KR101919964B1 - Neutral control apparatus of automatic transmission and method thereof - Google Patents

Abstract

Disclosed is a neutral control apparatus and method for an automatic transmission. The neutral control apparatus for an automatic transmission according to the present invention includes a shift lever position sensing unit for sensing a position of a shift lever; A vehicle speed sensing unit for sensing a speed of the vehicle; A speed change stage sensing unit for sensing a speed change state; A clutch driving unit for driving the under drive clutch to supply or release the hydraulic pressure; The vehicle speed and the shift state of the shift lever from the shift lever position sensing unit, the vehicle speed sensing unit, and the gear position sensing unit, and calculates the average acceleration in the immediately preceding setting interval of the vehicle. And a shift control portion for controlling the clutch driving portion by compensating the hydraulic pressure compensation value according to the average acceleration to the setting release hydraulic pressure.

Description

TECHNICAL FIELD [0001] The present invention relates to a neutral control apparatus for an automatic transmission,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a neutral control apparatus and method for an automatic transmission, and more particularly, to a neutral control apparatus and method for an automatic transmission that can improve a transmission feel by adjusting a release hydraulic pressure of an underdrive clutch To a neutral control device of an automatic transmission and a method thereof.

Generally, a vehicular automatic transmission is a transmission having a function of automatically changing a transmission ratio according to a vehicle speed or an engine speed.

The automatic transmission includes a torque converter that automatically converts the torque by the kinetic energy of the fluid, a friction mechanism that is operated by the hydraulic pressure in response to the shift of the shift lever and transmits the driving force of the input shaft to the planetary gear set, A planetary gear set that is driven by a friction mechanism to adjust the speed ratio according to the running speed and load of the vehicle, and an actuator that drives the friction mechanism by hydraulic pressure.

In this automatic transmission, when the driver converts the shift lever to a desired speed change stage, the hydraulic pressure supplied from the oil pump of the hydraulic control circuit is selectively operated in accordance with the duty control of the solenoid valve by performing port conversion of the manual valve So that the shift is performed.

On the other hand, when the vehicle equipped with such an automatic transmission is stopped for a short period of time such as during signal waiting, most drivers stop the vehicle only by stepping on the brake pedal, and do not convert the shift lever to the N-step. That is, when the vehicle is stopped for a short period of time, such as during signal waiting, neutral control is performed to control the state of the vehicle in a manner similar to the state of the N-stage without the necessity of converting the shift lever to the N-stage.

This neutral control of the automatic transmission causes a slip between the number of rotations of the torque converter and the engine due to the underdrive clutch when the stop state of the shift lever is D for a certain period of time So that the load on the engine can be reduced by making it similar to the state of the stop N-stage. Here, the underdrive clutch is configured to transmit or release the driving force of the input shaft to the underdrive sun gear side of the planetary gear set.

In this neutral control, the engagement and disengagement operations of the underdrive clutch are alternately performed by the underdrive solenoid valve. Here, the plunger moves according to the value of the current applied to the underdrive solenoid valve to perform the engagement operation or the release operation of the underdrive, thereby determining the slip amount of the turbine.

Due to the alternate release operation and engagement operation of the underdrive clutch, the planetary gear set starts rotating, and feedback control for the underdrive solenoid valve is continuously performed to maintain the slip rpm of the neutral control .

Related prior arts are Korean Patent Laid-Open Publication No. 2016-0049834 (Aug. 20, 2016) entitled " Neutral control device for a vehicular automatic transmission and its neutral control method ".

When the neutral control is performed in this manner, the hydraulic pressure of the underdrive clutch is controlled to be released through the underdrive solenoid valve to neutral.

In this case, when the clutch is released quickly due to the low release oil pressure, a neutral control shock is generated. If the release hydraulic pressure is too high, the clutch is released, the power is transmitted even after the neutral shift is performed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a shift control device for an automatic transmission, And to provide a neutral control device for the automatic transmission and a method thereof.

According to an aspect of the present invention, there is provided a neutral control apparatus for an automatic transmission, comprising: a shift lever position sensing unit for sensing a position of a shift lever; A vehicle speed sensing unit for sensing a speed of the vehicle; A speed change stage sensing unit for sensing a speed change state; A clutch driving unit for driving the under drive clutch to supply or release the hydraulic pressure; The vehicle speed and the shift state of the shift lever from the shift lever position sensing unit, the vehicle speed sensing unit, and the gear position sensing unit, and calculates the average acceleration in the immediately preceding setting interval of the vehicle. And a shift control portion for controlling the clutch driving portion by compensating the hydraulic pressure compensation value according to the average acceleration to the setting release hydraulic pressure.

In the present invention, the immediately preceding setting section is a section that is decelerated at the D-stage position of the shift lever so that the speed change stage is shifted from the second stage to the first stage and then stopped.

The present invention is characterized in that the shift control section judges the state of fluctuation of the acceleration in the immediately preceding setting interval and compares the average acceleration with the rapid stop reference acceleration to determine the sudden stop state.

In the present invention, the shift control section determines the state of change of the acceleration and controls the clutch drive section with the set release hydraulic pressure when there is an increased section.

In the present invention, the shift control portion controls the clutch driving portion with the set release hydraulic pressure when the average acceleration is equal to or greater than the sudden stop reference acceleration.

According to another aspect of the present invention, there is provided a neutral control method for an automatic transmission, the method including: receiving a position of a shift lever, a vehicle speed and a shift state from a shift lever position sensing unit, a vehicle speed sensing unit, Determining a vehicle speed by the shift control unit and calculating an average acceleration in a set interval immediately before the vehicle is stopped; And controlling the clutch driving unit by compensating the hydraulic pressure compensation value according to the average acceleration to the set hydraulic pressure release pressure of the underdrive clutch according to the sudden stop state of the transmission control unit.

In the present invention, the immediately preceding setting section is a section that is decelerated at the D-stage position of the shift lever so that the speed change stage is shifted from the second stage to the first stage and then stopped.

The sudden stop state in the present invention is characterized in that the shift control section judges the fluctuation state of the acceleration in the set immediately preceding stopping section and compares the average acceleration with the rapid stop reference acceleration.

In the present invention, the step of controlling the clutch driving part includes the step of performing neutral control with the setting release hydraulic pressure when the shift control part determines the variation state of the acceleration and there is an increased section.

The step of controlling the clutch driving part in the present invention includes the step of comparing the average acceleration with the rapid acceleration reference acceleration and performing the neutral control with the set release hydraulic pressure when the average acceleration is equal to or greater than the rapid acceleration reference acceleration do.

An apparatus and method for neutralizing an automatic transmission according to an aspect of the present invention includes calculating an average acceleration in a set immediately preceding a stop when performing neutral control in an automatic transmission vehicle, The transmission feeling can be improved by compensating and adjusting according to the acceleration.

1 is a block diagram showing a neutral control apparatus for an automatic transmission according to an embodiment of the present invention.
2 is a flowchart illustrating a neutral control method for an automatic transmission according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and method for neutral control of an automatic transmission according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram showing a neutral control apparatus for an automatic transmission according to an embodiment of the present invention.

1, the neutral control apparatus for an automatic transmission according to an embodiment of the present invention includes a shift lever position sensing unit 10, a vehicle speed sensing unit 20, a speed change sensing unit 30, a clutch driving unit 50 and a speed change control unit 40. [

The shift lever position sensing unit 10 senses whether the shift lever (not shown) is located at P, R, N, or D and provides the shift lever position sensing unit 10 to the shift control unit 40.

The vehicle speed sensing unit 20 senses the speed of the vehicle and provides the vehicle speed to the shift control unit 40 so that the vehicle can be stopped.

The speed change stage sensing unit 30 senses the speed change state of the automatic transmission and provides it to the shift control unit 40.

The clutch driving portion 50 supplies or releases the hydraulic pressure so that the underdrive clutch 60 for neutral control is driven.

The transmission control unit 40 receives the position of the shift lever, the vehicle speed and the shift state from the shift lever position sensing unit 10, the vehicle speed sensing unit 20, and the gear position sensing unit 30, The average acceleration is calculated.

Here, the immediately preceding setting section may be a section from the D-stage position of the shift lever to the shift position after shifting from the second stage to the first stage and then stopping.

That is, in the present invention, the vehicle behavior state is determined by setting the immediately preceding setting interval as the interval during which the vehicle suddenly stops and performs the neutral control.

The transmission control section 40 determines the rapid stopping state based on the acceleration change and the average acceleration in the immediately preceding set stop interval and sets the hydraulic pressure compensation value according to the average acceleration to the set release hydraulic pressure of the underdrive clutch 60 So as to control the clutch driving unit 50.

If not in the sudden stop state, the shift control portion 40 controls the clutch driving portion 50 with the set release hydraulic pressure to perform the neutral control.

Here, the shift control unit 40 determines the state of variation of the acceleration in the immediately preceding setting interval, compares the average acceleration with the rapid acceleration reference acceleration, and determines the emergency stop state.

That is, the shift control unit 40 determines the variation state of the acceleration and, if there is an increased period, controls the clutch driving unit 50 with the setting release hydraulic pressure as a general neutral state to perform the neutral control.

Also, even when the average acceleration is equal to or greater than the sudden stop reference acceleration, the shift control unit 40 can perform the neutral control by controlling the clutch driving unit 50 with the set release hydraulic pressure as a general neutral state.

Here, the setting release hydraulic pressure of the underdrive clutch 60 for neutral control can be set based on the engine speed, the accelerator pedal value, and the like.

As described above, according to the neutral control apparatus for an automatic transmission according to the embodiment of the present invention, when the neutral control is performed in the automatic transmission vehicle, the average acceleration is calculated in the immediately preceding setting interval and the setting of the underdrive clutch It is possible to improve the shift feeling by compensating and adjusting the release hydraulic pressure according to the average acceleration.

2 is a flowchart illustrating a neutral control method for an automatic transmission according to an embodiment of the present invention.

2, in the neutral control method for an automatic transmission according to an embodiment of the present invention, the transmission control unit 40 includes a shift lever position sensing unit 10, a vehicle speed sensing unit 20, The position of the shift lever, the vehicle speed, and the shift state from the input shaft 30 (S10).

Then, the transmission control unit 40 determines whether the vehicle is stopped through the vehicle speed inputted from the vehicle speed sensing unit 20 in step S10 (S20).

If the vehicle is not stopped in step S20, the process returns to step S10 to continue monitoring the state of the vehicle and the automatic transmission. However, if the vehicle is stopped, the transmission control unit 40 calculates the average acceleration in the immediately preceding set interval S30).

Here, the immediately preceding setting section can be set to a section from the D-stage position of the shift lever to the section from the second-speed stage to the first-speed stage and then to the stop position.

The transmission control unit 40 can perform the neutral control by determining the behavior state in the immediately preceding setting interval and distinguishing the neutral control in the stop state from the neutral control after selecting the D stage in the stopped state.

Accordingly, the shift control unit 40 determines whether there is an acceleration increase period in the set immediately preceding stop setting interval (S40).

If it is determined in step S40 that there is an increase period of the acceleration, the transmission control unit 40 determines that the transmission is in the normal neutral control mode and controls the clutch driving unit 50 to perform the neutral transmission in step S70 ).

On the other hand, if it is determined in step S40 that there is an increasing period of the acceleration, the shift control unit 40 compares the average acceleration with the steep stop reference acceleration to determine the steep stop state (S50).

In step S50, if the average acceleration is compared with the steep stop reference acceleration and the average acceleration is equal to or greater than the steep stop reference acceleration, the shift control unit 40 determines that the normal neutral control is performed and controls the clutch driving unit 50 with the set release hydraulic pressure, (S70).

On the other hand, when the average acceleration is compared with the sudden stop reference acceleration in step S50 and the average acceleration is smaller than the sudden stop reference acceleration, the transmission control unit 40 compensates the hydraulic pressure compensation value according to the average acceleration to the set release hydraulic pressure of the underdrive clutch 60 And controls the clutch driving unit 50 to perform the neutral shift (S70).

Here, the setting release hydraulic pressure of the underdrive clutch 60 for neutral control can be set based on the engine speed, the accelerator pedal value, and the like.

As described above, according to the neutral control method for the automatic transmission according to the embodiment of the present invention, when the neutral control is performed in the automatic transmission vehicle, the average acceleration is calculated in the immediately preceding setting interval and the setting of the underdrive clutch It is possible to improve the shift feeling by compensating and adjusting the release hydraulic pressure according to the average acceleration.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of the present invention should be determined by the following claims.

10: shift lever position sensing unit 20: vehicle speed sensing unit
30: speed change detecting section 40: speed change control section
50: clutch driving part 60: under drive clutch

Claims (10)

A shift lever position sensing unit for sensing the position of the shift lever;
A vehicle speed sensing unit for sensing a speed of the vehicle;
A speed change stage sensing unit for sensing a speed change state;
A clutch driving unit for driving the under drive clutch to supply or release the hydraulic pressure; And
The vehicle speed, and the shift state from the shift lever position sensing unit, the vehicle speed sensing unit, and the speed change stage sensing unit, calculates the average acceleration in the immediately preceding setting interval of the vehicle, And a shift control unit for controlling the clutch driving unit by compensating an oil pressure compensation value corresponding to the average acceleration to a set release oil pressure of the underdrive clutch,
Wherein the immediately preceding setting section is a section from deceleration at the D-stage position of the shift lever until the speed change stage is shifted from the second stage to the first stage and then stopped,
Wherein the shift control unit determines a variation state of the acceleration in the immediately preceding setting interval and compares the average acceleration with the rapid acceleration reference acceleration to determine a sudden stop state,
Determines the variation state of the acceleration, and controls the clutch driving unit with the set release hydraulic pressure if there is an increased interval,
And controls the clutch driving unit with the set release hydraulic pressure when the average acceleration is equal to or greater than the rapid acceleration reference acceleration.
delete delete delete delete Receiving a position of a shift lever, a vehicle speed and a shift state from a shift lever position sensing unit, a vehicle speed sensing unit, and a gear position sensing unit, respectively;
Determining the vehicle speed by the shift control unit and calculating an average acceleration in a set interval immediately before the vehicle is stopped; And
And controlling the clutch driving unit by compensating the hydraulic pressure compensation value corresponding to the average acceleration to the set hydraulic pressure release pressure of the underdrive clutch according to the sudden stop state of the transmission control unit,
Wherein the immediately preceding setting section is a section from deceleration at the D-stage position of the shift lever until the speed change stage is shifted from the second stage to the first stage and then stopped,
The sudden stop state may be determined by the shift control unit determining the change state of the acceleration in the immediately preceding stop setting interval, comparing the average acceleration with the stopping reference acceleration,
Wherein the step of controlling the clutch driving unit includes the steps of: performing neutral control with the set release hydraulic pressure when the shift control unit determines the variation state of the acceleration and there is an increased interval; And
And performing a neutral control with the set release hydraulic pressure when the average acceleration is equal to or greater than the stop reference reference acceleration by comparing the average acceleration with the stop reference reference acceleration, Control method.
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