JPH09217824A - Shift control device for continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the increase of the working oil temperature of a continuously variable transmission as an influence exercised on operability is reduced as much as possible. SOLUTION: A signal is inputted from an M range switch 11 and it is decided whether a working oil temperature T1 exceeds a high oil temperature control incoming reverse temperature value and it is decided whether the target input number NP' of revolutions of a transmission exceeds the number of revolutions on the maximum input side. When the condition is satisfied, regulation is effected by a maximum input number of revolutions regulating part 14 such that the upper limit of the target incoming number of revolutions of a transmission is gradually reduced to the maximum input number NPMAX of revolutions. A target change gear ratio is computed based on the target input number of revolutions of a transmission, regulated by the maximum input number NPMAX and a car speed VSP.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift control device applied to a continuously variable transmission such as a belt type continuously variable transmission.

[0002]

2. Description of the Related Art A shift control device for such a continuously variable transmission is described in, for example, Japanese Patent Application Laid-Open No. 62-286847.

[0003]

However, in such a continuously variable transmission shift control device, the continuously variable transmission is operated by heating of the continuously variable transmission shift control device due to heat generation of the engine. Since the gear ratio is reduced when the oil temperature rises, there is no inconvenience in the automatic gear shift mode, that is, the drive range (D range), but the manual gear shift allows manual gear shift of the gear ratio by manual operation of the select lever. Mode or manual range (M range)
When this is applied to the shift control device of the continuously variable transmission having the above, there is a problem. That is, when downshifting with a continuously variable transmission having an M range, that is, when increasing the gear ratio, the driver often expects strong engine braking, which is described in Japanese Patent Laid-Open No. 62-286847. If the gear ratio is suddenly reduced when the hydraulic oil temperature is high as in the shift control device for a continuously variable transmission, the driver cannot feel the engine brake as expected, and the driver feels uncomfortable.

Further, since the heat generation of the shift control device of the continuously variable transmission itself depends on the input side rotation speed, the above-mentioned JP-A-62-2 is used.
In the case of the shift control device for a continuously variable transmission described in Japanese Patent No. 86847, even if it is not necessary to change the gear ratio because the input side rotation speed is low, there is a risk that the hydraulic oil temperature may rise and gear shifting may occur. is there.

An object of the present invention is to provide a shift control device for a continuously variable transmission which effectively prevents an increase in the hydraulic oil temperature of the continuously variable transmission while minimizing the influence on drivability.

[0006]

A transmission control device for a continuously variable transmission according to a first aspect of the present invention is a continuously variable transmission having a manual range in which a gear ratio can be manually changed by manually operating a select lever. In the control device, the manual range detecting means for detecting that the continuously variable transmission is in the manual range, the oil temperature detecting means for detecting the operating oil temperature of the continuously variable transmission, and the transmission suitable for the running conditions of the vehicle An input side rotation speed setting means for setting an input side rotation speed; and an input side rotation speed regulation means for controlling the input side rotation speed to be equal to or lower than a set rotation speed less than a maximum input side rotation speed during normal shift control, When the transmission is in the manual range, the hydraulic oil temperature is equal to or higher than the first set value, and the input side rotation speed is equal to or higher than the set rotation speed, the input side rotation speed is up to the set rotation speed. Low It is characterized in the provision of the speed change control means for shifting control to the speed ratio as.

In the shift control device for a continuously variable transmission according to a second aspect of the present invention, the shift control means gradually reduces the set rotational speed from the maximum input side rotational speed during the shift control. It is characterized by that.

In the shift control device for a continuously variable transmission according to a third aspect of the present invention, after the shift control means performs the shift control, the hydraulic oil temperature is less than a second set value below the first set value. In this case, the normal shift control is performed.

In the shift control device for a continuously variable transmission according to a fourth aspect of the present invention, the shift control means gradually changes the set rotational speed to the maximum input side rotational speed while the shift control is changed to the normal shift control. It is characterized in that it is made to rise.

In the shift control device for a continuously variable transmission according to a fifth aspect of the present invention, the shift control means is configured such that the input side rotation speed exceeds the set rotation speed during transition from the normal shift control to the shift control. In the case of increasing the gear ratio of the continuously variable transmission, the input side rotation speed is gradually decreased from the maximum input side rotation speed to the set rotation speed, and the input side rotation speed is reached after a predetermined time or a predetermined control count has elapsed. The speed ratio of the continuously variable transmission is not increased so that the number exceeds the set rotation speed, and / or the input side rotation speed exceeds the set rotation speed during the shift from the shift control to the normal shift control. When increasing the gear ratio of the continuously variable transmission, the input side speed is gradually increased from the set speed to the maximum input side speed, and the normal speed change control is performed after a lapse of a predetermined time or a predetermined control number. To do It is characterized in that the.

[0011]

According to the shift control device of the continuously variable transmission of the first aspect of the present invention, the continuously variable transmission is in the manual range, the hydraulic oil temperature is equal to or higher than the first set value, and the input side is provided. When the number of revolutions is equal to or higher than the set number of revolutions, shift control is performed so that the input side number of revolutions is reduced to the set number of revolutions.

By thus controlling the input side rotation speed, even if the hydraulic oil temperature is above the first set value, if the input side rotation speed is below the set rotation speed, the shift control means maintains the gear ratio. Therefore, even if the driver increases the gear ratio in the manual range, the engine braking as expected by the driver can be obtained, and the influence on the drivability can be minimized. Further, since the input side rotation speed is restricted to be equal to or lower than the set rotation speed, the hydraulic oil temperature is prevented from rising.

According to the shift control device for a continuously variable transmission of the second aspect of the present invention, the set rotation speed is gradually decreased from the maximum input side rotation speed during the shift control by the shift control means. By gradually changing the set rotational speed in this manner, in addition to the action and effect according to the first aspect, there is an action and effect that the driver's discomfort can be reduced.

According to the shift control device for a continuously variable transmission according to a third aspect of the present invention, it is normal when the hydraulic oil temperature becomes lower than the second set value below the first set value after the shift control by the shift control means. Shift control is performed. Thus, considering the variation in the characteristics of the oil temperature detecting means, by providing a hysteresis between the time when the speed change control by the speed change control means is started and the time when the speed change control is returned to the normal speed change control, the above-mentioned claim 1 or 2 is provided. In addition to the action and effect of the above, it has the action and effect of preventing hunting.

According to the shift control device for a continuously variable transmission of claim 4 of the present invention, while the shift control by the shift control means is changed to the normal shift control, the set rotational speed is gradually increased to the maximum input side rotational speed. . By gradually changing the set rotational speed in this manner, in addition to the action and effect according to the third aspect, there is an action and effect that the driver's discomfort can be reduced.

According to the shift control device for a continuously variable transmission according to a fifth aspect of the present invention, during the transition from the normal shift control to the shift control by the shift control means, the continuously variable input speed is set so as to exceed the set speed. When increasing the gear ratio of the transmission, the input side rotation speed is gradually decreased from the maximum input side rotation speed to the set rotation speed, and the input side rotation speed exceeds the set rotation speed after a lapse of a predetermined time or a predetermined control number. As described above, the gear ratio of the continuously variable transmission is not increased, and / or during shifting from the gear shift control by the gear shift control means to the normal gear shift control, the input side rotation speed exceeds the set rotation speed. When increasing the gear ratio, the input side rotation speed is gradually increased from the set rotation speed to the maximum input side rotation speed, and the normal speed change control is performed after a lapse of a predetermined time or a predetermined control number.

As described above, when the gear ratio of the continuously variable transmission is increased so that the input side rotation speed exceeds the set rotation speed, the input side rotation speed is gradually decreased and / or increased, For example, even when it is desired to decelerate the vehicle by using the engine brake before the corner, the gear ratio desired by the driver can be obtained while reducing the influence on the drivability. In addition to the above-described actions and effects, it is possible to obtain the engine braking that is expected by the driver.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a shift control device for a continuously variable transmission according to the present invention will be described in detail with reference to the drawings.
In the drawings, the same members are designated by the same reference numerals.
FIG. 1 is a system diagram showing an embodiment of a shift control device for a continuously variable transmission according to the present invention. In FIG. 1, continuously variable transmission 1 receives power from engine 2 via torque converter 3, performs stepless speed change with respect to this input, and transmits it to output shaft 4.

Step motor 6 of control valve 5
The step motor operation amount Step of is determined by the transmission controller 7. This step motor operation amount S
In order to determine step, the transmission controller 7
A signal from a vehicle speed sensor 8 that detects a vehicle speed VSP, a signal from a throttle opening sensor 9 that detects an engine throttle opening TVO, and a D range switch 1 that determines that the select lever is in the D range, that is, the automatic shift mode.
A signal from 0, M range switch 11 for determining that the select lever is in the M range, that is, the manual shift mode
(Corresponding to the manual range detecting means in the present invention) and a signal from an oil temperature sensor 12 (corresponding to the oil temperature detecting means in the present invention) for detecting the operating oil temperature T _x of the continuously variable transmission. Enter.

FIG. 2 is a schematic diagram of a shift control system of an embodiment of a shift control device for a continuously variable transmission according to the present invention. The transmission controller 7 continuously performs the shift control at regular operation intervals by the processing shown in the functional block diagram of FIG. 2 or by executing the corresponding program while the ignition switch (not shown) is on. And

The target input rotation speed calculation unit 13 corresponds to the input side rotation speed setting means in the present invention, and when the signal from the D range switch 10 is input, the vehicle speed sensor 8 and the vehicle speed sensor 8 are obtained based on the D range map. From the vehicle speed VSP detected by the throttle opening sensor 9 and the throttle opening TVO, a transmission target input rotation speed N _P ^* (which may be the engine target rotation speed) suitable for the traveling condition is obtained. When a high-side signal or a low-side signal from the M range switch is input, the vehicle travels from the vehicle speed VSP and the throttle opening TVO detected by the vehicle speed sensor 8 and the throttle opening sensor 9 based on the M range map. A transmission target input rotation speed N _P ^* (which may be the engine target rotation speed) which is suitable for the condition is obtained.

Maximum input (engine) speed regulation unit 14
Corresponds to the input side rotation speed regulating means in the present invention, and M
In response to signals from the range switch 10 and the oil temperature sensor 12, the maximum input rotation speed is restricted to a predetermined rotation speed or less, as will be described later.

The target gear ratio calculation unit 15 corresponds to the gear change control means in the present invention, and calculates the target gear ratio in accordance with the signals from the vehicle speed sensor 8 and the maximum input speed control unit 14.
The step motor operation amount Step is output.

The oil temperature warning lamp 16 receives a signal from the oil temperature sensor 12, and lights up when the value of the hydraulic oil temperature T _X exceeds a predetermined value to warn the driver.

The operation of this embodiment will be described. FIG. 3 is a flow chart of an embodiment of a shift control device for a continuously variable transmission according to the present invention, and FIG. 4 is a manual range shift control in an embodiment of a gear shift control device for a continuously variable transmission according to the present invention. FIG.

In this routine, the transition from the normal control (this control will be described later in step S3) to the high oil temperature control (this control will be described in step S4 later) and the high oil temperature control to the normal control are performed. Return to. First, step S
At 1, it is determined whether the transmission controller 7 (FIGS. 1 and 2) is under high oil temperature control. If the high oil temperature control is being performed, it is determined in step S2 whether or not the high oil temperature control condition is satisfied.

In step S2, a high-side or low-side signal is input from the M range switch 11 (FIGS. 1 and 2), and the operating oil temperature T _x detected by the oil temperature sensor 12 (FIGS. 1 and 2) is high oil. The transmission target input speed N _P ^* which is equal to or higher than the temperature control determination temperature value T ₀₁ (first set value: 127 ° C. in the present embodiment) and which is calculated by the target input speed calculator 13 (FIG. 2). Is 6400 rpm (highest input side rotation speed) or more, that is, whether or not these high oil temperature control conditions are satisfied is determined.

When these high oil temperature control conditions are satisfied,
In step S3, the high oil temperature control is performed to end this routine. If the high oil temperature control routine is not satisfied, the normal control is performed in step S4 to end this routine.

In step S3, as shown in FIG. 4, the maximum input rotation speed regulating unit 14 (FIG. 2) regulates the upper limit of the transmission target input rotation speed N _P ^*.
_PMAX is gradually reduced from 6400 rpm to 4700 rpm (set speed) every 100 rpm / sec, that is, the final limit line (final shift line) is gradually reduced. Further, the target gear ratio calculation unit 15
This maximum input speed N _PMAX, that is, the transmission target input speed whose upper limit is restricted by the final limit line, and the vehicle speed sensor 8
A target gear ratio is calculated based on the vehicle speed VSP detected by (FIGS. 1 and 2).

