Control method, device and equipment of electronic control type continuously variable transmission and medium

Abstract

The invention provides a control method, device and equipment of an electric control type continuously variable transmission and a medium. The method comprises the steps that the actual transmission ratio and the target transmission ratio of the electric control type continuously variable transmission are determined in the vehicle running process; if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is larger than a first threshold value, a control signal of a transmission execution motor is determined according to an open-loop control strategy; if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is smaller than or equal to a first threshold value, a control signal of a transmission execution motor is determined according to the deviation and a closed-loop control strategy; and a control signal is sent to a transmission execution motor, so that the transmission execution motor controls the movable disc to move towards a target position, and the target position is the position of the movable disc corresponding to the target transmission ratio. The transmission ratio is accurately controlled by combining an open-loop control strategy and a closed-loop control strategy, and accurate control over the electrically-controlled continuously variable transmission can be achieved without using a driving disc position sensor.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmissions, and in particular relates to a control method, device, equipment and medium for an electronically controlled continuously variable transmission. Background Art

[0002] The transmission ratio of an electronically controlled continuously variable transmission (CVT) can be flexibly controlled based on vehicle operating conditions, improving vehicle power and fuel economy. The transmission controller calculates the CVT's target transmission ratio and, based on this target ratio, the target position of the active disc within the active disc. The controller then controls the motor to propel the active disc to the target position. This process uses the actual position feedback from the active disc position sensor as the target for position control. However, adding an additional active disc position sensor increases costs, while eliminating it altogether makes accurate control of the CVT difficult. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a control method, device, equipment and medium for an electronically controlled continuously variable transmission to solve the above-mentioned problems.

[0004] The control method of the electronically controlled continuously variable transmission provided by the present invention includes:

[0005] During vehicle travel, determining an actual transmission ratio and a target transmission ratio of an electronically controlled continuously variable transmission;

[0006] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold, determining a control signal for the transmission actuator motor according to a preset open-loop control strategy;

[0007] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold, determining a control signal for the transmission actuator motor according to the deviation and a preset closed-loop control strategy;

[0008] The control signal is sent to the transmission actuator motor so that the transmission actuator motor controls the movable disk of the electronically controlled continuously variable transmission to move toward a target position according to the control signal. The target position is the position of the movable disk corresponding to the target transmission ratio.

[0009] In one embodiment of the present invention, after determining the actual transmission ratio and the target transmission ratio of the electronically controlled continuously variable transmission, the method further includes:

[0010] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the first threshold and greater than a second threshold, determining the control signal according to the deviation and the closed-loop control strategy;

[0011] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the second threshold, determining a duration of the deviation being less than or equal to the second threshold;

[0012] If the duration is longer than a preset duration, controlling the transmission execution motor is stopped.

[0013] In one embodiment of the present invention, determining the control signal of the transmission actuator motor according to a preset open-loop control strategy includes:

[0014] determining a driving direction of the transmission actuator motor based on a sign of a deviation between the target transmission ratio and the actual transmission ratio;

[0015] Determining the duty cycle of the transmission actuator motor based on a preset duty cycle variation curve, wherein the duty cycle variation curve is a curve in which the duty cycle gradually decreases as the open-loop control time increases;

[0016] The control signal is determined based on a duty cycle of the transmission actuating motor and a driving direction of the transmission actuating motor.

[0017] In one embodiment of the present invention, determining the target transmission ratio of the electronically controlled continuously variable transmission includes:

[0018] If an engine shutdown signal is received, the target transmission ratio is determined to be the maximum transmission ratio of the electronically controlled continuously variable transmission.

[0019] In one embodiment of the present invention, before determining the actual transmission ratio and the target transmission ratio of the electronically controlled continuously variable transmission, the method further includes:

[0020] If the engine is started, a fault detection instruction is sent to the transmission execution motor, so that the transmission execution motor controls the movable plate to move in a first direction and a second direction in sequence, wherein the first direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to decrease, and the second direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to increase;

[0021] detecting a change in an actual transmission ratio of the electronically controlled continuously variable transmission;

[0022] If the change of the actual transmission ratio does not meet the preset change condition, the control of the transmission execution motor is stopped, and the vehicle is controlled to enter the limp home mode.

[0023] In one embodiment of the present invention, the electronically controlled continuously variable transmission includes a driving disc and a driven disc, and determining the actual transmission ratio of the electronically controlled continuously variable transmission includes:

[0024] If the vehicle includes an engine speed sensor and a driven disc speed sensor, but does not include a driving disc speed sensor, then acquiring the engine speed and the driven disc speed;

[0025] The actual gear ratio is determined based on the engine speed and the driven plate speed.

[0026] In one embodiment of the present invention, determining the actual transmission ratio of the electronically controlled continuously variable transmission further includes:

[0027] If a fault is detected in the driven disc speed sensor, the engine speed and the vehicle speed or wheel speed are obtained;

[0028] If the engine speed, the vehicle speed, or the wheel speed is respectively greater than a corresponding preset threshold, the actual rotation ratio is determined based on the engine speed and the vehicle speed or the wheel speed.

[0029] The control device of the electronically controlled continuously variable transmission provided by the present invention comprises:

[0030] A first determining module is used to determine an actual transmission ratio and a target transmission ratio of the electronically controlled continuously variable transmission during vehicle travel;

[0031] a second determining module, configured to determine a control signal for a transmission actuator motor according to a preset open-loop control strategy if an absolute value of a deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold;

[0032] a third determining module, configured to determine a control signal for a transmission actuator motor according to the deviation and a preset closed-loop control strategy if an absolute value of a deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold;

[0033] The first sending module is used to send the control signal to the transmission execution motor, so that the transmission execution motor controls the movable disk to move toward a target position according to the control signal. The target position is the position of the movable disk corresponding to the target transmission ratio.

[0034] In one embodiment of the present invention, the third determining module is specifically configured to:

[0035] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the first threshold and greater than a second threshold, determining the control signal according to the deviation and the closed-loop control strategy;

[0036] The device further comprises:

[0037] a fourth determining module, configured to determine a duration of time during which the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the second threshold if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the second threshold;

[0038] The first control module is configured to stop controlling the transmission execution motor if the duration is greater than a preset duration.

[0039] In one embodiment of the present invention, the second determining module is specifically configured to:

[0040] determining a driving direction of the transmission actuator motor based on a sign of a deviation between the target transmission ratio and the actual transmission ratio;

[0041] Determining the duty cycle of the transmission actuator motor based on a preset duty cycle variation curve, wherein the duty cycle variation curve is a curve in which the duty cycle gradually decreases as the open-loop control time increases;

[0042] The control signal is determined based on a duty cycle of the transmission actuating motor and a driving direction of the transmission actuating motor.

[0043] In one embodiment of the present invention, the first determining module is specifically configured to:

[0044] If an engine shutdown signal is received, the target transmission ratio is determined to be the maximum transmission ratio of the electronically controlled continuously variable transmission.

[0045] In one embodiment of the present invention, the apparatus further comprises:

[0046] a second sending module, configured to send a fault detection instruction to the transmission execution motor when the engine is started, so that the transmission execution motor controls the movable disk to move in a first direction and a second direction in sequence, wherein the first direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to decrease, and the second direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to increase;

[0047] a fault detection module, configured to detect changes in the actual transmission ratio of the electronically controlled continuously variable transmission;

[0048] The second control module is configured to stop controlling the transmission actuator motor and control the vehicle to enter a limp home mode if a change in the actual transmission ratio does not satisfy a preset change condition.

[0049] In one embodiment of the present invention, the electronically controlled continuously variable transmission includes a driving disc and a driven disc, and the first determining module is further configured to:

[0050] If the vehicle includes an engine speed sensor and a driven disc speed sensor, but does not include a driving disc speed sensor, then acquiring the engine speed and the driven disc speed;

[0051] The actual gear ratio is determined based on the engine speed and the driven plate speed.

[0052] In one embodiment of the present invention, the first determining module is further configured to:

[0053] If a fault is detected in the driven disc speed sensor, the engine speed and the vehicle speed or wheel speed are obtained;

[0054] If the engine speed, the vehicle speed, or the wheel speed is respectively greater than a corresponding preset threshold, the actual rotation ratio is determined based on the engine speed and the vehicle speed or the wheel speed.

[0055] The electronic device provided by the present invention includes:

[0056] one or more processors;

[0057] A storage device is used to store one or more programs, which, when executed by the one or more processors, enable the electronic device to implement the control method of the electronically controlled continuously variable transmission.

[0058] The computer-readable storage medium provided by the present invention stores a computer program thereon. When the computer program is executed by a processor of a computer, the computer is enabled to execute the control method of the electronically controlled continuously variable transmission.

[0059] Beneficial effects of this technical solution: This technical solution obtains the target transmission ratio and the actual transmission ratio, and executes an open-loop control strategy when the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is large, so that the transmission execution motor quickly drives the active disk to move to the target position, thereby quickly making the actual transmission ratio approach the target transmission ratio; when the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is small, a closed-loop control strategy is executed, with the transmission ratio as the target of the closed-loop control, thereby making the actual transmission ratio approach or reach the target transmission ratio, thereby achieving precise control of the electronically controlled continuously variable transmission. It can be seen that by adopting this technical solution, precise control of the electronically controlled continuously variable transmission can be achieved without using an active disk position sensor.

[0060] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and it is clear that a person skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0062] Figure 1 1 is a structural diagram of an electronically controlled continuously variable transmission according to an exemplary embodiment of the present invention.

[0063] Figure 2 This is one of the flow charts of a control method of an electronically controlled continuously variable transmission shown in an exemplary embodiment of the present invention.

[0064] Figure 3 This is a second flowchart of a control method of an electronically controlled continuously variable transmission shown in an exemplary embodiment of the present invention.

[0065] Figure 4 This is a third flowchart of a control method of an electronically controlled continuously variable transmission shown in an exemplary embodiment of the present invention.

[0066] Figure 5 FIG. 1 is a block diagram of a control device for an electronically controlled continuously variable transmission according to an exemplary embodiment of the present invention.

[0067] Figure 6 A schematic structural diagram of a computer system suitable for implementing an electronic device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0068] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments. The details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. The following embodiments and features therein may be combined with one another without conflict.

[0069] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0070] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring the embodiments of the present invention.

[0071] In order to more clearly understand the technical solution of the present invention, the relevant contents of the present invention are first described below.

[0072] Mechanical continuously variable transmissions (CVTs) are widely used in mid- and low-end scooters due to their simple structure, reliable operation, lack of complex electronic control systems, and low cost. Their operating principle is that the engine crankshaft drives the puli beads within the transmission's active disc in circular motion. The centrifugal force of the beads propels the active disc axially, thereby changing the belt drive's transmission ratio and achieving speed change. However, the transmission ratio of a mechanical CVT transmission is primarily determined by engine speed: higher speeds result in lower transmission ratios. This design fails to proactively adjust and optimize the transmission ratio based on the vehicle's actual operating conditions, resulting in suboptimal power and fuel economy.

[0073] To solve the above problems of mechanical continuously variable transmission, electronically controlled continuously variable transmission came into being. The transmission ratio adjustment of electronically controlled continuously variable transmission no longer relies on the centrifugal force of the pulse beam, but is achieved by an actuator motor driving a set of mechanical structures. Figure 1 The mechanical structure can push the movable plate 1 of the gearbox active plate to move axially along the direction of the rotation axis under the drive of the execution motor ( Figure 1 In the direction indicated by the arrow in the middle). When the movable disk 1 of the active disk moves upward, the width of the V-groove 2 of the active disk becomes narrower, forcing the radius of the circle wrapped by the transmission belt 3 on the active disk to increase. Since the length of the transmission belt 3 is fixed, the radius of the circle wrapped by the belt on the driven disk will be forced to decrease, and at the same time, the elastic force of the compression spring at the driven disk needs to be overcome. At this time, the transmission ratio will become smaller. On the contrary, when the movable disk of the active disk moves downward, the width 2 of the V-groove of the active disk becomes wider, the radius of the circle wrapped by the transmission belt 3 on the active disk decreases, while the radius of the circle wrapped on the driven disk increases, thereby achieving the effect of increasing the transmission ratio.

[0074] An electronically controlled continuously variable transmission (CVT) has a new active disc position sensor 4. Specifically, the transmission controller calculates the CVT's target gear ratio and, based on this target gear ratio, the target position of the active disc in the active disc. The controller then controls the motor to propel the active disc to the target position. This process uses the actual position feedback from the active disc position sensor 4 as the target for position control. However, adding the active disc position sensor 4 would increase costs, while eliminating it would make accurate control of the CVT difficult.

[0075] In order to solve the above problems, the present invention provides a control method, device, equipment and medium for an electronically controlled continuously variable transmission.

[0076] Hereinafter, the control method of the electronically controlled continuously variable transmission of the present invention will be described.

[0077] See also Figure 2 , Figure 2 FIG. 1 is a flow chart of a control method of an electronically controlled continuously variable transmission according to an exemplary embodiment of the present invention. Figure 2 As shown, in an exemplary embodiment, the control method of the electronically controlled continuously variable transmission includes steps S210 to S240, which are described in detail as follows:

[0078] Step S210 , determining the actual transmission ratio and the target transmission ratio of the electronically controlled continuously variable transmission during vehicle driving.

[0079] Step S220: If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold, a control signal for the transmission execution motor is determined according to a preset open-loop control strategy.

[0080] Step S230: If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the first threshold, a control signal for the transmission actuator motor is determined according to the deviation and a preset closed-loop control strategy.

[0081] Step S240 , sending a control signal to the transmission actuator motor so that the transmission actuator motor controls the movable plate of the electronically controlled continuously variable transmission to move toward a target position according to the control signal. The target position is the position of the movable plate corresponding to the target transmission ratio.

[0082] In the related art, the above steps require an additional transmission controller to implement. To further reduce costs, the control method for an electronically controlled continuously variable transmission in the embodiments of the present invention can be executed by the engine controller or other existing vehicle controllers, eliminating the need for an additional transmission controller. For ease of understanding, the following description uses an engine controller as an example to illustrate the control method for an electronically controlled continuously variable transmission.

[0083] In step S210, the target transmission ratio may be a transmission ratio calculated in real time based on the current driving mode signal, throttle grip opening signal, engine speed signal, and vehicle speed signal. Figure 2 , the engine controller can receive the above signal and calculate the target transmission ratio in real time.

[0084] The following is an exemplary description of how to calculate the target transmission ratio.

[0085] A throttle grip opening-engine speed-target transmission ratio curve corresponding to each driving mode signal can be calibrated, and the corresponding target transmission ratio can be determined based on the curve and the real-time driving mode signal, throttle grip opening signal, and engine speed signal. For example, the target transmission ratio in the above curve may increase with increasing throttle grip opening; while decreasing with increasing engine speed when the throttle grip opening remains constant.

[0086] The actual transmission ratio can be calculated using the driving disc speed and the driven disc speed. The driving disc speed is obtained by the driving disc speed sensor 5, and the driven disc speed is obtained by the driven disc speed sensor 6. Calculating the actual transmission ratio using the above method requires the installation of both the driving disc speed sensor 5 and the driven disc speed sensor 6, resulting in high costs and hindering the widespread use of electronically controlled continuously variable transmissions on mid- and low-end scooters.

[0087] To address the aforementioned issues, in some embodiments, the driving disc position sensor 5 can be eliminated. The engine crankshaft and the transmission driving disc are coaxially mounted and operate at the same speed. Therefore, the actual transmission ratio can be calculated using the engine speed and the driven disc speed. Furthermore, the engine speed sensor can be used to replace the driving disc speed sensor 5 added in related art. This is described in detail below.

[0088] Optionally, determining an actual transmission ratio of the electronically controlled continuously variable transmission includes:

[0089] If the vehicle includes an engine speed sensor and a driven disc speed sensor, but does not include a driving disc speed sensor, then the engine speed and the driven disc speed are obtained;

[0090] The actual gear ratio is determined based on the engine speed and the driven plate speed.

[0091] In this embodiment, the actual transmission ratio is determined based on the engine speed and the driven disc speed, and there is no need to add a driving disc speed sensor, which is conducive to cost saving.

[0092] Optionally, determining the actual transmission ratio of the electronically controlled continuously variable transmission further includes:

[0093] If a fault is detected in the driven disc speed sensor, the vehicle speed or wheel speed is obtained;

[0094] If the engine speed, vehicle speed or wheel speed is greater than the corresponding preset threshold, the actual rotation ratio is determined based on the engine speed and the vehicle speed or wheel speed.

[0095] In this embodiment, if a fault is detected in the driven disc speed sensor, Fault Mode 1 is entered. If the engine speed, vehicle speed, or wheel speed are each greater than a corresponding preset threshold, the wheel speed and the driven disc speed are generally close. Therefore, the wheel speed can be used in place of the driven disc speed. Since there is a conversion relationship between vehicle speed and wheel speed, the wheel speed can also be calculated from the acquired vehicle speed and then combined with the engine speed to determine the actual transmission ratio.

[0096] The vehicle speed and wheel speed can be obtained via a vehicle speed sensor and a wheel speed sensor, respectively. If the vehicle only has a vehicle speed sensor, the vehicle speed can be directly obtained; if the vehicle only has a wheel speed sensor, the wheel speed can be directly obtained.

[0097] In the case of a fault in the driven disc speed sensor, the embodiment of the present invention can receive a signal from a vehicle speed sensor or a wheel speed sensor and determine the actual rotation ratio in combination with the engine speed, which is beneficial to improving the fault tolerance of the system.

[0098] In step S220, if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than the first threshold, it means that the deviation is large and the target transmission ratio may have changed significantly compared with the target transmission ratio at the previous moment.

[0099] A significant change in the target transmission ratio may be due to a sudden change in driving conditions. This sudden change in driving conditions can cause the drive belt in the electronically controlled continuously variable transmission to slip, which in turn can lead to errors in the actual transmission ratio determined in the above steps. Therefore, if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than the first threshold, an open-loop control strategy can be used to determine the control signal for the transmission's actuator motor, rather than a precise closed-loop control strategy.

[0100] The open-loop control strategy in the embodiment of the present invention means directly controlling the transmission actuator motor without receiving feedback of the actual transmission ratio until the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold.

[0101] In some embodiments, the above-mentioned open-loop control strategy includes determining the driving direction of the transmission execution motor based on the positive or negative deviation between the target transmission ratio and the actual transmission ratio; and then determining the control signal of the transmission execution motor based on the driving direction and the fixed duty cycle.

[0102] In some other embodiments, the above-mentioned execution of the open-loop control strategy includes:

[0103] determining a driving direction of the transmission actuator motor based on the sign of a deviation between the target transmission ratio and the actual transmission ratio;

[0104] Determining the duty cycle of the transmission actuator motor based on a preset duty cycle variation curve, wherein the duty cycle variation curve is a curve in which the duty cycle gradually decreases as the open-loop control time increases;

[0105] The control signal is determined based on a duty cycle of the transmission actuating motor and a driving direction of the transmission actuating motor.

[0106] In this embodiment, the duty cycle variation curve is a pre-calibrated curve, which can be either a continuous curve or a discrete curve. In the duty cycle variation curve, the duty cycle gradually decreases as the open-loop control time increases. Thus, when the transmission actuator motor is driven based on the control signal determined by the open-loop control strategy, the speed gradually decreases as the open-loop control time increases, thereby reducing the speed at which the movable disk moves toward the target position. The target position is the position of the movable disk corresponding to the target transmission ratio.

[0107] The embodiment of the present invention determines the duty cycle of the transmission actuator motor through the above-mentioned duty cycle change curve. In the early stage of open-loop control, a higher duty cycle ensures that the actuator can start quickly and move quickly to the target position; in the later stage of open-loop control, as it approaches the target position, the duty cycle is gradually reduced, which is conducive to a smooth transition.

[0108] In step S230, if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the first threshold, it indicates that the deviation is small and the driving condition may be relatively stable, and a precise closed-loop control strategy can be implemented.

[0109] The closed-loop control strategy in this embodiment of the present invention continuously adjusts the control signal of the transmission actuator motor based on the deviation between the target transmission ratio and the actual transmission ratio fed back in real time, so as to bring the movable disc to or near the target position, thereby reducing the deviation between the target transmission ratio and the actual transmission ratio. As an example, the closed-loop control strategy may employ a PID (Proportional-Integral-Derivative) control strategy.

[0110] In step S240, Figure 3 As shown, after the engine controller determines the control signal, it can send the control signal to the transmission execution motor.

[0111] In an embodiment of the present invention, a target transmission ratio and an actual transmission ratio are obtained, and when the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is large, an open-loop control strategy is executed, so that the transmission execution motor quickly drives the movable plate to move toward the target position, thereby causing the actual transmission ratio to quickly approach the target transmission ratio; when the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is small, a closed-loop control strategy is executed, with the transmission ratio as the target of the closed-loop control, thereby causing the actual transmission ratio to approach or reach the target transmission ratio, thereby realizing precise control of the electronically controlled continuously variable transmission.

[0112] Optionally, after determining the actual transmission ratio and the target transmission ratio of the electronically controlled continuously variable transmission, the method further includes:

[0113] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold and greater than a second threshold, a control signal is determined based on the deviation and a closed-loop control strategy;

[0114] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a second threshold, determining a duration of the deviation being less than or equal to the second threshold;

[0115] If the duration is longer than the preset duration, control of the transmission execution motor is stopped.

[0116] In this embodiment, the second threshold is smaller than the first threshold. When the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is smaller than or equal to the second threshold, it indicates that the actual transmission ratio is very close to the target transmission ratio.

[0117] If the duration of the above deviation being less than or equal to the second threshold is greater than the preset duration, it means that the actual transmission ratio has stably approached the target transmission ratio and there is no obvious dynamic change or interference. Therefore, the control of the transmission execution motor can be stopped to maintain the current actual transmission ratio unchanged.

[0118] According to the above configuration, in the embodiment of the present invention, when the actual transmission ratio has stably approached the target transmission ratio, the control of the transmission execution motor is stopped, thereby avoiding unnecessary dynamic adjustments, reducing oscillations, and improving system stability.

[0119] Optionally, determining a target transmission ratio of the electronically controlled continuously variable transmission includes:

[0120] If the engine stall signal is received, the target transmission ratio is determined to be the maximum transmission ratio of the electronically controlled continuously variable transmission.

[0121] In this embodiment, through the above settings, the engine controller can drive the movable disk to move to the initial position corresponding to the maximum transmission ratio after receiving the engine shutdown signal, so as to ensure that the vehicle can accelerate smoothly when restarting, reduce the sense of frustration caused by insufficient torque, and provide a more comfortable driving experience.

[0122] Optionally, before determining the actual transmission ratio and the target transmission ratio of the electronically controlled continuously variable transmission, the method further includes:

[0123] If the engine is started, a fault detection instruction is sent to the transmission actuator motor, so that the transmission actuator motor controls the movable disk to move in a first direction and a second direction in sequence, wherein the first direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to decrease, and the second direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to increase;

[0124] Detecting changes in the actual transmission ratio of an electronically controlled continuously variable transmission;

[0125] If the actual transmission ratio change of the electronically controlled continuously variable transmission does not meet the preset change condition, the control of the transmission execution motor is stopped, and the vehicle is controlled to enter the limp home mode.

[0126] In this embodiment, the engine controller can determine the change of the actual transmission ratio through the engine speed and the driven plate speed sent in real time by the engine speed sensor and the driven plate speed sensor.

[0127] Before sending a fault detection command to the transmission actuator motor, it is possible to first determine whether the engine speed sensor and the driven plate speed sensor are fault-free, and whether the actual transmission ratio is within the initial range. If both are fault-free and within the initial range, a fault detection command can be sent. Alternatively, if fault mode 1 is entered, the conditions for using wheel speed instead of driven plate speed are met, and the actual transmission ratio is within the initial range, a fault detection command is sent.

[0128] The fault detection instructions are used to control the transmission actuator motor to move a certain distance in the first and second directions, respectively, thereby controlling the movable plate to move a certain distance in the first and second directions. By detecting the change in the actual transmission ratio, it is possible to determine whether the transmission actuator motor has failed. Specifically, if the change in the actual transmission ratio does not meet the preset change conditions (first decreasing and then increasing), the transmission actuator motor has failed (entering Fault Mode 2).

[0129] In the case of a failure of the transmission actuator motor, the embodiment of the present invention stops controlling the transmission actuator motor, thereby maintaining the current transmission ratio unchanged, and controls the vehicle to enter the limp home mode, which helps to ensure that the vehicle can safely travel to a maintenance point.

[0130] In order to more clearly understand the technical solution of the embodiment of the present invention, the following Figure 4 The technical solution of the present invention is exemplified.

[0131] Step 401: The engine controller is powered on and started.

[0132] In step 402 , the engine controller determines whether the engine is started.

[0133] Step 403: If the engine is started, the engine controller checks whether the engine speed sensor and the driven disc speed sensor are faulty.

[0134] Step 404: If only the driven disc speed sensor is faulty, then the system enters Fault Mode 1. If the engine speed sensor is faulty, the vehicle may be controlled to enter a limp home mode.

[0135] Step 405 : If the engine speed sensor and the driven disc speed sensor are both normal, or if the system enters fault mode 1 but the condition of using wheel speed instead of driven disc speed is met, then determine whether the transmission actuator motor is faulty.

[0136] Step 406: If the transmission actuator motor fails, the system enters Fault Mode 2.

[0137] In step 407, if the transmission actuator motor is not faulty, the target gear ratio and actual gear ratio are calculated. The actual gear ratio can be calculated based on the engine speed and the driven disc speed. If fault mode 1 is entered and the conditions for using wheel speed instead of driven disc speed are met, the actual gear ratio is calculated based on the engine speed and wheel speed.

[0138] Step 408 : Determine whether the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold.

[0139] Step 409 : If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold, a control signal for the transmission actuator motor is determined according to an open-loop control strategy.

[0140] Step 410: If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is not greater than the first threshold, determine whether the deviation is greater than the second threshold.

[0141] Step 411: If the value is greater than the second threshold, the control signal of the transmission execution motor is determined according to the closed-loop control strategy.

[0142] Step 412: If the value is not greater than the second threshold, determine the duration of the value not greater than the second threshold.

[0143] Step 413: If the duration is longer than the preset duration, stop controlling the transmission execution motor, that is, stop adjusting the transmission ratio.

[0144] Step 414: determine whether the engine is idling and ready to shut down.

[0145] In step 415 , if the engine is idling and ready to shut down, the movable plate is controlled to return to the initial position corresponding to the maximum transmission ratio.

[0146] The control method of the electronically controlled continuously variable transmission of the present invention can be executed by an engine controller. By replacing the active disc speed with the engine speed and adopting a control strategy that combines open-loop and closed-loop control of the transmission ratio, the electronic control function of the electronically controlled continuously variable transmission can be completed without the need for a transmission controller, an active disc speed sensor, and an active disc position sensor, thereby significantly reducing costs and saving installation space. It can be widely used on mid- and low-end scooters.

[0147] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0148] Figure 5 FIG. 1 is a block diagram of a control device for an electronically controlled continuously variable transmission according to an exemplary embodiment of the present invention. Figure 5 As shown, the control device of the exemplary electronically controlled continuously variable transmission includes:

[0149] A first determining module 510 is configured to determine an actual transmission ratio and a target transmission ratio of the electronically controlled continuously variable transmission during vehicle travel;

[0150] a second determining module 520 for determining a control signal for the transmission actuator motor according to a preset open-loop control strategy if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold;

[0151] a third determining module 530 for determining a control signal for the transmission actuator motor according to the deviation and a preset closed-loop control strategy if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold;

[0152] The first sending module 540 is configured to send a control signal to the transmission actuator motor, so that the transmission actuator motor controls the movable disk to move toward a target position according to the control signal. The target position is a position of the movable disk corresponding to a target transmission ratio.

[0153] In one embodiment of the present invention, the third determining module 530 is specifically configured to:

[0154] If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold and greater than a second threshold, a control signal is determined based on the deviation and a closed-loop control strategy;

[0155] The device also includes:

[0156] a fourth determining module, configured to determine a duration of time during which the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the second threshold if the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the second threshold;

[0157] The first control module is configured to stop controlling the transmission execution motor if the duration is greater than a preset duration.

[0158] In one embodiment of the present invention, the second determining module 520 is specifically configured to:

[0159] determining a driving direction of the transmission actuator motor based on the sign of a deviation between the target transmission ratio and the actual transmission ratio;

[0160] Determining the duty cycle of the transmission actuator motor based on a preset duty cycle variation curve, wherein the duty cycle variation curve is a curve in which the duty cycle gradually decreases as the open-loop control time increases;

[0161] The control signal is determined based on a duty cycle of the transmission actuating motor and a driving direction of the transmission actuating motor.

[0162] In one embodiment of the present invention, the first determining module 510 is specifically configured to:

[0163] If the engine stall signal is received, the target transmission ratio is determined to be the maximum transmission ratio of the electronically controlled continuously variable transmission.

[0164] In one embodiment of the present invention, the apparatus further comprises:

[0165] a second sending module, configured to send a fault detection instruction to the transmission execution motor when the engine is started, so that the transmission execution motor controls the movable disk to move in a first direction and a second direction in sequence, wherein the first direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to decrease, and the second direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to increase;

[0166] A fault detection module is used to detect changes in the actual transmission ratio of the electronically controlled continuously variable transmission;

[0167] The second control module is configured to stop controlling the transmission execution motor and control the vehicle to enter a limp home mode if a change in the actual transmission ratio does not satisfy a preset change condition.

[0168] In one embodiment of the present invention, the electronically controlled continuously variable transmission includes a driving disc and a driven disc, and the first determining module 510 is further configured to:

[0169] If the vehicle includes an engine speed sensor and a driven disc speed sensor, but does not include a driving disc speed sensor, then the engine speed and the driven disc speed are obtained;

[0170] The actual gear ratio is determined based on the engine speed and the driven plate speed.

[0171] In one embodiment of the present invention, the first determining module 510 is further configured to:

[0172] If a fault is detected in the driven plate speed sensor, the engine speed and the vehicle speed or wheel speed are obtained;

[0173] If the engine speed, vehicle speed or wheel speed is greater than the corresponding preset threshold, the actual rotation ratio is determined based on the engine speed and the vehicle speed or wheel speed.

[0174] The electronic device provided by the present invention includes:

[0175] one or more processors;

[0176] The storage device is used to store one or more programs. When the one or more programs are executed by one or more processors, the electronic device implements the control method of the electronically controlled continuously variable transmission.

[0177] The computer-readable storage medium provided by the present invention stores a computer program thereon. When the computer program is executed by a processor of a computer, the computer is caused to execute a control method of an electronically controlled continuously variable transmission.

[0178] It should be noted that the control device for an electronically controlled continuously variable transmission provided in the above-described embodiment and the control method for an electronically controlled continuously variable transmission provided in the above-described embodiment share the same concept. The specific manner in which the various modules and units perform their operations has been described in detail in the method embodiments and will not be repeated here. In actual applications, the control device for an electronically controlled continuously variable transmission provided in the above-described embodiment can, as needed, allocate the aforementioned functions to different functional modules, i.e., divide the internal structure of the device into different functional modules to perform all or part of the aforementioned functions. This is not intended to be limiting herein.

[0179] An embodiment of the present invention also provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the electronic device implements the control method of the electronically controlled continuously variable transmission provided in the above-mentioned embodiments.

[0180] Figure 6FIG1 shows a schematic diagram of the structure of a computer system suitable for implementing an electronic device according to an embodiment of the present invention. Figure 6 The computer system 600 of the electronic device shown is only an example and should not limit the functions and scope of use of the embodiments of the present invention.

[0181] like Figure 6 As shown, the computer system 600 includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 602 or the program loaded from the storage part 608 into the random access memory (RAM) 603, such as executing the method described in the above embodiment. Various programs and data required for system operation are also stored in the RAM 603. The CPU 601, ROM 602 and RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0182] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, a mouse, and the like; an output section 607 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and a speaker; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN (Local Area Network) card or a modem. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. Removable media 611, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 610 as needed, so that computer programs read therefrom can be installed into the storage section 608 as needed.

[0183] In particular, according to an embodiment of the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product that includes a computer program carried on a computer-readable medium, the computer program including a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 609 and / or installed from a removable medium 611. When the computer program is executed by the central processing unit (CPU) 601, the various functions defined in the system of the present invention are performed.

[0184] It should be noted that the computer-readable medium shown in the embodiments of the present invention may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. The computer-readable storage medium may, for example, be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to, an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable computer program. Such a propagated data signal may take a variety of forms, including, but not limited to, an electromagnetic signal, an optical signal, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. A computer program embodied on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wired, or any suitable combination thereof.

[0185] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions and operations of the systems, methods and computer program products according to various embodiments of the present invention. Each box in the flowchart or block diagram can represent a module, program segment, or part of the code, and the above-mentioned module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two boxes shown in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or can be implemented using a combination of dedicated hardware and computer instructions.

[0186] The units involved in the embodiments of the present invention may be implemented in software or hardware, and the units described may also be provided in a processor. In some cases, the names of these units do not limit the units themselves.

[0187] Another aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon. When executed by a computer processor, the computer program causes the computer to perform the aforementioned control method for an electronically controlled continuously variable transmission. The computer-readable storage medium may be included in the electronic device described in the above embodiments, or may exist independently and not be incorporated into the electronic device.

[0188] Another aspect of the present invention provides a computer program product or computer program, comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the control method of the electronically controlled continuously variable transmission provided in each of the above-described embodiments.

[0189] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, any equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A control method for an electronically controlled continuously variable transmission, characterized in that: The method comprises: During vehicle travel, determining an actual transmission ratio and a target transmission ratio of an electronically controlled continuously variable transmission; If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold, determining a control signal for the transmission actuator motor according to a preset open-loop control strategy; If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold, determining a control signal for the transmission actuator motor according to the deviation and a preset closed-loop control strategy; The control signal is sent to the transmission actuator motor so that the transmission actuator motor controls the movable disk of the electronically controlled continuously variable transmission to move toward a target position according to the control signal. The target position is the position of the movable disk corresponding to the target transmission ratio.

2. The control method of the electronically controlled continuously variable transmission according to claim 1, characterized in that: After determining the actual transmission ratio and the target transmission ratio of the electronically controlled continuously variable transmission, the method further includes: If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the first threshold and greater than a second threshold, determining the control signal according to the deviation and the closed-loop control strategy; If the absolute value of the deviation between the target transmission ratio and the actual transmission ratio is less than or equal to the second threshold, determining a duration of the deviation being less than or equal to the second threshold; If the duration is longer than a preset duration, controlling the transmission execution motor is stopped.

3. The control method of the electronically controlled continuously variable transmission according to claim 1, characterized in that: Determining the control signal of the transmission actuator motor according to a preset open-loop control strategy includes: determining a driving direction of the transmission actuator motor based on a sign of a deviation between the target transmission ratio and the actual transmission ratio; Determining the duty cycle of the transmission actuator motor based on a preset duty cycle variation curve, wherein the duty cycle variation curve is a curve in which the duty cycle gradually decreases as the open-loop control time increases; The control signal is determined based on a duty cycle of the transmission actuating motor and a driving direction of the transmission actuating motor.

4. The control method of the electronically controlled continuously variable transmission according to claim 1, characterized in that: Determining the target transmission ratio of the electronically controlled continuously variable transmission includes: If an engine shutdown signal is received, the target transmission ratio is determined to be the maximum transmission ratio of the electronically controlled continuously variable transmission.

5. The control method of the electronically controlled continuously variable transmission according to claim 4, characterized in that: Before determining the actual transmission ratio and the target transmission ratio of the electronically controlled continuously variable transmission, the method further includes: If the engine is started, a fault detection instruction is sent to the transmission execution motor, so that the transmission execution motor controls the movable plate to move in a first direction and a second direction in sequence, wherein the first direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to decrease, and the second direction is a direction for controlling the actual transmission ratio of the electronically controlled continuously variable transmission to increase; detecting a change in an actual transmission ratio of the electronically controlled continuously variable transmission; If the change of the actual transmission ratio does not meet the preset change condition, the control of the transmission execution motor is stopped, and the vehicle is controlled to enter the limp home mode.

6. The control method of an electronically controlled continuously variable transmission according to any one of claims 1 to 5, characterized in that: The electronically controlled continuously variable transmission includes a driving disc and a driven disc, and determining the actual transmission ratio of the electronically controlled continuously variable transmission includes: If the vehicle includes an engine speed sensor and a driven disc speed sensor, but does not include a driving disc speed sensor, then acquiring the engine speed and the driven disc speed; The actual gear ratio is determined based on the engine speed and the driven plate speed.

7. The control method of the electronically controlled continuously variable transmission according to claim 6, characterized in that: Determining the actual transmission ratio of the electronically controlled continuously variable transmission further includes: If a fault is detected in the driven disc speed sensor, the engine speed and the vehicle speed or wheel speed are obtained; If the engine speed, the vehicle speed, or the wheel speed is respectively greater than a corresponding preset threshold, the actual rotation ratio is determined based on the engine speed and the vehicle speed or the wheel speed.

8. A control device for an electronically controlled continuously variable transmission, characterized in that: include: A first determining module is used to determine an actual transmission ratio and a target transmission ratio of the electronically controlled continuously variable transmission during vehicle travel; a second determining module, configured to determine a control signal for a transmission actuator motor according to a preset open-loop control strategy if an absolute value of a deviation between the target transmission ratio and the actual transmission ratio is greater than a first threshold; a third determining module, configured to determine a control signal for a transmission actuator motor according to the deviation and a preset closed-loop control strategy if an absolute value of a deviation between the target transmission ratio and the actual transmission ratio is less than or equal to a first threshold; The first sending module is used to send the control signal to the transmission execution motor, so that the transmission execution motor controls the movable disk to move toward a target position according to the control signal. The target position is the position of the movable disk corresponding to the target transmission ratio.

9. A device, characterized in that include: one or more processors and memory, A computer program is stored in the memory, and when the one or more processors execute the computer program, the device executes the control method of the electronically controlled continuously variable transmission according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that A computer program is stored thereon, which, when executed by one or more processors, causes the device to execute the control method of the electronically controlled continuously variable transmission according to any one of claims 1 to 7.

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