Area Network) card, a modem, and the like. The communication portion 1309 performs communication processing via a network such as the Internet. A drive 1310 is also connected to the I / O interface 1305 as necessary. A removable media 1311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, and the like is mounted on the drive 1310 as necessary, so that a computer program read therefrom is installed in the storage portion 1308 as necessary.

[0122] In particular, the processes described above with reference to the flow charts can be implemented as computer software programs in accordance with the embodiments of the present application. For example, the embodiments of the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program containing computer programs for executing the methods shown in the flow charts. In such embodiments, the computer program can be downloaded and installed from a network by the communication section 1309, and / or installed from the detachable medium 1311. When the computer program is executed by the central processing unit (CPU) 1301, various functions defined in the system of the present application are executed.

[0123] It should be noted that the computer readable medium shown in the embodiments of the present application can be a computer readable signal medium or a computer readable storage medium or any combination of the two. The computer readable storage medium may, for example, be an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination of the above. More specific examples of the computer readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus or device. In the present application, the computer readable signal medium can include a data signal carried in a baseband or as a part of a carrier wave, which carries computer readable computer programs. Such a propagated data signal can take many forms, including but not limited to, an electromagnetic signal, an optical signal or any suitable combination of the above. The computer readable signal medium can also be any computer readable medium that can send, propagate or transfer programs for use by or in connection with an instruction execution system, apparatus or device. The computer programs contained in the computer readable medium can be transmitted by any suitable medium, including but not limited to wireless, wired, or the like, or any suitable combination of the above.

[0124] The flow and block diagrams in the drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flow and block diagrams can represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or the blocks may be executed in the reverse order, depending on the functionality involved. It will also be noted that each block of the block diagrams and / or flowchart illustrations, and combinations thereof, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or combinations of hardware and software.

[0125] The units described in the embodiments of the present application can be implemented by software, or by hardware, or by a combination of software and hardware. The units described can also be located in a single processor. In some cases, the names of the units do not constitute a limitation on the units themselves.

[0126] Another aspect of the present application provides a computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the control method of the vehicle driving mode as described above. The computer readable storage medium can be included in the electronic device described in the embodiments above, or can exist separately from the electronic device.

[0127] Another aspect of the present application provides a computer program product or computer program, which includes computer instructions. The computer instructions are stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device executes the control method provided in the embodiments above.

[0128] According to an aspect of an embodiment of the present application, a computer system is also provided, which includes a central processing unit (CPU) that can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) or a program loaded from a storage section into a random access memory (RAM), such as performing the method in the above-described embodiments. In the RAM, various programs and data required for system operation are also stored. The CPU, the ROM, and the RAM are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus.

[0129] Connected to the I / O interface are an input section including a keyboard, a mouse, etc.; an output section including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section including a hard disk, etc.; and a communication section including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section performs communication processing via a network such as the Internet. A drive is also connected to the I / O interface as necessary. A removable recording medium, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is attached to the drive as necessary, so that a computer program read out therefrom is installed into the storage section as necessary.

[0130] The above-described content is merely a preferred exemplary embodiment of the present application, and is not intended to limit the implementation of the present application. Those skilled in the art can easily make corresponding modifications or variations according to the main idea and spirit of the present application, and the protection scope of the present application should be subject to the protection scope required by the claims.

Claims

1. A method for controlling a vehicle driving mode, characterized in that, The vehicle includes: a direct-drive clutch for transmitting drive power during direct-drive mode; the control method includes: The system detects whether the vehicle speed is greater than a first preset vehicle speed, whether the rate of change of requested power is less than a preset rate of change of power, whether the rate of change of vehicle speed is less than a preset rate of change of vehicle speed, and whether the rate of change of accelerator pedal opening is less than a preset rate of change of accelerator pedal opening; wherein, the first preset vehicle speed is the sum of the critical vehicle speed and the calibrated speed value, and the critical vehicle speed is the vehicle speed when the thermal efficiency of the range-extended drive mode and the direct drive mode is the same. If it is detected that the vehicle speed is greater than the first preset vehicle speed during the sampling period, the rate of change of the requested power is less than the preset power rate of change, the rate of change of the vehicle speed is less than the preset vehicle speed rate of change, and the rate of change of the accelerator pedal opening is less than the preset accelerator pedal opening rate of change, then the control switches the vehicle's driving mode from the range-extended driving mode to the direct-drive driving mode, so that the direct-drive clutch transmits driving power to the vehicle.

