JPH1113873A - Transmission control device for automatic transmission - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress an increase in manufacturing cost while preventing an increase in oil temperature during traveling in a manual mode. A shift mode switching means for selectively switching between an automatic shift mode and a manual mode of an automatic transmission having a torque converter, and a shift speed setting means for setting a shift speed when a manual mode is selected. 51; an oil temperature detecting means 52 for detecting the oil temperature of the automatic transmission 10; and a shift pattern setting means 53 comprising a normal oil temperature shift pattern and a high oil temperature shift pattern. When the automatic shift mode is selected, while the oil temperature exceeds the predetermined value, the shift pattern switching means 54 for selecting a high oil temperature shift pattern, and when the manual mode is selected, the oil temperature is changed to a predetermined value. During the period in which the manual gear shifting is prohibited, the mode is switched to the automatic shifting mode. And an oil temperature rise suppressing means 56 for replacement.

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 for an automatic transmission, and more particularly to an improvement in a shift control device capable of switching between an automatic shift mode and a manual mode.

[0002]

2. Description of the Related Art In a shift control device for an automatic transmission employed in a vehicle, a shift speed (gear ratio) is determined according to driving conditions such as a vehicle speed VSP and a throttle opening TVO (or an accelerator opening).
In addition to the automatic transmission mode that determines the speed, some manual transmissions have a manual mode that selects a predetermined gear ratio in accordance with the driver's gear shifting operation, similarly to a conventional manual transmission. Known is, for example, the one disclosed in Japanese Patent Application Laid-Open No. 8-321774.

[0003] In the manual mode of the automatic transmission, when the high-load operation exceeds a predetermined time, the upshift is forcibly performed based on a shift map (shift line) for the manual mode set in advance, and the driving is performed. This is to prevent overload of the system.

In the automatic transmission mode of the automatic transmission,
If the oil temperature rises excessively due to slippage of the torque converter, etc., a downshift or lockup is performed based on a shift map set in advance to suppress the rise in oil temperature and ensure durability of the automatic transmission. Are known.

[0005]

However, in the above-mentioned conventional automatic transmission, the manual mode is selected and H
If a high load operation is performed while maintaining the gear position on the i-side (speed ratio = small), the oil temperature may rise excessively due to slippage of the torque converter. For each mode, it is necessary to prepare a shift map when the oil temperature rises, so that there is a problem that the storage capacity of the control device is increased and the manufacturing cost is increased due to the setting of the shift map.

Accordingly, the present invention has been made in view of the above-mentioned problems, and has been made in the manual mode of an automatic transmission.
An object of the present invention is to reliably prevent an excessive increase in oil temperature and to suppress an increase in manufacturing cost.

[0007]

As shown in FIG. 10, the first invention is an automatic transmission 10 connected to an engine via a torque converter 12, an automatic transmission mode of the automatic transmission 10, and a manual mode. Shift mode switching means 50 for selectively switching between
When a manual mode is selected, a gear position setting means 51 for setting a gear position according to a driver's operation, an oil temperature detecting means 52 for detecting an oil temperature of the automatic transmission 10, The shift pattern setting means 53, which is constituted by a plurality of shift patterns of a normal oil temperature shift pattern and a high oil temperature shift pattern, and the oil temperature when the shift mode switching means 50 selects the automatic shift mode. While the gear ratio exceeds a predetermined value, in the shift control device for an automatic transmission, which includes a shift pattern switching unit 54 for selecting the shift pattern for high oil temperature, the shift mode switching unit 50 selects the manual mode. At this time, while the oil temperature exceeds the predetermined value, at least the manual shift prohibiting means 5 for prohibiting the upshift by the gear position setting means 51
5, and an oil temperature rise suppressing means 56 for switching to the high oil temperature shift pattern in the automatic shift mode during a period in which the manual shift inhibiting means 55 inhibits manual shifting.

According to a second aspect of the present invention, in the first aspect, the manual shift inhibiting means 55 includes an upshift and a downshift by the shift speed setting means 51 while the oil temperature exceeds a predetermined value. Is prohibited.

According to a third aspect of the present invention, in the first aspect, the torque converter 12 includes a lock-up clutch 12a, and the oil temperature rise suppressing means 56 includes a normal oil temperature lock-up pattern and a high oil temperature. The lock-up pattern for high oil temperature is selected while the lock-up pattern setting means 57 composed of a plurality of lock-up patterns and the manual gear shift prohibition means 55 inhibits the manual gear shift. In the case of (1), a lock-up pattern switching means 58 for selecting the lock-up pattern for normal oil temperature is provided.

In a fourth aspect based on the third aspect, the lock-up pattern for high oil temperature has a larger load than the lock-up pattern for normal oil temperature, and the lock-up clutch is used in a region where the vehicle speed is low. Is set to be performed.

In a fifth aspect based on the third aspect, the oil temperature rise suppression means 56 selects the high oil temperature lock-up pattern by the lock-up pattern switching means 58 and then controls the lock-up clutch. When the fastening is not performed, a downshift means 59 for forcibly downshifting is provided.

[0012]

Accordingly, the first aspect of the present invention is that when the oil temperature detected in the manual mode is a high oil temperature exceeding a predetermined value, the manual shift by the gear position setting means is prohibited, and Since it is possible to switch to the automatic shift mode based on the shift pattern, if the vehicle is traveling while selecting the Hi gear in the manual mode, the downshift is automatically performed when the shift mode is switched to the high oil temperature shift pattern in the automatic shift mode. Thus, the slip rate of the torque converter can be reduced to promote a decrease in oil temperature, and if the oil temperature falls below a predetermined value,
Returning to the manual mode again from the gear position at that time, manual shifting becomes possible, and it is possible to suppress an increase in oil temperature in the manual mode without impairing drivability,
At the time of high oil temperature, even in the manual mode, the shift pattern for the high oil temperature in the automatic transmission mode is used, so that it is not necessary to create the shift pattern for the high oil temperature in the manual mode. It is possible to prevent the manufacturing cost from increasing due to the increase and the setting of a large number of shift patterns.

According to the second aspect of the present invention, the downshift is prohibited in addition to the upshift at the time of high oil temperature, so that the driver can easily recognize the high oil temperature state of the automatic transmission, and the special oil condition can be obtained. There is no need to provide warning means.

According to a third aspect of the present invention, a manual speed change is restricted at a high oil temperature, and a lock-up pattern for a high oil temperature is selected and lock-up control is started. It is possible to reliably suppress the rise in oil temperature due to slippage of the oil, and to quickly cool the raised oil temperature to below a predetermined value to improve the durability of the automatic transmission and to lock the oil at high oil temperature. Since only setting up patterns can prevent a significant increase in manufacturing cost, lock-up control using the lock-up pattern for high oil temperature ends when the oil temperature falls below a predetermined value and the normal manual mode Since it is possible to return to, the driving performance is not impaired.

According to a fourth aspect of the present invention, the high oil temperature lock-up pattern is set such that the lock-up clutch is engaged in a region where the load is larger than the normal oil temperature lock-up pattern and the vehicle speed is low. Therefore, by expanding the lock-up region, slippage of the torque converter can be quickly prevented, and reduction of the oil temperature can be promoted.

According to a fifth aspect of the present invention, if the lockup clutch is not engaged after the high oil temperature lockup pattern is selected by the lockup pattern switching means, the downshift is forcibly performed again. It can be expected to enter the lock-up region, and by performing lock-up after the forced downshift, slippage of the torque converter can be prevented and the oil temperature can be reliably reduced. If the lockup is not performed even after the forced downshift, the mode is switched to the automatic shift mode based on the high oil temperature shift pattern, so that the downshift is automatically performed according to the shift pattern, and lockup is not possible. Even in this case, the slip ratio of the torque converter can be reduced to promote a decrease in the oil temperature, and the durability of the automatic transmission can be ensured.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an automatic transmission mode in which the gear ratio (or gear stage, hereinafter the same) is automatically changed according to the driving state of the vehicle, and an arbitrary gear ratio can be selected according to the operation of the driver. 1 shows an automatic transmission having a manual mode, and shows a torque converter 12 having a lock-up clutch 12a.
The automatic transmission 10 connected to the engine 11 through
The gear ratio is changed in accordance with a command from the shift control controller 1. Here, assuming that the automatic transmission 10 is configured with four speeds, the gear ratio is changed to a gear ratio corresponding to the GEAR position commanded by the shift control controller 1. Shift gears.

The shift control controller 1 is mainly composed of a microcomputer, and as shown in FIG.
A signal from the shift switch 2 according to the operation of the shift lever 3 operated by the driver is read, and the vehicle speed VSP from the vehicle speed sensor 7 and the opening of the throttle valve (not shown) from the throttle opening sensor 6 are read as the driving conditions of the vehicle. The operation amount of the TVO or the accelerator pedal is read, the speed ratio is determined based on a preset shift map (shift line), and the GEAR position corresponding to the speed ratio is set to the automatic transmission 10.
And a shift map for normal oil temperature and a shift map for rising oil temperature in a preset automatic shift mode based on the oil temperature Temp of the automatic transmission 10 detected by the oil temperature sensor 9. To perform control as described later.

The shift map of the automatic shift mode and the manual mode are respectively stored in storage means (not shown) of the shift control controller 1, and the shift maps of the automatic shift mode are as shown in FIGS. A shift map for normal oil temperature and a shift map for high oil temperature are preset.

In order to select one of these shift modes, the selector switch 2 of the shift lever 3 has an "H" type gate as shown in FIG. UP switch 4 ("+" in the figure) and DOWN switch 5 for manual shifting in addition to the range
The shift mode is switched from the automatic shift mode to the manual mode by operating the shift lever 3 from the D range position in FIG. 1 to the left side in the figure.

In this manual mode, the shift speed is sequentially changed relatively in accordance with the stroke of the shift lever 3 in the front-rear direction (vertical direction in FIG. 1). When the shift lever 3 is operated to the "+" side, The automatic transmission 10 is instructed to upshift from the current gear, and when the shift lever 3 is operated to the “−” side, it is instructed to downshift from the current gear.

In the automatic shifting mode of the present embodiment,
"D" range using 1st to 4th speed, "D3" range using 1st to 3rd speed, and "D" range using 1st to 2nd speed
It is configured to be able to select one of a “2” range and a “D1” range using only the first speed.

Next, an example of the control performed by the shift control controller 1 is shown in a flowchart of FIG. 2 and will be described in detail with reference to this flowchart. This flowchart is executed every predetermined time, for example, every 10 msec.

First, at step S1, the oil temperature Temp of the automatic transmission 10 detected by the oil temperature sensor 8 is read, and then at step S2, it is determined whether or not the detected oil temperature Temp is equal to or higher than a predetermined oil temperature Temphi. If the detected value is equal to or higher than the predetermined oil temperature temphi, the automatic transmission 1
It is determined that the oil temperature Temp of 0 has risen excessively, and the process proceeds to the processing after step S2, while the detected value is equal to the predetermined oil temperature temp.
If it is less than phi, the process ends.

In step S3, the shift mode MODE selected by the driver is read from the signal of the selector switch 2. In FIG. 1, if the shift lever 3 is at the position "D-D1," the automatic shift mode is set. = A, and if it is on the “+” or “−” side, MODE = M because it is a manual mode in which shifting is performed manually. At the same time, the shift speed k currently set in the automatic transmission 10 is read. Note that the command value G from the transmission control controller 1 is
EAR = gear k.

Next, in step S4, it is determined whether or not the current shift mode MODE is the manual mode M. If the current shift mode MODE is the manual mode (MODE = M), the process proceeds to step S4.
5 to step S10, while the automatic transmission mode (MO
If DE = A), the process proceeds to step S11 and subsequent steps.

In steps S5 and S7, it is determined whether or not the shift lever 3 has been operated to the "+" or "-" side.
A state in which neither “+” nor “−” is operated,
That is, when maintaining the current gear stage k, the process proceeds to step S9, and the current gear stage k is substituted into the variable i. On the other hand, if it has been operated to either "+" or "-", the process proceeds to step S8, in which the current gear stage k is fixed and the oil temperature Temp exceeds a predetermined value, so that manual gear shifting is performed. Ban.

