JPH09292011A - Control device for automatic transmission - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] An automatic transmission having improved compatibility between a road condition on a planned driving road and a shift pattern when performing learning control for reflecting vehicle running state information on the shift pattern of the automatic transmission. To provide a control device. SOLUTION: In an automatic transmission control device that performs learning control for reflecting traveling state information in control information of the automatic transmission, a step 1 of detecting a condition of a road on which a vehicle is going to travel,
2 and step 4 that prohibits learning control corresponding to the current road condition when it is detected that the current road condition and the road condition ahead are different in steps 1 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission, and more particularly to a control device for an automatic transmission capable of executing control of the automatic transmission according to a road condition on which a vehicle is traveling. is there.

[0002]

2. Description of the Related Art As is well known, an automatic transmission is provided with components such as a torque converter, a lockup clutch, a planetary gear mechanism, and a friction engagement device for switching a torque transmission path of the planetary gear mechanism. Then, according to the preset control information, specifically, the shift pattern,
The above components are controlled based on the running state of the vehicle. Therefore, various shift patterns are prepared in correspondence with road conditions and driving directions, and the driver arbitrarily switches the shift patterns according to the road conditions and driving directions.

However, the road condition may change greatly or change momentarily depending on the weather when the vehicle actually travels, so that the shift pattern must be changed frequently, and the change control becomes complicated. . Further, since the driver's driving directions are various, there is no shift pattern corresponding to the driving direction, and there is a possibility that the drivability desired by the driver cannot be realized.

Therefore, in recent years, it is possible to cope with changing road conditions and various driving directions by performing learning control for updating the shift pattern based on the traveling state information detected while the vehicle is traveling. A control device for the automatic transmission has been proposed. An example of such a control device for an automatic transmission is described in Japanese Patent Application Laid-Open No. 62-278351.

The automatic transmission control device described in this publication includes a traveling state detecting means for detecting a traveling state of a vehicle, a pattern setting means for setting a plurality of shift patterns of the automatic transmission, and a shift pattern. Accordingly, a shift control means for controlling the shift of the automatic transmission based on the running state,
An operating state detecting means for detecting the operating state of the vehicle, a pattern changing means for changing the shift pattern used by the shift control means according to the operating state of the vehicle, an engine load detecting means for detecting the engine load, and an engine load detecting means. Change amount switching means for switching the change amount of the shift pattern changed by the pattern changing means based on the above.

According to this automatic transmission control device, the engine load, for example, the throttle opening, the pedaling force of the accelerator pedal, etc. are detected while the vehicle is running, and the pattern changing means determines the shift pattern based on the operating state of the vehicle. Since the learning control for switching the change amount in the case of changing based on the engine load is performed, the adaptability of the shift pattern to the road condition and the driving direction of the driver is improved.

[0007]

However, in the control device for the automatic transmission described in the above publication, the learning control of the same content is always performed while the vehicle is running, so that the running state on the road where the situation changes is changed. There is a possibility that the shift pattern updated based on this may be used for shift control of the automatic transmission when traveling on a road where the situation does not change. As a result, the shift pattern may not match the road conditions, and the running performance and drivability of the vehicle may deteriorate.

The present invention has been made in view of the above circumstances, and when performing learning control for updating the control information of the automatic transmission on the basis of the traveling state information of the vehicle, the road condition and the automatic transmission of the planned traveling road are performed. An object of the present invention is to provide a control device for an automatic transmission, which can further improve compatibility with control information of the machine.

[0009]

To achieve the above object, the present invention performs learning control for updating the control information based on the control information of the automatic transmission and the traveling state information of the vehicle. In the control device of the automatic transmission, when the road information detecting means for detecting the situation of the road on which the vehicle is going to travel and the road information detecting means detects that the current road situation and the road situation ahead are different from each other. , Learning control prohibiting means for prohibiting learning control corresponding to the current road condition is provided.

In the present invention, the control information of the automatic transmission which is the object of the learning control is the shift point at the time of upshifting or downshifting, the line pressure or accumulator back pressure at the time of switching the shift speed, or the friction engagement device. The engagement pressure, the engagement / release timing of the lockup clutch, and the like can be exemplified. Further, as the traveling state information of the vehicle, a throttle opening, a vehicle speed, a stepping speed or a stepping amount of an accelerator pedal or a brake pedal, a steering angle, etc. can be exemplified.

Therefore, according to the present invention, when performing the learning control for updating the control information of the automatic transmission based on the traveling state information of the vehicle, the current road condition and the road condition in front may be different. If detected, learning control corresponding to the current road condition is prohibited, so that the compatibility between the road condition and the control information is improved, and the running performance and drivability of the vehicle are further improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described more specifically with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a control device for an automatic transmission according to an embodiment of the present invention. In the figure, the engine 1 mounted on the vehicle is a gasoline engine, a diesel engine, or an LP.
Known internal combustion engines such as G engine, gas turbine, and jet engine are used. Intake pipe 2 of engine 1
The throttle valve 3 provided on the vehicle is connected to an accelerator pedal 4, and the throttle valve 3 is opened and closed according to the amount of depression of the accelerator pedal 4.

An automatic transmission 5 is connected to the output side of the engine 1. In this embodiment, a stepped transmission type automatic transmission 5 is adopted. The automatic transmission 5 includes well-known components (none of which are shown) such as a torque converter, a lockup clutch, a planetary gear mechanism, and a friction engagement device (brake, clutch) that switches a torque transmission path of the planetary gear mechanism. ing. Then, the engagement hydraulic pressure of the friction engagement device, the engagement / release timing of the lockup clutch, and the line pressure which is the original pressure of the friction engagement device when the gear position of the automatic transmission 5 is changed are the automatic transmission. It is controlled by a hydraulic control device 6 provided inside 5.

The hydraulic control device 6 is electrically controlled, and has a shift solenoid valve for executing a shift, a shift solenoid valve for controlling an engine braking state,
A linear solenoid valve for controlling the line pressure, a linear solenoid valve for controlling the accumulator back pressure, a linear solenoid valve for controlling the lockup clutch, and the like are provided.

On the other hand, a navigation system 7 for guiding and recognizing the traveling of a vehicle includes a player 8 in which an information recording medium such as a magnetic disk or an optical disk (not shown) is loaded.
A display 9 including a CRT or a liquid crystal display for displaying information stored in the information recording medium, that is, a road around the vehicle, a map, and the like, and a position detector 10 for detecting the current position of the vehicle. It has and.

The information recording medium stores information necessary for guiding the vehicle, such as maps, place names, roads, main buildings around the roads, and concrete conditions of the roads, that is, slopes or flat roads. Whether it is a curve or a straight road, the grade of the slope, the radius of the curve, the direction of the slope (uphill, downhill), whether it is a paved road, urban area or mountainous area, highway or ordinary road, low friction coefficient road Road information such as whether or not it is a cold region is stored.

Further, the position detecting section 10 is a self-contained navigation method for detecting a position based on a vehicle-side signal such as a geomagnetic sensor, a gyro sensor, a speed sensor for detecting a change in heading from a difference between left and right wheels, a steering wheel angle sensor, or the like. , GPS receivers that receive radio waves from artificial satellites, receivers that receive radio waves from beacons and sign posts installed on the roadside, radar receivers that use microwaves, etc. An example of radio navigation is to receive radio waves from the outside and detect the position.

The player 8, the display 9 and the position detector 1
0 is connected to an electronic control unit (ECU) 11 so that data communication is possible, and its control is performed. This electronic control unit 11
Is a central processing unit (CPU) and a storage device (RA
M, ROM) and a microcomputer mainly including an input / output interface. Then, the road condition data detected by the navigation system 7 is transferred to an electronic control unit (ECU) 12 that controls the engine 1 and the automatic transmission 5.

The electronic control unit 12 is composed of a central processing unit (CPU), a storage unit (RAM, ROM), and a microcomputer mainly including an input / output interface. Then, the electronic control unit 12
While the fuel injection amount and ignition timing of the engine 1 are controlled by the engine 1, signals such as throttle opening, engine speed, intake air amount, intake air temperature, engine water temperature are input from the engine 1 to the electronic control unit 12. To be done.

Further, the electronic control unit 12 outputs a signal to the hydraulic control unit 6 to control the switching of the shift stage of the automatic transmission 5 and the line pressure or accumulator back pressure, while the electronic control unit 12 controls electronically. Signals such as a shift position switch, a pattern select switch for setting a shift pattern, an overdrive switch, a manual shift switch, and an output shaft rotation speed (in other words, vehicle speed) are input to the device 12. The electronic control unit 12
In addition to the above signals, signals such as a brake pedal switch for detecting the depression amount and the depression speed of the brake pedal, a steering steering angle during cornering, and the like are input to the.

Further, the electronic control unit 12 has various running patterns such as normal mode, economy mode,
A shift pattern (specifically, a shift diagram) corresponding to the snow mode, power mode, sports mode, etc. is stored in advance, and the running state of the vehicle detected from the above various input signals, for example, the throttle opening and the vehicle speed. Is determined, and the automatic transmission 5 is controlled based on the running state according to the set shift pattern.

The electronic control unit 12 configured as described above
Is a function of changing the shift pattern according to the road condition detected by the navigation system 7, a function of performing learning control to reflect the traveling state information of the vehicle in the shift pattern, a current road condition and a road condition in front. If the difference is detected, the learning control corresponding to the current road condition is prohibited.

First, the function of changing the shift pattern by the electronic control unit 12 will be described. When the driver operates a switch or the like on the inside of the vehicle to set the traveling mode, a pre-stored basic shift pattern is selected, and the automatic transmission 5 is controlled according to the basic shift pattern. Then, the road condition obtained from the navigation system 7 is judged, and the basic shift pattern is changed to the shift pattern of the control content suitable for the road condition.

The learning control function will be described below.
The traveling state information of the vehicle (including the driving direction of the driver) is determined based on information signals input from various sensors while the vehicle is traveling. Examples of the traveling state information of the vehicle include throttle opening, vehicle speed, accelerator pedal depression speed or depression amount, brake pedal depression frequency, steering steering angle, and the like.

These traveling state information are temporarily stored in the electronic control unit 12, and learning control targets for changing the shift pattern, for example, a shift point at the time of upshifting or downshifting, a hydraulic pressure at the time of switching the shift speed, and a lock. It is reflected in the engagement / release timing of the up clutch.

In the present invention, the method of changing the shift pattern based on the road condition detected by the navigation system 7 or the method of changing the shift pattern by the learning control of the electronic control unit 12 is a basic method. How to replace the shift pattern with another shift pattern,
It is possible to exemplify a method of correcting a basic shift pattern by calculation processing.

Further, the learning control prohibition function will be explained. In the case where the navigation system 7 detects the condition of the road on which the vehicle is going to travel and it is detected that the current road condition and the road condition ahead are different, Prohibit learning control.

In order to achieve each of the above functions, the electronic control unit 12 is provided with a reference value for judging various road conditions detected by the navigation system 7, for example, a corner radius, a slope grade, and a friction coefficient. Etc., a reference value for judging the change of the running state under various road conditions or the driving direction of the driver, for example, the reference depression speed of the accelerator pedal or the brake pedal, the reference depression amount of the accelerator pedal or the brake pedal, the radius of the curve. Data such as the reference steering angle is stored in advance.

Next, a control example of the control device for the automatic transmission will be described with reference to the flow chart shown in FIG.
First, the navigation system 7 inputs the destination of the vehicle and sets the planned road to the destination. Then, the basic shift pattern is set by operating the pattern select switch, and the automatic transmission 5 is controlled based on the running state of the vehicle according to the basic shift pattern. On the other hand, the navigation system 7 detects the current position of the vehicle, and also detects the road condition at the current position and the road condition ahead of the planned road (step 1). Here, “front” refers to an area after a point which is reached after a predetermined traveling time or a predetermined traveling distance from the present location, but the traveling time or the traveling distance can be arbitrarily set.

Then, it is judged whether or not the current road condition is continued (step 2), and if a positive judgment is made in step 2, learning control for updating the shift pattern based on the running state information of the vehicle is performed. It is performed (step 3) and returned. Specific learning control targets performed in step 3 above include, for example, a shift point, a hydraulic pressure at the time of switching a shift speed, and an engagement / release timing of a lockup clutch.

First, when the shift point is controlled, for example, it is detected that the accelerator pedal depression speed due to the driver's direction is faster than a predetermined reference depression speed, and the depression amount is greater than the reference depression amount. If so, a large output torque is required, so the shift point, specifically the upshift point, is moved to the higher vehicle speed side, and the shift pattern is changed to facilitate the use of the lower gear. Learning control is performed. Here, the movement amount of the upshift point is set according to the depression speed and the depression amount of the accelerator pedal.

Next, the case of controlling the hydraulic pressure during shifting will be described. For example, when it is detected that the accelerator pedal depression speed due to the driver's direction is faster than a predetermined reference depression speed, and the depression amount is larger than the reference depression amount, a large output torque and acceleration,
That is, it is considered that a certain degree of deterioration of the shift shock is allowed because a quick shift is required. Therefore, the line pressure and the accumulator back pressure, which are the original pressure for controlling the engagement / disengagement operation of the friction engagement device of the automatic transmission 5, and the friction engagement device on the engagement side in the transitional period of the gear shift operation. Learning control for increasing the engagement hydraulic pressure is performed.

Further, a case where the engagement / release timing of the lockup clutch is controlled will be described. When the lockup clutch is engaged, the fuel consumption is improved and the torque amplification effect is lost, so if long-time running at a low vehicle speed is detected, move the engagement point of the lockup clutch to the high vehicle speed side, Learning control is performed so that the torque amplification action of the torque converter can be exhibited for as long as possible.

If a negative determination is made in step 2, the learning control as described above is prohibited (step 4) and the process is returned. In the above control, at the time of step 1 and step 2, there is a case where the learning control is already performed and a case where the learning control is not performed, but it is detected that the road situation is different when the learning control is already performed. At this point, learning control regarding the current road conditions is prohibited. In this case, it is possible to start new learning control corresponding to the road situation ahead. In other words, it is sufficient if a single learning control is not performed over different road conditions, for example, both flat roads and uneven roads. If learning control is separately performed for each road condition, the road condition There is no problem as the compatibility with the pattern is secured.

The steps 1 and 2 correspond to the road information detecting means of the invention, and the step 4 correspond to the learning control prohibiting means of the invention. According to the above control example, when performing the learning control to reflect the traveling state information of the vehicle in the shift pattern, when it is detected that the current road condition and the road condition in front are different, the current road condition is detected. Since the learning control corresponding to is prohibited, the compatibility between the road condition and the shift pattern is improved, and the running performance and drivability of the vehicle are further improved.

Although the stepped automatic transmission 5 is shown in the above embodiment, the continuously variable automatic transmission known as an automatic transmission is equipped with a pulley and a belt, and the V of the pulley is provided. A belt-type automatic transmission that adjusts the gear ratio by changing the width of the groove, and a gear ratio by adjusting the angle of the power roller with a power roller and disc-shaped input and output discs. A toroidal type automatic transmission may be adopted.

As an example of changing the control contents of the shift pattern performed when the continuously variable automatic transmission is used, the speed reduction ratio is relatively high (low vehicle speed side) or relatively low (high vehicle speed). Control) to change the rotation speed (engine rotation speed, output shaft rotation speed) to the low rotation side or the high rotation side to control the gear ratio, the throttle opening to the high throttle opening side or the low throttle opening For example, changing to the side to control the gear ratio can be exemplified.

[0038]

As described above, according to the present invention, when the learning control for updating the control information of the automatic transmission on the basis of the traveling state information of the vehicle is performed, the current road condition and the road condition in front of If the difference is detected, learning control corresponding to the current road condition is prohibited, so that the compatibility between the road condition and the control information is improved, and the running performance and drivability of the vehicle are further improved.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a control example of a control device for an automatic transmission according to an embodiment of the present invention.

[Explanation of symbols]

 1 Engine 5 Automatic Transmission 6 Hydraulic Control Device 7 Navigation System 11, 12 Electronic Control Device

Claims (1)

[Claims] 1. A control device for an automatic transmission that performs learning control for updating the control information based on control information of the automatic transmission and traveling state information of the vehicle. Road information detecting means for detecting and learning control prohibiting means for prohibiting learning control corresponding to the current road situation when the road information detecting means detects that the current road situation and the road situation ahead are different. A control device for an automatic transmission, comprising: