KR100279471B1 - Kickdown 3-speed 2-speed power off downshift shifting control method - Google Patents

Abstract

The present invention relates to a control method for shifting the power-down downshift at 2nd speed at kickdown speed. When power is turned off during the 2nd speed control at 3rd speed on, the initial duty D1 is set in the map stored in the memory. Set the output time and duty slope to output the corresponding duty control signal to suppress the rise of turbine RPM (Nt) and to make the kickdown band reach the operating state quickly. When the down switch is turned off, the initial duty D2 is set in the 2nd speed map from the kickdown 3rd speed stored in the memory, the duty slope and the duty output time are set to α% / Sec to output the corresponding duty control signal, and the shift When the gear is synchronized to the 2-speed gear, all outputs of the duty control are terminated. There is an effect that it is possible to reduce the shock in byeonsokgam to improve and enhance the ride comfort.

Description

Kickdown 3-speed 2-speed power off downshift shifting control method

The present invention relates to a two-speed power-off downshift shift control method at kickdown three speeds, and more particularly, a shift shock that occurs when a power state is turned on and off during a two-speed shift from kickdown three speeds while a vehicle is driving. The present invention relates to a two-speed power-off downshift shift control method for reducing the speed of the kickdown.

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 controller so that the shift gear according to the operating state of the vehicle can be operated. 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 selective operation of the friction element consisting of a clutch or a brake switches the operation of the planetary gear unit, 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 which is geared to the longitudinal reduction gear by the driven gear which is geared to the drive gear to control the rotational operation of the wheel.

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

In the automatic transmission vehicle operating as described above, when the state of the power is turned off during the power-on 3-speed 2-speed kickdown shift, conventionally, the 2-speed control is performed at the power-off 3 speed.

However, in the above-described conventional technique, since the synchronous determination is made before the kickdown band is controlled by the increase in the rotational speed of the turbine, at this time, the sub pressure (hereinafter referred to as S / A: SUB APPLY) is applied to the inlet by the inflow of the line pressure. The clutch (hereinafter referred to as F / C: FRONT CLUTCH) forms a back pressure, which causes a problem of shift shock.

Therefore, in order to solve the above-mentioned conventional problem, when the power state is turned off during the power-on 3-speed 2-speed shift control, the initial duty D1 is set in the map stored in the memory and the duty output time and the duty slope are set. It outputs a duty control signal to suppress the increase of turbine RPM (Nt) and to make the kickdown band reach the operating state quickly.The kickdown band is operated and stored in the memory when the kickdown switch is turned off at the time. Set the initial duty D2 on the 2nd speed map at Kickdown 3rd speed, set the duty slope and duty output time to α% / Sec, and output the corresponding duty control signal. By terminating the outputs of all the above duty control, the shift shock generated during the 2-shift downshift shifting from the 3-speed shift on the power-on kickdown is reduced to improve the shifting feeling. , To provide a 2-speed power-off down-shift speed change control method in the third kick down has the effect to improve the riding comfort.

According to an aspect of the present invention, there is provided a vehicle comprising: determining whether a state of power is on; When the state of the power is changed to off rather than on, the initial duty D1 stored in the second speed control map at the kickdown third speed of the memory is set, and the duty output signal is set by setting the duty output time and the duty gradient. Outputting; Determining whether the kick-down switch is turned off by outputting the duty control signal; If the kickdown switch is turned off, smoothly controlling the kickdown band by outputting a corresponding duty control signal at a duty initial value D2, a duty gradient, and a duty output time α% / Sec stored in a memory; Judging whether the kick-down band is smoothly controlled and whether the shift stage has made a 2-speed synchronization determination; In the above-described shift stage, when the second speed synchronization is determined, the control of the duty D2 outputted above is characterized in that it is made.

FIG. 1 is a block diagram of a kickdown 3-speed 2-speed power-off downshift shift control apparatus according to an embodiment of the present invention.

2 is a flowchart illustrating a method of controlling a two-speed power-off downshift shifting method according to an exemplary embodiment of the present invention.

3 is a diagram illustrating a kick-down three-speed power-down downshift shift control duty pattern diagram according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention, which can be achieved and realized in detail by the above objects, will be described in detail with reference to the accompanying drawings.

As shown in the accompanying FIG. 1, the configuration of the 2nd speed power-down downshift shift control apparatus according to the kickdown 3rd speed according to the embodiment of the present invention is applied by receiving a signal that is varied and output according to the driving state of the vehicle. A vehicle driving state sensing means 10 for outputting a signal; When the state of the power is turned off during the power-on 3-speed 2-speed shift control by reading the signal output from the vehicle driving state sensing means 10 and outputting the corresponding duty D1 stored in the memory, the number of revolutions of the turbine It suppresses the rise of (Nt), allows the kickdown band to reach the operating state quickly, and outputs the duty D2 set in memory to smoothly control the kickdown band when the kickdown band is activated. Control means 20 for terminating all duty control if determined; It consists of a driving means 30 for synchronizing the shift stage to the target shift stage by receiving a control signal output from the control means 20.

In the above, the vehicle driving state detection means 10, the throttle valve opening degree detection unit 11 for detecting the degree of opening 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; A vehicle speed detector 12 which detects a driving speed of the vehicle and outputs a corresponding signal; A shift stage detecting unit 13 for detecting a variable state of the shift stage and outputting a corresponding signal when the shift stage is changed according to the throttle valve opening amount and the vehicle speed; An engine rotation speed detection unit 14 for detecting a rotation speed of the crankshaft which is varied according to an operating state of the engine and outputting a corresponding signal; A turbine shaft rotational speed sensing unit 15 for sensing a rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputting a corresponding signal; Kickdown switch detection unit 16 for detecting the time when the kickdown band is started for the time control of the transmission hydraulic pressure control.

When the vehicle performs the 2-speed shift control at the 3rd speed of the power-on kickdown while driving, the control means 20 determines whether the power is on (S100).

When the state of the power is on in the above, the control means 20 performs a second speed control routine at the third feed back speed of section A, as shown in the accompanying Figure 3 (S200).

However, when the state of the power is changed to OFF in the above, the control means 20 is the initial duty D1 of the section B stored in the 2nd speed control map at the 3rd speed kickdown of the memory as shown in the accompanying FIG. Setting the duty output time and the duty gradient, outputting the corresponding duty control signal to the driving means 30 to suppress the increase in the rotation speed Nt of the turbine, and the kick-down band reaches the operating state quickly (S110). ).

The control means 20 determines whether the kick-down switch is turned off according to the output of the duty control signal so that the kick-down band reaches the operating state quickly (S120).

Since the kickdown switch is turned off because the kickdown band is operated, the control means 20 is shown in FIG. 3 attached with the duty initial value D2, the duty gradient and the duty output time α% / Sec stored in the memory. As shown in the C section, the output to the driving means 30 with the duty control signal to smoothly control the kickdown band (S130).

However, if the kickdown switch is still on, the process returns to step S110 of continuously outputting the corresponding duty control signal until the kickdown switch is turned off.

As the kick-down band is smoothly controlled in the above, the control means 20 determines whether the shift stage second speed synchronization determination is made (S140).

In the above-described method of determining the shift stage second speed synchronization determination, the value (No) of the output shaft rotation speed, which is the vehicle speed, is calculated with the second speed gear ratio, and the value is calculated, and the value calculated above is converted into the turbine rotation speed (Nt). Is calculated and calculated, and if the calculated value is less than or equal to the rotation speed value Ntb2 of the target turbine, it is determined that the shift stage second speed synchronization determination has been made.

No × 2 Gear Ratio-Nt ≤ Ntb2

(No is the output shaft speed, Nt is the turbine speed, and Ntb2 is the speed of the target turbine.)

When the shift stage is completed at the second speed, the control means 20 ends the duty control output from S130 (S150).

However, when the second speed synchronization determination is not made in the above, the control means 20 returns to step S130 of continuously outputting the duty control signal until the synchronization determination is made.

The above embodiments are described as the most preferred embodiments, and the present invention is not limited thereto, and the embodiments can be easily described from the above embodiments.

As described above, in the embodiment of the present invention, when the state of the power is turned off during the 2-speed shift control at the third speed on, the initial duty D1 is set in the map stored in the memory, and the duty output time and the duty slope are set. In order to suppress the rise of the turbine RPM (Nt) by outputting a control signal and to allow the kickdown band to reach the operating state quickly, the kickdown band is operated and the kickdown switch is stored in the memory when the kickdown switch is turned off at the time. Set the initial duty D2 in the 3rd speed to 2nd speed map, set the duty slope and the duty output time to α% / Sec to output the corresponding duty control signal, and if the gear stage is synchronized to the 2nd gear, By terminating the output of all duty control, the shift shock that occurs during the shifting of the three-speed downshift from the power-on kickdown three-speed is reduced to improve the feeling of shifting and riding It is possible to provide a kick-down 3-speed 2-speed power off-down shift control method with an effect of improving the feeling.

Claims (3)

A 2 speed shift control is performed at the 3 speed of the power-on kickdown while the vehicle is running, the method comprising: determining whether the power is on; When the state of the power is changed to off rather than on, the initial duty D1 stored in the second speed control map at the kickdown third speed of the memory is set, and the duty output signal is set by setting the duty output time and the duty gradient. Outputting; Determining whether the kick-down switch is turned off by outputting the duty control signal; If the kickdown switch is turned off, smoothly controlling the kickdown band by outputting a corresponding duty control signal at a duty initial value D2, a duty gradient, and a duty output time α% / Sec stored in a memory; Judging whether the kick-down band is smoothly controlled and whether the shift stage has made a 2-speed synchronization determination; And a step of terminating the control of the duty D2 outputted from the output stage when the shift stage determines the second speed synchronization. The method of claim 1, wherein the method for determining the shift stage second speed synchronous determination is calculated by calculating a value (No) of the output shaft rotation speed with the second gear ratio, and calculating the value, and calculating the value of the rotation speed of the turbine ( Nt) and calculated, and if the calculated value is less than or equal to the rotation speed value (Ntb2) of the target turbine, the second speed power-down downshift at the kickdown third speed comprising the completion of the shift stage second speed synchronization determination Shift control method. {No × 2 Gear Ratio-Nt ≤ Ntb2 (No is the output shaft speed, Nt is the speed of the turbine, Ntb2 is the speed of the target turbine.)} 2. The method of claim 1, further comprising: performing a second speed control routine at the third speed of the feedback when the power state is on. 3.