JPH0647348B2 - Control device for automatic transmission for vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a control device for an automatic transmission for a vehicle.

<Prior Art> As a conventional example of a control device for an automatic transmission for a vehicle, a shift switching pattern set by a vehicle speed and an intake throttle opening (or an intake negative pressure) is provided, and a detected vehicle speed and an intake throttle valve are provided. There is one that determines a shift stage from the shift switching pattern based on the opening degree and variably controls the shift stage of the automatic transmission.

Further, there is a method in which an operating region where the intake throttle valve is substantially fully opened (hereinafter referred to as a kickdown region) is detected by a kickdown switch. In the kickdown region, the shift stage of the automatic transmission is maintained at the low speed stage until the vehicle speed is higher than in the operating region in which the intake throttle opening is smaller than in the kickdown region (hereinafter referred to as the normal region). It is designed to obtain a sufficiently high output torque.

<Problems to be Solved by the Invention> However, in such a conventional automatic transmission control device for a vehicle, a shift switching pattern is set so that a high output torque can be secured in a kickdown region. Therefore, there were the following problems.

That is, the kickdown switch is turned on when the rear-wheel drive vehicle is suddenly stepped on a road that is curving with a low vehicle and then the accelerator pedal is suddenly depressed to the vicinity of the fully opened intake throttle valve. As a result, the shift switching pattern of the automatic transmission shifts to the kickdown region, so that the output torque sharply increases. Therefore, in a rear-wheel drive vehicle, the steering wheel (front wheel) has a predetermined angle with respect to the straight-ahead direction of the vehicle while the vehicle tries to move straight ahead. Therefore, there is a problem that the vehicle becomes unstable as shown by the broken line, and in the worst case, spins occur, which is dangerous for vehicle running.

The present invention has been made in view of such an actual situation, and it is possible to prevent instability of a vehicle even on a curved road or the like while making it possible to secure a high output torque such as a sudden acceleration operation by using a kickdown region. An object of the present invention is to provide a control device for an automatic transmission for a vehicle.

<Means for Solving Problems> Therefore, according to the present invention, as shown in FIG. 1 as a first invention, a vehicle speed detecting means A for detecting a vehicle speed and an engine load detecting means B for detecting an engine load are provided. , A normal shift switching pattern that is selected when the engine load is less than or equal to a predetermined value and makes the shift switching vehicle speed relatively low, and a kickdown shift that is selected when the engine load exceeds a predetermined value and makes the shift switching vehicle speed relatively high A pattern selecting means C which has at least a switching pattern and which selects the shift switching pattern based on the detected engine load; and an automatic transmission according to the vehicle speed and the engine load detected by the selected shift switching pattern. In a control device for an automatic transmission for a vehicle, which includes shift switching means E for switching a shift stage of D, a steering angle detecting means F for detecting a steering angle of a vehicle, and a detected steering angle. And a prohibiting means G for prohibiting the selection of the kick down shift switching pattern when the angle is equal to or larger than a predetermined value.

In addition to the above configuration requirements, the second aspect of the invention includes steering speed detection means H that calculates or detects the steering speed from the detected steering angle, and kicks according to the steering angle and the steering speed. The downshift switching pattern selection is now prohibited.

<Operation> In this way, on a curved road or the like, the selection of the kick-down shift switching pattern according to the turning angle or the turning angle and the turning speed is prohibited to suppress a rapid increase in the output torque. Therefore, the vehicle can be stabilized and the safety can be improved.

<Embodiment> An embodiment of the first invention will be described below with reference to FIGS.

In the figure, the transmission of the automatic transmission 1 including a torque converter and a transmission is
In order to control the supply of hydraulic oil to speed change elements such as the front clutch, rear clutch, brake band, low & reverse brake, one-way clutch, etc., it is interposed in a hydraulic passage (not shown) led to them and the valve opening duty Solenoid valves 2A to 2E are provided to control the hydraulic oil supply amount by controlling the. A valve opening duty signal from the control device 3 is input to these solenoid valves 2A to 2E.

Further, the control device 3 includes a throttle sensor 4 as an engine load detecting means for detecting the opening degree of an intake throttle valve (not shown).
A vehicle speed sensor 5 for detecting the vehicle speed, and a steering angle sensor 6 as a steering angle detecting means for detecting the steering angle of the steering wheel.
The detection signal is input from the kick down switch 7 and the kick down switch 7.

The control device 3 determines the speed change element of the transmission based on the detection signals of the throttle sensor 4, the vehicle speed sensor 5, and the turning angle sensor 6, and outputs an operation signal to the solenoid bubbles 2A to 2E to output the speed change element of each speed change element. It is configured to perform coupling / uncoupling and shift operation.

Further, the control device 3 is configured to operate according to the flowchart shown in FIG.

Here, the control device 3 constitutes a pattern selection means and a prohibition means, and the control device 3 and the solenoid valves 2A to 2E constitute a shift switching means.

In addition, 8 is an engine main body.

Next, the operation will be described with reference to the flowchart shown in FIG.

At S1, various signals from the throttle sensor 4, the vehicle speed sensor 5, etc. are read. In S2, it is determined whether or not the kick down switch 7 is turned on. If YES, the process proceeds to S3 and NO.
In the case of, it progresses to S5. Here, kick down switch 7
Is turned on in a kickdown region (see FIG. 5) where the intake throttle valve is substantially fully opened, and is turned off in a normal region below (see FIG. 5).

In S3, based on the detected vehicle speed and steered angle, the prohibition condition map is searched for a condition for prohibiting the selection of the kick down shift switching pattern. Here, the prohibition condition map is set by the vehicle speed and the turning angle as shown in FIG. 4, and the turning angle becomes smaller as the vehicle speed increases. Then, the selection of the kick down shift switching pattern is prohibited in the region where the vehicle speed and the steered angle are equal to or greater than a predetermined value (hatched in FIG. 6).

In S4, it is determined whether or not the condition searched in S3 is in the kickdown prohibition range. If YES, that is, if the selection of the kickdown shift switching pattern is prohibited, the process proceeds to S6, and if NO, that is, the selection of the kickdown shift switching pattern is prohibited. If not, proceed to S5.

In S5, the first pattern similar to the conventional example is read from the ROM (or RAM). This first pattern is, as shown in FIG. 5, a kickdown shift switching pattern in which the shift switching vehicle speed is relatively high in the kickdown region and a normal shift switching pattern in which the shift switching vehicle speed is relatively low in the normal region. And have.

On the other hand, in S6, the second pattern is read from the ROM (or RAM). As shown in FIG. 6, the second pattern has only a shift switching pattern corresponding to the normal shift switching pattern of the first pattern, and does not have a portion corresponding to the kickdown shift switching pattern.

In S7, the shift stage of the automatic transmission 1 is determined based on the detected vehicle speed, the intake throttle opening, and the detection signal of the kickdown switch 7 as the first or second pattern, and the operation signals are sent to the solenoid valves 2A to 2E. Shift switching control is performed by outputting (duty signal).

Therefore, when the steering angle is less than a predetermined value, that is, when the vehicle is traveling substantially straight, the automatic transmission is based on the kick down shift switching pattern in the kick down region and based on the normal shift switching pattern in the normal region as in the conventional example. Shift control is performed. Therefore, a high output torque can be secured at the time of sudden acceleration.

On the other hand, when the steered angle is equal to or greater than the predetermined value, that is, when the vehicle is traveling on a curved road, based on the second pattern having no portion corresponding to the kick down shift switching pattern, the vehicle speed, and the intake throttle opening. Shift control of the automatic transmission is performed. For this reason, even if the accelerator pedal is suddenly depressed to near the fully open position of the intake throttle after entering a curved road at a low vehicle speed, the shift switching control by the kick down shift switching pattern is not performed, so that the output torque cannot be rapidly changed. The increase can be prevented. As a result, it is possible to prevent destabilization of vehicle operation due to a sudden increase in output torque that has been conventionally generated.

FIG. 7 shows an embodiment of the second invention. The same elements as those in the above-mentioned embodiment are designated by the same reference numerals as those in FIG. 2 and their explanations are omitted.

That is, in the present embodiment, the control device 11 calculates the turning speed from the turning angle detected by the turning angle sensor 6, and prohibits the selection of the kick down shift switching pattern from the vehicle speed, the turning angle and the turning speed. It was done like this.

Specifically, the turning speed is calculated from the turning angle detected in S12 of the flowchart shown in FIG. Then, when the kick down switch 7 is turned on, in S13, a condition for prohibiting the selection of the kick down shift switching pattern is searched from the prohibition condition map based on the vehicle speed, the turning angle, and the turning angular velocity. In the prohibition map, as shown in FIG. 9, a kickdown prohibition region is set so that the turning angle decreases as the vehicle speed increases, and the kickdown prohibition region increases as the steering speed further increases. Is set to move to the side where the vehicle speed and the turning angle are smaller.

Therefore, the present embodiment has the same effects as the above-described embodiment, and the kickdown prohibited area is moved to the side where the vehicle speed and the turning angle are smaller as the turning angle increases. Even if the steering wheel is suddenly turned with, the selection of the kick down shift switching pattern can be prohibited.

In each of the embodiments, the selection control of the shift switching pattern is performed based on the intake throttle opening, but it may be performed based on the intake negative pressure and the negative pressure change. Further, the shift to the kick down shift switching pattern may be prohibited and the current shift stage may be held.

<Effects of the Invention> As described above, according to the present invention, the selection of the kick down shift switching pattern is prohibited when the turning angle or / and the turning speed is equal to or more than a predetermined value. Since the output torque can be prevented from rapidly increasing even when the accelerator pedal is depressed near the fully open position of the intake throttle valve, the vehicle can be stabilized and safety can be improved.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to claims of the first and second inventions, FIG. 2 is a configuration diagram showing an embodiment of the first invention, FIG. 3 is a flowchart of the above, and FIGS. FIG. 7 is a block diagram showing an embodiment of the second invention, FIG. 8 is a flowchart of the above, FIG. 9 is a diagram for explaining the operation of the same, and FIG. FIG. 6 is a diagram for explaining a drawback of FIG. 1 ... Automatic transmission, 2A-2E ... Solenoid valve,
3, 11 ... Control device, 4 ... Throttle sensor, 5 ...
Vehicle speed sensor, 6 …… Steering angle sensor, 7 …… Kick down switch

Claims (2)

[Claims] 1. A vehicle speed detecting means for detecting a vehicle speed, an engine load detecting means for detecting an engine load, and a normal shift switching pattern for selecting a relatively low shift switching vehicle speed when the engine load is below a predetermined value. A pattern selecting means for selecting the shift switching pattern based on the detected engine load, which has at least a kickdown shift switching pattern which is selected when the engine load exceeds a predetermined value and which makes the shift switching vehicle speed relatively high. And a shift switching means for switching the shift stage of the automatic transmission in accordance with the vehicle speed detected by the selected shift switching pattern and the engine load. And a prohibiting means for prohibiting the selection of the kick down shift switching pattern when the detected steering angle is equal to or greater than a predetermined value. Control apparatus for a vehicular automatic transmission, characterized in that it comprises a. 2. A vehicle speed detecting means for detecting a vehicle speed, an engine load detecting means for detecting an engine load, and a normal shift switching pattern which is selected when the engine load is equal to or less than a predetermined value so that the shift switching vehicle speed is relatively small. A pattern selecting means for selecting the shift switching pattern on the basis of the detected engine load, which has at least a kickdown shift switching pattern which is selected when the engine load exceeds a predetermined value to make the shift switching vehicle speed relatively high. And a shift switching means for switching the shift stage of the automatic transmission according to the vehicle speed detected by the selected shift switching pattern and the engine load. A turning angle detecting means for detecting the turning angle, a turning speed detecting means for calculating a turning speed or a turning speed from the detected turning angle, and a detected turning angle. Calculated or detected control device for a vehicular automatic transmission, characterized in that it and a prohibiting means for prohibiting the selection of the kick-down shift switching pattern according to the steering speed.