Source: https://patents.google.com/patent/WO2014141569A1/en
Timestamp: 2020-08-09 04:08:49
Document Index: 565703790

Matched Legal Cases: ['art 84', 'art 87', 'art 87', 'art 86', 'art 86', 'art 87', 'art 86', 'Application No. 2013']

WO2014141569A1 - Automatic transmission control device - Google Patents
Automatic transmission control device Download PDF
WO2014141569A1
WO2014141569A1 PCT/JP2013/085102 JP2013085102W WO2014141569A1 WO 2014141569 A1 WO2014141569 A1 WO 2014141569A1 JP 2013085102 W JP2013085102 W JP 2013085102W WO 2014141569 A1 WO2014141569 A1 WO 2014141569A1
engagement clutch
PCT/JP2013/085102
月▲崎▼　敦史
日比　利文
2013-03-13 Priority to JP2013-050716 priority Critical
2013-03-13 Priority to JP2013050716 priority
2014-09-18 Publication of WO2014141569A1 publication Critical patent/WO2014141569A1/en
Provided is an automatic transmission control device that can quickly respond to a new shift request for engaging an engageable clutch when the new request is generated during shift control for disengaging the engageable clutch. The automatic transmission control device is provided with: an automatic transmission (3) having an engageable clutch (83) as a gear shifting element, and a shift controller (21) that controls the shifting of the automatic transmission (3), wherein if a down-shift request for engaging the engageable clutch (83) is generated during up-shift control for disengaging the engageable clutch (83) in response to an up-shift request and is generated before completion of the disengagement of the engageable clutch (83) has been determined, down-shift control based on the down-shift request is performed.
The present invention relates to an automatic transmission control device including an automatic transmission having an engagement clutch, and a shift controller that performs shift control of the automatic transmission.
2. Description of the Related Art Conventionally, there is known an automatic transmission control device that includes a stepped automatic transmission having a dog clutch that is fastened at a low speed and a friction clutch that is fastened as a speed change element, and that shifts between the dog clutch and the friction clutch. (For example, refer to Patent Document 1).
By the way, in the conventional automatic transmission control device, during the shift control for releasing the dog clutch, that is, during the shift control from the low speed stage to the high speed stage, the low speed stage in which the dog clutch is engaged due to an increase in the required driving force of the driver, etc. There was a case where a new shift request was generated.
At this time, if the shift control to the high speed stage for releasing the dog clutch is continued and the shift control to the low speed stage for engaging the dog clutch is performed after the shift control is completed, the shift request to the newly generated low speed stage can be quickly responded. The problem of not being able to occur.
The present invention has been made paying attention to the above problems, and is a control device for an automatic transmission that can promptly respond to a new shift request for engaging an engagement clutch generated during shift control for releasing the engagement clutch. The purpose is to provide.
To achieve the above object, a control device for an automatic transmission according to the present invention is provided in a drive system of a vehicle, and includes an automatic transmission having an engagement clutch as a shift element, and a shift controller that performs shift control of the automatic transmission. And.
Then, the shift controller performs a second shift request for engaging the engagement clutch before determining completion of the release of the engagement clutch during the shift control for releasing the engagement clutch according to the first shift request. If there is, the shift control according to the second shift request is executed.
In the present invention, when there is a second shift request for engaging the engagement clutch before determining whether the engagement clutch is released during the shift control for releasing the engagement clutch in response to the first shift request, Shift control by the second shift request is executed by the controller.
That is, if it is before the completion of disengagement of the engagement clutch is determined, the shift control by the first shift request is interrupted, and the second shift request for engaging the engagement clutch is executed. For this reason, the second shift request generated after the first shift request can be satisfied quickly.
As a result, it is possible to promptly respond to a new shift request for engaging the engagement clutch generated during the shift control for releasing the engagement clutch.
1 is an overall system configuration diagram illustrating a drive system configuration and a control system configuration of an electric vehicle (an example of a vehicle) to which a control device according to a first embodiment is applied. FIG. 3 is a control block diagram illustrating a detailed configuration of a shift control system according to the first embodiment. It is explanatory drawing which shows the principal part cross section of the engagement clutch of Example 1. FIG. It is explanatory drawing which shows operation | movement of the engagement clutch of Example 1, and shows the rotation-synchronization initial state of an engagement initial stage. It is explanatory drawing which shows operation | movement of the engagement clutch of Example 1, and shows the middle of rotation synchronization. It is explanatory drawing which shows operation | movement of the engagement clutch of Example 1, and shows the time of completion | finish of rotation synchronization. 3 is a flowchart illustrating a flow of a shift control process executed by the shift controller according to the first embodiment. It is a shift map figure which shows an example of the upshift line and downshift line of an automatic transmission used with the transmission controller of Example 1. In the control device of the first embodiment, even if there is a 2 → 1 shift request during the 1 → 2 shift control, the automatic transmission output rotational speed, the automatic transmission output torque, the motor rotational speed, It is a time chart which shows each characteristic of motor torque, engagement clutch transmission torque, friction clutch transmission torque, engagement clutch sleeve position, and friction clutch slider position. In the control device of the first embodiment, the automatic transmission output rotational speed, the automatic transmission output torque, and the motor rotational speed when the 2 → 1 shift is executed because there is a 2 → 1 shift request during the 1 → 2 shift control. FIG. 5 is a time chart showing characteristics of motor torque, engagement clutch transmission torque, friction clutch transmission torque, engagement clutch sleeve position, and friction clutch slider position. 6 is a flowchart illustrating a flow of a shift control process executed by a shift controller according to a second embodiment. In the control device of the third embodiment, even if there is a 2 → 1 shift request during the 1 → 2 shift control, the automatic transmission output rotational speed, the automatic transmission output torque, the motor rotational speed, It is a time chart which shows each characteristic of motor torque, engagement clutch transmission torque, friction clutch transmission torque, engagement clutch sleeve position, and friction clutch slider position. It is a figure which shows an example of the drive system structure of the hybrid vehicle (other example of a vehicle) which can apply the control apparatus of this invention.
Hereinafter, modes for carrying out the automatic transmission control device of the present invention will be described based on Examples 1 to 3 shown in the drawings.
The configuration of the automatic transmission control device mounted on the electric vehicle (an example of a vehicle) in the first embodiment is divided into “overall system configuration”, “detailed configuration of transmission control system”, and “transmission control processing configuration”. To do.
FIG. 1 shows a drive system configuration and a control system configuration of an electric vehicle to which the control device of the first embodiment is applied. The overall system configuration will be described below with reference to FIG.
As shown in FIG. 1, the drive system configuration of the electric vehicle includes a motor generator MG, an automatic transmission 3, and drive wheels 14.
The motor generator MG is used as a drive motor during power running, and is used as a generator during regeneration, and its motor shaft is connected to the transmission input shaft 6 of the automatic transmission 3.
The automatic transmission 3 is a constantly meshing stepped transmission that transmits power by one of two gear pairs having different gear ratios, and has a high gear stage (high speed stage) with a small reduction ratio and a low gear stage with a large reduction ratio. Two-speed transmission having (low speed) is used. The automatic transmission 3 includes a low-side transmission mechanism 8 that realizes a low gear stage and a high-side transmission mechanism 9 that realizes a high gear stage. Here, the transmission input shaft 6 and the transmission output shaft 7 are arranged in parallel.
The low-side transmission mechanism 8 is for selecting a low-side transmission path, and is disposed on the transmission output shaft 7. The low-side transmission mechanism 8 is engaged and engaged with the transmission output shaft 7 so that the low-speed gear pair 80 (gear 81, gear 82) is drivingly coupled between the transmission input / output shafts 6 and 7. This is constituted by an engagement clutch 83 (meshing clutch) that performs the release. Here, the low-speed gear pair 80 includes a gear 81 rotatably supported on the transmission output shaft 7 and a gear 82 that meshes with the gear 81 and rotates together with the transmission input shaft 6.
The high-side transmission mechanism 9 is for selecting a high-side transmission path and is disposed on the transmission input shaft 6. The high-side speed change mechanism 9 is configured so that the high-speed gear pair 90 (gear 91, gear 92) is frictionally engaged with the transmission input shaft 6 so that the transmission input / output shafts 6 and 7 are coupled to each other. The friction clutch 93 that opens is configured. Here, the high speed gear pair includes a gear 91 rotatably supported on the transmission input shaft 6 and a gear 92 that meshes with the gear 91 and rotates together with the transmission output shaft 7.
The transmission output shaft 7 fixes a gear 11 and drives and couples a differential gear device 13 to the transmission output shaft 7 via a final drive gear set including the gear 11 and a gear 12 meshing with the gear 11. . As a result, the motor power of the motor generator MG reaching the transmission output shaft 7 passes through the final drive gear set (gears 11 and 12) and the differential gear device 13 and the left and right drive wheels 14 (in FIG. 1, one drive wheel is shown). Only shown).
As shown in FIG. 1, the control system configuration of the electric vehicle includes a shift controller 21, a vehicle speed sensor 22, an accelerator opening sensor 23, a brake stroke sensor 24, a longitudinal acceleration sensor 25, a slider position sensor 26, and a sleeve position sensor 27. Etc. In addition to this, a motor controller 28, a brake controller 29, an integrated controller 30, and a CAN communication line 31 are provided.
The shift controller (transmission controller) 21 is configured to release the friction and release the engagement clutch 83 when the up-shift to the high gear stage is performed with the engagement clutch 83 engaged and the friction clutch 93 opened. Replacement control by friction engagement of the clutch 93 is performed.
When the downshift to the low gear stage is performed with the engagement clutch 83 disengaged and the friction clutch 93 selected with the high gear stage for friction engagement, the replacement is performed by engaging the engagement clutch 83 and releasing the friction clutch 93. Carry out control. That is, in the up shift, the engagement clutch 83 that is a mesh clutch serves as a disengagement element, and in the down shift, the engagement clutch 83 that is a mesh clutch serves as a fastening element.
FIG. 2 shows a detailed configuration of the shift control system of the first embodiment. The detailed configuration of the shift control system will be described below with reference to FIG.
As shown in FIG. 2, the shift control system of the electric vehicle control system includes an engagement clutch 83, a friction clutch 93, a motor generator MG, a hydraulic brake 15, a shift controller 21, And an integrated controller 30. That is, the engagement clutch 83 and the friction clutch 93 are configured to perform shift control of upshift / downshift according to a command from the shift controller 21. In addition, the motor generator MG and the hydraulic brake 15 are configured to perform regenerative cooperative brake control according to a command from the integrated controller 30.
The engagement clutch 83 is a clutch by synchro engagement and includes a clutch gear 84 provided on the gear 81, a clutch hub 85 coupled to the transmission output shaft 7, and a coupling sleeve 86 ( (See FIG. 1). Then, the coupling sleeve 86 is stroke driven by the first electric actuator 41 shown in FIG. 2 to engage / disengage the engagement. The coupling sleeve 86 including the first electric actuator 41 corresponds to the “engagement clutch actuator” recited in the claims.
Engagement engagement and release of the engagement clutch 83 are determined by the position of the coupling sleeve 86. Therefore, the shift controller 21 reads the value of the sleeve position sensor 27, and supplies a current to the first electric actuator 41 so that the sleeve position becomes the fastening position or the open position, for example, a position by PID control. Servo system).
When the coupling sleeve 86 is in the meshing position (engagement position) shown in FIG. 1 meshed with both the clutch gear 84 and the outer peripheral clutch teeth of the clutch hub 85, the gear 81 is drivingly connected to the transmission output shaft 7. . On the other hand, when the coupling sleeve 86 is displaced in the axial direction from the position shown in FIG. 1, the gear 81 is shifted when it is in the non-engagement position (open position) with one of the clutch gear 84 and the outer peripheral clutch teeth of the clutch hub 85. Disconnect from the machine output shaft 7.
Further, the synchronization mechanism of the engagement clutch 83 will be described based on FIGS. 3A to 3D.
The coupling sleeve 86 is supported so as to be movable in the axial direction which is the left-right direction in FIG. 3A while maintaining a state where it is engaged with a spline portion (not shown) formed on the outer periphery of the clutch hub 85 (see FIG. 1). Has been. Then, the axial movement of the coupling sleeve 86 is performed by driving the first electric actuator 41 (see FIG. 2).
The clutch gear 84 has a spline portion 84a that can mesh with a spline portion 86a formed on the inner periphery of the coupling sleeve 86 on the outer periphery. Further, a synchronizer ring 87 is attached to the clutch gear 84 on the outer periphery of the tapered cone portion 84b so as to be movable in the axial direction.
The synchronizer ring 87 has a spline portion 87a that can mesh with the spline portion 86a of the coupling sleeve 86 on the outer periphery. Further, the synchronizer ring 87 is configured to be relatively movable in the rotational direction with respect to the key 88 provided on the coupling sleeve 86 by a gap formed by the key groove 87c (see FIG. 3B and the like).
Next, the synchronization operation by the synchronization mechanism when the engagement clutch 83 is engaged and fastened from the released state will be described.
When the engagement clutch 83 is engaged and fastened from the released state, the synchronizer ring 87 is axially pressed by the coupling sleeve 86 so as to be close to the clutch gear 84. Thereby, a frictional force is generated between the synchronizer ring 87 and the cone portion 84b, and the coupling sleeve 86 and the clutch gear 84 are synchronously rotated and engaged and fastened by this frictional force.
That is, the coupling sleeve 86 is moved in the axial direction in the direction close to the clutch gear 84 together with the key 88 by the first electric actuator 41 (see FIG. 2) as shown in FIG. It is made to contact the cone part 84b.
When the synchronizer ring 87 comes into contact with the cone portion 84b, relative rotation occurs between the two, so that the synchronizer ring 87 rotates by the gap of the key groove 87c shown in FIG. 3B. Thereby, the chamfer part 87b of the spline part 87a of the synchronizer ring 87 and the chamfer part 86b of the spline part 86a of the coupling sleeve 86 are in the index state facing each other in the axial direction as shown in FIG. 3B.
When the coupling sleeve 86 is further moved to the clutch gear 84 side from this index state, both chamfer portions 87b and 86b come into contact as shown in FIG. 3C. As a result, the synchronizer ring 87 further pushes the cone portion 84b to generate a friction torque, and the synchronizer ring 87, the coupling sleeve 86, and the clutch gear 84 are synchronized.
When this rotation synchronization is established, the friction torque between the synchronizer ring 87 and the cone portion 84b disappears, and the coupling sleeve 86 further moves in the axial direction. As a result, the spline portion 86a of the coupling sleeve 86 pushes the synchronizer ring 87 and engages with the spline portion 84a of the clutch gear 84, as shown in FIG. 3D, and the engagement clutch 83 is in an engaged and engaged state.
As described above, the friction is provided between the gear 81 and the clutch hub 85 and is generated as the coupling sleeve 86 is moved in the axial direction, and is generated as the engagement side of the engagement clutch 83 is moved relative to the output side. The input side and output side are rotated synchronously by force. That is, the clutch gear 84, the coupling sleeve 86, and the synchronizer ring 87 constitute a synchronization mechanism.
When the engagement clutch 83 is released from the engaged engagement state, the coupling sleeve 86 is axially moved away from the clutch gear 84 together with the key 88 by the first electric actuator 41 (see FIG. 2). Move. At this time, the spline portion 86 a of the coupling sleeve 86 is pulled out from the spline portion 87 a of the synchronizer ring 87.
When the spline portion 86a is pulled out from the spline portion 87a of the synchronizer ring 87, the synchronization state with the clutch gear 84, the synchronizer ring 87, and the coupling sleeve 86 is canceled. At the same time, the synchronizer ring 87 rotates, and the chamfer part 87b and the chamfer part 86b of the coupling sleeve 86 come into contact with each other.
Further, when the coupling sleeve 86 is further moved away from the clutch gear 84, the contact between the chamfer portions 87b and 86b is eliminated. As a result, the spline portion 86a of the coupling sleeve 86 is completely separated from the synchronizer ring 87, and the engagement clutch 83 is released.
The friction clutch 93 includes a driven plate 94 that rotates together with the gear 91 and a drive plate 95 that rotates together with the transmission input shaft 6 (see FIG. 1). Then, the second electric actuator 42 drives the slider 96 that applies a pressing force to the plates 94 and 95, thereby engaging / releasing the friction.
The transmission torque capacity of the friction clutch 93 is determined by the position of the slider 96. The slider 96 is a screw mechanism, and a mechanism for holding the position when the input of the second electric actuator 42 is 0 (zero). It has become. The speed change controller 21 reads the value of the slider position sensor 26 and supplies a current to the second electric actuator 42 so as to obtain a slider position where a desired transmission torque capacity can be obtained (for example, a position by PID control). Servo system).
The friction clutch 93 rotates integrally with the transmission input shaft 6 to drive-couple the gear 91 to the transmission input shaft 6 when frictionally engaged, and when disengaged, the gear 91 and the transmission input shaft 6 drive connection is disconnected.
The motor generator MG is subjected to power running control or regenerative control by a motor controller 28 that receives a command output from the integrated controller 30. That is, when the motor controller 28 inputs a motor torque command, the motor generator MG is controlled in power running. When motor controller 28 inputs a regenerative torque command, motor generator MG is regeneratively controlled.
The hydraulic brake 15 applies a hydraulic braking force to the drive wheel 14 by the brake fluid supplied via the brake pedal 16 → the electric booster 17 → the master cylinder 18 → the brake hydraulic actuator 19. When the brake controller 29 inputs a brake hydraulic pressure command during regenerative cooperative brake control, the hydraulic brake 15 controls the brake hydraulic pressure by outputting a drive command corresponding to the sharing of the hydraulic braking force to the electric booster 17. The Here, the regenerative cooperative brake control is to achieve the required braking force (or the required deceleration) calculated based on the brake stroke amount BST from the brake stroke sensor 24 by sharing the regenerative braking force and the hydraulic braking force. Refers to control. Basically, in order to improve the power consumption performance, the regenerative braking force is determined based on the maximum regenerative torque possible at that time, and the remainder obtained by subtracting the regenerative braking force from the required braking force is shared by the hydraulic braking force.
The shift controller 21 receives information from the vehicle speed sensor 22, the accelerator opening sensor 23, the brake stroke sensor 24, the longitudinal acceleration sensor 25, and the like, and controls the shift of the automatic transmission 3 using, for example, a shift map shown in FIG. (Upshift, downshift) is executed.
[Shift control processing configuration]
FIG. 4 shows a flow of a shift control process executed by the shift controller according to the first embodiment. Hereinafter, each step representing the shift control processing configuration will be described with reference to FIG.
In step S1, whether an up shift request (first shift request) to the high gear stage for releasing the engagement clutch 83 has occurred in a state where the low gear stage to which the engagement clutch 83 is engaged is selected. Judge whether or not. If YES (there is an upshift request), the process proceeds to step S2, and if NO (no upshift request is requested), step S1 is repeated.
Here, the upshift request is made when the operating point determined by the vehicle speed VSP and the required motor torque crosses the upshift line due to, for example, an increase in the vehicle speed VSP in the shift map (FIG. 5) used in the shift controller 21. appear.
The vehicle speed VSP is detected by the vehicle speed sensor 22. The required motor torque is calculated based on the accelerator opening APO detected by the accelerator opening sensor 23 or the brake stroke amount BST detected by the brake stroke sensor 24.
In step S2, following the determination that there is an upshift request in step S1, execution of upshift control is started, and the process proceeds to step S3.
By this upshift control, the changeover control is started in which the engagement clutch 83 is changed from engagement to release and the friction clutch 93 is changed from release to engagement.
In step S3, following the determination that the upshift control is started in step S2, it is determined whether or not a downshift request (second shift request) to the low gear stage for engaging and engaging the engagement clutch 83 has occurred. To do. If YES (downshift request is present), the process proceeds to step S4. If NO (downshift request is not requested), the process proceeds to step S5.
Here, the downshift request is generated when the operating point determined by the vehicle speed and the required motor torque crosses the downshift line due to, for example, the driver's accelerator depression in the shift map (FIG. 5) used in the shift controller 21.
In step S4, following the determination that there is a downshift request in step S3, it is determined whether or not the stroke position of the coupling sleeve 86 of the engagement clutch 83 when the downshift request has occurred exceeds a preset threshold position. To do. If YES (stroke position> threshold position), the process proceeds to step S5. If NO (stroke position ≦ threshold position), the process proceeds to step S6.
Here, the “threshold position” is a position at which it is possible to determine the completion of disengagement of the engagement clutch 83. Specifically, when the coupling sleeve 86 is pulled out from the synchronizer ring 87, the chamfer portion 86b of the coupling sleeve 86 is obtained. And the chamfer portion 87b of the synchronizer ring 87 is in a contacted state. Here, the state in which both chamfer portions 86b and 87b are in full contact is defined as the threshold position. The stroke position of the coupling sleeve 86 is detected by the sleeve position sensor 27.
In step S5, following the determination that there is no downshift request in step S3, or the determination that the stroke position> the threshold position in step S4, it is determined that the disengagement control of the engagement clutch 83 has been completed, and the output determination is made in step S3 The up-shift control started in step S2 is continued and ignored, and the up-shift control is terminated and the process proceeds to the end.
When the upshift control is completed, if it can be determined from the position of the operating point on the shift map that the downshift request is generated, the downshift control is immediately executed.
In step S6, following the determination that stroke position ≦ threshold position in step S4, assuming that the disengagement control of the engagement clutch 83 has not been completed, the upshift control started in step S2 is interrupted, and a new shift request is made. Downshift control based on a certain downshift request is executed. Then, the downshift control is terminated and the process proceeds to the end.
The operations of the control device for the automatic transmission according to the first embodiment are as follows: “normal shift control operation”, “up shift continuing operation when a down shift request is generated during an up shift”, and “down shift request when an up shift is generated The description will be divided into “downshift execution operation”.
[Normal shift control action]
The shift controller 21 inputs the vehicle speed from the vehicle speed sensor 22, the accelerator opening APO from the accelerator opening sensor 23, and the brake stroke amount BST from the brake stroke sensor 24. Based on the input information and the shift map illustrated in FIG. 5, the shift control of the automatic transmission 3 is performed as described below.
In the shift map of FIG. 5, the thick solid line connects the maximum motor driving torque line obtained by connecting the maximum motor driving torque value of the motor generator MG for each vehicle speed and the maximum motor regenerating torque value of the motor generator MG for each vehicle speed. The maximum motor regenerative torque line obtained is shown, and the area surrounded by these is the practical area.
Within this practical range, in consideration of the transmission loss of the automatic transmission 3 and the motor loss of the motor generator MG, an upshift line indicated by a one-dot chain line (Low → High) and a downshift line indicated by a broken line (High → Low ) Is set. The upshift line (Low → High) is set on the higher vehicle speed side by the hysteresis than the downshift line (High → Low).
In the shift controller 21, when driving with the accelerator pedal depressed, the operating point is determined based on the required motor driving torque, which is the required motor torque obtained from the accelerator opening APO, and the vehicle speed VSP. On the other hand, at the time of braking when the brake pedal is depressed, the operating point is determined based on the required motor regeneration torque, which is the required motor torque obtained from the brake stroke amount BST, and the vehicle speed VSP. When the operating point is determined, it is suitable for the current operating state depending on whether the operating point is in the low-side gear region or the operating point is in the high-side gear region on the shift map of FIG. The target gear stage (low gear stage or high gear stage) is obtained.
Next, if the obtained target shift speed is the low gear speed, the engagement clutch 83 is brought into the engaged engagement state, and the low gear speed selection state in which the friction clutch 93 is released is brought into the selected state. If the obtained target shift speed is the high gear speed, the friction clutch 93 is set to the friction engagement state and the engagement gear 83 is set to the disengagement state.
Furthermore, when the low gear stage is selected, when the operating point in the practical range crosses the upshift line (Low → High) and enters the High side gear stage area, the target gear stage is switched to the high gear stage. On the other hand, when the high gear stage is selected, the target shift stage is switched to the low gear stage when the operating point in the practical range crosses the downshift line (High → Low) and enters the low gear stage.
Then, an upshift request or a downshift request is output by switching the target shift stage, and a shift control (upshift control or downshift control) based on the shift request is executed.
In the normal shift control, the upshift control in which the automatic transmission 3 is shifted from the low gear stage to the high gear stage is a reshuffling shift in which the engagement clutch 83 in the engagement engagement state is released and the friction clutch 93 in the release state is frictionally engaged. Is done. On the other hand, the downshift control for shifting the automatic transmission 3 from the high gear stage to the low gear stage is performed by a changeover shift in which the engagement clutch 83 in the released state is engaged and engaged, and the friction clutch 93 in the frictionally engaged state is opened. .
[Upshift continuation action when a downshift request occurs during an upshift]
FIG. 6 shows the automatic transmission output rotational speed, the automatic transmission output torque, and the automatic transmission output torque when the 1 → 2 shift is continued even if there is a 2 → 1 shift request during the 1 → 2 shift control. It is a time chart which shows each characteristic of motor rotation speed, motor torque, engagement clutch transmission torque, friction clutch transmission torque, engagement clutch sleeve position, and friction clutch slider position. Hereinafter, based on FIG. 6, the upshift continuation action when a downshift request is generated during an upshift will be described.
At time t1 in the time chart shown in FIG. 6, while driving in the low gear stage selected state, the operating point in the usable area crosses the upshift line (Low → High) and enters the High side gear stage area. An upshift request (first shift request) is output.
Accordingly, the process proceeds from step S1 to step S2 in the flowchart shown in FIG. 4, and the execution of the upshift control is started. First, the slider 96 of the friction clutch 93, which is the engagement side element, is driven by the second electric actuator 42. The slider 96 is clogged. That is, the slider 96 gradually moves from the open position to the fastening position.
At time t2, when the slider 96 is completely rattled, the transmission torque of the friction clutch 93 starts to increase, and the motor generator MG is torque-controlled to increase the motor torque that is the input torque to the automatic transmission 3. Here, the transmission torque of the engagement clutch 83 that is the disengagement side element is a difference between the input torque (motor torque) to the automatic transmission 3 and the transmission torque of the friction clutch 93, and therefore gradually decreases.
Then, at time t3 while the transmission torque of the friction clutch 93 is increasing, a release command for releasing the engagement clutch 83 is output. The release command is output from the speed change controller 21 to the first electric actuator 41 via the first position servo controller 51. Further, the release command is a time for the coupling sleeve 86 of the engagement clutch 83 to reach the release position in accordance with the timing at which the input torque (motor torque) to the automatic transmission 3 and the transmission torque of the friction clutch 93 coincide. It is obtained by calculating backward from (time t6).
At time t4, the coupling sleeve 86 of the engagement clutch 83 starts moving from the engagement position toward the release position. At time t5, the coupling sleeve 86 is in a threshold position where it can be determined that the engagement clutch 83 has been released, that is, the chamfer portion 86b of the coupling sleeve 86 and the chamfer portion 87b of the synchronizer ring 87 are in full contact. Reaching the state. Thereby, it is determined that the engagement clutch 83 has been released.
After that, at time tα, when the operating point crosses the downshift line (High → Low) and enters the Low gear region, the downshift request (second shift request) is output. However, at the time tα, it is already determined that the engagement clutch 83 has been released (time t5). Therefore, in the flowchart of FIG. 4, the process proceeds from step S3 to step S4 to step S5, and the upshift control is continued.
That is, the release operation of the engagement clutch 83 continues, and at time t6, the coupling sleeve 86 reaches the release position, and the engagement clutch 83 is completely released. Thereby, the motor torque and the friction clutch transmission torque coincide with each other, and the engagement clutch transmission torque becomes zero. Then, the rotational speed control of motor generator MG is started. At this time, the slider 96 of the friction clutch 93 stops at a position where the friction clutch 93 maintains the slip engagement state.
When the motor rotational speed matches the target rotational speed after the upshift at time t7, the slider 96 of the friction clutch 93 is driven in the engagement direction. When the friction clutch 93 is fully engaged at time t8, the upshift control is terminated and the high gear stage is reached. Will be selected.
As described above, in the control device according to the first embodiment, during the shift control for releasing the engagement clutch 83 in response to the upshift request, the downshift that causes the engagement clutch 83 to be engaged is determined after the completion of the release of the engagement clutch 83 is determined. If there is a request, the upshift control by the upshift request is continued.
Therefore, during the upshift control, the engagement clutch 83 is prevented from being engaged from the state in which the release completion is determined, and an unreasonable torque acts on the coupling sleeve 86 and the synchronizer ring 87. Can be prevented. Thereby, wear of the engagement clutch 83 can be reduced and durability can be prevented from being impaired.
[Operation for executing downshift when a downshift request occurs during upshift]
FIG. 7 shows the automatic transmission output rotation speed / automatic transmission output torque when the 2 → 1 shift is executed in response to the 2 → 1 shift request during the 1 → 2 shift control in the control device of the first embodiment. It is a time chart showing characteristics of motor rotation speed, motor torque, engagement clutch transmission torque, friction clutch transmission torque, engagement clutch sleeve position, and friction clutch slider position. Hereinafter, based on FIG. 7, the downshift execution operation when the downshift request is generated during the upshift will be described.
At time t11 in the time chart shown in FIG. 7, during traveling in the low gear stage selected state, the operating point in the usable area crosses the upshift line (Low → High) and enters the High side gear stage area. An upshift request (first shift request) is output.
At time t12, when the slider 96 is completely rattled, the transmission torque of the friction clutch 93 starts to increase, and the motor generator MG is torque-controlled to increase the motor torque that is the input torque to the automatic transmission 3. Here, the transmission torque of the engagement clutch 83 that is the disengagement side element is a difference between the input torque (motor torque) to the automatic transmission 3 and the transmission torque of the friction clutch 93, and therefore gradually decreases.
Then, at time t13 while the transmission torque of the friction clutch 93 is increasing, a release command for releasing the engagement clutch 83 is output, and at time t14, the coupling sleeve 86 of the engagement clutch 83 is moved from the engagement position. Start moving towards the open position. After that, at time tβ, the operating point crosses the downshift line (High → Low) and enters the Low shift region, so that a downshift request (second shift request) is output.
Here, the time tβ at which the downshift request is output is before the position of the coupling sleeve 86 reaches the threshold position for determining the completion of disengagement of the engagement clutch 83. Therefore, in the flowchart of FIG. The process proceeds from S4 to step S6. Thereby, the upshift control is interrupted and the downshift control is executed. That is, the automatic transmission 3 returns to the low gear stage selection state.
Thereby, immediately after the output of the downshift request, an engagement command for engaging the engagement clutch 83 is output, and at time t15, the coupling sleeve 86 of the engagement clutch 83 moves from the current position toward the engagement position. Start. Thereafter, the coupling clutch 86 reaches the engagement position at the time t16, and the engagement clutch 83 is again fully engaged.
On the other hand, the slider 96 of the friction clutch 93 starts to move toward the release position from the time tβ when the downshift request is output, and the transmission torque of the friction clutch 93 starts to decrease. Motor generator MG is torque-controlled to reduce motor torque that is input torque to automatic transmission 3. Note that the transmission torque of the engagement clutch 83 is a difference between the input torque (motor torque) to the automatic transmission 3 and the transmission torque of the friction clutch 93, and thus gradually increases.
At time t17, when the slider 96 of the friction clutch 93 reaches the disengaged position, the friction clutch transmission torque becomes zero, and the motor torque matches the transmission torque of the engagement clutch 83. As a result, the downshift control is completed and the low gear stage is selected.
As described above, in the control device of the first embodiment, during the shift control for releasing the engagement clutch 83 due to the upshift request, the downshift for engaging the engagement clutch 83 before determining the completion of the release of the engagement clutch 83 is determined. When there is a shift request, the upshift control is stopped and the downshift control based on the downshift request is executed.
Therefore, even during the upshift control, the engagement clutch 83 is not released, and the low gear stage can be immediately returned to the selected state. As a result, for example, a downshift request generated by a driver request can be satisfied quickly, and a newly generated shift request can be answered promptly. Further, the engagement clutch 83 does not complete the disengagement, and the state where the engagement can be determined is maintained. Thereby, it is possible to prevent an excessive torque from acting on the engagement clutch 83, reduce wear of the engagement clutch 83, and prevent the durability from being impaired.
Moreover, in the control device of the first embodiment, the coupling sleeve 86 has a threshold position at which it is possible to determine the completion of disengagement of the engagement clutch 83, that is, the chamfer portion 86b of the coupling sleeve 86 and the chamfer portion 87b of the synchronizer ring 87. When the contact state is reached, it is determined that the engagement clutch 83 has been released.
That is, in the first embodiment, completion of disengagement of the engagement clutch 83 is determined when the position of the coupling sleeve 86 exceeds a preset threshold position.
Therefore, even when the pressing force of the first electric actuator 41 that moves the coupling sleeve 86 is unknown, it is possible to accurately determine whether the engagement clutch 83 has been released.
In the automatic transmission control apparatus according to the first embodiment, the following effects can be obtained.
(1) An automatic transmission control device that is provided in a drive system of a vehicle and includes an automatic transmission 3 having an engagement clutch 83 as a transmission element, and a shift controller 21 that performs shift control of the automatic transmission 3. In
The shift controller 21 determines the completion of disengagement of the engagement clutch 83 during the shift control (up shift control) for releasing the engagement clutch 83 according to the first shift request (up shift request). When there is a second shift request (down shift request) for engaging the engagement clutch 83,
The shift control (down shift control) according to the second shift request (down shift request) is executed.
Thereby, it is possible to promptly respond to a new shift request (down shift request) generated during the shift control (up shift control) for releasing the engagement clutch 83. Further, after the release of the engagement clutch 83 is completed, it is possible to prevent the torque from acting on the engagement clutch 83 and reduce the wear.
(2) The engagement clutch 83 is controlled to be engaged / released by stroking the engagement clutch actuator (coupling sleeve 86).
The shift controller 21 determines completion of disengagement of the engagement clutch 83 when the stroke position of the engagement clutch actuator (coupling sleeve 86) exceeds a preset threshold (threshold position). .
Thereby, in addition to the effect of (1), even if the pressing force of the first electric actuator 41 that moves the coupling sleeve 86 is unknown, it is possible to accurately determine whether the engagement clutch 83 has been released.
The second embodiment is an example in which the determination of the completion of disengagement of the engagement clutch is configured differently from the first embodiment.
FIG. 8 is a flowchart showing the flow of a shift control process executed by the shift controller according to the second embodiment. Hereinafter, based on FIG. 8, the control apparatus of the automatic transmission of Example 2 is demonstrated. In addition, about the step equivalent to Example 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
If it is determined in step S3 shown in FIG. 8 that there is a downshift request, the process proceeds to step S24. In step S24, following the determination that there is a downshift request in step S3, it is determined whether or not the differential rotational speed in the engagement clutch 83 when the downshift request is generated exceeds a preset threshold rotational speed. If YES (differential rotational speed> threshold differential rotational speed), the process proceeds to step S5. If NO (differential rotational speed ≦ threshold differential rotational speed), the process proceeds to step S6.
Here, the “threshold difference rotational speed” is a differential rotational speed at which the completion of disengagement of the engagement clutch 83 can be determined. Specifically, when the coupling sleeve 86 is pulled out from the synchronizer ring 87, the coupling sleeve 86 is extracted. The number of times that the relative rotation of the synchronizer ring 87 is recognized is defined as the threshold difference rotational speed. The differential rotational speed of the engagement clutch 83 is obtained from the difference between the motor rotational speed that is the input rotational speed of the automatic transmission 3 and the automatic transmission output rotational speed.
As described above, the completion of disengagement of the engagement clutch 83 is determined based on the differential rotation speed in the engagement clutch 83 when the differential rotation speed exceeds a preset threshold differential rotation speed. The sleeve position sensor 27 for detecting the position of the coupling sleeve 86 can be dispensed with.
In the automatic transmission control device according to the second embodiment, the following effects can be obtained.
(3) The shift controller 21 determines the completion of disengagement of the engagement clutch 83 when the differential rotation speed in the engagement clutch 83 exceeds a preset threshold value (threshold differential rotation speed).
Thereby, in addition to the effect of (1), the sleeve position sensor 27 for detecting the position of the coupling sleeve 86 of the engagement clutch 83 can be made unnecessary.
The third embodiment is an example in which the friction clutch transmission torque when the upshift control is continued even when there is a downshift request is configured differently from the first embodiment.
FIG. 9 shows the automatic transmission output rotational speed, the automatic transmission output torque, and the automatic transmission output torque when the 1 → 2 shift is continued even if there is a 2 → 1 shift request during the 1 → 2 shift control in the control device of the third embodiment. It is a time chart which shows each characteristic of motor rotation speed, motor torque, engagement clutch transmission torque, friction clutch transmission torque, engagement clutch sleeve position, and friction clutch slider position. Hereinafter, based on FIG. 9, the control apparatus of the automatic transmission of Example 3 is demonstrated.
In the control device of the third embodiment, as shown in FIG. 9, during the shift control for releasing the engagement clutch 83 in response to the upshift request, after determining that the engagement clutch 83 has been released, the engagement clutch 83 is engaged. Even if there is a downshift request to be made, the upshift control by the upshift request is continued. Moreover, the friction clutch transmission torque after the down shift request is made is made larger than the friction clutch transmission torque when the down shift request is not made.
That is, when an upshift request (first shift request) is output at time t31 in the time chart shown in FIG. 9, execution of upshift control is started. First, the slider of the friction clutch 93, which is the engagement side element, is started. 96 is driven by the second electric actuator 42, and the slider 96 is clogged.
At the time t32, when the slider 96 is completely clogged, the transmission torque of the friction clutch 93 starts to increase and the motor generator MG is torque-controlled to increase the motor torque that is the input torque to the automatic transmission 3. Further, the transmission torque of the engagement clutch 83 that is the disengagement side element gradually decreases.
Then, at time t33 while the transmission torque of the friction clutch 93 is increasing, a release command for releasing the engagement clutch 83 is output, and at time t34, the coupling sleeve 86 of the engagement clutch 83 is moved from the engagement position. Start moving towards the open position. At time t35, when the coupling sleeve 86 reaches a threshold position where it can be determined that the engagement clutch 83 has been released, it is determined that the engagement clutch 83 has been released.
After that, even when the downshift request (second shift request) is output at time tα, the completion of disengagement of the engagement clutch 83 has already been determined at the time tα, so the upshift control is continued. .
Then, the releasing operation of the engagement clutch 83 continues, and at time t36, the coupling sleeve 86 reaches the release position, and the engagement clutch 83 is completely released. Thereby, the motor torque and the friction clutch transmission torque coincide with each other, and the engagement clutch transmission torque becomes zero. Then, the rotational speed control of motor generator MG is started. At this time, the slider 96 of the friction clutch 93 stops at a position where the friction clutch 93 maintains the slip engagement state, as in the first embodiment, for example, when the downshift request is not output during the shift (see FIG. 6).
On the other hand, in Example 3, the slider 96 of the friction clutch 93 does not stop at the position where the friction clutch 93 maintains the slip engagement state, but continues to move to the position where the friction clutch 93 becomes the complete engagement state. That is, the friction clutch transmission torque continues to increase after time t36, and becomes larger than when the downshift request is not output during the shift.
At time t37, when the friction clutch 93 is completely engaged, the friction clutch transmission torque matches the motor torque, the upshift control is terminated, and the high gear stage is selected.
Thus, by increasing the friction clutch transmission torque compared to when the downshift request is not output, the time from when the engagement clutch 83 is released until the friction clutch 93 is engaged (from time t36 to time t37). Is the engagement clutch when the friction clutch 93 is fully engaged after maintaining the friction clutch transmission torque so that the friction clutch 93 stops at the position where the slip engagement state is maintained, as in the first embodiment, for example. It becomes shorter than the time from opening 83 to fastening the friction clutch 93 (time from time t6 to time t8; see FIG. 6). As a result, the time from when the upshift request is output until the upshift control is completed can be shortened compared to when the downshift request is not issued during the shift control.
If a downshift request is output during upshift control, the downshift request output is predicted immediately after the upshift control. Therefore, it is necessary to finish the upshift control in a short time and prepare for the next shift request. Therefore, it is advantageous for controlling the operation of the automatic transmission 3 after the upshift control is completed by increasing the friction clutch transmission torque larger than when the downshift request is not output, thereby ending the upshift control in a short time. become.
In the automatic transmission control device according to the third embodiment, the following effects can be obtained.
(4) The automatic transmission 3 includes the engagement clutch 83, and a friction clutch 93 that is replaced with the engagement clutch 83, and 93.
The speed change controller 21 of the friction clutch 93 when the speed change control (up speed change control) is continued by the first speed change request (up speed change request) even when the second speed change request (down speed change request) is present. The transmission torque is greater than the transmission torque of the friction clutch 93 during the shift control (up shift control) by the first shift request (up shift request) when there is no second shift request (down shift request). It was set as the structure enlarged.
As a result, in addition to any of the effects (1) to (3), the upshift control can be completed in a short time, and the operation control of the automatic transmission 3 after the upshift control is completed can be advantageous. it can.
The control device for the automatic transmission according to the present invention has been described based on the first to third embodiments. However, the specific configuration is not limited to these embodiments, and each claim in the claims is described. Design changes and additions are permitted without departing from the spirit of the invention according to the paragraph.
In each of the above-described embodiments, an example of a transmission having an engagement clutch 83 and a friction clutch 93 as an automatic transmission and a two-speed gear stage of a high gear stage and a low gear stage is shown. However, the automatic transmission may be an automatic transmission having an engagement clutch, and may be a transmission having only an engagement clutch as a transmission element, or a transmission having two or more speed stages. May be.
In the first embodiment, when the release of the engagement clutch 83 is completed, when the coupling sleeve 86 is pulled out from the synchronizer ring 87, the chamfer portion 86b of the coupling sleeve 86 and the chamfer portion 87b of the synchronizer ring 87 are entirely exposed. An example of judging when the contact state is exceeded was shown. However, the present invention is not limited to this. For example, when the coupling sleeve 86 is pulled out from the synchronizer ring 87, if both the chamfer portions 86b and 87b are in contact with each other, it may be determined that the engagement clutch 83 has been released. Good. The sleeve position that is a criterion for determining the completion of opening can be set arbitrarily.
In each of the above embodiments, an example in which the control device for an automatic transmission according to the present invention is applied to an electric vehicle having a motor generator MG as a drive source has been described. However, the control device of the present invention can also be applied to a hybrid vehicle having a drive source including an engine and a motor generator. For example, as a hybrid vehicle having an engine and two motor generators as a drive source, as shown in FIG. 10, an engine 1, a power generation motor generator MG1, and a power distribution device 2 are added to the drive system of the first embodiment. It may be good. Furthermore, the control device of the present invention can also be applied to an electric vehicle such as a normal engine-driven vehicle or a fuel cell vehicle.
This application claims priority based on Japanese Patent Application No. 2013-50716 filed with the Japan Patent Office on March 13, 2013, the entire disclosure of which is fully incorporated herein by reference.
In a control device for an automatic transmission, which is provided in a drive system of a vehicle and includes an automatic transmission having an engagement clutch as a shift element, and a shift controller that performs shift control of the automatic transmission.
During the shift control for releasing the engagement clutch in response to the first shift request, the shift controller has a second shift request for engaging the engagement clutch before determining whether the engagement clutch has been released. A control device for an automatic transmission that executes a shift control according to the second shift request.
The control device for an automatic transmission according to claim 1,
The engagement clutch is controlled to be engaged / released by stroking the engagement clutch actuator.
The automatic transmission control apparatus, wherein the shift controller determines completion of disengagement of the engagement clutch when a stroke position of the engagement clutch actuator exceeds a preset threshold value.
The automatic transmission control device, wherein the shift controller determines completion of disengagement of the engagement clutch when a differential rotational speed in the engagement clutch exceeds a preset threshold value.
The control apparatus for an automatic transmission according to any one of claims 1 to 3,
The automatic transmission includes the engagement clutch, and a friction clutch that is changed over with the engagement clutch.
The shift controller transmits the torque transmitted by the friction clutch when the shift control according to the first shift request is continued even when the second shift request is received, to the transmission torque when the second shift request is not received. A control device for an automatic transmission, wherein the torque is larger than a transmission torque of the friction clutch during a shift control according to a shift request of 1.
PCT/JP2013/085102 2013-03-13 2013-12-27 Automatic transmission control device WO2014141569A1 (en)
JP2013-050716 2013-03-13
JP2013050716 2013-03-13
CN201380074677.3A CN105008769A (en) 2013-03-13 2013-12-27 Automatic transmission control device
JP2013085102A JPWO2014141569A1 (en) 2013-03-13 2013-12-27 Control device for automatic transmission
EP13877918.6A EP2975301A4 (en) 2013-03-13 2013-12-27 Automatic transmission control device
US14/769,253 US20150375750A1 (en) 2013-03-13 2013-12-27 Automatic transmission control device
WO2014141569A1 true WO2014141569A1 (en) 2014-09-18
ID=51536254
PCT/JP2013/085102 WO2014141569A1 (en) 2013-03-13 2013-12-27 Automatic transmission control device
US (1) US20150375750A1 (en)
EP (1) EP2975301A4 (en)
JP (1) JPWO2014141569A1 (en)
CN (1) CN105008769A (en)
WO (1) WO2014141569A1 (en)
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2013-12-27 WO PCT/JP2013/085102 patent/WO2014141569A1/en active Application Filing
2013-12-27 CN CN201380074677.3A patent/CN105008769A/en not_active Application Discontinuation
2013-12-27 JP JP2013085102A patent/JPWO2014141569A1/en active Pending
2013-12-27 US US14/769,253 patent/US20150375750A1/en not_active Abandoned
2013-12-27 EP EP13877918.6A patent/EP2975301A4/en not_active Withdrawn
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