2. The control method according to claim 1, characterized in that, The control switches the vehicle's drive mode from range-extended drive mode to direct drive mode, so that the direct drive clutch transmits drive power to the vehicle, further including: The reduction ratio of the direct drive clutch is determined based on the engine speed and theoretical vehicle speed of the vehicle. The direct drive speed corresponding to the direct drive mode is determined based on the reduction ratio, and the vehicle is controlled to run at the direct drive speed.

3. The control method according to claim 2, characterized in that, The step of determining the reduction ratio of the direct drive clutch based on the vehicle's engine speed and theoretical vehicle speed further includes: Obtain the engine speed and tire radius of the vehicle; The reduction ratio of the direct drive clutch is determined based on the engine speed, the tire radius, and the theoretical vehicle speed.

4. The control method according to claim 3, characterized in that, The step of determining the reduction ratio of the direct drive clutch based on the engine speed, the tire radius, and the theoretical vehicle speed further includes: The product of the tire radius and the engine speed is calculated. The product and the theoretical vehicle speed are divided, and the resulting quotient is used as the reduction ratio of the direct drive clutch.

5. The control method according to claim 1, characterized in that, The control method further includes: The starting speed, first requested power and first accelerator pedal opening of the vehicle at the start time corresponding to the start time within the sampling period are obtained, as well as the ending speed, second requested power and second accelerator pedal opening at the end time. The vehicle speed change rate during the sampling period is calculated based on the initial vehicle speed and the final vehicle speed. The rate of change of the vehicle's requested power during the sampling period is calculated based on the first requested power and the second requested power. Based on the first opening degree and the second opening degree, the rate of change of the accelerator pedal opening degree of the vehicle during the sampling period is calculated.

6. The control method according to claim 1, characterized in that, The control method further includes: Detect whether the opening of the accelerator pedal is greater than a preset opening, and detect whether the acceleration of the vehicle is greater than a preset acceleration; If it is detected that the opening of the accelerator pedal is greater than the preset opening and the acceleration of the vehicle is greater than the preset acceleration, then the step of controlling the switching of the vehicle's drive mode from range-extended drive mode to direct drive mode is stopped, so that the vehicle operates in range-extended drive mode.

7. The control method according to any one of claims 1 to 6, characterized in that, The control method further includes: The system detects whether the vehicle speed is less than a second preset vehicle speed within the sampling period; wherein the first preset vehicle speed is greater than the second preset vehicle speed. If the vehicle speed is detected to be less than the second preset vehicle speed during the sampling period, the driving mode of the vehicle is switched from the direct drive mode to the range extender drive mode.

8. A control device for vehicle driving modes, characterized in that, The vehicle includes: a direct-drive clutch for transmitting drive power during direct-drive mode; the control device includes: The detection module is used to detect whether the vehicle speed is greater than a first preset vehicle speed, whether the rate of change of requested power is less than a preset rate of change of power, whether the rate of change of vehicle speed is less than a preset rate of change of vehicle speed, and whether the rate of change of accelerator pedal opening is less than a preset rate of change of accelerator pedal opening within the sampling period; wherein, the first preset vehicle speed is the sum of the critical vehicle speed and the calibrated speed value, and the critical vehicle speed is the vehicle speed when the thermal efficiency of the range-extended drive mode and the direct drive mode is the same. The control module is configured to switch the vehicle's driving mode from the range-extended driving mode to the direct-drive mode if it detects that the vehicle speed is greater than the first preset vehicle speed, the rate of change of the requested power is less than the preset power change rate, the rate of change of the vehicle speed is less than the preset vehicle speed change rate, and the rate of change of the accelerator pedal opening is less than the preset accelerator pedal opening change rate during the sampling period, so that the direct-drive clutch transmits driving power to the vehicle.

9. An electronic device, characterized in that, include: Controller; A memory for storing one or more programs, which, when executed by the controller, cause the controller to implement the control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores computer-readable instructions that, when executed by the computer's processor, cause the computer to perform the control method according to any one of claims 1 to 7.

Images