A synchronizer shift pneumatic control method

Abstract

The application discloses a synchronizer gear shifting pneumatic control method. By controlling the action of the forward electromagnetic valve and the action of the reverse electromagnetic valve based on the first synchronization gear shifting correlation information of the synchronizer at the beginning of gear shifting, the running speed of the synchronizer can be accurately controlled, and the "gear tooth abnormal sound" phenomenon generated in the synchronizer gear shifting process can be effectively avoided. In the synchronization starting to synchronization ending stage, the compensation opening valve duty cycle of the forward electromagnetic valve is determined based on the second synchronization gear shifting correlation information of the synchronizer, and a compensation value is added to the control duty cycle of the forward electromagnetic valve, so that the running speed of the synchronizer is improved by the compensation value, the gear shifting time of the synchronizer is effectively shortened, and the service life of the synchronizer is improved. In the synchronization ending to gear shifting completion stage, the reverse electromagnetic valve is controlled to be turned on according to the preset time, a reverse braking force is generated to reduce the running speed of the synchronizer, so that the end face impact noise generated due to the too fast speed at the gear shifting ending moment is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of vehicle control technology, and in particular to a synchronizer shifting pneumatic control method. Background Technology

[0002] Currently, synchronizer shifting methods are divided into electric shifting, hydraulic shifting, and pneumatic shifting. Among them, pneumatic shifting has advantages such as low cost, fast shifting action, and simple structure, making it increasingly widely used in mechanical automatic transmissions.

[0003] The existing pneumatic shifting method has too low precision in controlling the operating speed of the synchronizer. It is easy to cause the "gear grinding noise" phenomenon when the operating speed is too fast or the shifting time is increased when the operating speed is too slow. In addition, a large end face impact noise is generated at the end of the shift. Summary of the Invention

[0004] This invention provides a pneumatic control method for synchronizer shifting to solve the problems of "gear-gripping noise" generated during synchronizer shifting and end-face impact noise generated at the end of shifting.

[0005] According to one aspect of the present invention, a pneumatic control method for synchronizer shifting is provided, comprising:

[0006] At the start of gear shifting, acquire the first synchronized gear shifting association information of the synchronizer;

[0007] The first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve are determined based on the first synchronous shift association information of the synchronizer.

[0008] The opening and closing of the forward solenoid valve and the opening and closing of the reverse solenoid valve are controlled according to the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve.

[0009] The synchronizer is controlled to enter the synchronization start to synchronization end stage according to the first synchronization shift association information of the synchronizer, and the second synchronization shift association information of the synchronizer is obtained.

[0010] The second opening duty cycle of the forward solenoid valve and the compensation opening duty cycle of the forward solenoid valve are determined based on the second synchronous shift association information of the synchronizer.

[0011] The opening and closing of the positive solenoid valve are controlled according to the second opening duty cycle of the positive solenoid valve and the compensation opening duty cycle of the positive solenoid valve.

[0012] According to the second synchronous shift association information of the synchronizer, the synchronizer is controlled to enter the stage from the end of synchronization to the completion of shifting, and the third synchronous shift association information of the synchronizer is obtained;

[0013] The opening and closing of the forward solenoid valve and the opening and closing of the reverse solenoid valve are controlled according to the third synchronous shift association information of the synchronizer.

[0014] Optionally, the first synchronized shift association information of the synchronizer includes: the position information of the synchronizer when the vehicle is in neutral, the current position information of the synchronizer, the position information of the synchronizer when synchronization begins, and the first operating speed of the synchronizer;

[0015] The step of determining the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve based on the first synchronous shifting association information of the synchronizer includes:

[0016] Calculate the first position difference based on the current position information of the synchronizer and the position information of the synchronizer when the vehicle is in neutral.

[0017] Calculate the second position difference based on the current position information of the synchronizer and the position information at which the synchronizer begins synchronization;

[0018] The ratio between the second position difference and the first position difference is calculated, and the first opening duty cycle of the positive solenoid valve is determined by querying the first calibration table based on the ratio.

[0019] Determine whether the first running speed is greater than the first preset speed;

[0020] When the first operating speed is greater than the first preset speed, the first opening duty cycle of the reverse solenoid valve is determined by querying the first calibration table based on the preset speed and the difference between the preset speed and the first operating speed.

[0021] Optionally, controlling the synchronizer to enter the synchronization start to synchronization end stage according to the first synchronization shift association information of the synchronizer includes:

[0022] Determine whether the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer started synchronizing;

[0023] When the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer begins synchronization, the synchronizer is controlled to enter the synchronization start to synchronization end stage.

[0024] Furthermore, after determining whether the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer begins synchronization, the method further includes:

[0025] When the current position information of the synchronizer is less than the position information at which the synchronizer begins synchronization, the first synchronization shift association information of the synchronizer continues to be acquired.

[0026] Optionally, the second synchronized shift association information of the synchronizer includes: the rotational speed of the synchronizer's synchronizing side, the rotational speed of the synchronized gear on the synchronized side, the current air supply pressure of the air reservoir, and the oil temperature in the transmission.

[0027] The step of determining the second opening duty cycle of the positive solenoid valve and the compensated opening duty cycle of the positive solenoid valve based on the second synchronous shift association information of the synchronizer includes:

[0028] The difference between the rotational speed of the synchronizing side of the synchronizer and the rotational speed of the gear on the synchronized side of the synchronizer is calculated.

[0029] The second opening duty cycle of the positive solenoid valve is determined by querying the second calibration table based on the difference.

[0030] The compensation opening duty cycle of the positive solenoid valve is determined by consulting the second calibration table based on the current air supply pressure of the air reservoir and the oil temperature in the gearbox.

[0031] Optionally, controlling the opening and closing of the forward solenoid valve based on the second opening duty cycle of the forward solenoid valve and the compensated opening duty cycle of the forward solenoid valve includes:

[0032] The opening and closing of the forward solenoid valve are controlled by the sum of the compensated opening duty cycle of the forward solenoid valve and the second opening duty cycle of the forward solenoid valve.

[0033] Optionally, the second synchronous shift association information of the synchronizer may further include: the third operating speed of the synchronizer;

[0034] The step of controlling the synchronizer to enter the stage from the end of synchronization to the completion of gear shifting based on the second synchronization shift association information of the synchronizer includes:

[0035] Determine whether the third operating speed is greater than the third preset speed;

[0036] When the third operating speed is greater than the third preset speed, the synchronizer is controlled to enter the synchronization end to shift completion stage.

[0037] Furthermore, after determining whether the third operating speed is greater than the third preset speed, the method further includes:

[0038] When the third operating speed is less than or equal to the third preset speed, the compensation opening duty cycle of the positive solenoid valve is determined by consulting the second calibration table based on the current air supply pressure of the air reservoir and the oil temperature in the gearbox.

[0039] Optionally, the third synchronous shifting association information of the synchronizer includes: the fourth operating speed of the synchronizer, the fifth operating speed of the synchronizer, the current position information of the synchronizer, and the position information of the synchronizer when the shift is completed;

[0040] The control of the forward solenoid valve's opening and closing, and the reverse solenoid valve's opening and closing based on the third synchronous shift association information of the synchronizer, includes:

[0041] The third opening duty cycle of the positive solenoid valve is determined by querying the third calibration table based on the fourth operating speed of the synchronizer.

[0042] The opening and closing of the positive solenoid valve are controlled according to the third opening duty cycle of the positive solenoid valve.

[0043] Determine whether the fifth operating speed is greater than the fourth preset speed;

[0044] When the fifth operating speed is greater than the fourth preset speed, the reverse solenoid valve is controlled to open, and after a preset time, the reverse solenoid valve is controlled to close.

[0045] Determine whether the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the gear shift is completed;

[0046] If the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the shift is completed, then the forward solenoid valve and the reverse solenoid valve are controlled to be turned off.

[0047] If the current position information of the synchronizer is less than the position information of the synchronizer when the shift is completed, then the third synchronized shift association information of the synchronizer is obtained.

[0048] Furthermore, after determining whether the fifth operating speed is greater than the fourth preset speed, the process also includes:

[0049] When the fifth operating speed is less than or equal to the fourth preset speed, it is determined whether the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the gear shift is completed;

[0050] When the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the shift is completed, the forward solenoid valve and the reverse solenoid valve are controlled to close.

[0051] The technical solution provided by this invention involves: acquiring first synchronous shifting association information of the synchronizer at the start of shifting; determining the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve based on the first synchronous shifting association information; controlling the on / off state of the forward solenoid valve and the reverse solenoid valve based on the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve; controlling the synchronizer to enter the synchronization start to synchronization end stage based on the first synchronous shifting association information of the synchronizer, and acquiring the second synchronous shifting information of the synchronizer. The system includes: determining the second opening duty cycle and the compensated opening duty cycle of the forward solenoid valve based on the second synchronous shifting correlation information of the synchronizer; controlling the on / off state of the forward solenoid valve based on its second opening duty cycle and compensated opening duty cycle; controlling the synchronizer to enter the synchronization end to shift completion stage based on its second synchronous shifting correlation information, and acquiring the third synchronous shifting correlation information of the synchronizer; and controlling the on / off state of the forward solenoid valve and the reverse solenoid valve based on the third synchronous shifting correlation information of the synchronizer. The technical solution provided by this invention controls the operation of the forward solenoid valve and the reverse solenoid valve based on the first synchronous shift association information of the synchronizer at the start of shifting, thereby enabling precise control of the synchronizer's operating speed and effectively avoiding the "gear grinding noise" phenomenon generated during the synchronizer's shifting process. From the start to the end of synchronization, the compensation opening duty cycle of the forward solenoid valve is determined based on the second synchronous shift association information of the synchronizer, and a compensation value is added to the control duty cycle of the forward solenoid valve. This compensation value increases the synchronizer's operating speed, effectively avoiding the problem of increased shifting time due to excessively slow synchronizer operation, and shortening the shifting time, thus extending the synchronizer's service life. From the end of synchronization to the completion of the shift, the control duty cycle of the forward solenoid valve is obtained based on the third synchronous shift association information of the synchronizer. The forward solenoid valve is controlled according to the duty cycle, and simultaneously, the reverse solenoid valve is controlled to conduct for a preset time, generating reverse braking force to reduce the synchronizer's operating speed, thereby effectively avoiding end-face impact noise caused by excessive speed at the end of shifting.

[0052] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a flowchart of a synchronizer shifting pneumatic control method provided in Embodiment 1 of the present invention.

