KR100254212B1 - Power on up shift control method - Google Patents

Abstract

PURPOSE: A control method for the power on up-shift of an automatic transmission is provided to prevent shift shock at the first stage of the power on up-shift by controlling the hydraulic pressure of a release member with duty for properly controlling the torque capacity of the release member. CONSTITUTION: A control system for the power on-up shift of an automatic transmission contains a traveling state sensor(10) outputting electric signals depending on the traveling state of a vehicle; and a controller(20) controlling the hydraulic pressure of a release member with duty for properly controlling the capacity of a release member by operating the torque of the release member according to the increase of an apply member torque. The traveling state sensor consists of a throttle valve opening degree sensor(11) outputting a signal about the opening degree of a throttle valve interlocking with the state of an accelerator pedal; a velocity sensor(12) outputting a signal about vehicle velocity; a gear lever sensor(13) outputting a signal when a gear lever is changed with the opening degree of the throttle and the velocity; an engine rpm(revolutions per minute) sensor(14) outputting a signal about the rotating speed of a crankshaft; and a turbine shaft rpm sensor(15) outputting a signal about the rotating speed of a turbine shaft in a torque converter connected to the input shaft of the automatic transmission.

Description

How to control power-on shift shifting of automatic transmission

The present invention relates to a method for controlling power-on-shift shifting of an automatic transmission. More particularly, when a power-on-shift shift occurs during driving in a vehicle equipped with an automatic transmission, the increase in the application member torque is increased by a set arithmetic formula. Accordingly, the present invention relates to a power-on-shift shift control method of an automatic transmission for preventing shift shock caused by calculating torque of a release member to duty-control hydraulic pressure of the release member.

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 is not generated due to a malfunction of the driver or an immature driving during 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 driven gear geared to the drive gear, thereby controlling the rotational movement 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.

When a power-on-up shift shift occurs while driving in a vehicle equipped with the automatic transmission operating as described above, it is conventionally using a method of using a hardware one-way clutch and a method of using a hydraulic servo device or using Bang Bang in software. The control method was used.

However, the above-described conventional technology has a problem in that there is no change in RPM of the turbine in the initial stage of the power-on shift, and only a change in torque occurs, thereby causing a shift shock during shifting.

That is, in the above section, if the torque capacity TCr of the release member is smaller than the torque of the release member, run-up shock occurs during shifting, and the torque capacity TCr of the release member is too larger than the torque Tr of the release member. If there is a problem in that the shift to the Inertia Phase (shift time) does not occur at the appropriate time.

Therefore, in order to solve the above-mentioned conventional problems, the hydraulic pressure of the release member is calculated to appropriately control the release member torque capacity TCr by calculating the torque Tr of the release member according to the increase of the application member torque Ta. The duty control of Pr) provides a power on up shift shift control method of an automatic transmission having an effect of preventing a shift shock occurring at the beginning of the shift during power on up shift.

The present invention for achieving the above object,

A first step of calculating a torque (Tr) of the release member for a predetermined set time when the vehicle starts to drive and a power-on up shift shift occurs;

A second step of calculating the torque Tr1 of the release member before shifting and the application member torque Ta2 after shifting, respectively, by the arithmetic expression of said first step;

A third step of calculating the torque Tr of the release member by recalculating the torque Tr1 of the release member before shifting and the application member torque Ta2 after the shifting using the calculated values in the second step;

A fourth step of calculating the torque Ta of the application member by the magnitude of the hydraulic pressure currently applied to the application member;

The torque Tr of the release member is calculated by recalculating the torque Ta of the application member calculated in the fourth step, so that the torque capacity TCr of the release member is not smaller than the release member torque Tr. And a fifth step of duty-controlling the hydraulic pressure Pr of the release member.

1 is a power-on-shift shift control pattern diagram of an automatic transmission according to an embodiment of the present invention;

2 is a graph showing the relationship between the duty and the hydraulic pressure in the power-on-up shift shift control of the automatic transmission according to the embodiment of the present invention;

3 is a block diagram of a power-on-up shift control apparatus of an automatic transmission 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.

A vehicle driving state sensing means 10 which receives a signal that is varied in the state of the vehicle and outputs a corresponding electric signal according to a driving state of the vehicle;

The control signal of the release member torque capacity TCr is appropriately controlled by receiving and reading the signal output from the vehicle driving state detecting means 10 to calculate the torque Tr of the release member according to the increase of the application member torque Ta. Control means 20 for performing hydraulic pressure (Pr) duty control of the release member.

In the above, the vehicle operation state detection means 10,

A throttle valve opening degree detection unit 11 for detecting an opening degree of a throttle valve whose opening and closing state is variable in association with an operation state of the accelerator pedal and outputting 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;

Turbine shaft rotation speed sensing unit 15 for detecting the rotational speed of the turbine shaft of the torque converter connected to the input shaft of the transmission and outputs a corresponding signal.

When the vehicle starts running and a power-on up shift shift occurs, the control means 20 calculates the release member torque Tr at t, which is an arbitrary set time, as shown in FIG.

이므로

Because of

가 된다.

Becomes

이다.therefore

to be.

therefore

Become

To sum up the above formula,

가 된다.

Becomes

(Tr1 is the torque before shifting of the release member,

TCr1 is the torque capacity before shifting of the release member,

Tr is the shifting torque of the release member,

Tr2 is the post-shift torque of the release member,

Ta1 is the torque before shifting of the application member (same as torque capacity TCa1),

Ta is the torque during shifting of the application member,

Ta2 torque after shifting of the application member

to be.)

At this time, the torque Tr1 of the release member before the shift and the application member torque Ta2 after the shift are as follows.

이고,

ego,

이다.

to be.

Where Te is the torque of the engine,

i1 is the 1st gear ratio (pre-shift gear ratio),

I2 is the 2nd gear ratio (gear ratio after shifting)

to be.)

In the above, the engine torque Te is inputted from the preset power data to the control means 20.

As described above, the torque Tr1 of the release member before the shift and the application member torque Ta2 after the shift are respectively calculated, so that the torque Tr of the release member is:

이므로

Because of

이다.

to be.

In the above, the torque Ta of the applicator member is determined by the magnitude of the hydraulic pressure currently applied to the applicator member.

Therefore, to calculate the torque Ta of the application member,

F_SPRING

F _SPRING

do.

Where μ is the coefficient of friction,

A is the cross section of the hydraulic piston,

F _SPRING is the working load of the return spring,

Re is the effective radius of the friction disk,

η is the friction surface number

to be.)

All values except the hydraulic pressure Pa of the applicator are constants, and the hydraulic pressure Pa of the applicator member is a value determined by a duty value output from the control means 20, and thus is shown in FIG. As can be seen, the relationship between duty and hydraulic pressure is determined by a graph transformation or equation.

As a result, the torque Tr of the release member is

F_SPRING)

F _SPRING )

In the above description, the engine torque Te and the oil pressure Pa of the application member are values that the control means 20 can calculate, and all others are constant.

Therefore, when the torque Tr of the release member is calculated as described above, the control means 20 duty-controls the oil pressure Pr of the release member so that the torque capacity TCr of the release member does not become smaller than the release member torque Tr. .

In the above, the release member torque capacity TCr is

F_SPRING

F _SPRING

to be.

는 릴리즈 멤버의 마찰 계수이고,(From here

Is the coefficient of friction of the release member,

는 릴리즈 멤버의 피스톤 단면적이고,

Is the piston cross section of the release member,

F _SPRING is the return spring working load of the release member,

는 릴리즈 멤버의 마찰 디스크 유효반경이고,

Is the effective radius of the friction disk of the release member,

는 릴리즈 멤버의 마찰면수

Is the friction surface of the release member

to be.)

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, the hydraulic pressure Pr of the release member is calculated to appropriately control the release member torque capacity TCr by calculating the torque Tr of the release member according to the increase of the application member torque Ta. By controlling the duty, it is possible to provide a power on up shift shift control method of an automatic transmission having an effect of preventing a shift shock occurring at the beginning of the shift during power on up shift.

Claims (7)

A first step of calculating a torque (Tr) of the release member for a predetermined set time when the vehicle starts to drive and a power-on up shift shift occurs; A second step of calculating the torque Tr1 of the release member before shifting and the application member torque Ta2 after shifting, respectively, by the arithmetic expression of said first step; A third step of calculating the torque Tr of the release member by recalculating the torque Tr1 of the release member before shifting and the application member torque Ta2 after the shifting using the calculated values in the second step; A fourth step of calculating the torque Ta of the application member by the magnitude of the hydraulic pressure currently applied to the application member; The torque Tr of the release member is calculated by recalculating the torque Ta of the application member calculated in the fourth step, so that the torque capacity TCr of the release member is not smaller than the release member torque Tr. And a fifth step of duty-controlling the hydraulic pressure (Pr) of the release member. The method of claim 1, wherein the torque Tr of the release member is calculated for an arbitrary setting time.

Because of

Become therefore

to be. therefore

Become To sum up the above formula,

(Tr1 is the torque before shifting of the release member, TCr1 is the torque capacity before shifting of the release member, Tr is the shifting torque of the release member, Tr2 is the post-shift torque of the release member, Ta1 is the torque before shifting of the application member (same as torque capacity TCa1), Ta is the torque during shifting of the application member, Ta2 torque after shifting of the application member to be.) Power-up shift shift control method of an automatic transmission comprising the step of calculating to. The method of claim 1, wherein the torque Tr1 of the release member before the shift and the application member torque Ta2 after the shift are calculated.

ego,

Where Te is the torque of the engine, i1 is the 1st gear ratio (pre-shift gear ratio), I2 is the 2nd gear ratio (gear ratio after shifting) to be.) Power-up shift shift control method of an automatic transmission comprising the step of calculating to. The method of claim 3, wherein the method of calculating the release member torque Tr is

Because of

Power-up shift shift control method of an automatic transmission comprising the step of calculating to. The method according to claim 1, wherein the method for calculating the torque Ta of the application member according to the magnitude of the hydraulic pressure currently applied to the application member,

F _SPRING

do. Where μ is the coefficient of friction, A is the cross section of the hydraulic piston, F _SPRING is the working load of the return spring, Re is the effective radius of the friction disk, η is the friction surface number to be.) Power-up shift shift control method of an automatic transmission comprising the step of calculating to. The method of claim 5, wherein the method of calculating the torque Tr of the release member is

F _SPRING )

(In this case, the engine torque Te and the hydraulic pressure Pa of the application member are calculable values, and all others are constant.) Power-up shift shift control method of an automatic transmission comprising the step of calculating to. The method of claim 1, wherein the method of calculating the release member torque capacity TCr is

F _SPRING

(From here

Is the coefficient of friction of the release member,

Is the piston cross section of the release member, F _SPRING is the return spring working load of the release member,

Is the effective radius of the friction disk of the release member,

Is the friction surface number of the release member.) Power-up shift shift control method of an automatic transmission comprising the step of calculating to.

Images