JP3011567B2 - Transmission control method and apparatus for transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control method and apparatus for a transmission, and more particularly, to a countershaft target for allowing a shift operation based on the number of gear teeth selected by the shift operation and the rotation speed of the output shaft. The rotational speed is calculated, and the two clutches provided on the side of the transmission are connected / disengaged to control the rotational speed of the countershaft so that the target rotational speed is approached before the gearshift operation is performed. The present invention relates to a speed change control method and apparatus for a speed change device capable of performing speed change in a short time.

[0002]

2. Description of the Related Art Conventionally, when shifting a gear of a transmission of a vehicle, a shift operation is performed after a clutch is operated to disconnect the transmission from an engine. An automatic transmission that automatically changes the speed of the manual transmission using an actuator that uses a fluid pressure cylinder is adopted.The use of a torque converter eliminates the need for a torque converter, dramatically improving driving efficiency while improving fuel efficiency and reducing output loss. Improved transmissions have been put to practical use.

However, in this type of automatic transmission, a mechanical clutch is mainly used, and in this type of clutch, the clutch must be connected and disconnected every time a gearshift operation is performed. .

Therefore, when the clutch is disengaged prior to the gear shifting operation, the rotating members below the clutch disk rotate by inertia due to their inertia. Therefore, the input shaft, the input gear, the counter gear, the counter shaft, and the input shaft are fixed to the counter shaft. The main gears for speed change both coast.

If the clutch is not completely disengaged, a so-called clutch drag occurs. In this case, however, the countershaft and the like continue to rotate at a certain speed against the driver's will.

[0006] On the other hand, in order to smoothly perform gear shifting and gear shifting of the transmission, it is necessary to perform a speed change operation in a state where the rotation speeds of the output shaft and the main gear are synchronized.

That is, when the gear is upshifted, the rotation speed of the next connected main gear is always higher than the rotation speed of the output shaft, so it is necessary to reduce the rotation speed of the main gear prior to shifting. At the time of gear downshifting, the rotational speed of the next connected main gear is always lower than the rotational speed of the output shaft, so it is necessary to increase the rotational speed of the main gear prior to shifting.

Conventionally, in order to reduce or increase the rotational speed of the main gear, a double clutch operation is conventionally performed, or the conical inner diameter of the synchronizer ring is brought into contact with the conical portion of the main gear, and the frictional force of the conical portion causes the main gear to rotate. After synchronizing the rotation speed with the rotation speed of the output shaft, the gear shifting operation is performed using a so-called synchromesh mechanism for meshing the gears.

However, according to the conventional synchronization method and apparatus,
It takes a long time to synchronize the rotation speed of the main gear with the rotation speed of the output shaft, which may result in a shift at a timing slightly different from the driver's will.Therefore, there is room for improvement in ensuring light driving performance. there were. Also open
61-179445 discloses an electric shift operation device for a vehicle.
Is disclosed, but in the conventional example, a shift stage of the same gear train is used.
Gear shift to the synchronization of
It reduces the speed, but cannot increase the speed of the counter shaft.
No. And the effect of the invention of the conventional example is when starting or stopping.
Gears down to low gear when accelerating in close driving conditions
It is effective only when the effect is very limited.
It's just Therefore, the conventional example is different from the present invention in its structure.
Are completely different, and the effects are different
It is. In addition, in Japanese Utility Model Application
Although a control device for a multi-stage transmission with a switch is disclosed,
The example shows two countershafts for odd and even gears.
A multi-stage transmission with a shaft, the optimum gear stage of which is 2
It is an invention of a control device for making a selection including a shift in a step jump.
Therefore, this is a different invention that has no relation to the present invention.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and has as its object to provide an output driven by a synchro gear fixed to an output shaft. A first clutch for connecting or disconnecting the transmission gear and the synchro shaft and a second clutch for connecting or disconnecting the synchro shaft and the case of the transmission, and operating the first clutch when downshifting the gear. The rotation speed of the synchro shaft is increased, and the second clutch is operated when the gear is upshifted, so that the rotation speed of the synchro shaft is reduced. By increasing or decreasing the speed of the shaft, the main gear and output And that to be able to synchronize the rotational speed of the shift and thereby is to ensure a nimble operation performance to be able to perform the gear shift operation to the will by a driver.

Another object of the present invention is to provide a target rotation speed of a countershaft that permits a gearshift operation based on the number of gear teeth to be shifted and the current rotation speed of the output shaft, the target rotation speed and the current rotation speed of the countershaft. And calculating the permissible range of the rotational speed difference from the above, and when the difference in the rotational speed falls within the permissible range, the transmission is made to perform a speed change operation. The purpose is to enable a smooth shifting operation to be performed.

Still another object is to set an allowable range of the rotational speed difference to an optimum value predetermined in advance from the rate of change of the rotational speed difference with respect to time and the temperature of the transmission oil for each acceleration pattern or deceleration pattern of the countershaft. By using the control, it is possible to always perform a smooth shift operation in both the up-shifting and down-shifting operations.

[0013]

In summary, the method of the present invention (claim 1) comprises: a first clutch for connecting or disconnecting a counter shaft and an output shaft to accelerate the rotation of the counter shaft; A second clutch that connects or disconnects a case of a transmission to reduce or reduce the rotation of the counter shaft, and that allows a shift operation based on the number of gear teeth to be shifted and the current rotation speed of the output shaft. Calculate the target rotation speed of the counter shaft, and when the current rotation speed of the counter shaft is smaller than the target rotation speed, actuate the first clutch to accelerate the rotation of the counter shaft. When the rotation speed is higher than the target rotation speed, the second clutch is operated to reduce the rotation of the counter shaft. So, the difference between the current rotational speed of the counter shaft and the target rotational speed is characterized in that to perform the shifting operation of the transmission device when it becomes smaller than a predetermined value.

The present invention also provides a first clutch for connecting or disconnecting the counter shaft and the output shaft, and a second clutch for connecting or disconnecting the counter shaft and the case of the transmission. An output shaft rotation speed detecting device for detecting the rotation speed of the output shaft, a counter shaft rotation speed detecting device for detecting the rotation speed of the counter shaft, an oil temperature sensor for detecting the temperature of the transmission oil, and a speed change operation. A gear position sensor for detecting a transmission gear position, and a target rotation speed of the counter shaft for permitting the shift operation from the number of gear teeth selected by the shift operation and the rotation speed of the output shaft. The current rotational speed of the shaft is smaller than the target rotational speed. Sometimes, the first clutch is operated to accelerate the rotation of the countershaft, and when the current rotation speed is greater than the target rotation speed, the second clutch is operated to reduce the rotation of the countershaft. And a device.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 and 2, a shift control device 1 of a transmission according to the present invention includes a first clutch 5, a second clutch 6, an output shaft rotation speed detection device 50,
Counter shaft rotation number detecting device 51 and oil temperature sensor 5
2, a gear position sensor 53, and the computer 22 as an example of a control device.

The transmission control device 1 includes a first-speed main gear 9A and a reverse main gear 9 that are rotatably fitted to the rotation speed of the output shaft 8 and the output shaft 8.
B, for synchronizing the rotational speeds of the second-speed main gear 9C, the third-speed main gear 9D, or the fourth-speed main gear 9E.
It is attached to.

First, a description will be given of the structure of a constant mesh gear type transmission 10 with a synchronizing device. A clutch 14 of a hydraulic crimping type or the like is arranged between a crankshaft 12 and an input shaft 13 of an engine (not shown). The crankshaft 12 and the input shaft 13 are connected and disconnected.

An input gear 15 fixed to the input shaft 13 meshes with a counter gear 18 fixed to the counter shaft 16, and transmits the rotation of the input shaft 13 to the counter shaft 16.