[0055] Figure 2 This is a flowchart of a synchronizer shifting pneumatic control method provided in Embodiment 2 of the present invention.

[0056] Figure 3 This is a flowchart of a synchronizer shifting pneumatic control method provided in Embodiment 3 of the present invention.

[0057] Figure 4 This is a schematic diagram of the connection between the shift cylinder and the solenoid valve provided in Embodiment 3 of the present invention. Detailed Implementation

[0058] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0059] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0060] Example 1

[0061] Figure 1 This is a flowchart of a synchronizer shifting pneumatic control method provided in Embodiment 1 of the present invention. This embodiment can be applied to improve the service life of synchronizers and eliminate the "gear-gripping noise" generated during synchronizer shifting and the end-face impact noise generated at the end of shifting. See also Figure 1 The control method includes:

[0062] S110. At the start of gear shifting, obtain the first synchronized gear shifting association information of the synchronizer.

[0063] The first synchronized shifting information of the synchronizer includes: the position information of the synchronizer when the vehicle is in neutral, the current position information of the synchronizer, the position information of the synchronizer when synchronization begins, and the first operating speed of the synchronizer.

[0064] Specifically, at the start of a gear shift, the position sensor obtains the position information of the synchronizer at the current moment, the displacement sensor obtains the displacement of the synchronizer at the current moment, and the synchronizer's operating speed is determined through internal calculations.

[0065] S120. Determine the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve based on the first synchronous shift association information of the synchronizer.

[0066] Specifically, the difference between the current position information of the synchronizer and the position information of the synchronizer when the vehicle is in neutral is calculated, and the difference between the current position information of the synchronizer and the position information of the synchronizer when synchronization begins is calculated. The ratio between the two differences is calculated based on the ratio, and the first opening duty cycle of the positive solenoid valve is determined by looking up the table.

[0067] The synchronizer's first operating speed is determined to be greater than a preset speed. If the synchronizer's first operating speed is greater than the preset speed, the first opening duty cycle of the reverse solenoid valve is determined by looking up a table based on the preset speed and the difference between the preset speed and the first operating speed. If the synchronizer's first operating speed is less than or equal to the preset speed, the synchronizer's first synchronous shifting association information is then acquired.

[0068] S130. Based on the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve, control the opening and closing of the forward solenoid valve and the reverse solenoid valve.

[0069] Specifically, the on / off state of the forward solenoid valve and the reverse solenoid valve is controlled based on the high and low levels of the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve. When the first opening duty cycle of the forward solenoid valve is high, the forward solenoid valve is on; when the first opening duty cycle of the forward solenoid valve is low, the forward solenoid valve is off. Similarly, when the first opening duty cycle of the reverse solenoid valve is high, the reverse solenoid valve is on; when the first opening duty cycle of the reverse solenoid valve is low, the reverse solenoid valve is off.

[0070] S140. Control the synchronizer to enter the synchronization start to synchronization end stage according to the first synchronization shift association information of the synchronizer, and obtain the second synchronization shift association information of the synchronizer.

[0071] The second synchronized shifting information of the synchronizer includes: synchronizer speed, air source pressure, transmission oil temperature and synchronizer operating speed.

[0072] Specifically, based on the synchronizer's current position information, it is determined whether the current position information is greater than or equal to the difference between the synchronizer's initial synchronization position information and the position information at which synchronization began. If the current position information is greater than or equal to the initial synchronization position information, the synchronizer enters the synchronization start-to-end stage. The synchronizer's rotational speed, air source pressure, and transmission oil temperature are acquired using speed, pressure, and temperature sensors, respectively, while the synchronizer's displacement at the current moment is acquired using a displacement sensor. Internal calculations are then performed to determine the synchronizer's operating speed. If the synchronizer's current position information is less than the initial synchronization position information, the process continues to acquire the synchronizer's first synchronization shift association information and subsequent steps.

[0073] S150. Determine the second opening duty cycle of the forward solenoid valve and the compensation opening duty cycle of the forward solenoid valve based on the second synchronous shifting association information of the synchronizer.

[0074] Specifically, the speed difference is calculated based on the synchronizer's speed, and the second opening duty cycle of the positive solenoid valve is determined by referring to a table based on the speed difference; the compensation opening duty cycle of the positive solenoid valve is determined by referring to a table based on the air supply pressure and transmission oil temperature.

[0075] S160. Control the opening and closing of the forward solenoid valve according to the second opening duty cycle of the forward solenoid valve and the compensation opening duty cycle of the forward solenoid valve.

[0076] Specifically, the opening and closing of the forward solenoid valve is controlled by the sum of its second opening duty cycle and its compensated opening duty cycle. When the sum of the second and compensated opening duty cycles is high, the forward solenoid valve is open; when the sum of the second and compensated opening duty cycles is low, the forward solenoid valve is closed.

[0077] S170. Based on the second synchronous shift association information of the synchronizer, control the synchronizer to enter the stage from the end of synchronization to the completion of shifting, and obtain the third synchronous shift association information of the synchronizer.

[0078] The third synchronized shifting information of the synchronizer includes: the fourth operating speed of the synchronizer, the fifth operating speed of the synchronizer, the current position information of the synchronizer, and the position information of the synchronizer when the shift is completed.

[0079] Specifically, based on the synchronizer's fourth operating speed, it is determined whether this fourth operating speed is greater than a preset speed. If the fourth operating speed is greater than the preset speed, the synchronizer enters the stage from the end of synchronization to the completion of gear shifting. The position information of the synchronizer at the current moment is obtained through a position sensor, and the displacement information of the synchronizer at the current moment is obtained through a displacement sensor. After internal calculation, the operating speed of the synchronizer is determined. If the fourth operating speed is less than or equal to the preset speed, the compensation opening duty cycle of the positive solenoid valve is determined by referring to a table based on the air source pressure and transmission oil temperature.

[0080] S180. Control the opening and closing of the forward solenoid valve and the opening and closing of the reverse solenoid valve according to the third synchronous shift association information of the synchronizer.

[0081] Specifically, based on the synchronizer's fifth operating speed, it is determined whether the fifth operating speed is greater than the preset speed. If the fifth operating speed is greater than the preset speed, the reverse solenoid valve is fully open with a 100% duty cycle. After a certain period of time, the reverse solenoid valve closes with a 0% duty cycle. If the fifth operating speed is less than or equal to the preset speed, the reverse solenoid valve remains closed with a 0% duty cycle.

[0082] The technical solution provided by this invention involves: acquiring first synchronous shifting association information of the synchronizer at the start of shifting; determining the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve based on the first synchronous shifting association information; controlling the on / off state of the forward solenoid valve and the reverse solenoid valve based on the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve; controlling the synchronizer to enter the synchronization start to synchronization end stage based on the first synchronous shifting association information of the synchronizer, and acquiring the second synchronous shifting information of the synchronizer. The system includes: determining the second opening duty cycle and the compensated opening duty cycle of the forward solenoid valve based on the second synchronous shifting correlation information of the synchronizer; controlling the on / off state of the forward solenoid valve based on its second opening duty cycle and compensated opening duty cycle; controlling the synchronizer to enter the synchronization end to shift completion stage based on its second synchronous shifting correlation information, and acquiring the third synchronous shifting correlation information of the synchronizer; and controlling the on / off state of the forward solenoid valve and the reverse solenoid valve based on the third synchronous shifting correlation information of the synchronizer.

[0083] The technical solution provided by this invention controls the operation of the forward solenoid valve and the reverse solenoid valve based on the first synchronous shift association information of the synchronizer at the start of shifting, thereby enabling precise control of the synchronizer's operating speed and effectively avoiding the "gear grinding noise" phenomenon generated during the synchronizer's shifting process. From the start to the end of synchronization, the compensation opening duty cycle of the forward solenoid valve is determined based on the second synchronous shift association information of the synchronizer, and a compensation value is added to the control duty cycle of the forward solenoid valve. This compensation value increases the synchronizer's operating speed, effectively avoiding the problem of increased shifting time due to excessively slow synchronizer operation, and shortening the shifting time, thus extending the synchronizer's service life. From the end of synchronization to the completion of the shift, the control duty cycle of the forward solenoid valve is obtained based on the third synchronous shift association information of the synchronizer. The forward solenoid valve is controlled according to the duty cycle, and simultaneously, the reverse solenoid valve is controlled to conduct for a preset time, generating reverse braking force to reduce the synchronizer's operating speed, thereby effectively avoiding end-face impact noise caused by excessive speed at the end of shifting.

[0084] Example 2

[0085] Figure 2 This is a flowchart of a synchronizer shifting pneumatic control method provided in Embodiment 2 of the present invention. This embodiment further refines the aforementioned embodiments based on the previous embodiments. See also... Figure 2 The control method includes:

[0086] S210. At the start of gear shifting, acquire the position information of the synchronizer when it starts working, the position information of the synchronizer when the vehicle is in neutral, the current position information of the synchronizer, the position information of the synchronizer when it starts synchronizing, and the first running speed of the synchronizer.

[0087] Specifically, the first operating speed can be understood as the operating speed of the synchronizer at the moment the gear shift begins.

[0088] S211. Calculate the first position difference based on the current position information of the synchronizer and the position information of the synchronizer when the vehicle is in neutral.

[0089] Specifically, the synchronizer's current position information can be understood as the position of the synchronizer's synchronizing gear when the synchronizer is working; the synchronizer's position information when the vehicle is in neutral can be understood as the position of the synchronizer's synchronizing gear when the vehicle is in neutral; and the first position difference can be understood as the difference between the synchronizer's current position information and the synchronizer's position information when the vehicle is in neutral.

[0090] Specifically, the transmission controller calculates the difference between the current position information of the synchronizer and the position information of the synchronizer when the vehicle is in neutral, and obtains the first position difference, which provides data support for the subsequent control of the positive solenoid valve.

[0091] S212. Calculate the second position difference based on the current position information of the synchronizer and the position information at which the synchronizer begins to synchronize.

[0092] Specifically, the synchronizer's current position information can be understood as the current position of the synchronizer's synchronizing side gear when the shift begins; the synchronizer's starting synchronization position information can be understood as the current position of the synchronizer's synchronizing side gear when the synchronizer starts synchronizing; and the second position difference can be understood as the difference between the synchronizer's current position information and the synchronizer's starting synchronization position information.

[0093] Specifically, the gearbox controller calculates the difference between the current position information of the synchronizer and the position information at which the synchronizer begins to synchronize, and obtains the second position difference, which provides data support for the subsequent control of the positive solenoid valve.

[0094] S213. Calculate the ratio between the second position difference and the first position difference, and determine the first opening duty cycle of the positive solenoid valve by querying the first calibration table based on the ratio.

[0095] Specifically, the first calibration table can be understood as a table containing the corresponding relationship between the synchronizer's operating speed, position information, operating time, and the ratio between the two values ​​derived from the second position difference and the first position difference.

[0096] Specifically, the gearbox controller determines the first opening duty cycle of the positive solenoid valve by querying a table containing data information such as synchronizer operating speed, position information, operating time, and the ratio between the two, based on the ratio between the second position difference and the first position difference. When the synchronizer operating speed, position information, operating time, and the ratio between the two are constant, there is a unique corresponding valve opening duty cycle.

[0097] S214. Determine whether the first running speed is greater than the first preset speed; if yes, execute S215; if no, return to execute S210.

[0098] The first preset speed can be preset, and the first preset speed can be understood as the maximum speed at which the synchronizer runs.

[0099] S215. Determine the first opening duty cycle of the reverse solenoid valve by consulting the first calibration table based on the preset speed and the difference between the preset speed and the first operating speed.

[0100] Specifically, if the synchronizer's operating speed is greater than the first preset speed at the start of the shift, the first opening duty cycle of the reverse solenoid valve is determined by querying the first calibration table based on the preset speed and the difference between the preset speed and the first operating speed. The reverse solenoid valve operates according to the first opening duty cycle, continues to acquire the synchronizer's second operating speed, and determines whether the second operating speed is less than the second preset speed. If the second operating speed is less than the second preset speed, the reverse solenoid valve is closed. If the second operating speed is greater than or equal to the second preset speed, the synchronizer's operating speed is acquired until the synchronizer's operating speed is less than the second preset speed.

[0101] S216. Determine whether the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer started synchronizing; if yes, execute S217; otherwise, return to execute S210.

[0102] S217. Control the synchronizer to enter the synchronization start to synchronization end stage, and obtain the speed of the synchronizer's synchronized side, the speed of the synchronized gear on the synchronized side, the third running speed of the synchronizer, the current air supply pressure of the air tank, and the oil temperature in the gearbox.

[0103] Specifically, the rotational speed of the synchronizer's synchronization side can be understood as the rotational speed of the synchronizer's synchronization side gear; the third operating speed of the synchronizer can be understood as the current operating speed of the synchronizer when it enters the synchronization start-to-end stage.

[0104] S218. Calculate the difference between the speed of the synchronizing side of the synchronizer and the speed of the gear on the synchronized side of the synchronizer.

[0105] S219. Determine the second opening duty cycle of the positive solenoid valve by consulting the second calibration table based on the difference.

[0106] The second calibration table can be understood as a table containing data on synchronizer speed, operating speed, current air pressure in the air reservoir, oil temperature in the gearbox, operating time, the difference between the synchronizer speed and the synchronized gear speed, and the relationship between the current air pressure in the air reservoir and the oil temperature in the gearbox.

[0107] Specifically, the transmission controller calculates the difference between the speed of the synchronizer's synchronizing gear and the second position difference, and the speed of the synchronized gear. It then queries a table containing data on the corresponding relationships between the synchronizer's synchronizing gear speed, synchronized gear speed, operating speed, position information, operating time, the difference between the two, the current air supply pressure in the air reservoir, and the oil temperature in the transmission. Since there is a unique corresponding valve opening duty cycle when the synchronizer's synchronizing gear speed, synchronized gear speed, operating speed, position information, operating time, and the ratio between the two are constant, the second valve opening duty cycle of the positive solenoid valve is determined.

[0108] S220. Based on the current air supply pressure in the air reservoir and the oil temperature in the gearbox, consult the second calibration table to determine the compensation opening duty cycle of the positive solenoid valve.

[0109] Specifically, the transmission controller, based on the current air pressure supplied to the air reservoir and the oil temperature inside the transmission, queries a table showing the correspondence between the speed of the synchronizer gear, the speed of the synchronized gear, the operating speed, position information, operating time, the difference between the two, and the data information of the current air pressure supplied to the air reservoir and the oil temperature inside the transmission. Since the current air pressure supplied to the air reservoir and the oil temperature inside the transmission have a unique corresponding valve opening duty cycle when they are constant, the controller then determines the compensating valve opening duty cycle of the positive solenoid valve.

[0110] S221. Control the opening and closing of the forward solenoid valve based on the sum of the compensated opening duty cycle of the forward solenoid valve and the second opening duty cycle of the forward solenoid valve.

[0111] Specifically, the transmission controller calculates the sum of the compensated opening duty cycle of the forward solenoid valve and the second opening duty cycle of the forward solenoid valve, and controls the opening and closing of the forward solenoid valve according to the opening duty cycle of the sum of the two. When the opening duty cycle of the sum of the two is high, the forward solenoid valve is controlled to open; when the opening duty cycle of the sum of the two is low, the forward solenoid valve is controlled to close.

[0112] S222. Determine whether the third running speed is greater than the third preset speed; if yes, execute S223; if no, return to execute S220.

[0113] The third operating speed can be specifically understood as the operating speed of the synchronizer after the compensation opening duty cycle of the positive solenoid valve is added to the second opening duty cycle of the positive solenoid valve; the third preset speed can be preset, and the third preset speed can be specifically understood as the operating speed of the synchronizer when the synchronizer stops working.

[0114] S223. Control the synchronizer to enter the stage from the end of synchronization to the completion of shifting, and obtain the fourth running speed of the synchronizer, the fifth running speed of the synchronizer, the current position information of the synchronizer, and the position information of the synchronizer when shifting is completed.

[0115] Specifically, the fourth operating speed can be understood as the current operating speed of the synchronizer when it enters the stage from the end of synchronization to the completion of gear shifting; the fifth operating speed can be understood as the operating speed of the synchronizer when the positive solenoid valve performs the action according to the third opening duty cycle; the position information of the synchronizer when gear shifting is completed can be understood as the position of the synchronizer's synchronizing side gear when the vehicle completes gear shifting.

[0116] S224. Determine the third opening duty cycle of the positive solenoid valve by consulting the third calibration table based on the fourth operating speed of the synchronizer.

[0117] The third calibration table can be specifically understood as a table containing the correspondence between the fourth operating speed of the synchronizer, the fifth operating speed of the synchronizer, the current position information of the synchronizer, and the position information of the synchronizer when the gear shift is completed.

[0118] Specifically, the transmission controller determines the third opening duty cycle of the forward solenoid valve based on the synchronizer's current operating speed when the synchronizer enters the synchronization end to the gear shift completion stage. This is achieved by querying a table containing the correspondence between the synchronizer's fourth operating speed, fifth operating speed, current position information, and position information when the gear shift is completed. Since the synchronizer's current operating speed is a constant value when the synchronizer enters the synchronization end to the gear shift completion stage, there is a unique corresponding valve opening duty cycle. The controller then controls the forward solenoid valve's opening and closing based on this third opening duty cycle.

[0119] S225. Control the opening and closing of the forward solenoid valve according to the third opening duty cycle of the forward solenoid valve.

[0120] Specifically, the transmission controller controls the opening and closing of the forward solenoid valve based on the third opening duty cycle of the forward solenoid valve; when the third opening duty cycle is high, it controls the forward solenoid valve to open; when the third opening duty cycle is low, it controls the forward solenoid valve to close.

[0121] S226. Determine whether the fifth running speed is greater than the fourth preset speed; if yes, execute S227; if no, execute S228.

[0122] The fourth preset speed can be preset. Specifically, the fourth preset speed can be understood as the maximum operating speed of the synchronizer after the synchronizer enters the stage from the end of synchronization to the completion of gear shifting.

[0123] S227. Control the reverse solenoid valve to open, and after a preset time, control the reverse solenoid valve to close.

[0124] Specifically, if the fifth operating speed of the synchronizer is greater than the fourth preset speed, the reverse solenoid valve is controlled to be fully turned on with a third opening duty cycle of 100% for a preset time. After the preset time, the reverse solenoid valve is controlled to be fully turned off with a third opening duty cycle of 0%.

[0125] S228. Determine whether the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the shift is completed; if yes, execute S229; if no, return to execute S223.

[0126] S229, Controls the shut-off of the forward solenoid valve and the shut-off of the reverse solenoid valve.

[0127] The technical solution provided by this invention controls the operation of the forward solenoid valve based on the synchronizer's position information at the start of gear shifting, and controls the operation of the reverse solenoid valve based on the synchronizer's speed information. This allows for precise control of the synchronizer's operating speed, effectively avoiding the "gear-gripping noise" phenomenon during gear shifting. From the start to the end of synchronization, the compensation opening duty cycle of the forward solenoid valve is determined based on the synchronizer's second synchronization shifting association information, and a compensation value is added to the control duty cycle of the forward solenoid valve. This compensation value increases the synchronizer's operating speed, effectively avoiding the problem of increased shifting time due to excessively slow synchronizer operation, and shortening the shifting time, thus extending the synchronizer's service life. From the end of synchronization to the completion of gear engagement, the control duty cycle of the forward solenoid valve is obtained by looking up the synchronizer's speed information in a table. The forward solenoid valve is then controlled to operate according to the duty cycle, while the reverse solenoid valve is controlled to conduct for a preset time, generating reverse braking force to reduce the synchronizer's operating speed. This effectively avoids end-face impact noise caused by excessive speed at the end of gear shifting.

[0128] Example 3

[0129] Figure 3 This is a flowchart of a synchronizer shifting pneumatic control method provided in Embodiment 3 of the present invention. This embodiment further refines the aforementioned embodiments. See also... Figure 3 The pneumatic control method for shifting gears using the synchronizer specifically includes:

[0130] S301, At the start of gear shift, obtain the current position information of the synchronizer, the position information of the synchronizer when the vehicle is in neutral, the position information of the synchronizer when synchronization begins, and the position information of the synchronizer when gear shift is completed.

[0131] S302, Obtain the first operating speed of the synchronizer.

[0132] S303. Calculate the first position difference based on the current position information of the synchronizer and the position information of the synchronizer when the vehicle is in neutral.

[0133] S304. Calculate the second position difference based on the current position information of the synchronizer and the position information at which the synchronizer begins synchronization.

[0134] S305. Calculate the ratio between the second position difference and the first position difference, and determine the first opening duty cycle of the positive solenoid valve by querying the first calibration table based on the ratio.

[0135] S306. Determine whether the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer started synchronizing; if yes, execute S312; if no, return to execute S301.

[0136] S307 is executed after S302;

[0137] S307. Determine whether the first running speed is greater than the first preset speed; if yes, execute S308; if no, return to execute S302.

[0138] S308. Determine the first opening duty cycle of the reverse solenoid valve by querying the first calibration table based on the preset speed and the difference between the preset speed and the first operating speed.

[0139] S309, Obtain the second operating speed of the synchronizer.

[0140] S310. Determine whether the second running speed is less than the second preset speed; if yes, execute S311; if no, return to execute S309.

[0141] S311, Control the reverse solenoid valve to shut off and return to execute S306.

[0142] S312, control the synchronizer to enter the synchronization start to synchronization end stage, and obtain the speed of the synchronizer synchronization side, the speed of the synchronized gear side, the third running speed of the synchronizer, the current air supply pressure of the air tank and the oil temperature in the gearbox.

[0143] S303. Calculate the difference between the speed of the synchronizing side of the synchronizer and the speed of the gear on the synchronized side of the synchronizer.

[0144] S314. Determine the second opening duty cycle of the positive solenoid valve by consulting the second calibration table based on the difference.

[0145] S315. Based on the current air supply pressure in the air reservoir and the oil temperature in the gearbox, consult the second calibration table to determine the compensation opening duty cycle of the positive solenoid valve.

[0146] S316. Control the opening and closing of the forward solenoid valve based on the sum of the compensated opening duty cycle of the forward solenoid valve and the second opening duty cycle of the forward solenoid valve.

[0147] S317. Determine whether the third running speed is greater than the third preset speed; if yes, execute S318; if no, return to execute S315.

[0148] S318. Control the synchronizer to enter the stage from the end of synchronization to the completion of shifting, and obtain the fourth running speed of the synchronizer, the fifth running speed of the synchronizer, the current position information of the synchronizer, and the position information of the synchronizer when shifting is completed.

[0149] S319. Determine the third opening duty cycle of the positive solenoid valve by consulting the third calibration table based on the fourth operating speed of the synchronizer.

[0150] S320. Control the opening and closing of the forward solenoid valve according to the third opening duty cycle of the forward solenoid valve.

[0151] S321. Determine whether the fifth running speed is greater than the fourth preset speed; if yes, execute S322; otherwise, execute S323.

[0152] S322: Control the reverse solenoid valve to open, and after a preset time, control the reverse solenoid valve to close.

[0153] S323. Determine whether the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the shift is completed; if yes, execute S324; if no, return to execute S318.

[0154] S324: Control the forward solenoid valve to close and the reverse solenoid valve to close, thus ending the gear shift.

[0155] Figure 4 This is a schematic diagram of the connection between the shift cylinder and the solenoid valve according to Embodiment 3 of the present invention. See also Figure 4 The structural diagram of the connection between the shift cylinder and the solenoid valve includes: a forward intake channel 410, a reverse intake channel 420, a forward solenoid valve 430, a reverse solenoid valve 440, a shift cylinder 450, a piston 460, a forward solenoid valve exhaust channel 470, and a reverse solenoid valve exhaust channel 480.

[0156] The working process is as follows: When the piston needs to move to the right, the forward solenoid valve 430 is turned on, and compressed air enters the bottom of the shift cylinder 450 through the forward intake channel 410 and the forward solenoid valve 430. The compressed air in the shift cylinder causes the piston 460 to move to the right. When the forward solenoid valve 430 is closed, the compressed air in the shift cylinder 450 is discharged through the forward solenoid valve exhaust channel 470. Similarly, when the piston needs to move to the left, the reverse solenoid valve 440 is turned on, and compressed air enters the bottom of the shift cylinder 450 through the reverse intake channel 420 and the reverse solenoid valve 440. The compressed air in the shift cylinder causes the piston 460 to move to the left. When the reverse solenoid valve 440 is closed, the compressed air in the shift cylinder 450 is discharged through the reverse solenoid valve exhaust channel 480.

[0157] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and no limitation is imposed herein.

[0158] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A pneumatic control method for synchronizer shifting, characterized in that, include At the start of gear shifting, acquire the first synchronized gear shifting association information of the synchronizer; The first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve are determined based on the first synchronous shift association information of the synchronizer. The opening and closing of the forward solenoid valve and the opening and closing of the reverse solenoid valve are controlled according to the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve. The synchronizer is controlled to enter the synchronization start to synchronization end stage according to the first synchronization shift association information of the synchronizer, and the second synchronization shift association information of the synchronizer is obtained. The second opening duty cycle of the forward solenoid valve and the compensation opening duty cycle of the forward solenoid valve are determined based on the second synchronous shift association information of the synchronizer. The opening and closing of the positive solenoid valve are controlled according to the second opening duty cycle of the positive solenoid valve and the compensation opening duty cycle of the positive solenoid valve. According to the second synchronous shift association information of the synchronizer, the synchronizer is controlled to enter the stage from the end of synchronization to the completion of shifting, and the third synchronous shift association information of the synchronizer is obtained; The opening and closing of the forward solenoid valve and the opening and closing of the reverse solenoid valve are controlled according to the third synchronous shift association information of the synchronizer.

2. The method according to claim 1, characterized in that, The first synchronous shift association information of the synchronizer includes: the position information of the synchronizer when the vehicle is in neutral, the current position information of the synchronizer, the position information at which the synchronizer starts to synchronize, and the first operating speed of the synchronizer. The step of determining the first opening duty cycle of the forward solenoid valve and the first opening duty cycle of the reverse solenoid valve based on the first synchronous shifting association information of the synchronizer includes: Calculate the first position difference based on the current position information of the synchronizer and the position information of the synchronizer when the vehicle is in neutral. The second position difference is calculated based on the current position information of the synchronizer and the position information at which the synchronizer begins to synchronize; wherein, the current position information of the synchronizer can be specifically understood as the current position of the synchronizer's synchronizing side gear at the start of gear shift; the position information at which the synchronizer begins to synchronize can be specifically understood as the current position of the synchronizer's synchronizing side gear at the start of synchronization. The ratio between the second position difference and the first position difference is calculated, and the first opening duty cycle of the positive solenoid valve is determined by querying the first calibration table based on the ratio. Determine whether the first running speed is greater than the first preset speed; When the first operating speed is greater than the first preset speed, the first opening duty cycle of the reverse solenoid valve is determined by querying the first calibration table based on the first preset speed and the difference between the first preset speed and the first operating speed.

3. The method according to claim 2, characterized in that, Controlling the synchronizer to enter the synchronization start to synchronization end phase according to the first synchronization shift association information of the synchronizer includes: Determine whether the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer started synchronizing; When the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer begins synchronization, the synchronizer is controlled to enter the synchronization start to synchronization end stage.

4. The method according to claim 3, characterized in that, After determining whether the current position information of the synchronizer is greater than or equal to the position information at which the synchronizer started synchronizing, the method further includes: When the current position information of the synchronizer is less than the position information at which the synchronizer begins synchronization, the first synchronization shift association information of the synchronizer continues to be acquired.

5. The method according to claim 1, characterized in that, The second synchronized shift association information of the synchronizer includes: the rotational speed of the synchronizer's synchronized side, the rotational speed of the synchronized gear on the synchronized side, the current air supply pressure of the air reservoir, and the oil temperature in the transmission. The step of determining the second opening duty cycle of the positive solenoid valve and the compensated opening duty cycle of the positive solenoid valve based on the second synchronous shift association information of the synchronizer includes: The difference between the rotational speed of the synchronizing side of the synchronizer and the rotational speed of the gear on the synchronized side of the synchronizer is calculated. The second opening duty cycle of the positive solenoid valve is determined by querying the second calibration table based on the difference. The compensation opening duty cycle of the positive solenoid valve is determined by consulting the second calibration table based on the current air supply pressure of the air reservoir and the oil temperature in the gearbox.

6. The method according to claim 1, characterized in that, The step of controlling the opening and closing of the positive solenoid valve based on the second opening duty cycle of the positive solenoid valve and the compensated opening duty cycle of the positive solenoid valve includes: The opening and closing of the forward solenoid valve are controlled by the sum of the compensated opening duty cycle of the forward solenoid valve and the second opening duty cycle of the forward solenoid valve.

7. The method according to claim 5, characterized in that, The second synchronous shift association information of the synchronizer also includes: the third operating speed of the synchronizer; The step of controlling the synchronizer to enter the stage from the end of synchronization to the completion of gear shifting based on the second synchronization shift association information of the synchronizer includes: Determine whether the third operating speed is greater than the third preset speed; When the third operating speed is greater than the third preset speed, the synchronizer is controlled to enter the synchronization end to shift completion stage.

8. The method according to claim 7, characterized in that, After determining whether the third operating speed is greater than the third preset speed, the process further includes: When the third operating speed is less than or equal to the third preset speed, the compensation opening duty cycle of the positive solenoid valve is determined by consulting the second calibration table based on the current air supply pressure of the air reservoir and the oil temperature in the gearbox.

9. The method according to claim 1, characterized in that, The third synchronous shift association information of the synchronizer includes: the fourth operating speed of the synchronizer, the fifth operating speed of the synchronizer, the current position information of the synchronizer, and the position information of the synchronizer when the shift is completed; The control of the forward solenoid valve's opening and closing, and the reverse solenoid valve's opening and closing based on the third synchronous shift association information of the synchronizer, includes: The third opening duty cycle of the positive solenoid valve is determined by querying the third calibration table based on the fourth operating speed of the synchronizer. The opening and closing of the positive solenoid valve are controlled according to the third opening duty cycle of the positive solenoid valve. Determine whether the fifth operating speed is greater than the fourth preset speed; When the fifth operating speed is greater than the fourth preset speed, the reverse solenoid valve is controlled to open, and after a preset time, the reverse solenoid valve is controlled to close. Determine whether the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the gear shift is completed; If the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the shift is completed, then the forward solenoid valve and the reverse solenoid valve are controlled to be turned off. If the current position information of the synchronizer is less than the position information of the synchronizer when the shift is completed, then the third synchronized shift association information of the synchronizer is obtained.

10. The method according to claim 9, characterized in that, After determining whether the fifth operating speed is greater than the fourth preset speed, the method further includes: When the fifth operating speed is less than or equal to the fourth preset speed, it is determined whether the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the gear shift is completed; When the current position information of the synchronizer is greater than or equal to the position information of the synchronizer when the shift is completed, the forward solenoid valve and the reverse solenoid valve are controlled to close.

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