JP2566126Y2 - Automatic transmission for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic transmission for a vehicle, and more particularly, to an automatic transmission for a vehicle having control means for performing a shift restriction control.

[Prior Art] In recent years, automatic transmission type vehicles have come to be widely used due to easiness of operation, and this automatic transmission is stored in advance by an electronic control device using a microcomputer. The road surface gradient determined by comparing the actual acceleration with the reference acceleration obtained from the throttle opening (accelerator depression amount), the vehicle speed, and the shift position during traveling from among the plurality of speed change patterns corresponding to the plurality of road surface gradients. There is known an automatic transmission that selects an optimal shift pattern in accordance with the shift pattern and automatically controls the shift of the transmission based on the shift pattern.

However, when the vehicle travels on a road surface where the road surface gradient changes frequently, the above-described automatic transmission frequently switches the shift pattern within a short time every time the gradient changes. Then, there is a drawback that unnecessary shift-up / shift-down is frequently performed by the switching of the shift pattern, and a situation occurs in which acceleration and deceleration are repeated against the driver's will.

Therefore, as a conventional example for solving this disadvantage,
A device disclosed in Japanese Patent No. 10850 has been proposed, and in this device, the above-described drawbacks have been solved by correcting the reference acceleration or the actual acceleration to have hysteresis in switching of the shift pattern. .

[Problems to be solved by the invention]

However, in such a conventional device, it is impossible to cope with all road surface gradients as long as the types of shift patterns are limited.

For this reason, when climbing a gentle slope that can run with part throttle (the state where the throttle is not fully open),
By controlling the throttle, the driver can avoid unnecessary upshifts and downshifts more frequently.However, especially when driving on a gradient that requires the throttle to be fully open, there is still room for the driver to control. However, there is a problem that the acceleration or deceleration, the upshift or the downshift is automatically determined by the running resistance and the driving force determined by the gradient and the vehicle speed.

 This problem will be described in some detail below.

FIG. 3 is a shift map diagram of a normal traveling (D range) shift pattern based on the throttle opening and the vehicle speed, wherein a solid line indicates a vehicle speed upshifting, a dotted line indicates a vehicle speed downshifting, A indicates the speed of shifting down from third speed to second speed, and point B indicates the speed of shifting up from second speed to third speed.

In this shift pattern, the maximum speed at which the vehicle can travel at the third speed on the currently climbing slope is point C, and the maximum speed is two points.
Assuming that the maximum speed at which the vehicle can run at high speed is point D, first, if the throttle is fully opened and acceleration is performed at the second speed from point A, the vehicle speed increases, and at point B, the speed shifts from the second speed to the third speed. . However, since this point B is on the higher speed side than the maximum speed point C at which the vehicle can run at the third speed, the vehicle is stalled due to insufficient driving force, and the vehicle speed tends to decrease to the point C.

However, since the gear shifts down from the third gear to the second gear at the point A before decreasing to the point C, the acceleration starts again at the second gear from the point A, and thereafter, the second gear and the third gear are changed until the gradient changes.
Upshifting and downshifting between speeds are repeated.

This state will be further described with reference to FIG.
B, C and D correspond to points A, B, C and D shown in FIG. Points 点 are points on the curves indicating the driving force of the second and third speeds corresponding to points A and B shown on the curve indicating the running resistance.

Assuming that acceleration starts at the second speed from the point A, the change of the driving force at this time changes from a point on the second speed driving force curve corresponding to the point A to a higher speed side on the curve. And point B
To shift up from the second speed to the third speed, a point on the second speed driving force curve shifts to a point on the third speed driving force curve.

However, since the point on the third speed driving force curve is below the running resistance curve (that is, the range in which the driving force is smaller than the running resistance), the speed decreases from the insufficient driving force to a point on the third speed driving force curve. At the point A corresponding to this point, the gear is shifted down from the third speed to the second speed, so that the vehicle shifts to a point on the second speed driving force curve again and accelerates again. That is, the driving force repeats the point →→→→.

In order to prevent such repetition of upshifting / downshifting, the shift pattern is changed to a normal traveling (D range).
If the gear is switched to a shift pattern (two ranges) in which the upshift to a high gear is limited as shown in FIG.
In this case, there is another problem that the driver is forced to perform a manual selection operation.

Accordingly, an object of the present invention is to realize an automatic transmission for a vehicle that can prevent repetition of upshifting and downshifting against the driver's will while climbing a slope with the throttle fully open.

[Means for solving the problem]

In order to achieve the above object, an automatic transmission for a vehicle according to the present invention includes a means for detecting a fully open state of an engine, an automatic transmission, and a shift to the automatic transmission when the fully open state of the throttle is detected. When it is detected by the signal that the upshift and downshift have been repeated a set number of times within a predetermined time, the upshift in the automatic transmission is inhibited, and then the inhibited state is continued until the throttle is fully opened. Control means.

[Action]

In the present invention, when the control means determines that the throttle has been fully opened from the output of the engine fully-opened state detection means, the control means uses a shift signal sent to the automatic transmission to shift up a predetermined number of times within a set time. / Determine whether or not downshifting has been repeated.

If it is determined that the operation has been repeated a predetermined number of times within the set time, the shift-up is prohibited, and the prohibition state is continued until it is determined from the output of the detection means that the throttle is no longer fully opened.

With this, the control means can perform upshifting / shifting against the driver's will that occurs when climbing a hill with the throttle fully open.
Unnecessary repetition of downshifting is prevented.

〔Example〕

FIG. 1 is a view showing the configuration of an embodiment of an automatic transmission for a vehicle according to the present invention, wherein 1 is an engine, 2 is an accelerator pedal, and 3 is a throttle fully open state detecting means attached to the accelerator pedal 2. Throttle fully open detection switch,
Reference numeral 4 denotes a throttle valve which is directly or indirectly operated by the accelerator pedal 2 to control fuel supplied to the engine 1.
Reference numeral 5 denotes an automatic transmission (T / M), and reference numeral 6 denotes a controller as control means for controlling the automatic transmission 5 based on the output of the full throttle detection switch 3. The throttle sensor 7 for detecting the opening of the throttle valve 4 may be used as the throttle fully open state detecting means.

FIG. 2 is a flowchart of a program stored and executed in the controller shown in FIG. 1. Hereinafter, the operation of the configuration shown in FIG. 1 will be described based on FIG.

When this program (subroutine) starts,
The controller 6 includes a throttle fully open state detection switch 3.
Alternatively, the output of the throttle sensor 7 is read to check whether or not the throttle valve 4 is fully opened (step in FIG. 2).
S1).

When it is determined that the automatic transmission 5 is fully opened, the number (n) of shift (up / down) commands given to the automatic transmission 5 from the controller 6 within a predetermined time is checked (step S).
2). The number of shift-up / shift-down operations is actually repeated between adjacent gears.
This is because the vehicle speed does not increase rapidly particularly on a steep slope.

When it is determined that n = i (the set number of times) (step S3), upshifting is prohibited (step S4). That is, no shift command is given to the automatic transmission 5.

Here, the setting time and the predetermined number of shifts will be described. The predetermined time may be set to 30 seconds, and the set number of shifts may be set to about three times. This is because it is unlikely that the shift-up / shift-down operation will be performed in such a short time in a normal state. It is considered that there is not.

Next, the number of shifts is checked again (step S
5) It is verified that the shift-up / shift-down is not repeated (n = 0) (step S6).

Then, in this state, it is checked from the output of the throttle sensor 7 or the throttle fully open state detection switch 3 whether or not the throttle valve 4 has been released from the fully open state by the driver starting to release the accelerator pedal 2 (step S7). When it is determined that the vehicle is not fully opened, the shift-up prohibition is released (step S8).
Terminate this program.

[Effect of the invention]

As described above, according to the automatic transmission for a vehicle according to the present invention, when it is determined that the throttle is fully opened and it is determined that the set number of shift-ups / downshifts has been repeated within a predetermined time, the throttle fully-opened state is released. Upshifts are prohibited so that when the vehicle is going uphill with the throttle fully open, it is possible to prevent repeated acceleration / deceleration due to upshifting / downshifting against the driver's will, and to prevent accidental failure due to unnecessary shifting. It can also be prevented.

In addition, in the conventional automatic transmission for vehicles, when the vehicle is going uphill with the throttle fully open, it is necessary to perform a select operation by the driver, which is necessary to prevent repetition of acceleration and deceleration due to shift-up / shift-down contrary to the driver's will. Since there is no such operation, simpler and smoother operation can be performed, and at the same time, fatigue can be reduced and the effect of improving safety can be obtained.

Further, since the repetition frequency of shift-up / shift-down is detected, upshifting is not prohibited when traveling on a flat road or the like without such repetition, so that rapid acceleration can be started immediately.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of an automatic transmission for a vehicle according to the present invention, FIG. 2 is a flowchart diagram of a program executed by a controller of FIG. 1, and FIG. Fig. 4 is a shift map diagram showing a pattern, Fig. 4 is a graph diagram for explaining a relationship between running resistance and driving force with respect to a shift speed, and Fig. 5 is a shift map diagram showing a shift pattern when upshifting to a high gear is restricted. ,. In FIG. 1, 1 ... engine, 2 ... accelerator pedal, 3 ... full throttle open state detection switch, 4 ... throttle valve, 5 ... automatic transmission, 6 ... controller, 7 ... throttle sensor. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Scope of request for utility model registration] A throttle opening state detecting means for the engine, an automatic transmission, and when the throttle opening state is detected, a predetermined number of shift-ups and down-shifts are performed within a predetermined time by a shift signal to the automatic transmission. Control means for prohibiting upshifting in the automatic transmission upon detecting the repetition, and thereafter continuing the prohibition state until the throttle fully open state is released. Automatic transmission.