A control method, device and equipment for vehicle power-off gear shifting and a medium

Abstract

This application provides a control method, device, equipment, and medium for powerless gear shifting in vehicles, relating to the field of gear shifting control technology. The method includes: acquiring vehicle operating parameters; if the current torque is less than a preset first threshold and the current speed is higher than a preset second threshold, controlling the vehicle to enter a powerless upshifting state; wherein, when the vehicle enters the powerless upshifting state, adjusting the current speed by controlling the change in the current pressure value of the oil drain clutch to complete the gear shift; if the current engine torque is less than a preset first threshold and the current speed is lower than a preset third threshold, controlling the vehicle to enter a powerless downshifting state; wherein, when the vehicle enters the powerless downshifting state, adjusting the current speed by controlling the change in the current pressure value of the engagement clutch to complete the gear shift. This application improves the input shaft speed adjustment rate, shift success rate, and stability by switching the closed-loop control state of the oil drain clutch and the engagement clutch.

Description

Technical Field

[0001] This application relates to the field of gear shifting control technology, and more specifically, to a control method, device, equipment, and medium for unpowered gear shifting in vehicles. Background Technology

[0002] During a vehicle's transmission downshifting without power, the input shaft speed increases to synchronize with the clutch and complete the shift. However, under no-power conditions, the input shaft speed does not actively increase. Current technology does not actively control the input shaft speed; it merely increases the input shaft speed through the engagement of the clutch to achieve the shift. The clutch's function is to increase the input shaft speed to achieve gear change. The higher the clutch pressure, the faster the speed increases. However, if the speed adjustment is still very fast even at the lowest clutch pressure, it is impossible to slow down the shift speed by reducing the clutch pressure. The end result is a short shift time, rapid clutch engagement, and shift jerking.

[0003] During a vehicle's transmission upshift without power, the input shaft speed decreases to synchronize with the clutch engagement and complete the shift. Under these conditions, the input shaft speed gradually decreases as the vehicle speed decreases (due to the resistance torque generated by friction with the ground), eventually achieving synchronized speed for the shift. Current technology transmits this resistance torque to the input end by controlling the pressure of the drain clutch, thus reducing the input shaft speed. Higher drain clutch pressure results in greater transmitted resistance torque and a faster decrease in input shaft speed. However, if the speed adjustment is still very rapid even when the drain clutch reaches its minimum pressure, further reducing the drain clutch pressure cannot slow down the shift speed. This ultimately leads to a short shift time, rapid clutch engagement, and shift jerking. Summary of the Invention

[0004] The purpose of this application is to provide a control method, device, equipment and medium for vehicle gear shifting without power, which solves the problems of poor shifting consistency, severe shifting shock and long shifting time in the prior art. It can achieve normal and stable speed regulation of the input shaft speed by PI control of the clutch control pressure under different shifting conditions (engaged clutch for downshifting without power and oil-draining clutch for upshifting without power).

[0005] Firstly, a method for controlling power-free gear shifting in a vehicle is provided, the method including:

[0006] Obtain the vehicle's operating parameters; wherein the vehicle's operating parameters include: the vehicle's current speed, the engine's current torque, the current speed of the input shaft in the transmission, the current pressure of the engaged clutch, and the current pressure of the drain clutch;

[0007] If the current torque is less than a preset first threshold and the current speed is higher than a preset second threshold, the vehicle is controlled to enter a no-power upshift condition; wherein, when the vehicle enters a no-power upshift condition, the current speed is adjusted by controlling the change in the current pressure value of the oil drain clutch to complete the gear shift.

[0008] If the current engine torque is less than a preset first threshold and the current speed is lower than a preset third threshold, the vehicle is controlled to enter a powerless downshifting mode. When the vehicle enters the powerless downshifting mode, the current speed is adjusted by controlling the change in the current pressure value of the engaged clutch to complete the gear shift.

[0009] In an optional implementation, the operating parameters further include: the target rotational speed of the input shaft in the gearbox;

[0010] When the vehicle enters a no-power upshift condition, the current speed is adjusted by controlling the change in the current pressure value of the oil-draining clutch, including:

[0011] If the current rotational speed is greater than the target rotational speed, then the difference between the current rotational speed and the target rotational speed is determined;

[0012] Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table;

[0013] The current pressure value of the drain clutch is controlled to decrease to the target pressure value of the drain clutch, so that the current speed is the same as the target speed.

[0014] In an optional implementation, controlling the current pressure value of the drain clutch to decrease to the target pressure value of the drain clutch so that the current speed is the same as the target speed includes:

[0015] When the pressure value of the oil drain clutch reaches the preset minimum pressure threshold and the current speed is greater than the target speed, the difference between the current speed and the target speed is determined.

[0016] Based on the determined difference, the target pressure value of the engaged clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table;

[0017] The current pressure value of the engaged clutch is reduced to the target pressure value of the engaged clutch so that the current speed is the same as the target speed.

[0018] In an optional implementation, the method further includes:

[0019] If the current rotational speed is less than the target rotational speed, then the difference between the current rotational speed and the target rotational speed is determined;

[0020] Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table;

[0021] The current pressure value of the drain clutch is increased to the target pressure value of the drain clutch so that the current speed is the same as the target speed.

[0022] In an optional implementation, when the vehicle enters a powerless downshifting condition, the current engine speed is adjusted by controlling the change in the current pressure value of the engaged clutch, including:

[0023] If the current rotational speed is greater than the target rotational speed, then the difference between the current rotational speed and the target rotational speed is determined;

[0024] Based on the determined difference, the target pressure value of the engaged clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table;

[0025] The current pressure value of the engaged clutch is reduced to the target pressure value of the engaged clutch so that the current speed is the same as the target speed.

[0026] In an optional implementation, controlling the current pressure value of the engaged clutch to decrease to a target pressure value of the engaged clutch, so that the current rotational speed is the same as the target rotational speed, includes:

[0027] When the pressure value of the engaged clutch reaches the preset minimum pressure threshold and the current speed is greater than the target speed, the difference between the current speed and the target speed is determined.

[0028] Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table;

[0029] The current pressure value of the drain clutch is controlled to decrease to the target pressure value of the drain clutch, so that the current speed is the same as the target speed.

[0030] In an optional implementation, the method further includes:

[0031] If the current rotational speed is less than the target rotational speed, then the difference between the current rotational speed and the target rotational speed is determined;

[0032] Based on the determined difference, the target pressure value of the engaged clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table;

[0033] The current pressure value of the engaged clutch is increased to the target pressure value of the engaged clutch so that the current speed is the same as the target speed.

[0034] Secondly, a control device for non-powered gear shifting in a vehicle is provided, the device comprising:

[0035] The acquisition unit is used to acquire the vehicle's operating parameters; wherein, the vehicle's operating parameters include: the vehicle's current speed, the engine's current torque, the current speed of the input shaft in the transmission, the current pressure of the engaged clutch, and the current pressure of the drain clutch;

[0036] The upshift control unit is used to control the vehicle to enter a no-power upshift condition when the current torque is less than a preset first threshold and the current speed is higher than a preset second threshold; wherein, when the vehicle enters the no-power upshift condition, the current speed is adjusted by controlling the change of the current pressure value of the oil drain clutch to complete the shift.

[0037] The downshift control unit is used to control the vehicle to enter a powerless downshifting condition when the current engine torque is less than a preset first threshold and the current speed is less than a preset third threshold; wherein, when the vehicle enters the powerless downshifting condition, the current speed is adjusted by controlling the change of the current pressure value of the engaged clutch to complete the gear shift.

[0038] Thirdly, an electronic device is provided, which includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

[0039] Memory, used to store computer programs;

[0040] When a processor executes a program stored in memory, it implements any of the steps described in the first aspect above.

[0041] Fourthly, a computer-readable storage medium is provided, wherein a computer program is stored therein, and when executed by a processor, the computer program implements the steps of any of the methods described in the first aspect above.

[0042] This application achieves improved speed regulation rate and ensures shift success rate and stability by switching the closed-loop control state of the oil drain clutch and the engagement clutch, when the pressure of one clutch is adjusted to the limit pressure, the pressure of the other clutch is adjusted in a closed loop.

[0043] This application addresses the issue of poor shift consistency by employing closed-loop clutch pressure control based on input shaft speed during powerless gear shifting, ensuring speed regulation responsiveness and accuracy. Furthermore, it resolves the problems of shift shock and prolonged shifting time caused by the inability to properly change gears during shifting, through precise switching of the engagement / discharge clutch control pressure using PI control. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A flowchart of a vehicle gear shifting control method provided in this application embodiment;

[0046] Figure 2 This application provides a schematic diagram of a non-powered upshift control.

[0047] Figure 3 This is a schematic diagram of a non-powered upshift control method provided in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of a non-powered downshift control provided in an embodiment of this application;

[0049] Figure 5 This is a schematic diagram of a non-powered downshift control method provided in an embodiment of this application;

[0050] Figure 6 This is a schematic diagram of the structure of a vehicle gear shifting control device provided in an embodiment of this application;

[0051] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0053] Automatic transmissions include OG clutches (also known as off-going clutches or release clutches) and OC clutches (also known as on-coming clutches); OG clutches are off-going clutches, and OC clutches are on-coming clutches.

[0054] The vehicle powerless gear shifting control method provided in this application can be applied to a server or a terminal with strong computing power. The server can be a physical server, a server cluster composed of multiple physical servers, or a distributed system. It can also be a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDNs), and big data and artificial intelligence platforms. The terminal can be a user equipment (UE) such as a mobile phone, smartphone, laptop, digital radio receiver, personal digital assistant (PDA), tablet computer (PAD), handheld device, in-vehicle device, wearable device, computing device, or other processing device connected to a wireless modem, mobile station (MS), mobile terminal, etc. The terminal and server can be directly or indirectly connected via wired or wireless communication methods, which is not limited herein.

[0055] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application. Furthermore, the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0056] Figure 1 This is a flowchart illustrating a control method for non-powered gear shifting in a vehicle, as provided in an embodiment of this application. Figure 1 As shown, the method may include:

[0057] Step S110: Obtain the vehicle's operating parameters; determine whether the current engine torque is less than a preset first threshold, and determine whether the current vehicle speed is higher than a preset second threshold or lower than a preset third threshold.

[0058] In this embodiment, the vehicle includes at least a hydraulic automatic transmission and a generator; the vehicle's operating parameters include: the vehicle's current speed, the engine's current torque, the current and target rotational speeds of the input shaft in the transmission, the current pressure of the engaged clutch, and the current pressure of the drain clutch.

[0059] In this embodiment of the application, the target rotational speed of the input shaft in the gearbox can be obtained by multiplying the current rotational speed of the output shaft by the speed ratio.

[0060] In this embodiment, the first threshold can be set to 1 or 0; specifically, when the current engine torque is less than the preset first threshold, i.e. the throttle is 0 or negative, the vehicle is in a state of no power.

[0061] Step S120: If the current torque is less than the preset first threshold and the current speed is higher than the preset second threshold, then control the vehicle to enter the no-power upshift condition.

[0062] In this embodiment, as the gear ratio decreases, the target speed of the input shaft in the target gear is lower than the current speed. During gear shifting, it is necessary to reduce the current speed of the input shaft to achieve the shift. This application adjusts the current speed by controlling the change in the current pressure value of the drain clutch. When the current pressure value of the drain clutch decreases to a preset minimum pressure threshold but still cannot reduce the current speed of the input shaft to the target speed, the gear shift speed is adjusted by adjusting the pressure of the engaged clutch, and the gear shift is finally completed.

[0063] In this embodiment of the application, when the vehicle enters a no-power upshift condition, the current speed is adjusted by controlling the change in the current pressure value of the oil-draining clutch, including:

[0064] like Figure 2 As shown in D, if the current speed is greater than the target speed, the difference between the current speed and the target speed is determined. Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from a pre-built pressure and speed difference table. The current pressure value of the drain clutch is reduced to the target pressure value of the drain clutch through PI control, so that the current speed quickly approaches the target speed. However, when the pressure value of the drain clutch reaches a preset minimum pressure threshold (e.g., ...), ... Figure 2 When the current speed is greater than the target speed (at point b in the diagram), it is impossible to increase the current speed of the input shaft by reducing the pressure value of the drain clutch. Therefore, the control object is switched, and the current pressure value of the engagement clutch is reduced to the target pressure value of the drain clutch through PI control. This reduces the pressure of the engagement clutch, thereby reducing the current speed of the input shaft to quickly approach the target speed and finally completing the gear shift control quickly.

[0065] like Figure 2 As shown in C, if the current speed is less than the target speed, the difference between the current speed and the target speed is determined. Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from the pre-built pressure and speed difference table. The current pressure value of the drain clutch is increased to the target pressure value of the drain clutch by PI control, so as to increase the current speed of the input shaft and quickly approach the target speed, thereby realizing gear shifting and gear changing.

[0066] In this embodiment of the application, controlling the current pressure value of the drain clutch to decrease to the target pressure value of the drain clutch, so that the current speed is the same as the target speed, includes:

[0067] When the pressure value of the oil drain clutch reaches the preset minimum pressure threshold and the current speed is greater than the target speed, the difference between the current speed and the target speed is determined; based on the determined difference, the target pressure value of the engagement clutch corresponding to the difference is matched from the pre-built pressure and speed difference table; the current pressure value of the engagement clutch is controlled to decrease to the target pressure value of the engagement clutch so that the current speed is the same as the target speed.

[0068] In this embodiment of the application, the target pressure value of the drain clutch and the target pressure value of the engaged clutch corresponding to each speed difference are stored in a pre-constructed pressure and speed difference table; the correspondence between the above difference and the target pressure value can be determined by simulation or empirical data.

[0069] like Figure 3 As shown, in one embodiment of this application, the unpowered upshift control of a vehicle may include: first, using a speed-based PI controller to control the pressure of the drain clutch, and determining whether the speed change rate of the input shaft exceeds a threshold (i.e., whether the target speed has been reached) and whether the pressure of the drain clutch is less than or equal to a pressure threshold (i.e., whether it is less than or equal to the target pressure value of the drain clutch corresponding to the matching difference in the pressure and speed difference table); if so, using the speed-based PI controller to control the engagement clutch pressure until the speed is reached; otherwise, returning to continue using the speed-based PI controller to control the pressure of the drain clutch until whether the speed change rate of the input shaft exceeds a threshold and the pressure of the drain clutch is less than or equal to the pressure threshold.

[0070] Step S130: If the current engine torque is less than the preset first threshold and the current speed is lower than the preset third threshold, then control the vehicle to enter the no-power downshift condition.

[0071] In this embodiment, when the vehicle enters a powerless downshifting condition, as the gear ratio increases, the target speed of the input shaft of the target gear is greater than the current speed. During the shifting process, it is necessary to increase the current speed of the input shaft to achieve the shift. Therefore, this application adjusts the current speed by controlling the change of the current pressure value of the engaged clutch. When the current pressure value of the engaged clutch decreases to the preset minimum pressure threshold but still cannot reduce the current speed of the input shaft to the target speed, the pressure of the drain clutch is adjusted to achieve gear shift control and finally complete the shift.

[0072] In this embodiment of the application, when the vehicle enters a powerless downshifting condition, the current speed is adjusted by controlling the change in the current pressure value of the engaged clutch, including:

[0073] like Figure 4 As shown in B, if the current speed of the input shaft is greater than the target speed, the difference between the current speed and the target speed is determined. Based on the determined difference, the target pressure value of the engaging clutch corresponding to the difference is matched from a pre-built pressure and speed difference table. The current pressure value of the engaging clutch is reduced to the target pressure value of the engaging clutch through PI control, so that the current speed is the same as the target speed. However, when the pressure value of the engaging clutch reaches a preset minimum pressure threshold (e.g., ...), ... Figure 4 When the current speed is still greater than the target speed (at point a in the diagram), it is impossible to reduce the current speed of the input shaft by reducing the current pressure of the engaged clutch. Therefore, it is necessary to determine the difference between the current speed and the target speed. Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from the pre-built pressure and speed difference table. The control object is switched, and the current pressure value of the drain clutch is reduced to the target pressure value of the drain clutch through PI control so that the current speed is the same as the target speed.

[0074] like Figure 4 As shown in A, if the current speed is less than the target speed, the difference between the current speed and the target speed is determined; based on the determined difference, the target pressure value of the engaging clutch corresponding to the difference is matched from the pre-built pressure and speed difference table; the current pressure value of the engaging clutch is increased to the target pressure value of the engaging clutch by PI control, so that the current speed is quickly increased to the same as the target speed.

[0075] like Figure 5 As shown, in one embodiment of this application, the vehicle's powerless downshift control may include: first, using a speed-based PI controller to control the pressure of the engaged clutch, and determining whether the speed change rate of the input shaft exceeds a threshold (i.e., whether the target speed has been reached) and whether the pressure of the engaged clutch is less than or equal to a pressure threshold (i.e., whether it is less than or equal to the target pressure value of the drain clutch corresponding to the matching difference in the pressure and speed difference table); if so, then using the speed-based PI controller to control the pressure of the drain clutch until the speed is reached; otherwise, returning to continue using the speed-based PI controller to control the pressure of the engaged clutch until whether the speed change rate of the input shaft exceeds a threshold and the pressure of the engaged clutch is less than or equal to a pressure threshold.

[0076] In this embodiment, the preset minimum pressure threshold is to ensure that the drain clutch or engagement clutch can transmit torque normally while guaranteeing the clutch oil pressure responsiveness; specifically, the minimum pressure threshold can be equal to the KP point pressure of the drain clutch or engagement clutch plus the offset value. Here, the KP point of the clutch refers to the piston thrust (or pressure) required for the clutch to overcome the force of the release spring and begin to press the friction plates and steel plates together.

[0077] In this embodiment, the pressure value of the engaged clutch or the drain clutch is adjusted by PI closed-loop control, thereby achieving speed change control of the current speed of the input shaft.

[0078] Corresponding to the above method, embodiments of this application also provide a control device for vehicle powerless gear shifting, such as... Figure 6 As shown, the vehicle's non-powered gear shifting control device includes:

[0079] The acquisition unit 610 is used to acquire the vehicle's operating parameters, including: the vehicle's current speed, the engine's current torque, the current speed of the input shaft in the transmission, the current pressure of the engaged clutch, and the current pressure of the drain clutch.

[0080] The upshift control unit 620 is used to control the vehicle to enter a no-power upshift condition when the current torque is less than a preset first threshold and the current speed is higher than a preset second threshold. When the vehicle enters the no-power upshift condition, the current speed is adjusted by controlling the change in the current pressure value of the oil drain clutch to complete the shift.

[0081] The downshift control unit 630 is used to control the vehicle to enter a powerless downshifting condition when the current engine torque is less than a preset first threshold and the current speed is lower than a preset third threshold. When the vehicle enters the powerless downshifting condition, the current speed is adjusted by controlling the change in the current pressure value of the engaged clutch to complete the gear shift.

[0082] The functions of each functional unit of the vehicle powerless shifting control device provided in the above embodiments of this application can be implemented through the above methods and steps. Therefore, the specific working process and beneficial effects of each unit in the vehicle powerless shifting control device provided in the embodiments of this application will not be repeated here.

[0083] This application also provides an electronic device, such as... Figure 7 As shown, it includes a processor 710, a communication interface 720, a memory 730, and a communication bus 740, wherein the processor 710, the communication interface 720, and the memory 730 communicate with each other through the communication bus 740.

[0084] Memory 730 is used to store computer programs;

[0085] When the processor 710 executes the program stored in the memory 730, it performs the following steps:

[0086] The acquisition unit is used to acquire the vehicle's operating parameters, which include: the vehicle's current speed, the engine's current torque, the current speed of the input shaft in the transmission, the current pressure of the engaged clutch, and the current pressure of the drain clutch.

[0087] The upshift control unit is used to control the vehicle to enter a no-power upshift condition when the current torque is less than a preset first threshold and the current speed is higher than a preset second threshold. When the vehicle enters the no-power upshift condition, the current speed is adjusted by controlling the change in the current pressure value of the oil drain clutch to complete the gear shift.

[0088] The downshift control unit is used to control the vehicle to enter a powerless downshifting mode when the current engine torque is less than a preset first threshold and the current speed is lower than a preset third threshold. When the vehicle enters the powerless downshifting mode, the current speed is adjusted by controlling the change in the current pressure value of the engaged clutch to complete the gear shift.

[0089] The communication bus mentioned above can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0090] The communication interface is used for communication between the aforementioned electronic devices and other devices.

[0091] The memory may include random access memory (RAM) or non-volatile memory (NVM), such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0092] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0093] The implementation methods and beneficial effects of the various components of the electronic device in the above embodiments for solving the problem can be found in [reference needed]. Figure 1 The steps in the illustrated embodiments are used to implement the electronic device. Therefore, the specific working process and beneficial effects of the electronic device provided in this application will not be repeated here.

[0094] In another embodiment provided in this application, a computer-readable storage medium is also provided, which stores instructions that, when executed on a computer, cause the computer to perform any of the vehicle powerless gear shifting control methods described in the above embodiments.

[0095] In another embodiment provided in this application, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute any of the vehicle powerless shifting control methods in the above embodiments.

[0096] Those skilled in the art will understand that the embodiments in this application can be provided as methods, systems, or computer program products. Therefore, the embodiments in this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the embodiments in this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0097] This application describes embodiments of methods, apparatus (systems), and computer program products according to embodiments of this application with reference to flowchart illustrations and / or block diagrams. It will 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 program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0098] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0099] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0100] Although preferred embodiments have been described in this application, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of this application.

[0101] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of the embodiments of this application. Therefore, if these modifications and variations to the embodiments of this application fall within the scope of the claims in this application and their equivalents, then this application also intends to include these modifications and variations.

Claims

1. A control method of a vehicle power-off shift characterized by, The method includes: Obtain the vehicle's operating parameters; wherein the vehicle's operating parameters include: the vehicle's current speed, the engine's current torque, the current and target speed of the input shaft in the transmission, the current pressure of the engaged clutch, and the current pressure of the drain clutch; If the current torque is less than a preset first threshold and the current speed is higher than a preset second threshold, the vehicle is controlled to enter a no-power upshift condition. When the vehicle enters the no-power upshift condition, the current speed is adjusted by controlling the change in the current pressure value of the drain clutch to complete the shift. Specifically, this includes: if the current speed is greater than the target speed, determining the difference between the current speed and the target speed; based on the determined difference, matching the target pressure value of the drain clutch corresponding to the difference from a pre-built pressure and speed difference table; and controlling the current pressure value of the drain clutch to decrease to the target speed. The target pressure value of the drain clutch is set to make the current speed the same as the target speed. Controlling the current pressure value of the drain clutch to decrease to the target pressure value includes: when the pressure value of the drain clutch reaches a preset minimum pressure threshold and the current speed is greater than the target speed, determining the difference between the current speed and the target speed; based on the determined difference, matching the target pressure value of the engaged clutch corresponding to the difference from a pre-built pressure and speed difference table; and controlling the current pressure value of the engaged clutch to decrease to the target pressure value of the engaged clutch so that the current speed is the same as the target speed. If the current engine torque is less than a preset first threshold and the current speed is lower than a preset third threshold, the vehicle is controlled to enter a powerless downshifting mode. When the vehicle enters the powerless downshifting mode, the current speed is adjusted by controlling the change in the current pressure value of the engaged clutch to complete the gear shift.

2. The method of claim 1, wherein, The method further includes: If the current rotational speed is less than the target rotational speed, then the difference between the current rotational speed and the target rotational speed is determined; Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table; The current pressure value of the drain clutch is increased to the target pressure value of the drain clutch so that the current speed is the same as the target speed.

3. The method of claim 1, wherein, When the vehicle enters a powerless downshifting condition, the current speed is adjusted by controlling the change in the current pressure value of the engaged clutch, including: If the current rotational speed is greater than the target rotational speed, then the difference between the current rotational speed and the target rotational speed is determined; Based on the determined difference, the target pressure value of the engaged clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table; The current pressure value of the engaged clutch is reduced to the target pressure value of the engaged clutch so that the current speed is the same as the target speed.

4. The method as described in claim 3, characterized in that, Controlling the current pressure value of the engaged clutch to decrease to the target pressure value of the engaged clutch, so that the current speed is the same as the target speed, includes: When the pressure value of the engaged clutch reaches the preset minimum pressure threshold and the current speed is greater than the target speed, the difference between the current speed and the target speed is determined. Based on the determined difference, the target pressure value of the drain clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table; The current pressure value of the drain clutch is controlled to decrease to the target pressure value of the drain clutch, so that the current speed is the same as the target speed.

5. The method of claim 3, wherein, The method further includes: If the current rotational speed is less than the target rotational speed, then the difference between the current rotational speed and the target rotational speed is determined; Based on the determined difference, the target pressure value of the engaged clutch corresponding to the difference is matched from a pre-constructed pressure and speed difference table; The current pressure value of the engaged clutch is increased to the target pressure value of the engaged clutch so that the current speed is the same as the target speed.

6. A control device for vehicle gear shifting without power, characterized in that, The device includes: The acquisition unit is used to acquire the vehicle's operating parameters; wherein, the vehicle's operating parameters include: the vehicle's current speed, the engine's current torque, the current and target speeds of the input shaft in the transmission, the current pressure of the engaged clutch, and the current pressure of the drain clutch; The upshift control unit is used to control the vehicle to enter a no-power upshift condition when the current torque is less than a preset first threshold and the current speed is higher than a preset second threshold. Specifically, when the vehicle enters the no-power upshift condition, the current engine speed is adjusted by controlling the change in the current pressure value of the drain clutch to complete the shift. This includes: if the current engine speed is greater than the target engine speed, determining the difference between the current engine speed and the target engine speed; based on the determined difference, matching the target pressure value of the drain clutch corresponding to the difference from a pre-built pressure and speed difference table; and controlling the current pressure value of the drain clutch to decrease. The current speed is the same as the target speed of the oil drain clutch; controlling the current pressure value of the oil drain clutch to decrease to the target pressure value of the oil drain clutch includes: when the pressure value of the oil drain clutch reaches a preset minimum pressure threshold and the current speed is greater than the target speed, determining the difference between the current speed and the target speed; based on the determined difference, matching the target pressure value of the engagement clutch corresponding to the difference from a pre-built pressure and speed difference table; controlling the current pressure value of the engagement clutch to decrease to the target pressure value of the engagement clutch so that the current speed is the same as the target speed. The downshift control unit is used to control the vehicle to enter a powerless downshifting condition when the current engine torque is less than a preset first threshold and the current speed is less than a preset third threshold; wherein, when the vehicle enters the powerless downshifting condition, the current speed is adjusted by controlling the change of the current pressure value of the engaged clutch to complete the gear shift.

7. An electronic device, comprising: The electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method of any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method described in any one of claims 1-5.

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