JP3496399B2 - Control device for continuously variable transmission for vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a continuously variable transmission for a vehicle.

[0002]

2. Description of the Related Art Conventionally, there is provided a control device for a continuously variable transmission for a vehicle, which continuously changes the rotation of an engine and transmits it to driving wheels, which is capable of manually switching one of a continuously variable transmission mode and a continuously variable transmission mode. Those having a switch are known.

For example, Japanese Unexamined Patent Publication (Kokai) No. 63-145138 discloses a continuously variable transmission having a mode selecting means for manually selecting one of the continuously variable transmission mode and the continuously variable transmission mode. When the continuously variable transmission mode is selected by the mode selection means, the gear ratio of the continuously variable transmission is controlled so that the engine rotation speed matches the target rotation speed. On the other hand, when the stepped speed change mode is selected by the mode selection means, the speed change ratio is used discretely, and one of the discrete speed change ratios is selected as the target value according to the running state, and the selected discrete speed change ratio is selected. The gear ratio of the continuously variable transmission is controlled by the gear ratio control means so as to match the gear ratio.

In the continuously variable transmission mode, generally, the engine speed is set so that the required driving force determined by the accelerator opening degree and the vehicle speed at that time can be most efficiently taken out in order to drive the vehicle along the minimum fuel consumption rate line. The gear ratio is continuously controlled. Therefore, the desired power performance can be realized with the best fuel economy.

In the stepped shift mode, a normal stepped (automatic)
As with the transmission, the gear ratio is discretely selected (to about 4 to 5 steps) and fixedly controlled. Therefore, within the selected discrete gear ratio, the engine speed basically changes in correspondence with the vehicle speed, so that the engine speed is high even when the accelerator pedal is frequently operated, for example, during traffic jam. It does not fluctuate, and during acceleration, the engine speed increases with increasing vehicle speed, so driving can be performed with less discomfort.

[0006]

However, in the one disclosed in the above publication, when the driver continues to use the stepped speed change mode, a specific portion of the belt contact surface of the variable pulley of the belt type continuously variable transmission is changed. Will continue to use only
There is a problem that uneven wear occurs on the variable pulley, and as a result, belt slip occurs at the time of gear shifting and the durability of the belt deteriorates.

The present invention has been made in view of the above conventional problems, and prevents uneven wear of the variable pulley when the driver continues to use the stepped transmission mode, suppresses belt slip, and reduces the belt slippage. It is an object of the present invention to provide a control device for a continuously variable transmission for a vehicle, which can improve the durability of the vehicle.

[0008]

According to a first aspect invention, one of the continuously variable shift mode and the stepped shift mode, a mode selection means for enabling selection manually, continuously variable shift mode is selected by the mode selecting means When the stepped speed change mode is selected by the mode selecting means, the speed change ratio is discretely controlled while the engine speed matches the target speed. And a gear ratio control means for controlling the gear ratio of the continuously variable transmission so that any one of the discrete gear ratios is selected as a target value in accordance with the running state and the selected discrete gear ratio matches the selected discrete gear ratio. Judgment of vehicle usage environment in vehicle continuously variable transmission controller
And, the determination binding when the stepped shift mode is selected
On the basis of the result , a discrete speed ratio changing means for automatically changing the set of discrete speed ratios which are the target values of the speed ratio controlling means is provided , and the discrete speed ratio changing means is adapted to the driver.
The condition of changing the set of discrete transmission ratios is provided to identify the driver
Is detected by detecting the slide amount of the driver's seat.
It is characterized in that the set of discrete transmission ratios is changed in association with the result . A second aspect of the present invention is a continuously variable transmission mode and a stepped transmission.
Mode selection to manually select one of the modes
Means and its mode selection means select the continuously variable transmission mode.
If selected, the engine speed matches the target speed.
The gear ratio of the continuously variable transmission is controlled so that
When the stepped shift mode is selected by the
Uses the gear ratio discretely depending on the driving condition.
Select a discrete gear ratio as a target value
Control the transmission ratio of the continuously variable transmission so that it matches the dispersion ratio.
Of a continuously variable transmission for a vehicle having a gear ratio control means
The device determines the operating environment of the vehicle,
If the mode is selected, the previous
The discrete speed ratio set as the target value of the speed ratio control means is automatically set.
A means for dynamically changing the discrete transmission ratio is provided,
The discrete speed ratio changing means is a group of discrete speed ratios depending on the driver.
With the condition to change the driver's identification of the steering
By detecting the amount of tilt / telescopic adjustment
Change the set of discrete gear ratios in conjunction with the detection result.
Is characterized by.

[0009]

According to the first and second inventions, the vehicle
When the stepped speed change mode is selected , both use environments are judged, and based on the judgment result, the set of discrete speed change ratios which are the target values of the speed change ratio control means are automatically changed as appropriate. And set the discrete gear ratio according to the driver.
With the conditions to change, the driver's identification can be identified by sliding the driver's seat.
Amount or steering tilt / telescopic adjustment amount
It is performed by detecting the
Since the set of speed ratios is changed, it is possible to prevent uneven wear of the pulleys by using only the portion of the variable pulley relating to a certain gear ratio. Also, for example, air-fuel ratio modification
The set of discrete transmission ratios can be changed according to the positive coefficient,
The changes will change the vehicle use environment such as atmospheric pressure and temperature.
Even with the same accelerator opening and gear, the same driving force is obtained.
Will be able to

[0010]

In a preferred embodiment, the discrete speed ratio changing means determines the amount of use of a vehicle and automatically changes the set of discrete speed ratios based on the result of the determination. .

[0011] Thus, when the same set of discrete gear ratios is used, for example, a predetermined number of times or a predetermined time period, to more effectively suppress uneven wear of the variable pulley for the discrete gear ratio set is changed You can

In another preferred embodiment, the discrete speed ratio changing means determines the traveling place of the vehicle and automatically changes the set of discrete speed ratios based on the determination result.

Thus, for example, in a vehicle equipped with means for detecting the current vehicle position such as a navigation system , the set of discrete transmission ratios is changed according to whether the vehicle is currently traveling on the highway or in the city area. It is possible to make the change, and it becomes possible to make the running more suitable for the current place of travel.

In another preferred embodiment, the discrete speed ratio changing means determines the traveling mode of the vehicle and automatically changes the set of discrete speed ratios based on the determination result.

Thus, for example, the vehicle running mode such as steady running or sports running is determined from the range and frequency of the change in the accelerator opening, and the set of discrete gear ratios is changed according to the running mode. With this change, it is possible to travel more in accordance with the travel mode.

In another preferred embodiment, the discrete transmission ratio changing means determines the use time of the vehicle and automatically changes the set of discrete transmission ratios based on the determination result.

As a result, it is possible to change the set of discrete transmission ratios depending on the day of the week and the season, for example, and it becomes possible to travel in accordance with the driving conditions that differ depending on the time of use.

[0018]

[0019]

Hereinafter, a more specific example of the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a schematic diagram showing a control device for a continuously variable transmission for a vehicle to which the present invention is applied.

In FIG. 2, the crankshaft 12 of the engine 10 is connected to an input shaft 18 of a belt type continuously variable transmission (CVT) 16 via an electromagnetic clutch 14. CVT
The 16 output shafts 20 are connected to the drive wheels of the vehicle via a differential gear unit or the like (not shown). As a result, the rotational force of the engine 10 is transmitted to the drive wheels.

Input shaft 18 and output shaft 2 of the CVT 16
Variable pulleys 22 and 24 having variable effective diameters are provided at 0. A transmission belt 26 is wound around the variable pulleys 22 and 24. The variable pulleys 22 and 24 are movable with respect to the fixed rotating bodies 28 and 30 fixed to the input shaft 18 and the output shaft 20 and the input shaft 18 and the output shaft 20 in the axial direction but are not relatively rotatable in the rotating direction. The movable rotating bodies 32 and 34 are provided.

The V-groove width formed between the fixed rotors 28 and 30 and the movable rotors 32 and 34 is changed by changing the thrust applied to the movable rotors 32 and 34 from the hydraulic cylinders 36 and 38. That is, the hanging diameter of the belt is changed.

The hydraulic oil in the oil tank 40 is pressure-fed by the oil pump 42, and the line oil pressure is adjusted by the pressure adjusting valve 44 controlled by the electronic control unit (ECU) 50. This line hydraulic pressure is supplied to the secondary side hydraulic cylinder 38 that applies a thrust force to the secondary side variable pulley 24 via a line oil passage 46.

The ECU 50 (gear ratio control means) controls the flow rate control valve 48 to supply the working oil in the line oil passage 46 to the primary side hydraulic cylinder 36 to reduce the gear ratio, or The hydraulic oil in the hydraulic cylinder 36 is discharged to the drain to increase the gear ratio.

In the intake pipe of the engine 10, a throttle valve 54 which is opened and closed by an accelerator pedal 52,
A throttle sensor 56 for detecting the opening of the throttle valve 54 is provided. The engine 10 is provided with an engine rotation sensor 58 for detecting an engine rotation speed based on a signal from an ignition circuit or the like.

A first rotation sensor 6 for detecting the rotation speeds of the input shaft 18 and the output shaft 20 is provided in the vicinity of the primary-side fixed rotating body 28 and the secondary-side fixed rotating body 30 of the CVT 16.
0 and a second rotation sensor 62 are provided.

A shift lever 6 provided near the driver's seat
4 is a shift sensor 66 for detecting the operation position.
Is provided.

A mode changeover switch (mode selecting means) 68 for manually selecting the continuously variable transmission mode and the stepped transmission mode is provided in the vehicle compartment.

In the continuously variable transmission mode, the CV is set so that the target input shaft rotation speed determined to operate the engine 10 on the minimum fuel consumption rate curve and the actual input shaft rotation speed match.
This is a mode for steplessly controlling the gear ratio of T16. On the other hand, the stepped shift mode is a discrete shift mode that should be selected from a prepared shift diagram (map) based on the actual throttle valve opening and the vehicle speed, similarly to the shift control in the conventional automatic transmission. This is a mode in which the ratio (gear stage) is determined and the gear ratio of the CVT 16 is controlled so as to be the discrete gear ratio.

Further, in the present embodiment, several sets of discrete transmission ratios used in the stepped transmission mode are prepared, and as will be described later, these discrete transmission ratios actually used according to certain conditions. Is changed by the ECU 50 (discrete gear ratio changing means).

The control of the CVT 16 in the continuously variable transmission mode and the stepped transmission mode will be described below. This CV
The control of T16 is executed according to the flowchart shown in FIG.

In step 100 of FIG. 3, it is determined whether the mode changeover switch 68 is operated to select the continuously variable transmission mode or the stepped transmission mode. When it is determined in step 100 that the continuously variable transmission mode is selected, the next step 1
At 10, the target input shaft rotation speed Nin ^* is determined from the continuously variable transmission mode map based on the actual throttle valve opening or the actual throttle valve opening and the vehicle speed.

When it is determined in step 100 that the stepped speed change mode is selected, the target input shaft rotational speed Nin ^* is determined in step 120 based on the actual throttle valve opening and the vehicle speed. To be done. That is, the shift speed (first speed to third speed) for determining the discrete speed ratio is determined from the map as shown in FIG. 4 based on the throttle valve opening and the vehicle speed. Then, the target input shaft rotation speed N is set so that the discrete gear ratio corresponding to the determined gear position is obtained.
in ^* is calculated.

In this way, the target input shaft rotation speed Nin ^*
Is determined, the control value Vcvt for the flow rate control valve 48 is set to the target input shaft rotation speed Nin in the next step 130.
^{* And} the following (1) based on the actual input shaft rotation speed Nin
Determined by the formula. Note that k is a constant.

Vcvt = k · (Nin−Nin ^* ) / Nin (1)

In the next step 140, the pressure regulating valve 4
The control value PL for 4 is the output torque T of the engine 10.
e, the speed ratio e of the CVT 16 (the reciprocal of the gear ratio r), the output shaft rotation speed Nout, etc. are determined by the following equation (2).

PL = k1 · | Te | · (e + 1) / e−k2 · Nout ² + ΔP (2)

The control value PL determined by the equation (2) corresponds to the tension of the transmission belt 26, in other words, the line hydraulic pressure value for making the clamping pressure of the variable pulley 24 against the transmission belt 26 necessary and sufficient. ing. The second term on the right side of the equation (2) is a correction term for the centrifugal oil pressure, and ΔP of the third term is a margin value. Also, k1 and k2 are constants.

Next, the discrete transmission ratio used in the stepped transmission mode in the first embodiment will be described. The first embodiment is a representative example of each of the following second and subsequent embodiments. In the present embodiment, the discrete speed ratio (the set of discrete speed ratios corresponding to the first speed, the second speed, ...) Used in the stepped speed change mode is changed according to a change in a certain condition. I am trying. As a result, the belt contact position of the variable pulley can be changed, uneven wear of the variable pulley can be prevented, and durability can be improved.

FIG. 5 is a flow chart showing the control for changing the set of discrete transmission ratios of this embodiment.

Here, the set of discrete transmission ratios is R
N + such as (1), R (2), ..., R (n + 1)
One set is prepared. Each of the n + 1 discrete speed ratio sets is composed of a discrete speed ratio from the first speed to the final speed.

For example, R (1) = (r1, r2, r3, r4, r5) R (2) = (r1 ', r2', r3 ', r4', r
5 ', r6'), each represents a different set of discrete transmission ratios. Here, r1 represents the discrete speed ratio of the first speed, r2 represents the discrete speed ratio of the second speed, and the same applies to the other speed ratios. Further, the final speed may be the third speed, the fourth speed, or the fifth speed depending on the set of the discrete speed ratios.

The control shown in the flowchart of FIG. 5 is executed at regular time intervals.

In step 200 of FIG. 5, it is determined whether the condition 1 is satisfied. This condition is not particularly limited here, but a condition that appropriately changes with the use of the vehicle is used, and specifically, various conditions can be considered as shown in the second and subsequent embodiments. If the condition 1 is satisfied, in step 210, the set of discrete transmission ratios R (1)
Select to finish.

If the condition 1 is not satisfied, step 2
Then, the process proceeds to step 20, and it is determined whether the condition 2 is satisfied. When the condition 2 is satisfied, the discrete speed ratio set R (2) is selected in step 230, and the process ends.

If the condition 2 is not satisfied, the process proceeds to the next step, and similarly, it is determined whether or not the condition n is satisfied. When it is determined in step 240 that the condition n is satisfied, the routine proceeds to step 250, where a set R of discrete speed ratios
Select (n) to finish.

If the condition n is not satisfied in step 240, the set R of discrete speed ratios is set in step 260.
Select (n + 1) to end the process.

In the example shown in FIG. 5, it is determined whether or not each condition is satisfied in order, and when a specific condition is satisfied, a specific set of discrete speed ratios is directly selected. Of course, the basic flow is not limited to this,
For example, it goes without saying that a specific set may be selected by a combination of AND and OR of two or more conditions.

In this way, by changing the set of discrete speed ratios used in the stepped speed change mode, it is possible to prevent only a specific position of the variable pulley from being used and prevent uneven wear of the variable pulley. You can

The following embodiments embody various conditions described above for changing the set of discrete transmission ratios.

The conditions that change appropriately with the use of the vehicle include (1) the number of occurrences of a certain event, (2) the condition directly related to the amount of use of the vehicle, such as the time of use of the vehicle, and (3) The use conditions of the vehicle include those depending on the place of travel (4) depending on the traveling mode of the vehicle (5) depending on the time when the vehicle is used (6) depending on the environment in which the vehicle is used.

In the second to fifth embodiments, the set of discrete transmission ratios is changed according to the number of occurrences of a certain event.

First, the second embodiment will be described.

In the second embodiment, the set of discrete transmission ratios is changed when the number of times the ignition switch changes from off to on reaches a predetermined number.

That is, the number of times the ignition switch changes from OFF to ON is counted, and when the number of times the ignition switch reaches a predetermined number is changed, the selection variable i for selecting the set of discrete transmission ratios is changed. 5 is performed. For example, whether or not the condition n is satisfied is determined by whether or not i = n is satisfied, and the set R (i) of the discrete transmission ratios is determined. Make sure you choose. Here, as a method of changing the selection variable i, the selection variable i may be incremented or decremented. Alternatively, using a random number α (0 ≦ α <1),
You may make it take the integer part by multiplying this (alpha) by n + 1. That is, when expressed by an expression, INT may be an integer function, and i = INT {α × (n + 1)}.

Next, a third embodiment will be described.

The third embodiment is intended to change the gear ratio set according to the number of times of gear shift occurrence between the discrete gear ratios in the stepped gear shift mode.

The method is the same as counting the number of times the ignition switch is switched from OFF to ON in the second embodiment, counting the number of shift occurrences in the stepped mode, and discretizing when the predetermined number is reached. The gear ratio set is changed.

This is, so to speak, to count how much the position of the variable pulley with respect to the discrete speed ratio is used, and it is possible to effectively prevent uneven wear of the variable pulley.

Next, a fourth embodiment will be described.

In the fourth embodiment, the set of discrete transmission ratios is changed according to the number of times the brake is depressed.

Also in this method, similarly to the second embodiment, the number of times the brake pedal is stepped on is counted, and when it reaches a predetermined number, the set of discrete transmission ratios may be changed.

This normally has the same effect as counting the number of shifts because the shift is normally performed by the depression of the brake.

Next, a fifth embodiment will be described.

The fifth embodiment changes the set of discrete transmission ratios depending on the number of shifts from the N range to the D range.

This method is also performed in the same manner as in the second embodiment by counting the number of shifts and changing the set of discrete transmission ratios when the number of times reaches a predetermined number.

This has substantially the same effect as counting the number of times the ignition switch is turned on and off.

In the following sixth and seventh embodiments, the set of discrete transmission ratios is changed according to the usage time of the vehicle.

First, the sixth embodiment will be described.

The sixth embodiment is intended to change the set of discrete transmission ratios every time a fixed time elapses.

In the present embodiment, a use time counter is provided, and the set of discrete gear ratios is changed every time a fixed time elapses by changing the selection variable i as in the second embodiment. It is something to do. Instead of counting the number of occurrences of a certain event in the above embodiments, the usage time is simply counted. This makes it possible to prevent uneven wear of the variable pulley under simple determination conditions.

Next, a seventh embodiment will be described.

The seventh embodiment changes the set of discrete transmission ratios every time the vehicle travels a certain distance.

In the present embodiment, a traveling distance counter is provided, and the set of discrete transmission ratios is changed every time the vehicle travels a fixed distance, by changing the selection variable i as in the second embodiment. To do. Generally, it is considered that the usage time and the traveled distance are substantially proportional to each other, and the distance is viewed instead of the time. This is also a simple judgment condition.

The above-described embodiments can be regarded as an attempt to change the set of discrete transmission ratios according to the amount of use of the vehicle.

Therefore, although it is excellent in that uneven wear of a specific position of the pulley is effectively prevented, the result of changing the set of discrete transmission ratios is not particularly considered.

In all of the four embodiments described below, the set of discrete transmission ratios is changed according to the usage conditions of the vehicle, and it is considered that better results can be obtained by the change.

The eighth embodiment is intended to change the set of discrete transmission ratios according to the traveling location of the vehicle.

The present embodiment is applied to a vehicle equipped with a navigation system. That is, the region on the map of the navigation system is divided into urban areas, suburbs, highways, mountain roads, etc., and a group of discrete transmission ratios to be used there is determined in advance for each region. For example, if the city area is the standard, the suburbs are high geared (shift to the high side)
And higher geared on highways, and low yarded on mountain roads (shift to low side)
And close ratio (value where each discrete gear ratio approaches)
Try to

In actual driving, the current position of the vehicle is confirmed on the map of the navigation system, and a set of discrete gear ratios corresponding to the position is selected.

Although the device becomes complicated, it is possible to select the discrete gear ratio most suitable for the actual running.

Next, a ninth embodiment will be described.

In the ninth embodiment, the set of discrete gear ratios is changed according to the running mode of the vehicle. That is, the running mode is determined from the range and frequency of changes in the accelerator opening, and the set of discrete transmission ratios is changed accordingly.

For example, as shown in FIG. 6, the travel mode is mapped according to the range of change in the accelerator opening and the frequency of the change. Then, in steady running, a set of basic discrete gear ratios is selected, while in the following running state, a wider range of discrete gear ratios (values in which the discrete gear ratios are separated) are set, and individual discrete gear ratios are set. Increase the range of use of the ratio to prevent frequent shifting. Further, it is possible to improve the driving performance by setting a lower gear for the uphill traveling and a lower gear and a close ratio for the sports traveling.

Next, a tenth embodiment will be described.

The tenth embodiment is equipped with a calendar,
The set of discrete transmission ratios is changed according to the day of the week and the season. For example, it is conceivable to use low gear on weekends and high gear during the week. Or, use higher gear in winter than in summer. This is because the traveling mode and traveling ability are different depending on the time of use.

Next, the eleventh embodiment will be described.

In the eleventh embodiment, the set of discrete gear ratios is changed according to the vehicle environmental conditions.

In the eleventh embodiment, the set itself is changed by changing the value of each discrete speed ratio of the set of discrete speed ratios according to the air-fuel ratio correction coefficient.

When the uncorrected air-fuel ratio correction coefficient is FAF0, the jth discrete speed ratio of this set is rj0, and the jth discrete speed ratio when the air-fuel ratio correction coefficient is FAF is rj, By changing the j-th gear ratio rj so that rj = (FAF0 / FAF) .rj0, each discrete gear ratio belonging to this group is changed, and the group of discrete gear ratios itself is changed.

As a result, even if the atmospheric pressure or the temperature (season or weather) changes, the same accelerator opening and the same driving force can be obtained at the shift speed.

The same control can be performed by detecting the atmospheric pressure and the intake air temperature.

As described above, according to each embodiment, since the set of discrete transmission ratios is changed according to various conditions, even when the driver continues to use the stepped transmission mode, the variable pulley Uneven wear can be suppressed, belt slip can be suppressed, and belt durability can be improved. In particular, as described in the eighth to eleventh embodiments, when the discrete gear ratio is automatically changed appropriately based on the judgment result of the use condition of the vehicle, it is possible to improve drivability and fuel efficiency. You can

Further, the discrete gear ratios may be automatically changed as appropriate by using the conditions described in the second to eleventh embodiments in combination, and further, other conditions may be used in addition to these conditions. You may do it.

As another condition, the engine warm-up state may be considered. In this case, the engine warm-up state is judged based on the engine water temperature, and in the warm-up process, the discrete shift is applied so as to give the same driving force to the accelerator depression amount. In order to change the ratio set, the water temperature correction coefficient k is obtained from the graph of the water temperature and the water temperature correction coefficient as shown in FIG. 7, and when there is no correction, this water temperature correction coefficient k is set to the j-th gear ratio rj0 of this group. It is also possible to change the set of discrete transmission ratios to the low gear side by multiplying by.

A condition for changing the set of discrete transmission ratios may be added according to the driver. In this case, the driver's identification is determined by the amount of slide of the driver's seat, the amount of tilt / telescopic adjustment of the steering wheel, or the like. It may be performed by detecting, and the set of discrete transmission ratios may be changed in association with the detection result.

[0099]

As described above, according to the present invention, since the set of discrete transmission ratios is changed according to a certain condition, the deviation of the variable pulley when the driver continues to use the stepped transmission mode. It is possible to prevent abrasion, and it is possible to suppress belt slip and deterioration of belt durability.

[Brief description of drawings]

FIG. 1 is a block diagram showing the gist of the present invention.

FIG. 2 is a configuration diagram showing an outline of a control device for a vehicle continuously variable transmission to which the present invention is applied.

FIG. 3 is a flowchart showing control in a continuously variable shift mode and a stepped shift mode according to the present embodiment.

FIG. 4 is a map for determining a shift position from a vehicle speed and a throttle valve opening in this embodiment.

FIG. 5 is a flowchart showing control for changing a set of discrete transmission ratios in the present embodiment.

FIG. 6 is a map for determining a driving mode from a range of accelerator opening change and a frequency of change.

FIG. 7 is a diagram showing an example of the relationship between the water temperature and the water temperature correction coefficient.

[Explanation of symbols]

10 ... Engine 12 ... crankshaft 14 ... Electromagnetic clutch 16 ... Belt type continuously variable transmission (CVT) 18 ... Input shaft 20 ... Output shaft 22, 24 ... Variable pulley 26 ... Transmission belt 50 ... Electronic control unit (ECU) 68 ... Mode change switch

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Claims (6)

(57) [Claims] 1. A mode selection means for manually selecting one of a continuously variable transmission mode and a stepped transmission mode, and a target engine speed when the continuously variable transmission mode is selected by the mode selection means. While controlling the gear ratio of the continuously variable transmission so as to match the rotation speed, when the stepped gear change mode is selected by the mode selection means, the gear ratio is used discretely, depending on the running state. And a gear ratio control means for controlling the gear ratio of the continuously variable transmission so as to match the selected discrete gear ratio as a target value. In the above, the operating environment of the vehicle is judged, and when the stepped speed change mode is selected, the group of discrete speed ratios which is the target value of the speed ratio control means is automatically changed based on the result of the judgment. Discrete transmission ratio changing means Comprising further the discrete transmission ratio changing means, a discrete variable in response to the driver
Equipped with a condition to change the speed ratio set, the driver's identification
It is performed by detecting the slide amount of the
A control device for a continuously variable transmission for a vehicle, which is operated to change a set of discrete transmission ratios . 2. A continuously variable transmission mode and a stepped transmission mode.
Mode selecting means for manually selecting one of the
When the continuously variable transmission mode is selected by the mode selection means
So that the engine speed matches the target speed.
While controlling the gear ratio of the continuously variable transmission, the mode selection means
If the stepped speed change mode is selected, change the gear ratio.
Used discretely, either discrete gear ratio depending on driving conditions
As the target value and match the selected discrete transmission ratio
To control the gear ratio of the continuously variable transmission so that
In a control device for a continuously variable transmission for a vehicle having a step, the operating environment of the vehicle is judged, and the stepped transmission mode is selected.
In the case of a shift, the gear ratio control means is based on the determination result.
To automatically change the set of discrete transmission ratios that are the target values of
And a discrete speed ratio changing means, wherein the discrete speed ratio changing means is a discrete speed ratio changing means according to the driver.
Steer driver identification with conditions to change speed ratio sets
Detecting the tilt / telescopic adjustment amount of the ring
And change the set of discrete speed ratios in synchronization with the detection result.
A control device for a continuously variable transmission for a vehicle, comprising: 3. The discrete speed ratio changing means according to claim 1 or 2 , wherein the discrete speed ratio changing means determines the amount of use of the vehicle and automatically changes the set of discrete speed ratios based on the determination result. Control device for a continuously variable transmission for a vehicle. 4. The discrete speed ratio changing means according to claim 1 or 2 , wherein the discrete speed ratio changing means determines the traveling place of the vehicle and automatically changes the set of discrete speed ratios based on the determination result. Control device for a continuously variable transmission for a vehicle. 5. The discrete speed ratio changing means according to claim 1 or 2 , wherein the discrete speed ratio changing means determines a running mode of the vehicle and automatically changes the set of discrete speed ratios based on the determination result. Control device for a continuously variable transmission for a vehicle. 6. The discrete speed ratio changing means according to claim 1 or 2 , wherein the discrete speed ratio changing means determines the use time of the vehicle and automatically changes the set of discrete speed ratios based on the determination result. Control device for a continuously variable transmission for a vehicle.