JPH08159267A - Transmission control device for automatic transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a shift control device for an automatic transmission that performs shift control without discomfort by considering a parameter that a driver expects to shift. [Configuration] Shift pattern selection device 16, deceleration intention detection /
It has a vehicle speed storage device 17. The outputs of the accelerator opening sensor 21 and the vehicle speed sensor 22 are input to the device 17. Device 17
Has means for calculating an average vehicle speed, for example, and means for detecting the driver's deceleration intention from information obtained by the brake operation sensor 25, the shift lever movement detection sensor 26, and the accelerator opening sensor 21. The average vehicle speed at the time of detecting the deceleration intention is stored for each selected gear ratio,
Further, it has means for calculating a new vehicle speed to be stored from the vehicle speed stored in the past and the current vehicle speed value. The timing for switching the shift pattern is determined by the device 17, and when it is detected that the vehicle is traveling at the stored vehicle speed in the selected gear ratio, the shift pattern is switched.

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 shift control involving a change control of a plurality of shift patterns. The present invention relates to a gear shift control device that is applied to a case where a control for downshifting is performed to enable suitable gear shift control.

[0002]

2. Description of the Related Art An automatic transmission selects a corresponding gear stage by selectively engaging various friction elements (clutch, brake, etc.), and shifts to another gear stage (gear position) by switching engagement / disengagement of friction elements. (Upshift gearshift, downshift gearshift). When performing shift control, it is common that the shift control device determines the optimum shift speed for the operating state at that time based on the vehicle speed, accelerator opening, etc., and performs shift control so that the optimum shift speed is selected. Is.

Further, a shift control method for an automatic transmission, which is capable of changing and using a plurality of shift patterns, is disclosed in Japanese Patent Laid-Open Publication No.
It is known from Japanese Patent Publication No. 9-50261 (reference 1). In this one, the road running resistance is predicted from the relationship between the change in accelerator opening and the change in vehicle speed, and based on this,
The shift pattern is changed.

[0004]

However, such a conventional shift control method for an automatic transmission has a structure in which the shift pattern is determined only by information relating only to physical conditions such as running resistance. Therefore, the driver's expectations may not be met in some cases, such as the driving situation and driving environment. For example, let us consider a scene of downshift control for automatically generating engine braking action on a downhill. In this case, if the driver immediately detects that the road is downhill from running resistance or the like, if the driver immediately downshifts, the driver may feel that the downshift is too early, and the driver feels uncomfortable.

According to the present invention, a plurality of shift patterns for shift control of an automatic transmission are provided and can be changed. When the shift control is performed by applying the changed pattern, the driver expects a shift. It is intended to provide a gear shift control device for an automatic transmission that can switch the gear shift pattern in consideration of the parameter, and reduce the discomfort described above.

[0006]

According to the present invention, the following shift control device for an automatic transmission is provided. That is, an automatic transmission that has a plurality of shift patterns and also has shift pattern selection means, selects the shift pattern to be applied by the selection means, and shifts the shift speed using the selected shift pattern. In the shift control device, a vehicle speed detecting means for detecting a vehicle speed, a deceleration intention detecting means for detecting a driver's deceleration intention, a gear ratio detecting means for detecting a selected gear ratio, the vehicle speed detecting means and the deceleration intention detecting means. When the deceleration intention is detected based on the output of the means and the gear ratio detecting means, the vehicle speed value obtained based on the detection output of the vehicle speed detecting means is associated with the gear ratio selected at that time Vehicle speed information storage means having a function of executing learning by updating the stored data, and a shift pattern by selecting the shift pattern. When changing the engine speed, the vehicle is traveling at a vehicle speed corresponding to the vehicle speed value stored corresponding to the gear ratio detected by the gear ratio detecting means, based on the data stored by the vehicle speed information storage means. Shift detection means for switching to the shift pattern selected by the shift pattern selecting means in response to the detection result, the shift control of the automatic transmission. It is a device.

Further, in the above, the vehicle further includes means for detecting an obstacle in front of the vehicle, and when the obstacle is detected by the means, the vehicle speed value is not stored in the vehicle speed information storage means. A shift control device for an automatic transmission, characterized in that when the vehicle speed detected by the vehicle speed detection means is a low vehicle speed equal to or lower than a predetermined value, the vehicle speed information storage means does not store the vehicle speed value. A shift control device for an automatic transmission characterized by the above. Also,
The shift pattern selection means, the vehicle speed detection means and the detected vehicle speed of the accelerator opening detection means for detecting the accelerator opening operated by the driver and the detected accelerator opening as parameters for shift pattern change control, depending on the detection information, Is a means for determining a shift pattern to be selected from among a plurality of shift patterns for shift-up and shift-down shift control, wherein the deceleration intention detecting means is a detecting means for detecting that the driver has operated a brake, Detection means for detecting that the driver has operated the speed change lever,
The vehicle speed information storage means is a means for detecting the driver's deceleration intention from any one or a combination of two or more of the detection information obtained by the accelerator opening detection means, and the vehicle speed information storage means stores the average using the detection information of the vehicle speed detection means. The vehicle speed is obtained, and the average vehicle speed is set as the currently stored vehicle speed value for each gear ratio.At the time of updating, a new memorized value is calculated from the previously stored average vehicle speed and the detected vehicle speed value detected by the vehicle speed detection means at that time. A shift control device for an automatic transmission, characterized in that it includes means for setting.

[0008]

In the present invention, in addition to having a plurality of shift patterns, the shift pattern selecting means is provided, the shift pattern to be applied is selected by the selecting means, and the shift stage is shifted by using the selected shift pattern. In a shift control device for an automatic transmission, each of which has a vehicle speed detection means, a deceleration intention detection means, a gear ratio detection means, a vehicle speed information storage means, and a shift pattern switching means, the vehicle speed information storage means Based on the outputs of the vehicle speed detection means for detecting the speed reduction intention, the deceleration intention detection means for detecting the driver's deceleration intention, and the gear ratio detection means for detecting the selected gear ratio, the vehicle speed detection means is detected when the deceleration intention is detected. The vehicle speed value obtained based on the detection output of is stored as data in association with the currently selected gear ratio, and the stored data is updated. On the other hand, the gear change pattern switching means, when changing the gear change pattern by selecting the gear change pattern, determines the gear ratio detected by the gear ratio detection means based on the data stored by the vehicle speed information storage means. When it is detected that the vehicle is traveling at a vehicle speed corresponding to the correspondingly stored vehicle speed value,
In accordance with the detection result, switching to the shift pattern selected by the shift pattern selecting means is executed.
Therefore, the shift control of the automatic transmission can be appropriately performed even when the shift pattern change control is performed by considering the parameter that the driver expects to shift, not only the running resistance. The shift pattern is switched by detecting that the vehicle is traveling at the vehicle speed stored in the past learning at the selected gear ratio, and the timing for switching the shift pattern is appropriately determined based on the vehicle speed data. This makes it possible to minimize discomfort to the driver due to shifting of the shift pattern, especially when performing control for downshifting so that engine braking automatically works on a downhill. It is suitable.

Further, if a means for detecting an obstacle in front of the vehicle is further provided, and if the obstacle is detected, the vehicle speed information storage means is not allowed to store the vehicle speed value, the above-mentioned matters are similarly taken. In addition to making it possible to realize it, in this case, it is possible to use the stored data in the state where there is no disturbance in the past as the vehicle speed data, and to change the shift pattern time to the vehicle speed data in the case where there is no disturbance in the past. It is possible to further reduce the discomfort to the driver due to the shift pattern switching. Further, when the vehicle speed detected by the vehicle speed detecting means is a low vehicle speed equal to or lower than a predetermined value, if the vehicle speed information is not stored in the vehicle speed information storage means, it is possible to similarly realize the above, Also in this case, the data stored in the past without disturbance can be used. Driving at a low vehicle speed, or
It is unavoidable that there are many obstacles ahead, for example, and it is likely that the brakes will be depressed due to these specific disturbances. Learning is something that is banned,
Therefore, even by such a method, it is possible to determine the timing for switching the shift pattern based on the vehicle speed data when there is no disturbance in the past, thereby further reducing the discomfort to the driver due to the shift pattern switching. This is possible, and in this case, this can be easily realized by using the vehicle speed detecting means.

Further, as the shift pattern selecting means, the deceleration intention detecting means, and the vehicle speed information storing means, the shift pattern selecting means detects the vehicle speed by the vehicle speed detecting means and the accelerator opening detecting means for detecting the accelerator opening operated by the driver. And a detected accelerator opening degree as a parameter for shift pattern change control, which is a means for determining a shift pattern to be selected from among a plurality of shift patterns for shift control of shift up and shift down according to the detection information, Any one of the detection means for detecting that the deceleration intention detecting means detects that the driver has actuated the brake, the detection means for detecting that the driver has actuated the shift lever, and the detection information obtained from the accelerator opening detection means, or A means for detecting the driver's deceleration intention from a combination of two or more, and the vehicle speed information storage means, The average vehicle speed to be stored is obtained using the detection information of the speed detecting means, and this average vehicle speed is set as the currently stored vehicle speed value for each gear ratio, and at the time of updating, the average vehicle speed stored in the past and the vehicle speed detecting means detected at that time are detected. The present invention can be implemented as a configuration including means for setting a new memorized value from the detected vehicle speed value, and it is possible to realize the above in the same manner. It is suitable to be applied when performing control for downshifting so as to operate.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a shift control device for an automatic transmission according to an embodiment of the present invention, in which 1 is an engine of a vehicle and 2 is an automatic transmission having a stepped shift, for example. It is assumed that the automatic transmission 2 receives the power of the engine 1 via the torque converter 3, shifts the input rotation at a gear ratio according to the selected shift speed, and transmits it to the output shaft 4. Here, the automatic transmission 2 uses the O of the shift solenoids 6 and 7 in the control valve 5.
The selected gear is determined by the combination of N and OFF,
Similarly, the torque converter 3 is assumed to be in a converter state where input / output elements are not directly connected or a lockup state where input / output elements are directly connected by duty control of the lockup solenoid 8 in the control valve 5.

ON / OFF of shift solenoids 6 and 7,
Also, an automatic transmission controller (A / T controller) 10 is provided for controlling the drive duty D of the lockup solenoid 8, and this controller 10 has an accelerator opening degree for detecting the throttle opening degree (accelerator opening degree) of the engine 1. A signal from the sensor 21, for example, a signal from a vehicle speed sensor 22 that detects the vehicle speed from the rotation speed of the transmission output shaft 4,
A signal or the like from the optimum shift pattern selection device 16 is input.

The A / T controller 10 supplies an input detection circuit, an arithmetic processing circuit, a memory circuit storing an arithmetic program for gear shift control executed by the arithmetic processing circuit, and a drive signal to each solenoid. It is composed of an output circuit for sending out. The storage circuit can also store various shift pattern characteristics (shift point characteristic data) determined by the accelerator opening and vehicle speed applied in the upshift and downshift of the shift control. Here, the characteristics of a plurality of shift patterns including the shift pattern for downhill are set (see FIG. 3). The characteristic data of such a shift pattern is stored as map data in the memory of the memory circuit in the controller.

Accelerator opening sensor 21 and vehicle speed sensor 22
Is also input to the optimum shift pattern selection device 16. The selection device 16 constitutes means for selecting a shift pattern on the basis of the vehicle speed and the accelerator opening according to the accelerator operation by the driver. A / T controller 10
As described above, a plurality of shift maps are set inside the, and a signal from the optimum shift pattern selecting device 16 determines which shift map is used for shifting. When the applied shift map is switched, the automatic transmission 2 selects the shift gear by operating the control valve 5 according to the shift command from the controller 10 determined according to the shift control program based on the selected shift map.

In addition to the basic system as described above, the following configuration is further provided here. The outline is as follows. In the present embodiment, in addition to the sensors 21 and 22, a brake operation sensor 25 that detects that the driver has actuated the brake and a shift lever movement detection sensor 26 that detects that the driver has actuated the shift lever. In addition to the above, the deceleration intention detection / vehicle speed storage device 17 is provided.

The deceleration intention detection / vehicle speed storage device 17 constitutes means for detecting the driver's deceleration intention.
The sensor signals of the accelerator opening sensor 21, the brake operation sensor 25, and the shift lever movement detection sensor 26 are used as input information for the detection / judgment, and the respective signals are input to the deceleration intention detection / vehicle speed storage device 17. Further, the gear position signal currently selected by the controller 10 in accordance with the shift control program is the deceleration intention detection / vehicle speed storage device 1.
7 (the A / T controller 10 constitutes means for detecting the gear ratio information which is currently selected and giving it to the device 17). Further, the signal from the vehicle speed sensor 22 is also input to the vehicle speed storage device 17. The deceleration intention detection / vehicle speed storage device 17 is also a means for sequentially storing the vehicle speed information at the time when the driver's deceleration intention is detected for each selected gear ratio at that time. The device 17 is configured to include a memory circuit for this purpose.
In principle, the stored vehicle speed information is updated (learning) each time the driver's intention to decelerate is detected, and the vehicle speed information thus obtained is applied to the comparison judgment with the actual vehicle speed when changing the shift pattern. It will be one. And
The output of the device 17 for deceleration intention detection / vehicle speed storage is A
It is input to the / T controller 10 and is used to determine when to switch the shift pattern.

In this embodiment, the shift control system thus includes the deceleration intention detection / vehicle speed storage device 17 in addition to the A / T controller 10 and the optimum shift pattern selection device 16. The shift control is basically performed by using the shift pattern currently selected from the plurality of shift patterns for shift up and shift down control stored in advance in the controller 10 while traveling in the D range. The control is performed according to a shift schedule based on the corresponding characteristics so that the optimum shift speed is obtained by a lookup method using the accelerator opening input to the A / T controller 10 and vehicle speed information as parameters, and the shift is performed to each shift speed. This is executed, and based on the accelerator opening degree and vehicle speed information, the optimum shift pattern selected as the shift pattern to be applied is instructed from the shift pattern selection device 16 when applicable.

That is, in the above structure, the signals from the accelerator opening sensor 21 and the vehicle speed sensor 22 are input to the controller 10 and, at the same time, to the optimum shift pattern selecting device 16. In the optimum pattern selection device 16, for example,
It is assumed that the setting of the shift pattern is determined by the determination logic of FIG. Here, in the flowchart illustrated in FIG. 2, the control logic includes, for example, a determination step 101 regarding whether or not the accelerator opening is fully closed,
It comprises a determination step 102 as to whether or not the acceleration increases with time, and a step 102 for instructing a change to a downshift (downhill) shift pattern when these conditions are both satisfied. The content of such logic is also an example of means for determining whether the vehicle is traveling on a downhill (note that the content of the selection process itself is improved by the control described later, and includes a shift pattern including learning control). It is not the aim of switching control, so other methods may be used).

An example of the shift pattern that can be switched is as shown in FIG. 3, and in the case of downshift control during downhill traveling, the shift pattern from the upper shift pattern to the lower shift pattern (this shift pattern in this figure) The lower shift map characteristic has a shift line (3-2
The engine braking is realized by the automatic switching to (the shift line is set to the high vehicle speed side). As the actual shift control, the shift pattern to be selected in this way is used in place of the shift pattern before the selection, whereby the A / T controller 10 performs control so as to shift to the shift stage. Will be seen.

However, according to the present invention, in the shift control accompanied by such shift pattern change control, when switching the shift pattern, for example, switching to downshift control during downhill traveling as shown in FIG. , It also reflects the information about what the vehicle speed is like without depending only on the downhill detection, and also the learning control so that the downshift is executed at an appropriate speed according to the driver's intention. As an introduction, the deceleration intention detection / vehicle speed storage device 17 as described above is provided.

In the present system, this is roughly divided into the following two functions. First, one is a function of storing a speed, and the other is a function of switching a shift pattern according to the stored value. Here, preferably, the average vehicle speed is used as the vehicle speed information. Preferably, as described above, when the average vehicle speed at the time of deceleration intention detection is stored / updated for each selected gear ratio, the deceleration intention detection / vehicle speed storage device 17 determines that the vehicle speed is low. In the case of, it is preferable that the learning control is prohibited and the control mode switching control is also performed.

Each function will be further described below with reference to FIGS. 4 to 6 including the above-mentioned preferred examples.
Here, FIG. 4 is a flowchart of an example of the logic for storing the vehicle speed, and FIGS. 5 and 6 are flowcharts of an example of the shift pattern switching.

[Function for storing speed] Regarding this,
It looks like this: A signal from the vehicle speed sensor 22 is input to the deceleration intention detection / vehicle speed storage device 17, and the vehicle speed is constantly monitored. Here, the device 17 executes the process shown in FIG. 4 based on the vehicle speed input information.
This corresponds to the content of step 305 in the flowchart of FIG. Based on a signal from the accelerator opening sensor 21, it is detected that the accelerator is fully closed (step 301 in FIG. 5), and basically, a signal from the brake operation sensor 25 detects that the brake is operated. If the operation of the shift lever is detected by the signal from the shift lever movement detection sensor 6 (step 302) (that is, the driver steps on the brake to stop or decelerate). When the driver moves the gearshift lever from the D range to the second speed or the like to express the intention or to change the gear set by the automatic transmission 2 (in this case, the overdrive (O. D) Release is equivalent to moving the shift lever), and the vehicle speed storing process of FIG. 5 is selected.

In step 201 of FIG. 4, the vehicle speed at that time is sampled, and the vehicle speed to be stored is calculated by the vehicle speed sampling algorithm shown in the same figure based on the value, and as shown below, the A / T controller 10 is operated. The data is stored in the storage area (table) corresponding to the gear position input from.

[0025]

[Table 1]

Specifically, when the current vehicle speed v is fetched (step 201), the vehicle speed here is a predetermined value, for example, 2
If it is determined that the value is 0 km / h or more (step 202) and the value is equal to or more than a predetermined value, the next moving average expression is calculated from the current measured v value (sensor value) and the last (stored) value V (table value). ,

## EQU1 ## Based on V = ((7 × V) + v) / 8) 1 the current value V is calculated (step 203), and the calculated value V is used as the stored average vehicle speed (step 20).
4). In this way, a new vehicle speed to be stored is calculated from the vehicle speed values stored in the past and the current vehicle speed. Then, the information thus obtained is stored in the corresponding storage area in order to rewrite it (update the table) according to the gear position at that time (step 205).

An example of the stored contents of the vehicle speed information obtained by storing the average vehicle speed for each gear at the timing when it is detected that the driver expresses the intention of deceleration is described above. Are the contents of Table 1 above, and in this example, the latest data values 21 (km / h) and 34 (km / km) are used as downshift points, respectively.
It means that the values h) and 54 (km / h) are stored in the table. Then, in this control, the data thus stored is read from the table and referred to in the shift pattern change control, and it is determined whether the corresponding stored value allows the shift pattern switching. At this time, it becomes a comparison determination value with the actual vehicle speed at that time (step 308 in FIG. 6).

Further, in the present embodiment, in the vehicle speed storing process, as shown in the flow chart of FIG. 4, when the vehicle speed is less than a predetermined value (20 km / h in the illustrated example),
Do not remember (non-learning). The reason why the data is not rewritten in this case is as follows. That is, there are many obstacles ahead, for example, when the vehicle is traveling at low vehicle speed (which is unavoidable), and there is a high possibility that the brake will be applied due to these specific disturbances. Therefore,
In that case, learning prohibits this. Also,
In this case, the above can be realized by utilizing the information from the vehicle speed sensor 22.

If the vehicle speed is stored by operating the brake as the rewriting timing (step 303 in FIG. 5), the accelerator is fully closed for a predetermined time (for example, about 10 seconds) before the braking operation. It is preferable to limit it to the case (step 304 in the figure). This is to exclude the case where the brakes are applied due to a specific disturbance such as an obstacle during acceleration from the target, and also to take care not to remember the specific situation.

By the processing procedure described above, the downshift point is learned toward the low speed side. In addition, in order to downshift at the optimum speed, a processing procedure for changing the speed to the high speed side is also necessary. Regarding this, by introducing the following processing procedure, the learning direction is bidirectional. And it is possible to converge to a more optimal value. In the present embodiment, as shown in FIG. 6, when downshifting is performed by this control (step 308), the movement of the accelerator opening is observed for a predetermined time (for example, about 1 second or 2 seconds) (step 308). 310), observing whether the accelerator is stepped on at a predetermined opening or more (for example, 2 to 3 degrees). Then, at this time, when the accelerator is stepped on, it is determined that the downshift by the previous control is too early for the driver, and at this time, with respect to the speed stored in the table of Table 1 above, The data may be rewritten (updated) so that a value obtained by increasing the speed by Δ (Δ> 0) is stored as the average speed (step 311). Thus, as shown in Table 1, the vehicle speed and the gear ratio can be associated with each other.

[Function of Switching Shift Pattern According to Stored Value] Regarding this, as partially touched above, the shift pattern can be changed as follows.
Now, let us consider a process of shifting to a shift map in which the vehicle is approaching a downhill while the vehicle is traveling in the D range and engine braking is effectively applied as shown in FIG.

If the conventional system is used because the vehicle entered a downhill, the downshift is detected, and the gear shift pattern shown in the lower portion of FIG. 3 is selected. However, when the driver wants the engine brake, information related to the downhill and how fast the vehicle is now influences the driver's intention to obtain the engine brake. Therefore, with emphasis on this point, in the present embodiment, under the control of the device 17, the previously stored speed, that is, the driver himself decelerates in the past or accelerates for correction. Whether the current vehicle speed has reached the vehicle speed at that time is determined, and the shift pattern is changed accordingly.
The control flow at this time is shown in FIGS.

Steps 301 to 30 shown in FIG.
Process 4 is as described above, and is a process of determining whether or not the accelerator is fully closed (step 301), and a process of determining whether or not the shift lever is moved (step 30).
2) The process of determining whether the brake is depressed (step 303) and the process of determining whether the accelerator is fully closed for a predetermined time or more (step 302). If the accelerator is not fully closed, these steps 301 to 304 and step 305 (processing according to the flow of FIG. 4) are skipped, and the process directly proceeds to step 306 and subsequent steps.

When the accelerator is fully closed and the shift lever is moved, step 305 is selected. Even if the shift lever has not been moved, the brake is pressed according to the determination in step 303, and step 303
If the condition that the accelerator is fully closed is equal to or longer than the predetermined time, the step 305 is selected. As described above, the vehicle speed storage process is performed in step 305. In either case, the process proceeds to step 305 via step 305. For the above, step 30
If the conditions of 3, 304 are not satisfied, the process directly proceeds to step 306 and subsequent steps. When applicable, the device 17 performs deceleration intention detection and vehicle speed storage in this way.

In step 306, it is determined whether or not the vehicle is traveling downhill. If the vehicle is not traveling downhill, the processing from step 307 onward is skipped, and this routine is terminated. Here, the content of step 306 may be based on the flow of FIG. When it is determined that the vehicle is downhill, basically, the processing is selected in the direction of the shift down control by switching the shift pattern to apply the engine brake. First, therefore, the current gear ratio is read in step 307. Then, the determination in step 308 is performed. In this step, based on the read gear ratio, as shown in Table 1, for each gear ratio, the latest corresponding storage vehicle speed stored at that time (average vehicle speed table data according to the selected gear ratio) Is read and read to determine whether the current vehicle speed value is greater than its stored value.

As a result, if the average speed is greater than the stored average speed, the shift pattern is changed (step 309). On the other hand, if the average speed is not greater than the stored average speed, the process of step 309 is performed. The process is skipped and this routine is finished as it is. As a result, in that case,
Even if the vehicle is traveling downhill, the shift pattern is not changed, and thus the downshift control is not executed. When the actual vehicle speed reaches the vehicle speed at the time when the driver performed the deceleration operation in the past, it is switched to the shift pattern change processing side.

As described above, the shift pattern is switched by detecting that the vehicle is traveling at the vehicle speed stored in the past learning at the selected gear ratio, and the shift pattern is switched. The timing can be appropriately determined based on the vehicle speed data, and therefore, the discomfort to the driver due to the shift pattern change can be minimized. Also, as the vehicle speed data applied to it,
As mentioned above, learning is prohibited under certain conditions.
Rewriting data without past disturbance (that is, data that can appropriately reflect the driver's intention)
Since it can be used, it can be configured to determine the timing for switching the shift pattern based on the vehicle speed data when there is no disturbance in the past, and this also aims to further reduce the discomfort to the driver by switching the shift pattern. You can

After executing step 309, step 310
And if applicable, the routine ends through steps 311 and 312. These are for the correction processing of the memory vehicle speed table data when the driver takes the acceleration operation as described above, and if the accelerator is not depressed within the predetermined time, the result of terminating this routine as it is, The stored vehicle speed data is maintained at that time. On the other hand, if the accelerator is depressed within the predetermined time, the stored vehicle speed data referred to when changing the above-mentioned shift pattern should be increased by the predetermined value Δ (that is, the change of the shift pattern should be made more than this time. Then, the stored value is corrected in the direction in which it becomes difficult to perform the control (in the control mode of steps 308 and 309), and the shift-up is performed, and this routine is ended. Therefore, in this case, the value obtained by the rewriting by the correction becomes the base for the next data update. In this way, if such processing is also added, learning can be executed to a more appropriate value, and it is even more effective for avoiding the driver's discomfort due to the shift pattern switching.

Next, another embodiment of the present invention will be described with reference to FIGS.
This will be described below. The present embodiment is further provided with means for detecting an obstacle in front of the vehicle, and when the obstacle is detected, the processing for storing the vehicle speed is not performed. In this embodiment, as shown in FIG. 8, in addition to the same components as those of the first embodiment shown in FIG. 1, a laser radar 27 as a device for judging the situation in front of the vehicle is added. . Here, laser radar 27
May be, for example, an image sensor, and may be 40 m from the front 100 m.
It suffices to be able to recognize whether there is an obstacle within the range of m. The laser radar 27 detects the deceleration intention of its output.
The vehicle speed storage device 17 is connected to the device 17 for input information.

The other components may be basically the same as those in FIG. 1 of the first embodiment, and the control contents have been described with reference to FIGS. Except for the difference described with reference to FIG. 9, this may basically have the same content. FIG. 9 shows a control algorithm in the case of the present embodiment, and shows a main part of an example of a flowchart for switching a shift pattern. In the figure, each determination step 401 to 404 and vehicle speed storage processing step 406 are
The processing is the same as the determination steps 301 to 304 and the vehicle speed storage processing 305, which are the corresponding portions in FIG. 5, respectively. The difference from FIG. 5 is that in the present embodiment,
As shown in FIG. 9, step 405 of judging whether or not there is an obstacle based on the detection output of the laser radar 27.
Is added between step 402 or 404 and step 406. Note that the processing after step 406 is the same as that in the case of FIG. 5 and FIG. 6 in the first embodiment, so the illustration is omitted.

According to the configuration of this embodiment, when there is no obstacle, the processing for storing the vehicle speed as shown in FIG. 4 is executed in step 405. However, when the presence of the obstacle is detected, the step 405 is not executed. Therefore, if the laser radar 27 has an obstacle within a predetermined distance range, the accelerator opening is fully closed (step 401) and the brake is depressed (step 4).
03) or by operating the shift lever (step 4
02), so that the vehicle speed at that time is not stored. This is because an obstacle ahead is a disturbance to the driver, and even if memory is executed in this state, that is, learning control is performed, the shift map is appropriately switched based on the value. Therefore, in this case, step 406 itself is skipped so that the learning control is not performed.

Also according to this embodiment, the same operational effect as that of the first embodiment can be obtained, and the shift control of the automatic transmission can be realized without any discomfort by taking into consideration the parameter that the driver expects to shift. The pattern switching timing can be determined based on vehicle speed data when there is no disturbance such as past obstacle non-detection state, and by doing so, discomfort to the driver due to shift pattern switching can be minimized. You can

The present invention can be applied to both a stepped transmission and a continuously variable transmission as an automatic transmission to which the present invention is applied. Therefore, it may be implemented in a continuously variable transmission.

The contents described in the above embodiments are as follows.
It can be understood as the following inventions. (1) The vehicle speed detecting means includes a means for detecting a vehicle speed, a means for detecting an accelerator opening operated by a driver, and a means for storing a plurality of shift patterns for shift control of shift up and shift down. And means for selecting a shift pattern from two means of accelerator opening detection means,
In a shift control method for an automatic transmission that shifts to each shift stage using the plurality of shift patterns, the automatic transmission has a means for calculating an average vehicle speed from an output of the vehicle speed detecting means, and a driver operates a brake. Means for detecting that the driver has actuated, means for detecting that the shift lever has been operated, and accelerator opening detection means for detecting the driver's intention to decelerate from the information obtained from the above three detecting means. And a means for detecting the selected gear ratio, the average vehicle speed at the time of detecting the deceleration intention is stored for each selected gear ratio, and the vehicle speed stored in the past and the current vehicle speed are stored. Means for calculating a new vehicle speed to be stored from the stored value of, and means for detecting that the vehicle is traveling at the stored vehicle speed at the selected gear ratio and accelerator opening detection Shift control method of an automatic transmission, characterized by comprising a means for switching the shift pattern of the transmission from the unit. (2) In the shift control method for an automatic transmission according to the above (1), there is provided means for detecting a front obstacle, and when an obstacle is detected, the control of the above (1) (memory of the vehicle speed is stored. A method for controlling a shift of an automatic transmission, characterized in that (3) In the shift control method of the automatic transmission according to (1), the learning control of (1) is prohibited when the vehicle speed is a low vehicle speed equal to or lower than a predetermined value. .

[0045]

According to the present invention, the shift control of the automatic transmission can be appropriately performed even when the change control of the shift pattern is involved by considering the parameter that the driver expects to shift, and at the selected gear ratio. By detecting that the vehicle is traveling at the vehicle speed stored in the past learning, the shift pattern can be switched, and the timing for switching the shift pattern can be appropriately determined based on the vehicle speed data. It is possible to minimize discomfort to the driver and reduce discomfort.

Further, if a means for detecting an obstacle in front of the vehicle is further provided and the vehicle speed value is not stored in the vehicle speed information storage means when the obstacle is detected, the above is similarly realized. And in this case,
As the vehicle speed data, data stored in the past in the absence of disturbance can be used, and it is possible to adopt a configuration in which the timing for switching the shift pattern is determined based on the vehicle speed data in the absence of past disturbance. It is possible to reduce discomfort to the driver due to the shift pattern switching.

Further, when the vehicle speed detected by the vehicle speed detecting means is a low vehicle speed equal to or lower than a predetermined value, if the vehicle speed information storing means does not store the vehicle speed value, the above can be realized and the low speed can be achieved. If you are driving at the vehicle speed or you have to do so, there are many obstacles ahead, for example, and it is likely that you will step on the brake due to these specific disturbances. In such a case, learning can be prohibited, so that in this case as well, the data stored in the past without disturbance can be used. Therefore, also by this, it is possible to determine the time to switch the shift pattern based on the vehicle speed data when there is no disturbance in the past, and it is possible to further reduce the discomfort to the driver due to the shift pattern change.
And again, in this case, by using the vehicle speed detection means,
This can be done easily.

Further, the shift pattern selecting means uses the detected vehicle speed and the detected accelerator opening of the vehicle speed detecting means and the accelerator opening detecting means for detecting the accelerator opening operated by the driver as the shift pattern changing control parameters, and detects the information. Is a means for determining a shift pattern to be selected from among a plurality of shift patterns for shift up and shift down control, and the deceleration intention detecting means detects that the driver has actuated the brake. Detection means, detection means for detecting that the driver has operated the shift lever, detection means for detecting the driver's deceleration from one or more combinations of the detection information obtained from the accelerator opening detection means. Information storage means
The average vehicle speed to be stored is obtained by using the detection information of the vehicle speed detection means, and the average vehicle speed is set as the currently stored vehicle speed value for each gear ratio, and at the time of updating, the average vehicle speed stored in the past and the vehicle speed detection means at that time are detected. As a configuration including means for setting a new value to be stored from the detected vehicle speed value, the present invention can be implemented, and the above can be realized in the same manner.
In particular, it is suitable for application when performing control for downshifting so that engine braking automatically operates on a downhill.

[Brief description of drawings]

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

FIG. 2 is a diagram showing an example of a control flowchart for selecting a shift pattern in the same example.

FIG. 3 is a diagram showing characteristics of an example of a shift pattern to be switched.

FIG. 4 is an example of a flowchart of a logic that stores a vehicle speed.

FIG. 5 is an example of a flowchart of shift pattern switching control, which is a diagram showing a part thereof.

FIG. 6 is a diagram showing another part of the same.

FIG. 7 is a diagram showing the configuration of another embodiment of the present invention.

FIG. 8 is an example of a flowchart of shift pattern switching control, which is used in the main part of the example.

[Explanation of symbols]

 1 Engine 2 Automatic Transmission 3 Torque Converter 4 Transmission Output Shaft 5 Control Valve 6, 7 Shift Solenoid 8 Lockup Solenoid 10 Automatic Transmission Controller (A / T Controller) 16 Optimal Shift Pattern Selector 17 Deceleration Intention Detection / Vehicle Speed Memory Device 21 Accelerator opening sensor 22 Vehicle speed sensor 25 Brake operation sensor 26 Gear shift lever movement detection sensor 27 Laser radar

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F16H 59:54

Claims (4)

[Claims] 1. Having a plurality of shift patterns,
A vehicle speed for detecting a vehicle speed in a shift control device for an automatic transmission, which has a shift pattern selecting means, selects a shift pattern to be applied by the selecting means, and shifts a shift stage by using the selected shift pattern. Detection means, deceleration intention detection means for detecting the driver's deceleration intention, gear ratio detection means for detecting the selected gear ratio, output to the vehicle speed detection means, deceleration intention detection means, and gear ratio detection means Based on this, when the deceleration intention is detected, the vehicle speed value obtained based on the detection output of the vehicle speed detecting means is
A vehicle speed information storage unit having a function of executing learning by storing the data in association with the gear ratio selected at that time, and updating the stored data; At the time of changing, it is confirmed that the vehicle is traveling at a vehicle speed corresponding to the vehicle speed value stored corresponding to the gear ratio detected by the gear ratio detecting means, based on the stored data by the vehicle speed information storage means. A shift control device for an automatic transmission, comprising: a shift pattern switching unit that, when detected, shifts to a shift pattern selected by the shift pattern selection unit according to the detection result. 2. The vehicle further comprises means for detecting an obstacle in front of the vehicle, and when the obstacle is detected by the means, the vehicle speed information storage means does not store the vehicle speed value. The shift control device for an automatic transmission according to claim 1. 3. The vehicle speed value storage means does not store the vehicle speed value when the vehicle speed detected by the vehicle speed detection means is a low vehicle speed equal to or lower than a predetermined value. The shift control device for an automatic transmission according to claim 2. 4. The shift pattern selecting means uses the detected vehicle speed and the detected accelerator opening of a vehicle speed detecting means and an accelerator opening detecting means for detecting an accelerator opening operated by a driver as shift pattern changing control parameters, and detects them. According to the information, it is means for determining a shift pattern to be selected from among a plurality of shift patterns for shift-up and shift-down shift control. It is a means for detecting the driver's intention to decelerate from one or a combination of two or more of the detecting means for detecting, the detecting means for detecting that the driver has operated the shift lever, and the detection information obtained by the accelerator opening detecting means. The vehicle speed information storage means obtains an average vehicle speed stored using the detection information of the vehicle speed detection means, and the average The speed is set to the currently stored vehicle speed value for each gear ratio, and at the time of updating, a means for setting a new memorized value from the average vehicle speed stored in the past and the detected vehicle speed value detected by the vehicle speed detection means at that time is included. Claim 1, Claim 2, or Claim 3 characterized by the above.
A shift control device for the automatic transmission described.