Vehicle downshift control method and device, vehicle and storage medium

Abstract

The invention discloses a vehicle downshift control method and device, a vehicle and a storage medium. The vehicle downshift control method comprises the following steps: in a vehicle climbing scene, acquiring a first engine rotating speed of a vehicle, a theoretical downshift rotating speed and an engine limit rotating speed corresponding to a limit torque of an engine, and determining an engine correction torque according to the first engine rotating speed and the theoretical downshift rotating speed; obtaining a second engine rotating speed after the engine is controlled to operate by increasing the engine correction torque, and determining that the engine sends a current gear maintaining instruction or a downshift instruction to a gearbox according to the engine limit rotating speed and the second engine rotating speed, and controlling the gearbox to maintain the current gear based on the current gear maintaining instruction, or controlling the gearbox to perform downshift based on the downshift instruction. The gear maintaining time in the vehicle climbing scene is maintained, the gear shifting number is reduced, and the climbing performance and economical efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a vehicle downshift control method, device, vehicle and storage medium. Background Art

[0002] In the climbing scene, the vehicle has the problem of frequent gear shifting due to increased vehicle resistance, improper driver operation, unreasonable gear shifting decisions, etc., and the vehicle speed will decrease each time the vehicle shifts gears during the uphill process, resulting in energy waste. At present, the vehicle uses engine control in the climbing scene, but it cannot obtain road slope information and cannot determine whether it is in a ramp scene. The control input is only the driver's accelerator pedal opening, and there is no corresponding optimization control. The AMT gearbox can calculate the slope according to the acceleration sensor, and adjust the gear shift speed after obtaining the slope to avoid downshifting due to insufficient power after upshifting on the slope, increase the downshift speed, make downshifting more active, try to climb in low gear, and enhance the climbing power. However, the existing technology only optimizes the gearbox for vehicle climbing, while the engine end still relies on the driver's throttle input for control. The two are independent of each other, and the gear switching cannot be well coordinated with the engine torque, and the engine performance cannot be fully utilized. Summary of the invention

[0003] The present invention provides a vehicle downshift control method, device, vehicle and storage medium to solve the problem that the gear switching of the vehicle in a climbing scenario cannot be well coordinated with the engine torque and the engine performance cannot be fully utilized.

[0004] According to one aspect of the present invention, a vehicle downshift control method is provided, the vehicle downshift control method comprising:

[0005] In a vehicle climbing scenario, obtaining a first engine speed of the vehicle, a theoretical downshift speed, and an engine limit speed corresponding to a limit torque of the engine, and determining an engine correction torque according to the first engine speed and the theoretical downshift speed;

[0006] A second engine speed after controlling the engine to increase the engine correction torque is obtained, and according to the engine limit speed and the second engine speed, it is determined that the engine sends a maintain current gear command or a downshift command to the transmission, so as to control the transmission to maintain the current gear based on the maintain current gear command, or to control the transmission to downshift based on the downshift command.

[0007] Optionally, determining the engine correction torque according to the first engine speed and a theoretical downshift speed includes:

[0008] A torque correction factor is determined according to the first engine speed and a theoretical downshift speed, and an engine correction torque is determined according to the torque correction factor.

[0009] Optionally, before determining the engine correction torque according to the torque correction factor, the method further includes:

[0010] Obtaining a reference torque and an actual torque of the engine;

[0011] Determining the engine correction torque according to the torque correction factor includes:

[0012] An engine correction torque is determined based on the reference torque, the actual torque, and the torque correction factor.

[0013] Optionally, determining, according to the engine speed limit and the second engine speed, that the engine sends a current gear maintenance instruction or a downshift instruction to the transmission includes:

[0014] If the engine speed limit is lower than the theoretical downshift speed, continue to determine whether the engine sends a current gear maintenance instruction or a downshift instruction to the transmission according to the engine speed limit and the second engine speed;

[0015] If the engine speed limit is not lower than the theoretical downshift speed, the engine sends a command to maintain the current gear or a downshift command to the transmission according to the second engine speed and the theoretical downshift speed.

[0016] Optionally, continuing to determine, according to the engine speed limit and the second engine speed, that the engine sends a current gear maintenance instruction or a downshift instruction to the transmission includes:

[0017] If the second engine speed is lower than the engine speed limit, determining that the engine sends a downshift instruction to the transmission;

[0018] If the second engine speed is not lower than the engine limit speed, it is determined that the engine sends a command to the transmission to maintain the current gear position.

[0019] Optionally, determining, according to the second engine speed and the theoretical downshift speed, that the engine sends a current gear maintenance instruction or a downshift instruction to the transmission includes:

[0020] If the second engine speed is lower than the theoretical downshift speed, determining that the engine sends a downshift instruction to the gearbox;

[0021] If the second engine speed is not lower than the theoretical downshift speed, the engine torque is corrected.

[0022] Optionally, the vehicle downshift control method further includes:

[0023] A slope value of the vehicle in a driving state is obtained, and whether the vehicle is in the vehicle climbing scene is determined according to the slope value.

[0024] According to another aspect of the present invention, a vehicle downshift control device is provided, the vehicle downshift control device comprising:

[0025] a torque correction module, used to obtain a first engine speed of the vehicle, a theoretical downshift speed, and an engine limit speed corresponding to a limit torque of the engine in a vehicle climbing scenario, and determine an engine correction torque according to the first engine speed and the theoretical downshift speed;

[0026] The vehicle downshift control module is used to execute acquisition and control of a second engine speed after the engine increases the engine correction torque, and determine whether the engine sends a maintain current gear command or a downshift command to the transmission based on the engine limit speed and the second engine speed, so as to control the transmission to maintain the current gear based on the maintain current gear command, or to control the transmission to downshift based on the downshift command.

[0027] According to another aspect of the present invention, a vehicle is provided, the vehicle comprising an engine and an AMT gearbox, the vehicle further comprising:

[0028] at least one processor; and,

[0029] a memory communicatively connected to the at least one processor; wherein,

[0030] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the vehicle downshift control method described in any embodiment of the present invention.

[0031] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the vehicle downshift control method described in any embodiment of the present invention when executed.

[0032] The technical solution of the embodiment of the present invention is to obtain the first engine speed, theoretical downshift speed and engine limit speed corresponding to the engine limit torque of the vehicle in the vehicle climbing scene, and determine the engine correction torque according to the first engine speed and theoretical downshift speed; obtain the second engine speed after controlling the engine to increase the engine correction torque, and determine the engine to send a maintain current gear command or a downshift command to the gearbox according to the engine limit speed and the second engine speed, so as to control the gearbox to maintain the current gear based on the maintain current gear command, or control the gearbox to downshift based on the downshift command. The present invention solves the problem that the gear switching of the current vehicle in the climbing scene cannot be well coordinated with the engine torque and the engine performance cannot be fully utilized, and realizes the gear maintenance time in the vehicle climbing scene, reduces the number of gear shifts, and improves the climbing performance and economy.

[0033] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 is a flow chart of a vehicle downshift control method provided according to Embodiment 1 of the present invention;

[0036] Figure 2 is a flow chart of a vehicle downshift control method provided according to a second embodiment of the present invention;

[0037] Figure 3 is a structural schematic diagram of a vehicle downshift control device provided according to Embodiment 3 of the present invention;

[0038] Figure 4 It is a schematic structural diagram of a vehicle for implementing the vehicle downshift control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Embodiment 1

[0042] Figure 1 A flow chart of a vehicle downshift control method is provided for the first embodiment of the present invention. This embodiment is applicable to the case where the engine and the gearbox are coordinated in a climbing scenario. The vehicle downshift control method can be executed by a vehicle downshift control device. The vehicle downshift control device can be implemented in the form of hardware and / or software. The vehicle downshift control device can be configured in various vehicles such as commercial vehicles and passenger vehicles. Figure 1 As shown, the vehicle downshift control method includes:

[0043] S110. In a vehicle climbing scenario, obtain a first engine speed of the vehicle, a theoretical downshift speed, and an engine limit speed corresponding to a limit torque of the engine, and determine an engine correction torque according to the first engine speed and the theoretical downshift speed.

[0044] Among them, the first engine speed is the current engine speed obtained in real time after determining that the vehicle is in a climbing scenario. The first engine speed can be collected using an existing vehicle controller, and this embodiment does not impose any restrictions on this.

[0045] The theoretical downshift speed is the speed value pre-calibrated by the vehicle's gearbox when it leaves the factory. The theoretical downshift speed varies according to different gearbox manufacturers. Optionally, the theoretical downshift speed can be around 1050rpm.

[0046] The engine's limit torque may be understood as the engine's maximum torque, and the engine's limit speed is the lowest speed corresponding to the engine's maximum torque, which is specifically determined by the engine's properties and is not subject to any restriction in this embodiment.

[0047] In the vehicle climbing scene, the vehicle resistance increases and the engine speed decreases. If the first engine speed is lower than the theoretical downshift speed, the gearbox downshift can be triggered. According to the vehicle test, the vehicle speed is lost by about 2km / h for each gear shift on the slope. To avoid the above situation, the engine torque can be increased in time when the first engine speed decreases to avoid the first engine speed being lower than the theoretical downshift speed, thereby avoiding downshifting on the slope and reducing the loss of climbing kinetic energy.

[0048] Specifically, the increased engine correction torque is inversely proportional to the difference between the first engine speed and the theoretical downshift speed. The engine correction torque is calculated as follows:

[0049] Trq cor =Fac*(Trq ref -Trq act )

[0050] Among them, Trq cor Corrected torque for the engine; Trq ref is the reference torque of the engine; Trq act is the actual torque of the engine, and Fac is the torque correction factor.

[0051] It can be known that the engine reference torque is the engine torque that exerts the best torque characteristics of the engine when the first engine speed is equal to the theoretical downshift speed, the engine actual torque is the actual torque output of the engine at this time, and the torque correction factor is obtained by looking up the pre-set MAP table through the difference between the first engine speed and the theoretical downshift speed.

[0052] On the basis of the above embodiment, before the engine and the gearbox are coordinated and controlled in the climbing scene, the driving scene of the vehicle is first judged, that is, whether the vehicle is in the climbing scene. Specifically, the slope value of the vehicle in the driving state is obtained, and the slope value can be obtained by obtaining the message of the slope signal through the vehicle controller, and then parsing the slope signal message. Further, if the slope value is within the slope threshold corresponding to the climbing scene, it is judged that the vehicle is in the vehicle climbing scene. On the contrary, if the slope value is not within the slope threshold corresponding to the climbing scene, it is judged that the vehicle is not in the vehicle climbing scene.

[0053] The slope threshold corresponding to the climbing scene can be calibrated according to the empirical value of the vehicle climbing test, or it can be determined in other ways, and this embodiment does not impose any limitation on this.

[0054] S120, obtaining a second engine speed after the engine is controlled to increase the engine correction torque, and determining that the engine sends a maintain current gear command or a downshift command to the transmission based on the engine limit speed and the second engine speed, so as to control the transmission to maintain the current gear based on the maintain current gear command, or to control the transmission to downshift based on the downshift command.

[0055] Among them, the second engine speed is the current engine speed after the engine is controlled to increase the engine correction torque. The second engine speed can be collected by using an existing vehicle controller, and this embodiment does not impose any restrictions on this.

[0056] According to the engine external characteristic curve, the lowest speed corresponding to the maximum engine torque is not necessarily equal to the downshift speed. If the engine limit speed is lower than the theoretical downshift speed, and the second engine speed is not lower than the engine limit speed, the engine torque can still reach the maximum value and the gear can continue to be maintained in this speed range. In this case, the engine sends a command to the gearbox to maintain the current gear, and the gearbox does not perform a downshift operation.

[0057] If the second engine speed is lower than the engine speed limit, it is determined that the engine sends a downshift command to the gearbox, the engine allows downshifting, and the gearbox can downshift to maintain a high-speed driving position to the maximum extent. In this scenario, the engine fuel consumption rate and the mechanical efficiency of the transmission system are higher than after downshifting, which can effectively improve the economy of the entire vehicle.

[0058] Further, if the engine speed limit is not lower than the theoretical downshift speed, the engine sends a command to maintain the current gear or a downshift command to the gearbox according to the second engine speed and the theoretical downshift speed. Specifically, if the second engine speed is lower than the theoretical downshift speed, the engine sends a downshift command to the gearbox; if the second engine speed is not lower than the theoretical downshift speed, the engine torque is corrected.

