A synchronizer-free AMT static shift control method and system

Abstract

The present invention discloses a synchronizer-free AMT static shift control method and system, the process is: after receiving a shift request, the clutch target position changes from a disengaged position to an engaged position; the clutch starts to engage, and after the clutch is engaged to the clutch target position, the clutch target position changes from an engaged position to a disengaged position, and the clutch starts to disengage; during the clutch disengagement process, the AMT starts to shift gears and simultaneously performs a tooth alignment detection; if no tooth alignment occurs, the shift is successful; if tooth alignment occurs, the AMT performs a gear disengagement action and simultaneously detects the number of tooth alignments, and corrects the engaged position according to the number of tooth alignments, the clutch target position changes from a disengaged position to a corrected engaged position, and the clutch starts to reengage. The present invention controls the clutch to separate immediately after it is engaged to the engaged position after receiving a shift instruction, and performs a shift action while the clutch is disengaged, which not only avoids a shift shock due to an excessively high rotation speed of the engaging gear sleeve, but also shortens the shift time.

Description

Technical Field

[0001] The present invention belongs to the technical field of synchronizer-free shift control, and in particular relates to a synchronizer-free AMT static shift control method and system. Background Art

[0002] Patent CN112360970B discloses a synchronizer-free static gear-engagement adaptive method, comprising the following steps: S1, when the vehicle is stationary, the engine is idling and static gear-engagement is required, determining whether the vehicle meets the conditions for braking of the intermediate shaft brake; S2, if the conditions for braking of the intermediate shaft brake are met, braking the intermediate shaft brake; if the conditions for braking of the intermediate shaft brake are not met, the speed of the intermediate shaft of the transmission naturally decreases; S3, if the speed of the intermediate shaft reaches within a preset speed threshold, the clutch does not need to be engaged; if the speed of the intermediate shaft is lower than the preset speed threshold, the clutch is engaged until the speed of the intermediate shaft is within the preset speed threshold and the clutch is disengaged; S4, completing the gear-engagement operation.

[0003] Patent CN110925415B discloses an AMT slip-clutch type in-situ gear shifting synchronization control method. After the AMT program is initialized, the relationship curve between the engagement sleeve speed and the TB duty cycle under each gear is recorded and stored. After the gear engagement or shift command is issued, the clutch is controlled to open to the target position to enter the slip-clutch state or semi-clutch state, and the TB duty cycle is controlled to make the engagement ring gear in a low speed state. In the stable low speed state, the gear actuator pushes the engagement sleeve to engage the target engagement ring gear to complete the gear engagement.

[0004] Both of the above patents use the transmission brake to brake while the clutch is in a slipping state, which will cause wear on the clutch and the intermediate shaft brake and affect the service life of the clutch; first controlling the clutch to engage in a slipping state and then applying the transmission brake will cause the static shifting time to be too long, and does not consider the countermeasures after the static shifting fails. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a synchronizer-free AMT static shift control method and system with short shift time and high success rate.

[0006] The technical solution adopted by the present invention is: a synchronizer-free AMT static shift control method, comprising the following steps:

[0007] Step 1, after receiving the shift request, the clutch target position changes from the disengaged position to the engaged position, and step 2 is executed;

[0008] Step 2, the clutch starts to engage. After the clutch engages to the clutch target position, the clutch target position changes from the engaged position to the disengaged position, and the clutch starts to disengage, and step 3 is executed;

[0009] Step 3: During the clutch disengagement process, the AMT starts to shift gears and performs gear alignment detection, and then executes step 4 or step 5;

[0010] Step 4: If no tooth collision occurs, the gear shift is successful;

[0011] Step 5, if gear mismatch occurs, the AMT will disengage the gear and detect the number of gear mismatches at the same time. The engagement position will be corrected according to the number of gear mismatches. The clutch target position will change from the disengaged position to the corrected engaged position, and then return to step 2.

[0012] Furthermore, the process of performing the gear alignment detection is as follows: during the gear shifting process, the moving position of the fork shaft is monitored in real time. If the moving position of the fork shaft within the set time is less than the preset position of the corresponding gear, it is determined that a gear alignment has occurred, and the number of gear alignments is recorded. If the moving position of the fork shaft within the set time is greater than or equal to the preset position of the corresponding gear, it is determined that the gear shift is successful.

[0013] Furthermore, the set time is 20-50ms.

[0014] Furthermore, the shifting action is to control the shift fork shaft to move in reverse phase and return to a neutral state when it is determined that tooth alignment occurs.

[0015] Furthermore, the process of correcting the engagement position according to the number of tooth alignments is as follows: a table is looked up according to the number of tooth alignments to obtain a corrected position, and the corrected engagement position is the previous engagement position minus the corrected position.

[0016] A synchronizer-free AMT static shift control system, comprising:

[0017] The clutch position detection module is used to detect the clutch position in real time and determine whether the clutch position has reached the clutch target position;

[0018] The gear shift detection module is used to detect whether the gear shift is successful in real time;

[0019] A gear-matching judgment module is used to determine the occurrence of gear-matching when the gear shift is detected to be unsuccessful, and record the accumulated number of gear-matching times;

[0020] A clutch position correction module is used to correct the clutch engagement position according to the number of gear matching times;

[0021] The control module is used to adjust the clutch target position from the disengaged position to the engaged position and control the clutch to start engaging when a gear shift request is received; it is used to adjust the clutch target position from the engaged position to the disengaged position and control the clutch to start disengaging after the clutch is engaged to the clutch target position; it is used to control the AMT to execute the gear disengagement action when it is determined that tooth alignment occurs.

[0022] Furthermore, during the gear shifting process, the moving position of the fork shaft is monitored in real time. If the moving position of the fork shaft within the set time is less than the preset position of the corresponding gear, it is determined that tooth matching has occurred and the number of tooth matching times is recorded. If the moving position of the fork shaft within the set time is greater than or equal to the preset position of the corresponding gear, the gear shift is determined to be successful.

[0023] Furthermore, the set time is 20-50ms.

[0024] Furthermore, the process of correcting the clutch engagement position according to the number of gear matching is as follows: a corrected position is obtained by looking up a table according to the number of gear matching, and the corrected engagement position is the previous engagement position minus the corrected position.

[0025] Furthermore, the shifting action is to control the shift fork shaft to move in the opposite phase and return to the neutral state when it is determined that the teeth are aligned.

[0026] The beneficial effects of the present invention are:

[0027] The present invention controls the clutch to engage to the engagement position and then immediately disengages after receiving a shift instruction, and performs the shift action while the clutch is disengaged, thereby avoiding shift shock due to an excessively high rotation speed of the engagement gear sleeve and shortening the shift time.

[0028] After the tooth collision phenomenon occurs, the method of the present invention corrects the target displacement of the clutch engagement according to the number of times the tooth collision occurs, thereby avoiding repeated execution of the gear shifting action under the same conditions in other strategies, reducing the gear shifting noise and improving the success rate of the gear shifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a control flow chart of the present invention. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figure 1As shown, the present invention provides a synchronizer-free AMT (Automatic Mechanical Transmission) static shift control method, comprising the following steps:

[0032] (1) After the vehicle is powered on and the engine is started, the clutch remains in the disengaged state. After the TCU receives the driver's shift request, the clutch target position changes from OpenPoint to KissPoint, and the clutch begins to engage. KissPoint is the clutch engagement position stored by the TCU (when the actual clutch position is stable at this value, it can be detected that the input shaft speed gradually increases from 0). OpenPoint is the disengagement position of the clutch defined by the TCU when it is completely disengaged.

[0033] (2) After the clutch is engaged to the clutch target position (KissPoint), the clutch target position changes from KissPoint to OpenPoint, and the clutch begins to disengage. During the clutch disengagement process, the AMT starts to execute the gear shifting action and perform gear detection. If the gear shift is successful, the gear shifting process ends.

[0034] Take shifting to 1st gear as an example: the shift fork shaft is in neutral at the ±1mm position, and in 1st gear at the (12±0.5)mm position; when executing the shift action, the forward shift solenoid valve is opened to push the shift fork shaft to move in the forward direction, and the shift is successful if the shift fork shaft position is ≥11.5mm; if the shift fork shaft position is <11.5mm within the specified time (for example, 20ms), it is determined that tooth alignment has occurred, and it is recorded as the first occurrence of tooth alignment.

[0035] (3) If tooth collision occurs, the AMT starts to execute the gear disengagement action and records the number of times the tooth collision occurs. The number of times the tooth collision occurs is used as a correction coefficient to correct the engagement position. The clutch target position changes from the disengaged position to the corrected engagement position (i.e., KissPoint-Offset). The clutch is controlled to start engaging. After the clutch is engaged to the clutch target position (KissPoint-Offset), the clutch target position changes to OpenPoint, the clutch starts to disengage, and the AMT re-executes the gear shifting action. If the gear shift is successful, the gear shifting process ends. Otherwise, continue to execute (3) until the gear shift is successful.

[0036] Corrected engagement position = KissPoint - Offset, where Offset is the correction value, which can be obtained by looking up Table 1 based on the number of times the tooth alignment occurs:

[0037] Table 1 Gear matching times-clutch offset correction table

[0038] Gear times 1 2 3 4 5 Offset / mm 0.3 0.7 1 1.2 1.4

[0039] Take shifting to 1st gear as an example: the shift fork shaft is in neutral state at the ±1mm position, and in 1st gear state at the (12±0.5)mm position; when executing the shifting action, open the forward shift solenoid valve, push the shift fork shaft to move forward, and the shifting is successful if the shift fork shaft position is ≥11.5mm; if the shift fork shaft position is <11.5mm within the specified time (for example, 20ms), it is determined that tooth alignment has occurred, and it is recorded as the first occurrence of tooth alignment; at this time, the gear disengagement action starts, the forward shift solenoid valve is closed, the reverse shift solenoid valve is opened, and the pull-in shaft is pushed to move in the reverse direction to return to the neutral state.

[0040] In order to realize the above-mentioned shift control method, the present invention also provides a synchronizer-free AMT static shift control system, comprising:

[0041] The clutch position detection module is used to detect the clutch position in real time and determine whether the clutch position has reached the clutch target position;

[0042] The gear shift detection module is used to detect whether the gear shift is successful in real time;

[0043] A gear-matching judgment module is used to determine the occurrence of gear-matching when the gear shift is detected to be unsuccessful, and record the accumulated number of gear-matching times;

[0044] A clutch position correction module is used to correct the clutch engagement position according to the number of gear matching times;

[0045] The control module is used to adjust the clutch target position from the disengaged position to the engaged position and control the clutch to start engaging when a gear shift request is received; it is used to adjust the clutch target position from the engaged position to the disengaged position and control the clutch to start disengaging after the clutch is engaged to the clutch target position; it is used to control the AMT to execute the gear disengagement action when it is determined that tooth alignment occurs.

[0046] In the above scheme, during the gear shifting process, the moving position of the fork shaft is monitored in real time. If the moving position of the fork shaft within the set time is less than the preset position of the corresponding gear, it is determined that the gear is aligned and the number of gear alignments is recorded. If the moving position of the fork shaft within the set time is greater than or equal to the preset position of the corresponding gear, it is determined that the gear shifting is successful. The set time is 20-50ms.

[0047] In the above scheme, the process of correcting the clutch engagement position according to the number of gear matching is as follows: the corrected position is obtained by looking up a table according to the number of gear matching, and the corrected engagement position is the previous engagement position minus the corrected position.

[0048] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0049] In order to make the description of the present disclosure more detailed and complete, the above description is provided for the implementation and specific embodiments of the present invention; however, this is not the only form of implementing or using the specific embodiments of the present invention. The implementation covers the features of multiple specific embodiments and the method steps and sequences used to construct and operate these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.

[0050] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0051] It should be noted that, although several modules or units of the equipment for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into being embodied by multiple modules or units.

[0052] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the implementation methods of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the implementation methods of the present application.

[0053] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A synchronizer-free AMT static shift control method, characterized in that: The following steps are involved: Step 1, after receiving the shift request, the clutch target position changes from the disengaged position to the engaged position, and step 2 is executed; Step 2, the clutch starts to engage. After the clutch engages to the clutch target position, the clutch target position changes from the engaged position to the disengaged position, and the clutch starts to disengage, and step 3 is executed; Step 3: During the clutch disengagement process, the AMT starts to shift gears and performs gear alignment detection, and then executes step 4 or step 5; Step 4: If no tooth collision occurs, the gear shift is successful; Step 5: If a gear collision occurs, the AMT performs a gear disengagement action and detects the number of gear collisions. The engagement position is corrected according to the number of gear collisions. The clutch target position changes from the disengaged position to the corrected engaged position, and the process returns to step 2. The process of correcting the engagement position according to the number of tooth alignments is as follows: the correction position is obtained by looking up a table according to the number of tooth alignments, and the corrected engagement position is the previous engagement position minus the correction position.

2. The synchronizer-free AMT static shift control method according to claim 1, characterized in that: The process of performing the gear alignment detection is as follows: during the gear shifting process, the moving position of the fork shaft is monitored in real time. If the moving position of the fork shaft within the set time is less than the preset position of the corresponding gear, it is determined that a gear alignment has occurred and the number of gear alignments is recorded. If the moving position of the fork shaft within the set time is greater than or equal to the preset position of the corresponding gear, it is determined that the gear shift is successful.

3. The synchronizer-free AMT static shift control method according to claim 2, characterized in that: The setting time is 20-50ms.

4. The synchronizer-less AMT static shift control method according to claim 1, characterized in that: The shifting action is to control the shift fork shaft to move in the reverse direction and return to the neutral state when it is determined that the teeth are aligned.

5. A synchronizer-free AMT static shift control system, characterized in that: include The clutch position detection module is used to detect the clutch position in real time and determine whether the clutch position has reached the clutch target position; The gear shift detection module is used to detect whether the gear shift is successful in real time; A gear-matching judgment module is used to determine the occurrence of gear-matching when the gear shift is detected to be unsuccessful, and record the accumulated number of gear-matching times; A clutch position correction module is used to correct the clutch engagement position according to the number of gear matching times; The control module is used to adjust the clutch target position from the disengaged position to the engaged position upon receiving a shift request, and control the clutch to start engaging; to adjust the clutch target position from the engaged position to the disengaged position after the clutch is engaged to the clutch target position, and control the clutch to start disengaging; and to control the AMT to execute a gear disengagement action when it is determined that a tooth collision occurs; The process of correcting the clutch engagement position according to the number of gear matching is as follows: the corrected position is obtained by looking up a table according to the number of gear matching, and the corrected engagement position is the previous engagement position minus the corrected position.

6. The synchronizer-less AMT static shift control system according to claim 5, characterized in that: During the gear shifting process, the moving position of the fork shaft is monitored in real time. If the moving position of the fork shaft within the set time is less than the preset position of the corresponding gear, it is judged that tooth matching has occurred and the number of tooth matching times is recorded. If the moving position of the fork shaft within the set time is greater than or equal to the preset position of the corresponding gear, the gear shift is judged to be successful.

7. The synchronizer-less AMT static shift control system according to claim 6, characterized in that: The setting time is 20-50ms.

8. The synchronizer-less AMT static shift control system according to claim 5, characterized in that: The shifting action is to control the shift fork shaft to move in the reverse direction and return to the neutral state when it is determined that the teeth are aligned.

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