KR100316916B1 - Shift controlling methode for automatic transmission of vehicle - Google Patents

Abstract

When the vehicle speed of the vehicle driving at three speeds is low, the gear shift is performed by setting the shift pattern differently according to the change in the oil temperature, so as to prevent the occurrence of shift shock during shifting.

After detecting the throttle opening degree, the vehicle speed, and the oil temperature during the 3-speed driving, it is determined whether the detected oil temperature is equal to or higher than the set reference oil temperature.

If it is determined that the detected temperature of the oil temperature is higher than or equal to the set reference oil temperature, it is determined whether the vehicle is lower than or equal to the set reference vehicle speed, and if so, it is determined whether the shift stage is shifting from kick down 3 to 2, and the shift stage If it is determined that the kick-down 3 → 2 shift is in progress, the 3 → 1 down skip shift is controlled by applying the second shift pattern.

Accordingly, when the vehicle driving in the third speed is kicked down 3 → 2 with high temperature at low speed, the newly shifted second shift pattern is applied to the shift stage to perform 3 → 1 down skip shift control. One-way clutch (OWC) operation at 1 speed prevents shift shock due to run-up.

Description

SHIFT CONTROLLING METHODE FOR AUTOMATIC TRANSMISSION OF VEHICLE}

The present invention relates to a shift control method of an automatic transmission for a vehicle, and more particularly, by setting down a downshift line of a shift stage during high temperature low speed driving, a run-up due to a lack of line pressure due to a decrease in oil pump discharge at high temperature of high temperature. The present invention relates to a shift control method of an automatic transmission for a vehicle for preventing occurrence of a (RUN-UP).

For example, the automatic transmission applied to a vehicle is controlled by the shift control device controlling a plurality of solenoid valves to control hydraulic pressure according to the driving speed of the vehicle, the opening ratio of the throttle valve, and various detection conditions. To make the shift.

In other words, when the driver changes the select lever to the desired gear range, the manual valve port is changed and the hydraulic pressure supplied from the oil pump is selectively operated according to the duty control of the solenoid valve. Let this be done.

The automatic transmission operated according to this operating principle has a friction element that is deactivated in the operating state when the shift to the target shift stage is performed, and a friction element that is converted from the deactivation state to the operating state. Since the shift performance of the automatic transmission is determined according to the timing of deactivation and start of operation of these friction elements, recent studies on shift control methods for better shift performance have been actively conducted.

In view of the technical background of the present invention, the shift control of the automatic transmission according to the driving state of the vehicle upshift shift control in which the shift is sequentially made from the 1st speed, which is the full speed, to 4th speed, and 1 from the 4th forward speed. There are downshift shifting control in which shifting is sequentially performed up to the second speed, and downskip shifting control in which downshifting is performed from 4th speed to 2nd speed, 3rd speed to 1st speed, and the like. Related to.

That is, when the vehicle speed is traveling at a low speed in a vehicle traveling at three speeds, the shift stage is conventionally changed according to the change in the throttle opening Th and the vehicle speed No as shown in FIG. 4 regardless of the oil temperature. → 2 → 1 Kickdown shifting was performed.

However, if the oil temperature is low-speed running at high temperature in the three-speed driving state as described above, if the initial initial temperature value is insufficient due to the short time shifting speed at low speed, the run-up at the end of the shift is insufficient due to the lack of clutch control hydraulic pressure at the coupling side. The problem is that it occurs easily.

That is, in general, when the oil temperature is in the high temperature state, the oil pump discharge amount is lowered, thereby increasing the frequency and size of the run-up occurrence, thereby including a problem in that the shift speed is reduced.

Accordingly, an object of the present invention is to solve the above problems, when the vehicle speed of the three-speed running vehicle is a low speed, by setting the shift pattern in accordance with the change in the oil temperature to perform the shift, run generated at the end of the shift It is to provide a shift control method of an automatic transmission for a vehicle that can prevent the up-up.

1 is a block diagram of a shift control apparatus of an automatic transmission applied to the present invention.

2 is a flowchart illustrating a shift control method of an automatic transmission according to the present invention;

3 is a shift pattern diagram of an automatic transmission applied to the present invention.

4 is a shift pattern diagram of a conventional automatic transmission.

The present invention for realizing this step, after the vehicle detects the throttle opening degree, the vehicle speed and the oil temperature during the three-speed running, and determining whether the detected oil temperature is above the set reference oil temperature;

If it is determined that the temperature of the oil temperature detected in the step is equal to or greater than the set reference oil temperature, determining whether the vehicle is less than or equal to the set reference vehicle speed;

When it is determined that the shift stage is in the kickdown 3 → 2 shifting step, the second shift pattern may be set to control 3 → 1 downskip shifting.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can realize the above object will be described in detail.

1 is a block diagram of a shift control apparatus of an automatic transmission for a vehicle according to the present invention, wherein a throttle valve opening degree Th 11, a vehicle speed 12, and an oil temperature ATF vary according to a driving state of a vehicle. The vehicle driving state detecting means 10 for detecting the change of the vehicle 13 and the vehicle driving state signal detected by the vehicle driving state detecting means 10 are subjected to the low speed driving at a high temperature when the vehicle being driven at high speed is kicked. If it is determined whether the shift is in the down 3 → 2 shift, and the shift stage is determined to be the kickdown 3 → 2 shift, the control signal for shifting is controlled by setting the second shift pattern to control the shift stage 3 → 1 downshift. The shift control apparatus 20 outputs and the drive means 30 which is controlled by the shift control signal output from the said shift control apparatus 20 and downshifts a shift stage from 3 speeds to 1 speed.

The shift control method of the vehicle automatic transmission having the above-described configuration will be described in detail with reference to FIGS. 2, 3, and 4.

In a vehicle equipped with an automatic transmission in which a shift stage is automatically shifted according to a driver's operation state, the shift control apparatus 20 for controlling the automatic transmission by a preset program is a vehicle driving state sensing means 10. The control signal is output (S100).

Accordingly, the vehicle driving state detecting means 10 includes a throttle valve opening amount Th and a vehicle speed detected by the throttle valve opening degree detecting unit 11, the vehicle speed detecting unit 12, and the oil temperature detecting unit 13 of the vehicle traveling at three speeds. ) And the detected value of the oil temperature (ATF) are transmitted to the shift control apparatus 20.

Therefore, the shift control apparatus 20 receives the detected values of the throttle valve opening amount Th, the vehicle speed No, and the oil temperature ATF input from the vehicle driving state detecting means 10 to read (S110), It is determined whether the oil temperature (ATF) value is higher than the preset value T1 of the reference oil temperature (S120).

When it is determined that the value of the oil temperature ATF of the vehicle driving at the third speed is higher than the preset value T1 of the reference oil temperature, the shift control apparatus 20 detects a vehicle speed detected by the vehicle driving state sensing means 10. ) Determines whether the preset reference vehicle speed (No11) or less (S130).

If it is determined that the vehicle speed No detected by the vehicle driving state detecting means 10 is driving below the preset reference vehicle speed No11, is the shift control apparatus 20 outputting a kick-down 3 → 2 shift control signal? Determine (S140).

The oil temperature ATF detected by the vehicle driving state detecting means 10 is a high temperature higher than the preset reference oil temperature T1, and the detected vehicle speed No is lower than the preset reference vehicle speed No11. If it is determined that the kick-down 3 → 2 shift control signal is output while driving, the shift control apparatus 20 is shown in FIG. 3 to prevent the run-up generated during the kickdown 3 → 2 shift. A shift control signal for setting a second shift pattern map that is newly set and stored in a memory and skipping the shift stage from three speeds to one speed according to the set second shift pattern map to the driving means 30. Output (S150).

The second shift pattern map may include a kick-down 3 → 2 shift pattern and a kick-down 2 → 1 shift pattern at a point where an arbitrary throttle opening degree Th coincides with a vehicle speed No. Shift pattern map configured to be skipped down to 1 speed.

Therefore, the driving means 30 is controlled by a control signal set and output by the second shift pattern map stored in the memory in the shift control apparatus 20 to downshift the shift stage from 3 speeds to 1 speed. By adjusting the control pressure to make the adjustment, the line pressure supplied to the engagement side clutch is adjusted.

In addition, when the shift stage is controlled at one speed, the one-way clutch (O.W.C: One Way Clutch) is operated to perform one speed control.

However, it is determined that the detected oil temperature value (ATF) of the vehicle is lower than the preset oil temperature value (T1), the detected vehicle speed (No) is higher than the preset reference vehicle speed, or the shift stage is not shifting the kick-down 3 → 2 during 3-speed driving. When the shift control apparatus 20 applies the first shift pattern illustrated in FIG. 4, the shift control apparatus 20 performs the shift control.

The present invention relates to a shift control method of an automatic transmission for a vehicle. When a vehicle traveling at three speeds is subjected to a kick-down 3 → 2 shift with a high temperature at a low speed, a shift stage is applied by applying a newly set second shift pattern. By controlling the 3 → 1 down skip shift control, it is possible to prevent the run-up caused by the One Way Clutch (OWC) operation during shifting, thereby preventing the shift shock occurring at the end of the shift.

Claims (1)

In the shift control method of the automatic transmission for a vehicle, Detecting the throttle opening degree, the vehicle speed, and the oil temperature of the vehicle in the three-speed driving state of the vehicle; Comparing whether the detected temperature of the oil temperature is higher than or equal to a set reference oil temperature; Comparing whether the detected vehicle speed is equal to or less than the set reference vehicle speed when the temperature of the oil temperature detected in the comparing step is equal to or greater than the set reference oil temperature; Detecting whether the shift stage is in a kick-down 3 → 2 shift if the vehicle speed detected in the vehicle speed comparison step is equal to or less than a set reference vehicle speed; If the shift stage detected in the shift detection step is during the kickdown 3 → 2 shift, the kickdown 3 → 2 shift pattern and the kickdown are performed at a point where an arbitrary throttle opening value Th and an arbitrary vehicle speed value No match. And performing a 3 → 1 down skip shift control by applying a shift pattern map that is set such that the shift stage is skipped down from 3 speed to 1 speed due to a 2 → 1 shift pattern. Shift control method.