Vehicle driving gear control method and system

Abstract

The invention provides a vehicle driving gear control method and system, and belongs to the technical field of vehicles. The vehicle driving gear control method comprises the steps that the speed of a target vehicle is obtained; calculating the rotating speed of a vehicle engine according to the target vehicle speed; in response to the fact that the determined rotating speed of the vehicle engine is lower than a preset minimum rotating speed threshold value, the current target driving gear of the vehicle is set to be a non-engine direct driving gear; and switching the current driving gear of the vehicle to the target driving gear. According to the method, before the actual rotating speed of the vehicle engine is lower than the idle speed, the vehicle driving gear can be switched to the non-engine direct-drive gear in advance, and therefore the situation that the engine is dragged to be shut down due to the too low rotating speed of the engine is effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a method and system for controlling vehicle drive gears. Background Technology

[0002] In related technologies, the vehicle operates in engine direct drive mode, with the engine and wheels connected by fixed gears. This means that the engine speed and vehicle speed are in a fixed ratio. When the vehicle decelerates to a lower speed, the corresponding engine speed is lower than idle speed. The engine may stall abnormally, leading to significant NVH (Noise, Vibration, Harshness) problems, and may even reduce the reliability and lifespan of the vehicle's powertrain hardware. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a vehicle drive gear control method and system.

[0004] In a first aspect, embodiments of the present invention provide a vehicle drive gear control method, comprising:

[0005] Obtain the target vehicle's speed;

[0006] The engine speed of the vehicle is calculated based on the target vehicle speed.

[0007] In response to the determination that the vehicle engine speed is lower than a preset minimum speed threshold, the vehicle's current target drive gear is set to a non-engine direct drive gear;

[0008] Switch the vehicle's current drive gear to the target drive gear.

[0009] Secondly, embodiments of the present invention provide a vehicle drive gear control system, comprising:

[0010] Vehicle speed acquisition unit, used to acquire the speed of the target vehicle;

[0011] An engine speed calculation unit is used to calculate the vehicle engine speed based on the target vehicle speed.

[0012] The target drive gear setting unit is used to set the current target drive gear of the vehicle to a non-engine direct drive gear in response to the determination that the vehicle engine speed is lower than a preset minimum speed threshold.

[0013] The gear shifting unit is used to shift the vehicle's current drive gear to the target drive gear.

[0014] The vehicle drive gear control method provided by this invention calculates the vehicle engine speed by acquiring the target vehicle speed, and determines whether the next target drive gear to be switched needs to be reset by judging whether the calculated vehicle engine speed is lower than a preset minimum speed threshold. When the calculated vehicle engine speed is lower than the preset minimum speed threshold, the current target drive gear is set to a non-engine direct drive gear, thereby switching the vehicle drive gear to a non-engine direct drive gear in advance before the actual vehicle engine speed drops below idle speed. This effectively avoids the vehicle's ECVT transmission operating in engine direct drive gear when the actual vehicle engine speed is lower than idle speed, thereby effectively preventing the engine from stalling due to excessively low engine speed, improving the vehicle's NVH problems, and improving the reliability and lifespan of the vehicle's powertrain hardware. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an ECVT power-split multi-speed hybrid transmission;

[0016] Figure 2 A flowchart illustrating a vehicle drive gear control method provided in an embodiment of the present invention;

[0017] Figure 3 This is a structural block diagram of a vehicle drive gear control system provided in an embodiment of the present invention;

[0018] Figure 4 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0020] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0021] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0022] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0023] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0024] In related technologies, Figure 1 This is a schematic diagram of the structure of an ECVT power-split multi-speed hybrid transmission, as shown below. Figure 1 As shown, the engine flywheel is connected to the planetary carrier of the single planetary gear set; the P1 generator is coaxially connected to the S2 synchronizer hub and sun gear, and the ring gear is connected to two sets of gears with different speed ratios via the left and right sides of the S1 synchronizer, and then connected to the wheels via the differential and half-shaft; the P3 drive motor is also connected to the wheels via the differential and half-shaft with another set of gears. When the S2 synchronizer is in the middle position and the left / right side of the S1 synchronizer is engaged, two ECVT gears with different speed ratios are formed; the left and right sides of the S1 synchronizer and the left and right sides of the S2 synchronizer can be combined in pairs to achieve four engine direct drive gears; when the S2 synchronizer is in the left position and the S1 synchronizer is in the middle position, it is a series gear; when both the S1 and S2 synchronizers are in the middle position, it is neutral, i.e., pure electric EV gear; the shift drum rotates to different positions, controlling the two synchronizers to different positions, corresponding to different gears, and the shift drum positions are executed sequentially, as shown in Table 1.

[0025] Table 1

[0026] Workstation 1 Workstation 2 Workstation 3 Workstation 4 Workstation 5 Workstation 6 Workstation 7 Workstation 8 Workstation 9 Workstation 10 Series gear Direct drive 1st gear ECVT1_1 gear Direct drive 2-speed ECVT 1_2 gears EV ECVT2_1 gear Direct drive 3-speed ECVT2_2 gear Direct drive 4-speed

[0027] After research and experimentation, the inventors discovered that when the vehicle is in engine direct drive 1 / 2 / 3 / 4 gear, the engine and wheels are connected by fixed gears, meaning that the engine speed and vehicle speed are in a fixed ratio. When the vehicle decelerates to a lower speed, the corresponding engine speed is lower than the idle speed, and the engine will be abnormally stalled, resulting in obvious NVH (Noise, Vibration, Harshness) problems.

[0028] To address the aforementioned issues, the inventors conducted further in-depth research. Based on the kinematic characteristics of a single planetary gearbox, the engine, P1 generator, and ring gear speeds in ECVT mode satisfy the relationship n. P1 +K×n r =(1+K)n e , where n r n is the rotational speed of the gear ring. e The engine speed in ECVT mode, n P1 The P1 generator speed is given by the gear ring speed n. r The engine speed n is proportional to the wheel speed, which shows that the engine speed n in ECVT gear is proportional to the wheel speed. e The rotational speed is not fixed and is independent of the wheel speed, meaning the engine and wheel speeds are decoupled. Furthermore, based on the dynamic characteristics of a single planetary gear set, the torques acting on the planet carrier, sun gear, and ring gear satisfy the relationship T. s :T r :T pc =1 : K :−(1+K ), corresponding to this hybrid transmission, when the ECVT gear is running stably, if the engine is running, the engine torque is input to the planetary carrier, 1 / (1+K) of the engine torque is input to the P1 generator, and the remaining K / (1+K) of the engine torque is transmitted to the wheels through the ring gear and gear system, realizing torque splitting, that is, the engine torque and wheel torque are not decoupled. Therefore, in ECVT gear, the vehicle can generate electricity while stationary, and can also move forward or backward within a large speed range.

[0029] As shown in Table 1, apart from the direct drive 1st gear being a series gear to the left, there is an ECVT gear next to the direct drive gear. As long as the engine speed is lower than the previous gear when shifting from direct drive to series / ECVT gear, the engine can be prevented from stalling.

[0030] Based on the above-mentioned inventive concept, the inventors have proposed a vehicle drive gear control method and system, which aims to improve the technical problem in the above-mentioned related technologies where the engine is abnormally stalled when the vehicle decelerates and the engine speed drops below idle speed while the vehicle is in engine direct drive gear.

[0031] This invention provides a method for controlling vehicle drive gears. Figure 1 This is a flowchart illustrating a vehicle drive gear control method according to an embodiment of the present invention, as shown below. Figure 1 As shown, the vehicle drive gear control method includes:

[0032] Step S11: Obtain the speed of the target vehicle.

[0033] Step S12: Calculate the vehicle engine speed based on the target vehicle speed.

[0034] Step S13: In response to the vehicle engine speed being lower than a preset minimum speed threshold, the vehicle's current target drive gear is set to a non-engine direct drive gear.

[0035] Step S14: Switch the vehicle's current drive gear to the target drive gear.

[0036] According to the vehicle drive gear control method of the present invention, the vehicle engine speed is calculated by acquiring the target vehicle speed, and the vehicle engine speed is determined by judging whether the calculated vehicle engine speed is lower than a preset minimum speed threshold to decide whether it is necessary to reset the next target drive gear to be switched to. When the calculated vehicle engine speed is lower than the preset minimum speed threshold, the current target drive gear of the vehicle is set to a non-engine direct drive gear, thereby achieving the pre-shifting of the vehicle drive gear to a non-engine direct drive gear before the actual vehicle engine speed is lower than idle speed. This effectively avoids the vehicle's ECVT transmission from working in engine direct drive gear when the actual vehicle engine speed is lower than idle speed, thereby effectively preventing the engine from stalling due to excessively low engine speed, improving the vehicle's NVH problem, and improving the reliability and lifespan of the vehicle's powertrain hardware.

[0037] Figure 2 This is a schematic diagram illustrating a method for obtaining the speed of a target vehicle in an embodiment of the present invention. In some embodiments, such as... Figure 2 As shown, in step S11 above, obtaining the target vehicle speed may further include:

[0038] Step S21: Obtain the vehicle acceleration based on the vehicle speed change.

[0039] In some embodiments, obtaining vehicle acceleration based on changes in vehicle speed includes: performing a first-order difference quotient calculation on the changes in vehicle speed and then performing a first-order low-pass filtering to obtain the vehicle acceleration.

[0040] Step S22: Determine whether the vehicle acceleration is less than the preset acceleration threshold. If yes, proceed to step S23; otherwise, proceed to step S26.

[0041] In some embodiments, the preset acceleration threshold is a negative value, and its specific value can be set according to actual needs. The present invention does not impose any special restrictions on this. For example, the preset acceleration threshold can be set to -5kph / s.

[0042] Step S23: In response to the vehicle acceleration being less than a preset acceleration threshold, predict the change in vehicle speed within a set time period based on the vehicle acceleration.

[0043] The predicted change in vehicle speed is the product of the vehicle's acceleration and the set time, which can be set according to the actual situation.

[0044] In some embodiments, a preset time is configured for the vehicle under different braking states. When the vehicle is in a braking state, the preset time is a first time, and when the vehicle is in a non-braking state, the preset time is a second time.

[0045] In some embodiments, before predicting the change in vehicle speed within a set time period based on vehicle acceleration, the vehicle drive gear control method may further include: identifying whether the vehicle's braking system is in a braking state; in response to the braking system being in a braking state, acquiring a first time corresponding to a preset vehicle braking state, the preset time being the first time; and in response to the braking system being in a non-braking state, acquiring a second time corresponding to a preset vehicle non-braking state, the preset time being the second time.

[0046] Understandably, the vehicle speed decreases faster under braking conditions, resulting in a larger negative change in vehicle speed. Consequently, the predicted vehicle speed is smaller, and the calculated engine speed is also smaller, thus enabling earlier engine shutdown protection.

[0047] Therefore, in some embodiments, the first time set in the braking state is longer than the second time set in the non-braking state. The specific time can be configured according to actual needs, and this embodiment of the invention does not impose any special limitations on it. For example, the first time can be set to 800ms, and the second time can be set to 200ms.

[0048] Step S24: Determine the predicted vehicle speed after a set time based on the current vehicle speed and the predicted change in vehicle speed.

[0049] Add the predicted change in speed to the current speed to get the predicted speed of the vehicle after a set time. In other words, the predicted speed is equal to the sum of the current speed and the predicted change in speed.

[0050] Step S25: Determine the predicted vehicle speed as the target vehicle speed, and proceed with step S12.

[0051] Step S26: In response to the vehicle acceleration being greater than or equal to a preset acceleration threshold, the current vehicle speed is taken as the target vehicle speed, and step S12 is executed.

[0052] According to the method of obtaining the target vehicle speed according to the embodiments of the present invention, since the vehicle decelerates quickly when the hybrid vehicle coasts and the driver actively applies the brakes, when the vehicle acceleration is lower than the preset acceleration threshold (e.g., -5kph / s), using the predicted vehicle speed to calculate the engine speed can play a role in performing engine shutdown protection in advance. However, when the vehicle acceleration is greater than or equal to the preset acceleration threshold, it means that the vehicle speed is still relatively fast and there is no need to perform engine shutdown protection in advance. Therefore, directly using the current vehicle speed to calculate the vehicle engine speed can more accurately control the vehicle's gears.

[0053] In some embodiments, in step S12 above, calculating the vehicle engine speed based on the target vehicle speed may further include: determining the vehicle engine speed based on the target vehicle speed, wheel rolling radius, and target gear ratio.

[0054] Based on the relationship between engine speed, vehicle speed, wheel rolling radius, and gear ratio, the engine speed can be obtained by multiplying the target vehicle speed by the target gear ratio and then dividing by the wheel rolling radius. That is, vehicle engine speed = target vehicle speed × target gear ratio ÷ wheel rolling radius.

[0055] In some embodiments, if the vehicle's current drive gear is an engine direct drive gear (e.g., direct drive 1, direct drive 2, direct drive 3, or direct drive 4 in Table 1 above), then the target gear ratio is the gear ratio of the current drive gear. If the vehicle's current drive gear is not an engine direct drive gear (e.g., serial gear or ECVT gear in Table 1 above), and the vehicle's current target drive gear is an engine direct drive gear, then the target gear ratio is the gear ratio of the current target drive gear.

[0056] In this embodiment of the invention, the engine speed calculated by the predicted vehicle speed or the current actual vehicle speed is lower than a threshold to determine whether the engine stall protection is determined, instead of using the actual engine speed. This is because if the engine stall protection is determined by whether the actual engine speed is lower than the threshold, the process will be delayed when the vehicle is in direct drive gear and decelerating rapidly, and the engine may have already stalled due to the delayed action response. However, the method of determining whether the engine stall protection is determined by whether the predicted vehicle speed or the current actual vehicle speed is lower than the threshold can effectively reduce the occurrence of the engine actually stalling due to the delayed action response.

[0057] It should be noted that, in this embodiment of the invention, the current target drive gear is the drive gear that the vehicle is expected to switch to next according to the original rules. For example, if the vehicle is currently running in ECVT1_1 gear, and the vehicle predicts that the next drive gear to switch to is direct drive 2 gear, then the vehicle's current drive gear is ECVT1_1 gear, and the vehicle's current target drive gear is direct drive 2 gear.

[0058] In some embodiments, if the vehicle’s current driving gear is an engine direct drive gear, in step S13 above, setting the vehicle’s current target driving gear to a non-engine direct drive gear includes: setting the vehicle’s current target driving gear to a non-engine direct drive gear adjacent to the current driving gear.

[0059] For example, taking Table 1 above as an example, if the current drive gear is direct drive 1, in Table 1, the non-engine direct drive gears adjacent to direct drive 1 include serial gear and ECVT1_1 gear. In step S13 above, in response to the vehicle engine speed being lower than the preset minimum speed threshold, the current target drive gear can be switched to ECVT1_1 gear or serial gear. Since the vehicle acceleration capability under ECVT1_1 gear is stronger than that under serial gear, ECVT1_1 is preferred.

[0060] Similarly, if the current drive gear is direct drive 2, and the vehicle driving mode is Sport mode, in order to ensure that the vehicle's subsequent power can enter direct drive 1 as quickly as possible, in step S13 above, in response to the vehicle's engine speed being lower than the preset minimum speed threshold, the current target drive gear can be switched to ECVT1_1. If the driving mode is Normal mode or Eco mode, which focuses more on economy and tries to enter a higher gear, then in Normal mode or Eco mode, the current target drive gear can be switched to ECVT1_2.

[0061] Similarly, if the current drive gear is direct drive 3rd gear, then in step S13 above, in response to the vehicle engine speed being lower than the preset minimum speed threshold, the current target drive gear can be switched to ECVT2_1 gear. Similarly, if the current drive gear is direct drive 4th gear, then in step S13 above, in response to the vehicle engine speed being lower than the preset minimum speed threshold, the current target drive gear can be switched to ECVT2_2 gear.

[0062] In some embodiments, if the vehicle's current driving gear is a non-engine direct drive gear and the vehicle's current target driving gear is an engine direct drive gear, in step S13 above, setting the vehicle's current target driving gear to a non-engine direct drive gear includes: setting the vehicle's current target driving gear to a non-engine direct drive gear adjacent to the current target driving gear.

[0063] For example, as shown in Table 1, if the vehicle's current drive gear is ECVT1_1 and the vehicle's current target drive gear is direct drive 2, then in step S13 above, in response to the vehicle's engine speed being lower than a preset minimum speed threshold, the current target drive gear can be switched to ECVT1_1 or ECVT1_2.

[0064] In some embodiments, after step S12 above, the vehicle drive gear control method further includes: in response to the vehicle engine speed being greater than or equal to a preset minimum speed threshold, maintaining the current target drive gear unchanged.

[0065] In some embodiments, if the vehicle's current drive gear is a non-engine direct drive gear and the vehicle's current target drive gear is a non-engine direct drive gear, then the current target drive gear remains unchanged.

[0066] Figure 3 This is a structural block diagram of a vehicle drive gear control system provided in an embodiment of the present invention. The present invention also provides a vehicle drive gear control system, such as... Figure 3 As shown, the vehicle drive gear control system 300 includes:

[0067] The vehicle speed acquisition unit 301 is used to acquire the speed of the target vehicle.

[0068] The engine speed calculation unit 302 is used to calculate the vehicle engine speed based on the target vehicle speed.

[0069] The target drive gear setting unit 303 is used to set the current target drive gear of the vehicle to a non-engine direct drive gear in response to a determined vehicle engine speed being lower than a preset minimum speed threshold.

[0070] The gear shifting unit 304 is used to shift the vehicle's current drive gear to the target drive gear.

[0071] The vehicle drive gear control system of this invention is used to implement the above-described vehicle drive gear control method. For a detailed description of each functional unit in the system, please refer to the relevant description in the above-described vehicle drive gear control method, which will not be repeated here.

[0072] Based on the same inventive concept, embodiments of the present invention also provide an electronic device. Figure 4 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Figure 4As shown, an embodiment of the present invention provides an electronic device including: one or more processors 401, a memory 402, and one or more I / O interfaces 403. The memory 402 stores one or more programs, which, when executed by the one or more processors, cause the one or more processors to implement any of the vehicle drive gear control methods described in the above embodiments; the one or more I / O interfaces 403 are connected between the processor and the memory, configured to enable information interaction between the processor and the memory.

[0073] Among them, processor 401 is a device with data processing capabilities, including but not limited to central processing unit (CPU); memory 402 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); I / O interface (read-write interface) 403 is connected between processor 401 and memory 402, and can realize information interaction between processor 401 and memory 402, including but not limited to data bus (Bus).

[0074] In some embodiments, the processor 401, memory 402, and I / O interface 403 are interconnected via bus 404, and thus connected to other components of the computing device.

[0075] In some embodiments, the one or more processors 401 include a field-programmable gate array.

[0076] This invention also provides a computer-readable medium. The computer-readable medium stores a computer program, which, when executed by a processor, implements the steps of any of the vehicle drive gear control methods described in the above embodiments. The computer-readable storage medium may be volatile or non-volatile.

[0077] This invention also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described vehicle drive gear control method.

[0078] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0079] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0080] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0081] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0082] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0083] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0084] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0085] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0086] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0087] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. A method for controlling vehicle drive gears, characterized in that, include: Obtain the target vehicle's speed; The engine speed of the vehicle is calculated based on the target vehicle speed. In response to the determination that the vehicle engine speed is lower than a preset minimum speed threshold, the vehicle's current target drive gear is set to a non-engine direct drive gear; Switch the vehicle's current drive gear to the target drive gear.

2. The method according to claim 1, characterized in that, The acquisition of the target vehicle speed includes: The vehicle acceleration is obtained based on the vehicle speed change; Determine whether the vehicle acceleration is less than a preset acceleration threshold; In response to the vehicle acceleration being less than a preset acceleration threshold, the change in vehicle speed within a set time period is predicted based on the vehicle acceleration. Based on the current vehicle speed and the predicted change in vehicle speed, determine the predicted vehicle speed after a set time. The predicted vehicle speed is determined as the target vehicle speed.

3. The method according to claim 2, wherein, After determining whether the vehicle acceleration is less than a preset acceleration threshold, the method further includes: In response to the vehicle's acceleration being greater than or equal to a preset acceleration threshold, the vehicle's current speed is taken as the target vehicle speed.

4. The method according to claim 2, wherein, The step of obtaining vehicle acceleration based on changes in vehicle speed includes: The vehicle's speed change is calculated using a first-order difference quotient and then processed by a first-order low-pass filter to obtain the vehicle's acceleration.

5. The method according to claim 2, wherein, Before predicting the change in vehicle speed over a set time period based on the vehicle acceleration, the method further includes: To identify whether the vehicle's braking system is in a braking state; In response to the braking system being in a braking state, a first time corresponding to a preset vehicle braking state is obtained, wherein the preset time is the first time; In response to the braking system being in a non-braking state, a second time corresponding to a preset vehicle non-braking state is obtained, wherein the preset time is the second time.

6. The method according to claim 1, wherein, The step of calculating the vehicle engine speed based on the target vehicle speed includes: The engine speed of the vehicle is determined based on the target vehicle speed, wheel rolling radius, and target gear ratio.

7. The method according to claim 6, wherein, If the vehicle's current driving gear is an engine direct drive gear, then the target gear ratio is the gear ratio of the current driving gear; If the vehicle's current drive gear is a non-engine direct drive gear, and the vehicle's current target drive gear is an engine direct drive gear, then the target gear ratio is the gear ratio of the current target drive gear.

8. The method according to claim 1, wherein, If the vehicle's current drive gear is an engine direct drive gear, setting the vehicle's current target drive gear to a non-engine direct drive gear includes: Set the vehicle's current target drive gear to a non-engine direct drive gear adjacent to the current drive gear.

9. The method according to claim 1, wherein, If the vehicle's current drive gear is a non-engine direct drive gear, and the vehicle's current target drive gear is an engine direct drive gear, setting the vehicle's current target drive gear to a non-engine direct drive gear includes: Set the vehicle's current target drive gear to the non-engine direct drive gear adjacent to the current target drive gear.

10. A vehicle drive gear control system, characterized in that, include: Vehicle speed acquisition unit, used to acquire the speed of the target vehicle; An engine speed calculation unit is used to calculate the vehicle engine speed based on the target vehicle speed. The target drive gear setting unit is used to set the current target drive gear of the vehicle to a non-engine direct drive gear in response to the determination that the vehicle engine speed is lower than a preset minimum speed threshold. The gear shifting unit is used to shift the vehicle's current drive gear to the target drive gear.

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