KR20130002575A

KR20130002575A - Method for controlling hydranlic pressure and for learning initial fill-time in automatic transmission

Info

Publication number: KR20130002575A
Application number: KR1020110063607A
Authority: KR
Inventors: 최승만
Original assignee: 주식회사 현대케피코
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2013-01-08

Abstract

The present invention relates to a hydraulic control method and an initial fill time learning control method of an automatic transmission, and more particularly, a hydraulic control method for preventing excessive fill-duty of an early shift solenoid of an automatic transmission is disclosed.
Hydraulic control method of the automatic transmission according to an aspect of the present invention, the step of calculating the peel hydraulic pressure correction coefficient according to the solenoid output duty, And correcting the peel oil pressure by applying the calculated peel oil pressure correction coefficient.
The calculating of the peel hydraulic pressure correction coefficient may include calculating a hydraulic pressure release time correction coefficient according to the solenoid output duty, calculating a hydraulic pressure release time according to the hydraulic pressure release time correction coefficient, and the fill according to the hydraulic pressure release time. By calculating the hydraulic pressure correction coefficient, it can be performed. Also, unless the fill hydraulic pressure is applied, The method may further include controlling fill time learning.

Description

Method for controlling hydranlic pressure and for learning initial fill-time in automatic transmission

The present invention relates to a hydraulic control method of an automatic transmission, and more particularly, to a hydraulic control method and an initial fill time learning control method of an automatic transmission capable of preventing excessive fill oil pressure from being provided during an automatic transmission shift.

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. 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, 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 recent years, as the speed of the automatic transmission increases, the speed of the automatic transmission increases, and thus, the control member is repeatedly engaged / disengaged within a short time. In this case, since the fill hydraulic pressure of the coupling element is overlapped in a short time, for example, during the power-up upshift, if the application-side hydraulic pressure is supplied rapidly before the release-side hydraulic pressure is released, the moment during the power-up upshift As a result, an interlock occurred inside the automatic transmission, which causes a driver to feel a shift shock.

Accordingly, the technical problem to be achieved by the present invention is to introduce the hydraulic release time correction factor and the peel hydraulic pressure correction coefficient in order to prevent excessive peeling pressure generation, and when the continuous shift occurs, excessive peeling pressure is generated using the correction coefficient. An object of the present invention is to provide a hydraulic control method and an initial fill time learning control method of an automatic transmission that can be prevented.

The object of the present invention is not limited to the above-mentioned object, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

Hydraulic control method of the automatic transmission according to an aspect of the present invention for achieving the above object, as a hydraulic control method for preventing excessive fill-duty of the early shift solenoid of the automatic transmission,

Calculating the fill hydraulic pressure correction coefficient according to the solenoid output duty, and And correcting the peel oil pressure by applying the calculated peel oil pressure correction coefficient.

The calculating of the peel hydraulic pressure correction coefficient may include calculating a hydraulic pressure release time correction coefficient according to the solenoid output duty, calculating a hydraulic pressure release time according to the hydraulic pressure release time correction coefficient, and the fill according to the hydraulic pressure release time. By calculating the hydraulic pressure correction coefficient, it can be performed.

Also, unless the fill hydraulic pressure is applied, The method may further include controlling fill time learning.

Here, the control of the fill time learning may include determining whether the elapsed time after the start of the fill interval is less than the first reference value and whether the absolute value of the turbine acceleration exceeds the second reference value. And reducing the fill time by a first preset time when the elapsed time is less than a first reference value and the absolute value of the turbine acceleration exceeds the second reference value.

The decreasing the fill time may include reducing the fill time by a first preset time when the fill excess counter exceeds a preset threshold as a result of increasing the fill excess counter.

The method may further include increasing the fill time when the elapsed time after the start of the fill section is greater than or equal to a first reference value and the absolute value of the turbine acceleration is less than or equal to the second reference value. The step of increasing the time may include determining whether the shift preparation time exceeds a third reference value and whether there is a variation in the learning value on the coupling solenoid side, and as a result of the determination, the shift preparation time is a third reference value. And exceeding, and if the learning value change amount is present, increasing the fill deficiency counter.

The increasing of the fill time may include increasing the fill time by a preset second setting time when the peeling short counter exceeds a preset fourth reference value as a result of increasing the peeling short counter. do.

Specific details of other embodiments are included in the detailed description and the drawings.

As described above, according to the present invention, even if frequent shifting is performed in the multi-stage transmission, it is possible to prevent excessive fill hydraulic pressure by controlling the size of the fill hydraulic pressure. Durability is increased.

1 is a flowchart illustrating a hydraulic control method of an automatic transmission in an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a time series processing sequence of step S110 of FIG. 1;
3 is a flowchart illustrating a time series processing sequence of step S140 of FIG. 1,
FIG. 4 is a flowchart illustrating a time series processing sequence of step S150 of FIG. 3.

Advantages and features of the present invention, and methods of achieving the same will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Hereinafter, a hydraulic control method of an automatic transmission according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 is a flowchart illustrating a hydraulic control method of an automatic transmission according to an exemplary embodiment of the present invention, FIG. 2 is a flowchart illustrating a time series processing procedure of step S110 of FIG. 1, and FIG. 3 is a time series of step S140 of FIG. 1. 4 is a flowchart illustrating a typical processing sequence, and FIG. 4 is a flowchart illustrating a time series processing sequence of step S150 of FIG. 3.

The hydraulic control method according to an embodiment of the present invention is a hydraulic control method for preventing the fill-duty of the early shift solenoid of the automatic transmission, and when it is determined that excessive fill hydraulic pressure is applied to the initial shift, By applying a correction factor, the fill hydraulic pressure can be corrected. Otherwise, the fill time learning control can be used to derive the optimum hydraulic learning value. Through this, proper transmission control is achieved by controlling the size of the fill hydraulic pressure, so that the shifting feeling is improved and the durability of the transmission can be increased.

As such, the hydraulic control method, as shown in Figure 1, the step of calculating the peel hydraulic pressure correction coefficient according to the solenoid output duty (S110), determining the section to which the peel hydraulic pressure is applied (S120), Compensating the fill hydraulic pressure (S130) according to the determination result, and performing a fill time learning control (S140).

Specifically, the calculation of the fill hydraulic pressure correction coefficient according to the solenoid output duty, as shown in Figure 2, the step of calculating the hydraulic release time correction coefficient according to the solenoid output duty (S111), and according to the hydraulic release time correction coefficient Computing the hydraulic pressure release time (S113), and calculating the hydraulic pressure correction coefficient according to the hydraulic pressure release time (S115) can be performed.

In addition, according to the present embodiment, if it is determined in the step S120 to the fill hydraulic pressure applying section, The fill hydraulic pressure is corrected (S130), which is specifically by applying the peel hydraulic pressure correction coefficient calculated by the step S115 to the peeling pressure before the correction (for example, after the peeling pressure = the peeling pressure before the correction * the peeling pressure correction) Coefficients).

On the other hand, if it is determined that the peel hydraulic pressure is not applied, In the present embodiment, the fill time learning control (S140) is performed, and a detailed time series processing process thereof will be described below in detail with reference to FIG. 3.

Referring to FIG. 3, the controlling of the fill time learning (S140) may include determining whether the elapsed time after the start of the fill interval is less than the first reference value (S141) and the absolute value of the turbine acceleration is the second reference value. Determining whether or not exceeding (S143) and the step of reducing the fill time by a predetermined first set time or increasing the fill time by a second set time according to the determination result.

Specifically, as a result of the determination in steps S141 and S143, when the elapsed time after the start of the fill section is less than the first reference value and the absolute value of the turbine acceleration exceeds the second reference value, the overfill counter is increased at the same time. When the fill undercount counter is reset (S145), and it is determined whether the increased fill excess counter exceeds a preset third reference value (S147). As a result of the determination, the fill time counter exceeds the third reference value. In step S149, learning control is performed to decrease by the first set time.

If it is determined in steps S141 and S143 that the elapsed time after the start of the fill section is greater than or equal to the first reference value and the absolute value of the turbine acceleration is less than or equal to the second reference value, learning control for increasing the fill time may be performed. This is described (S150) will be described in detail with reference to FIG.

As shown in FIG. 4, the learning control for increasing the fill time determines whether the shift preparation time exceeds the fourth reference value (S151), and determines whether there is an amount of change in the learning value on the coupling solenoid side. As a result of the determination, if the shift preparation time exceeds the fourth reference value and the learning value change amount is present, a processor for increasing the peel short counter is performed (S155).

At this time, if the shift preparation time does not exceed the fourth reference value or the learning value change amount does not exist, the peel short counter is reset (S156).

In operation S155, it is determined whether the increased fill shortage counter exceeds a preset fifth reference value (S157), and when the determination result indicates that the fill shortened counter exceeds the fifth reference value, the preset second setting is determined. The fill time is increased by the time (S159).

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

The above described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the claims and their equivalents should be construed as being included in the scope of the present invention.

Claims

Hydraulic control method to prevent the fill-duty of the early shifting solenoid of automatic transmission,
Calculating a fill hydraulic pressure correction factor according to the solenoid output duty;
Determining that it is a peel hydraulic pressure application section; And
As a result of determination, if it is a peel oil pressure application section, Correcting the peel oil pressure by applying the calculated peel oil pressure correction factor.
Hydraulic control method of the automatic transmission comprising a.

The method of claim 1, wherein the calculating of the peel hydraulic pressure correction factor comprises:
Calculating a hydraulic release time correction coefficient according to the solenoid output duty;
Calculating a hydraulic release time according to the hydraulic release time correction coefficient; And
Calculating the peel hydraulic pressure correction coefficient according to the hydraulic pressure release time.
Control method of automatic transmission.

The method of claim 3,
If the result of the determination, if not the fill hydraulic pressure applying interval, further comprising the step of controlling the fill time learning;
Hydraulic control method of automatic transmission.

The method of claim 3, wherein the controlling of the fill time learning comprises:
Determining whether the elapsed time after the start of the fill interval is less than the first reference value and whether the absolute value of the turbine acceleration exceeds the second reference value; And
And determining that the fill time is decreased by a first preset time when the elapsed time after the start of the fill section is less than a first reference value and the absolute value of the turbine acceleration exceeds the second reference value.
Hydraulic control method of automatic transmission.

The method of claim 4, wherein reducing the fill time comprises:
And, if the elapsed time after the start of the fill interval is less than a first reference value and the absolute value of the turbine acceleration exceeds the second reference value, increasing the fill excess counter.
Reducing the fill time by the preset first preset time if the increased fill excess counter exceeds a preset third reference value;
Hydraulic control method of automatic transmission.

5. The method of claim 4,
Increasing the fill time when the elapsed time after the start of the fill section is greater than or equal to a first reference value and the absolute value of the turbine acceleration is less than or equal to the second reference value;
Hydraulic control method of the automatic transmission further comprising a.

The method of claim 6, wherein increasing the fill time comprises:
Determining whether the shift preparation time exceeds a fourth reference value and whether there is an amount of change in learning value on the coupling solenoid side;
And if the shift preparation time exceeds a fourth reference value and the learning value change amount is present, increasing the peel short counter.
Hydraulic control method of automatic transmission.

8. The method of claim 7, wherein increasing the fill time comprises:
Increasing the peel time by the preset second preset time when the peel short counter exceeds the preset fifth reference value as a result of increasing the peel short counter.
Hydraulic control method of automatic transmission.