JPS62278351A - Control device for automatic speed change gear - Google Patents

Abstract

PURPOSE:To improve the operating performance of an engine by changing the altered quantity of a speed change pattern which a pattern changing means alters on the basis of result detected by an engine load detecting means to make the speed change possible under a running state in which the speed change is prohibited. CONSTITUTION:An automatic speed change gear B is controlled by a transmission controlling means D on the basis of value detected by a running state detecting means A in accordance with plural established speed change patterns. The speed change controlling means D also controls a pattern changing means F according to the operating state of a vehicle to alter the speed change pattern for speed change control. In this case, an engine load detecting means G is provided to detect the engine load, and an altered quantity changing means H changes the altered quantity of the speed change pattern altered by the pattern changing means F on the basis of the engine load detected by the said detecting means G. Therefore, the automatic speed change control can be executed keeping excellent operating performance.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a control device for an automatic transmission that changes a shift pattern.

[Prior Art] Conventionally, the shift pattern of automatic transmissions has been determined with emphasis on fuel efficiency in low to medium engine load regions, and on power performance in medium to high engine load regions. The above-mentioned shift patterns (upshift pattern, downshift pattern) are provided with hysteresis between the upshift point and the downshift point in order to prevent shift hunting (frequent shifting). However, when the operating condition of the vehicle is special, such as when driving in mountainous areas or cornering, the above-mentioned shift pattern causes shift hunting or unexpected downshifts, resulting in poor drivability.

Therefore, in order to prevent shift hunting, the shift pattern of the automatic transmission is conventionally adjusted based on the operating state of the vehicle, such as the vehicle speed, the cornering state of the vehicle, the shift frequency of the automatic transmission, the engine temperature, or the amount of change in the engine load. A technique for changing this is disclosed (Japanese Unexamined Patent Publication No. 58-34257). This technique detects, for example, the steering angle of a steering wheel, and if the steering angle of the steering wheel is large, the seventh
As shown in the figure, change the downshift pattern in the arrow YA force direction (increase the hysteresis of the shift pattern)
It is something. That is, the downshift pattern consisting of the vehicle speed and throttle opening is changed to a lower speed side, thereby making it difficult for a downshift to occur during cornering, thereby improving drivability.

Similarly, devices that change the shift pattern for the purpose of preventing shift hunting include those that prohibit shifting when the frequency of shifting of automatic transmissions increases, those that prevent shifting on slopes, and those that prevent shifting on slopes, and those that prevent shifting on slopes. There have been proposals for changing the shift pattern depending on the pedal depression speed.

[Problems to be Solved by the Invention] However, in the conventional technique of changing the shift pattern described above, the following problems may occur. In other words, in the above-mentioned conventional technology, the shift pattern is changed so that a downshift does not occur when cornering, for example, so a downshift is not performed when cornering on a steep uphill road that requires a large drive torque. do not have. For this reason, when more driving torque is required, downshifting is not performed until the vehicle speed decreases, resulting in a problem of reduced drivability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic transmission control (a'Il) device that controls an automatic transmission that changes the shift pattern in a manner that better matches the driving conditions of the vehicle.

[Means for Solving the Problems] As a means for solving the above problems and achieving the object of the present invention, as shown in FIG. A pattern setting means C has a plurality of speed change patterns set for the transmission B, and a pattern setting means C sets a plurality of speed change patterns for the automatic transmission B. According to the speed change pattern set in the pattern setting means C, the automatic transmission B a shift control means for controlling the shift of the vehicle; an operating state detection means E for detecting the operating state of the vehicle; and a pattern change for changing the shift pattern used for the small shift control of the shift control means according to the operating state of the vehicle. Means E: In the control device for an automatic transmission, engine load detecting means G detects the load on the engine, and based on the load on the engine, the amount of change in the shift pattern changed by the pattern changing means is determined. The gist of the present invention is a control device for an automatic transmission, characterized by comprising: change amount switching means H for switching;

The vehicle operating state detecting means E detects, for example, the cornering state of the vehicle, the frequency of shifting of the automatic transmission, the engine temperature, or the rate of change in engine load.

Pattern changing means means, for example, a means for changing the shift pattern when the vehicle is cornering to make it difficult to shift, a means for changing the shift pattern to make it difficult to shift when the frequency of shifting of an automatic transmission increases, etc. .

The engine load detection means G means, for example, the throttle opening,
It detects the pressing force on the accelerator pedal, etc.

The change amount switching means is a means for making downshifts and other gear changes more likely to occur, for example, in areas where the engine load is large, and is a means for changing the shape of the throttle cam or changing the shift pattern in the computer. It is.

[Operation] In the present invention, according to the shift pattern set in the pattern setting means C, the shift control means controls the automatic shift BIB based on the detected value of the driving state detection means A. A pattern changing means F changes the speed change pattern used for speed change control by the speed change control means in accordance with the detected value of the operating state detecting means E. And engine load detection means G
Based on the detected value, the shift control means H switches the pattern change amount of the pattern change means F.

Therefore, even if, for example, the shift pattern is changed during cornering to make it difficult to downshift, the shift pattern is changed and a downshift is performed when the vehicle is traveling on a hill where the engine load is high.

[Example] An embodiment of the present invention is shown in FIGS. 2 to 6 below.

In FIG. 2, 10 is an engine and 20 is an automatic transmission. The automatic transmission 20 includes a solenoid valve 21a.

Hydraulic pressure is controlled by energizing and de-energizing 21b and 2Lc, thereby enabling four-speed shifting.

The control circuit 30 controls the solenoid valves 218.21b and 21C4.
The control circuit 30 is arranged in various parts of the vehicle including the engine 10 and the automatic transmission 20, and is driven by signals from sensors and switches.
A signal is being input.

These sensors or switches include a throttle opening sensor 14 that detects the opening of the throttle valve 13 arranged in the intake passage 11 of the engine 10, an engine rotation speed sensor 16 that detects the rotation speed of the engine 10, and a vehicle speed sensor 14 that detects the opening of the throttle valve 13 disposed in the intake passage 11 of the engine 10. A vehicle speed sensor 22 that detects the rotational speed of the output shaft 20C of the automatic transmission 20 proportional to , a shift position sensor 23 that detects the shift position, a brake sensor 24 that detects the operation of a brake (not shown), and the state of an overdrive switch (not shown) an overdrive sensor 25 that detects whether or not overdrive (4th gear) can be used; a pattern select switch that instructs the shift pattern; a cruise control switch 27 that instructs automatic drive; a steering wheel that detects the steering angle (not shown) It consists of a steering angle sensor 28 and a /D switch 29 for instructing whether kickdown is possible.

The control circuit 30 is constituted by a well-known microcomputer, that is, CPU31, RAM32, ROM3
3, an input port 34, an output port 35, a common bus 36, etc. The input port 34 receives signals from the above-mentioned sensors through a pulse input section 36a,
36b and directly. 41 magnetic valve drive parts 38a, 38b, 3 to the output port 35
8C is connected. In the ROM 33, a flowchart as shown in FIG. 3 is stored, as well as shift patterns shown in FIGS. 4 to 6, etc.

The control circuit 30 inputs various control conditions,
Shifting up and downshifting the automatic transmission 120, changing the transmission pattern, etc. are performed.

Next, this embodiment will be explained using the flowchart shown in FIG. In this flowchart, first, the vehicle speed is inputted (step 100), and the throttle opening degree is inputted (step 110'), which is necessary depending on the running state of the vehicle.

Next, the operating state of the steering angle is input (step 120).Then, a kickdown switch (K/D S/W) signal is input to change the amount of change based on the engine load (STELLA). 7130>. After inputting each of the above signals, in order to switch the pattern change amount according to the engine load,
It is determined whether the kickdown switch (K/D S/W) 29 is instructing kickdown (switch "on") (step 14o).

If the /D S/W 29 instructs kickdown, the shift pattern A1 shown in FIG. 4, which will be described later, in which downshifting is most likely to occur is set in the shift control map (step 150). Then, according to the shift pattern A1, it is determined whether or not a shift is possible based on the vehicle speed in the running state and the throttle opening (step 160), and if a shift is necessary, the solenoid valve drive units 38a to 38G are activated. Then, the solenoid valves 21a to 21G are driven to change gears (step 170). That is, the steps 140-1
．． At 70, a shift is performed in accordance with the throttle opening, which is the engine load.

On the other hand, if kickdown is not instructed (step 140), it is determined whether or not the cornering state is present by determining whether the steering angle is greater than or equal to a predetermined angle (step 1
80) If the vehicle is cornering, shift pattern B in which downshifts are unlikely to occur over the entire engine load range shown in FIG. 6, which will be described later, is set in the map (step 190).
). Next, it is determined whether or not the gear can be changed (step 160).
), if a shift is required, a shift output is output from the control circuit 30 to the automatic transmission 20 (step 170).

On the other hand, if the kickdown is not instructed (step 140) and the cornering condition is not present (step 180), the shift pattern described later, which is a shift pattern in which downshifts are likely to occur in the low to medium engine load range, is selected. According to the /D S/W "off" region (shift pattern that does not use a large throttle opening range) of shift pattern A2 shown in FIG. When necessary, a shift output is output from the control circuit 30 to the automatic transmission 20 (
step 170).

Shift pattern 1 in FIG. 4 has an upshift pattern shown as a solid line and a downshift pattern shown as a dotted line, and is the one in which downshifting is most likely to occur.

The shift pattern A2 in FIG. 5 has a shift pattern in which it is difficult to downshift in the /D S/W "off" region, that is, in the region where the engine load is large, when the shift is judged at a predetermined throttle opening or less. It is set. In other words, in the shift pattern A2, /D S/Wr off.
In this range, downshifts no longer occur under high engine load conditions.

In the shift pattern B shown in FIG. 6, in the K/D S/W "off" region, a downshift hardly occurs when the engine load changes.

That is, by using the shift pattern B, downshifts hardly occur in medium to high engine load ranges.

By using the present embodiment described above, even if downshifting is prohibited during cornering, downshifting becomes possible as the engine load increases on a hill or the like. Therefore, according to this embodiment, it is possible to provide a control device for an automatic transmission that changes an automatic transmission whose shift pattern is changed according to the operating state of the vehicle when a change in the shift pattern is required, for example, when the engine load is large.

In this embodiment, the means for detecting the cornering state of the vehicle may be determined by detecting the steering angle, or by using the rotation difference between the left and right front wheels or rear wheels, or the lateral acceleration of the vehicle. . Furthermore, in this embodiment, the operating state of the vehicle includes the frequency of shifting of the automatic transmission, engine water temperature, engine lubricating oil temperature, engine block salt, hydraulic oil temperature of the automatic transmission, accelerator pedal depression speed, or engine load. The speed change pattern may be switched based on the engine load by detecting the rate of change in the engine load. In other words, if the engine water temperature, engine lubricating oil temperature, engine block salt, or automatic transmission hydraulic oil temperature is low, the shift pattern is changed and upshifting to a predetermined gear or higher is prohibited. , when the engine water temperature becomes high, the shift pattern of the automatic transmission may be switched to a shift pattern that allows upshifting. In addition, if the speed at which the accelerator pedal is depressed or the speed at which the engine load changes is too large, the shift pattern may be changed and the shift may be prohibited, or when the engine load becomes large, the automatic transmission may The shift pattern may be switched to a shift pattern that allows shifting.

[Effects of the Invention] In the present invention, according to the shift pattern set in the pattern setting means C, the shift control means controls the automatic transmission B based on the detected value of the driving state detection means A. A pattern changing means F changes the speed change pattern used for speed change control by the speed change control means in accordance with the detected value of the operating state detecting means E. Then, based on the detected value of the engine load detection means G, a change amount switching means switches the pattern change amount of the pattern change means F.

Therefore, for example, when the shift pattern is changed during cornering to make it difficult to downshift, when the engine load increases, the shift pattern is changed and a downshift is performed. In other words, by switching the amount of shift pattern change based on the engine load, even if downshifting is prohibited during cornering, downshifting is possible when cornering and on a steep slope. As a result, when the driving condition of the vehicle requires a shift, even if the shift is prohibited depending on the operating state of the vehicle, the control device of the automatic transmission can perform the shift, resulting in high drivability. I can provide it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic structure of the automatic transmission control device of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG.
4 is a graph showing the shift pattern A1 of this embodiment, FIG. 5 is a graph showing the shift pattern A2 of this embodiment, and FIG. 6 is a graph showing the shift pattern A2 of this embodiment. A graph showing shift pattern B, FIG. 7, is a graph for explaining conventional control. A... Running state detection means B... Automatic transmission C... Pattern setting means D... Shift control means E... Operating state detection means F... Pattern changing means G... Engine load Detection means H... Change amount switching means 10... Engine 14... Throttle opening sensor 16... Engine rotation speed sensor 20... Automatic transmission 28... Steering angle sensor 29... K/D switch 30...control circuit

Claims (1)

[Scope of Claims] 1. A driving state detecting means for detecting the driving state of the vehicle; a pattern setting means for setting a plurality of shift patterns of an automatic transmission; and a method according to the shift pattern set in the pattern setting means. , a speed change control means for controlling the speed change of the automatic transmission based on the detected value of the driving state detection means; an operation state detection means for detecting the operating state of the vehicle; and a speed change control means for controlling the speed change according to the operating state of the vehicle. A control device for an automatic transmission comprising: pattern changing means for changing a speed change pattern used for speed change control; engine load detection means for detecting engine load; and pattern changing means for detecting engine load based on the engine load. A control device for an automatic transmission, comprising: change amount switching means for switching the change amount of a shift pattern to be changed; 2. The control device for an automatic transmission according to claim 1, wherein the operating state of the vehicle is a cornering state of the vehicle, a shift frequency of the automatic transmission, an engine temperature, or a rate of change in engine load.