In step S4, the maximum input speed N _PMAX
That is, the final limit line is normally controlled, that is, 6400 rpm
Then, the target gear ratio calculation unit 15 (FIG. 2) determines the transmission target input rotational speed whose upper limit is regulated by the maximum input rotational speed N _PMAX and the vehicle speed VSP detected by the vehicle speed sensor 8 (FIGS. 1 and 2). The target gear ratio is calculated based on

When it is determined in step S1 that the high oil temperature control is not being performed, it is determined in step S5 whether or not the maximum input speed N _PMAX has reached a predetermined final limit line (final shift line). Number N _PMAX is 4700 rpm
Judgment was made up to.

When it is determined that the maximum input speed N _PMAX is not regulated to 4700 rpm, the high oil temperature control is performed in step S3, and this routine is finished. On the other hand, when it is determined that the maximum input rotation speed N _PMAX is restricted to 4700 rpm, in step S6,
It is determined whether the hydraulic oil temperature T _x detected by the oil temperature sensor 12 (FIGS. 1 and 2) is lower than a high oil temperature control release determination temperature value T ₀₂ (second set value: 110 ° C. in the present embodiment). To do. The high oil temperature control cancellation determination temperature value T ₀₂ is set to be less than the high oil temperature control ON determination temperature value T ₀₁ .

When it is determined that the operating oil temperature T _x is not lower than the high oil temperature control release determination temperature value T ₀₂ , the high oil temperature control is performed in step S3, and this routine ends. On the other hand, the operating oil temperature T _x is the high oil temperature control release determination temperature value T _02.
When it is determined that it is less than the above, normal control is restored in step S7, and this routine ends.

In step S7, the maximum input speed regulation unit
14 (FIG. 2), the transmission target input speed N_P ^*of
Maximum input speed N that regulates the upper limit_PMAX4700 rpm
To 6400 rpm every 100 rpm / sec
The control is resumed so that the normal control is resumed. Ma
Also, the target gear ratio calculation unit 15 determines that the maximum input speed N
_PMAXTransmission target input speed, the upper limit of which is regulated by
Vehicle speed VS detected by vehicle speed sensor 8 (FIGS. 1 and 2)
A target gear ratio is calculated based on P.

In this embodiment, by limiting the maximum input speed N _PMAX , the transmission target input speed N _P ^* is 4700 rpm even when the hydraulic oil temperature T _x is higher than the high oil temperature control determination temperature value T _01. If it is less than the target gear ratio calculation unit 1
5 (FIG. 2) maintains the gear ratio, so
Even when the high side signal is transmitted to the target input speed calculation unit 13 (Fig. 2) by the range switch 11 (Figs. 1 and 2), the engine braking as expected by the driver can be obtained, and the influence on the drivability is minimized. can do.
Further, the transmission target input speed N _P ^* is restricted to 4700 rpm or lower, which is lower than the maximum speed 6400 rpm in the normal control, to prevent the hydraulic oil temperature T _x from rising.

Further, according to this embodiment, during the high oil temperature control, the maximum input speed N _PMAX is changed from 6400 rpm to 4700 rpm.
It is possible to reduce the uncomfortable feeling of the driver by gradually lowering it.

[0037] Further, according to the present embodiment, a high after returning from an oil temperature control to the normal control, the working oil temperature T _x is higher than the oil temperature control cored determined temperature value T ₀₁ under high oil temperature control cancellation determination temperature value T _When it becomes less than ₀₂ , the normal gear change control is performed, so the oil temperature sensor 12
Considering the variations in the characteristics (FIGS. 1 and 2), hysteresis is provided between the start of high oil temperature control and the return to normal control, and hunting can be prevented.

Further, according to this embodiment, while the high oil temperature control is returned to the normal control, the maximum input speed N _PMAX is set to 4700r.
The driver's discomfort can be reduced by gradually increasing the speed from pm to 6400 rpm.

FIG. 5 is a flowchart of another embodiment of the shift control device for a continuously variable transmission according to the present invention. In this routine, the case where the downshift, that is, the gear ratio is increased when the normal control is shifted to the high oil temperature control is shown. First, in step S11, it is determined whether or not the control by the transmission controller 7 (FIGS. 1 and 2) is a transition from normal control to high oil temperature control.

When it is determined that it is not the time to shift from the normal control to the high oil temperature control, this routine is ended. On the other hand, when it is determined that it is time to shift from the normal control to the high oil temperature control, whether or not the downshift is performed in step S12, that is, the driver uses the M range switch 11 (FIGS. 1 and 2) to set the high side signal. Is transmitted to the target input speed calculator 13 (FIG. 2).

If it is determined that the downshift is not to be performed,
In step S13, the high oil temperature control is performed, and this routine ends. On the other hand, when it is determined that the downshift has been performed, the counter (not shown) incorporated in the transmission controller 7 (FIGS. 1 and 2) is reset to zero in step S14, and the process proceeds to step S15.

In step S15, it is determined whether the transmission target input speed N _P ^* is higher than 4700 rpm. When it is determined that the transmission target input rotation speed N _P ^* is not higher than 4700 rpm, the high oil temperature control is performed in step S13, and this routine ends. On the other hand, the transmission target input speed N _P ^* is 4700 rp
If it is determined that the value is higher than m, it is determined in step S16 whether or not the count of the counter (not shown) is 4 or more.

If the count of the counter (not shown) is less than 4, the maximum input speed N is reached in step S17.
_PMAX is

## EQU1 ## This maximum input rotation speed N _PMAX is controlled by the maximum input rotation speed regulating unit 14 (FIG. 2) so that N _PMAX = 6400-600n (n is the count of the counter). Then, the counter (not shown) is incremented by 1 (step S1).
8) and returns to step S16.

From step S15 to step S16
Then, the loop of steps S16 to S18 may be repeated three times.
And in these loops, the first loop
Maximum input speed N_PMAXIs set to 6400 rpm and the second
Maximum input speed N in loop _PMAXTo 5800 rpm
However, in the third loop, the maximum input speed N_PMAX520
Set to 0 rpm. Also, from step S18 to step S
Transmission target input speed N when returning to 16_P ^*, And
Transmission target input speed N at this time_P ^*Is the maximum input speed
N_PMAXEven if it is lower, the target transmission calculation unit 15
2) is the maximum input speed N determined in step S17_PMAXTo
Based on this, the gear ratio is calculated.

In step S16, the count of the counter (not shown) is 4 or more, that is, step S16.
When the loop of 16 to S18 has passed three times, step S
19, the transmission target input speed N _P ^* is 4700
Determine if it is above rpm. When it is determined that the transmission target input rotation speed N _P ^* is not higher than 4700 rpm, the high oil temperature control is performed in step S13, and this routine ends. On the other hand, if it is determined that the target transmission input rotation speed N _P ^* is higher than 4700 rpm, the downshift is prohibited in step S20, and this routine is ended. That is, after the predetermined number of times of control (four times in this embodiment) has elapsed, the transmission target input speed N _P
Do not perform shift control such that ^* exceeds 4700 rpm.

According to this embodiment, the transmission target input speed N _P ^* is 4700 r when the normal control is changed to the high oil temperature control.
When increasing the gear ratio of the continuously variable transmission so as to exceed pm, set the maximum input speed N _PMAX to 5400 from 6400 rpm.
800 rpm, 5800 rpm to 5200 rpm, 5
By gradually decreasing the speed from 200 rpm to 4700 rpm, for example, even when it is desired to decelerate the vehicle by using the engine brake before the corner, the gear ratio desired by the driver is reduced while reducing the influence on the drivability. Therefore, in addition to the actions and effects of the above-described embodiment, it is possible to obtain engine braking as expected by the driver.

FIG. 6 is a flowchart of another embodiment of the shift control device for a continuously variable transmission according to the present invention. In this routine, a case where a downshift, that is, a gear ratio is increased when shifting from the high oil temperature control (step S3 in FIG. 3) to the normal control (step S4 in FIG. 3) is shown. First, in step S21, the transmission controller 7
It is determined whether or not the control according to (FIGS. 1 and 2) is a transition from the high oil temperature control to the normal control.

When it is determined that it is not the time to shift from the high oil temperature control to the normal control, this routine is ended. On the other hand, when it is determined that it is time to shift from the high oil temperature control to the normal control, whether or not the downshift is performed in step S22, that is, the driver uses the M range switch 11 (FIGS. 1 and 2) to set the high side signal. Is transmitted to the target input speed calculator 13 (FIG. 2).

When it is determined that the downshift is not to be performed, this routine is terminated, and when it is determined that the downshift is to be performed, the counter incorporated in the transmission controller 7 (FIGS. 1 and 2) is determined in step S23. (Not shown) is reset to zero, and the process proceeds to step S24.

In step S24, it is determined whether the transmission target input speed N _P ^* is higher than 4700 rpm. When it is determined that the transmission target input speed N _P ^* is not higher than 4700 rpm, this routine is ended, and the transmission target input speed N _P ^* is set to 4700 rp.
When it is determined that the value is higher than m, it is determined in step S25 whether or not the count of the counter (not shown) is 2 or more.

When the count of the counter (not shown) is less than 2, the maximum input speed N is reached in step S26.
_PMAX is

## EQU00002 ## This maximum input rotation speed _N.sub.PMAX is controlled by the maximum input rotation speed regulation unit 14 (FIG. 2) so that _N.sub.PMAX = 5200 + 600n (n is the count of the counter). Then, the counter (not shown) is incremented by 1 (step S2
7) and returns to step S25.

The process proceeds from step S24 to step S25.
And the loop of steps S25 to S27 may be repeated twice.
And in these loops, the first loop
Maximum input speed N_PMAXIs set to 5200 rpm and the second
Maximum input speed N in loop _PMAXIs set to 5800 rpm
You.

In step S25, the count of the counter (not shown) is 2 or more, that is, step S25.
If the loop of 25 to S27 has passed twice, step S
28, the maximum input speed N _PMAX is 6400 rpm
Then, this routine ends. That is, after the predetermined number of times of control (two times in this embodiment) has elapsed, the shift control such that the transmission target input speed N _P ^* exceeds 6400 rpm is not performed.

According to this embodiment, the transmission target input speed N _P ^* is 4700 r when the high oil temperature control is changed to the normal control.
When increasing the gear ratio of the continuously variable transmission so as to exceed pm, set the maximum input speed N _PMAX from 5200 rpm to 5
By gradually increasing the speed from 800 rpm to 5800 rpm to 6400 rpm, for example, even when it is desired to decelerate the vehicle by using the engine brake in front of a corner, the influence on the drivability is reduced while the driver's desired effect is reduced. Since the gear ratio can be obtained, in addition to the actions and effects of the above-described embodiment, it is possible to obtain engine braking as expected by the driver.

In the embodiment described with reference to the flow charts of FIGS. 5 and 6, the high oil temperature control or the normal control is performed after the predetermined control number of times has passed. You may make it control.

When the shift control device for a continuously variable transmission according to the present invention enters the high oil temperature control from the normal control or returns from the high oil temperature control to the normal control, the driver opens the throttle opening TVO. Is operated or a high side signal is transmitted from the M range switch 11 (FIGS. 1 and 2), the shift control device for a continuously variable transmission according to the present invention performs the normal control. Further, when the shift control device of the continuously variable transmission according to the present invention returns from the high oil temperature control to the normal control, the driver shifts from the M range to the D range or the D range to the M range.
Even when shifting to the range, the shift control device for the continuously variable transmission according to the present invention performs the above-mentioned normal control.

When the shift control device for a continuously variable transmission according to the present invention enters the high oil temperature control from the normal control, the maximum input rotational speed N _PMAX, that is, the final limit line (final shift line) is changed from 6400 rpm to 4700 rpm. While gradually decreasing, the operating oil temperature T _x is the high oil temperature control release determination temperature value T _02.
Even when it becomes less than the above, the above-mentioned high oil temperature control is performed until the maximum input speed N _PMAX reaches 4700 rpm without returning to the above-mentioned normal control, and then it is judged whether or not to return to the normal control. The maximum input speed N _PMAX is 4700 rpm
When the hydraulic oil temperature T _x becomes lower than the high oil temperature control release determination temperature value T ₀₂ after the temperature reaches, the normal control is restored.

Further, when the shift control device for the continuously variable transmission according to the present invention returns from the high oil temperature control to the normal control, the working oil temperature T _x is higher than the high oil temperature control ON determination temperature value T _01. If so, the return to the normal control is canceled and the high oil temperature control is performed.

Further, when the shift control device for the continuously variable transmission according to the present invention enters the high oil temperature control from the normal control, the control according to the present invention is continued even when the driver shifts from the M range to the D range. . The reason is for protection when the driver shifts to the M range again with the hydraulic oil temperature T _x high. The condition for returning to normal control is the same as that for the M range, and in this case, the maximum input speed N _{PMAX is set} to 4
Return from 700 rpm to 6400 rpm at once. As described above, in the case of the D range, the final limit line is changed at one time when returning to the above-mentioned normal control. However, the input side rotation speed actually increases at one time when the throttle opening TVO is fully opened. This is the case of accelerating the vehicle. In such a case, when the driver wants to obtain the maximum acceleration, the driver feels a little uncomfortable, but the vehicle speed VSP becomes faster. Can be considered The control is continued even when the driver shifts from the D range to the M range.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a shift control device for a continuously variable transmission according to the present invention.

FIG. 2 is a schematic diagram of a shift control system of an embodiment of a shift control device for a continuously variable transmission according to the present invention.

FIG. 3 is a flowchart of an embodiment of a shift control device for a continuously variable transmission according to the present invention.

FIG. 4 is a shift diagram showing a manual range shift control in one embodiment of a shift control device for a continuously variable transmission according to the present invention.

FIG. 5 is a flowchart of another embodiment of the shift control device for a continuously variable transmission according to the present invention.

FIG. 6 is a flowchart of another embodiment of the shift control device for a continuously variable transmission according to the present invention.

[Explanation of symbols]

1 continuously variable transmission 2 torque converter 3 engine 4 output shaft 5 control valve 6 step motor 7 transmission controller 8 vehicle speed sensor 9 throttle opening sensor 10 D range switch 11 M range switch 12 oil temperature sensor 13 target input speed calculator 14 maximum input speed regulating section 15 a target speed ratio calculating unit 16 oil temperature warning light N _P ^* transmission (engine) target input revolution speed N _PMAX maximum input speed step step motor operation amount TVO throttle opening T _x oil temperature VSP Vehicle speed

Claims (5)

[Claims] 1. A shift control device for a continuously variable transmission having a manual range capable of manually changing a gear ratio by manually operating a select lever, wherein a manual range detecting means for detecting that the continuously variable transmission is in a manual range. An oil temperature detecting means for detecting the operating oil temperature of the continuously variable transmission, an input side rotational speed setting means for setting an input side rotational speed of the transmission suitable for the traveling condition of the vehicle, and the input side rotational speed The input side rotation speed regulating means for controlling the rotation speed below the maximum input side rotation speed during normal shift control to be equal to or lower than the set rotation speed, the continuously variable transmission is in the manual range, and the hydraulic oil temperature is equal to or higher than the first set value. Further, when the input side rotation speed is equal to or higher than the set rotation speed, a shift control means is provided for controlling the shift to a gear ratio such that the input side rotation speed is reduced to the set rotation speed. The shift control device for a continuously variable transmission according to symptoms. 2. The shift control means, during the shift control,
2. The shift control device for a continuously variable transmission according to claim 1, wherein the set rotation speed is gradually decreased from the maximum input side rotation speed. 3. The shift control means is configured to perform a normal shift control when the hydraulic oil temperature falls below a second set value below the first set value after the shift control. A shift control device for a continuously variable transmission according to claim 1. 4. The shift control means is configured to gradually increase the set rotation speed to the maximum input side rotation speed while changing from the shift control to the normal shift control. Shift control device for continuously variable transmission. 5. The shift control means, when shifting from the normal shift control to the shift control, when increasing the gear ratio of the continuously variable transmission such that the input side rotation speed exceeds the set rotation speed, The side rotation speed is gradually reduced from the maximum input rotation speed to the set rotation speed, and after a predetermined time or a predetermined control number has elapsed, the input rotation speed of the continuously variable transmission is set to exceed the set rotation speed. If the gear ratio is not increased and / or the gear ratio of the continuously variable transmission is increased so that the input side rotation speed exceeds the set rotation speed during the shift control from the shift control to the normal shift control, 5. The input side rotation speed is gradually increased from the set rotation speed to the maximum input side rotation speed, and normal shift control is performed after a predetermined time or a predetermined control number has elapsed. Which one of A shift control device for a continuously variable transmission according to claim 1.