JP2002327838A - Shift control method for automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To respond to an acceleration demand without applying a sense of incongruity to a driver when an automatic transmission is manually shifted to D range during acceleration in manual range of the automatic transmission. SOLUTION: The shift control method has a manual shift determination step S101 of determining whether or not a range position has been shifted by manual shifting, a throttle opening determination step S102 of determining whether or not a present throttle opening is larger than a predetermined opening, an acceleration command determination step S103 of determining whether or not there is an acceleration command, a shifting line switching time determination step S104 of determining whether or not a switching time of a shifting line has passed a predetermined time from the manual shifting, and a shifting process step S105 of executing a shifting process responding to the acceleration command by correcting a shift point on a normal shifting line to a high vehicle speed side for just a certain time from the manual shifting when it is determined through the determination steps that the automatic transmission has been manually shifted to a drive range during acceleration in the manual range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission, and more particularly to a shift control method for a manual shift.

[0002]

2. Description of the Related Art An automatic transmission is provided with a transmission having a range position for traveling in an automatic transmission mode and a range position for traveling in a manual transmission mode, and converts a rotational torque generated by an engine into a torque converter. The transmission is transmitted to the transmission via the transmission, and the transmission changes the speed and transmits the transmission to the drive wheels.

In such a transmission,
Traveling in the manual shift mode is enabled by setting the shift position to the manual shift mode range position of "2" or "L".
In addition, by performing a manual shift operation of the shift lever from the manual shift mode range position to the automatic shift mode range position, the gear position suppressed by the manual shift mode is shifted to the automatic shift mode range position, thereby performing an upshift determination. Upshifted to a higher gear.

[0004]

However, during acceleration in the manual shift mode range (range position "2" or "L"), the gear shifts from "2" to "D" and from "L" to "D". Sometimes, the gear may be shifted at the moment of manual shift, and the gear ratio or gear switching timing may not meet the driver's request for acceleration.
For example, during an acceleration, an upshift may occur earlier than the driver's request, such as when the driver manually shifts, and the engine rotation may deviate from the power band and the acceleration force may decrease to meet the driver's request.

[0005] This is because, even in the manual shift mode, when the shift lever moves to shift between the shift speeds in the low speed shift train and the high speed shift train, the "D" range position in the automatic shift mode is changed. This is because the shift lever passes, and the mode may change to the automatic shift mode in spite of the manual shift mode.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, the present invention provides an automatic driving system capable of responding to an acceleration request without giving a sense of incongruity to a driver when a "D" range is set by a manual shift during acceleration in a manual range. It is an object of the present invention to provide a shift control method for a transmission.

[0007]

In order to achieve the above object, a shift control method for an automatic transmission according to the present invention determines whether or not the range position of the automatic transmission has shifted from a manual range to a drive range. A shift determination step to be performed;
An acceleration request determination step of determining a driver's acceleration request;
After the switching time determination step for determining the time since switching from the manual range to the drive range and the above determination steps, during acceleration in the manual range, when it is determined that the shift from the manual range to the drive range is performed, A shift process step of performing a shift process in response to an acceleration request by correcting a shift point on a normal shift line for a high vehicle speed side for a fixed time from the shift.

According to the present invention, when the D (drive) range is set by the manual shift during the acceleration of the automatic transmission in the manual range, the vehicle is shifted from the manual shift to a normal shift point on the high vehicle speed side for a fixed time. The shift is controlled in response to the acceleration request without adding a sense of incongruity to the driver, so that the shift control at the time of the manual shift can be performed.

In the acceleration request determination step, the acceleration request is determined by checking whether the throttle opening is equal to or greater than a predetermined opening or the rate of change of the output shaft speed of the automatic transmission is equal to or greater than a predetermined value. Like that.

According to the present invention, the driver's acceleration request can be reliably determined based on the throttle opening or the rate of change of the output shaft rotation speed of the automatic transmission, and the shift at the time of a manual shift can be performed in response to the acceleration request. Control can be implemented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, during acceleration of an automatic transmission in a manual range, D
When the range is set to the (drive) range, the normal shift point is corrected for a certain period of time from the manual shift to compensate for the high vehicle speed side in response to the acceleration request. The shift control at the time of a manual shift is performed.

Hereinafter, description will be made with reference to an actual shift diagram shown in FIG. Now, in the shift diagram shown in FIG. 2, in the A region, the shift from “L” to “2” is an up region to 2nd (second), but the throttle opening is higher than the fully open position (around 82%). Therefore, it is determined that an acceleration request is made, and the shift line is switched to delay the upshift determination. That is, a shift line obtained by correcting the shift line of “1 → 2” in FIG. 2 toward the high vehicle speed side (slope becomes gentler) so that the engine speed does not exceed the high-speed fuel cut is prepared. The shift line is changed to the shifted line, and the upshift determination is delayed.

In the area B, the shift line is switched as in the area A, but the correction amount to the shift point is changed according to the throttle opening. That is, the correction amount toward the high vehicle speed side is changed according to the degree of the driver's acceleration request.
Further, in the areas C and D, the method of correcting the shift line is changed according to the throttle opening. That is, in the region C where the throttle opening is higher than the fully open position, the shift line is changed to accelerate. That is, the shift point is changed to the output shaft rotation speed at the time of the manual shift + 100 rpm. By doing so, the vehicle speed can be several km from the manual shift.
/ H where the gear is shifted. On the other hand, in the region D where the throttle opening is lower than the fully open position, the shift line is not changed and a normal upshift is determined as a normal shift line.

FIG. 1 is a flowchart for explaining shift line shift control during manual shift of the automatic transmission according to the present invention. First, in the manual shift determination step of step S101, “L” is set in the manual shift →
“2”, “2” → “3”, “3” → “4”, “4” →
It is determined whether or not “D” has been transferred. In the throttle opening degree determination step of step S102, it is determined whether the current throttle opening degree is equal to or more than a fixed value (full opening position = around 82%).

Further, in the acceleration request determination step of step S103, the rate of change of the engine speed NE when the gear is not being shifted is calculated. Then, in the shift line switching time determination step of step S104, the control execution time as a guard timer of the present control, that is, the switching time of the shift line after switching from the manual range to the drive range in step S101 is measured, and when a predetermined time has elapsed. Forcibly ends the shift line correction. That is, here, the switching time is measured by a counter starting from “2” → “D”, and counting up is started between steps S101 and S102 in the flowchart shown in FIG. Then, when a predetermined switching time has elapsed, the control for switching the shift point by the manual shift is terminated, and the shift processing on the normal shift line is performed.

Such determination steps S101 to S1
After step S04, in the shift processing step of step S105, the shift point on the normal shift line is corrected on the high vehicle speed side to execute the shift processing. If NO is determined in steps S101 to S104, a shift process using a normal shift line is performed in the shift process step of step S106. Step S105 or S10
After 6, the target shift control stage is output and the process ends.

In the determination in steps S102 and S103, it may be determined whether or not an acceleration request is made using a vehicle speed signal instead of the throttle opening and the number of revolutions. Further, in the above-described embodiment, the normal shift point is corrected for the high vehicle speed side for a certain period of time after the manual shift so as to respond to the acceleration request. However, the normal mode has a normal shift pattern that emphasizes fuel efficiency. Even before the throttle is returned, the shift line may be changed to a power mode having a shift pattern emphasizing acceleration to respond to the acceleration request, and the same effects as in the above-described embodiment can be obtained.

[0018]

As described above, according to the shift control method for an automatic transmission according to the present invention, when the "D" range is set by the manual shift during acceleration in the manual range, the driver does not feel uncomfortable. It can respond to acceleration requests.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a shift control method for an automatic transmission according to the present invention.

FIG. 2 is a shift diagram illustrating a shift control method for an automatic transmission according to the present invention.

[Explanation of symbols]

 S101 Manual shift determination step S102 Throttle opening degree determination step S103 Acceleration request determination step S104 Shift line switching time determination step S105, S106 Shift processing step

Claims (2)

[Claims] A shift determining step of determining whether or not the range position of the automatic transmission has shifted from a manual range to a drive range; an acceleration request determining step of determining a driver's acceleration request; and a manual range to drive range. A switching time determination step for determining the time since the switching to the above, and, after each of the above determination steps, during acceleration in the manual range, when it is determined that the shift from the manual range to the drive range has been made, a predetermined time after the shift. A shift process step of performing a shift process in response to an acceleration request by correcting a shift point on a normal shift line on a high vehicle speed side. 2. The acceleration request determining step determines an acceleration request by determining whether a throttle opening is equal to or greater than a predetermined opening or a change rate of an output shaft rotation speed of the automatic transmission is equal to or greater than a predetermined value. The shift control method for an automatic transmission according to claim 1, wherein: