WO2017209229A1

WO2017209229A1 - Control device for dual clutch transmission

Info

Publication number: WO2017209229A1
Application number: PCT/JP2017/020401
Authority: WO
Inventors: 健宏江浪; 佑輔高橋
Original assignee: いすゞ自動車株式会社
Priority date: 2016-06-01
Filing date: 2017-06-01
Publication date: 2017-12-07
Also published as: JP2017214990A

Abstract

A transmission control device 80 comprises a transmission control unit 83 configured such that during an upshift accompanied by a clutch (21 or 22) switch and a gear change in which the rotation speed of an input shaft (31 or 32) connected to the engagement-side clutch is higher than the rotation speed of the engine 10, or during a downshift accompanied by a clutch switch and a gear change in which the rotation speed of the input shaft is lower than the rotation speed of the engine 10, the transmission control unit 83 places the engagement-side clutch in the engaged state for at least a portion of the time period from completion of the disengagement of the gear prior to shifting to when the rotation speed of the input shaft matches the rotation speed of the engine 10, then places the engagement-side clutch in the disengaged state and begins the engagement of the target gear, and fully engages the engagement-side clutch after completion of the engagement of the gear.

Description

Control device for dual clutch transmission

In the present disclosure, a clutch device including two clutches is provided between a drive source and a speed change mechanism, and a drive force transmission path from the drive source to the vehicle drive system can be switched to a system via any one of the clutches. The present invention relates to a control device for a clutch transmission.

Dual clutch capable of switching the driving force transmission path from the driving source to the transmission via any one of the clutches, with two clutches capable of connecting / disconnecting the driving force from the driving source such as the engine by hydraulic oil pressure A clutch type transmission is known.

In such a dual clutch transmission, for example, an even-numbered transmission gear and an odd-numbered transmission gear are arranged on different intermediate shafts, a sub-transmission unit that switches between a high-speed stage and a low-speed stage, There are various devices having different configurations, such as those including a transmission mechanism including a shaft having a plurality of transmission gears shared by the high speed stage and the low speed stage.

For example, in a dual clutch transmission in which an even-numbered transmission gear and an odd-numbered transmission gear are arranged on separate intermediate shafts, the speed of the two intermediate shafts can be changed to be the same so that the transmission gears can be switched. A technique is known in which a speed change is performed quickly by preliminarily fastening a speed change gear after a speed change (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-210027

¡Dual-clutch transmissions are required to be able to shift quickly.

For example, the technique described in Patent Document 1 is a technique that can be applied to a dual clutch transmission in which an even-numbered transmission gear and an odd-numbered transmission gear are arranged on different intermediate shafts. It cannot be applied to the type transmission. For example, a sub-transmission having a first input shaft connected to the first clutch, a second input shaft connected to the second clutch, and a sub-shaft always connected to the first input shaft and the second input shaft. It cannot be applied to a dual clutch transmission equipped with a section.

The present disclosure provides a technique capable of quickly performing a shift in a dual clutch transmission having a sub-transmission unit at the time of a shift involving switching of a clutch to be engaged and a gear change.

A control device for a dual clutch transmission according to an aspect of the present disclosure includes a clutch device including a first clutch and a second clutch between a drive source and a transmission mechanism, and driving from the drive source to the vehicle drive system. A control device for a dual clutch transmission capable of switching a force transmission path between two systems, a system via a first clutch and a system via a second clutch, and a first input shaft connected to the first clutch; A first splitter that has a second input shaft connected to the second clutch, and a first shaft that is always connected to the first input shaft and the second input shaft, and that connects the first input shaft and the second shaft. The gear pair and the second splitter gear pair that connects the second input shaft and the sub shaft include a sub transmission unit having a different gear ratio, and an engaged state between the first clutch and the second clutch. Change the clutch to be connected and connected to the vehicle drive train In the engagement side clutch, which is the clutch to be engaged in the engagement state of the first clutch and the second clutch in the state before the shift up when the gear coupled to the output shaft is changed. Shifting down when the rotational speed of the connected input shaft is higher than the rotational speed of the drive source, or by changing the clutch to be engaged and changing the gear coupled to the output shaft connected to the vehicle drive system At least one of the cases where the rotational speed of the input shaft connected to the engaging clutch is lower than the rotational speed of the drive source in the state before the shift down, the gear-out of the gear before the change is completed A synchronous auxiliary control means for engaging the engagement-side clutch in at least a part of time after which the rotation speed of the input shaft matches the rotation speed of the drive source; A gear-in control means for setting the engagement-side clutch in a disengaged state and then starting gear-in of the gear to be changed; and a gear-shift end control means for setting the engagement-side clutch in the fully engaged state after the gear-in of the change-destination gear is completed; Have

In the control device for the dual clutch transmission, the synchronization auxiliary control means is configured to be connected between the time immediately after the gear-out of the gear before the change is completed and the time when the rotational speed of the input shaft matches the rotational speed of the drive source. The clutch may be engaged.

According to the present disclosure, in a dual clutch transmission having a sub-transmission unit, it is possible to perform a speed change at the time of a speed change that involves switching of a clutch to be engaged and a gear change.

FIG. 1 is a schematic configuration diagram illustrating a dual clutch transmission including a dual clutch device according to an embodiment of the present disclosure. FIG. 2 is a flowchart of a shift control process according to an embodiment of the present disclosure. FIG. 3 is a schematic diagram illustrating changes in the first input shaft rotational speed, the second input shaft rotational speed, and the engine rotational speed during upshifting and downshifting according to an embodiment of the present disclosure.

Hereinafter, a shift control device that is an example of a control device for a dual clutch transmission according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

FIG. 1 is a schematic configuration diagram illustrating a dual clutch transmission including a dual clutch device according to an embodiment of the present disclosure.

The dual clutch transmission 1 is connected to an output shaft 11 of an engine 10 which is an example of a drive source.

The dual clutch transmission 1 includes a dual clutch device 20 having a first clutch 21 and a second clutch 22, a transmission mechanism 30, a transmission control device 80 as an example of a control device, an engine speed sensor 91, A first input shaft rotational speed sensor 92, a second input shaft rotational speed sensor 93, a vehicle speed sensor 94 (also referred to as an output rotational speed sensor), and an accelerator opening sensor 95 are provided.

The first clutch 21 is, for example, a wet multi-plate clutch, and includes a clutch hub 23 that rotates integrally with the output shaft 11 of the engine 10, and a first clutch drum 24 that rotates integrally with the first input shaft 31 of the transmission mechanism 30. A plurality of first clutch plates 25, a first space 21A around the plurality of first clutch plates 25, a first piston 26 press-contacting the first clutch plates 25, and a first hydraulic chamber 26A. ing.

When the first piston 26 strokes to the output side (right direction in FIG. 1) due to the pressure of hydraulic oil (hydraulic pressure) supplied to the first hydraulic chamber 26A, the first clutch plate 25 is pressed against the first clutch 21. Thus, a connection state (fastening state) for transmitting torque is obtained. On the other hand, when the operating hydraulic pressure in the first hydraulic chamber 26A is released, the first piston 26 is stroked to the input side (left direction in FIG. 1) by a biasing force of a spring (not shown), and the first clutch 21 transmits torque. It will be in the disconnection state which interrupts (power transmission). In the following description, the state in which torque is transmitted via the first clutch plate 25 while the clutch hub 23 and the first clutch drum 24 rotate at different rotational speeds is referred to as a half-clutch state of the first clutch 21. In other words, a state in which torque is transmitted through the first clutch plate 25 while the clutch hub 23 and the first clutch drum 24 rotate at the same rotational speed is referred to as a clutch engaged state of the first clutch 21 or a fully engaged state. Called. The half-clutch state is an aspect of the engaged state. Hydraulic fluid is supplied to the first space 21A in order to discharge frictional heat and the like generated in the first clutch plate 25.

The second clutch 22 is, for example, a wet multi-plate clutch, and includes a clutch hub 23, a second clutch drum 27 that rotates integrally with the second input shaft 32 of the transmission mechanism 30, and a plurality of second clutch plates 28. A second space 22A around the plurality of second clutch plates 28, a second piston 29 press-contacting the second clutch plates 28, and a second hydraulic chamber 29A are provided.

In the second clutch 22, when the second piston 29 is stroked to the output side (right direction in FIG. 1) by the hydraulic pressure supplied to the second hydraulic chamber 29 </ b> A, the second clutch plate 28 is pressed to transmit torque. Connected state (fastened state). On the other hand, when the operating hydraulic pressure is released, the second piston 29 is stroked to the input side (left direction in FIG. 1) by a biasing force of a spring (not shown), and the second clutch 22 is in a disconnected state in which torque transmission is interrupted. Become. In the following description, the state in which the torque is transmitted via the second clutch plate 28 while the clutch hub 23 and the second clutch drum 27 rotate at different rotational speeds is referred to as the half-clutch state of the second clutch 22. In other words, a state in which torque is transmitted through the second clutch plate 28 while the clutch hub 23 and the second clutch drum 27 rotate at the same rotational speed is referred to as a clutch engaged state of the second clutch 22 or a fully engaged state. Called. The half-clutch state is an aspect of the engaged state. Hydraulic fluid is supplied to the second space 22A in order to discharge frictional heat and the like generated in the second clutch plate 28.

The transmission mechanism 30 includes a sub-transmission unit 40 disposed on the input side and a main transmission unit 50 disposed on the output side. The transmission mechanism 30 includes a first input shaft 31 and a second input shaft 32 provided in the sub-transmission unit 40, an output shaft 33 provided in the main transmission unit 50, and parallel to these shafts 31 to 33. The counter shaft 34 is provided. The first input shaft 31 is inserted into a hollow shaft that penetrates the second input shaft 32 in the axial direction so as to be relatively rotatable. A propeller shaft (vehicle drive system) connected to a vehicle drive wheel (not shown) via a differential device or the like is connected to the output end of the output shaft 33.

The auxiliary transmission unit 40 is provided with a first splitter gear pair 41 and a second splitter gear pair 42. The first splitter gear pair 41 includes a first input main gear 43 fixed to the first input shaft 31, and a first input sub gear 44 fixed to the sub shaft 34 and constantly meshing with the first input main gear 43. It has. The second splitter gear pair 42 includes a second input main gear 45 fixed to the second input shaft 32, and a second input sub gear 46 fixed to the sub shaft 34 and constantly meshing with the second input main gear 45. It has. Therefore, the sub shaft 34, the first input shaft 31, and the second input shaft 32 are always coupled. In the present embodiment, the gear ratio of the first splitter gear pair 41 is smaller than that of the second splitter gear pair 42, that is, the first splitter gear pair 41 side is a high-speed gear stage. Therefore, in the auxiliary transmission unit 40, when the driving force is transmitted via the first splitter gear pair 41 (when the first clutch 21 is engaged), the auxiliary transmission unit 40 can be set to the high speed side, and the second splitter gear. When the driving force is transmitted via the pair 42 (when the second clutch 22 is engaged), the speed can be reduced. Here, the case through the first splitter gear pair 41 is referred to as an H (high speed side) stage, and the case through the second splitter gear pair 42 is referred to as an L (low speed side) stage.

The main transmission unit 50 is provided with a first output gear pair 51, a second output gear pair 61, a third output gear pair 71, a first sync mechanism 55, and a second sync mechanism 56. The first output gear pair 51 includes a third-speed sub-gear 52 fixed to the sub-shaft 34 and a third-speed main gear 53 that is rotatably provided on the output shaft 33 and always meshes with the third-speed sub-gear 52. I have. The second output gear pair 61 includes a second-speed sub-gear 62 fixed to the sub-shaft 34 and a second-speed main gear 63 that is provided on the output shaft 33 so as to be relatively rotatable and always meshes with the second-speed sub-gear 62. I have. The third output gear pair 71 includes a first-speed sub-gear 72 fixed to the sub-shaft 34, and a first-speed main gear 73 that is rotatably provided on the output shaft 33 and always meshes with the first-speed sub-gear 72. I have.

The first sync mechanism 55 and the second sync mechanism 56 are known structures, and each includes a sleeve, a dog clutch, etc. (not shown). The first sync mechanism 55 can bring the output shaft 33 and the third-speed main gear 53 into an engaged state (gear-in). When the output shaft 33 and the third-speed main gear 53 are engaged, if the sub-transmission unit 40 is in the H stage, the output shaft 33 rotates at a speed corresponding to the third H-speed (3H speed) and the sub-transmission unit. If 40 is the L stage, the output shaft 33 rotates at a speed corresponding to the 3rd speed (3L speed) of the L stage.

The second synchronization mechanism 56 can bring the output shaft 33 and the second speed main gear 63 into an engaged state, and can bring the output shaft 33 and the first speed main gear 73 into an engaged state. When the output shaft 33 and the second-speed main gear 63 are engaged, if the sub-transmission unit 40 is in the H stage, the output shaft 33 rotates at a speed equivalent to the H-stage second speed (2H speed). If 40 is the L stage, the output shaft 33 rotates at the second speed of the L stage (2L speed). Further, when the output shaft 33 and the first-speed main gear 73 are engaged, if the sub-transmission unit 40 is in the H stage, the output shaft 33 rotates at a speed corresponding to the first speed (1H speed) in the H stage. If the transmission unit 40 is in the L stage, the output shaft 33 rotates at the first speed of the L stage (1L speed).

In the transmission mechanism 30, the auxiliary transmission unit 40 and the main transmission unit 50 can be switched to 1L speed, 1H speed, 2L speed, 2H speed, 3L speed, and 3H speed. In the speed change mechanism 30, the speed is 1L speed, 1H speed, 2L speed, 2H speed, 3L speed, and 3H speed in order from the low speed stage. The operations of the first sync mechanism 55 and the second sync mechanism 56 are controlled by a shift control unit 83, which will be described later, depending on the accelerator opening detected by the accelerator opening sensor 95, the speed detected by the speed sensor 94, and the like. Accordingly, the output shaft 33 and the output main gear (53, 63, 73) are selectively switched to the engaged state (gear-in) or the non-engaged state (neutral state). The number of output gear pairs (51, 61, 71) and the synchro mechanisms (55, 56), the arrangement pattern, and the like are not limited to the illustrated examples, and may be changed as appropriate without departing from the spirit of the present disclosure. Is possible.

In the speed change mechanism 30, at the time of shifting between 1L speed and 1H speed, between 2L speed and 2H speed, between 3L speed and 3H speed (shift up and shift down), the speed is changed only by switching the clutch. When shifting between 1H speed and 2L speed and between 2H speed and 3L speed (shift up and shift down), it is necessary to perform clutch switching and gear change.

Further, in the speed change mechanism 30, when shifting up with clutch switching and gear change (shifting from 1H speed to the next 2L speed (adjacent to the gear ratio)) shifting up from 2H speed to the next 3L speed Etc.), the rotational speed of the second input shaft 32 connected to the engagement-side clutch (second clutch 22) is higher than the rotational speed of the engine 10 in the state before the upshift due to the configuration of the speed change mechanism 30. ing. Therefore, in the speed change mechanism 30, during the shift up involving clutch switching and gear change, the rotational speed of the second input shaft 32 connected to the engagement side clutch (second clutch 22) is higher than the rotational speed of the engine 10. Become. Further, in the speed change mechanism 30 of the present embodiment, at the time of shift down accompanied by clutch switching and gear change (shift down from 2L speed to adjacent 1H speed, shift down from 3L speed to adjacent 2H speed, etc.) Due to the configuration of the transmission mechanism 30, the rotational speed of the first input shaft 31 connected to the engagement-side clutch (first clutch 21) is lower than the rotational speed of the engine 10 in the state before the downshift. Therefore, in the speed change mechanism 30, the speed of the first input shaft 31 connected to the engagement-side clutch (first clutch 21) is lower than the speed of the engine 10 at the time of downshifting involving clutch switching and gear change. Become.

The engine speed sensor 91 detects the speed of the engine 10 and outputs it to the shift control device 80. The first input shaft rotational speed sensor 92 detects the rotational speed of the first input shaft 31 and outputs it to the transmission control device 80. The second input shaft rotational speed sensor 93 detects the rotational speed of the second input shaft 32 and outputs it to the transmission control device 80. The vehicle speed sensor 94 detects the number of rotations of the output shaft 33 and outputs it to the transmission control device 80. The vehicle speed can be specified from the rotational speed of the output shaft 33. The accelerator opening sensor 95 detects the accelerator opening and outputs it to the shift control device 80.

The shift control device 80 includes a control unit 81, a shift shifter 84, and a hydraulic oil adjustment unit 85.

The control unit 81 performs various controls of the engine 10, the hydraulic oil adjustment unit 85, the shift shifter 84, and the like, and includes a known CPU, ROM, RAM, input port, output port, and the like. In order to perform these various controls, sensor values of various sensors (91 to 95) are input to the control unit 81.

Further, the control unit 81 includes a hydraulic pressure control unit 82, a shift assist control unit, a gear-in control unit, and a shift control unit 83 as an example of a shift end control unit as a part of functional elements. In the present embodiment, these functional elements are described as being included in the control unit 81 that is an integral piece of hardware. However, any one of these functional elements may be provided in separate hardware.

The hydraulic control unit 82 outputs a control signal (control current) to the hydraulic oil adjustment unit 85 in accordance with an instruction from the shift control unit 83.

The shift control unit 83 determines whether or not a shift is necessary based on information such as the accelerator opening from the accelerator opening sensor 95 and the vehicle speed from the vehicle speed sensor 94, and is necessary if a shift is necessary. A specific gear shift (shift destination) is specified. Further, the shift control unit 83 determines whether the required shift is a shift only for clutch switching or a shift accompanied by a gear change (gear shift) for switching the clutch.

The shift control unit 83 instructs the hydraulic control unit 82 to switch the clutch to be engaged in the case of shifting only by clutch switching.

Further, the shift control unit 83 instructs the hydraulic control unit 82 to disengage the clutch (release side clutch) that is engaged before the shift in the case of a shift that involves a gear change (gear shift). The gear shifter 84 is instructed to change gears (gear-out from the current (shift source) gear and gear-in to the change-destination gear). Further, after the gear-out is completed, the shift control unit 83 is configured to change the speed of the input shaft connected to the engagement-side clutch at the time of shifting up, or when the speed is shifted down. When the rotational speed of the input shaft connected to the engagement-side clutch is lower than the rotation speed of the engine 10, the engagement-side clutch is engaged (for example, all engagement state) In this manner, the hydraulic control unit 82 is instructed to supply hydraulic oil.

In the speed change mechanism 30, when shifting down or shifting up with a gear change, when the speed of the input shaft connected to the engagement-side clutch at the time of shifting up is higher than the speed of the engine 10, or Since the rotation speed of the input shaft connected to the engagement side clutch is lower than the rotation speed of the engine 10 at the time of downshifting, it corresponds to any of the cases where the gear change is performed. In 83, there is no need to directly compare the sensor value between the rotational speed of the input shaft connected to the engagement side clutch and the rotational speed of the engine 10.

After the transmission control unit 83 issues an instruction to supply hydraulic oil to the hydraulic control unit 82 so that the engagement side clutch is in the engaged state, the first input shaft rotational speed sensor 92 or the second input shaft rotational speed sensor When the rotational speed of the input shaft connected to the engaging clutch by 93 and the rotational speed of the engine 10 by the engine rotational speed sensor 91 coincide with each other, the hydraulic control unit 82 is set so that the engaging clutch is disengaged. Give instructions to adjust hydraulic fluid.

Thereafter, when the gear-in is completed, the shift control unit 83 issues an instruction to supply hydraulic oil to the hydraulic control unit 82 so that the engagement side clutch is fully engaged.

The shift shifter 84 operates the first sync mechanism 55 and the second sync mechanism 56 in accordance with instructions from the shift control unit 83 to release the engagement state between the output shaft 33 and the output main gears (53, 63, 73). (Gear out) or engage (gear in) the output shaft 33 and the output main gear (53, 63, 73).

The hydraulic oil adjustment unit 85 includes, for example, a linear solenoid valve, and adjusts hydraulic oil from a hydraulic supply source (not shown) according to a control signal (control current) supplied from the hydraulic control unit 82, thereby The amount and pressure of hydraulic fluid supplied to the first hydraulic chamber 26A and the amount and pressure of hydraulic fluid supplied to the second hydraulic chamber 29A are adjusted.

Next, the shift control process by the shift control device 80 will be described.

FIG. 2 is a flowchart of a shift control process according to an embodiment of the present disclosure.

The shift control process is executed when the shift control unit 83 determines that a shift is necessary.

The shift control unit 83 determines whether or not the shift is a gear change (gear shift) (S11). As a result, when the gear shift is not accompanied by a gear change (S11: NO), the gear shift control unit 83 controls the hydraulic oil adjustment unit 85 by the hydraulic pressure control unit 82, and is currently engaged and released. The clutch on the side to be engaged (release side clutch) is disengaged (S21), the clutch on the engagement side is engaged (S22), and the process is terminated.

On the other hand, when the speed change involves gear change (S11: YES), the speed change control unit 83 controls the hydraulic oil adjustment unit 85 by the hydraulic pressure control unit 82 to disengage the disengagement side clutch (S12). Then, the shift shifter 84 is controlled to start gear-out of the current gear (transmission source gear) engaged with the output shaft 33 (S13).

Next, the shift control unit 83 determines whether or not the gear-out of the shift source gear has been completed (S14). If the gear-out has not been completed (S14: NO), step S14 is executed again.

On the other hand, when the gear-out has been completed (S14: YES), the shift control unit 83 controls the hydraulic oil adjustment unit 85 by the hydraulic control unit 82 to put the engagement side clutch in the engaged state (S15). . As a result, the rotational speed of the input shaft connected to the clutch on the engagement side changes so as to approach the rotational speed of the engine 10 (decreases when shifting up, increases when shifting down). Note that the frictional force of the engagement side clutch can be larger than the frictional force at the time of synchronization by the first synchro mechanism 55 or the second synchro mechanism 56, so that the friction force of the engagement side clutch is greater than the case of synchronizing by the first synchro mechanism 55 or the second synchro mechanism 56. The rotational speed of the input shaft can be brought close to the rotational speed of the engine 10 in a short time.

Next, the shift control unit 83 determines whether or not the rotational speed of the input shaft connected to the engagement-side clutch matches the rotational speed of the engine 10 by the engine rotational speed sensor 91 (S16). As a result, when the rotation speed of the input shaft does not match the rotation speed of the engine 10 (S16: NO), the shift control unit 83 executes step S16 again.

On the other hand, when the rotational speed of the input shaft matches the rotational speed of the engine 10 (S16: YES), the rotational speed of the input shaft cannot be separated from the rotational speed of the engine 10 as it is. In step S17, the hydraulic control unit 82 controls the engagement side clutch 83 to be in a disengaged state.

Next, the shift control unit 83 controls the shift shifter 84 to start gear-in of the shift destination gear (S18). Thus, thereafter, the input shaft connected to the engagement side clutch and the output shaft 33 are synchronized by the function of the first synchronization mechanism 55 or the second synchronization mechanism 56. Here, since the rotational speed of the input shaft to which the engagement-side clutch is already connected is the same as the rotational speed of the engine 10 and approaches the assumed rotational speed after the shift, the first synchronization mechanism 55 or the first The synchronization time by the two synchronization mechanisms 56 is short, and the load applied to the synchronization ring of the first synchronization mechanism 55 or the second synchronization mechanism 56 can be reduced.

Next, the shift control unit 83 determines whether or not the gear-in of the shift destination gear is completed (S19). If the gear-in is not completed (S19: NO), the shift control unit 83 performs step S19. Run again.

On the other hand, when the gear-in is completed (S19: YES), the shift control unit 83 controls the hydraulic oil adjustment unit 85 by the hydraulic control unit 82 to bring the engagement side clutch into a completely engaged state (S20). .

Next, changes in various states during shifting of the dual clutch transmission 1 according to the present embodiment will be described.

FIG. 3 is a schematic diagram illustrating changes in the first input shaft rotational speed, the second input shaft rotational speed, and the engine rotational speed at the time of upshifting and downshifting according to an embodiment of the present disclosure.

Referring to FIG. 3, an example of shifting up from a 2H speed to a 3L speed will be described as an example of a shift up accompanied by a gear change.

At the time T0 before the start of the upshifting, the first clutch 21 that is the disengagement side clutch is in a completely engaged state, so that the engine speed and the rotation of the first input shaft 31 connected to the first clutch 21 are increased. The number (the first input shaft rotational speed) is the same rotational speed. On the other hand, the rotational speed of the second input shaft 32 (second input shaft rotational speed) connected to the second clutch 22 that is the engagement side clutch is such that the first clutch 21 and the second clutch 22 are connected via the auxiliary shaft 34 and the like. Therefore, the rotation speed is higher than the first input shaft rotation speed.

In the period T1, when the shift control unit 83 determines that a shift-up from 2H speed to 3L speed with a gear change is necessary, the shift control unit 83 disengages the first clutch 21 by the hydraulic control unit 82. Control to be in a state.

Next, the shift control unit 83 starts the movement of the sleeve (not shown) of the second sync mechanism 56 by the shift shifter 84 to perform the gear-out of the second speed main gear 63.

After the gear-out is completed, the shift control unit 83 controls the hydraulic oil adjustment unit 85 by the hydraulic control unit 82 to place the second clutch 22 in the engaged state. Thereby, the second input shaft rotational speed decreases so as to approach the rotational speed of the engine 10 ((1) in FIG. 3).

Next, when the second input shaft rotation speed and the engine rotation speed match, the shift control section 83 controls the hydraulic oil adjustment section 85 to disengage the second clutch 22.

Further, the shift control unit 83 controls the shift shifter 84 to start the movement of a sleeve (not shown) of the first sync mechanism 55 and starts the gear-in of the shift destination gear (third speed main gear 53). As a result, the first synchronization mechanism 55 synchronizes the output shaft 33 (the sleeve of the first synchronization mechanism 55) and the third-speed main gear 53 (FIG. 3 (2)). When the synchronization is completed, the first synchronization is completed. The mechanism 55 moves the sleeve to a position where it is coupled with the dog gear of the third-speed main gear 53, and the gear-in is completed.

When the gear-in of the third-speed main gear 53 is completed, the transmission control unit 83 controls the second clutch 22 to be in the engaged state by the hydraulic control unit 82. As a result, the engine speed and the second input shaft speed coincide with each other (the period T1).

After this, when the accelerator opening increases, the second input shaft rotational speed increases as the engine rotational speed increases (time point T2).

Next, as a case of a downshift accompanied by a gear change, for example, a case of shifting from 3L speed to 2H speed will be described as an example with reference to FIG.

At time T10 before the start of downshifting, the second clutch 22 that is the disengagement side clutch is in a completely engaged state, so that the engine speed and the rotation of the second input shaft 32 connected to the second clutch 22 are increased. The number (second input shaft rotational speed) is the same rotational speed. On the other hand, the rotational speed of the first input shaft 31 (first input shaft rotational speed) connected to the first clutch 21 that is the engagement-side clutch is such that the first clutch 21 and the second clutch 22 are connected via the auxiliary shaft 34 and the like. Therefore, the rotational speed is lower than the second input shaft rotational speed.

In the period T11, when the shift control unit 83 determines that a downshift from 3L speed to 2H speed with gear change is necessary, the shift control unit 83 disengages the second clutch 22 by the hydraulic control unit 82. Control to be in the state.

Next, the shift control unit 83 starts the movement of the sleeve (not shown) of the first sync mechanism 55 by the shift shifter 84 and performs the gear-out of the third speed main gear 53.

After the gear-out is completed, the shift control unit 83 controls the hydraulic oil adjustment unit 85 with the hydraulic control unit 82 to put the first clutch 21 into the engaged state. Thereby, the first input shaft rotational speed increases so as to approach the rotational speed of the engine 10 ((3) in FIG. 3).

Next, when the first input shaft rotation speed and the engine rotation speed match, the shift control section 83 controls the hydraulic oil adjustment section 85 to put the first clutch 21 in the disengaged state.

Furthermore, the shift control unit 83 controls the shift shifter 84 to start the movement of a sleeve (not shown) of the second sync mechanism 56 and starts the gear-in of the shift destination gear (second speed main gear 63). As a result, the second sync mechanism 56 synchronizes the output shaft 33 (the sleeve of the second sync mechanism 56) and the second-speed main gear 63 (FIG. 3 (4)). The mechanism 56 moves the sleeve to a position where it is coupled with the dog gear of the second-speed main gear 63, and the gear-in is completed.

When the gear-in of the second speed main gear 63 is completed, the transmission control unit 83 controls the first clutch 21 to be in the engaged state by the hydraulic control unit 82. As a result, the engine rotational speed and the first input shaft rotational speed coincide (the period T11).

After this, when the vehicle is decelerated, the first input shaft rotational speed decreases as the engine rotational speed decreases (time T12).

As described above, according to the shift control device 80 according to the present embodiment, the input shaft connected to the engagement-side clutch is in the state before the shift-up at the time of the shift-up involving the clutch switching and the gear change. When the rotational speed is higher than the engine rotational speed, or at the time of downshifting involving clutch switching and gear change, and before the downshifting, the rotational speed of the input shaft connected to the engaging clutch is the engine rotational speed. In any case that is lower than the number, the engagement-side clutch is engaged after the gear-out of the gear before the change is completed until the rotation speed of the input shaft matches the rotation speed of the engine 10. Since it was made into the state, the rotation speed of an input shaft can be changed to engine rotation speed at an early stage. Further, since the rotational speed of the input shaft can be changed to the engine rotational speed at an early stage, it is necessary for the synchronization between the output shaft 33 and the transmission gear of the shift destination including the subsequent synchronization by the synchro mechanism (55, 56). The time can be shortened and the load on the synchronization mechanism (55, 56) can be effectively reduced.

It should be noted that the present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, in the above embodiment, after the gear-out is completed, the engagement-side clutch is engaged until the rotation speed of the input shaft connected to the engagement-side clutch matches the rotation speed of the engine 10. However, the present disclosure is not limited to this, and after the gear-out is completed, the engagement is performed in a part of time between the rotation speed of the input shaft connected to the engagement-side clutch and the rotation speed of the engine 10. The side clutch may be engaged. In short, after the gear-out is completed, at least one of the rotation speed of the input shaft connected to the engagement side clutch and the rotation speed of the engine 10 coincides. The fastening side clutch may be fastened at the time of the part.

This application is based on a Japanese patent application (Japanese Patent Application No. 2016-109840) filed on June 1, 2016, the contents of which are incorporated herein by reference.

According to the control device for a dual clutch transmission of the present disclosure, in a dual clutch transmission having a sub-transmission unit, a speed change can be quickly performed at the time of a shift accompanied by switching of a clutch to be engaged and a gear change. it can.

DESCRIPTION OF SYMBOLS 1 Dual clutch type transmission 10 Engine 11 Output shaft 20 Dual clutch apparatus 21 1st clutch 22 2nd clutch 26,29 Piston 26A 1st hydraulic chamber 29A 2nd hydraulic chamber 30 Transmission mechanism 31 1st input shaft 32 2nd input shaft 33 Output shaft 34 Sub shaft 40 Sub transmission unit 41 First splitter gear pair 42 Second splitter gear pair 50 Main transmission unit 51 First output gear pair 52 Third speed sub gear 53 Third speed main gear 55 First sync mechanism 56 Second Synchro mechanism 61 2nd output gear pair 62 2nd speed sub gear 63 2nd speed main gear 71 3rd output gear pair 72 1st speed sub gear 73 1st speed main gear 80 Transmission control device 81 Control unit 82 Hydraulic control section 83 Transmission control section 84 Speed shifter 85 Hydraulic oil adjuster

Claims

A clutch device including a first clutch and a second clutch is provided between the drive source and the speed change mechanism, and a drive force transmission path from the drive source to the vehicle drive system is connected to the system via the first clutch and the second clutch. A control device for a dual clutch transmission that can be switched to two systems with a system via a clutch,
A first input shaft connected to the first clutch; a second input shaft connected to the second clutch; and a countershaft always connected to the first input shaft and the second input shaft. The first splitter gear pair that connects the first input shaft and the sub shaft and the second splitter gear pair that connects the second input shaft and the sub shaft have different gear ratios. A transmission unit;
A shift-up operation involving a change of a clutch to be engaged between the first clutch and the second clutch, and a change of a gear coupled to an output shaft connected to the vehicle drive system, In the state before the up, the rotational speed of the input shaft connected to the engagement-side clutch that is the clutch to be engaged in the first clutch and the second clutch is higher than the rotational speed of the drive source. In the state before the downshift, when the gear is down, or at the time of the downshift involving the change of the clutch to be engaged and the change of the gear coupled to the output shaft connected to the vehicle drive system, In at least one of the cases where the rotational speed of the input shaft connected to the side clutch is lower than the rotational speed of the drive source, the input after the gear-out of the gear before change is completed At least part of the time until the rotational speed matches the rotational speed of the driving source, and the auxiliary synchronizing control means for the engagement state of the engagement side clutch,
A gear-in control means for setting the engagement-side clutch in the engagement state to a disengagement state, and then starting gear-in of the gear of the shift destination;
And a shift end control means for bringing the engagement-side clutch into a fully engaged state after the gear-in of the change destination gear is completed.
The synchronous auxiliary control means puts the engagement side clutch into an engaged state immediately after the gear-out of the gear before the change is completed and until the rotational speed of the input shaft matches the rotational speed of the drive source. Item 2. A control apparatus for a dual clutch transmission according to Item 1.