In step S10, the shift range corresponding to the current shift stage k (= i) is substituted for a variable j.

Here, the relationship between the shift speed k in the manual mode and the shift range j is as follows: shift speed k = 1 → shift range j = 1 shift speed k = 2 → shift range j = 2 shift speed k = 3 → shift range j = 3 shift speed k = 4 → shift range j = 4. Then, the process proceeds to step S12.

On the other hand, if it is determined in step S4 that the automatic shift mode is set, the flow advances to step S11 to substitute the currently set shift range into a variable j.

Here, the shift range j in the automatic shift mode
Is set as D1 range → shift range j = 1 D2 range → shift range j = 2 D3 range → shift range j = 3 D range → shift range j = 4, and then proceeds to step S12.

In step S12, the above-mentioned step S10
Alternatively, the shift range j set from the shift speed k in the manual mode or the range in the automatic shift mode in step S11.
3 to 4 of the shift maps in the automatic shift mode based on
The shift map for high oil temperature shown in FIG. 6B is selected.
That is, j = 4 → D range high oil temperature shift map {FIG. 3 (B)} j = 3 → D3 range high oil temperature shift map {FIG. 4 (B)} j = 2 → D2 range high oil temperature The shift map {FIG. 5 (B)} j = 1 → D1 range high oil temperature shift map {FIG. 6 (B)}.

Here, the shift map in the automatic shift mode is as follows.
A shift map for normal oil temperature shown in FIGS. 3 to 6A,
The shift map for high oil temperature shown in FIGS. 3 to 6B is set, and the shift map for high oil temperature is downshifted so that the downshift is performed earlier than that for normal oil temperature. A line (broken line in the figure) is set so that the slip ratio of the torque converter 12 (the ratio of the engine speed Ne to the input shaft speed of the automatic transmission 10) is reduced by an early downshift. Further, an upshift line (solid line in the figure) is set so that the timing of the upshift is delayed, and the setting is such that the increase in the slip ratio of the torque converter 12 due to the delay of the upshift is suppressed. However, the downshift lines in the D2 and D1 ranges shown in FIGS. 5 and 6 are the same.

Next, at step S13, the current vehicle speed VSP
After reading the throttle opening TVO and the throttle opening TVO, step S1
In step S4, a new shift stage k 'is calculated from the vehicle speed VSP and the throttle opening TVO based on the shift map for high oil temperature in the automatic shift mode selected in step S12. A shift command is issued to the automatic transmission 10 according to k ′.

Since this shift command is set so that the shift map for high oil temperature is an early downshift or a late upshift, the oil temperature Te is determined in step S2.
An instruction is issued to prevent downshifting or maintain the current gear k, while preventing the gear from being shifted to the Hi side from gear k when mp exceeds the predetermined value Temphi.

Then, in step S16, the oil temperature Temp of the automatic transmission 10 read from the oil temperature sensor 8 again is
It is determined whether the oil temperature is lower than a preset oil temperature TempLo. If the oil temperature Temp is equal to or higher than a predetermined value TempLo,
While it is determined that the oil temperature is high, the process returns to step S3. On the other hand, if the oil temperature Temp is less than the predetermined value TempLo, it is determined that the high oil temperature condition has been eliminated and the process proceeds to step S17. However, the predetermined values Temphi and Temp for judging the high oil temperature state
The relationship of pLo is set to the relationship of TempLo <Temphi.

After the oil temperature Temp has fallen below the predetermined value TempLo, in step S17 the current shift mode MOD is set.
It is determined whether E is in the manual mode. If the mode is the manual mode, the process proceeds to step S18, where the shift range j in the manual mode is set to the value corresponding to the new shift speed k ′ set in step S14. After matching
The processing at high oil temperature ends.

By the processing in steps S1 to S18, the detected oil temperature Temp of the automatic transmission 10 becomes the predetermined value Temp.
If the pressure exceeds phi, the manual shift by the operation of the shift lever 3 is prohibited in steps S5 to S10, and the automatic shift mode is switched to the automatic shift mode based on the shift map for high oil temperature. If 4) is selected and the vehicle is traveling at the point A shown in FIG. 3 (B), when the high oil temperature shift map in the automatic shift mode is switched,
Automatically downshifted to the third speed (k = 3), the slip ratio of the torque converter 12 can be reduced and the decrease of the oil temperature Temp can be promoted, and the oil temperature Temp becomes a predetermined value Temp.
If the speed falls below Lo, the mode is returned to the manual mode again from the current gear stage k, and the UP switch 4 or DOW
The manual shift by the N switch 5 becomes possible, and it is possible to suppress an increase in the oil temperature in the manual mode without impairing the drivability.

Since the shift map in the automatic shift mode is used even in the manual mode at the time of high oil temperature, there is no need to create the shift map for the high oil temperature in the manual mode. Therefore, it is possible to prevent an increase in manufacturing cost due to the increase in the number of shift maps and the setting of a number of shift maps.

In this manner, the shift down is automatically performed while the manual mode is being selected to promote a decrease in the oil temperature Temp, and in the Hi gear, the accelerator is released with the lock-up clutch 12a released. When a high load is applied to the automatic transmission 10 due to operation or acceleration and deceleration and the oil temperature becomes high, manual shifting is prohibited and a downshift is quickly performed, so that an excessive increase in the oil temperature Temp can be prevented.
The drivability can be ensured while ensuring the durability of the automatic transmission 10, and at the same time, an increase in manufacturing cost can be suppressed.

When the oil temperature becomes high, manual shifting is prohibited, so that the driver does not shift in response to the operation of the shift lever 3, so that the high oil temperature of the automatic transmission 10 is not changed. The state can be easily recognized, and no special warning means needs to be provided.

FIGS. 7 and 8 show a second embodiment, in which the high oil temperature control of the lock-up clutch 12a is added to the high oil temperature shift map switching control of the first embodiment, and a manual operation is performed. In the mode, only the downshift is permitted, and the other configuration is the same as that of the first embodiment.

As described above, in step S2, the oil temperature Tem
If p exceeds the predetermined value Temphi and it is determined in step S4 that the mode is the manual mode, the processing from step S5 in FIG. 8 is performed.

In step S5, it is determined whether or not the shift lever 3 has been operated to the "-" side. If the DOWN switch 5 has been operated to the "-" side and the DOWN switch 5 has been turned on, the process proceeds to step S5.
6. To shift down one stage, set the variable i to k
After substituting −1, the process proceeds to step S12. Otherwise, the process proceeds to step S7.

In step S7, it is determined whether or not the shift lever 3 has been operated to the "+" side. Even if the shift lever 3 has been operated to the "+" side and the UP switch 4 is ON, the shift is prohibited in step S8. To maintain the current gear k
Is done. "+" Which is NO in steps S5 and S7
In the state where neither of the gears and "-" is operated, that is, when the current gear k is maintained, step S9 is performed.
Then, the current gear k is substituted for the variable i.

Next, in step S10, the shift range corresponding to the current shift stage k (= i) is substituted for the variable j in the same manner as described above.

In step S20, the conditions for engaging (locking up) and releasing (unlocking up) the lock-up clutch 12a are set based on the shift range j set from the shift speed k in the manual mode in step S10. Among the L / U lines, the L / U line for high oil temperature shown in FIG. 9B is selected. That is, j = 4 → 4 L / U ON and OFF j = 3 → 3 L / U ON and OFF j = 2 → 2 L / U ON and OFF

Here, the L / U line is set in advance in accordance with the vehicle speed VSP and the throttle opening TVO (or the accelerator operation amount). The L / U line for normal oil temperature shown in FIG.
The U line and the L / U line for high oil temperature shown in FIG. 9 (B) are set in advance, and the shift map of the L / U line for high oil temperature is lower than that for normal oil temperature. An ON line (solid line in the figure) is set so that the lock-up clutch 12 is engaged early (L / U = ON), and slippage of the torque converter 12 is eliminated by early lock-up to promote cooling of the hydraulic oil. Oil temperature Te
The setting is such as to reduce mp.

That is, in FIG.
As shown by the solid line, the ON line at high oil temperature when = 4 is set substantially linearly at a predetermined vehicle speed VSP regardless of the throttle opening TVO. On the other hand, ON for normal oil temperature
The line {dotted-dotted line in FIG. 9B} indicates a region B indicated by oblique lines
Is set to avoid. Since the throttle opening TVO is large, the region B is a region in which an engagement shock occurs when lock-up is performed. Therefore, at the time of normal oil temperature, the region B is avoided to realize smooth lock-up. .

However, when the oil temperature is high, the torque converter 12 is prevented from slipping as soon as possible to promote the reduction of the oil temperature Temp.
Even if the SP is in the low region B, the lock-up is performed regardless of the engagement shock at the time of lock-up. In the present embodiment, the ON line for the high oil temperature is set substantially linearly at a predetermined vehicle speed, and the lock-up region is enlarged. However, an arbitrary curve may be used.

On the other hand, the release (L / U = OFF) of the lock-up clutch 12a is set by an OFF line (dashed line in the drawing), and the same clutch is used for both high oil temperature and normal oil temperature.

Next, at step S21, the current vehicle speed VSP
After reading the throttle opening TVO and the
In step 2, based on the high oil temperature lock-up line selected in step S20, the current lock-up clutch 12a
It is determined whether or not lock-up is possible. If lock-up is possible, the process proceeds to step S23 to instruct the lock-up clutch 12a to be engaged.

On the other hand, if the lock-up clutch 12a cannot be engaged, the process proceeds to step S24 to forcibly downshift.

That is, 1 is subtracted from each of the variable i indicating the shift stage k, the variable i indicating the shift range, and the variable Lj indicating the L / U line, and the L / U line corresponding to the shift stage i after the downshift is obtained. Select Lj again.

In step S25, it is determined whether or not lockup is possible under the conditions after the forced downshift. If lockup is possible, the process proceeds to step S26 to instruct the automatic transmission 10 to perform lockup. If lock-up is not possible, a command is issued to unlock the lock-up clutch 12a.

After setting the gear position i in the manual mode and controlling the lock-up clutch 12a in this manner, the routine proceeds to step S12 and subsequent steps in FIG. The shift is performed based on the map of the automatic shift mode, and the above processing is repeatedly executed until the oil temperature Temp becomes lower than the predetermined value TempLo.

Therefore, when the oil temperature becomes high in the manual mode, only the upshift of the operation of the shift lever 3 is prohibited, and the L / U line for the high oil temperature is selected to lock up. Control is started, and if lock-up is not possible, forcibly downshifting is performed to perform lock-up control. Therefore, when lock-up is possible, oil temperature rise due to slippage of torque converter 12 is reliably suppressed. It becomes possible to increase the oil temperature Tem
p is quickly cooled to a value less than the predetermined value TempLo to improve the durability of the automatic transmission 10 and to reduce L for high oil temperature.
Since only the / U line is set, it is possible to prevent a significant increase in manufacturing cost. The lock-up control using the high oil temperature L / U line is terminated when the oil temperature Temp becomes lower than a predetermined value TempLo. As a result, it is possible to return to the normal manual mode, so that the driving performance is not impaired.

As in the first embodiment, even in the manual mode, the mode is switched to the automatic shift mode based on the shift map for high oil temperature, so that the downshift is automatically performed according to the shift map. Therefore, even when lock-up is not possible, the slip rate of the torque converter 12 can be reduced to promote a decrease in the oil temperature Temp, and if the oil temperature Temp falls below the predetermined value TempLo, the current temperature can be reduced. After returning to manual mode from gear k,
The manual shift by the UP switch 4 or the DOWN switch 5 becomes possible, and an increase in the oil temperature in the manual mode can be suppressed without impairing the drivability.

In the above-described embodiment, an example in which the UP switch 4 and the DOWN switch 5 in the manual mode are operated in accordance with the displacement of the shift lever 3 has been described. , Or on an instrument panel.

In the above embodiment, the case where the automatic transmission 1 is constituted by the stepped automatic transmission 10 has been described. However, the same applies to the case where the automatic transmission 1 is constituted by the V-belt type or toroidal type automatic transmission. Functions and effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of an automatic transmission according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an example of control performed by a shift control controller.

