KR20040060305A - Method for controlling initial fill time of automatic transmission - Google Patents

Abstract

PURPOSE: An initial fill time control method of an automatic transmission is provided to improve shift quality and durability by controlling the initial fill time, to quicken the initial clutch stroke speed when interlock occurs. CONSTITUTION: An initial fill time control method of an automatic transmission comprises steps of calculating a variation(delta Na) of turbine rpm(revolutions per minute) of a first set section(A) if a vehicle starts traveling, power-on up shift occurs, and the shift control signal is output(101,103); calculating a variation(delta Nb) of the turbine rpm of a second set section(B) from the first set time(105); calculating a variation(delta Nc) of the turbine rpm to set time(C) from a point of time where release-side control starts(107); sensing occurrence of interlock of the automatic transmission from the variations calculated from the former steps, setting up 1 as the value of interlock if interlock occurs, and setting up zero as the value of interlock if interlock doesn't occur(109¯119); checking the satisfying state of the initial fill time learning control conditions of the shift state(121); checking whether the turbine rpm has changed excessively through an indicator(123); checking whether an interlock value is 1, if the turbine rpm has not changed excessively(125); executing shift control through a subtraction learning method about the clutch fill time, if the turbine rpm has not changed excessively and the interlock value is 1(129); and executing learning control about the initial fill time if the turbine rpm has changed excessively(127).

Description

METHOD FOR CONTROLLING INITIAL FILL TIME OF AUTOMATIC TRANSMISSION}

The present invention relates to an initial fill time control method of an automatic transmission, and more particularly, due to the difference between the application side hydraulic pressure and the release side hydraulic pressure during the power-up shift shifting during a vehicle equipped with the automatic transmission, An initial fill time control method of an automatic transmission for preventing a shift shock that occurs by controlling an initial fill time of an application side duty when a change is made.

In general, a vehicle equipped with an automatic transmission controls the hydraulic pressure within a shift range set according to the driving speed of the vehicle so that the shift gear of the target shift stage may be automatically operated.

Therefore, the torque converter is operated according to the output power of the engine to control the rotational force of the fluid, and according to the control signal applied from the shift control device so that the shift gear according to the operating state of the vehicle can be operated. The hydraulic pressure acts on the valve to allow shifting.

Therefore, a vehicle equipped with an automatic transmission in which the operating state is controlled according to the hydraulic pressure does not require the operation of a clutch pedal to cut off power from the engine in order to change the operating state of the corresponding shift gear. Fatigue can be reduced, and an engine stall does not occur due to malfunction or inexperience of a driver while driving, so that even a beginner can easily operate a driving operation.

Therefore, the automatic transmission receives a fluid pressure from the oil pump by changing the port according to the selected position of the driver's shift lever, and the operating state of the hydraulic valve is changed by the fluid pressure so that any one of the gear stages of the transmission gear mechanism is shifted. Controls the operating state of the hydraulically actuated friction element for selecting stages.

The action of the planetary gear arrangement is switched in accordance with the selective operation of the friction element consisting of a clutch or brake, which is then transmitted to the drive gear after an appropriate transmission ratio is made.

When the shifted power is transmitted to the drive gear, the shifted power is transmitted to the driven gear geared to the longitudinal reduction gear by the drive gear coupled to the drive gear, thereby controlling the rotational operation of the wheel.

As described above, when the target gear shift stage is determined according to the driving state of the vehicle, and the control operation to the determined target gear shift stage is performed, a corresponding friction element is operated for each target gear shift stage among the friction elements including clutches or brakes. Let's do it.

In a vehicle equipped with the automatic transmission operating as described above, if the application side hydraulic pressure is rapidly supplied before the release side hydraulic pressure is released during power-up shift, an interlock is provided inside the automatic transmission momentarily during the power-on up shift. A problem occurs that the driver feels a shift shock.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to adjust the initial fill time to speed up the initial clutch stroke speed when an interlock occurs, thereby improving the speed and durability of the automatic transmission. It is to provide an initial fill time control method.

The present invention for achieving the above object,

a) calculating the amount of change (tlt Na) of the number of revolutions of the turban at the first set time (A) from the time of outputting the shift control signal when the vehicle starts to travel and a power-on up shift shift occurs to output the shift control signal; ;

b) calculating an amount of change delt Nb of the number of revolutions of the turban in the second setting section B from the first setting time;

c) calculating an amount of change (delt Nc) of the number of revolutions of the turban for a set time (C) from the time when the release side control is started;

d) detecting the occurrence of the interlock of the automatic transmission from the changes in the number of revolutions of the turban calculated from the steps a) to c) and setting the interlock value to 1 when an interlock is generated, and setting the interlock value to 0 when no interlock is generated. ;

e) checking whether an initial fill time learning control condition of the shift state is satisfied;

f) checking whether the turban rotation speed is excessively changed through an indicator which determines that the initial fill time learning control condition is satisfied in step e) and recognizes the change in turban rotation speed;

g) executing learning control for the initial fill time when it is determined in step f) that the turban speed has changed excessively and checking whether it is in the interlock state when it is determined that the turban speed has not changed excessively; And

h) if it is determined that the interlock state, it is characterized in that it comprises the step of reducing the stroke speed of the clutch by performing subtraction learning control for the initial fill time.

Preferably in the initial fill time control method of the automatic transmission according to an embodiment of the present invention, the step d,

Step d)

d-1) checking whether the current turban rotation speed is larger than the change amount of the first turban rotation speed + lower limit setting value of the step a) and smaller than the change amount of the first turban rotation speed step of the a) step + the upper limit setting value;

d-2) When the current turban rotation speed in step d-1) is greater than the change amount of the first turban rotation speed in the step a) + an upper limit setting value, the change amount of the turban rotation speed in the step b) is less than or equal to the application side setting value. Or checking whether it is less than or equal to the release-side setting value of the change amount of the turban revolution in step c);

d-3) in step d-2) is smaller than the change amount of the first turban rotation speed in step a) + the upper limit setting value, and the change amount in the turban rotation speed in the step b) is equal to or less than the application side setting value, or c Determining that an interlock is not generated when the amount of change in the number of revolutions of the turban rotation is less than or equal to the release-side set value; And

d-4) When the current turban rotation speed in step d-1) is greater than the change amount of the first turban rotation speed in the step a) + an upper limit setting value, the change amount of the turban rotation speed in the step b) is less than or equal to the application side setting value. It is characterized in that it comprises a step of determining that the interlock is generated if not or less than the release-side set value of the change amount of the turban rotation of step c).

According to the present invention, by adjusting the initial fill time of the application side duty to remove the instant interlock state generated in the automatic transmission due to the difference between the hydraulic pressure on the release side and the application side hydraulic pressure, By eliminating shift shocks, the shift and durability of the automatic transmission can be further improved.

1 is a diagram showing the configuration of a control device of an automatic transmission to which the present invention is applied.

2 is a graph showing the relationship between the turban rotation speed, the release side duty ratio, and the application side duty ratio according to the present invention.

3 is a flowchart illustrating an initial fill time control process of an automatic transmission according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: driving state detection device 11: throttle valve opening amount detection unit

13: vehicle speed detection unit 15: shift stage detection unit

17: turban speed detection unit 19: engine speed detection unit

20: shift control

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the configuration of a shift control apparatus of an automatic transmission to which the present invention is applied. In the shift control apparatus of the automatic transmission to which the present invention is applied, as shown in Figure 1, the driving state detection device for outputting a corresponding electric signal by receiving a signal that is output by varying the state of the vehicle according to the driving state of the vehicle 10 and the initial fill time of the application side duty is adjusted to remove the shift shock caused by the difference between the application side hydraulic pressure and the release side hydraulic pressure by reading and receiving the signal output from the driving state sensing device 10. The shift control unit 20 is made.

Here, the driving state detecting device 10 detects the opening degree of the throttle valve whose opening and closing state is variable in conjunction with the operation state of the accelerator pedal, and outputs a corresponding signal to the throttle valve opening amount detecting unit 11 and the vehicle. The vehicle speed detection unit 13 detects the traveling speed and outputs a corresponding signal, and when the shift stage is changed according to the throttle valve opening amount and the vehicle speed, the shift stage detects the variable state of the shift stage and outputs a corresponding signal. The detection unit 15, the turbine rotation speed detection unit 17 for detecting the rotational speed of the turbine shaft connected to the input shaft of the transmission and outputs a corresponding signal, and the rotational speed of the crankshaft variable according to the operating state of the engine The engine speed detection unit 19 detects and outputs a corresponding signal.

An initial fill time control method of the automatic transmission made by the above configuration will be described with reference to FIGS. 2 and 3.

When the vehicle starts driving and a power on up shift shift occurs, the shift control unit 20 transmits a power on up shift shift control signal for shifting the shift stage to the target shift stage, as shown in FIG. 2. SS) is output (step 101).

First, the shift control unit 20 detects a change rate of the initial turbine rotation speed. That is, the shift control unit 20 determines the rate of change of the first turban revolution speed delt Na of the first setting section A from the time point SS at which the shift control signal of FIG. 2 is output to the setting time IF. Calculation (step 103).

In other words, the first turban rotation speed change rate (delt Na) = the first turban rotation speed (Na) / 'A' interval time ... Equation 1

In addition, the shift control unit 20 calculates the second turban rotation speed change rate (delt Nb) in the 'B' section time of FIG. 2 from the time IF when the application side duty ratio becomes DA1 (step 105).

That is, the second turban rotation rate change rate (delt Nb) = first turban rotation speed Nb / 'B' section time satisfies Equation 2.

Then, the shift control unit 20 calculates the third turban rotation speed change rate delt Nc from the time point RB at which the release duty ratio is 100% to the time point 'C' in FIG. 2 (step 107).

That is, the third turban rotation rate change rate (delt Nc) = first turban rotation speed Nc / 'C' section time satisfies Equation 3.

Then, the shift control unit 20 checks whether the current number of revolutions (Nt) of the turban is smaller than the value added by the first amount of change in the number of revolutions (delt Na) and a predetermined lower limit set value (Nlow) (step 109). Here, when it is determined that the value is smaller than the sum of the first turban rotation speed change amount (delt Na) and the preset lower limit setting value (Nlow), the first turban rotation speed change amount (delt Na) and the preset upper limit setting value (Nhigh) It is checked if it is larger than the added value (step 111).

If it is determined in step 111 that the first turban rotation speed change amount (delt Na) and the predetermined upper limit set value (Nhigh) is less than the value added, the second turban rotation speed change rate (delt Nb) is the application-side set value (Step 113), and if it is determined that it is not equal to or less than (Napp), it is checked whether the third turban rotation rate change rate (delt Nc) is less than or equal to the release-side set value (Nrel) ( Step 115). If it is determined in step 115 that it is not equal or smaller, it is determined that the automatic transmission is not in an inter lock state and the interlock value is set to 0 (step 117).

However, it is determined that the step is greater than the sum of the first turban rotation speed change delt Na and the preset lower limit set value Nlow in step 109, or the first turban rotation speed change delt in step 111. It is determined that it is larger than the value obtained by adding Na) and the preset upper limit set value Nhigh, or in step 113, the second turban rotation speed change rate delt Nb is determined to be smaller than or equal to the application-side set value Napp, If it is determined in step 115 that the third turban rotation speed change rate delt Nc is less than or equal to the release-side set value Nrel, it is determined that the automatic transmission is in an interlock state and the interlock value is set to 1 (step 119).

That is, the current turban rotation speed Nt <the first turban rotation speed change amount (delt Na) + a predetermined lower limit set value (Nlow) is satisfied, and the current turban rotation speed (Nt)> the first turban rotation speed change amount ( delt Na) + satisfies a preset upper limit setpoint (Nhigh), satisfies the second turban revolution rate (delt Nb) < = application side setpoint (Napp), and meets the third turban revolution rate (delt). Nc) <= When the release-side set value Nrel condition is satisfied, an interlock state is determined. The interlock value is 1 if the above conditions are met, and the interlock value is 0 if the above conditions are not met.

Then, the shift control unit 20 checks whether the condition for controlling the shift is satisfied through the clutch fill time learning method (step 121), and if the fill type learning control condition is satisfied, the change in the number of revolutions of the turban If it is determined that the turban rotation speed has changed drastically by using an indicator (not shown) capable of recognizing (step 123), it is checked whether the interlock value is 1 (step 125). ).

Here, if the turban rotation speed is not excessively changed and the interlock value is 1, if the shift control is executed through the subtraction learning method for the clutch fill time (step 129) and the turban rotation speed is changed rapidly, Perform learning control (step 127).

As described above, the initial fill time control method of the automatic transmission according to the present invention, in order to eliminate the instantaneous interlock state generated in the automatic transmission due to the difference between the hydraulic pressure on the release side and the application side hydraulic pressure. By adjusting the initial fill time of the application side duty so that the clutch stroke speed is improved, the shift shock generated at the beginning of the shift is eliminated, thereby further improving the shifting feeling and durability of the automatic transmission.

While the invention has been shown and described with respect to specific preferred embodiments thereof, the invention is not limited to the embodiments described above, and is commonly used in the art to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Anyone with knowledge will be able to make various variations.

Claims (2)

a) calculating the amount of change (tlt Na) of the number of revolutions of the turban in the first set time (A) from the time of outputting the shift control signal when the vehicle starts driving and a power-on up shift shift occurs to output the shift control signal; ; b) calculating an amount of change delt Nb of the number of revolutions of the turban in the second setting section B from the first setting time; c) calculating an amount of change (delt Nc) of the number of revolutions of the turban for a set time (C) from the time when the release side control is started; d) detecting the occurrence of the interlock of the automatic transmission from the changes in the number of revolutions of the turban calculated from the steps a) to c) and setting the interlock value to 1 when an interlock is generated, and setting the interlock value to 0 when no interlock is generated ; e) checking whether an initial fill time learning control condition of the shift state is satisfied; f) checking whether the turban rotation speed is excessively changed through an indicator which determines that the initial fill time learning control condition is satisfied in step e) and recognizes the change in turban rotation speed; g) executing learning control for the initial fill time when it is determined in step f) that the turban speed has changed excessively and checking whether it is in the interlock state when it is determined that the turban speed has not changed excessively; And and h) reducing the stroke speed of the clutch by performing subtraction learning control for the initial fill time if it is determined in step g). The method of claim 1, wherein step d) d-1) checking whether the current turban rotation speed is larger than the change amount of the first turban rotation speed + lower limit setting value of the step a) and smaller than the change amount of the first turban rotation speed step of the a) step + the upper limit setting value; d-2) When the current turban rotation speed in step d-1) is greater than the change amount of the first turban rotation speed in the step a) + an upper limit setting value, the change amount of the turban rotation speed in the step b) is less than or equal to the application side setting value. Or checking whether it is less than or equal to the release-side setting value of the change amount of the turban revolution in step c); d-3) in step d-2) is smaller than the change amount of the first turban rotation speed in step a) + the upper limit setting value, and the change amount in the turban rotation speed in the step b) is equal to or less than the application side setting value, or c Determining that an interlock is not generated when the amount of change in the number of revolutions of the turban rotation is less than or equal to the release-side set value; And d-4) When the current turban rotation speed in step d-1) is greater than the change amount of the first turban rotation speed in the step a) + an upper limit setting value, the change amount of the turban rotation speed in the step b) is less than or equal to the application side setting value. Or c) determining that an interlock is generated if the change amount of the number of revolutions of the turban rotation speed is not equal to or less than the release-side setting value in the step c).