JP3322110B2 - Transmission control device for continuously variable 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 device applied to a continuously variable transmission such as a belt-type continuously variable transmission.

[0002]

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

[0003]

However, such a speed change control device for a continuously variable transmission is operated by heating the speed change control device of the continuously variable transmission due to heat generation of an engine. Since the gear ratio is reduced when the oil temperature increases, no inconvenience occurs in the automatic gear shift mode, that is, in the drive range (D range). However, manual gear shift that enables the gear ratio to be manually shifted by manual operation of the select lever. Mode, manual range (M range)
When this is applied to a shift control device of a continuously variable transmission having the above, a problem arises. That is, when downshifting with a continuously variable transmission having an M range, that is, when increasing the gear ratio, the driver often expects a strong engine brake, which is described in Japanese Patent Application Laid-Open No. 62-286847. If the gear ratio is suddenly reduced when the operating oil temperature is high, as in a transmission control device for a continuously variable transmission, the driver will not be able to obtain engine braking as expected by the driver, and the driver will feel uncomfortable.

Further, the heat generated by the transmission control device itself of the continuously variable transmission depends on the input-side rotation speed.
In the case of the transmission control device for a continuously variable transmission described in Japanese Patent No. 86847, even if it is not necessary to change the gear ratio due to the low input-side rotation speed, there is a risk that the operating oil temperature will increase and the gear will be shifted. is there.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shift control device for a continuously variable transmission capable of effectively preventing a rise in operating oil temperature of the continuously variable transmission while minimizing the influence on drivability.

[0006]

According to a first aspect of the present invention, there is provided a transmission control apparatus for a continuously variable transmission having a manual range in which a gear ratio can be manually shifted by manually operating a select lever. In the control device, 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, and a transmission suitable for the traveling conditions of the vehicle. Input-side rotational speed setting means for setting an input-side rotational speed; input-side rotational speed regulating means for restricting the input-side rotational speed to a set rotational speed less than a maximum input-side rotational speed during normal speed change control; When the step transmission is in a manual range, the hydraulic oil temperature is equal to or higher than a first set value, and the input-side rotational speed is equal to or greater than the set rotational speed, the input-side rotational speed is up to the set rotational speed. Low It is characterized in the provision of the speed change control means for shifting control to the speed ratio as.

According to a second aspect of the present invention, there is provided a transmission control device for a continuously variable transmission having a manual range in which a gear ratio can be manually shifted by manually operating a select lever. Manual range detection means for detecting that the transmission is in the manual range, oil temperature detection means for detecting the operating oil temperature of the continuously variable transmission, and input-side rotation speed of the transmission suitable for the traveling conditions of the vehicle. Input-side rotational speed setting means, a maximum input rotational speed regulating means for regulating an upper limit of the maximum input rotational speed inputted to the continuously variable transmission, and a maximum input rotational speed less than the maximum input rotational speed regulated as an upper limit during the normal shift control. When the set speed is determined, the continuously variable transmission is in a manual range, the operating oil temperature is equal to or higher than a first set value, and the input side speed is equal to or higher than the set speed. It is characterized in the provision of the speed change control means for shifting control to the gear ratio that decreases the maximum input speed for regulating the high input rotational speed regulating means to said set speed.

According to a third aspect of the present invention, there is provided a transmission control apparatus for a continuously variable transmission, wherein the maximum input-side rotational speed is set during the shift control. It is characterized in that the rotation speed is gradually reduced to the rotation speed.

According to a fourth aspect of the present invention, there is provided a transmission control apparatus for a continuously variable transmission according to the second aspect of the present invention, wherein the hydraulic oil temperature is controlled after the shift control. When the value is less than a second set value lower than the first set value, the normal speed change control is performed.

According to a fifth aspect of the present invention, in addition to the shift control device for a continuously variable transmission according to the fourth aspect of the present invention, the maximum speed change control during the shift from the shift control to the normal shift control is provided. The input-side rotation speed is gradually increased to a maximum input rotation speed that is regulated as an upper limit during the normal shift control.

[0011]

According to the shift control device for a continuously variable transmission according to the first aspect of the present invention, the continuously variable transmission is in a manual range, the hydraulic oil temperature is equal to or higher than a first set value, and If the rotation speed is equal to or higher than the set rotation speed, the speed is controlled to a speed ratio that reduces the input-side rotation speed to the set rotation speed.

By regulating the input-side rotational speed in this way, even if the hydraulic oil temperature is equal to or higher than the first set value, if the input-side rotational speed is equal to or lower than the set rotational speed, the gear ratio is maintained by the shift control means. Therefore, even when the driver increases the gear ratio in the manual range, engine braking as expected by the driver can be obtained, and the influence on the drivability can be minimized. Further, since the input-side rotational speed is regulated to be equal to or lower than the set rotational speed, an increase in hydraulic oil temperature is prevented.

According to the second aspect of the present invention, the continuously variable transmission is in the manual range, the operating oil temperature is equal to or higher than the first set value, and the input-side rotational speed is adjusted. Is greater than or equal to the set rotation speed, the speed is changed to a speed ratio that reduces the maximum input rotation speed regulated by the maximum input rotation speed regulation means to the set rotation speed.

As described above, since the maximum input speed input to the continuously variable transmission is regulated, even if the operating hot water temperature is equal to or higher than the first set value, if the input side speed is equal to or lower than the set speed, the speed change is performed. Since the speed ratio is maintained by the control means, even when the driver increases the speed ratio in the manual range, engine braking as expected by the driver can be obtained, and the influence on drivability can be minimized. Further, since the input-side rotational speed is regulated to be equal to or lower than the set rotational speed, an increase in hydraulic oil temperature is prevented.

According to the third aspect of the present invention, during the shift control by the shift control means, the set number of revolutions is gradually decreased from the maximum input side number of revolutions. By gradually changing the set rotation speed in this way, in addition to the operation and effect according to the second aspect, there is an operation and effect that a driver's discomfort can be reduced.

According to a fourth aspect of the present invention, after the shift control by the shift control means, if the hydraulic oil temperature becomes lower than the second set value lower than the first set value, it is normal. Shift control is performed. The hysteresis is provided between the start of the shift control by the shift control unit and the return to the normal shift control in consideration of the variation in the characteristics of the oil temperature detecting unit. In addition to the functions and effects according to the above, there are functions and effects of preventing hunting.

According to the shift control device for a continuously variable transmission according to the fifth aspect of the present invention, the set speed is gradually increased to the maximum input speed while the speed change control means changes from the speed change control to the normal speed change control. . By gradually changing the set rotation speed in this way, in addition to the operation and effect according to the fourth aspect, there is an operation and effect that a driver's discomfort can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment 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 denoted 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, a continuously variable transmission 1 receives power from an engine 2 via a torque converter 3, performs a stepless change in speed with respect to this input, and transmits the input to an output shaft 4.

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

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

The target input rotational speed calculating section 13 corresponds to the input side rotational speed setting means in the present invention. When a signal from the D range switch 10 is input, the target input rotational speed calculating section 13 determines the vehicle speed sensor 8 and the speed based on the D range map. From the vehicle speed VSP and the throttle opening TVO detected by the throttle opening sensor 9, a transmission target input rotation speed N _P ^* (or an engine target rotation speed) suitable for running conditions is obtained. When a high-side signal or a low-side signal is input from the M range switch, 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 rotational speed N _P ^* (or an engine target rotational speed) suitable for the conditions is obtained.

Maximum input (engine) rotation speed regulating unit 14
Is equivalent to the input-side rotational speed regulating means in the present invention, and M
In accordance with signals from the range switch 10 and the oil temperature sensor 12, the maximum input rotation speed is regulated to a predetermined rotation speed or less as described later.

The target gear ratio calculating section 15 corresponds to a gear shift control means in the present invention, and calculates a target gear ratio in accordance with signals from the vehicle speed sensor 8 and the maximum input rotational speed regulating section 14,
The step motor operation amount Step is output.

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

The operation of this embodiment will be described. FIG. 3 is a flowchart of one 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 according to one embodiment of a shift control device for a continuously variable transmission according to the present invention. FIG.

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

[0027] In step S2, the inputted high-side or low-side signals from the M range switch 11 (FIGS. 1 and 2), the oil temperature sensor 12 working oil temperature T _x which is detected by (FIGS. 1 and 2) high oil The transmission target input rotation 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 calculated by the target input rotation speed calculation unit 13 (FIG. 2). Is higher than or equal to 6400 rpm (maximum input side rotation speed), that is, whether or not these high oil temperature control conditions are satisfied.

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

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

In step S4, the maximum input rotational speed N _PMAX
That is, the final limit line is normally controlled, that is, 6400 rpm.
The target gear ratio calculation unit 15 (FIG. 2) calculates the transmission target input rotation speed whose upper limit is regulated by the maximum input rotation 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 being performed, in step S5, it is determined whether or not the maximum input rotational speed NPMAX has reached a predetermined final limit line (final shift line), that is, the maximum input rotational speed. Number NPMAX is 470
It is determined whether or not the rotation is restricted to 0 rpm.

If it is determined that the maximum input rotational speed N _PMAX is not restricted to 4700 rpm, the high oil temperature control is performed in step S3, and this routine ends. On the other hand, when it is determined that the maximum input rotation speed N _PMAX has been regulated to 4700 rpm, in step S6,
An oil temperature sensor 12 (FIG. 1 and 2) working oil temperature T _x which is detected by the high oil temperature control cancellation determination temperature value T _02: determines whether less than (the second set value 110 ° C. in this embodiment) I do. The high oil temperature control release determination temperature value _{T02 is set} to be lower than the high oil temperature control ON determination temperature value _T01 .

[0033] When it is determined that the working oil temperature T _x is not less than the high oil temperature control cancellation determination temperature value T _02, performs the high oil temperature control in the step S3, the routine ends. On the other hand, the operating oil temperature _Tx becomes the high oil temperature control release determination temperature value _T02.
If it is determined that it is less than the normal control, the routine returns to the normal control in step S7, and this routine ends.

In step S7, the maximum input rotational speed regulating section
14 (FIG. 2), the transmission target input speed N_P ^*of
Maximum input speed N that regulates the upper limit_PMAX4700 rpm
From 100 to 6400 rpm every 100 rpm / sec
The control is performed so as to raise the pressure, and the control returns to the normal control. Ma
In addition, the target speed ratio calculating section 15 calculates the maximum input rotational speed N
_PMAXThe transmission 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 regulating the maximum input rotation speed N _PMAX , the transmission target input rotation speed N _P ^* is 4700 rpm even when the operating oil temperature T _x is equal to or higher than the high oil temperature control ON determination temperature value T _01. If it is less than the target gear ratio calculation unit 1
5 (FIG. 2), the gear ratio is maintained,
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), engine braking as expected by the driver can be obtained, and the influence on drivability is minimized. can do.
Also, to prevent an increase in the working oil temperature T _x by regulating the transmission target input revolution speed N _P ^* below lower than the maximum rotational speed 6400rpm for normal control 4700 rpm.

According to the present embodiment, during the high oil temperature control, the maximum input rotational speed N _PMAX is changed from 6400 rpm to 4700 rpm.
By gradually lowering it, the driver's uncomfortable feeling can be reduced.

[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 the value is} less than ₀₂ , the normal shift control is performed.
Considering the variation in the characteristics of FIGS. 1 and 2, hysteresis is provided between the time when the high oil temperature control is started and the time when the control is returned to the normal control, and hunting can be prevented.

According to the present embodiment, the maximum input rotational speed N _PMAX is set to 4700r while the control is returned from the high oil temperature control to the normal control.
By gradually increasing the speed from pm to 6400 rpm, the driver's discomfort can be reduced.

FIG. 5 is a flowchart of another embodiment of the shift control device for a continuously variable transmission according to the present invention. This routine shows a case where a downshift is made, that is, the gear ratio is increased when the normal control is shifted to the high oil temperature control. First, in step S11, as described in step S2 in FIG. 3 of the embodiment, a look at whether working oil temperature T _x is the high oil temperature control cored determined temperature value T01 or more, the transmission controller 7 (FIG. 1 It is determined whether the control according to 2) is a transition from the normal control to the high oil temperature control.

If it is determined that it is not time to shift from the normal control to the high oil temperature control, this routine ends. On the other hand, if it is determined that it is time to shift from the normal control to the high oil temperature control, it is determined in step S12 whether or not the downshift has been performed, that is, the driver operates the M range switch 11 (FIGS. Is transmitted to the target input rotation speed calculation unit 13 (FIG. 2).

If it is determined that there is no downshift,
This routine ends. On the other hand, when it is determined that the downshift has occurred, in step S14, a counter (not shown) built in the transmission controller 7 (FIGS. 1 and 2) is reset to zero, and the process proceeds to step S15.

[0042] In step S15, the transmission target input revolution speed _N ^{p *} is determined whether the above 4700 rpm. When the transmission target input revolution speed N _p ^* is determined not to be above 4700rpm, the routine ends. In contrast, the transmission target input revolution speed _N ^{p *} 47
If it is determined that the rotation speed is higher than 00 rpm, it is determined in step S16 whether 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 rotational speed N is determined in step S17.
_PMAX

The maximum input rotational speed N _PMAX is controlled by the maximum input rotational speed regulating unit 14 (FIG. 2) so that N _PMAX = 6400−600n (n is the count of the counter). Next, the counter (not shown) is incremented by 1 (step S1).
8) Return to step S16.

The process proceeds from step S15 to step S16.
And the loop of steps S16 to S18 has passed three times.
In these loops, the first loop
Maximum input speed N_PMAXTo 6400 rpm, the second time
Maximum input speed N in loop _PMAXTo 5800 rpm
In the third loop, the maximum input speed N_PMAXTo 520
0 rpm. Also, from step S18 to step S
When returning to 16, the transmission target input speed N_P ^*, And
The transmission target input speed N at this time_P ^*Is the maximum input speed
N_PMAXEven if it is lower, the target transmission calculating unit 15 (FIG.
2) is the maximum input rotation speed N obtained in step S17._PMAXTo
The gear ratio is determined based on the gear ratio.

In step S16, the count of the counter (not shown) is 4 or more, that is, in step S16.
If the loop from 16 to S18 has passed three times, step S
At 19, the transmission target input rotation speed N _P ^* is 4700.
It is determined whether the speed is higher than rpm. If it is determined that the transmission target input rotation speed N _P ^* is not higher than 4700 rpm, in step S13, the high oil temperature control is performed, and this routine ends. When the transmission target input revolution speed N _P ^* is determined to be above 4700rpm against it, it prohibits downshifting in step S20, the routine ends. That is, after a predetermined number of control operations (four in this embodiment) has elapsed, the transmission target input rotation speed N _P
^The shift control such that ^* exceeds 4700 rpm is not performed.

According to the present embodiment, the target input rotation speed N _P ^* of the transmission is 4700 r at the time of transition from the normal control to the high oil temperature control.
When the speed ratio of the continuously variable transmission is increased so as to exceed pm, the maximum input rotational speed N _PMAX is increased from 6400 rpm to 5
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 using the engine brake just before the corner, the desired gear ratio of the driver can be reduced while reducing the influence on the drivability. Therefore, in addition to the functions and effects of the above embodiment, it is possible to obtain the engine brake 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. This routine shows a case where a downshift has been made, that is, the gear ratio has been increased, when shifting from the high oil temperature control (step S3 in FIG. 3) to the normal control (step S4 in FIG. 3). First, in step S21, as described in step S6 in FIG. 3 of the embodiment, the oil temperature sensor 12 detected actuated hot water T _x is the high oil temperature control cancellation determination temperature value (FIG. 1 and 2) T02 ( (2nd set value: 110 ° C. in this embodiment), it is determined whether or not the control by the transmission controller 7 (FIGS. 1 and 2) is a transition from the hot water temperature to the normal control. .

If it is determined that it is not time to shift from the high oil temperature control to the normal control, this routine ends. On the other hand, if it is determined that it is time to shift from the high oil temperature control to the normal control, it is determined in step S22 whether or not the downshift has been performed, that is, the driver uses the M range switch 11 (FIGS. Is transmitted to the target input rotation speed calculation unit 13 (FIG. 2).

If it is determined that downshifting is not to be performed, this routine is terminated. If it is determined that downshifting has been performed, in step S23, a counter built in the transmission controller 7 (FIGS. 1 and 2) is used. (Not shown) is reset to zero, and the process proceeds to step S24.

In step S24, it is determined whether or not the transmission target input speed N _P ^* is higher than 4700 rpm. If it is determined that the transmission target input rotation speed N _P ^* is not higher than 4700 rpm, this routine is terminated, whereas the transmission target input rotation speed N _P ^* is 4700 rpm.
If it is determined that it is above m, it is determined in step S25 whether the count of the counter (not shown) is 2 or more.

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

The maximum input rotation speed N _PMAX is controlled by the maximum input rotation speed regulation unit 14 (FIG. 2) so that N _PMAX = 5200 + 600n (n is the count of the counter). Next, the counter (not shown) is incremented by 1 (step S2).
7), and return to step S25.

The process proceeds from step S24 to step S25.
That the loop of steps S25 to S27 has passed twice.
In these loops, the first loop
Maximum input speed N_PMAXAt 5200 rpm, the second time
Maximum input speed N in loop _PMAXTo 5800 rpm
You.

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

According to the present embodiment, the target input rotation speed N _P ^* of the transmission is 4700 r at the time of transition from the high oil temperature control to the normal control.
When the speed ratio of the continuously variable transmission is increased so as to exceed pm, the maximum input rotational speed N _PMAX is increased from 5200 rpm to 5
By gradually increasing the speed from 800 rpm to 5400 rpm to 6400 rpm, for example, even when it is desired to decelerate the vehicle using an engine brake just before a corner, it is possible to reduce the influence on the driving performance while reducing the influence on the driving performance. Since the gear ratio can be obtained, engine braking as expected by the driver can be obtained in addition to the functions and effects of the above embodiment.

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 a predetermined number of controls have been performed. Control may be performed.

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

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. high oil temperature control released during working oil temperature T _x which is gradually reduced determined temperature value T ₀₂
Even if it becomes less than the above, the control does not return to the normal control, the high oil temperature control is performed until the maximum input rotational speed N _PMAX reaches 4700 rpm, and thereafter, it is determined whether or not to return to the normal control. Note that the maximum input rotation speed N _PMAX is 4700 rpm
When the working oil temperature T _x after reaching falls below the high oil temperature control cancellation determination temperature value T ₀₂ To return to the normal control.

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 hydraulic oil temperature _Tx becomes higher than the high oil temperature control ON determination temperature value _T01. If it does, the return to the normal control is canceled and the high oil temperature control is performed.

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 control according to the present invention is continued even when the driver shifts from the M range to the D range. . The reason is to protect the driver from shifting to the M range again in a state where the operating oil temperature _Tx is high. The condition for returning to the normal control is the same as in the case of the M range. In this case, the maximum input rotational 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, when returning to the normal control, the final limit line is changed at one time, but the fact that the input-side rotation speed is increased at one time is only when the throttle opening TVO is fully opened. This is the case where the vehicle is accelerated. In such a case, the driver wants to obtain the maximum acceleration. Therefore, the driver feels some discomfort, but the vehicle speed VSP becomes faster. Can be considered. Control is continued even when the driver shifts from the D range to the M range.

[Brief description of the 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 one embodiment of a shift control device for a continuously variable transmission according to the present invention.

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

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

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

[Explanation of symbols]

Reference Signs List 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 calculation unit 14 Maximum input rotation speed regulation unit 15 Target gear ratio calculation unit 16 Oil temperature warning light N _P ^* Transmission (engine) target input rotation speed N _PMAX Maximum input rotation speed Step Step motor operation amount TVO Throttle opening T _x Oil temperature VSP Vehicle speed

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI F16H 63:06 F16H 63:06

Claims (5)

(57) [Claims] 1. A shift control device for a continuously variable transmission having a manual range in which a gear ratio can be manually shifted by manual operation of 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 a hydraulic 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 running conditions of the vehicle; An input-side rotational speed regulating means for regulating the rotational speed to be equal to or less than a set rotational speed less than the maximum input-side rotational speed during the normal speed change control; And, when the input-side rotational speed is equal to or higher than the set rotational speed, a speed-change control unit that controls a speed change to a speed ratio such that the input-side rotational speed is reduced to the set rotational speed is provided. The shift control device for a continuously variable transmission according to symptoms. 2. A shift control device for a continuously variable transmission having a manual range in which a gear ratio can be manually shifted by manual operation of a select lever, wherein a manual range detecting means for detecting that the continuously variable transmission is in a manual range. Oil temperature detecting means for detecting the operating oil temperature of the continuously variable transmission; input-side rotational speed setting means for setting the input-side rotational speed of the transmission suitable for the traveling conditions of the vehicle; A maximum input rotation speed regulating means for regulating the upper limit of the maximum input rotation speed to be inputted, and a set rotation speed less than the maximum input rotation speed which is regulated as an upper limit during the normal speed change control, and the continuously variable transmission has a manual range. When the hydraulic oil temperature is equal to or higher than a first set value and the input-side rotation speed is equal to or higher than the set rotation speed, the maximum input rotation speed regulated by the maximum input rotation speed regulating means. The shift control device for a continuously variable transmission, characterized by comprising a shift control means for shifting control to the gear ratio that decreases until the set rotational speed. 3. The shift control unit according to claim 2, wherein the shift control is performed during the shift control.
3. The shift control device for a continuously variable transmission according to claim 2, wherein the maximum input-side rotation speed is gradually reduced to the set rotation speed. 4. The apparatus according to claim 1, wherein the shift control means performs a normal shift control when the operating oil temperature falls below a second set value lower than the first set value after the shift control. The shift control device for a continuously variable transmission according to claim 2. 5. The speed change control means, while changing from the speed change control to the normal speed change control, gradually increases the maximum input-side rotational speed to a maximum input speed restricted as an upper limit during the normal speed change control. 5. The shift control device for a continuously variable transmission according to claim 4, wherein: