JP2009293739A - Transmission and control method of transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission and a control method of the transmission, capable of reducing cost, and capable of miniaturizing the transmission, by reducing the number of synchronizing devices, without reducing the synchronizing action. <P>SOLUTION: This transmission 11 has a shift mechanism 3 arranged in response to a synchronizing shift stage being a part of shift stages and having the synchronizing devices 371 and 375 for reducing a relative rotating speed by frictional engagement of itself between an input shaft 20 and the synchronizing shift stage, a shifting means 51 for controlling actuators 421-423 so as to move sleeves 411-413 corresponding to the next shift stage to an engaging position from a neutral position, and a control means 5 having a synchronizing means 52 for moving the sleeve 411 corresponding to the selected synchronizing shift stage to a synchronizing position until the relative rotating speed between the input shaft 20 and the next shift stage becomes a predetermined value or less by selecting one of the synchronizing shift stages. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission and a transmission control method, and more particularly to a transmission having a plurality of actuators that move a sleeve and a transmission control method.

  The automobile is provided with a transmission for converting engine power according to driving conditions and taking it out. There are gear type and belt type transmissions, and gear type transmissions with little power transmission loss are often used.

  A gear-type transmission is a device that switches a plurality of transmission gears for the purpose of outputting input engine power in accordance with traveling conditions. This transmission has a plurality of speed change gears, and one of the speed change gears is selected and switched to that speed change gear.

  The transmission is provided with a synchronizer in order to quickly and easily shift gears when switching gears. The synchronization device converts the input engine power in accordance with the traveling speed and switches it to a transmission gear that transmits to the wheel side, and a hub that rotates integrally with the input shaft and a transmission gear that rotates relative to the input shaft. It is a device for synchronizing rotation. After synchronization, the transmission is engaged with the transmission gear, that is, the transmission gear is engaged, and the transmission gear shifting is completed.

By the way, Patent Document 1 discloses a lever member that boosts and presses the synchronizing device by the action of the lever to improve the synchronizing action. By improving the synchronization action, there is an advantage that the synchronization time can be reduced and the shift time can be shortened. However, since the transmission includes the synchronization device, the transmission is extended in the axial direction of the input shaft. In addition, when the lever member is disposed, the lever member is further extended in the axial direction, and the transmission is increased in size. Therefore, Patent Document 2 discloses a lever member that boosts and presses the synchronizing device by lever action to improve the synchronizing action and does not extend in the axial direction even if it is arranged in the transmission.
JP-A-9-89002 JP 2002-174261 A

  However, even if the synchronizing action is boosted as in Patent Document 1 and Patent Document 2, the synchronizing device itself is expensive because the synchronizing device itself disposed in the transmission is expensive. This is one of the reasons for the increase. In addition, as the number of synchronizers increases due to the multistage, the transmission becomes larger. Furthermore, when assembly parts increase, such as using a lever member, there also exists a problem that an assembly becomes complicated.

  The present invention has been made in view of the above problems, and provides a transmission and a transmission control method that can reduce the number of synchronization devices without reducing the synchronization effect, reduce costs, and reduce the size of the transmission. It is a problem to be solved.

The structural feature of the invention according to claim 1 for solving the above problem can be switched by moving between a connected state connected to a power source and a disconnected state disconnected from the power source. Clutch,
An input shaft connected to the clutch;
An output shaft;
A speed change mechanism having a plurality of speed stages provided between the input shaft and the output shaft;
A sleeve positioned between two of the plurality of gears, having a neutral position that is not engaged with any of the gears, and an engagement position that engages with one of the selected gears; A gear stage selection means having an actuator for moving a sleeve between the neutral position and the engagement position;
Control means for controlling the clutch and the actuator;
A transmission having
The speed change mechanism is provided corresponding to a synchronous speed that is a part of the speed, and the sleeve corresponding to the synchronous speed is between the neutral position and the engagement position. A synchronization device that reduces the relative rotational speed by friction engagement between the input shaft and the synchronous gear stage by pressing toward the engagement position from
The control means includes
Gear changing means for controlling the actuator corresponding to the sleeve so as to select the sleeve corresponding to the next gear speed to be switched and to move the sleeve from the neutral position to the engagement position;
One of the synchronous gears is selected, and the sleeve corresponding to the selected synchronous gear is moved to the synchronous position until the relative rotational speed between the input shaft and the next gear becomes a predetermined value or less. Synchronization means to move,
It is to provide.

  According to a second aspect of the present invention, in the configuration of the first aspect, the control unit includes a rotation number detection unit that detects a rotation number of the input shaft, and the synchronization unit includes the rotation number detection unit. When the rotational speed detected by the above is coincident with the rotational speed of the next shift stage, the actuator is controlled to move the sleeve to the neutral position.

  According to a third aspect of the present invention, in the first or second aspect, the clutch includes a first clutch and a second clutch, and the input shaft is connected to the first clutch. And a second input shaft connected to the second clutch, wherein the synchronizing means moves the sleeve corresponding to the synchronous gear position provided on one of the input shafts having the next gear position to the synchronous position. The actuator corresponding to the sleeve is controlled to move.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the control means compares the rotational speed of the next shift stage with the rotational speed of the input shaft, and When the rotational speed of the input shaft is small, the synchronous gear position having a gear ratio larger than the gear ratio of the next gear position is selected from the synchronous gear speed stages, and when the rotational speed of the input shaft is large, the synchronous gear speed stage is selected. Among them, there is provided synchronous gear selection means for selecting the synchronous gear having a gear ratio smaller than the gear ratio of the next gear.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the synchronous shift speed is a maximum and minimum speed ratio among the shift speeds on the same input shaft. It is that it is the following gear stage.

The structural feature of the invention according to claim 6 for solving the above-described problem is switchable by moving between a connected state connected to a power source and a disconnected state disconnected from the power source. Clutch,
An input shaft connected to the clutch;
An output shaft;
A speed change mechanism having a plurality of speed stages provided between the input shaft and the output shaft;
A sleeve positioned between two of the plurality of gears, having a neutral position that is not engaged with any of the gears, and an engagement position that engages with one of the selected gears; A gear selection means having a number of actuators corresponding to the sleeve for moving the sleeve between the neutral position and the engagement position;
Control means for controlling the clutch and the actuator;
A transmission control method used for a transmission of a vehicle having
The speed change mechanism is provided corresponding to a synchronous speed that is a part of the speed, and the sleeve corresponding to the synchronous speed is between the neutral position and the engagement position. A synchronization device that reduces the relative rotational speed by friction engagement between the input shaft and the synchronous gear stage by pressing toward the engagement position from
A shift step of controlling the actuator corresponding to the sleeve so as to select the sleeve corresponding to the next shift speed which is a shift speed to be switched, and to move the sleeve from the neutral position to the engagement position;
One of the synchronous gears is selected, and the sleeve corresponding to the selected synchronous gear is moved to the synchronous position until the relative rotational speed between the input shaft and the next gear becomes a predetermined value or less. A synchronization step to move,
It is to provide.

  According to a seventh aspect of the present invention, there is provided a structural feature of the invention according to the sixth aspect, further comprising a rotation speed detection step for detecting a rotation speed of the input shaft, wherein the synchronization step is a rotation detected by the rotation speed detection step. When the number coincides with the rotation speed of the next gear, the actuator is controlled to move the sleeve to the neutral position.

  According to an eighth aspect of the present invention, in the sixth or seventh aspect, the clutch includes a first clutch and a second clutch, and the input shaft is connected to the first clutch. And a second input shaft connected to the second clutch, wherein the synchronizing step places the sleeve corresponding to the synchronous gear provided on one input shaft of the next gear in the synchronous position. The actuator corresponding to the sleeve is controlled to move.

  Further, the structural feature of the invention according to claim 9 is that in any one of claims 6 to 8, the rotational speed of the input shaft is compared with the rotational speed of the next shift stage and the rotational speed of the input shaft. Is selected, the synchronous gear having a larger gear ratio than the next gear is selected from among the synchronous gears, and the gear ratio is selected from the next gear among the synchronous gears when the rotational speed of the input shaft is large. A synchronous shift speed selection step for selecting the synchronous shift speed with a small value.

  According to a tenth aspect of the present invention, in any one of the sixth to ninth aspects, the synchronous gear is a maximum and minimum gear ratio among the gears on the same input shaft. It is that it is the following gear stage.

