Commercial vehicle AMT auxiliary gearbox shifting control method, auxiliary gearbox shifting system and commercial vehicle

Abstract

The application discloses a commercial vehicle AMT auxiliary gearbox shifting control method, an auxiliary gearbox shifting system and a commercial vehicle. The commercial vehicle AMT auxiliary gearbox shifting control method comprises the following steps: after high-low gear switching is completed; the position of a synchronizer is acquired in real time, and the number of times that the position of the synchronizer changes is recorded; a working mode is determined according to the position and the number of times of the synchronizer; the auxiliary gearbox shifting system is controlled to operate according to the determined working mode; the first working mode is that the air pressure in the air cavity is kept the same as the air pressure outside; the second working mode is that air is supplemented into the first air cavity and / or the second air cavity to drive the piston to move to the corresponding set position; the air supplementing is stopped and the air pressure in the air cavity is adjusted to be the same as the air pressure outside; the third working mode is that air is supplemented into the first air cavity and / or the second air cavity to drive the piston to move to the corresponding set position; and the air pressure states of the first air cavity and the second air cavity are kept. The risk that the synchronizer is still partially separated from the shifting gear engagement tooth after high-low gear switching is completed can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a commercial vehicle AMT auxiliary gearbox shifting control method, an auxiliary gearbox shifting system and a commercial vehicle. BACKGROUND

[0002] During the driving process of an automatic transmission vehicle, the shifting fork in the auxiliary gearbox drives the synchronizer to continuously reciprocate between the high gear shifting gear and the low gear shifting gear, so that the vehicle can switch between the low gear and the high gear. However, long-term and frequent switching between the high gear and the low gear will cause the tooth side step wear passivation of the synchronizer engaging teeth, and / or the tooth fillet wear passivation of the synchronizer engaging teeth, and / or the edge wear passivation of the shifting engaging teeth of the high gear shifting gear, and / or the edge wear passivation of the shifting engaging teeth of the low gear shifting gear. Therefore, after the switching between the high gear and the low gear is completed, the phenomenon of the synchronizer engaging teeth partially disengaging from the shifting engaging teeth of the high gear shifting gear or the shifting engaging teeth of the low gear shifting gear will occur due to the wear of the synchronizer engaging teeth, the wear of the shifting engaging teeth of the high gear shifting gear, the wear of the shifting engaging teeth of the low gear shifting gear, the vibration of the vehicle body, and external factors. The auxiliary gearbox shifting control method in the prior art is only limited to how to successfully switch between the high gear and the low gear at one time, and how to avoid the phenomenon of the synchronizer engaging teeth partially disengaging from the shifting engaging teeth of the high gear shifting gear or the shifting engaging teeth of the low gear shifting gear after the switching between the gears is completed still needs to be improved. SUMMARY

[0003] The present application aims to provide a commercial vehicle AMT auxiliary gearbox shifting control method, an auxiliary gearbox shifting system and a commercial vehicle to solve the above-mentioned problems existing in the prior art.

[0004] To achieve this purpose, the present application adopts the following technical solutions:

[0005] The commercial vehicle AMT auxiliary gearbox shifting control method, the auxiliary gearbox shifting system includes an auxiliary gearbox cylinder and a synchronizer, the auxiliary gearbox cylinder is provided with a piston, the piston separates the gas cavity of the auxiliary gearbox cylinder into a first gas cavity and a second gas cavity, the output end of the piston extends out of the auxiliary gearbox cylinder and can drive the synchronizer to move; the commercial vehicle AMT auxiliary gearbox shifting control method comprises:

[0006] After the switching between the high gear and the low gear is completed;

[0007] The position of the synchronizer is acquired in real time, and the number of times of changes in the position of the synchronizer is recorded;

[0008] The working mode of the auxiliary gearbox shifting system is determined according to the position of the synchronizer and the number of times;

[0009] The auxiliary gearbox shifting system is controlled to operate according to the determined working mode;

[0010] The working modes include a first working mode, a second working mode and a third working mode.

