KR20070023370A - Transmission control time shortening method for auto transmission car - Google Patents

Abstract

The present invention relates to a method for shortening a shift time for an automatic shift vehicle that can improve response by shortening a shift time when the vehicle shifts the speed of the vehicle automatically in an automatic shift vehicle. And performing the maximum line pressure control, checking the APS value if the spot mode is not in the spot mode, and performing the maximum line pressure control if the APS value is above a certain value, and checking the Up Shift pattern value if not above the predetermined value. Performing a maximum line pressure control if the Up Shift pattern value is before a predetermined value and checking a Down Shift pattern if not before a predetermined value; and performing a maximum line pressure control if the Down Shift pattern value is after a predetermined value Checking the vehicle speed change rate if not after the value; and controlling the maximum line pressure if the vehicle speed change rate is above a certain amount or below a certain amount. Checking the APS rate of change if it is not above a certain amount or below a certain amount; and performing maximum line pressure control if the APS change rate is above a certain amount or below a certain amount, and performing variable line pressure control if not above a certain amount or below a certain amount. Including the steps to do.

Vehicle, automatic transmission, pattern, APS, vehicle speed

Description

Transmission control time shortening method for auto transmission car

1 is a graph showing the line pressure of a typical automatic transmission vehicle.

2 is a timing diagram showing a line pressure in a conventional shift control.

3 is a timing diagram showing line pressure in shift control according to the present invention;

Figure 4 is a graph showing the line pressure in the shift control in accordance with the present invention.

5 is a flowchart for explaining a shift control method according to the present invention;

The present invention relates to a method for shortening a shift time for an automatic shift vehicle, and more particularly, to shorten a shift time when automatically shifting a driving speed of a vehicle in an automatic shift vehicle, thereby reducing a shift time for an automatic shift vehicle. It is about a method.

In general, the vehicle is provided with a transmission for adjusting the speed of the vehicle while driving,

Such a transmission is classified into a manual transmission operated by a driver and an automatic transmission automatically shifted according to the traveling speed of the vehicle.

The automatic transmission is a speed that is automatically adjusted by the hydraulic oil filled therein, the LOCK UP CLUTCH control pressure for controlling the hydraulic oil and the shift feeling that the driver feels when the pressure in the line in which the hydraulic oil moves fluctuates stably. There is an urgent need for a sustainable device.

The relationship between the lock up clutch control pressure and the line pressure will be described in detail as follows.

When shifting occurs in an automatic shifting vehicle, the maximum line pressure is used during shifting to ensure a stable shifting feeling. In other words, if there is no shift, keep the low line pressure in general, and then increase the line pressure at the SD POINT to the maximum before the shift occurs, start shifting at SS POINT, and return to the low line pressure again after the shift is completed. Use control to

However, the control that raises the line pressure to the maximum instantaneously for the shifting is advantageous for the shifting control, but it is very disadvantageous for the LOCK UP CLUTCH control. This is because the pressure used to control the lock up clutch is influenced by the line pressure. Table 1 shows the relative relationship.

Table 1

Line pressure LOCK UP CLUTCH CONTROL DUTY LOCK UP CLUTCH control pressure 100 100 100 100 50 50 50 100 50 50 50 25

As shown in Table 1 above, even if the lock up control control duty is the same, the lock up clutch control pressure is completely different according to the line pressure. Therefore, a sudden change in the line pressure during the lock up clutch control causes a bad effect on the control. there was.

The above-described SD POINT means to cross the UP SHIFT LINE on the SHIFT PATTERN when gradually accelerating with a constant APS as shown by the virtual line arrow shown in FIG.

In this way, the time when the vehicle running APS vehicle speed condition passes the shift line on the shift pattern is determined as SD POINT.

Normally, SD (SHIFT DECISION) POINT and SS (SHIFT SIGNAL: Shift Command) POINT match, and start shifting immediately when passing SD POINT.However, in the case of line pressure variable control, as described above, Prepare the shift by raising the line pressure to the maximum with delay time to SS.

In the conventional shift control method, there is no problem when the lock up clutch is completely connected (SLIP = 0) immediately before the line pressure rise (SD POINT) for a sense of shifting during the control of the lock up clutch during the up shift. The problem arises when the SLIP is present just before the line pressure rises.

Looking at the lock up clutch control duty immediately before and after the line pressure increase, there is no big change, but as the line pressure rises rapidly, the lock up clutch control pressure rises sharply. There was a problem that occurred.

In other words, conventionally, as shown in FIG. 2, the fuel consumption is improved by controlling the line pressure appropriate to the engine output (torque) in the in-gear state to give the engine less load than the existing maximum line pressure control. In order to maintain the consistency, the maximum line pressure is maintained before rice rust and shift control is performed at the maximum line pressure.

This control method has a problem in that the shift response is reduced because a control time for increasing the line pressure is added than at the maximum line pressure control.

The present invention is invented to solve the above problems, the object is to control the maximum line pressure or variable line pressure by the driving mode, APS value, shift pattern and vehicle speed change rate selected by the driver to provide a stable shift feeling The present invention provides a method of reducing a shift time for an automatic shift vehicle that can minimize shift times to vary a speed of a vehicle by performing control.

Referring to the characteristic configuration of the present invention for achieving the above object is as follows.

According to an exemplary embodiment of the present invention, a method for reducing a shift time for an automatic shift vehicle may include: performing a maximum line pressure control when a driving mode is a sport mode; and checking an APS value when the driving mode is not a sport mode; and controlling a maximum line pressure control when the APS value is a predetermined value or more. Performing an up shift pattern value if the predetermined value is not greater than a predetermined value; performing a maximum line pressure control if the up shift pattern value is before a predetermined value; and checking a down shift pattern if the upper shift value is not a predetermined value; If the down shift pattern value is after a certain value, the maximum line pressure control is performed, and if it is not after a certain value, the vehicle speed change rate is checked. If the vehicle speed change rate is more than a certain amount or less than a certain amount, the maximum line pressure control is performed. Or checking the APS change rate if it is not below a certain amount, and if the APS change rate is above a certain amount or below a certain amount, Inap perform the control and not the predetermined amount or more, or it is not a predetermined amount or less to the hayeoseo includes performing a variable line pressure control.

Referring to the present invention having such characteristics in detail as follows.

3 is a timing diagram illustrating line pressure during shift control according to the present invention, FIG. 4 is a graph showing line pressure during shift control according to the present invention, and FIG. 5 is a flowchart illustrating a shift control method according to the present invention. to be.

As referred to herein, the control specifications by the control method according to the present invention are as follows.

First, since the shift command is determined by the shift pattern, it applies logic to control the line pressure to be raised in advance in anticipation of the shift pattern (when up or down is expected due to a close to the pattern or a very high vehicle speed and throttle change rate). It was.

Secondly, when choosing a sport mode, the driver's willingness to sporty driving is performed, so the shift response is determined as the priority, so the maximum line pressure control is performed.

Third, when driving over a certain APS, the engine output is increased as the acceleration driving, so the maximum line pressure control is performed.

Referring to the method according to the invention carried out by the above-described control specifications are as follows.

First, the maximum line pressure control is performed in the sports mode, and the APS value is checked in the non-spot mode.

If the APS value is greater than or equal to a predetermined value, the maximum line pressure control is performed, and if it is not greater than or equal to a predetermined value, the Up Shift pattern value is checked.

If the Up Shift pattern value is before a predetermined value, the maximum line pressure control is performed, and if not, the Down Shift pattern is checked.

If the down shift pattern value is after a certain value, the maximum line pressure control is performed, and if it is not after a predetermined value, the vehicle speed change rate is checked.

If the vehicle speed change rate is above a certain amount or below a certain amount, the maximum line pressure control is performed. If the vehicle speed change rate is not above a certain amount or below a certain amount, the APS change rate is checked.

If the APS change rate is more than a certain amount or less than a certain amount, the maximum line pressure control is performed. If the APS change rate is not more than a certain amount or less than the predetermined amount, the variable line pressure control is performed, thereby reducing the shift time.

As described above, the present invention can minimize the shift time for varying the speed of the vehicle by performing the maximum line pressure control or the variable line pressure control based on the driving mode selected by the driver, the APS value, the shift pattern, and the vehicle speed change rate. There is a unique effect that can maintain a stable shift.

Claims (1)

If the driving mode is a sport mode, performing the maximum line pressure control; if not in the spot mode, checking the APS value; if the APS value is above a certain value, performing the maximum line pressure control; Checking the step; if the Up Shift pattern value is before a predetermined value, performing a maximum line pressure control; if not before the predetermined value, checking a Down Shift pattern; and if the Down Shift pattern value is after a predetermined value, the maximum line pressure. Performing control and checking a vehicle speed change rate if not after a predetermined value; and performing maximum line pressure control if the vehicle speed change rate is more than a certain amount or less than a certain amount, and checking the APS change rate if not more than a certain amount or less than a certain amount; If the APS change rate is more than a certain amount or less than a certain amount, the maximum line pressure control is performed. The amount or less or the automatic transmission vehicle transmission time reduction method, characterized in that it comprises the step of performing a variable line pressure control.

Images