JPH03234963A - Control device for automatic transmission - Google Patents

Abstract

PURPOSE:To sufficiently meet the requirements of a driver by detecting the frequency of switching over to the other speed change patterns from one speed change pattern, and thereby providing a means changing a restoring condition which permits the other speed change patterns to be changed into the aforesaid one pattern in response to the aforesaid frequency. CONSTITUTION:The frequency detecting means 5f of a speed change control means 5 computes frequency based on signals from a speed change pattern switching means 5b, a generating condition for restoring signals generated by a restoring signal generating means 5c is changed when the aforesaid frequency exceeds a specified reference. The change of a condition, for example, permits the opening of a throttle valve for requiring a range B to be changed to a low opening side by a specified quantity, and also concurrently permits a delay in time which causes the restoration of a change pattern in this range, to be lengthened by a specified time. In addition, the 3.5/8 section of the opening of the throttle valve for determining a range (c) is changed to a low opening side by a specified quantity and the delay in time is lengthered by a specified time. Namely, when an operation in a power mode is carried out, frequency for restoring an economy mode from the power mode is thereby lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for an automatic transmission for a vehicle. In particular, the present invention relates to a control device for an automatic transmission for a vehicle, which includes a transmission mechanism having a plurality of gears, and a speed change control means that selects the gear of the transmission mechanism according to the driving state of the vehicle. More specifically, the present invention provides a plurality of types of shift patterns for selecting the gear position of the transmission mechanism according to the driving condition of the vehicle, and automatically switches the shift pattern according to the driving condition of the vehicle. This invention relates to a control device for an automatic transmission.

[Prior Art] In an automatic transmission for a vehicle that is equipped with a transmission mechanism having a plurality of gear stages and selects the gear stage of the transmission mechanism according to the driving condition of the vehicle, the gear stage of the transmission mechanism is selected. A shift control device is already known that has an economy mode pattern in which the shift is performed at a relatively low speed and a power mode pattern in which the shift is performed at a relatively high speed. It is also known that in such an automatic transmission control device, the shift pattern is automatically switched depending on the driving conditions of the vehicle. For example, Japanese Patent Publication No. 51-22698 discloses a control system that detects the acceleration state of the vehicle based on the rate of change of the engine throttle valve opening and switches the shift pattern from economy mode to power mode when the acceleration state is detected. An apparatus is disclosed. Further, Japanese Patent Publication No. 57-8983 discloses a control device which switches a shift pattern from an economy mode to a power mode when the engine throttle valve opening is equal to or greater than a predetermined value.

[Problem to be solved by the invention]

In the conventional automatic transmission control device described above, switching of the shift pattern is determined only based on relatively limited conditions such as a vehicle acceleration request and an engine output request.

However, because the desired shift pattern varies depending on the individuality of the driver and the road conditions, conventional shift pattern switching cannot adequately meet the driver's demands.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a control device for a vehicle automatic transmission that can switch a shift pattern closer to the driver's intention.

[Means to solve the problem]

In a control device for an automatic transmission having a plurality of shift patterns, the present invention detects the frequency at which a shift occurs from one shift pattern to another shift pattern, and changes the shift pattern from one shift pattern to another shift pattern according to the detected frequency. The control means is provided with return condition changing means for changing the return conditions for returning to the two speed change patterns. More specifically, the present invention includes:
This is a control device for an automatic transmission for a vehicle, including a transmission mechanism having a plurality of gears, and a shift control means for selecting a gear of the transmission mechanism according to the driving state of the vehicle. The shift control means has a plurality of shift patterns in which gears are switched at different speeds, and when a switching condition that requires switching from one shift pattern to another shift pattern is detected, the shift control means changes the shift pattern to - The shift pattern is switched from one shift pattern to another shift pattern, and when a condition for returning from the other shift pattern to the two shift patterns is detected, the shift pattern is returned to the two shift patterns. A feature of the present invention is that the control means includes a frequency detection means for detecting the frequency of switching from one shift pattern to another shift pattern, and changes the above-mentioned return condition according to the detected frequency. .

The present invention is applicable to a control device having a control means equipped with an economy mode shift pattern in which the gears are switched at a relatively low speed and a power mode shift pattern in which the gears are switched at a relatively high speed. In that case, the features of the present invention are realized in the return control in which the shift pattern is returned from the power mode to the economy mode. That is, in the automatic transmission control device according to this aspect, the control means includes a frequency detection means for detecting the frequency at which the shift pattern is switched from the economy mode to the power mode, and a frequency detection means for detecting the frequency at which the shift pattern is switched from the economy mode to the power mode, and a shift pattern for the power mode according to the detected frequency. The present invention is characterized by comprising a return condition changing means for changing a return condition under which a return from a shift pattern to an economy mode shift pattern is required.

[For production]

According to the present invention, when switching from one shift pattern to another shift pattern is frequently performed, it is determined that the driver desires to drive in the other shift pattern. Under this condition, it is made difficult for the vehicle to return from the other shift pattern to the - two shift patterns, thereby making it easier for the vehicle to travel in the other shift pattern.

〔Example〕

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

First, referring to FIG. 1, the automatic transmission 2 attached to the engine 1 is composed of a torque converter section 2a coupled to the output shaft of the engine 1 and a multi-gear type transmission mechanism 2b, The stage is a solenoid valve 3a,
It is selected by the oil pressure from the hydraulic circuit 4 controlled by 3b, 3c, and 3d. For controlling the hydraulic circuit 4, a speed change control means 5 is provided which supplies a control current to each of the solenoid valves 3a, 3b, 3c, and 3d.

The speed change control means 5 is a throttle valve 1a of the engine 1.
a throttle valve opening detector 1b that detects the opening of the
It receives a signal from a vehicle speed detector 2d that detects the rotational speed of the output shaft 2c of the automatic transmission 2 as the vehicle speed, and generates a control signal according to the driving state of the vehicle. The speed change control means 5 can be constituted by a microcomputer, and has a storage means 5a that stores a speed change pattern according to the driving state of the vehicle. This storage means 5a stores a plurality of different shift patterns.

FIG. 2 shows an example of a shift pattern stored in the storage means 5a. FIG.
) indicates a power mode shift pattern in which the shift is performed at a relatively high speed. In this embodiment of the invention, the storage means 5a
has two types of shift patterns: economy mode and power mode.

The shift control means 5 has a shift pattern switching means 5b for switching the shift pattern read out from the storage means 5a according to the driving conditions of the vehicle. A speed change signal generating means 5C is connected to the speed change pattern switching means 5b, and this speed change signal generating means 5C generates a speed change signal so that the speed is changed according to the driving condition of the vehicle based on the selected speed change pattern. generated and gives this shift signal to the solenoid valve. The speed change pattern switching means 5b normally reads out the speed change pattern of the economy mode, but when a switching condition is detected, changes the speed change pattern to the power mode. For this purpose, the shift control means 5 is provided with a switching condition signal generating means 5d. Further, when a condition for returning to the economy mode is detected while controlling with the shift pattern of the power mode, the shift pattern switching means 5b returns the shift pattern to the economy mode. For this purpose, the speed change control means 5 is provided with a return signal generation means 5e.

FIG. 3 shows a map of shift pattern switching conditions and return conditions. Region A is a power region where the throttle valve opening is larger than 7/8, and in this region, the power mode is always selected as the shift pattern. In region B, the vehicle speed is a predetermined value, for example, 55 km/h, and the throttle valve opening is 5.
The area is smaller than /8. Further, region C is within a predetermined range of vehicle speed, for example, 30 to 55 km/h,
and the throttle valve opening is in a range smaller than 3.5/8, and the vehicle speed is lower than a predetermined value, for example, 30 km/h,
This region includes a range in which the throttle valve opening degree is smaller than 1.5/8. The switching conditions for switching the shift pattern from the economy mode to the power mode are when the operating state of the vehicle is in region A and when the opening speed of the engine throttle valve, that is, the accelerator depression speed of the vehicle is equal to or higher than a predetermined value. When this switching condition is met, the shift pattern is switched from economy mode to power mode. The return condition for returning the shift pattern from power mode to economy mode is when a predetermined period of time, e.g. 0.65 seconds has elapsed since the driving state of the vehicle entered the range C, or a predetermined period of time e.g. It is established when .0 seconds have elapsed. When this return condition is met, the shift pattern is switched from power mode to economy mode.

As described above, in this embodiment of the present invention, the economy mode shift pattern and the power mode shift pattern are appropriately selected and used depending on the driving conditions of the vehicle. Furthermore, according to a feature of the present invention, the speed change control means 5 is provided with a frequency detection device f&5f that detects the frequency at which the speed change pattern is switched from the economy mode to the power mode.

This frequency detection means 5f is a shift pattern switching means 5.
The frequency is calculated in response to the signal from b, and when the frequency exceeds a predetermined standard, the conditions for generating the return signal generated by the return signal generating means 5e are changed. This condition change involves, for example, changing the opening of the throttle pulse 12 which defines region B to a lower opening by a predetermined amount, and at the same time setting a delay time of 0.65 seconds to cause the shift pattern to return in this region. Quantitative length, for example, by 0.1 seconds. In addition, the throttle valve opening degree that defines region C is 3.5/
8 portion is changed to the low opening side by a predetermined amount, for example, ⅛ opening, and the delay time is lengthened by, for example, 0.1.

FIG. 4 is a flowchart showing the control for switching the speed change pattern in this embodiment of the invention. First, it is determined whether the shift pattern has been switched to power mode or not. If the shift pattern has not been switched, it remains as is, and if it has been switched, 1 is added to the constant C to create a new constant C.
Then, the process moves on to determining whether a predetermined period of time has elapsed. If it is determined that the predetermined time has not elapsed, the process continues as is; if it is determined that the predetermined time has elapsed, 1 is subtracted from the constant C to obtain a new constant C, and the process proceeds to the next step. In this step, the constant C is compared with a predetermined value A, and if the constant C is greater than the predetermined value A, the return condition is changed; if it is smaller, the return condition is changed. Next, the constant C is compared with a predetermined value B that is smaller than the predetermined value A, and when the constant C becomes smaller than the predetermined value B, the return condition is returned to its original state.

In addition, in the above embodiment, the return conditions are changed by a predetermined amount at a time when restoring the return conditions to the original state all at once, but the setting of the change amount may be reversed, and both may be changed by a predetermined amount or all at once. You may also do so. Further, in the above embodiment, all the shift lines are shifted to change the shift pattern, but only some shift lines may be changed.

With the above control, the return conditions for the shift pattern to return from power mode to economy mode are changed depending on the frequency of switching from economy mode to power mode. By reducing the number of times the shift pattern is returned from the power mode to the economy mode, it is possible to achieve shift control that suits the driver's preference.

3 4 [Effect] In the present invention, when switching from one shift pattern to another shift pattern occurs frequently as described above, conditions for returning from the other shift pattern to the two shift patterns are set. Since the shift pattern is changed, the operating range according to the other shift pattern becomes wider, and it becomes possible to perform shift control that matches the driver's intention.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a control device for an automatic transmission for a vehicle showing an embodiment of the present invention, FIGS. 2(a) and (b) are charts showing examples of shift patterns, and FIG. 3 is a diagram showing shift pattern switching. FIG. 4 is a flowchart showing an example of control in an embodiment of the present invention. 1...Engine, 2...Automatic transmission,
2a...Torque converter, 2b...Multi-stage transmission, 4...Hydraulic circuit, 5
...speed change control means, 5a...memory means, 5b
... Speed change pattern switching means, 5 C... Speed change signal generation means, d... Switching signal generation means, e... Return signal generation means, f... Frequency detection means. 6

Claims (2)

[Claims] (1) A transmission mechanism having a plurality of gears, and a shift control means for selecting a gear of the transmission mechanism according to the operating condition of the vehicle, and the shift control means is capable of switching the gears at different speeds. When a plurality of shift patterns are detected and a switching condition that requires switching from one shift pattern to another shift pattern is detected, the shift pattern is switched from the one shift pattern to the other shift pattern, and the other shift pattern is switched to the other shift pattern. A control device for an automatic transmission comprising: pattern switching means for returning a shift pattern from the other shift pattern to the one shift pattern when a return condition for returning the shift pattern from the other shift pattern to the one shift pattern is detected; a frequency detecting means for detecting the frequency at which the control means switches from the one shift pattern to the other shift pattern; A control device for an automatic transmission, comprising a return condition changing means for changing a return condition. (2) A transmission mechanism having a plurality of gears, and a shift control means for selecting a gear of the transmission mechanism according to the driving state of the vehicle, and the shift control means switches the gears at a relatively low speed. Detects an economy mode shift pattern in which a shift occurs, a power mode shift pattern in which gears are changed at a relatively high speed, and a shift condition that requires a shift from an economy mode shift pattern to a power mode shift pattern. When a return condition is detected that requires a return from the power mode shift pattern to the economy mode shift pattern, the shift pattern is returned from the power mode to the economy mode. A control device for an automatic transmission having a mode switching means, wherein the control means includes a frequency detection means for detecting the frequency at which a shift pattern is switched from an economy mode to a power mode; 1. A control device for an automatic transmission, comprising: return condition changing means for changing return conditions for returning from a shift pattern to an economy mode shift pattern.