A method, device, equipment and medium for gear shifting control of an automatic gearbox

Abstract

The application provides a gear shifting control method, device, equipment and medium of an automatic gearbox. When it is determined that a gear shifting operation is performed on a vehicle, a driving motor is controlled to clear a torque; the torque of the driving motor is controlled to change from a current torque to a first torque and then to a second torque, and during the torque change process of the driving motor, the automatic gearbox is controlled to be shifted out; when the gear shifting operation is upshift, the first torque is a positive torque and the second torque is a negative torque; when the gear shifting operation is downshift, the first torque is a negative torque and the second torque is a positive torque. During the torque change process, the gears of an input shaft and the gears of an output shaft are misaligned by a certain gap, and the acting force between the input shaft and the output shaft is reduced, so that the automatic gearbox is controlled to be shifted out during the torque change process, the gear shifting out can be performed when there is a certain gap between the gears, the relative movement between the gears is considered, the gear shifting out force is reduced, the gear shifting out success rate is increased, and the user driving experience is improved.

Description

Technical Field

[0001] This application relates to the field of automotive control, and in particular to a method, device, equipment and medium for disengaging an automatic transmission. Background Technology

[0002] An automatic transmission (AT) is a transmission device that can automatically shift gears based on vehicle speed and engine speed. During gear shifting, if the vehicle speed changes significantly, the force between the input and output shafts will be too great, which will affect disengaging the gear and thus affect the success rate of gear shifting.

[0003] For Automated Mechanical Transmission (AMT), the existing AMT control directly reduces the torque to 0 or to a certain target value during the torque clearing stage, and then directly disengages the gear. The success rate of disengaging the gear is relatively low, which affects the user's driving experience. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a method, device, equipment, and medium for disengaging an automatic transmission, which takes into account the relative motion between gears, reduces the disengaging force between gears, thereby increasing the disengagement success rate and improving the user's driving experience. The specific solution is as follows:

[0005] On one hand, this application provides a method for disengaging an automatic transmission, the method comprising:

[0006] When it is determined that a gear shifting operation is to be performed on the vehicle, the drive motor is cleared of torque.

[0007] The torque of the drive motor is controlled to change from the current torque to a first torque, and then to a second torque. During the torque change of the drive motor, the automatic transmission is controlled to disengage. When the shift operation is upshifting, the first torque is positive and the second torque is negative. When the shift operation is downshifting, the first torque is negative and the second torque is positive.

[0008] In another aspect, embodiments of this application also provide an automatic transmission shift control device, the device comprising:

[0009] The first control unit is used to control the drive motor to clear torque when it is determined that a gear shifting operation is to be performed on the vehicle.

[0010] The second control unit is used to control the torque of the drive motor to change from the current torque to a first torque, and then to a second torque, and to control the automatic transmission to disengage during the torque change of the drive motor; when the shift operation is upshifting, the first torque is positive and the second torque is negative; when the shift operation is downshifting, the first torque is negative and the second torque is positive.

[0011] In another aspect, embodiments of this application provide a computer device, the computer device including a processor and a memory:

[0012] The memory is used to store program code and transmit the program code to the processor;

[0013] The processor is used to execute the methods described above according to the instructions in the program code.

[0014] In another aspect, embodiments of this application provide a computer-readable storage medium for storing a computer program for performing the methods described above.

[0015] This application provides a method, apparatus, device, and medium for disengaging an automatic transmission. When a gear shift operation is determined to be performed on a vehicle, the drive motor is controlled to clear torque. The torque of the drive motor is controlled to change from the current torque to a first torque, and then to a second torque. During the torque change of the drive motor, the automatic transmission is controlled to disengage. When the gear shift operation is upshifting, the first torque is positive and the second torque is negative; when the gear shift operation is downshifting, the first torque is negative and the second torque is positive. In other words, this application controls the change of the drive motor torque. During the torque change, a certain gap is created between the input shaft gear and the output shaft gear, reducing the force between the input and output shafts. Therefore, the automatic transmission is controlled to disengage during the torque change. This allows disengagement to occur when there is a certain gap between the gears, taking into account the relative movement between the gears and reducing the disengagement force, thereby increasing the disengagement success rate and improving the user's driving experience. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1A schematic flowchart of an automatic transmission disengagement control method provided in an embodiment of this application is shown;

[0018] Figure 2 This application provides a schematic diagram of a vehicle structure according to an embodiment.

[0019] Figure 3 This illustration shows a schematic diagram of the relative positions of gears during disengagement, according to an embodiment of this application.

[0020] Figure 4 A schematic diagram of an automatic transmission shifting process provided in an embodiment of this application is shown;

[0021] Figure 5 A structural block diagram of an automatic transmission disengagement control device provided in an embodiment of this application;

[0022] Figure 6 This is a structural diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0025] Secondly, this application provides a detailed description in conjunction with schematic diagrams. When detailing the embodiments of this application, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this application. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0026] For ease of understanding, the following detailed description, in conjunction with the accompanying drawings, provides an embodiment of an automatic transmission shift control method, apparatus, device, and medium provided in this application.

[0027] refer to Figure 1 The diagram shown is a flowchart illustrating an automatic transmission disengagement control method provided in an embodiment of this application. The method may include the following steps.

[0028] S101 controls the drive motor to clear torque when it is determined that a gear shifting operation is to be performed on the vehicle.

[0029] In this embodiment, it can be determined whether to perform a gear shifting operation on the vehicle. For example, when the vehicle's speed and acceleration meet the shifting requirements, a gear shift can be performed. AMT gear shifting mainly consists of four processes: torque clearing, disengaging, speed adjustment, and engaging. At this time, the drive motor can be controlled to clear the torque, either by resetting the torque to zero or reducing the torque to a certain value.

[0030] refer to Figure 2 The diagram shown is a schematic of a vehicle structure provided in an embodiment of this application. The drive motor is connected to the input shaft of the AMT gearbox and transmits power to the wheels of the vehicle through the output shaft to realize the gear shifting process.

[0031] S102 controls the torque of the drive motor to change from the current torque to a first torque, and then to a second torque. During the torque change of the drive motor, the automatic transmission is disengaged. When the shift operation is upshifting, the first torque is positive and the second torque is negative. When the shift operation is downshifting, the first torque is negative and the second torque is positive.

[0032] In this embodiment, the torque of the drive motor can be controlled to change from the current torque. During the torque change, the clearance between the gears on the input and output shafts also changes, so that the input and output shafts do not contact or the contact force is relatively small, thus performing the disengagement operation. The AMT actuator can be responsible for disengagement and gear shifting operations.

[0033] AMT actuators can be driven in four ways: electric, pneumatic, hydraulic, and hybrid. Electric actuators use small electric motors, pneumatic actuators use cylinders, and hydraulic actuators use oil cylinders. Hybrid actuators use all of these power drive devices simultaneously within the same AMT system.

[0034] Specifically, during an upshift, the vehicle speed gradually increases, requiring a higher gear to match the speed. At this time, the first torque is positive, and the second torque is negative. (Refer to...) Figure 3 The diagram shown is a schematic representation of the relative positions of gears during the disengagement process according to an embodiment of this application. The gear on the input shaft is denoted as the target gear, and the gear on the output shaft is denoted as the disengagement gear. Figure 3 (1) and (3) in the diagram represent the state of inter-tooth contact. Figure 3 (2) in the text represents the state where the teeth are not in contact.

[0035] When upshifting a vehicle, the gear on the input shaft pushes the gear on the output shaft. After torque clearing, the gears are generally in the following state: Figure 3 In state (3), the upper edges of the target tooth and the disengagement tooth are in contact, affecting disengagement, and may also be in a state of disengagement. Figure 3 In state (2), the target tooth and the de-blocking tooth are not in contact.

[0036] By controlling the drive motor to change from the current torque to positive torque, a closer contact can be made between one side of the target gear and the disengaged gear. This is especially beneficial when shifting gears. Figure 3 In state (3), the two will be in closer contact. If the gear shift is in the state of (3), the two will be in closer contact. Figure 3 In state (2), the gap between the upper edge of the target tooth and the de-blocking tooth will become smaller, and the gap between the lower edge of the target tooth and the de-blocking tooth will become larger. In short, it can make the gap between the lower edge of the target tooth and the de-blocking tooth larger, prevent the output shaft and the input shaft from not fitting tightly, and increase the activity space of the de-blocking tooth.

[0037] Next, by controlling the drive motor to change from positive torque to negative torque, the gap between the upper edge of the target tooth and the disengagement tooth increases, while the gap between the lower edge of the target tooth and the disengagement tooth decreases. As a result, the target tooth and the disengagement tooth can not contact each other, or only make slight contact with each other with a small contact force.

[0038] In other words, when performing an upshift operation, the drive motor can first change from its current torque to positive torque to ensure that one side of the disengagement gear and the target gear are in contact. Then, it can change to negative torque to separate the disengagement gear and the target gear. This allows the disengagement operation to be performed when the two gears are not in contact or the contact force is small. At this time, the disengagement force between the input shaft and the output shaft is small, which can improve the success rate of disengagement.

[0039] When downshifting, the first torque can be negative, and the second torque can be positive. Specifically, during a downshift, after torque clearing, the gear phase positions of the input and output shafts are generally as follows: Figure 3 In state (1), the lower edges of the target tooth and the disengagement tooth are in contact, affecting disengagement. In a few cases, it may be in a state where... Figure 3 In state (2), the target tooth and the de-blocking tooth are not in contact.

[0040] By controlling the drive motor to change from the current torque to negative torque, a closer contact can be made between one side of the target gear and the disengaged gear. This is especially beneficial when shifting gears. Figure 3 In state (1), the two will be in closer contact. If the gear shift is in the (1) state, the two will be in closer contact. Figure 3 In state (2), the gap between the lower edge of the target tooth and the de-blocking tooth will become smaller, and the gap between the upper edge of the target tooth and the de-blocking tooth will become larger. In short, it can make the gap between the upper edge of the target tooth and the de-blocking tooth larger, prevent the output shaft and the input shaft from not fitting tightly, and increase the activity space of the de-blocking tooth.

[0041] By controlling the drive motor to change from negative torque to positive torque, the gap between the lower edge of the target tooth and the disengagement tooth increases, while the gap between the upper edge of the target tooth and the disengagement tooth decreases. As a result, the target tooth and the disengagement tooth can not contact each other, or only make slight contact with each other with a small contact force.

[0042] In other words, when performing a downshift, the drive motor can first change from its current torque to negative torque to ensure that one side of the disengagement gear and the target gear are in contact. Then, it can be changed to positive torque to separate the disengagement gear and the target gear. This allows the disengagement operation to be performed when the two gears are not in contact or the contact force is small. At this time, the disengagement force between the input shaft and the output shaft is small, which can improve the success rate of disengagement.

[0043] In summary, by controlling the torque of the drive motor to vary, a certain gap is created between the gears on the input shaft and the gears on the output shaft during the torque variation process. This reduces the force between the input and output shafts, thereby controlling the automatic transmission to disengage during the torque variation process. Disengagement can be performed when there is a certain gap between the gears, taking into account the relative motion between the gears and reducing the disengagement force between the gears, thus increasing the success rate of disengagement and improving the user's driving experience.

[0044] refer to Figure 4 The diagram shown is a schematic representation of an automatic transmission shifting process according to an embodiment of this application, including a non-shifting process and an upshifting process. Figure 4 The diagram shows the output shaft speed, drive motor torque, drive motor speed, target speed, shifting process, and changes in the required gear. Figure 4 The dashed part of the motor torque indicates the process of first changing to positive torque and then changing to negative torque, during which the gear disengagement operation is performed.

[0045] In one possible implementation, S102 can specifically involve controlling the torque of the drive motor to change from the current torque to a first torque, and then to a second torque. During the torque change of the drive motor, when the rate of change of the speed of the input shaft of the automatic transmission is greater than the preset rate of change of speed, the automatic transmission is controlled to disengage.

[0046] To increase the success rate of disengaging the automatic transmission at a more appropriate time, the rate of change of the input shaft speed can be determined. A preset rate of change of speed can be set, which represents the rate of change of the automatic transmission speed when disengaging the transmission is possible. The preset rate of change of speed abs(a) can be set by the user, for example, to 30 rpm / 10 ms.

[0047] Specifically, if the rate of change of the input shaft speed is small, it indicates that the inter-tooth force between the input and output shafts is relatively large, causing the speed to be unable to change quickly. Therefore, during the torque change of the drive motor, if the rate of change of the input shaft speed of the automatic transmission is greater than the preset rate of change of the speed, it indicates that the inter-tooth force between the input and output shafts is small, the clearance between the gears of the input and output shafts is large enough, and the inter-tooth clearance has been opened up. This allows the automatic transmission to be controlled to disengage, thereby further increasing the success rate of disengaging.

[0048] Furthermore, when changing the first torque to the second torque, it is also possible to determine whether the rate of change of the input shaft speed is less than the rate of change of the target speed. If so, the torque is controlled to change to the second torque, so that the torque change is performed at the appropriate time.

[0049] In one possible implementation, prior to S102, the vehicle acceleration at the moment the gear shift operation is determined can be obtained, and a first torque corresponding to the vehicle acceleration can be determined based on the vehicle acceleration.

[0050] Specifically, when it is determined that a gear shift is required, the vehicle's acceleration can be obtained. The greater the absolute value of the vehicle's acceleration, the greater the absolute value of the first torque. That is, the absolute value of the first torque and the absolute value of the vehicle's acceleration are positively correlated, which makes the torque change process smoother and more reasonable, avoiding large fluctuations in torque when it changes from the current torque to the first torque, thereby improving the success rate of shifting gears.

[0051] Referring to the table below, the vehicle's acceleration before shifting gears is -4000 mm / s². 2 At that time, the speed-regulating torque (i.e., the first torque) can be 20 Nm, and the vehicle's acceleration is -3000 mm / s². 2 When the speed regulation torque is 15 Nm.

[0052]

[0053] Specifically, the absolute values ​​of the first torque and the second torque can be set to be equal. That is, after determining the first torque, its opposite value is taken as the second torque, thereby simplifying the process of determining the second torque and enabling the determination of a more reasonable second torque.

[0054] In one possible implementation, when the torque of the drive motor reaches a preset torque and the difference between the speed of the drive motor and the target speed is less than a preset difference, it indicates that the current state of the vehicle can enter the next gear, and the automatic transmission can be controlled to engage the gear to complete the gear shifting process.

[0055] In this embodiment, when an upshift operation is triggered, the vehicle acceleration at that time can be recorded to determine the corresponding first torque based on the vehicle acceleration. A torque clearing operation is then performed, controlling the drive motor torque to change from the current torque to the first torque. It is also determined whether the rate of change of the input shaft speed is lower than the target rate of change, for example, abs(a) < 5 rpm / 10 ms, thereby maintaining the tooth clearance at a certain level. Figure 3 In state (3), the opposite of the first torque is taken as the second torque. When the speed change rate of the input shaft is greater than the preset speed change rate, such as abs(a)>30rpm / 10ms, the tooth clearance is adjusted so that the tooth clearance passes through the state. Figure 3 In state (2), the gear disengagement operation is performed to ensure the success rate of gear disengagement.

[0056] This application provides a method for disengaging an automatic transmission. When a gear shift is determined, the method controls the drive motor to clear torque; the torque of the drive motor is controlled to change from the current torque to a first torque, and then to a second torque, and the automatic transmission is disengaged during the torque change process. When the gear shift is upshifting, the first torque is positive and the second torque is negative; when the gear shift is downshifting, the first torque is negative and the second torque is positive. In other words, this application controls the change of the drive motor torque. During the torque change process, a certain gap is created between the input shaft gear and the output shaft gear, reducing the force between the input and output shafts. This allows the automatic transmission to disengage during the torque change process, enabling disengagement when there is a certain gap between the gears. By considering the relative movement between the gears, the disengagement force is reduced, thereby increasing the disengagement success rate and improving the user's driving experience.

[0057] Based on the above-described automatic transmission disengagement control method, this application also provides an automatic transmission disengagement control device, see reference. Figure 5 The diagram shown is a structural block diagram of an automatic transmission shift control device according to an embodiment of this application. The device may include:

[0058] The first control unit 201 is used to control the drive motor to clear torque when it is determined that a gear shifting operation is to be performed on the vehicle.

[0059] The second control unit 202 is used to control the torque of the drive motor to change from the current torque to a first torque, and then to a second torque, and to control the automatic transmission to disengage during the torque change of the drive motor; when the shift operation is upshifting, the first torque is positive and the second torque is negative; when the shift operation is downshifting, the first torque is negative and the second torque is positive.

[0060] Specifically, the second control unit is used for:

[0061] The torque of the drive motor is controlled to change from the current torque to the first torque, and then to the second torque. During the torque change of the drive motor, when the rate of change of the speed of the output shaft of the automatic transmission is greater than the preset rate of change of speed, the automatic transmission is controlled to disengage.

[0062] Specifically, the device further includes:

[0063] The acquisition unit is used to acquire the vehicle acceleration when it is determined that a gear shifting operation will be performed on the vehicle.

[0064] A determining unit is configured to determine the first torque corresponding to the vehicle acceleration based on the vehicle acceleration; the absolute value of the first torque is positively correlated with the absolute value of the vehicle acceleration.

[0065] Specifically, the absolute values ​​of the first torque and the second torque are equal.

[0066] Specifically, the device further includes:

[0067] The control unit is used to control the automatic transmission to engage gears when the torque of the drive motor reaches a preset torque and the difference between the speed of the drive motor and the target speed is less than a preset difference.

[0068] This application provides an automatic transmission disengagement control device. An acquisition unit controls the drive motor to clear torque when a gear shift is determined. A determination unit controls the drive motor torque to change from a current torque to a first torque, and then to a second torque, controlling the automatic transmission to disengage during the torque change process. When the shift operation is upshifting, the first torque is positive and the second torque is negative; when the shift operation is downshifting, the first torque is negative and the second torque is positive. In other words, this application controls the change in drive motor torque. During the torque change process, a certain gap is created between the input shaft gear and the output shaft gear, reducing the force between the input and output shafts. This allows the automatic transmission to disengage during the torque change process, enabling disengagement when there is a certain gap between the gears. This takes into account the relative movement between the gears, reduces the disengagement force, increases the disengagement success rate, and improves the user's driving experience.

[0069] In another aspect, embodiments of this application provide a computer device, with reference to Figure 6 The diagram shown is a structural diagram of a computer device provided in an embodiment of this application. The computer device includes a processor 310 and a memory 320.

[0070] The memory 320 is used to store program code and transmit the program code to the processor 310;

[0071] The processor 310 is used to execute the method provided in the above embodiments according to the instructions in the program code.

[0072] The computer device may include a terminal device or a server, and the aforementioned apparatus may be configured in the computer device.

[0073] In another aspect, embodiments of this application also provide a storage medium for storing a computer program for executing the methods provided in the above embodiments.

[0074] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by program instructions in hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium can be at least one of the following media: read-only memory (ROM), RAM, magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0075] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0076] The above description is merely a preferred embodiment of this application. Although this application has disclosed preferred embodiments above, it is not intended to limit this application. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this application using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solutions of this application. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this application without departing from the content of the technical solutions of this application shall still fall within the protection scope of the technical solutions of this application.

Claims

1. A method for disengaging an automatic transmission, characterized in that, The method includes: When it is determined that a gear shifting operation is to be performed on the vehicle, the drive motor is cleared of torque. The torque of the drive motor is controlled to change from the current torque to a first torque, and then to a second torque. During the torque change of the drive motor, the automatic transmission is controlled to disengage. When the shift operation is upshifting, the first torque is positive and the second torque is negative. When the shift operation is downshifting, the first torque is negative and the second torque is positive.

2. The method according to claim 1, characterized in that, The control of the drive motor's torque to change from a current torque to a first torque, and then to a second torque, and the control of the automatic transmission to disengage during the torque change of the drive motor, includes: The torque of the drive motor is controlled to change from the current torque to the first torque, and then to the second torque. During the torque change of the drive motor, when the rate of change of the speed of the input shaft of the automatic transmission is greater than the preset rate of change of speed, the automatic transmission is controlled to disengage.

3. The method according to claim 1, characterized in that, Before controlling the automatic transmission to disengage during the process of changing the torque of the drive motor from a current torque to a first torque and then to a second torque, the method further includes: Obtain the vehicle acceleration at the moment when a gear shift operation is determined to be performed on the vehicle; The first torque corresponding to the vehicle acceleration is determined based on the vehicle acceleration; the absolute value of the first torque is positively correlated with the absolute value of the vehicle acceleration.

4. The method according to claim 3, characterized in that, The absolute values ​​of the first torque and the second torque are equal.

5. The method according to claim 1, characterized in that, The method further includes: When the torque of the drive motor reaches the preset torque and the difference between the speed of the drive motor and the target speed is less than the preset difference, the automatic transmission is controlled to engage gears.

6. A disengagement control device for an automatic transmission, characterized in that, The device includes: The first control unit is used to control the drive motor to clear torque when it is determined that a gear shifting operation is to be performed on the vehicle. The second control unit is used to control the torque of the drive motor to change from the current torque to a first torque, and then to a second torque, and to control the automatic transmission to disengage during the torque change of the drive motor; when the shift operation is upshifting, the first torque is positive and the second torque is negative; when the shift operation is downshifting, the first torque is negative and the second torque is positive.

7. The apparatus according to claim 6, characterized in that, The second control unit is used for: The torque of the drive motor is controlled to change from the current torque to the first torque, and then to the second torque. During the torque change of the drive motor, when the rate of change of the speed of the input shaft of the automatic transmission is greater than the preset rate of change of speed, the automatic transmission is controlled to disengage.

8. The apparatus according to claim 6, characterized in that, The device further includes: The acquisition unit is used to acquire the vehicle acceleration when it is determined that a gear shifting operation will be performed on the vehicle. A determining unit is configured to determine the first torque corresponding to the vehicle acceleration based on the vehicle acceleration; the absolute value of the first torque is positively correlated with the absolute value of the vehicle acceleration.

9. A computer device, characterized in that, The computer device includes a processor and memory: The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the method described in any one of claims 1-5 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program for performing the method according to any one of claims 1-5.

Images