  In the invention according to claim 1, the speed change mechanism includes a synchronizer corresponding to a synchronous gear that is a part of all the gears, and does not include a synchronizer at all the gears. Then, the synchronization means moves the sleeve corresponding to the synchronous gear shift position from the neutral position to the synchronous position until the sleeve corresponding to the next gear shift position is moved from the neutral position to the engagement position and engaged. The actuator corresponding to the sleeve is controlled so as to be pressed from the synchronization position toward the engagement position. That is, when the next gear stage does not include a synchronization device, rotation synchronization with the input shaft can be performed using the synchronization device corresponding to the synchronization gear speed. When the next gear is a synchronous gear, rotation synchronization with the input shaft can be performed using a corresponding synchronizer. When the next gear is a synchronous gear, rotation synchronization with the input shaft can be performed using a synchronizer corresponding to another synchronous gear. Therefore, since the synchronization can be performed by the synchronization devices arranged in the synchronous gears without arranging the same number of synchronization devices as all the gears, the number of synchronization devices can be reduced and the cost can be reduced. Further, as the number of synchronization devices decreases, the total length of the transmission in the input shaft direction is shortened, and the transmission can be downsized.

  In the invention which concerns on Claim 2, the control means is equipped with the rotation speed detection means which detects the rotation speed of an input shaft. Then, in the synchronizing means, when the rotational speed of the input shaft detected by the rotational speed detecting means coincides with the rotational speed of the next gear, the sleeve corresponding to the synchronous gear is used to end the synchronization action in the synchronous gear. Is moved to the neutral position. Therefore, when the input shaft is synchronized with the next gear, the synchronization at the synchronous gear can be completed with good timing.

  In the invention which concerns on Claim 3, the synchronous gear stage is arrange | positioned separately on the 1st input shaft and the 2nd input shaft, respectively. If the next gear is a gear on one input shaft, the next gear can be synchronized using the synchronous gear on one input shaft, and the next gear is on the other input shaft. If the shift speed is the following shift speed, the next shift speed can be synchronized using the synchronous shift speed on the other input shaft. Therefore, even in a transmission having a so-called dual clutch configuration, the number of synchronization devices can be reduced without reducing the synchronization effect, and the cost can be reduced and the transmission can be downsized.

  In the invention according to claim 4, the rotation speed of the next shift stage is compared with the rotation speed of the input shaft, and the speed ratio of the next shift stage is determined by the magnitude relationship between the rotation speed of the input shaft and the rotation speed of the next shift stage. Since the control means is provided with the synchronous gear stage selecting means for selecting the synchronous gear speed with a large or small gear ratio, it is possible to synchronize with an appropriate synchronizer for each gear speed.

  In the invention according to claim 5, the maximum and minimum shift speeds of the speed ratio among the shift speeds are set as the synchronous shift speeds, so that the maximum and minimum shift speeds of the speed ratio can correspond to their own synchronization and the maximum Since the gears between the minimum and the minimum can be synchronized by either gear, the number of synchronizers can be reduced most.

  In the invention according to claim 6, the speed change mechanism is provided with a synchronizer corresponding to a synchronous speed that is a part of all the speeds, and not provided with a synchronizer. The synchronization step moves the sleeve corresponding to the synchronous shift stage from the neutral position to the synchronous position until the sleeve corresponding to the next shift stage is moved from the neutral position to the engagement position and engaged in the shift step. The actuator corresponding to the sleeve is controlled so as to be pressed from the synchronization position toward the engagement position. That is, when the next gear stage does not include a synchronization device, rotation synchronization with the input shaft can be performed using the synchronization device corresponding to the synchronization gear speed. When the next gear is a synchronous gear, rotation synchronization with the input shaft can be performed using a corresponding synchronizer. When the next gear is a synchronous gear, rotation synchronization with the input shaft can be performed using a synchronizer corresponding to another synchronous gear. Therefore, even if not the same number of synchronizers as all the gears are arranged, synchronization can be performed by the synchronizers arranged in the synchronous gears, and the number of synchronizers is reduced, so that the cost can be reduced. Further, as the number of synchronization devices decreases, the total length of the transmission in the input shaft direction is shortened, and the transmission can be downsized.

  In the invention which concerns on Claim 7, the rotation speed detection step which detects the rotation speed of an input shaft is further provided. Then, in the synchronization step, when the rotation speed of the input shaft detected by the rotation speed detection step matches the rotation speed of the next shift speed, the sleeve corresponding to the synchronization speed shift stage is used to end the synchronization action in the synchronization shift speed. Is moved to the neutral position. Therefore, when the input shaft is synchronized with the next gear, the synchronization at the synchronous gear can be completed with good timing.

  In the invention which concerns on Claim 8, the synchronous gear stage is arrange | positioned separately on the 1st input shaft and the 2nd input shaft, respectively. If the next gear is a gear on one input shaft, the next gear can be synchronized using the synchronous gear on one input shaft, and the next gear is on the other input shaft. If the shift speed is the following shift speed, the next shift speed can be synchronized using the synchronous shift speed on the other input shaft. Therefore, even in a transmission having a so-called dual clutch configuration, the number of synchronization devices can be reduced without reducing the synchronization effect, and the cost can be reduced and the transmission can be downsized.

  In the invention according to claim 9, the rotational speed of the next gear stage is compared with the rotational speed of the input shaft, and the speed ratio of the next gear stage is determined by the magnitude relationship between the rotational speed of the input shaft and the rotational speed of the next gear stage. Since there is provided a synchronous gear stage selection step for selecting a synchronous gear stage with a large or small gear ratio, synchronization can be performed by an appropriate synchronizer for each gear stage.

  In the invention according to claim 10, the maximum and minimum shift speeds of the speed ratio among the shift speeds are set as the synchronous shift speeds, so that the maximum and minimum shift speeds of the speed ratio can be synchronized with the own synchronization device. In addition, since the shift speed between the maximum and minimum speed ratios can be synchronized by the synchronization device of one of the synchronous shift speeds, the number of synchronization devices can be reduced most.

  A representative embodiment of the present invention will be described with reference to FIGS. The transmission according to the present embodiment is mounted on a vehicle.

(Embodiment 1)
As shown in FIG. 1, the transmission 11 according to the first embodiment includes a clutch C, an input shaft 20, an output shaft 23, a transmission mechanism 3, a shift speed selection unit 4, and a control unit 5. .

  The clutch C is located between an internal combustion engine output shaft 24 of an internal combustion engine (engine, not shown) as a power source and an input shaft 20 to be described later, and does not transmit the output torque of the internal combustion engine to the input shaft 20 side. It is a device that performs such intermittent. A case where the output torque from the internal combustion engine is transmitted to the input shaft 20 is a connected state, and a case where the output torque from the internal combustion engine is not transmitted to the input shaft 20 is a disconnected state.

  The input shaft 20 is a member that is connected to the clutch C and transmits rotational torque.

  The output shaft 23 is a member that is coaxially disposed in the axial direction of the input shaft 20 and outputs output torque transmitted through the transmission mechanism 3 and the like, which will be described later, to the wheel (not shown) side.

  The speed change mechanism 3 includes a speed stage that is a combination of the first speed to the fifth speed and reverse (reverse) that is provided so as to transmit torque between the input shaft 20 and the output shaft 23, and synchronizers 371 and 375. Have. Gears 1 to 3, 5 and reverse are the transmission gears 31 to 33, 35, and 36 that are rotatably held on the outer peripheral side of the input shaft 20, and the counter shaft 61 that is arranged in parallel to the input shaft 20. And a counter gear 62 corresponding to the transmission gears 31 to 33, 35, and 36, which are fixed so as to be integrally rotatable. The torque from the internal combustion engine is transmitted from a counter shaft side drive gear 65 arranged coaxially with the counter gear 62 to a driven gear 34 fixed to the output shaft 23 so as to be integrally rotatable. In the transmission 11 according to the first embodiment, the fourth gear stage is directly connected to the input shaft 20 and the output shaft 23 without using the counter gear 62. The first speed is the transmission gear 31, the second speed is the transmission gear 32, the third speed is the transmission gear 33, the fifth speed is the transmission gear 35, and the reverse is the transmission gear 36, from the clutch C side toward the output shaft 23 side. The fifth speed, the first speed, the third speed, the second speed, the reverse, and the driven gear 34 are arranged in this order. The synchronization device 371 is located between the first-speed transmission gear 31 and a sleeve 411 described later. The synchronization device 375 is located between the fifth speed gear 35 and the sleeve 411. The shift speeds used as the synchronous shift speeds are the first speed and the fifth speed where the synchronizers 371 and 375 are arranged. The synchronizers 371 and 375 cause the relative rotation speed between the input shaft 20 and the synchronous gears (first gear and fifth gear) by frictional engagement between the input shaft 20 and the synchronous gears (first gear and fifth gear) when the sleeve 411 is pressed from the synchronized position toward the engaged position. It is a device to reduce.

  The gear stage selection means 4 includes sleeves 411 to 413, actuators 421 to 423, forks 431 to 433, and fork shafts 441 to 443. The sleeves 411 to 413 are cylindrical members and are positioned between the two transmission gears so as to be integrally rotatable with the input shaft 20 on the outer peripheral side of the input shaft 20. In the first embodiment, the sleeve 411 is between the fifth speed gear 35 and the first speed gear 31, the sleeve 412 is between the third speed gear 33 and the second speed gear 32, and the sleeve 413 is a reverse speed change gear 36 and a driven gear. 34. The sleeves 411 to 413 have a neutral position that does not engage with any of the gears and an engagement position that engages with the gears 31 to 35. The sleeve 411 is frictionally engaged with the synchronization device 371 or the synchronization device 375 between the engagement position where the sleeve 411 is engaged with the first-speed transmission gear 31 or the fifth-speed transmission gear 35 and the neutral position. Has a position. In addition, the sleeve 412 and the sleeve 413 have a standby position (corresponding to the synchronous position of the sleeve 411 for the synchronous gear) between the neutral position and the engagement position. The actuators 421 to 423 are power sources for moving the sleeves 411 to 413 between the neutral position and the engagement position via the forks 431 to 433 and the fork shafts 441 to 443. The forks 431 to 433 are located on the outer peripheral side of the sleeves 411 to 413 so that the sleeves 411 to 413 can move while rotating between the two gear positions (between the neutral position and the engagement position). The sleeves 411 to 413 are engaged. The fork shafts 441 to 443 are members that are integrally engaged with the forks 431 to 433.

  The reverse has an idler gear 63 between the transmission gear 36 and the counter gear 62. The idler gear 63 is held by an idler gear shaft 64 that is fixed in parallel to the input shaft 20 and the counter shaft 61 so as not to rotate, and is rotatable and movable in the axial direction. When reverse is selected as the gear position, the idler gear 63 moves so as to mesh with both the transmission gear 36 and the counter gear 62, whereby the rotation of the input shaft 20 is transmitted to the reverse transmission gear 36, and the idler gear 63 rotates. Then, the counter gear 62 rotates and the counter shaft 61 rotates.

  The control unit 5 includes a transmission unit 51, a synchronization unit 52, a rotation speed detection unit 53, and a synchronous gear stage selection unit 54. The speed change means 51 selects the sleeves 412 to 413 corresponding to the next speed that is the speed to be switched, and the actuator 421 moves the sleeves 411 to 413 from the neutral position to the standby position and from the standby position to the engagement position. ˜423 are controlled.

  The synchronizing unit 52 selects one of the synchronous gears while the sleeves 411 to 413 corresponding to the next gear in the transmission 51 are waiting in the standby position from the neutral position to the engaged position. To do. Then, the corresponding actuator 421 is controlled to move the sleeve 411 corresponding to the selected synchronous gear to the synchronous position until the relative rotational speed between the input shaft 20 and the next gear is equal to or less than a predetermined value. The control means 5 and the following three control contents of the synchronization means 52 can be considered, and the transmission 11 that controls only one of them or the transmission 11 that is controlled in combination can be used. (1) When the synchronization device corresponding to the next gear is not provided, one of the gears is selected and the relative rotational speed between the input shaft 21 and the next gear is less than or equal to a predetermined value. Until the sleeve corresponding to the selected synchronous gear position is moved to the synchronous position. (2) When the next gear is a synchronous gear, select itself as the synchronous gear, and until the relative rotational speed between the input shaft 21 and the next gear (synchronous gear) becomes a predetermined value or less. The sleeve corresponding to the selected synchronous gear position is moved to the synchronous position. (3) When the next gear stage is a synchronous gear stage, another synchronous gear stage is selected, and the relative rotational speed between the input shaft 21 and the next gear stage (synchronous gear stage) is below a predetermined value. The sleeve corresponding to the selected synchronous gear is moved to the synchronous position, or the sleeve corresponding to the selected synchronous gear is moved to the synchronous position until the input shaft 21 and the next gear are rotationally synchronized. To do.

  The rotational speed detection means 53 detects the rotational speed of the input shaft 20 by a sensor 531 installed on the input shaft 20.

  The synchronous shift speed selection means 54 compares the rotation speed of the next shift speed with the rotation speed of the input shaft 20. When the rotational speed of the input shaft 20 is small, a gear stage having a gear ratio larger than the gear ratio of the next gear stage is selected as the synchronous gear stage. When the rotational speed of the input shaft is large, a gear stage having a gear ratio smaller than the gear ratio of the next gear stage is selected as the synchronous gear stage. In the transmission 11 according to the first embodiment, when selecting a gear stage having a gear ratio larger than the gear ratio of the next gear stage, the first speed is selected as the synchronous gear stage, and the gear ratio smaller than the gear ratio of the next gear stage is selected. When selecting a gear, the fifth gear is selected as the synchronous gear. The rotational speed of the gear stage can be obtained from the speed ratio determined in advance for each gear and the rotational speed (vehicle speed) of the output shaft 23 at that time. Therefore, when the next shift speed is selected, the rotation speed of the next shift speed can be calculated and determined.

  The transmission 11 of the first embodiment is controlled by the control means 5 based on the transmission control method of the present invention. A typical flowchart of the transmission control method is shown in FIGS. 2 to 4 are flowcharts showing an example of the logic of the control method, and the present invention is not limited to this.

  The control means 5 detects the rotation speed of the input shaft 20 by the rotation speed detection means 53 (rotation speed detection step S110). Next, the synchronous shift speed selection means 54 compares the next shift speed with the rotation speed of the input shaft 20 detected at the rotational speed detection step S110, and selects a synchronous shift speed based on the comparison result (synchronous shift speed selection step). S120).

  In the synchronous shift speed selection step S120, the next shift speed is compared with the rotational speed of the input shaft 20 (rotational speed comparison step S121). When the rotational speed of the input shaft 20 is small, a gear stage having a gear ratio larger than that of the next gear stage is selected as the synchronous gear stage (synchronous gear ratio large selection step S122), and the rotational speed of the input shaft 20 is large. Selects a gear having a gear ratio smaller than the gear ratio of the next gear as the synchronous gear (small synchronous gear ratio selection step S123). In the first embodiment, the first gear is selected in the synchronous gear ratio large selection step S122 as the synchronous gear, and the fifth gear is selected in the small synchronous gear ratio selection step.

  Next, the speed change means 51 selects the sleeves 411 to 413 corresponding to the next speed, controls the actuators 421 to 423 corresponding to the sleeves 411 to 413, and shifts the sleeves 411 to 413 from the neutral position to the speed of the next speed. Move to a standby position with the gear side (shift step S130). Then, until the sleeves 411 to 413 reach the engaged position in the shift step S130, the synchronizing means 52 uses the synchronous shift step to synchronize the rotation between the next shift step and the input shaft 20 (synchronous step S140). . In the synchronization step S140, the actuator 421 is controlled to move the sleeve 411 corresponding to the synchronous gear position to the synchronous position (synchronous gear speed synchronization step S141), and after a predetermined time, the rotation speed detection means 53 sets the rotation speed of the input shaft 20. It detects (rotation speed detection step S142). Then, the rotational speed of the next gear stage is compared with the rotational speed of the input shaft 20 (rotational speed comparison step S143). When the rotational speed of the input shaft 20 is not equal to the rotational speed of the next gear stage, the process is repeated from the synchronous gear stage synchronization step S141. If the rotational speeds are equal, the actuator 421 is controlled to move the sleeve 411 corresponding to the synchronous gear position from the synchronous position to the neutral position (synchronization end step S144). Note that, in the rotation speed comparison step S143, the rotation speed of the input shaft 20 is compared with the rotation speed of the next gear, and if they are equal, the synchronization of the synchronous gear shift is finished. The rotation speed close to the rotation speed of the shift speed, that is, the relative rotation speed between the next shift speed and the input shaft 20 may have a predetermined width.

  In the shift step S130, when the synchronization step S140 is completed, the sleeves 411 to 412 corresponding to the next shift stage are moved from the standby position to the engaged position.

  The flow of the transmission 11 according to the first embodiment controlled by the transmission control method is, for example, when shifting to the third speed while traveling at the second speed of the shift speed and shifting to the third speed while traveling at the fourth speed. The case where it does is demonstrated. Here, in both cases, the next gear stage is set to the third speed, and the rotation speed of the third gear stage at that time is R3.

(2nd to 3rd gear)
First, the rotational speed of the input shaft 20 is detected in a rotational speed detection step S110. Next, in the synchronous gear position detection step S120, the input shaft 20 and the rotation speed of the next gear speed 3 are compared. Here, the rotational speed of the input shaft 20 that was rotating at the second speed gear stage is maintained at the rotational speed corresponding to the second speed gear stage immediately after the engagement from the second speed gear stage is released. Therefore, the rotational speeds Rin and R3 satisfy Rin> R3 when the shift speed is quickly switched from the second speed to the third speed. Therefore, when comparing the rotational speed Rin of the input shaft 20 with the rotational speed R3 of the third speed, the rotational speed of the input shaft 20 is large. Therefore, in the synchronous gear ratio small selection step S122, the fifth gear is changed to the synchronous gear. Choose as. In step S130, the sleeve 412 corresponding to the third speed is selected, the corresponding actuator 422 is controlled, and the sleeve 412 is moved to the standby position between the neutral position and the third speed gear 33 side. . In the shift step S130, the synchronization step S140 is executed while the sleeve 412 is moved to the standby position. In the synchronous gear shift step S141 of the synchronous step S140, the sleeve 411 corresponding to the fifth gear is selected, the corresponding actuator 421 is controlled, and the sleeve 411 is moved to the synchronous position. Then, after a predetermined time, the rotational speed of the input shaft 20 is detected in the rotational speed detection step S142. If the rotational speed of the input shaft 20 is R3 in the rotational speed comparison step S143, the synchronization end step S144 is executed. In the synchronization end step S144, the synchronization means 52 moves the sleeve 411 corresponding to the fifth speed gear stage from the synchronization position to the neutral position by controlling the actuator 421. When the rotational speed of the input shaft 20 detected in the rotational speed detection step S142 has not reached the rotational speed of the next gear stage, the process is repeated from the synchronous gear stage synchronization step S141 until the rotational speed is reached. In the shift step S130, when the synchronization step S140 is completed, the sleeve 412 corresponding to the next shift stage is moved from the standby position to the engaged position.

  FIG. 5 is a timing chart showing the relationship between the rotational speed of the input shaft 20, the shift stroke of the synchronous gear stage, and the shift stroke of the next gear stage. The shift stroke of the gear stage is displayed in correspondence with the positions of the sleeves 414 and 415. The shift step S130 and the synchronization step S140 are executed at the time T1, and the rotation speed of the input shaft 20 has reached R3 at the time T2, so that the synchronization of the synchronous shift stage is ended at the synchronization end step S144. In synchronization step S130, the sleeve 415 moves from the standby position at time T2, and is positioned at the engagement position where it engages with the third gear at time T3.

(4-speed to 3-speed)
In the rotational speed detection step S110, the rotational speed of the input shaft 20 is detected. Next, in the synchronous gear position detection step S120, the input shaft 20 and the rotation speed of the next gear speed 3 are compared. Here, the rotational speed of the input shaft 20 that has been rotating at the fourth speed is maintained at the rotational speed corresponding to the fourth speed immediately after the engagement from the fourth speed is disengaged. Therefore, the rotational speeds Rin and R3 satisfy Rin <R3 when the gear position is quickly switched from the fourth speed to the third speed. Accordingly, since the rotational speed of the input shaft 20 is small, the first speed is selected as the synchronous gear position in the synchronous gear ratio large selection step S123. Next, in the shift step S130, the sleeve 412 corresponding to the third speed is selected, the corresponding actuator 422 is controlled, and the sleeve 412 is moved to the standby position. While the sleeve 412 is waiting at the standby position in the shift step S130, the synchronization step S140 is executed. In the synchronous gear shift step S141, the sleeve 411 corresponding to the first gear is selected, the corresponding actuator 421 is controlled, and the sleeve 411 is moved to the synchronous position. Then, after a predetermined time, the rotational speed of the input shaft 20 is detected in the rotational speed detection step S142. If the rotational speed of the input shaft 20 is R3 in the rotational speed comparison step S143, the synchronization end step S144 is executed. In the synchronization end step S144, the sleeve 411 corresponding to the first gear is controlled by moving the actuator 421 from the synchronization position to the neutral position. When the rotational speed of the input shaft 20 detected in the rotational speed detection step S142 has not reached the rotational speed of the next gear stage, the process is repeated from the synchronous gear stage synchronization step S141 until the rotational speed is reached. In the shift step S130, when the synchronization step S140 is completed, the sleeve 412 corresponding to the third speed of the next shift stage is moved from the standby position to the engaged position.

  Here, FIG. 6 is a timing chart showing the relationship among the rotational speed of the input shaft 20, the shift stroke of the synchronous gear, and the shift stroke of the next gear. The shift step S130 and the synchronization step S140 are executed at the time T1, and the rotation speed of the input shaft 20 has reached R3 at the time T2, so that the synchronization of the synchronous shift stage is ended at the synchronization end step S144. In synchronization step S130, the sleeve 412 moves from the standby position at time T2, and is positioned at the engagement position where it engages with the third gear at time T3.

(effect)
According to the transmission 11 and the transmission control method of the first embodiment, the speed change mechanism 3 is a synchronization device that supports synchronous gear speeds (first speed, fifth speed), which are some of the gear speeds. 371 and 375, and not equipped with a synchronizer at every shift stage. While the sleeve 411 to 413 corresponding to the next shift speed is moved from the neutral position to the standby position in the speed change means 51 and is on standby (speed change step S130), the synchronization means 52 sets the sleeve 411 corresponding to the synchronous speed change stage. The actuator 421 corresponding to the sleeve 411 is controlled so as to move from the neutral position to the synchronization position (synchronization step S140). That is, when the next gear stage is not provided with the synchronization device, the rotation synchronization with the input shaft 20 is performed using the synchronization devices 371 and 375 corresponding to the synchronization gear speed. When the next gear stage is a synchronous gear stage, rotation synchronization with the input shaft 20 is performed using the corresponding synchronizers 371 and 375. When the next gear is a synchronous gear, rotation synchronization with the input shaft 20 is performed using synchronization devices 371 and 375 corresponding to other synchronous gears. Therefore, synchronization can be performed by the synchronization devices 371 and 375 arranged in the synchronous gears without arranging the same number of synchronization devices as all the gears. Therefore, the number of synchronizers can be reduced and costs can be reduced. Further, as the number of synchronization devices decreases, the total length of the transmission in the input shaft direction is shortened, and the transmission can be downsized.

  Further, the control means 5 is provided with a rotation speed detection means 53 for detecting the rotation speed of the input shaft 20. Then, in the synchronizing means 52, when the rotational speed of the input shaft detected by the rotational speed detecting means 53 coincides with the rotational speed of the next shift speed, it corresponds to the synchronous speed shift stage in order to end the synchronization action in the synchronous shift speed. The sleeve 411 to be moved is moved to the neutral position (synchronization end step S114). Therefore, when the input shaft synchronizes with the next gear, the synchronization at the synchronous gear can be finished with good timing.

  Further, the rotation speed of the next gear stage is compared with the rotation speed of the input shaft 20, and the gear ratio is larger than the gear ratio of the next gear stage depending on the magnitude relationship between the rotation speed of the input shaft 20 and the rotation speed of the next gear stage. Since the control means 5 is provided with the synchronous speed stage selecting means 54 for selecting a small synchronous speed stage, the synchronization by the synchronizer corresponding to the appropriate speed ratio can be achieved for each speed stage.

  The first gear and the fifth gear can be synchronized with their own synchronizing device by changing the first gear with the largest gear ratio and the fifth gear with the smallest gear ratio out of the gears. Since the speed gear can be synchronized with either gear, the number of synchronizers can be reduced most. Further, the first speed and the fifth speed are made to correspond by the same sleeve 411 and the actuator 421, and are separated from the sleeves 412 and 413 and the actuators 422 and 423 corresponding to the second speed to the fourth speed. Since one of the sleeves 411 to 413 is disposed between the two gears, the sleeves 412 and 413 corresponding to the second to fourth gears are placed in one neutral position when shifting from the second gear to the fourth gear. If it is moved from the neutral position to the engagement position, it cannot be moved from the other neutral position to the synchronization position or the engagement position. Therefore, by arranging the shift stage so that the sleeve 411 corresponding to the first speed and the fifth speed is changed to the sleeve 411 other than the sleeves 412 and 413 corresponding to the second speed to the fourth speed, it is ensured even in the second speed to the fourth speed. Synchronization can be performed with a 1-speed or 5-speed synchronizer.

(Embodiment 2)
As shown in FIG. 8, the transmission 12 of the second embodiment includes a first clutch C1, a second clutch C2, a first input shaft 21, a second input shaft 22, an output shaft 23, a first clutch, The first speed change mechanism 71, the second speed change mechanism 72, the first speed change stage selection means 81, the second speed change stage selection means 82, and the control means 5 are provided.

  The first clutch C1 is located between an internal combustion engine output shaft 24 of an internal combustion engine (engine, not shown) as a power source and a first input shaft 21 described later, and outputs torque of the internal combustion engine to the first input shaft 21. It is a device that intermittently determines whether or not to transmit to the side. A case where the output torque from the internal combustion engine is transmitted to the first input shaft 21 is a connected state, and a case where the output torque from the internal combustion engine is not transmitted to the first input shaft 21 is a disconnected state.

  The second clutch C2 is located between the internal combustion engine output shaft 24 and a second input shaft 22 described later. And it is an apparatus which performs the interruption of whether the output torque of an internal combustion engine is transmitted to the 2nd input shaft 22 side. A case where the output torque from the internal combustion engine is transmitted to the second input shaft 22 is a connected state, and a case where the output torque from the internal combustion engine is not transmitted to the second input shaft 22 is a disconnected state.

  The first input shaft 21 is a member that is connected to the first clutch C1 and transmits rotational torque. The second input shaft 22 is a cylindrical member that is connected to the second clutch C <b> 2 to transmit rotational torque, is coaxial with the first input shaft 21, and is positioned on the outer peripheral side of the first input shaft 21.

  The output shaft 23 is coaxially arranged in the axial direction of the first and second input shafts 21 and 22, and outputs output torque transmitted through first and second transmission mechanisms 71 and 72 described later to wheels (not shown). It is a member that outputs to the side.

  The first speed change mechanism 71 includes first, third, fifth and seventh speed gears and synchronizers 381 and 382 provided to transmit torque between the first input shaft 21 and the output shaft 23. Have Each shift stage includes transmission gears 711 to 713 and a driven gear 714 that are rotatably held on the outer peripheral side of the first input shaft 21, a counter gear 62, and a counter shaft drive gear 65. The counter gear 62 is a gear corresponding to the transmission gear gears 711 to 713 and is fixed to a counter shaft 61 arranged in parallel with the first input shaft 21 so as to be rotatable integrally with the counter shaft 61. The counter shaft drive gear 65 is a gear that is coaxial with the counter gear 62, is fixed to the counter shaft 61 so as to be integrally rotatable, and meshes with the driven gear 714. Torque from the internal combustion engine is transmitted from a counter shaft side drive gear 65 disposed coaxially with the counter gear 62 to a driven gear 714 fixed to the output shaft 23 so as to be integrally rotatable. In the transmission 12 according to the second embodiment, the fifth shift speed is directly connected to the first input shaft 21 and the output shaft 23 without the counter gear 62 being interposed. The first gear is the transmission gear 711, the third gear is the transmission gear 712, and the seventh gear is the transmission gear 713. The first gear, the seventh speed, the third speed, and the fifth speed (driven gear 714) are arranged in this order from the first clutch C1 side toward the output shaft 23 side. The synchronization device 381 is located between the first-speed transmission gear 711 and a sleeve 414 described later. The synchronization device 382 is located between the seventh-speed transmission gear 713 and the sleeve 414. The shift speeds used as the synchronous shift speed in the first transmission mechanism 81 of the first input shaft 21 are the first speed and the seventh speed where the synchronizers 381 and 382 are arranged. The synchronizers 381 and 382 rotate relative to each other between the first input shaft 21 and the synchronous gears (first gear and seventh gear) by the friction engagement between the first input shaft 21 and the synchronous gear (the seventh gear) when the sleeve 414 is pressed from the synchronized position toward the engaged position. It is a device that reduces the number.

  The second speed change mechanism 72 includes a second speed, a fourth speed, a sixth speed, and a reverse (reverse) speed stage provided to transmit torque between the second input shaft 22 and the output shaft 23, and a synchronization device 391. 392. Each shift stage includes transmission gears 721 to 724 that are rotatably supported on the outer peripheral side of the second input shaft 22, and counter gears 62 that are fixed to the counter shaft 61 so as to be integrally rotatable and correspond to the gears 721 to 724. Become. Torque from the internal combustion engine is transmitted from a counter shaft side drive gear 65 arranged coaxially with the counter gear 62 to a driven gear 714 fixed to the output shaft 23 so as to be integrally rotatable. The second gear is the transmission gear 721, the fourth gear is the transmission gear 722, the sixth gear is the transmission gear 723, and the reverse gear is the transmission gear 724. From the second clutch C2 side toward the output shaft 23 side, they are arranged in the order of 2nd speed, 6th speed, 4th speed, and reverse. The synchronization device 391 is located between the second speed transmission gear 721 and a sleeve 416 described later. The synchronizer 392 is located between the sixth speed gear 723 and the sleeve 416. That is, the shift speeds used as the synchronous shift speed in the second transmission mechanism 82 of the second input shaft 22 are the second speed and the sixth speed where the synchronizers 391 and 392 are disposed. The synchronizers 391 and 392 rotate relative to each other between the second input shaft 22 and the synchronous gears (second gear and sixth gear) by the frictional engagement between the second input shaft 22 and the synchronous gears (second gear, sixth gear) when the sleeve 416 presses from the synchronization position toward the engagement position. It is a device that reduces the number.

  The reverse has an idler gear 63 between the transmission gear 724 and the counter gear 62. The idler gear 63 is held by an idler gear shaft 64 that is fixed in parallel to the first input shaft 21, the second input shaft 22, and the counter shaft 61 so as not to rotate, and is movable in the axial direction. When reverse is selected as the gear position, the idler gear 63 moves so as to mesh with both the transmission gear 724 and the counter gear 62, whereby the rotation of the second input shaft 22 is transmitted to the reverse transmission gear 724, and the idler gear 63 is Then, the counter gear 62 rotates and the counter shaft 61 rotates.

  The first gear selection means 81 includes sleeves 414 and 415, actuators 424 and 425, forks 434 and 435, and fork shafts 444 and 445. The sleeves 414 and 415 are cylindrical members and are positioned between the two gears so as to be integrally rotatable with the first input shaft 21 on the outer peripheral side of the first input shaft 21. In the second embodiment, the sleeve 414 is disposed between the first speed gear 711 and the seventh speed gear 713, and the sleeve 415 is disposed between the third speed gear 712 and the driven gear 714. The sleeves 414 and 415 have a neutral position that is not engaged with any of the shift stages and an engagement position that engages with the shift stage, and move between the neutral position and the engagement position in the axial direction. The sleeve 411 has a synchronization position frictionally engaged with the synchronization device 381 or the synchronization device 382 between the neutral position and the engagement position. The sleeve 415 has a standby position between the neutral position and the engagement position. The actuators 424 and 425 are power sources for moving the sleeves 414 and 415 between the neutral position and the engagement position via the forks 434 and 435 and the fork shafts 444 and 445. The forks 434 and 435 are located on the outer peripheral side of the sleeves 414 and 415 so that the sleeves 414 and 415 can move while rotating between the two gear positions (between the neutral position and the engagement position). The sleeves 414 and 415 are engaged. The fork shafts 444 and 445 are members that are integrally engaged with the forks 434 and 435.

  The second gear selection means 82 includes sleeves 416 and 417, actuators 426 and 426, forks 436 and 437, and fork shafts 446 and 447. The sleeves 416 and 417 are cylindrical members and are positioned between the two transmission gears so as to be integrally rotatable with the second input shaft 22 on the outer peripheral side of the second input shaft 22. In the second embodiment, the sleeve 416 is disposed between the second speed gear 721 and the sixth speed gear 723, and the sleeve 417 is disposed between the fourth speed gear 722 and the reverse 724. The sleeves 416 and 417 have a neutral position that is not engaged with any of the shift speeds and an engagement position that is engaged with the shift speed, and move between the neutral position and the engagement position in the axial direction. The sleeve 416 has a synchronization position in frictional engagement with the synchronization device 391 or the synchronization device 392 between the neutral position and the engagement position. The sleeve 417 has a standby position between the neutral position and the engagement position. The sleeve 417 does not move from the neutral position to the reverse transmission gear 724 side. The actuators 426 and 426 are power sources for moving the sleeves 416 and 417 between the neutral position and the engagement position via the forks 436 and 437 and the fork shafts 446 and 447. The forks 436 and 437 are located on the outer peripheral side of the sleeves 416 and 417 so that the sleeves 416 and 417 can move while rotating between the two gear positions (between the neutral position and the engagement position). The sleeves 416 and 417 are engaged. The fork shafts 446 and 447 are members that are integrally engaged with the forks 436 and 437.

  The control means 5 used in the second embodiment has basically the same configuration and operational effects as the control means 5 used in the first embodiment. The following description will focus on the different parts.

  The control unit 5 includes a transmission unit 51, a synchronization unit 55, a rotation speed detection unit 53, and a synchronization shift stage selection unit 56, and the synchronization unit 55 and the synchronization shift stage selection unit 56 are in a relationship including two clutches C1 and C2. Is different from the first embodiment.

  The synchronizing means 55 selects one of the synchronous gear speeds of the same speed change mechanism as the next gear speed while the sleeves 415 and 417 corresponding to the next gear speed are waiting at the standby position in the speed changing means 51. Then, the corresponding actuators 424 and 426 are controlled so that the sleeves 414 and 416 corresponding to the synchronous shift stage are moved to the synchronous position. In a transmission having two input shafts, such as the transmission 12, there is a transmission mechanism corresponding to one input shaft and the other input shaft. Therefore, the synchronous gear is selected from the gears of the transmission mechanism arranged on the same input shaft as the next gear, and the actuator corresponding to the gear is controlled. In the transmission 12 according to the second embodiment, when the shift stage of the first transmission mechanism 81 on the first input shaft 21 side is the next shift stage, the first or seventh speed is selected as the synchronous shift stage, and the second input shaft When the shift stage of the second transmission mechanism 82 on the 22nd side is the next shift stage, the second gear or the sixth gear is selected as the synchronous gear. The control means 5 and the following three control contents of the synchronization means 55 can be considered, and the transmission 12 that controls only one of them or the transmission 12 that is controlled in combination can be used. (1) When the next shift stage does not have a corresponding synchronization device, one of the same shift mechanisms of the same speed change mechanism as the next shift stage is selected, and the relative relationship between the input shaft 21 and the next shift stage is selected. The sleeve corresponding to the selected synchronous gear position is moved to the synchronous position until the rotational speed becomes equal to or less than the predetermined value. (2) When the next gear is a synchronous gear, select itself as the synchronous gear, and until the relative rotational speed between the input shaft 21 and the next gear (synchronous gear) becomes a predetermined value or less. The sleeve corresponding to the selected synchronous gear position is moved to the synchronous position. (3) When the next gear stage is a synchronous gear stage, another synchronous gear stage of the same transmission mechanism is selected, and the relative rotational speed between the input shaft 21 and the next gear stage (synchronous gear stage) is The sleeve corresponding to the selected synchronous shift speed is moved to the synchronous position until the predetermined value or less is reached, or the sleeve corresponding to the selected synchronous shift speed until the input shaft 21 and the next shift speed are in synchronization with rotation. Move to the synchronization position.

  Then, the synchronous shift speed selection means 56 compares the rotation speed of the next shift speed with the rotation speed of the first input shaft 21 or the second input shaft 22. When the rotation speed of the next shift stage is large, the synchronous shift stage is the shift stage of the transmission mechanism of the next shift stage, and a shift stage having a gear ratio larger than the speed ratio of the next shift stage is selected. Alternatively, when the rotational speed of the gear stage is small, the synchronous gear stage is the gear stage of the transmission mechanism of the next gear stage, and a gear stage having a gear ratio smaller than the gear ratio of the next gear stage is selected. In the transmission 12 according to the second embodiment, in the first transmission mechanism 81 corresponding to the first input shaft 21, the gear stage in which the gear ratio is larger than the gear ratio of the next gear stage among the first speed and the seventh speed of the synchronous gear stage. The first speed is selected when selecting, and the seventh speed is selected when selecting a small gear. In the second speed change mechanism 82 corresponding to the second input shaft 22, the second speed and the second speed are small when selecting a speed stage in which the speed ratio is larger than the speed ratio of the next speed stage among the second speed and the sixth speed of the synchronous speed stage. Sixth speed is selected when selecting a gear position.

  The rotational speeds of the first and second input shafts 21 and 22 are obtained by the sensors 531 and 532 of the rotational speed detection means 53. The sensor 531 detects the rotational speed of the first input shaft 21, and the sensor 532 detects the rotational speed of the second input shaft 22.

  The transmission 12 of the second embodiment is controlled by the control means 5 based on the transmission control method of the present invention. A typical flowchart of the transmission control method is shown in FIGS. 2 to 4 are flowcharts showing an example of the logic of the control method, and the present invention is not limited to this. 2 to 4 are also used as a flowchart showing a control method of the transmission used in the transmission 11 of the first embodiment, and the symbol in parentheses corresponds to the second embodiment.

  The control means 5 detects the rotational speeds of the first and second input shafts 21 and 22 by the rotational speed detection means 53 (rotational speed detection step S210). Next, the synchronous gear stage selection means 56 compares the rotational speed of the next gear stage with the rotational speed of the input shaft detected in the rotational speed detection step S210, and selects the synchronous gear stage based on the comparison result (synchronous gear stage). Selection step S220).

  In the synchronous shift speed selection step S220, the next shift speed is compared with the rotation speed of one input shaft corresponding to the next shift speed (rotation speed comparison step S221). When the rotational speed of the input shaft is small, the gear position of the gear mechanism of the next gear stage and the gear ratio that is larger than the gear ratio of the next gear stage is selected as the synchronous gear stage (selection of large synchronous gear ratio). Step S223). Alternatively, when the number of rotations of the next gear stage is large, the gear stage of the gear mechanism of the next gear stage and having a gear ratio smaller than the gear ratio of the next gear stage is selected as the synchronous gear stage (the synchronous gear ratio is small). Selection step S223).

  Next, the transmission means 51 selects the sleeves 414 to 417 corresponding to the next shift speed, controls the actuators 424 to 426 corresponding to the sleeves 414 to 417, and moves the sleeves 414 to 417 to the shift gear side of the next shift speed. Move to the standby position (shift step S230). Simultaneously with the speed change step S230, the synchronizing means 55 moves the sleeves 414 to 417 corresponding to the synchronous speed stage to the actuators 424 to 426 corresponding to the sleeves 414 to 417 to move them to the synchronous position (synchronization step S240). In the synchronization step S240, the actuators 424 to 426 are controlled to move the sleeves 414 to 417 corresponding to the synchronization shift stage to the synchronization position (synchronous shift stage synchronization step S241). The rotational speed of the second input shafts 21 and 22 is detected (rotational speed detection step S242). Then, the rotational speed of the next gear stage is compared with the rotational speed of one of the input shafts corresponding to the next gear stage (rotational speed comparison step S243). If the rotational speed of the input shaft is not equal to the rotational speed of the next gear stage, the process is repeated from the synchronous gear stage synchronization step S241. If the rotational speeds are equal, the actuator 42 is controlled to move the sleeve 41 corresponding to the synchronous gear position from the synchronous position to the neutral position (synchronization end step S244). In the rotation speed comparison step S243, the rotation speed of the input shaft 20 is compared with the rotation speed of the next gear, and if they are equal, the synchronization of the synchronous gear is completed. The rotation speed close to the rotation speed of the shift speed, that is, the relative rotation speed between the next shift speed and the input shaft may have a predetermined width.

  In the shift step S230, when the synchronization step S240 is completed, the sleeves 414 to 417 corresponding to the next shift stage are moved from the standby position to the engaged position.

  The flow controlled by the transmission 12 according to the second embodiment according to the transmission control method is, for example, when shifting to the third speed while traveling at the second speed of the shift speed and shifting to the fourth speed while traveling at the fifth speed. The case where it does is demonstrated.

(2nd to 3rd gear)
First, the rotational speed of the first and second input shafts 21 and 22 is detected in the rotational speed detection step S210. Next, in the synchronous shift speed detection step S220, the rotation speed R3 of the third speed of the next shift speed is compared with the rotation speed Rin of the first input shaft 21. Here, the third gear is a gear on the first input shaft 21, but before the gear becomes the second gear, the first input shaft 21 is the first gear of the gear on the first input 21 shaft. If the gear is rotating at the first speed, considering the speed of the shift, which is an advantage of the dual clutch, it is considered that the third speed is prepared immediately after the first gear is disengaged. When the second speed and the third speed are quickly switched, Rin> R3. Therefore, when the rotation speed Rin of the first input shaft 21 is compared with the rotation speed R3 of the third speed, the rotation speed of the first input shaft 21 is large, so that the synchronous gear ratio small selection step S223 is executed. In the synchronous gear ratio small selection step S223, the seventh gear speed, which is the gear speed of the first gear mechanism 81 of the next gear speed 3 speed, and whose gear ratio is smaller than the gear ratio of the next gear speed 3 speed is set as the synchronous gear speed. Selected. In step S230, the sleeve 415 corresponding to the third gear is selected, the corresponding actuator 425 is controlled, and the sleeve 415 is moved to the standby position on the third gear 712 side. While the sleeve 415 is waiting at the standby position in the shift step S230, the synchronization step S240 is executed. In the synchronous gear shift step S241, the sleeve 414 corresponding to the seventh gear is selected, the corresponding actuator 424 is controlled, and the sleeve 414 is moved to the synchronous position on the seventh gear 713 side. Then, after a predetermined time, the rotational speed of the first and second input shafts 21 and 22 is detected in the rotational speed detection step S242, and if the rotational speed of the second input shaft 22 is R3 in the rotational speed comparison step S243, the synchronization is performed. The end step S244 is executed. In the synchronization end step S244, the sleeve 414 corresponding to the seventh gear is controlled by the synchronization means 55 to move the actuator 424 from the synchronization position to the neutral position. If the rotational speed of the first input shaft 21 detected in the rotational speed detection step S242 has not reached the rotational speed of the next gear stage 4th speed, the process is repeated from the synchronous gear stage synchronization step S241 until the rotational speed is reached.

  FIG. 8 is a timing chart showing the relationship between the rotation speed of the first input shaft 21, the shift speed of the synchronous gear (7th gear), and the shift stroke of the third gear of the next gear. The shift stroke of the gear stage is displayed in correspondence with the positions of the sleeves 414 and 415. The shift step S230 and the synchronization step S240 are executed at the time T1, and the rotation speed of the first input shaft 21 has reached R3 at the time T2, so that the synchronization of the synchronous shift stage is ended in the synchronization end step S244. In the shift step S230, the sleeve 414 moves from the standby position at time T2, and is positioned at the engagement position where it engages with the third gear at time T3.

(5-speed to 4-speed)
In the rotational speed detection step S210, the rotational speeds of the first and second input shafts 21 and 22 are detected. Next, in the synchronous shift speed detection step S220, the rotation speed of the next shift speed 4th speed is compared with the rotation speed of the second input shaft 22. Here, the fourth speed is the speed on the second input shaft 22, but before the speed becomes the fifth speed, the second input shaft 22 is the sixth speed of the speed on the second input 22 shaft. If the gear is rotating at a speed of 4, the speed of shifting, which is an advantage of the dual clutch, is considered, and it is considered that preparation of the fourth speed is made immediately after the engagement of the sixth speed is disengaged. Therefore, Rin <R4 is set when the gear speed is rapidly switched between the sixth speed, the fifth speed, and the fourth speed. Therefore, when the rotation speed Rin of the second input shaft 22 is compared with the rotation speed R4 of the fourth speed, the rotation speed of the second input shaft 22 is small, so the synchronous gear ratio large selection step S222 is executed. In the synchronous gear ratio large selection step S222, the second gear, which is the gear position of the second gear mechanism 82 having the next gear speed of four speeds and has a gear ratio larger than the gear ratio of the fourth speed, is selected as the synchronous gear speed. Next, in the shift step S230, the sleeve 417 corresponding to the fourth speed is selected, the corresponding actuator 427 is controlled, and the sleeve 417 is moved to the standby position. While the sleeve 417 is waiting at the standby position in the shift step S230, the synchronization step S240 is executed. In the synchronous gear shift step S241 of the synchronous step S240, the sleeve 416 corresponding to the second gear is selected, the corresponding actuator 426 is controlled, and the sleeve 416 is moved to the synchronous position on the second gear 721 side. Let Then, after a predetermined time, the rotational speed of the first and second input shafts 21 and 22 is detected in the rotational speed detection step S242, and if the rotational speed of the second input shaft 22 is R4 in the rotational speed comparison step S243, synchronization is performed. The end step S244 is executed. In the synchronization end step S244, the sleeve 416 corresponding to the second gear is controlled by the actuator 426 and moved from the synchronization position to the neutral position. When the rotation speed of the second input shaft 22 detected in the rotation speed detection step S242 does not reach the rotation speed of the fourth speed, the process is repeated from the synchronous gear position synchronization step S241 until the rotation speed is reached.

  Here, FIG. 9 is a timing chart showing the relationship between the rotational speed of the second input shaft 22, the second speed shift stroke, and the fourth speed shift stroke. Since the speed change step S230 and the synchronization step S240 are executed at time T1, and the rotation speed of the input shaft 20 reaches R4 at time T2, the synchronization of the synchronous shift speed is ended at the synchronization end step S244. In the shift step S230, the sleeve 417 moves from the standby position at time T2, and is positioned at the engagement position where it engages with the fourth gear at time T3.

(effect)
According to the transmission 11 and the transmission control method of the first embodiment, the first transmission mechanism 81 corresponds to the synchronous gears (first gear, seventh gear) which are some of the gears. Synchronizing devices 381 and 382 are provided, and the second speed change mechanism 82 is provided with synchronizing devices 391 and 392 corresponding to synchronous gears (second speed, sixth speed). That is, neither the first speed change mechanism 81 nor the second speed change mechanism 82 is provided with a synchronizer at every shift speed. For a gear stage that does not include a synchronizer, the gear means 51 moves the sleeves 415 and 417 corresponding to the next gear stage from the neutral position to the standby position (shift step S230). The actuators 424 and 426 are controlled so as to move the sleeves 414 and 416 corresponding to the synchronous gear position from the neutral position to the synchronous position (synchronization step S240). That is, the next shift stage performs rotation synchronization with the first input shaft 21 or the second input shaft 22 using the synchronization devices 381, 382, 391, 392 corresponding to the synchronous shift stage. Therefore, the synchronization can be performed by the synchronization devices arranged at the synchronous gears without arranging the same number of synchronization devices as all the gears. Therefore, the number of synchronizers can be reduced and costs can be reduced. Further, as the number of synchronization devices decreases, the total length of the transmission in the input shaft direction is shortened, and the transmission can be downsized.

  Further, the control means 5 is provided with a rotation speed detection means 53 for detecting the rotation speed of the input shaft 20. Then, in the synchronizing means 55, when the rotational speed of the input shaft detected by the rotational speed detecting means 53 coincides with the rotational speed of the next gear, the sleeve 414 corresponding to the synchronous gear is set so as not to synchronize at the synchronous gear. 416 is moved to the neutral position (synchronization end step S114). Accordingly, it is possible to detect that the input shaft is synchronized with the next shift speed, and synchronization at the synchronous shift speed can be completed with good timing.

  Further, the rotational speed of the next gear stage is compared with the rotational speed of the first or second input shaft 21 or 22, and the magnitude relationship between the rotational speed of the first or second input shaft 21 or 22 and the rotational speed of the next gear stage. Therefore, the control means 5 is provided with the synchronous gear stage selection means 56 for selecting a synchronous gear stage having a gear ratio larger or smaller than the gear ratio of the next gear stage. Synchronization by the device can be achieved.

  Of the gears on the first input shaft 21, the first gear with the largest gear ratio and the seventh gear with the smallest gear ratio are set as synchronous gears, and the gear with the largest gear ratio among the gears on the second input shaft 22 is used. By setting the 2nd speed and the minimum 6th speed as the synchronous speed, the synchronous speed can be synchronized with its own synchronizer, and the remaining speed is synchronized with either speed for each input shaft. Can respond. Therefore, the number of synchronization devices can be reduced most. Further, the first speed and the seventh speed and the second speed and the sixth speed correspond to the same sleeves 414 and 416 and the actuators 424 and 426, respectively, and are separated from the sleeves 415 and 417 corresponding to the third speed to the fifth speed. Even when the sleeves 415 and 417 corresponding to the 3rd to 5th gears are moved from the neutral position to the engaged position at the time of shifting from the 3rd to 5th gears, the synchronous gears 414 and 416 are moved from the neutral position. It can be moved to the synchronization position. Therefore, by arranging the gears so that the sleeves 414 and 416 corresponding to the synchronous gears and the sleeves 415 and 417 corresponding to the gears 3 to 5 are different from each other, the gears are surely also in the third to fifth gears. Can be synchronized.

(Other embodiments)
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, the rotational speed of the input shaft is detected by a sensor (rotational speed detection means 53) attached to the input shaft, but the rotational speed of the output shaft 24 of the internal combustion engine may be used. In this case, the rotational speed of the internal combustion engine immediately after the clutch C is switched from the connected state to the disconnected state in order to switch the gear position is set as the rotational speed of the input shaft. Therefore, in the rotation speed detection step S242 of the synchronization step S240, the input shaft is not detected by the sensor, but the rotation speed of the input shaft after a predetermined time is predicted or calculated, or the synchronization end step S244 is executed after the predetermined time. Control can be considered.

It is explanatory drawing which shows the structure of the transmission 11 of this Embodiment 1. FIG. It is a flowchart figure which shows the control method of the transmission used with the transmission 11 of this Embodiment 1. FIG. It is a flowchart figure of synchronous gear stage selection step S120 (S220) shown in FIG. It is a flowchart figure of synchronous step S140 (S240) shown in FIG. Timing chart showing the relationship between the speed of the input shaft 20, the stroke of the synchronous gear stage, and the stroke of the next gear stage according to the transmission 11 of the first embodiment and its control method when the gear stage is switched from the second speed to the third speed. FIG. Timing chart showing the relationship between the rotation speed of the input shaft 20, the stroke of the synchronous gear stage, and the stroke of the next gear stage according to the transmission 11 of the first embodiment and its control method when the gear stage is switched from the fourth speed to the third speed. FIG. It is explanatory drawing which shows the structure of the transmission 12 of this Embodiment 2. FIG. When the gear position is switched from the second speed to the third speed, the rotational speed of the input shaft on which the next gear position according to the transmission 12 of the second embodiment and its control method is arranged, the stroke of the synchronous gear position, and the next gear position stroke It is a timing chart figure which shows the relationship. When the gear position is switched from the fifth speed to the fourth speed, the speed of the input shaft on which the next gear position according to the transmission 12 of the second embodiment and its control method is arranged, the stroke of the synchronous gear position, and the next gear position stroke It is a timing chart figure which shows the relationship.

Explanation of symbols

11, 12: Transmission,
20: input shaft, 21: first input shaft, 22: second input shaft, 23: output shaft,
24: Internal combustion engine output shaft 24,
3: Transmission mechanism, 31-33, 35, 36, 711-713
721-724: Transmission gear, 34,714: Driven gear,
371-375, 381, 382, 391, 392: synchronization device,
4: Shift speed selection means, 411-417: sleeve, 421-427: actuator,
431-437: fork, 441-447: fork shaft,
5: control means, 51: transmission means, 52, 55: synchronization means, 53: rotational speed detection means,
531, 532: Sensors, 54, 56: Synchronous gear selection means,
61: counter shaft, 62: counter gear, 63: idler gear, 64: idler gear shaft,
65: Counter shaft drive gear,
71: 1st speed change mechanism, 72: 2nd speed change mechanism, 81: 1st gear stage selection means,
82: Second gear selection means,
C: clutch, C1: first clutch, C2: second clutch.

Claims (10)

A clutch that is switchable by moving between a connected state connected to a power source and a disconnected state disconnected from the power source;
An input shaft connected to the clutch;
An output shaft;
A speed change mechanism having a plurality of speed stages provided between the input shaft and the output shaft;
A sleeve positioned between two of the plurality of gears, having a neutral position that is not engaged with any of the gears, and an engagement position that engages with one of the selected gears; A gear stage selection means having an actuator for moving a sleeve between the neutral position and the engagement position;
Control means for controlling the clutch and the actuator;
A transmission having
The speed change mechanism is provided corresponding to a synchronous speed that is a part of the speed, and the sleeve corresponding to the synchronous speed is between the neutral position and the engagement position. A synchronization device that reduces the relative rotational speed by friction engagement between the input shaft and the synchronous gear stage by pressing toward the engagement position from
The control means includes
Gear changing means for controlling the actuator corresponding to the sleeve so as to select the sleeve corresponding to the next gear speed to be switched and to move the sleeve from the neutral position to the engagement position;
One of the synchronous gears is selected, and the sleeve corresponding to the selected synchronous gear is moved to the synchronous position until the relative rotational speed between the input shaft and the next gear becomes a predetermined value or less. Synchronization means to move,
A transmission comprising: The control means includes rotation speed detection means for detecting the rotation speed of the input shaft,
The synchronizing means controls the actuator corresponding to the synchronous gear and moves the sleeve to the neutral position when the rotational speed detected by the rotational speed detector matches the rotational speed of the next gear. The transmission according to claim 1. The clutch includes a first clutch and a second clutch,
The input shaft includes a first input shaft connected to the first clutch and a second input shaft connected to the second clutch;
The synchronization means controls the actuator corresponding to the sleeve so as to move the sleeve corresponding to the synchronous shift speed provided on one of the input shafts of the next shift speed to the synchronous position. Item 1. The transmission according to item 1 or 2.   The control means compares the rotational speed of the next gear stage with the rotational speed of the input shaft, and when the rotational speed of the input shaft is small, the speed ratio is greater than the gear ratio of the next gear speed among the synchronous gear speeds. Synchronous shift stage selection means for selecting the large synchronous shift stage and selecting the synchronous shift stage having a gear ratio smaller than the gear ratio of the next shift stage among the synchronous shift stages when the rotational speed of the input shaft is large. The transmission according to any one of claims 1 to 3.   The transmission according to any one of claims 1 to 4, wherein the synchronous gear stage is a gear stage having a maximum and a minimum gear ratio among the gear stages on the same input shaft. A clutch that is switchable by moving between a connected state connected to a power source and a disconnected state disconnected from the power source;
An input shaft connected to the clutch;
An output shaft;
A speed change mechanism having a plurality of speed stages provided between the input shaft and the output shaft;
A sleeve positioned between two of the plurality of gears, having a neutral position that is not engaged with any of the gears, and an engagement position that engages with one of the selected gears; A gear selection means having a number of actuators corresponding to the sleeve for moving the sleeve between the neutral position and the engagement position;
Control means for controlling the clutch and the actuator;
A transmission control method used for a transmission of a vehicle having
The speed change mechanism is provided corresponding to a synchronous speed that is a part of the speed, and the sleeve corresponding to the synchronous speed is between the neutral position and the engagement position. A synchronization device that reduces the relative rotational speed by friction engagement between the input shaft and the synchronous gear stage by pressing toward the engagement position from
A shift step of controlling the actuator corresponding to the sleeve so as to select the sleeve corresponding to the next shift speed which is a shift speed to be switched, and to move the sleeve from the neutral position to the engagement position;
One of the synchronous gears is selected, and the sleeve corresponding to the selected synchronous gear is moved to the synchronous position until the relative rotational speed between the input shaft and the next gear becomes a predetermined value or less. A synchronization step to move,
A control method for a transmission comprising: A rotational speed detection step for detecting the rotational speed of the input shaft;
7. The synchronization step according to claim 6, wherein, when the rotation speed detected by the rotation speed detection step coincides with the rotation speed of the next shift stage, the actuator is controlled to move the sleeve to the neutral position. Transmission control method. The clutch includes a first clutch and a second clutch,
The input shaft includes a first input shaft connected to the first clutch and a second input shaft connected to the second clutch;
The synchronization step controls the actuator corresponding to the sleeve so as to move the sleeve corresponding to the synchronous gear provided on the one input shaft having the next gear to the synchronous position. Item 8. The transmission control method according to Item 6 or 7.   Comparing the number of rotations of the next gear to the number of rotations of the input shaft, the synchronous gear is larger in gear ratio than the gear ratio of the next gear among the synchronous gears when the number of rotations of the input shaft is small. When the rotational speed of the input shaft is large, a synchronous shift speed selection step is selected for selecting the synchronous shift speed having a speed ratio smaller than the speed ratio of the next shift speed among the synchronous shift speeds. The transmission control method according to any one of claims 8 to 9.   The transmission control method according to any one of claims 6 to 9, wherein the synchronous gear stage is a gear stage having a maximum and a minimum gear ratio among the gear stages on the same input shaft.

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