On the counter shaft 16, a first-speed counter gear 19A, a reverse-speed counter gear 19B, a second-speed counter gear 19C, a third-speed counter gear 19D and a fourth-speed counter gear 19E are fixed. Main gear 9A, reverse main gear 9B, second speed main gear 9C,
The third speed main gear 9D and the fourth speed main gear 9E are engaged with each other.

Between the main gear 9A for the first speed and the main gear 9B for the reverse of the output shaft 8, between the main gear 9C for the second speed and the main gear 9D for the third speed, and between the main gear 9E for the fourth speed and the input gear 15 Shift forks 20A, 20B and 20C are provided, respectively, and a shift select unit 23 is operated by a command from a computer 22 by manually operating a shift lever 21 to shift the shift forks 20A, 20B or 2C.
Move the respective sleeves 17A, 17B or 17
Through C, the first-speed main gear 9A and the reverse main gear 9
The main shaft 9B for the second speed, the main gear 9D for the third speed, and the main gear 9E for the fourth speed are connected to the output shaft 8.

The synch gear 2 is for transmitting the rotation of the output shaft 8 to the output gear 4, and is fixed to the output shaft 8 so as to rotate together with the output shaft 8.

The synchro shaft 3 controls the rotation speed of the synchro shaft 3 so that the first speed main gear 9A, the reverse main gear 9B,
A case of the constant mesh gear type transmission 10 for increasing and decreasing the rotation speed of the second speed main gear 9C, the third speed main gear 9D or the fourth speed main gear 9E to synchronize with the rotation speed of the output shaft 8. 27 is rotatably supported by a ball bearing 22 .

A male spline is formed at an intermediate portion of the synchro shaft 3, and a female spline formed on the counter gear 25 is slidably fitted to the male spline.

The counter gear 25 is a main gear 9 for the second speed.
C, and is configured to transmit the rotation of the synchro shaft 3 to the counter shaft 16 via the second speed main gear 9C and the second speed counter gear 19C.

The output gear 4 is for transmitting the rotation of the output shaft 8 to a first clutch 5 described later, and is rotatably fitted to the synchro shaft 3 and meshes with the synchro gear 2. It is configured to be rotationally driven by the output shaft 8.

A ring-shaped projection 4a is provided on the side of the output gear 4, and is configured as a housing of the first clutch 5.

The first clutch 5 includes a first-speed main gear 9
A, reverse main gear 9B, second speed main gear 9C, 3
This is for increasing the rotation speed of the speed main gear 9D or the fourth speed main gear 9E. An intermediate ring (not shown) is slidably fitted to the synchro shaft 3 and spline-fitted so as to transmit the rotational force. are doing.

A plurality of shaft-side clutch plates 29 are slidably and spline-fitted to the outer peripheral portion of the intermediate ring.

A female spline is formed on the inner diameter of the ring-shaped projection 4a formed as a housing of the first clutch 5, and slides with a male spline (not shown) formed on the housing side clutch plate 30. The plurality of housing-side clutch plates 30 and the plurality of shaft-side clutch plates 29 are movably fitted, and are alternately arranged and housed in the housing.

A cylinder chamber (not shown) is provided opposite to the shaft side clutch plate 29 and the housing side clutch plate 30, and a first piston (not shown) is provided in the cylinder chamber in FIG. It is slidably fitted in the direction.

An O-ring (not shown) is attached to an inner / outer diameter fitting portion between the first piston and the cylinder chamber to maintain airtightness, and a compression spring (not shown) connects the first piston to the shaft side clutch. It is urged in a direction (rightward in FIG. 2) to be disengaged from the plate 29 and the housing side clutch plate 30.

Then, a compressed fluid is supplied from a compressed fluid supply source 56 to a compressed fluid supply port (not shown) provided in the case 27 via a fluid switching valve 58A, and the first piston is moved to the position shown in FIG.
, The shaft side clutch plate 29 and the housing side clutch plate 30 are brought into close contact with each other, and the rotational force of the output gear 4 is transmitted to the synchro shaft 3 by frictional force.