[0011] The first working mode is to keep the air pressure in the air cavity the same as the ambient air pressure.

[0012] The second working mode is to supplement air into the first air cavity and / or the second air cavity, drive the piston to move to a corresponding set position, stop air supplementing and adjust the air pressure in the air cavity to be the same as the ambient air pressure.

[0013] The set position includes a set high gear position and a set low gear position.

[0014] The third working mode is to supplement air into the first air cavity and / or the second air cavity, drive the piston to move to a corresponding set position, and keep the air pressure state of the first air cavity and the second air cavity.

[0015] As a preferred solution of the AMT auxiliary gearbox shifting control method for the commercial vehicle, the step of determining the working mode of the auxiliary gearbox shifting system according to the position of the synchronizer and the number of times includes:

[0016] judging whether the position of the synchronizer deviates or not.

[0017] If the position of the synchronizer does not change, the working mode of the auxiliary gearbox shifting system is determined as the first working mode.

[0018] If the position of the synchronizer changes, the working mode of the auxiliary gearbox shifting system is determined according to the number of times.

[0019] As a preferred solution of the AMT auxiliary gearbox shifting control method for the commercial vehicle, the step of determining the working mode of the auxiliary gearbox shifting system according to the number of times includes:

[0020] judging whether the number of times is greater than or equal to a set number of times or not.

[0021] If the number of times is less than the set number of times, the working mode of the auxiliary gearbox shifting system is determined as the second working mode.

[0022] If the number of times is greater than or equal to the set number of times, the working mode of the auxiliary gearbox shifting system is determined as the third working mode.

[0023] As a preferred solution of the AMT auxiliary gearbox shifting control method for the commercial vehicle, the AMT auxiliary gearbox shifting control method further includes:

[0024] controlling a first warning to be issued while the auxiliary gearbox shifting system is controlled to operate according to the second working mode.

[0025] As a preferred solution of the AMT auxiliary gearbox shift control method for commercial vehicles, the AMT auxiliary gearbox shift control method for commercial vehicles further comprises:

[0026] While the auxiliary gearbox shift system is controlled to operate according to the third working mode, a second warning is sent out.

[0027] As a preferred solution of the AMT auxiliary gearbox shift control method for commercial vehicles, the AMT auxiliary gearbox shift control method for commercial vehicles further comprises:

[0028] The position of the piston is monitored in real time.

[0029] The position of the synchronizer is determined according to the position of the piston.

[0030] An auxiliary gearbox shift system comprises an auxiliary gearbox cylinder and a synchronizer, the auxiliary gearbox cylinder is provided with a piston, the piston separates the auxiliary gearbox cylinder into a first cavity and a second cavity, the output end of the piston extends out of the auxiliary gearbox cylinder and can drive the synchronizer to move, and the auxiliary gearbox shift system is used to execute the AMT auxiliary gearbox shift control method for commercial vehicles.

[0031] As a preferred solution of the auxiliary gearbox shift system, the auxiliary gearbox shift system further comprises a position sensor, the position sensor is used to monitor the distribution position of the piston.

[0032] As a preferred solution of the auxiliary gearbox shift system, the auxiliary gearbox shift system further comprises a high-low gear shift valve assembly, the high-low gear shift valve assembly can selectively charge the first cavity and / or the second cavity, and can selectively discharge the gas in the first cavity and / or the second cavity to the outside.

[0033] A commercial vehicle comprises the auxiliary gearbox shift system.

[0034] The present application has the following advantages:

[0035] The application provides a commercial vehicle AMT auxiliary gearbox shifting control method.

[0036] By adopting the commercial vehicle AMT auxiliary gearbox shifting control method, the working mode of the auxiliary gearbox shifting system can be adaptively determined according to the distribution position of the synchronizer and the number of times of change of the position of the synchronizer, so that the vehicle can effectively avoid the risk that the synchronizer engaging teeth are partially separated from the shift engaging teeth of the high-gear shifting gear or the shift engaging teeth of the low-gear shifting gear after the high-low gear switching is completed due to the synchronizer engaging teeth wear, the shift engaging teeth wear of the high-gear shifting gear, the shift engaging teeth wear of the low-gear shifting gear, vehicle body vibration, and external factors, and can effectively improve the transmission performance, use reliability and safety of the commercial vehicle.

[0037] The application further provides an auxiliary gearbox shifting system, comprising an auxiliary gearbox cylinder and a synchronizer, the auxiliary gearbox cylinder is provided with a piston, the piston separates the gas cavity of the auxiliary gearbox cylinder into a first gas cavity and a second gas cavity, and the output end of the piston extends out of the auxiliary gearbox cylinder and can drive the synchronizer to move; the auxiliary gearbox shifting system is used to execute the commercial vehicle AMT auxiliary gearbox shifting control method described above. By adopting the commercial vehicle AMT auxiliary gearbox shifting control method to control the auxiliary gearbox shifting system, the vehicle can effectively avoid the risk that the synchronizer engaging teeth are partially separated from the shift engaging teeth of the high-gear shifting gear or the shift engaging teeth of the low-gear shifting gear after the high-low gear switching is completed due to the synchronizer engaging teeth wear, the shift engaging teeth wear of the high-gear shifting gear, the shift engaging teeth wear of the low-gear shifting gear, vehicle body vibration, and external factors, and can effectively improve the transmission performance, use reliability and safety of the commercial vehicle.

[0038] The application further provides a commercial vehicle, comprising the auxiliary gearbox shifting system described above. By adopting the auxiliary gearbox shifting system described above, the transmission performance, use reliability and safety of the commercial vehicle can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1is a structural schematic view of a range box gear shifting system provided by specific embodiments of the present application;

[0040] Figure 2 is a flow chart of a commercial vehicle AMT range box gear shifting control method provided by specific embodiments of the present application.

[0041] in the figure:

[0042] 1, range box cylinder; 11, piston; 12, first air cavity; 13, second air cavity; 14, first air port; 15, second air port;

[0043] 2, synchronizer;

[0044] 3, position sensor;

[0045] 4, range box gear shifting fork;

[0046] 5, two-position three-way valve. DETAILED DESCRIPTION

[0047] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, and are not a limitation on the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, and not all the structures.

[0048] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and oblique upward of the first feature above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical and oblique downward of the first feature below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0050] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0051] This invention provides a secondary gearbox shifting system, such as... Figure 1 As shown, the auxiliary gearbox shifting system includes an auxiliary gearbox cylinder 1 and a synchronizer 2. The auxiliary gearbox cylinder 1 contains a piston 11, which divides the cylinder's air chamber into a first air chamber 12 and a second air chamber 13. The output end of the piston 11 extends out of the auxiliary gearbox cylinder 1 and can drive the synchronizer 2 to move. By inflating the first air chamber 12 and / or the second air chamber 13, the piston 11 is moved, thereby driving the synchronizer 2 connected to the output end of the piston 11 to move, thus enabling the vehicle to switch between high and low gears.

[0052] Specifically, such as Figure 1 As shown, the auxiliary gearbox shifting system also includes an auxiliary gearbox shift fork 4, which is connected to the output end of the piston 11 and to the synchronizer 2. This allows it to drive the synchronizer 2 to move. The connection method between the auxiliary gearbox shift fork 4, the output end of the piston 11, and the synchronizer 2 is existing technology and will not be described further here.

[0053] Among them, such as Figure 1 As shown, the auxiliary gearbox shifting system also includes a position sensor 3, which monitors the distribution position of the piston 11. By monitoring the distribution position of the piston 11, it is easier to determine whether the gear shift was successful, whether there is a tendency to disengage after a successful gear shift, and whether the gear has disengaged after a successful gear shift. Specifically, in this embodiment, the position sensor 3 is exemplarily fixedly installed inside the auxiliary gearbox cylinder 1, and the position sensor 3 is far away from the second air port 15 relative to the first air port 14; the sensor magnetic ring used in conjunction with the position sensor 3 is fixedly installed on the piston 11. This enables the monitoring of the distribution position of the piston 11.

[0054] The auxiliary gearbox shifting system also includes a high / low gear shifting valve assembly. This assembly can selectively fill the first air chamber 12 and / or the second air chamber 13 with air, and can selectively discharge the air from the first air chamber 12 and / or the second air chamber 13 to the outside. This allows the piston 11 to be moved to a set high gear position, and also allows the piston 11 to be moved to a set low gear position.

[0055] Specifically, such as Figure 1As shown, the high-low gear shifting air valve assembly includes two two-position three-way valves 5, and the two two-position three-way valves 5 correspond to the first air cavity 12 and the second air cavity 13 one by one; the two-position three-way valve 5 includes a first interface, a second interface and a third interface, the first interface is in communication with the gas source, the second interface is used for communication with the first air cavity 12 or the second air cavity 13, and the third interface is in communication with the outside; when the two-position three-way valve 5 is located at the first working position, the first interface is in communication with the second interface, and when the two-position three-way valve 5 is located at the second working position, the second interface is in communication with the third interface. By such arrangement, the first air cavity 12 and / or the second air cavity 13 can be selectively inflated, and the piston 11 can be pushed to move to the set high gear position or the set low gear position; secondly, the first air cavity 12 and / or the second air cavity 13 can be in communication with the outside, so that the first air cavity 12 can be exhausted to the same atmospheric pressure as the outside, and the second air cavity 13 can be exhausted to the same atmospheric pressure as the outside, so that the air pressure in the air cavity can be the same as the outside air pressure. It can be understood that the outside air pressure refers to the atmospheric pressure.

[0056] Further, as shown in the figure, Figure 1 The auxiliary gearbox cylinder 1 is provided with a first air port 14 and a second air port 15, the first air port 14 is in communication with the first air cavity 12 and the second interface of one of the two-position three-way valves 5, and the second air port 15 is in communication with the second air cavity 13 and the second interface of the other two-position three-way valve 5.

[0057] Further, the auxiliary gearbox cylinder 1 is also provided with a first limiting structure and a second limiting structure, the first limiting structure and the second limiting structure are distributed between the first air port 14 and the second air port 15, and the piston 11 is distributed between the first limiting structure and the second limiting structure. In this embodiment, it is exemplarily provided that when the piston 11 abuts against the first limiting structure, the piston 11 is distributed at the set high gear position; and when the piston 11 abuts against the second limiting structure, the piston 11 is distributed at the set low gear position.

[0058] Specifically, in this embodiment, it is exemplarily provided that the two two-position three-way valves 5 are respectively a first two-position three-way valve and a second two-position three-way valve, the first two-position three-way valve corresponds to the first air cavity 12, the first air port 14 and the first limiting structure, and the second two-position three-way valve corresponds to the second air cavity 13, the second air port 15 and the second limiting structure.

[0059] It can be understood that the high-low gear shifting air valve assembly composed of other structures can also be adopted. It is only required that the first air cavity 12 and / or the second air cavity 13 can be selectively inflated, and the gas in the first air cavity 12 and / or the second air cavity 13 can be selectively exhausted to the outside.

[0060] The application also provides a commercial vehicle comprising the above-mentioned auxiliary gearbox shifting system.

[0061] Specifically, the commercial vehicle also includes a controller and an instrument panel. The controller is electrically connected to the position sensor 3, the instrument panel, and two two-position three-way valves 5. The controller can receive electrical signals from the position sensor 3. The controller can control the operation of the two two-position three-way valves 5. The controller can control the instrument panel to display alarm information.

[0062] During the operation of an automatic transmission vehicle, the shift fork in the auxiliary gearbox drives the synchronizer to continuously switch between high and low gears, allowing the vehicle to shift back and forth between low and high gears. However, frequent and prolonged shifting between high and low gears can cause stepped wear and dulling of the synchronizer engagement teeth, and / or wear and dulling of the synchronizer engagement teeth's rounded corners, and / or wear and dulling of the edges and corners of the high-gear and low-gear engagement teeth. Consequently, after shifting between high and low gears, wear of the synchronizer engagement teeth, wear of the high-gear engagement teeth, wear of the low-gear engagement teeth, vehicle vibration, and external factors can cause the synchronizer engagement teeth to partially disengage from the high-gear or low-gear engagement teeth. Existing auxiliary gearbox shifting control methods are limited to ensuring a successful one-time shift when switching between high and low gears. However, there is still room for improvement in how to prevent the synchronizer engagement teeth from disengaging from the engagement teeth of the high-gear or low-gear shifting gears after the gear shift is completed.

[0063] Therefore, this invention also provides a method for controlling the shifting of the auxiliary gearbox in an AMT (Automated Manual Transmission) for commercial vehicles, used to control the aforementioned auxiliary gearbox shifting system. By employing this method to control the auxiliary gearbox shifting system, after the vehicle completes high-low gear shifting, the risk of the synchronizer 2 partially disengaging from the shifting teeth of the high-gear or low-gear shifting gears after the high-low gear shift is effectively avoided due to wear of the synchronizer engagement teeth, wear of the engagement teeth of the high-gear shifting gear, wear of the engagement teeth of the low-gear shifting gear, vehicle vibration, and external factors. This effectively improves the transmission performance, reliability, and safety of the commercial vehicle.

[0064] Specifically, such as Figure 2 As shown, the shift control method for the auxiliary gearbox of this commercial vehicle AMT includes:

[0065] After completing the high / low gear switching, proceed to step S100.

[0066] It is understandable that shifting between high and low gears includes shifting from a high gear to a low gear, and vice versa. Shift gears include high-gear shift gears and low-gear shift gears.

[0067] Specifically, when switching from low gear to high gear, the synchronizer 2 engages with the shift-on mesh gear of the high gear, and the second port and the third port of the two-way three-way valve 5 are connected to make the air pressure in the air cavity equal to the ambient air pressure.

[0068] Specifically, when switching from high gear to low gear, the synchronizer 2 engages with the shift-on mesh gear of the low gear, and the second port and the third port of the two-way three-way valve 5 are connected to make the air pressure in the air cavity equal to the ambient air pressure.

[0069] S100, acquiring the position of the synchronizer 2 in real time, and recording the number of times of changes in the position of the synchronizer 2.

[0070] S200, determining the working mode of the auxiliary gearbox shift system according to the position and the number of times of the synchronizer 2. The working mode includes a first working mode, a second working mode, and a third working mode.

[0071] Specifically, step S200 includes:

[0072] S210, determining whether the position of the synchronizer 2 deviates.

[0073] Specifically, the position of the synchronizer 2 is determined according to the position of the piston 11. Further, the position of the piston 11 is determined according to the electrical signal fed back by the position sensor 3, and then the position of the synchronizer 2 is determined according to the position of the piston 11.

[0074] If the position of the synchronizer 2 does not change, step S220 is performed.

[0075] S220, determining that the working mode of the auxiliary gearbox shift system is the first working mode.

[0076] If the position of the synchronizer 2 changes, step S230 is performed.

[0077] S230, determining the working mode of the auxiliary gearbox shift system according to the number of times.

[0078] Specifically, step S230 includes:

[0079] S231, determining whether the number of times is greater than or equal to a set number of times.

[0080] If the number of times is less than the set number of times, step S232 is performed.

[0081] S232, determining that the working mode of the auxiliary gearbox shift system is the second working mode.

[0082] If the number of times is greater than or equal to the set number of times, step S233 is performed.

[0083] S233, determine the working mode of the auxiliary gearbox shifting system as the third working mode.

[0084] S300, control the auxiliary gearbox shifting system to operate according to the determined working mode.

[0085] It can be understood that after the high-low gear switching is completed, once the position of the synchronizer 2 changes, the working mode of the auxiliary gearbox shifting system will be immediately adjusted, and the auxiliary gearbox shifting system will be controlled to operate in the determined working mode.

[0086] Specifically, when it is determined that the working mode of the auxiliary gearbox shifting system is the first working mode, the auxiliary gearbox shifting system is controlled to operate according to the first working mode. When it is determined that the working mode of the auxiliary gearbox shifting system is the second working mode, the auxiliary gearbox shifting system is controlled to operate according to the second working mode. When it is determined that the working mode of the auxiliary gearbox shifting system is the third working mode, the auxiliary gearbox shifting system is controlled to operate according to the third working mode.

[0087] The first working mode is to keep the air pressure in the air chamber the same as the ambient air pressure.

[0088] It can be understood that when the auxiliary gearbox shifting system is controlled to operate in the first working mode, it indicates that after the gear shifting is completed, the synchronizer engaging teeth are not disengaged from the gear shifting teeth of the high gear shifting gear or the gear shifting teeth of the low gear shifting gear, and there is no need to supplement air into the first air chamber 12 and / or the second air chamber 13 to drive the piston 11 to move. Specifically, at this time, if it is switched to the high gear, the synchronizer engaging teeth are well engaged with the gear shifting teeth of the high gear shifting gear. At this time, if it is switched to the low gear, the synchronizer 2 is well engaged with the gear shifting teeth of the low gear shifting gear.

[0089] The second working mode is to supplement air into the first air chamber 12 and / or the second air chamber 13 to drive the piston 11 to move to the corresponding set position, and then stop the air supplement and adjust the air pressure in the air chamber to be the same as the ambient air pressure.

[0090] The set position includes a set high gear position and a set low gear position. Specifically, the set high gear position is related to the setting position of the first exhaust port. The set low gear position is related to the setting position of the second exhaust port.

[0091] It can be understood that if it is switched to the high gear, air is supplemented into the first air chamber 12 and / or the second air chamber 13, which indicates that the synchronizer engaging teeth are partially disengaged from the gear shifting teeth of the high gear shifting gear, at this time, the piston 11 is synchronously offset from the set high gear position. If it is switched to the low gear, air is supplemented into the first air chamber 12 and / or the second air chamber 13, which indicates that the synchronizer engaging teeth are partially disengaged from the gear shifting teeth of the low gear shifting gear, at this time, the piston 11 is synchronously offset from the set low gear position.

[0092] Specifically, when the number of times is less than the set number of times, it indicates that the frequency of disengagement of the synchronizer engagement teeth is low. When not affected by the body vibration and external factors, etc., it can be determined that the synchronizer engagement teeth have a certain wear, the shift engagement teeth of the high gear shift gear have a certain wear, and the shift engagement teeth of the low gear shift gear have a certain wear.

[0093] By means of air supplement, the piston 11 can be pushed to return to the set high gear position, so that the synchronizer engagement teeth can be well engaged with the shift engagement teeth of the high gear shift gear. After the piston 11 returns to the set high gear position, the air supplement is stopped and the air pressure in the air chamber is adjusted to be the same as the external air pressure. In this way, the energy consumption can be reduced, and the wear severity of the synchronizer engagement teeth and the shift engagement teeth of the high gear shift gear can be accurately predicted later.

[0094] By means of air supplement, the piston 11 can be pushed to return to the set low gear position, so that the synchronizer engagement teeth can be well engaged with the shift engagement teeth of the low gear shift gear. After the piston 11 returns to the set low gear position, the air supplement is stopped and the air pressure in the air chamber is adjusted to be the same as the external air pressure. In this way, the energy consumption can be reduced, and the wear severity of the synchronizer engagement teeth and the shift engagement teeth of the low gear shift gear can be accurately predicted later.

[0095] Preferably, the first warning is controlled to be issued while the auxiliary gearbox cylinder 1 is controlled to operate according to the second working mode. The driver is reminded to overhaul or replace the synchronizer 2, the high gear shift gear and the low gear shift gear.

[0096] Therefore, the driver can drive to the nearby repair point according to the first warning. The reliability and safety of the vehicle can be improved on the basis of ensuring the transmission performance of the vehicle.

[0097] The third working mode is to supplement air into the first air chamber 12 and / or the second air chamber 13 to drive the piston 11 to move to the corresponding set position, and keep the air pressure state of the first air chamber 12 and the second air chamber 13.

[0098] Specifically, when the number of times is greater than or equal to the set number of times, it indicates that the frequency of disengagement of the synchronizer 2 is high. It indicates that the risk of disengagement of the synchronizer engagement teeth is high, and it is also clear that the synchronizer engagement teeth have a serious wear, the shift engagement teeth of the high gear shift gear have a serious wear, and the shift engagement teeth of the low gear shift gear have a serious wear.

[0099] By means of air supplement, the piston 11 can be pushed to return to the set high gear position, and the air pressure state of the first air cavity 12 and the second air cavity 13 can be maintained, so that the engagement state of the synchronizer engagement tooth and the gear shifting tooth of the high gear shifting gear can be maintained. Thus, the synchronizer engagement tooth can be well engaged with the gear shifting tooth of the high gear shifting gear. Therefore, the vehicle can be driven for a short distance.

[0100] By means of air supplement, the piston 11 can be pushed to return to the set low gear position, and the air pressure state of the first air cavity 12 and the second air cavity 13 can be maintained, so that the engagement state of the synchronizer engagement tooth and the gear shifting tooth of the low gear shifting gear can be maintained. Thus, the synchronizer engagement tooth can be well engaged with the gear shifting tooth of the low gear shifting gear. Therefore, the vehicle can be driven for a short distance.

[0101] Preferably, the second warning is controlled to be sent while the auxiliary gearbox shifting system is controlled to operate according to the third working mode. The driver is warned to replace the synchronizer 2, the high gear shifting gear and the low gear shifting gear.

[0102] In this way, the driver can drive the vehicle to the nearest maintenance point for a short distance according to the second warning. During the short distance driving, the reliability and safety of the vehicle can be improved on the basis of ensuring the transmission performance of the vehicle.

[0103] Therefore, by controlling the above-mentioned auxiliary gearbox shifting system by using the commercial vehicle AMT auxiliary gearbox shifting control method, the vehicle can effectively avoid the risk that the synchronizer 2 is partially separated from the gear shifting tooth of the high gear shifting gear or the gear shifting tooth of the low gear shifting gear after the high-low gear switching is completed due to the wear of the synchronizer engagement tooth, the wear of the gear shifting tooth of the high gear shifting gear, the wear of the gear shifting tooth of the low gear shifting gear, the vibration of the vehicle body and external factors, and the like. The transmission performance, use reliability and safety of the commercial vehicle can be effectively improved.

[0104] The synchronizer engagement tooth comprises a first engagement tooth part for engaging with the gear shifting tooth of the high gear shifting gear and a second engagement tooth part for engaging with the gear shifting tooth of the low gear shifting gear. It can be understood that the first engagement tooth part and the second engagement tooth part are spaced apart along the axial direction of the synchronizer.

[0105] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. It is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A method for controlling the shifting of an auxiliary gearbox in an AMT (Automated Manual Transmission) for commercial vehicles, wherein the auxiliary gearbox shifting system includes an auxiliary gearbox cylinder (1) and a synchronizer (2), wherein the auxiliary gearbox cylinder (1) is provided with a piston (11), the piston (11) divides the air chamber of the auxiliary gearbox cylinder (1) into a first air chamber (12) and a second air chamber (13), and the output end of the piston (11) extends out of the auxiliary gearbox cylinder (1) and can drive the synchronizer (2) to move; characterized in that, The commercial vehicle AMT auxiliary gearbox shifting control method includes: After completing the high / low gear switching; The position of the synchronizer (2) is obtained in real time, and the number of times the position of the synchronizer (2) changes is recorded; The working mode of the auxiliary gearbox shifting system is determined based on the position of the synchronizer (2) and the number of times it is used; The auxiliary gearbox shifting system is controlled to operate according to the determined working mode; The working modes include: a first working mode, a second working mode, and a third working mode; The first working mode is: to keep the air pressure inside the air chamber the same as the external air pressure; The second working mode is as follows: replenishing air into the first air chamber (12) and / or the second air chamber (13) to drive the piston (11) to move to the corresponding set position; stopping the replenishment of air and adjusting the air pressure of the air chamber to be the same as the external air pressure; The set position includes: setting a high gear position and setting a low gear position; The third working mode is: replenishing air into the first air chamber (12) and / or the second air chamber (13) to drive the piston (11) to move to the corresponding set position; maintaining the air pressure state of the first air chamber (12) and the second air chamber (13).

2. The commercial vehicle AMT auxiliary gearbox shifting control method according to claim 1, characterized in that, The steps for determining the operating mode of the auxiliary gearbox shifting system based on the position of the synchronizer (2) and the number of times include: Determine whether the position of synchronizer (2) is deviated; If the position of the synchronizer (2) does not change, then the working mode of the auxiliary gearbox shifting system is determined to be the first working mode; If the position of the synchronizer (2) changes, the working mode of the auxiliary gearbox shifting system is determined based on the number of changes.

3. The commercial vehicle AMT auxiliary gearbox shifting control method according to claim 2, characterized in that, The steps for determining the operating mode of the auxiliary gearbox shifting system based on the number of times include: Determine whether the number of times is greater than or equal to the set number of times; If the number of times is less than the set number of times, then the working mode of the auxiliary gearbox shifting system is determined to be the second working mode; If the number of times is greater than or equal to the set number of times, then the working mode of the auxiliary gearbox shifting system is determined to be the third working mode.

4. The commercial vehicle AMT auxiliary gearbox shifting control method according to any one of claims 1-3, characterized in that, The commercial vehicle AMT auxiliary gearbox shifting control method also includes: While controlling the operation of the auxiliary gearbox shifting system according to the second working mode, the system also issues a first alarm.

5. The commercial vehicle AMT auxiliary gearbox shifting control method according to any one of claims 1-3, characterized in that, The commercial vehicle AMT auxiliary gearbox shifting control method also includes: While controlling the operation of the auxiliary gearbox shifting system according to the third working mode, a second alarm is issued.

6. The commercial vehicle AMT auxiliary gearbox shifting control method according to any one of claims 1-3, characterized in that, The commercial vehicle AMT auxiliary gearbox shifting control method also includes: Real-time monitoring of the position of the piston (11); The position of the synchronizer (2) is determined based on the position of the piston (11).

7. A secondary gearbox shifting system, comprising a secondary gearbox cylinder (1) and a synchronizer (2), wherein the secondary gearbox cylinder (1) is provided with a piston (11), the piston (11) dividing the air chamber of the secondary gearbox cylinder (1) into a first air chamber (12) and a second air chamber (13), the output end of the piston (11) extending out of the secondary gearbox cylinder (1) and capable of driving the synchronizer (2) to move; characterized in that, The auxiliary gearbox shifting system is used to execute the commercial vehicle AMT auxiliary gearbox shifting control method according to any one of claims 1-6.

8. The auxiliary gearbox shifting system according to claim 7, characterized in that, The auxiliary gearbox shifting system also includes a position sensor (3), which is used to monitor the distribution position of the piston (11).

9. The auxiliary gearbox shifting system according to claim 7, characterized in that, The auxiliary gearbox shifting system also includes a high and low gear shifting valve assembly, which can selectively fill the first air chamber (12) and / or the second air chamber (13) with air, and can selectively discharge the gas in the first air chamber (12) and / or the second air chamber (13) to the outside.

10. A commercial vehicle, characterized in that, Includes the auxiliary gearbox shifting system as described in any one of claims 7-9.

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