[0059] The technical solution of the embodiment of the present invention is to obtain the first engine speed of the vehicle, the theoretical downshift speed, and the engine limit speed corresponding to the engine limit torque in the vehicle climbing scene, and determine the engine correction torque according to the first engine speed and the theoretical downshift speed; obtain the second engine speed after the engine is controlled to increase the engine correction torque, and determine the engine to send a maintain current gear command or a downshift command to the gearbox according to the engine limit speed and the second engine speed, so as to control the gearbox to maintain the current gear based on the maintain current gear command, or control the gearbox to downshift based on the downshift command. The present invention solves the problem that the gear switching of the current vehicle in the climbing scene cannot be well coordinated with the engine torque and the engine performance cannot be fully utilized, and realizes the gear maintenance time in the vehicle climbing scene, reduces the number of gear shifts, and improves the climbing performance and economy.

[0060] Embodiment 2

[0061] Figure 2 This is a flow chart of a vehicle downshift control method provided in Embodiment 2 of the present invention. This embodiment provides an optional implementation method based on the above embodiment. Figure 2 As shown, the vehicle downshift control method includes:

[0062] S210. In a vehicle climbing scenario, obtain a first engine speed of the vehicle, a theoretical downshift speed, and an engine limit speed corresponding to a limit torque of the engine, and determine an engine correction torque according to the first engine speed and the theoretical downshift speed.

[0063] Specifically, a torque correction factor is determined according to the first engine speed and the theoretical downshift speed. Before determining the engine correction torque according to the torque correction factor, a reference torque and an actual torque of the engine are obtained, and the engine correction torque is determined according to the reference torque, the actual torque and the torque correction factor.

[0064] S220: Obtain a second engine speed after controlling the engine to increase the engine correction torque.

[0065] S230, determining whether the engine speed limit is lower than the theoretical downshift speed, if so, executing step S240, if not, executing step S270.

[0066] S240, determining whether the second engine speed is lower than the engine speed limit, if so, executing step S250, if not, executing step S260.

[0067] S250: Determine whether the engine sends a downshift instruction to the transmission.

[0068] Among them, the downshift command is used to control the transmission to perform downshift operations so that the vehicle can perform necessary downshift operations in climbing scenarios.

[0069] S260: Determine whether the engine sends a command to the transmission to maintain the current gear position.

[0070] Among them, the current gear command is used to control the transmission to maintain the current gear unchanged so that the vehicle remains in the gear before the climbing scene.

[0071] In the vehicle climbing scenario, the traditional engine control only responds to the input of the vehicle driver's control of the accelerator pedal, and the gearbox gear control only considers the slope effect, which leads to the problem of many gear shifts on the slope and large kinetic energy loss. Based on this, this embodiment considers increasing the engine correction torque in the vehicle climbing scenario, thereby reducing the engine speed drop, and controlling the gearbox to maintain the gear unchanged when the second engine speed is not lower than the engine limit speed, so as to ensure the high gear maintenance time in the vehicle climbing scenario, reduce the number of gear shifts, and improve the climbing performance and economy.

[0072] S270, determine whether the second engine speed is lower than the theoretical downshift speed, if so, execute step S250, if not, execute step S210.

[0073] The technical solution of the embodiment of the present invention is to achieve the coordinated control of the engine and the gearbox in the vehicle climbing scene. The engine needs to obtain when the gearbox shifts gears, that is, obtain the first engine speed, and by increasing the engine correction torque, reduce the amplitude of the first engine speed drop, control the gearbox shifting, and reduce the number of gear shifting in the climbing scene. In addition, the relationship between the theoretical downshift speed and the minimum speed corresponding to the maximum external torque of the engine is used to determine whether the gearbox is allowed to shift gears. When the gearbox needs to obtain that the current state of the engine has reached the maximum load, that is, the engine limit speed is not lower than the theoretical shift speed, and the second engine speed is lower than the theoretical downshift speed, the engine allows the gearbox to downshift, and the gearbox can downshift.

[0074] Embodiment 3

[0075] Figure 3 This is a schematic diagram of the structure of a vehicle downshift control device provided by Embodiment 3 of the present invention. Figure 3 As shown, the vehicle downshift control device includes:

[0076] The torque correction module 310 is used to obtain the first engine speed of the vehicle, the theoretical downshift speed, and the engine limit speed corresponding to the engine limit torque in the vehicle climbing scenario, and determine the engine correction torque according to the first engine speed and the theoretical downshift speed;

[0077] The vehicle downshift control module 320 is used to execute the acquisition and control of the second engine speed after the engine increases the engine correction torque, and determine whether the engine sends a maintain current gear command or a downshift command to the transmission based on the engine limit speed and the second engine speed, so as to control the transmission to maintain the current gear based on the maintain current gear command, or control the transmission to downshift based on the downshift command.

[0078] Optionally, the engine correction torque is determined according to the first engine speed and the theoretical downshift speed, specifically for:

[0079] A torque correction factor is determined according to the first engine speed and the theoretical downshift speed, and an engine correction torque is determined according to the torque correction factor.

[0080] Optionally, the vehicle downshift control device further includes:

[0081] A torque acquisition module, used for acquiring a reference torque and an actual torque of the engine;

[0082] The engine correction torque is determined based on the torque correction factor, which is specifically used for:

[0083] The engine correction torque is determined based on the reference torque, the actual torque and the torque correction factor.

[0084] Optionally, determining that the engine sends a current gear maintenance instruction or a downshift instruction to the transmission according to the engine limit speed and the second engine speed is specifically used for:

[0085] If the engine speed limit is lower than the theoretical downshift speed, the engine continues to send a command to maintain the current gear or a downshift command to the transmission according to the engine speed limit and the second engine speed;

[0086] If the engine speed limit is not lower than the theoretical downshift speed, the engine sends a command to maintain the current gear or a downshift command to the transmission according to the second engine speed and the theoretical downshift speed.

[0087] Optionally, the engine continues to determine, based on the engine speed limit and the second engine speed, that the engine sends a command to maintain the current gear or a command to downshift to the transmission, specifically for:

[0088] If the second engine speed is lower than the engine speed limit, determining that the engine sends a downshift command to the transmission;

[0089] If the second engine speed is not lower than the engine speed limit, it is determined that the engine sends a command to the transmission to maintain the current gear position.

[0090] Optionally, determining that the engine sends a current gear maintenance instruction or a downshift instruction to the transmission according to the second engine speed and the theoretical downshift speed is specifically used for:

[0091] If the second engine speed is lower than the theoretical downshift speed, determining that the engine sends a downshift command to the transmission;

[0092] If the second engine speed is not lower than the theoretical downshift speed, the engine torque is corrected.

[0093] Optionally, the vehicle downshift control device further includes:

[0094] The scene judgment module is used to obtain the slope value of the vehicle in a driving state, and judge whether the vehicle is in a vehicle climbing scene according to the slope value.

[0095] The vehicle downshift control device provided in the embodiment of the present invention can execute the vehicle downshift control method provided in any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the vehicle downshift control method.

[0096] Embodiment 4

[0097] Figure 4FIG. 4 is a schematic diagram showing a structure of a vehicle 410 that can be used to implement an embodiment of the present invention. Figure 4 As shown, the vehicle 410 also includes at least one processor 411, and a memory connected to the at least one processor 411, such as a read-only memory (ROM 412), a random access memory (RAM 413), etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 411 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM 412) or the computer program loaded from the storage unit 418 to the random access memory (RAM 413). In RAM 413, various programs and data required for the operation of the vehicle 410 can also be stored. The processor 411, ROM 412 and RAM 413 are connected to each other via a bus 414. An I / O (input / output) interface 415 is also connected to the bus 414.

[0098] A number of components in the vehicle 410 are connected to the I / O interface 415, including: an input unit 416, such as a keyboard, a mouse, etc.; an output unit 417, such as various types of displays, speakers, etc.; a storage unit 418, such as a disk, an optical disk, etc.; and a communication unit 419, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 419 allows the vehicle 410 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0099] The processor 411 may be a variety of general and / or dedicated processing components with processing and computing capabilities. Some examples of the processor 411 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 411 performs the various methods and processes described above, such as a vehicle downshift control method.

[0100] In some embodiments, the vehicle downshift control method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 418. In some embodiments, part or all of the computer program may be loaded and / or installed on the vehicle 410 via the ROM 412 and / or the communication unit 419. When the computer program is loaded into the RAM 413 and executed by the processor 411, one or more steps of the vehicle downshift control method described above may be performed. Alternatively, in other embodiments, the processor 411 may be configured to perform the vehicle downshift control method in any other appropriate manner (e.g., by means of firmware).

[0101] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0102] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0103] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0104] To provide interaction with a user, the systems and techniques described herein can be implemented on a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the vehicle. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0105] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0106] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0107] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0108] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle downshift control method, characterized in that: include: In a vehicle climbing scenario, obtaining a first engine speed of the vehicle, a theoretical downshift speed, and an engine limit speed corresponding to a limit torque of the engine, and determining an engine correction torque according to the first engine speed and the theoretical downshift speed; A second engine speed after controlling the engine to increase the engine correction torque is obtained, and according to the engine limit speed and the second engine speed, it is determined that the engine sends a maintain current gear command or a downshift command to the transmission, so as to control the transmission to maintain the current gear based on the maintain current gear command, or to control the transmission to downshift based on the downshift command.

2. The vehicle downshift control method according to claim 1, characterized in that: Determining an engine correction torque according to the first engine speed and a theoretical downshift speed includes: A torque correction factor is determined according to the first engine speed and a theoretical downshift speed, and an engine correction torque is determined according to the torque correction factor.

3. The vehicle downshift control method according to claim 2, characterized in that: Before determining the engine correction torque according to the torque correction factor, the method further includes: Obtaining a reference torque and an actual torque of the engine; Determining the engine correction torque according to the torque correction factor includes: An engine correction torque is determined based on the reference torque, the actual torque, and the torque correction factor.

4. The vehicle downshift control method according to claim 1, characterized in that: Determining, according to the engine limit speed and the second engine speed, that the engine sends a current gear maintenance instruction or a downshift instruction to the transmission, comprises: If the engine speed limit is lower than the theoretical downshift speed, continue to determine whether the engine sends a current gear maintenance instruction or a downshift instruction to the transmission according to the engine speed limit and the second engine speed; If the engine speed limit is not lower than the theoretical downshift speed, the engine sends a command to maintain the current gear or a downshift command to the transmission according to the second engine speed and the theoretical downshift speed.

5. The vehicle downshift control method according to claim 4, characterized in that: Continuing to determine, according to the engine limit speed and the second engine speed, that the engine sends a current gear maintenance instruction or a downshift instruction to the transmission, comprising: If the second engine speed is lower than the engine speed limit, determining that the engine sends a downshift instruction to the transmission; If the second engine speed is not lower than the engine limit speed, it is determined that the engine sends a command to the transmission to maintain the current gear position.

6. The vehicle downshift control method according to claim 4, characterized in that: Determining, according to the second engine speed and the theoretical downshift speed, that the engine sends a current gear maintaining instruction or a downshift instruction to the transmission, comprises: If the second engine speed is lower than the theoretical downshift speed, determining that the engine sends a downshift instruction to the gearbox; If the second engine speed is not lower than the theoretical downshift speed, the engine torque is corrected.

7. The vehicle downshift control method according to claim 1, characterized in that: The vehicle downshift control method further includes: A slope value of the vehicle in a driving state is obtained, and whether the vehicle is in the vehicle climbing scene is determined according to the slope value.

8. A vehicle downshift control device, characterized in that: include: a torque correction module, used to obtain a first engine speed of the vehicle, a theoretical downshift speed, and an engine limit speed corresponding to a limit torque of the engine in a vehicle climbing scenario, and determine an engine correction torque according to the first engine speed and the theoretical downshift speed; The vehicle downshift control module is used to execute acquisition and control of a second engine speed after the engine increases the engine correction torque, and determine whether the engine sends a maintain current gear command or a downshift command to the transmission based on the engine limit speed and the second engine speed, so as to control the transmission to maintain the current gear based on the maintain current gear command, or control the transmission to downshift based on the downshift command.

9. A vehicle, characterized in that: The vehicle comprises an engine and an AMT gearbox, and the vehicle further comprises: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the vehicle downshift control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the vehicle downshift control method according to any one of claims 1 to 7 when executed.

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