FIGS. 3A and 3B show a shift map of a D range in a normal pattern according to a vehicle speed and a throttle opening, wherein FIG. 3A is for normal oil temperature and FIG. 3B is for high oil temperature.

FIGS. 4A and 4B show a shift map in a D3 range of a snow pattern according to a vehicle speed and a throttle opening, wherein FIG. 4A is for normal oil temperature and FIG. 4B is for high oil temperature.

FIGS. 5A and 5B show a shift map of a D2 range of a snow pattern according to a vehicle speed and a throttle opening, wherein FIG. 5A is for normal oil temperature and FIG. 5B is for high oil temperature.

FIGS. 6A and 6B show a shift map in a D1 range of a snow pattern according to a vehicle speed and a throttle opening, wherein FIG. 6A is for normal oil temperature and FIG. 6B is for high oil temperature.

FIG. 7 is a first half of a flowchart illustrating an example of control performed by a shift control controller according to the second embodiment.

FIG. 8 is a second half of the flowchart.

9A and 9B show lock-up lines according to vehicle speed and throttle opening, wherein FIG. 9A is for normal oil temperature and FIG. 9B is for high oil temperature.

FIG. 10 is a claim correspondence diagram corresponding to any one of the first to fifth inventions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shift control controller 2 Selector switch 3 Shift lever 4 UP switch 5 DOWN switch 6 Throttle opening sensor 7 Vehicle speed sensor 8 Oil temperature sensor 10 Automatic transmission 12 Torque converter 12a Lock-up clutch 50 Shift mode switching means 51 Speed setting means 52 Oil temperature detecting means 53 Shift pattern setting means 54 Shift pattern switching means 55 Manual shift inhibiting means 56 Oil temperature rise suppression means 57 Lockup pattern setting means 58 Lockup pattern switching means 59 Downshift means

Claims (5)

[Claims] An automatic transmission connected to an engine via a torque converter; a shift mode switching means for selectively switching between an automatic shift mode and a manual mode of the automatic transmission; When is selected, a gear position setting means for setting a gear position in accordance with a driver's operation, an oil temperature detecting means for detecting an oil temperature of the automatic transmission, and a normal oil A shift pattern setting unit configured by a plurality of shift patterns of a temperature shift pattern and a high oil temperature shift pattern; and when the oil temperature exceeds a predetermined value when the shift mode switching unit selects an automatic shift mode. A shift control device for an automatic transmission, comprising: a shift pattern switching unit that selects the high oil temperature shift pattern. When the full mode is selected, while the oil temperature exceeds a predetermined value, at least a manual shift prohibiting unit that prohibits an upshift by the shift speed setting unit, and the manual shift prohibiting unit prohibits the manual shift. A shift control device for an automatic transmission, wherein the shift control unit switches to a high oil temperature shift pattern in the automatic shift mode during the idle period. 2. The automatic shifting device according to claim 1, wherein the manual shift inhibiting unit inhibits both the upshift and the downshift by the speed setting unit while the oil temperature exceeds a predetermined value. Transmission control device for transmission. 3. The torque converter includes a lock-up clutch, and the oil temperature rise suppressing means includes a lock-up pattern setting means including a plurality of patterns of a normal oil temperature lock-up pattern and a high oil temperature lock-up pattern. A lock-up pattern switching unit that selects the high oil temperature lock-up pattern during the period in which the manual gear shift prohibition unit prohibits the manual gear shift, and selects the normal oil temperature lock-up pattern in other cases. The shift control device for an automatic transmission according to claim 1, further comprising: 4. The lock-up pattern for high oil temperature,
The load is larger than the normal oil temperature lockup pattern,
4. The shift control device for an automatic transmission according to claim 3, wherein the lock-up clutch is set to be engaged in a region where the vehicle speed is low. 5. The oil temperature rise suppression means forcibly downshifts when the lock-up clutch is not engaged after the high oil temperature lock-up pattern is selected by the lock-up pattern switching means. The shift control device for an automatic transmission according to claim 3, further comprising downshift means.