The second clutch 6 includes a first-speed main gear 9
A, reverse main gear 9B, second speed main gear 9C, 3
The first clutch 5 is provided for reducing the rotation speed of the speed main gear 9D or the fourth speed main gear 9E.
It is configured as substantially the same structure.

Fixed housing 4 fixed to case 27
0, a fixed clutch plate 41 is slidably fitted with a spline, and a male spline (not shown) formed continuously with the counter gear 25 is fitted with a female spline (not shown) of the shaft side clutch plate 42. ) Is slidably fixed clutch plate 41
Are alternately arranged and fitted.

A cylinder portion (not shown) is formed in the fixed housing 40 similarly to the cylinder chamber of the first clutch 5, and a second piston (not shown) has an O-ring (not shown) in the cylinder portion. (Not shown).

A compression spring (not shown) is mounted on the second piston, and is attached in a direction (leftward in FIG. 2) for detaching the second piston from the fixed clutch plate 41 and the shaft side clutch plate 42. I'm going.

Then, a compressed fluid is supplied from a compressed fluid supply source 56 to a compressed fluid supply port (not shown) provided in the case 27 via a fluid switching valve 58B, and the second piston is moved to the position shown in FIG.
, The fixed clutch plate 41 and the shaft-side clutch plate 42 are brought into close contact with each other, and a braking force is transmitted to the synchro shaft 3 by a frictional force.

Further, a lubricating oil supply hole is formed in each of the synchro shaft 3, the output gear 4, the counter gear 25, and the intermediate ring, and a lubricating oil supply device (not shown) is provided.
The lubricating oil is supplied to lubricate each part.

Output shaft rotation speed detecting device 50
Is for detecting the number of revolutions of the output shaft 8, and is used for detecting the constant mesh gear type transmission 1
This is a rotation speed detection device using, for example, a Hall element, which is disposed near the output shaft 8, and generates an electric pulse proportional to the rotation speed of the output shaft 8.

The counter shaft rotation speed detecting device 51
This is a device for detecting the number of revolutions of the counter shaft 16, and is a device for detecting the number of revolutions using, for example, a Hall element, disposed near the counter shaft 16. A target pulse is generated.

The oil temperature sensor 52 is for detecting the oil temperature of the transmission oil, and is, for example, a thermistor whose electric resistance changes in proportion to the temperature. It is arranged in a constant mesh gear type transmission 10.

The gear position sensor 53 is for detecting the position of the currently selected gear, and is, for example, a micro switch and is mounted on the shift select unit 23. Further, a lever position sensor 54 is provided on the shift lever 21 to detect the position of the shift lever 21 selected to shift.

Each of the above sensors is connected to a signal line 55A, 5A.
Shift by 5B, 55C, 55D and 55E
The select units 23 are each electrically connected to the computer 22 by a signal line 55F .

The computer 22, which is an example of the control device,
Various types of information are input from the output shaft rotation speed detection device 50, the counter shaft rotation speed detection device 51, the oil temperature sensor 52, the gear position sensor 53, the lever position sensor 54, and the like, and based on the information, the first clutch 5, It is a well-known computer device for optimally controlling the second clutch 6, the shift select unit 23, and the like, and includes a central processing unit 22a, an input / output port 22b, an external storage device 22c, and the like.

The present invention is configured as described above,
Hereinafter, the operation will be described. 1 to 3, when the vehicle is traveling at the first speed, for example, the gear shift fork 20A engages the sleeve 17A with the first speed main gear 9A, and the rotational force of the crankshaft 12 of the engine 11 is increased. Is transmitted to the input shaft 13 by the clutch 14.

Further, the input gear 15 and the counter gear 1
8, counter shaft 16, first speed counter gear 19
A, the rotational force is transmitted to the output shaft 8 via the first-speed main gear 9A and the sleeve 17A.

That is, the rotational torque input from the engine 11 in the direction of arrow F is output from the output shaft 8 in the direction of arrow G, and the vehicle runs by rotating wheels (not shown).

In order to shift the gear, the clutch pedal (not shown) is operated to cut off the connection between the crankshaft 12 and the input shaft 13 by the clutch 14 and the shift lever 21 is manually operated.
In step S ₁ in FIG. 3, a gear position sensor 53
And the gear position to be shifted is read from the lever position sensor 54 and input to the computer 22. And the computer 22
Operates the shift select unit 23 to release the gear.

Specifically, for example, in the case of shifting from the first speed to the second speed, the shift fork 20A for gear shifting moves leftward on the output shaft 8 in FIG. 2 and the sleeve 17A moves in the same direction. Thereby, the engagement between the first speed main gear 9A and the output shaft 8 is released.

In this state, the input shaft 13, the input gear 15, the counter gear 18, the counter shaft 16 and the first-speed counter gear 19A, the reverse counter gear 19B, and the second-speed counter gear 19C fixed to the counter shaft 16, Third-speed counter gear 19D, fourth-speed counter gear 19E, first-speed main gear 9A meshing therewith, reverse main gear 9B, second-speed main gear 9
C, the third-speed main gear 9D and the fourth-speed main gear 9E are coasting.

In step S ₂ , the output shaft rotation number detector 50 detects the rotation number NU of the output shaft 8, and in step S ₃ , the counter shaft rotation number detector 51 detects the counter shaft 16.
Is detected. Further input by the oil temperature sensor 52 detects the oil temperature T of the transmission oil to the computer 22 in step S _4.

[0052] Computer 22 is determined by calculating the target rotational speed NDT of the counter shaft 16 to permit shifting from the number of teeth of the gear to be shifting and the rotational speed NU of the output shaft 8 in step S _5.

[0053] Whether the absolute value of the difference between the current rotational speed ND of the target speed NDT and the counter shaft 16 is smaller than a predetermined value A which is determined in advance is determined in step S _6, the predetermined value A If also small, the rotational speed of the rotational speed and the second speed main gear 9C of the output shaft 8 is in a state of substantially synchronized, the flow proceeds to step S ₇ through the route R _1, the first clutch 5 and after releasing the second clutch 6, and sends a gear shift enable signal at step S _8.

That is, the shift fork 20B for gear shifting is moved rightward in FIG. 2 in accordance with a command from the computer 22, and the sleeve 17B is moved to the second speed main gear 9C.
, The second speed main gear 9C and the output shaft 8 are connected, and the shift operation to the second speed is completed.

[0055] If the absolute value of the difference between the target rotational speed NDT and the current rotational speed ND is larger than the predetermined value A indicates whether the target rotational speed NDT is greater than the current rotational speed ND in step S ₉ There is judged, it is judged that the greater a shift-down process proceeds to step S _10, to calculate the rate of change with respect to time of the difference in rotational speed.

[0056] The threshold value of the speed increasing pattern from step S ₁₁ in experimentally determined threshold value graph as a function of the oil temperature T of the change rate and the transmission oil to time of the difference of the rotational speed (Fig. 4) in the current state Find C.

[0057] Whether the difference between the current rotational speed ND of the target speed NDT and countershaft 16 at step S ₁₂ is smaller than the threshold value C is determined, if smaller, the rotational speed and the second speed of the output shaft 8 The rotation speed of the main gear 9C is substantially synchronized, so that the route R ₂
Through the process proceeds to step S _7, after releasing the first clutch 5 and the second clutch 6, and sends a gear shift enable signal at step S _8.

[0058] When the difference between the target rotational speed NDT and the current rotational speed ND is larger than the threshold value C from the computer 22 so as to increase the rotational speed of the countershaft 16 in step S ₁₃ of the first clutch 5 Operation is commanded.

[0059] That is, in order it is accelerated to rotational speed of has been first clutch 5 is operated to be 2-speed main gear 9 C determined by the computer 22 is a shift down operation, to operate the fluid pressure switching valve 58A Then, the compressed fluid is supplied to the first clutch 5, the piston is moved to bring the shaft side clutch plate 29 and the housing side clutch plate 30 into close contact with each other, and the speed of the synchro shaft 3 is increased. Of the output main gear 9C to approach the rotation speed of the output shaft 8.

In the case of shifting to the third speed or the fourth speed, the rotation of the synchronized shaft 3 is increased by the counter gear 25, the second speed main gear 9C, the second speed counter gear 19C, the counter shaft 16, the third speed or the fourth speed. Speed counter gear 19D,
The speed of the third-speed or fourth-speed main gears 9D and 9E is increased through 19E to approach the rotation speed of the output shaft 8.

[0061] Then, the process returns to the point A through the route R _3, repeats the same operation until again approached from step S ₁ to the target rotational speed NDT rotational speed of the countershaft 16.

[0062] When the target rotational speed NDT is smaller than the current rotational speed ND is at step S _9, it is determined that the shift-up process proceeds to step S _14, calculates the rate of change with respect to time of the difference in rotational speed I do.

In step S ₁₅ , the threshold B of the deceleration pattern in the present state is calculated from a graph of the threshold (FIG. 5) obtained experimentally as a function of the rate of change of the rotational speed difference with respect to time and the temperature T of the transmission oil. Ask.

[0064] Whether the difference between the current rotational speed ND of the target speed NDT and the counter shaft 16 is smaller than the threshold value B in step S ₁₆ is judged, if smaller, the rotational speed and the second speed of the output shaft 8 The rotation speed of the main gear 9C is substantially synchronized, so that the route R ₄
Through the process proceeds to step S _7, after releasing the first clutch 5 and the second clutch 6, and sends a gear shift enable signal at step S _8.

[0065] When the difference between the target rotational speed NDT and the current rotational speed ND is greater than the threshold value B is actuated from the computer 22 of the second clutch 6 in order to decelerate the rotational speed of the countershaft 16 in step S ₁₇ Is commanded.

That is, it is determined by the computer 22 that the operation is a shift-up operation, and the fluid pressure switching valve 58B is operated to release the compressed fluid by operating the second clutch 6 to reduce the rotation speed of the second speed main gear 9B. Second
And the piston is moved to bring the shaft side clutch plate 42 and the fixed clutch plate 41 into close contact with each other.

The fixed clutch plate 41 is attached to the shaft side clutch plate 42 rotating together with the synchro shaft 3 by the operation.
Braking force due to the frictional force with the
Rotation speed decreases.

Then, returning to the point A through the route R ₃ , the same operation is repeated until the rotation speed of the main gear shifted from step S ₁ is synchronized with the rotation speed of the output shaft 8 again.

When the pressure of the compressed fluid supplied to the first clutch 5 or the second clutch 6 is controlled by the computer 22 to perform rapid increase / decrease, the speed of the high-speed compressed fluid is increased or decreased. In the case of slightly increasing or decreasing the speed, a relatively low-pressure compressed fluid is supplied to increase or decrease the speed, so that the speed can be increased or decreased to a predetermined rotational speed in a short time, and the speed change operation can be performed. Can be done quickly.

Although the above embodiment has been described with respect to a so-called finger touch control type transmission, it is also applicable to a so-called automatic transmission.

[0071]

According to the present invention, the first clutch and the synchro shaft for connecting or disconnecting the output gear driven by the synchro gear fixed to the output shaft and the synchro shaft as described above, and the case of the transmission are provided. And a second clutch for connecting or disconnecting the gear. When the gear is downshifted, the first clutch is operated to increase the rotation speed of the synchro shaft, and when the gear is upshifted, the second clutch is operated. Since the rotation speed of the synchro shaft is reduced, and the countershaft is increased or reduced through the counter gear and the main gear spline-fitted to the synchronization shaft, the rotation speed of the main gear and the output shaft can be reduced in a short time. This has the effect of being able to be synchronized, and as a result the driver will The shift operation can be performed in Ri has the effect as possible out to ensure a nimble driving performance.

Further, based on the number of gear teeth to be shifted and the current output shaft speed, the target speed of the countershaft allowing the speed change operation, and the speed difference between the target speed and the current speed of the countershaft. Is calculated by calculation, and when the difference in the number of revolutions falls within the allowable range, the transmission is made to perform a shift operation, so that a smooth shift operation is performed without using a so-called conventional synchromesh mechanism. There is an effect that can be.

Further, the permissible range of the rotational speed difference is controlled by using an optimum value predetermined from the rate of change of the rotational speed difference with respect to time and the temperature of the transmission oil for each acceleration pattern or deceleration pattern of the countershaft. Therefore, there is an effect that a smooth gear change operation can always be performed in either the gear upshift or the gear down operation.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of a transmission control device of a transmission.

FIG. 2 is a schematic diagram illustrating a configuration of a shift control device.

FIG. 3 is a flowchart illustrating a routine of a shift control device.

FIG. 4 is a graph of a threshold value when the output shaft is decelerated.

FIG. 5 is a graph of a threshold value when the output shaft is accelerated.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Transmission control device of transmission 5 First clutch 6 Second clutch 8 Output shaft 10 Constant mesh gear type transmission 16 as an example of a transmission 16 Counter shaft 22 Computer as an example of a control device 27 Case 50 Output shaft rotation number detection Device 51 Counter shaft rotation speed detecting device 52 Oil temperature sensor 53 Gear position sensor

Claims (3)

(57) [Claims] 1. A first clutch for connecting or disconnecting a counter shaft and an output shaft to accelerate the rotation of the counter shaft, and connecting or disconnecting the counter shaft and a case of a transmission to connect the counter shaft to an output shaft. Using a second clutch for reducing the rotation, a target number of revolutions of the counter shaft allowing the gear shifting operation is calculated from the number of gear teeth to be gear-changed and the current number of revolutions of the output shaft. When the current rotation speed is lower than the target rotation speed, the first clutch is operated to accelerate the rotation of the counter shaft, and when the current rotation speed is higher than the target rotation speed, the second clutch is operated. To reduce the rotation of the counter shaft, the target rotation speed and the current speed of the counter shaft. A shift control method for a transmission, wherein a shift operation of the transmission is performed when a difference from a rotation speed becomes smaller than a predetermined value. 2. The predetermined value that enables the speed change operation is determined in advance for each acceleration pattern or deceleration pattern of the countershaft based on a time-dependent change rate of the rotational speed difference and an oil temperature of transmission oil. The shift control method for a transmission according to claim 1, wherein the value is a given value. 3. A first clutch that connects or disconnects the counter shaft and the output shaft, a second clutch that connects or disconnects the counter shaft and the case of the transmission, and a rotation number of the output shaft is detected. An output shaft rotation speed detection device, a counter shaft rotation speed detection device for detecting the rotation speed of the counter shaft, an oil temperature sensor for detecting the temperature of the transmission oil, and a gear position for detecting a transmission gear position selected by a shift operation. A target rotation speed of the countershaft that permits the shift operation is calculated from a sensor, the number of gear teeth selected by the shift operation, and the rotation speed of the output shaft, and the current rotation speed of the countershaft is calculated as the target rotation speed. When the number is smaller than the number, the first clutch A control device that operates to accelerate the rotation of the counter shaft, and when the current rotation speed is greater than the target rotation speed, activates the second clutch to reduce the rotation of the counter shaft. A shift control device for a transmission, which is characterized in that: