Double-clutch transmission reverse gear control method and vehicle

Abstract

The invention provides a reverse gear control method for a dual-clutch transmission, and belongs to the field of transmission control, under the condition that a reverse gear and a preset forward gear share one synchronizer, when it is monitored that the synchronizer and a reverse gear are not synchronized successfully, that is, the reverse gear fails to be engaged, the synchronizer is controlled to move in the opposite direction, and the reverse gear is engaged. The synchronizer is firstly synchronized with the preset forward gear, so that the position of the synchronizer is finely adjusted, then the synchronizer and the preset forward gear are disconnected, and the synchronizer and the reverse gear are tried to be synchronized again; due to the fact that the position of the synchronizer is finely adjusted through the preset forward gear corresponding to the reverse gear, the success rate of mutual synchronization of the synchronizer and the reverse gear is increased, and the success rate of engaging the reverse gear is increased.

Description

Technical Field

[0001] The present application relates to the field of transmission control, and in particular to a dual-clutch transmission reverse gear control method and a vehicle. Background Art

[0002] Due to its advantages such as fast shifting speed, dual-clutch transmission has been favored by major car manufacturers, and more and more car models are choosing to be equipped with dual-clutch transmission.

[0003] As an important component in the transmission, the synchronizer is used to synchronize the positions of the two gears that are about to mesh to avoid tooth collision. The synchronizer with a double-cone structure can increase the synchronization torque and make the two gears mesh better. However, in order to reduce manufacturing and assembly costs, the reverse synchronizer of the dual-clutch transmission mostly adopts a single-cone structure, which can provide a smaller synchronization torque than the synchronizer with a double-cone structure.

[0004] Due to the special gear ratio of the reverse gear, the shifting force required to engage the reverse gear is relatively large. If there is a large difference in position between the reverse gear synchronizer with a single-cone structure and the reverse gear, especially when the temperature is low and the viscosity of the lubricating oil is low, the synchronizing torque provided by the reverse gear synchronizer with a single-cone structure may not be sufficient to synchronize the difference, resulting in sticking and inability to engage the reverse gear. Summary of the invention

[0005] In view of this, the present application provides a dual-clutch transmission reverse gear control method, which can improve the success rate of engaging reverse gear:

[0006] In one aspect, the present application provides a dual-clutch transmission reverse gear control method, the method comprising:

[0007] When receiving the reverse gear shifting command, the synchronizer is controlled to move toward the reverse gear, and the synchronizer and the reverse gear are monitored to see whether they are synchronized successfully.

[0008] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear gear, so that the synchronizer and the preset forward gear gear are synchronized with each other. The preset forward gear gear and the reverse gear share a synchronizer, and the preset forward gear gear and the reverse gear are respectively located at both ends of the synchronizer.

[0009] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0010] Optionally, the method further comprises:

[0011] When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than a preset number.

[0012] When it is determined that the number of synchronization failures is not greater than the preset number, the synchronizer is controlled to first separate from the reverse gear and then move toward the direction close to the reverse gear again.

[0013] When it is determined that the number of synchronization failures is greater than the preset number, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move in the direction close to the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

[0014] Optionally, after disconnecting the synchronizer from the preset forward gear and controlling the synchronizer to move toward the reverse gear, the method further includes:

[0015] Monitor whether the synchronizer and reverse gear are synchronized successfully.

[0016] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear gear, so that the synchronizer and the preset forward gear gear are synchronized with each other. The preset forward gear gear and the reverse gear share a synchronizer, and the preset forward gear gear and the reverse gear are respectively located at both ends of the synchronizer.

[0017] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0018] Optionally, the method further comprises:

[0019] When receiving the reverse gear shifting command, the synchronizer is controlled to move toward the reverse gear, and the synchronizer and the reverse gear are monitored to see whether they are synchronized successfully.

[0020] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully and the engine oil temperature is lower than the preset temperature, the synchronizer is controlled to move in the direction away from the reverse gear and closer to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other. The preset forward gear and the reverse gear share a synchronizer, and the preset forward gear and the reverse gear are respectively located at the two ends of the synchronizer.

[0021] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0022] Optionally, the preset forward gear corresponding to the preset forward gear gear is an even-numbered gear.

[0023] On the other hand, the present application provides a vehicle, the vehicle comprising a transmission controller, a synchronizer, a reverse gear, and a preset forward gear, wherein the transmission controller is configured as follows:

[0024] When receiving the reverse gear shifting command, the synchronizer is controlled to move toward the reverse gear, and the synchronizer and the reverse gear are monitored to see whether they are synchronized successfully.

[0025] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear gear, so that the synchronizer and the preset forward gear gear are synchronized with each other. The preset forward gear gear and the reverse gear share a synchronizer, and the preset forward gear gear and the reverse gear are respectively located at both ends of the synchronizer.

[0026] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0027] Optionally, the transmission controller is further configured to:

[0028] When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than a preset number.

[0029] When it is determined that the number of synchronization failures is not greater than the preset number, the synchronizer is controlled to first separate from the reverse gear and then move toward the direction close to the reverse gear again.

[0030] When it is determined that the number of synchronization failures is greater than the preset number, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move in the direction close to the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

[0031] Optionally, the transmission controller is further configured to:

[0032] After disconnecting the connection between the synchronizer and the preset forward gear and controlling the synchronizer to move toward the reverse gear, monitor whether the synchronizer and the reverse gear are synchronized successfully.

[0033] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear gear, so that the synchronizer and the preset forward gear gear are synchronized with each other. The preset forward gear gear and the reverse gear share a synchronizer, and the preset forward gear gear and the reverse gear are respectively located at both ends of the synchronizer.

[0034] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0035] Optionally, the transmission controller is further configured to:

[0036] When receiving the reverse gear shifting command, the synchronizer is controlled to move toward the reverse gear, and the synchronizer and the reverse gear are monitored to see whether they are synchronized successfully.

[0037] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully and the engine oil temperature is lower than the preset temperature, the synchronizer is controlled to move in the direction away from the reverse gear and closer to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other. The preset forward gear and the reverse gear share a synchronizer, and the preset forward gear and the reverse gear are respectively located at the two ends of the synchronizer.

[0038] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0039] Optionally, the preset forward gear corresponding to the preset forward gear gear is an even-numbered gear.

[0040] By adopting the reverse gear control method of the dual-clutch transmission provided by the present application, when the reverse gear and a preset forward gear share a synchronizer, when it is monitored that the synchronizer and the reverse gear gear are not synchronized successfully, that is, the reverse gear engagement fails, the synchronizer is controlled to move in the opposite direction, so that the synchronizer is first synchronized with the preset forward gear gear, thereby fine-tuning the position of the synchronizer, and then disconnecting the connection between the synchronizer and the preset forward gear gear, and attempting to synchronize the synchronizer and the reverse gear again. Since the position of the synchronizer is first fine-tuned using the preset forward gear gear corresponding to the reverse gear, the success rate of synchronization between the synchronizer and the reverse gear is increased, and the success rate of engaging the reverse gear is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A flowchart of a reverse gear control method for a dual clutch transmission provided in an embodiment of the present application;

[0043] Figure 2 Another flow chart of the reverse gear control method of a dual clutch transmission provided in an embodiment of the present application;

[0044] Figure 3 An architectural diagram of a vehicle provided in an embodiment of the present application;

[0045] Figure 4 Another structural diagram of a vehicle provided in an embodiment of the present application;

[0046] Figure 5 Another architectural diagram of a vehicle provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Due to cost pressure, the reverse synchronizer of the dual-clutch transmission mostly adopts a single cone structure, which will make the reverse gear synchronization torque small, while the shift force required for reverse gear is large, resulting in a stuck phenomenon, or the inability to shift into reverse gear, etc. Especially in the north in winter when the temperature is low, the viscosity of the lubricating oil is low, and the lubrication is insufficient, this problem is more likely to occur when starting the vehicle for the first time.

[0049] The purpose of the present invention is to effectively solve the problem of being unable to engage the reverse gear in winter by only changing the software control strategy and the reverse gear shifting control process without increasing the cost of the bicycle, thereby reducing complaints from end consumers and improving the reputation of the product.

[0050] The embodiment of the present application provides a reverse gear control method for a dual clutch transmission, which is implemented by a transmission controller, such as Figure 1 As shown, the method includes steps S101, S102 and S103, wherein:

[0051] In step S101, when a reverse gear shifting instruction is received, the synchronizer is controlled to move toward the reverse gear, and it is monitored whether the synchronizer and the reverse gear are synchronized successfully.

[0052] In step S102, when it is detected that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in a direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other.

[0053] The preset forward gear position gear and the reverse gear position gear share a synchronizer, and the preset forward gear position gear and the reverse gear position gear are respectively located at two ends of the synchronizer.

[0054] In step S103, the connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0055] In some optional embodiments, the method further comprises:

[0056] When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than a preset number.

[0057] When it is determined that the number of synchronization failures is not greater than the preset number, the synchronizer is controlled to first separate from the reverse gear and then move toward the direction close to the reverse gear again.

[0058] When it is determined that the number of synchronization failures is greater than the preset number, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move in the direction close to the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

[0059] In some optional embodiments, after disconnecting the synchronizer from the preset forward gear and controlling the synchronizer to move toward the reverse gear, the method further includes:

[0060] Monitor whether the synchronizer and reverse gear are synchronized successfully.

[0061] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear gear, so that the synchronizer and the preset forward gear gear are synchronized with each other. The preset forward gear gear and the reverse gear share a synchronizer, and the preset forward gear gear and the reverse gear are respectively located at both ends of the synchronizer.

[0062] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0063] In some optional embodiments, the method further comprises:

[0064] When receiving the reverse gear shifting command, the synchronizer is controlled to move toward the reverse gear, and the synchronizer and the reverse gear are monitored to see whether they are synchronized successfully.

[0065] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully and the engine oil temperature is lower than the preset temperature, the synchronizer is controlled to move in the direction away from the reverse gear and closer to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other. The preset forward gear and the reverse gear share a synchronizer, and the preset forward gear and the reverse gear are respectively located at the two ends of the synchronizer.

[0066] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0067] In some optional embodiments, the preset forward gear corresponding to the preset forward gear gear is an even gear.

[0068] By adopting the reverse gear control method of the dual-clutch transmission provided by the present application, when the reverse gear and a preset forward gear share a synchronizer, when it is monitored that the synchronizer and the reverse gear gear are not synchronized successfully, that is, the reverse gear engagement fails, the synchronizer is controlled to move in the opposite direction, so that the synchronizer is first synchronized with the preset forward gear gear, thereby fine-tuning the position of the synchronizer, and then disconnecting the connection between the synchronizer and the preset forward gear gear, and attempting to synchronize the synchronizer and the reverse gear again. Since the position of the synchronizer is first fine-tuned using the preset forward gear gear corresponding to the reverse gear, the success rate of synchronization between the synchronizer and the reverse gear is increased, and the success rate of engaging the reverse gear is improved.

[0069] The present application also provides another dual clutch transmission reverse gear control method, which is implemented by a transmission controller, such as Figure 2 As shown, the method includes steps S201, S202, S203, S204 and S205, wherein:

[0070] In step S201, when a reverse gear shifting instruction is received, the synchronizer is controlled to move toward the reverse gear, and it is monitored whether the synchronizer and the reverse gear are synchronized successfully.

[0071] In some optional embodiments, the preset forward gear corresponding to the preset forward gear gear is an even gear.

[0072] Therefore, the clutches corresponding to the preset forward gear and reverse gear are all even-numbered clutches, and when the reverse gear engaging command is received, the even-numbered clutch is engaged. Correspondingly, an odd-numbered clutch is also provided for engaging the 1st, 3rd and 5th gears. Since the current automatic transmission vehicle models mostly adopt the wire control mode for the shifting operation, that is, the gear lever and the mechanical structure in the gearbox are not directly connected mechanically, the driver's operation of the gear lever is only used to trigger the shifting command, rather than directly using the mechanical direct connection to drive the mechanical structure in the gearbox. After the shifting command is triggered, the gearbox controller will further receive the shifting command, and then the gearbox controller will control the corresponding mechanical structure in the gearbox to complete the shifting. Specifically, when the gearbox controller receives the reverse gear engaging command, it will control the synchronizer to move in the direction close to the reverse gear, and monitor whether the synchronizer and the reverse gear are synchronized successfully. The synchronizer here refers to the synchronizer used for the reverse gear.

[0073] The synchronizer includes a gear sleeve and a cone surface. The transmission controller controls the movement of the synchronizer, which may refer to controlling the movement of the gear sleeve of the synchronizer through a shift fork, thereby ultimately achieving engagement or disengagement with a specific gear position.

[0074] Specifically, a sensor may be used to determine whether the synchronizer and the reverse gear are successfully synchronized. A position sensor may be used to determine whether the synchronizer or the reverse gear is rotated, thereby determining whether the synchronizer and the reverse gear are successfully synchronized. A torque sensor may also be used to determine whether the torque of the synchronizer, the reverse gear, the even-numbered gear clutch, or the engine is changed, thereby determining whether the synchronizer and the reverse gear are successfully synchronized.

[0075] In step S202, when it is detected that the synchronizer and the reverse gear are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than a preset number.

[0076] In some optional embodiments, the preset number of times may be 2 times.

[0077] When it is determined that the number of synchronization failures is not greater than the preset number, that is, when the judgment result of step S202 is "No", step S203 is executed to control the synchronizer to separate from the reverse gear first, and move toward the reverse gear again. Then steps S201 and S202 are repeated again to monitor whether the synchronizer and the reverse gear are synchronized successfully. When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than the preset number.

[0078] It can be understood that each time an attempt is made to synchronize the synchronizer with the reverse gear, the friction between the conical surface of the synchronizer and the reverse gear is established, so that the relative position between the synchronizer and the reverse gear can be changed. Therefore, even after the first synchronization failure of the synchronizer with the reverse gear, the relative position between the synchronizer and the reverse gear still changes, and the relative position will change towards synchronization. In this case, the synchronizer can also be controlled to separate from the reverse gear first and move again in the direction close to the reverse gear. Even if the synchronizer and the reverse gear make another synchronization attempt, there is a certain chance that the second attempt will successfully synchronize the synchronizer with the reverse gear.

[0079] When it is determined that the number of synchronization failures is greater than the preset number, that is, when the judgment result of step S202 is "yes", step S204 is executed to control the synchronizer to move in the direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other.

[0080] The preset forward gear position gear and the reverse gear position gear share a synchronizer, and the preset forward gear position gear and the reverse gear position gear are respectively located at two ends of the synchronizer.

[0081] The preset forward gear may be 4th gear.

[0082] It is understandable that after the synchronizer and the reverse gear have failed to synchronize for two times, it indicates that the relative position difference between the synchronizer and the reverse gear may be too large, and due to the special gear ratio of the reverse gear, the shift force required to engage the reverse gear is also relatively large. The synchronizer with a single cone structure can provide a small synchronization torque. Especially in low temperatures and low viscosity of lubricating oil, the synchronization torque provided by the synchronizer may not be sufficient to synchronize the large relative position difference between the synchronizer and the reverse gear, resulting in a stuck phenomenon and inability to engage the reverse gear. Due to the special structure of the dual-clutch transmission, the reverse gear shares a synchronizer with the preset forward gear gear. The preset forward gear gear and the reverse gear are located at both ends of the synchronizer. The preset forward gear can be 2nd, 4th or 6th gear. Since the gear ratio of the 2nd, 4th or 6th gear is different from that of the reverse gear, the shifting force required to engage the 2nd, 4th or 6th gear is smaller than that of the reverse gear. Therefore, when the reverse gear cannot be engaged, the synchronizer is controlled to move away from the reverse gear and closer to the preset forward gear gear, so that the synchronizer and the preset forward gear gear are synchronized with each other. That is, the preset forward gear that shares a synchronizer with the reverse gear is engaged first, so that the synchronizer can rotate and the position of the synchronizer can be adjusted.

[0083] In step S205, the connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0084] It is understandable that, since the reverse gear cannot be engaged, the synchronizer is controlled to move in a direction away from the reverse gear and close to the preset forward gear position, so that the synchronizer is first synchronized with the preset forward gear position, that is, the preset forward gear position that shares a synchronizer with the reverse gear is engaged first, so that the synchronizer rotates and the position of the synchronizer is adjusted. After the synchronizer rotates using the preset forward gear position that shares a synchronizer with the reverse gear and the position of the synchronizer is adjusted, the synchronizer is likely to match the position of the reverse gear, so that the synchronizer and the reverse gear are successfully synchronized with each other.

[0085] It is understandable that if after executing step S205, the synchronizer and the reverse gear are still not synchronized with each other, the operation of first engaging the preset forward gear that shares the same synchronizer with the reverse gear and then trying to engage the reverse gear can be performed again:

[0086] In some optional embodiments, after disconnecting the synchronizer from the preset forward gear and controlling the synchronizer to move toward the reverse gear, the method further includes:

[0087] Monitor whether the synchronizer and reverse gear are synchronized successfully.

[0088] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear gear, so that the synchronizer and the preset forward gear gear are synchronized with each other. The preset forward gear gear and the reverse gear share a synchronizer, and the preset forward gear gear and the reverse gear are respectively located at both ends of the synchronizer.

[0089] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0090] It is understandable that the reverse gear control method of the dual clutch transmission provided in the embodiment of the present application is mainly used to solve the problem that the reverse gear cannot be successfully engaged when the temperature is low and the viscosity of the lubricant is low. If the reverse gear cannot be successfully engaged when the temperature is normal and the viscosity of the lubricant is normal, it means that other problems may occur in the transmission. Therefore, in order to accurately locate the situation of low temperature and low viscosity of the lubricant, in some optional embodiments, the method further includes:

[0091] When receiving the reverse gear shifting command, the synchronizer is controlled to move toward the reverse gear, and the synchronizer and the reverse gear are monitored to see whether they are synchronized successfully.

[0092] When it is monitored that the synchronizer and the reverse gear are not synchronized successfully and the engine oil temperature is lower than the preset temperature, the synchronizer is controlled to move in the direction away from the reverse gear and closer to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other. The preset forward gear and the reverse gear share a synchronizer, and the preset forward gear and the reverse gear are respectively located at the two ends of the synchronizer.

[0093] The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear so that the synchronizer and the reverse gear are synchronized with each other.

[0094] By adopting the reverse gear control method of the dual-clutch transmission provided by the present application, when the reverse gear and a preset forward gear share a synchronizer, when it is monitored that the synchronizer and the reverse gear gear are not synchronized successfully, that is, the reverse gear engagement fails, the synchronizer is controlled to move in the opposite direction, so that the synchronizer is first synchronized with the preset forward gear gear, thereby fine-tuning the position of the synchronizer, and then disconnecting the connection between the synchronizer and the preset forward gear gear, and attempting to synchronize the synchronizer and the reverse gear again. Since the position of the synchronizer is first fine-tuned using the preset forward gear gear corresponding to the reverse gear, the success rate of synchronization between the synchronizer and the reverse gear is increased, and the success rate of engaging the reverse gear is improved.

[0095] The present application also provides a vehicle, such as Figure 3 As shown, the vehicle includes an odd-numbered gear clutch 1, an even-numbered gear clutch 2, a reverse gear 3, a synchronizer 4, and a preset forward gear 5, and the vehicle also includes an engine 6, wheels 7, and a transmission controller, wherein the transmission controller is configured as follows:

[0096] When the reverse gear engaging instruction is received, the synchronizer 4 is controlled to move toward the reverse gear 3 , and it is monitored whether the synchronizer 4 and the reverse gear 3 are synchronized successfully.

[0097] In some optional embodiments, the preset forward gear corresponding to the preset forward gear gear 5 is an even gear.

[0098] Therefore, the clutches corresponding to the preset forward gear and reverse gear are both the even-numbered gear clutch 2, and when the reverse gear engaging instruction is received, the even-numbered gear clutch 2 is engaged. Accordingly, an odd-numbered gear clutch 1 is also provided for engaging the 1st gear, the 3rd gear and the 5th gear.

[0099] Since the current automatic transmission models mostly use a wire control mode for shifting operations, that is, the gear lever and the mechanical structure in the gearbox are not directly connected mechanically, the driver's operation of the gear lever is only used to trigger the gear shift command, rather than directly using the mechanical direct connection to drive the mechanical structure in the gearbox. After the gear shift command is triggered, the gearbox controller will further receive the gear shift command, and then the gearbox controller will control the corresponding mechanical structure in the gearbox to complete the gear shift. Specifically, when the gearbox controller receives the reverse gear shift command, it will control the synchronizer 4 to move in the direction close to the reverse gear 3, and monitor whether the synchronizer 4 and the reverse gear 3 are synchronized successfully. The synchronizer 4 here refers to the synchronizer used for the reverse gear.

[0100] The synchronizer 4 includes a gear sleeve and a cone surface. The transmission controller controls the movement of the synchronizer 4 to control the movement of the gear sleeve of the synchronizer 4 through a shift fork, thereby ultimately achieving engagement or disengagement with a gear of a specific gear position.

[0101] Specifically, a sensor may be used to determine whether the synchronizer 4 and the reverse gear 3 are successfully synchronized. A position sensor may be used to determine whether the synchronizer 4 or the reverse gear 3 rotates, thereby determining whether the synchronizer 4 and the reverse gear 3 are successfully synchronized. A torque sensor may also be used to determine whether the torque of the synchronizer 4, the reverse gear 3, the even-numbered gear clutch 2, or the engine changes, thereby determining whether the synchronizer 4 and the reverse gear 3 are successfully synchronized.

[0102] When it is detected that the synchronizer 4 and the reverse gear 3 are not synchronized successfully, the synchronizer 4 is controlled to move away from the reverse gear 3 and close to the preset forward gear 5, so that the synchronizer 4 and the preset forward gear 5 are synchronized with each other (such as Figure 4 As shown in the figure, the preset forward gear position gear 5 and the reverse gear 3 share a synchronizer 4, and the preset forward gear position gear 5 and the reverse gear 3 are respectively located at two ends of the synchronizer 4.

[0103] Disconnect the connection between the synchronizer 4 and the preset forward gear 5, control the synchronizer 4 to move toward the reverse gear 3, and synchronize the synchronizer 4 with the reverse gear 3 (such as Figure 5 shown).

[0104] In some optional embodiments, the transmission controller is further configured to:

[0105] When it is detected that the synchronizer 4 and the reverse gear 3 are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than a preset number.

[0106] In some optional embodiments, the preset number of times may be 2 times.

[0107] When it is determined that the number of synchronization failures is not greater than the preset number, the synchronizer 4 is controlled to first separate from the reverse gear 3 and then move toward the direction close to the reverse gear 3 again.

[0108] It can be understood that, since each time the synchronizer 4 is attempted to be synchronized with the reverse gear 3, the friction between the conical surface of the synchronizer 4 and the reverse gear 3 is established, the relative position between the synchronizer 4 and the reverse gear 3 can be changed. Therefore, even after the first synchronization failure of the synchronizer 4 and the reverse gear 3, the relative position between the synchronizer 4 and the reverse gear 3 still changes, and the relative position changes towards synchronization. In this case, the synchronizer 4 can also be controlled to separate from the reverse gear 3 first and move again in the direction close to the reverse gear 3. Even if the synchronizer 4 and the reverse gear 3 make another synchronization attempt, there is a certain chance that the second attempt will successfully synchronize the synchronizer 4 and the reverse gear 3.

[0109] When it is determined that the number of synchronization failures is greater than the preset number, the synchronizer 4 is controlled to move in the direction away from the reverse gear 3 and close to the preset forward gear 5, so that the synchronizer 4 and the preset forward gear 5 are synchronized with each other, the connection between the synchronizer 4 and the preset forward gear 5 is disconnected, and the synchronizer 4 is controlled to move in the direction close to the reverse gear 3, so that the synchronizer 4 and the reverse gear 3 are synchronized with each other.

[0110] The preset forward gear may be 4th gear.

[0111] It is understandable that after the synchronizer 4 and the reverse gear 3 have failed in two synchronization attempts, it indicates that the relative position difference between the synchronizer 4 and the reverse gear 3 may be too large, and due to the special gear ratio of the reverse gear 3, the shift force required to engage the reverse gear is also relatively large. The synchronizer 4 with a single cone structure can provide a small synchronization torque. Especially when the temperature is low and the viscosity of the lubricating oil is low, the synchronization torque provided by the synchronizer 4 may not be sufficient to synchronize the large relative position difference between the synchronizer 4 and the reverse gear 3, thereby causing a jamming phenomenon and being unable to engage the reverse gear. Due to the special structure of the dual-clutch transmission, the reverse gear 3 shares a synchronizer 4 with the preset forward gear 5. The preset forward gear 5 and the reverse gear 3 are located at the two ends of the synchronizer 4 respectively. The preset forward gear can be 2nd gear, 4th gear or 6th gear. Since the gear ratio of the 2nd, 4th or 6th gear is different from that of the reverse gear 3, the shifting force required to engage the 2nd, 4th or 6th gear is smaller than that of the reverse gear. Therefore, when the reverse gear cannot be engaged, the synchronizer 4 is controlled to move away from the reverse gear 3 and closer to the preset forward gear gear 5, so that the synchronizer 4 and the preset forward gear gear 5 are synchronized with each other, that is, the preset forward gear that shares the same synchronizer 4 with the reverse gear is engaged first, so that the synchronizer 4 can rotate and the position of the synchronizer 4 can be adjusted.

[0112] Furthermore, by utilizing the preset forward gear gear 5 that shares a preset forward gear with the reverse gear to rotate the synchronizer 4, after adjusting the position of the synchronizer 4, the synchronizer 4 can most likely match the position of the reverse gear 3, so that the synchronizer 4 and the reverse gear 3 are successfully synchronized with each other.

[0113] It can be understood that if the synchronizer 4 is rotated by utilizing the preset forward gear gear 5 of the preset forward gear that shares a synchronizer 4 with the reverse gear, the position of the synchronizer 4 is adjusted, and an attempt is made to synchronize the synchronizer 4 with the reverse gear 3, but the synchronization of the synchronizer 4 with the reverse gear 3 is still not successfully achieved, the operation of first engaging the preset forward gear that shares a synchronizer 4 with the reverse gear and then trying to engage the reverse gear can be re-executed.

[0114] In some optional embodiments, the transmission controller is further configured to:

[0115] After disconnecting the synchronizer 4 from the preset forward gear 5 and controlling the synchronizer 4 to move toward the reverse gear 3 , it is monitored whether the synchronizer 4 and the reverse gear 3 are synchronized successfully.

[0116] When it is monitored that the synchronizer 4 and the reverse gear 3 have not been synchronized successfully, the synchronizer 4 is controlled to move in the direction away from the reverse gear 3 and close to the preset forward gear 5, so that the synchronizer 4 and the preset forward gear 5 are synchronized with each other. The preset forward gear 5 and the reverse gear 3 share a synchronizer 4, and the preset forward gear 5 and the reverse gear 3 are respectively located at the two ends of the synchronizer 4.

[0117] The connection between the synchronizer 4 and the preset forward gear 5 is disconnected, and the synchronizer 4 is controlled to move toward the reverse gear 3 so that the synchronizer 4 and the reverse gear 3 are synchronized with each other.

[0118] In some optional embodiments, the transmission controller is further configured to:

[0119] When the reverse gear engaging instruction is received, the synchronizer 4 is controlled to move toward the reverse gear 3 , and it is monitored whether the synchronizer 4 and the reverse gear 3 are synchronized successfully.

[0120] When it is monitored that the synchronizer 4 and the reverse gear 3 are not synchronized successfully and the oil temperature is lower than the preset temperature, the synchronizer 4 is controlled to move in the direction away from the reverse gear 3 and close to the preset forward gear 5, so that the synchronizer 4 and the preset forward gear 5 are synchronized with each other. The preset forward gear 5 and the reverse gear 3 share a synchronizer 4, and the preset forward gear 5 and the reverse gear 3 are respectively located at the two ends of the synchronizer 4.

[0121] The connection between the synchronizer 4 and the preset forward gear 5 is disconnected, and the synchronizer 4 is controlled to move toward the reverse gear 3 so that the synchronizer 4 and the reverse gear 3 are synchronized with each other.

[0122] With the vehicle provided by the present application, in the case where the reverse gear and a preset forward gear share a synchronizer 4, when it is monitored that the synchronizer 4 and the reverse gear gear 3 are not synchronized successfully, that is, the reverse gear engagement fails, the synchronizer 4 is controlled to move in the opposite direction, so that the synchronizer 4 is first synchronized with the preset forward gear gear 5, thereby fine-tuning the position of the synchronizer 4, and then disconnecting the connection between the synchronizer 4 and the preset forward gear gear 5, and attempting to synchronize the synchronizer 4 with the reverse gear 3 again. Since the position of the synchronizer 4 is fine-tuned by first using the preset forward gear gear 5 corresponding to the reverse gear 3, the success rate of synchronization between the synchronizer 4 and the reverse gear 3 is increased, and the success rate of engaging the reverse gear is improved.

[0123] In the present application, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0124] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0125] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

[0126] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual clutch transmission reverse gear control method, characterized in that: The method comprises: When receiving a reverse gear shifting instruction, controlling the synchronizer to move toward the reverse gear, and monitoring whether the synchronizer and the reverse gear are synchronized successfully; When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in a direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the preset forward gear and the reverse gear share one synchronizer, and the preset forward gear and the reverse gear are respectively located at two ends of the synchronizer; The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

2. The reverse gear control method of a dual clutch transmission according to claim 1, characterized in that: The method further comprises: When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than a preset number; When it is determined that the number of synchronization failures is not greater than the preset number, controlling the synchronizer to first separate from the reverse gear and then move toward the reverse gear again; When it is determined that the number of synchronization failures is greater than the preset number, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move in the direction close to the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

3. The reverse gear control method of a dual clutch transmission according to claim 1, characterized in that: After disconnecting the synchronizer from the preset forward gear and controlling the synchronizer to move toward the reverse gear, the method further includes: monitoring whether the synchronizer and the reverse gear are synchronized successfully; When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in a direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the preset forward gear and the reverse gear share one synchronizer, and the preset forward gear and the reverse gear are respectively located at two ends of the synchronizer; The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

4. The reverse gear control method of a dual clutch transmission according to claim 1, characterized in that: The method further comprises: When receiving a reverse gear shifting instruction, controlling the synchronizer to move toward the reverse gear, and monitoring whether the synchronizer and the reverse gear are synchronized successfully; When it is detected that the synchronizer and the reverse gear are not synchronized successfully and the engine oil temperature is lower than a preset temperature, the synchronizer is controlled to move in a direction away from the reverse gear and close to a preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the preset forward gear and the reverse gear share one synchronizer, and the preset forward gear and the reverse gear are respectively located at two ends of the synchronizer; The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

5. The reverse gear control method of a dual clutch transmission according to claim 1, characterized in that: The preset forward gear corresponding to the preset forward gear gear is an even-numbered gear.

6. A vehicle, characterized in that: The vehicle includes a transmission controller, a synchronizer, a reverse gear, and a preset forward gear, wherein the transmission controller is configured as follows: When receiving a reverse gear shifting instruction, controlling the synchronizer to move toward the reverse gear, and monitoring whether the synchronizer and the reverse gear are synchronized successfully; When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in a direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the preset forward gear and the reverse gear share one synchronizer, and the preset forward gear and the reverse gear are respectively located at two ends of the synchronizer; The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

7. The vehicle according to claim 6, characterized in that The transmission controller is further configured to: When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the number of synchronization failures is accumulated from zero, and it is determined whether the number of synchronization failures is greater than a preset number; When it is determined that the number of synchronization failures is not greater than the preset number, controlling the synchronizer to first separate from the reverse gear and then move toward the reverse gear again; When it is determined that the number of synchronization failures is greater than the preset number, the synchronizer is controlled to move in the direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move in the direction close to the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

8. The vehicle according to claim 6, characterized in that The transmission controller is further configured to: After disconnecting the synchronizer from the preset forward gear and controlling the synchronizer to move toward the reverse gear, monitoring whether the synchronizer and the reverse gear are synchronized successfully; When it is detected that the synchronizer and the reverse gear are not synchronized successfully, the synchronizer is controlled to move in a direction away from the reverse gear and close to the preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the preset forward gear and the reverse gear share one synchronizer, and the preset forward gear and the reverse gear are respectively located at two ends of the synchronizer; The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

9. The vehicle according to claim 6, characterized in that The transmission controller is further configured to: When receiving a reverse gear shifting instruction, controlling the synchronizer to move toward the reverse gear, and monitoring whether the synchronizer and the reverse gear are synchronized successfully; When it is detected that the synchronizer and the reverse gear are not synchronized successfully and the engine oil temperature is lower than a preset temperature, the synchronizer is controlled to move in a direction away from the reverse gear and close to a preset forward gear, so that the synchronizer and the preset forward gear are synchronized with each other, the preset forward gear and the reverse gear share one synchronizer, and the preset forward gear and the reverse gear are respectively located at two ends of the synchronizer; The connection between the synchronizer and the preset forward gear is disconnected, and the synchronizer is controlled to move toward the reverse gear, so that the synchronizer and the reverse gear are synchronized with each other.

10. The vehicle according to claim 6, characterized in that The preset forward gear corresponding to the preset forward gear gear is an even-numbered gear.

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