KR101704997B1 - Method and Device for Controlling Hydraulic Pressure in Auto Transmission - Google Patents

Abstract

The present invention relates to a hydraulic control method for an automatic transmission and a control apparatus therefor, and more particularly, to a hydraulic control method for detecting an occurrence of an interlock in an automatic transmission, .
The hydraulic pressure control method and the control apparatus according to an embodiment of the present invention can improve the shifting feeling with precise and stable control of each friction element and eliminate the possibility that the friction element is operated by an unspecified wrong combination, Thereby providing an effect of improving durability of the automatic transmission such as prevention of burnout.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic control method for an automatic transmission,

The present invention relates to a hydraulic control method for an automatic transmission and a control apparatus therefor, and more particularly, to a hydraulic control method for detecting an occurrence of an interlock in an automatic transmission, .

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

BACKGROUND ART [0002] An automatic transmission mounted on a vehicle automatically changes the power from a power generator such as an engine to a torque and a rotation speed suitable for the running state of the vehicle, thereby enabling smooth running of the vehicle.

As the speed ratio that can be implemented internally by the automatic transmission is varied, the power from the power generating device can be changed to a more suitable state according to the running state of the vehicle, so that the fuel efficiency and power performance of the vehicle can be improved.

In order to realize the various gear ratios as described above, it is necessary to control a large number of friction elements, and each friction element must be precisely and stably controlled so as to form a good shift feeling without occurrence of a shift shock or the like.

In particular, it is required that these friction elements always operate in the proper and appropriate combination, for which the hydraulic combination of the solenoid valves supplying hydraulic pressure to the respective friction elements must be precisely accomplished.

On the other hand, due to a structural cause of the automatic transmission, there is a case where the hydraulic pressure combination of the solenoid valve is wrong during the running of the vehicle. In such a case, an interlock occurs,

These interlocks cause the vehicle's drive wheels to stop, causing the vehicle to become whellock, and when such a wheel lock occurs, the vehicle speed is rapidly reduced, which can be a serious risk to the vehicle occupant.

To solve this problem, it is necessary to develop control logic to detect interlock occurrence and cope with it.

Accordingly, an aspect of the present invention has been proposed in order to solve the above-mentioned problems, and an object of the present invention is to provide a hydraulic control method and control method capable of effectively detecting interlock occurrence in an automatic transmission, Device.

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

In order to achieve the above-mentioned object, one aspect of the present invention compares a combination of a solenoid valve combination applied with a hydraulic pressure of a transmission and a hydraulic pressure combination table of each solenoid valve for each predetermined shift range to determine whether or not the transmission is interlocked A first interlock judging unit for judging whether or not the first interlock judging unit

An interlock control unit for outputting a control signal to release a solenoid valve that does not correspond to the hydraulic pressure applied combination table among the solenoid valve combinations when an interlock is determined from the first interlock determination unit; And

A valve release part for receiving the control signal from the interlock control part and releasing the solenoid valve;
In the case where the damper clutch is in the direct mode, and the interlock is not determined from the first interlock determination section, the interlock state of the transmission is determined based on the difference value between the engine speed and the turbine speed or / And a second interlock judging unit for judging whether or not the inter-
Wherein the first interlock determination unit receives the information including the current speed change step information and the solenoid operation current information and confirms the combination of the hydraulic pressure applied solenoid valve of the transmission.

Here, the first interlock determination unit may determine whether or not the execution condition for starting the execution of the interlock determination is satisfied, and determine whether the interlock condition is satisfied if the execution condition is satisfied.

Here, the execution condition may be determined based on at least one of an ignition signal, an engine cranking signal, a transmission oil temperature signal, and a vehicle speed signal.

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And the second interlock determination section may determine whether or not the transmission is interlocked when the interlock is not determined from the first interlock determination section.

According to another aspect of the present invention, there is provided a hydraulic control apparatus for a hydraulic control apparatus, comprising: a comparison step of comparing a combination of a hydraulic pressure applied solenoid valve of a transmission and a hydraulic pressure combination table of each solenoid valve for each predetermined shift position;

A first interlock determining step of determining whether or not the transmission is interlocked based on a result of comparing the solenoid valve combination and the hydraulic pressure applied combination table;
And determining whether the damper clutch is in a direct-coupling mode when the interlock is not determined in the first interlock determination step, and when the damper clutch is in the direct-coupling mode, a difference value between the engine speed and the turbine speed or / A second interlock determining step of determining whether or not the transmission is interlocked based on the interlock;

An interlock corresponding step of outputting a control signal to release a solenoid valve not corresponding to the hydraulic pressure applied combination table among the solenoid valve combinations when the interlock is judged; And

And a valve release step of receiving the control signal and releasing the solenoid valve. In the first interlock determination step, the current speed change step information and the solenoid operation current information are received and the hydraulic pressure applied solenoid valve combination is checked The hydraulic pressure control method for an automatic transmission.

Here, before performing the comparison step, an execution condition determination step of determining whether an execution condition for starting the execution of the interlock determination is satisfied is performed, and if the execution condition is satisfied in the determination step, the comparison step is performed .

Here, the execution condition may be determined based on at least one of an ignition signal, an engine cranking signal, a transmission oil temperature signal, and a vehicle speed signal.

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After performing the second interlock determination step of determining whether the transmission is interlocked based on the difference value between the engine speed and the turbine speed or / and the rate of change of the difference value when the damper clutch is in direct mode, It is possible to carry out the locking step.

As described above, according to an embodiment of the present invention, there is provided a hydraulic pressure control method and a control apparatus capable of effectively detecting occurrence of an interlock in an automatic transmission and appropriately responding thereto.

Further, the hydraulic control method and the control apparatus according to an embodiment of the present invention can improve the shifting feeling by precise and stable control of each friction element, eliminate the possibility that the friction element is operated by an unspecified wrong combination, And the durability of the automatic transmission is improved.

In addition, the effects of the present invention have various effects such as excellent general versatility according to the embodiments, and such effects can be clearly confirmed in the description of the embodiments described later.

1 shows a hydraulic control apparatus for an automatic transmission according to an embodiment of the present invention.
Fig. 2 shows a hydraulic pressure application combination table of the solenoid valves for each gear stage of the hydraulic control apparatus of Fig. 1. Fig.
3 is a block diagram showing a hydraulic control method for an automatic transmission according to another embodiment of the present invention.
4 is a flowchart of the control logic showing the hydraulic control method for the automatic transmission of Fig.

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

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the constitution and operation of the present invention are only for explaining the embodiments of the present invention, and do not limit the scope of the present invention.

1 shows a hydraulic control apparatus for an automatic transmission according to an embodiment of the present invention.

The hydraulic control apparatus 100 for an automatic transmission according to an embodiment of the present invention compares a solenoid valve combination applied with a hydraulic pressure of a transmission and an oil pressure combination table of each solenoid valve for each predetermined shift position, A first interlock judgment unit 110 for judging whether or not the first interlock judgment unit 110 judges that the first interlock judgment unit 110 is judged to be abnormal;

An interlock control unit (130) for outputting a control signal for releasing a solenoid valve which is not included in the hydraulic pressure applied combination table among the solenoid valve combinations when the interlock is judged from the first interlock judgment unit (110); And

And a valve release unit 140 for receiving the control signal from the interlock control unit 130 and releasing the solenoid valve.

In the present invention, the hydraulic control apparatus 100 for an automatic transmission includes a plurality of friction elements, each of which is supplied with hydraulic pressure and is operated by a plurality of different predetermined speed steps to form respective speed change stages, And a plurality of solenoid valves for controlling the hydraulic pressure.

The friction element of the transmission may, by way of example, include a clutch and a brake.

The solenoid valve drives the solenoid valve so that the driving unit that drives each solenoid valve controls the corresponding hydraulic pressure when the hydraulic pressure is applied, and the solenoid valve combination with the hydraulic pressure controls the hydraulic pressure to form the corresponding speed change stage have.

Here, the hydraulic pressure applied solenoid valve combination may mean a combination of solenoid valves that actually supply the hydraulic pressure to the friction element so that the friction element can form the required gear range required from the driver when the vehicle is running.

Here, the hydraulic pressure application combination table of the solenoid valves for each shift stage may be predetermined, and may be a map value stored in an electronic control unit (ECU), a transmission control unit (TCU), or the like installed in the vehicle.

The first interlock determining unit 110 receives the current speed change step information, the solenoid operating current information, and the like as an input signal, and also receives the information about the normal state of each input signal, It is possible to compare the hydraulic pressure combination table of the solenoid valves for each of the predetermined shift speeds, and it is possible to determine whether or not the transmission is interlocked based on the comparison result.

In this embodiment, the interlock may mean that the combination of the actual hydraulic pressure applied solenoid valve combination and the preset hydraulic pressure combination table of each solenoid valve does not match.

For example, the first interlocking determination unit 110 may determine interlock when at least one of the solenoid valve combinations to which the actual hydraulic pressure is applied is a solenoid valve that does not correspond to the hydraulic pressure combination table.

Fig. 2 exemplarily shows a hydraulic pressure application combination table of solenoid valves for each shift range of the hydraulic control apparatus of Fig.

The meaning of the interlock will be described in detail with reference to FIG. In Fig. 2, the horizontal axis represents a solenoid valve to which a hydraulic element is applied so that a friction element forms the corresponding speed change stage, and the vertical axis represents a speed change stage, which represents a speed change stage of 8 gears.

For example, the hydraulic pressure is applied to the S1 solenoid valve and the S4 solenoid valve, which are the operating elements of the second speed change speed stage, so that the second speed change stage can be formed, and the S1 solenoid valve and the S5 solenoid valve, The third-speed gear stage can be formed.

In this example, two solenoid valves operate at each speed range. In other words, S1 and S4 solenoid valves operate at 2nd speed range and S1 and S5 solenoid valves operate at 3rd speed range. However, when the speed change gear is shifted from the second speed to the third speed or from the third speed to the second speed, the S4 solenoid valve and the S5 solenoid valve may operate simultaneously due to the structural reason of the transmission, etc. In this case, do.

This is also the case when the transmission is shifted from 7 to 8 or from 8 to 7.

That is, when the speed change gear is shifted from the second speed to the third speed, the S1 solenoid valve operates at the third speed speed, and the S4 solenoid valve and the S5 solenoid valve simultaneously operate.

During the normal operation of the hydraulic control system 100 for an automatic transmission, in order to prevent such friction elements from being operated in an improper combination that is not defined, the S4 solenoid valve must be stopped at the third speed gear stage so that control for eliminating the interlock need.

1, when the interlock is determined by the first interlock determination unit 110, the interlock control unit 130 releases the solenoid valve that is not included in the hydraulic pressure applied combination table among the solenoid valve combinations A control signal can be output.

In addition, the valve releasing part 140 may release the solenoid valve by receiving a control signal from the interlock control part 130. [

That is, in the above-described example, the interlock control unit 130 may output a control signal to release the S4 solenoid valve, and the valve release unit 140 may release the S4 solenoid valve.

Here, the valve release portion 140 may serve to remove the hydraulic pressure applied to the solenoid valve. The valve releasing portion 140 may be, for example, a power supply for supplying power to the solenoid valve or a driving portion for outputting a control signal to the solenoid valve. However, the present invention is not limited to this, and the solenoid valve may be released mechanically or electrically Any configuration is acceptable.

According to the embodiment, the first interlock determination unit 110 may determine whether or not the execution condition for starting the execution of the interlock determination is satisfied, and determine whether the interlock condition is satisfied if the execution condition is satisfied. Here, the fulfillment condition may be determined based on at least one of an ignition signal, an engine cranking signal, a transmission oil temperature signal, and a vehicle speed signal according to the embodiment.

That is, the execution condition may be the case where the ignition is turned on, the engine cranking is started, the transmission oil temperature is within the set range, and the vehicle speed is equal to or more than a predetermined value.

Meanwhile, the hydraulic control apparatus 100 for an automatic transmission according to an embodiment of the present invention may include a second interlock determination unit 120 that is separate from the first interlock determination unit 110. The second interlock determination unit 120 can determine whether the transmission is interlocked based on the slip value and / or the slip change rate value when the damper clutch installed in the fluid clutch of the vehicle is in the direct mode.

For example, the second interlock determining unit 120 receives the damper clutch engagement state information, the slip value, and the slip rate change value as input signals, receives the information about the normal state of each input signal, And when the slip change rate value is larger than the second set value, it can be judged as an interlock.

Here, the slip value may be a difference value between the engine speed of the vehicle and the turbine speed of the fluid clutch, and the slip change rate value may mean the rate of change of the difference value described above. The structure of the hydraulic clutch and the damper clutch is widely known, and thus the detailed description thereof will be omitted.

According to the embodiment, the second interlock determination unit 120 can determine whether or not the transmission is interlocked when the interlock determination is not made from the first interlock determination unit 110. [ That is, when the interlock is determined by the first interlock determination unit 110, the interlock control unit 130 outputs a control signal to release the solenoid valve that does not correspond to the hydraulic pressure applied combination table, When the interlock is not judged by the second interlock judging unit 120, the second interlock judging unit 120 can judge whether the transmission is interlocked or not, The lock control unit 130 can output a control signal to release the solenoid valve that does not correspond to the hydraulic pressure applied combination table.

According to the embodiment, the second interlock judgment unit 120 judges whether or not the execution condition for starting the execution of the interlock judgment is satisfied, and judges whether or not the interlock condition is satisfied when the execution condition is satisfied. Whether or not the performance condition is satisfied may be determined based on at least one of an ignition signal, an engine cranking signal, a transmission oil temperature signal, and a vehicle speed signal according to the embodiment. Here, the description of the execution condition is replaced with the description of the execution condition in the first interlock determination unit 110. [

3 is a block diagram showing a hydraulic control method for an automatic transmission according to another embodiment of the present invention.

Another embodiment of the present invention is a hydraulic control method for an automatic transmission. In the hydraulic control method according to the present embodiment, a comparison step (S220) of comparing a solenoid valve combination applied with a hydraulic pressure of the transmission and a hydraulic pressure combination table of each solenoid valve for each predetermined shift position;

A first interlock determining step (S230) of determining whether or not the transmission is interlocked based on a result of comparing the solenoid valve combination and the hydraulic pressure applied combination table;

An interlocking step (S240) of outputting a control signal to release a solenoid valve that does not correspond to the hydraulic pressure applied combination table among the solenoid valve combinations when the interlock is judged; And

And a valve release step (S250) of receiving the control signal to release the solenoid valve.

According to an embodiment of the present invention, an execution condition determination step (S210) for determining whether an execution condition for starting the execution of the interlock determination is satisfied is performed before the comparison step, and when the execution condition is satisfied at the determination step, Step S220 may be performed.

According to the embodiment, the performance condition may be determined based on at least one of an ignition signal, an engine cranking signal, a transmission oil temperature signal, and a vehicle speed signal.

On the other hand, according to the embodiment, when the interlock is not determined in the first interlock determination step (S230), a direct mode determination step of determining whether the damper clutch is in the direct mode,

After performing the second interlock determination step of determining whether the transmission is interlocked based on the difference value between the engine speed and the turbine speed or / and the rate of change of the difference value when the damper clutch is in direct mode, (S240) may be performed.

4 is a flowchart of the control logic showing the hydraulic control method for the automatic transmission of Fig.

When the control logic is started, first, a confirmation step (S310) is performed to confirm whether or not the condition for performing interlock determination is satisfied. Whether or not the execution condition is satisfied may be determined based on at least one of the ignition signal, the engine cranking signal, the transmission oil temperature signal, and the vehicle speed signal that are input according to the embodiment.

That is, the execution condition may be the case where the ignition is turned on, the engine cranking is started, the case where the transmission oil temperature is within the set range, and the vehicle speed is equal to or more than a predetermined value, .

When it is determined that the execution condition is not satisfied in the confirming step S310, the process returns to the start. If it is determined that the execution condition is satisfied, it is determined whether or not the combination of the solenoid valve hydraulic pressure application table and the actually- (S320). ≪ / RTI >

If it is determined in the first determination step (S320) that the combination of the application table and the combination is different from each other, the interlocking logic is operated to release the solenoid valve that does not correspond to the oil pressure applied combination table (S340).

On the other hand, when it is determined in the first determination step (S320) that the combination with the application table is not different from each other, it is determined whether or not the transmission is interlocked based on whether the damper clutch is in the direct coupling mode and the slip value and the slip change rate value of the damper clutch And a second determination step (S330). Here, the slip value and the slip rate change value may be a difference value between the engine speed and the turbine speed or a rate of change of the difference value, as in the above embodiment.

If the damper clutch is not in the direct coupling mode, the slip value is smaller than the first set value, and the slip rate value is smaller than the second set value in the second determination step (S330) (S350).

However, when the damper clutch is in the direct coupling mode and the slip value is larger than the first set value and the slip rate change value is larger than the second set value in the second determination step (S330), it is determined to be interlock and the interlock- And releases the solenoid valve not corresponding to the hydraulic pressure combination table (S340).

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

The embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Hydraulic control device for automatic transmission
110: first interlocking section
120: second interlocking section
130: Interlock control unit
140: valve releasing portion

Claims (9)

A first interlock judging unit for judging whether or not the transmission is interlocked by comparing a combination of a solenoid valve combination applied with a hydraulic pressure of the transmission and a hydraulic pressure combination table of each solenoid valve for each predetermined shift stage;
An interlock control unit for outputting a control signal to release a solenoid valve that does not correspond to the hydraulic pressure applied combination table among the solenoid valve combinations when an interlock is determined from the first interlock determination unit;
A valve release part for receiving the control signal from the interlock control part and releasing the solenoid valve;
In the case where the damper clutch is in the direct mode, and the interlock is not determined from the first interlock determination section, the interlock state of the transmission is determined based on the difference value between the engine speed and the turbine speed or / And a second interlock judging unit for judging whether or not the inter-
Wherein the first interlock determining unit receives the information including the current speed change step information and the solenoid operating current information, and confirms the solenoid valve combination applied with the hydraulic pressure of the transmission. The method according to claim 1,
Wherein the first interlock determining unit determines whether or not an execution condition for starting execution of the interlock determination is satisfied and determines whether or not the interlock is satisfied when the execution condition is satisfied. 3. The method of claim 2,
Wherein the performance condition is determined based on at least one of an ignition signal, an engine cranking signal, a transmission oil temperature signal, and a vehicle speed signal. delete delete A comparison step of comparing a combination of the hydraulic pressure applied solenoid valve combination of the transmission and a hydraulic pressure combination table of each solenoid valve for each of the predetermined shift stages;
A first interlock determining step of determining whether or not the transmission is interlocked based on a result of comparing the solenoid valve combination and the hydraulic pressure applied combination table;
And determining whether the damper clutch is in a direct-coupling mode when the interlock is not determined in the first interlock determination step, and when the damper clutch is in the direct-coupling mode, a difference value between the engine speed and the turbine speed or / A second interlock determining step of determining whether or not the transmission is interlocked based on the interlock;
An interlock corresponding step of outputting a control signal to release a solenoid valve not corresponding to the hydraulic pressure applied combination table among the solenoid valve combinations when the interlock is judged; And
And a valve releasing step of receiving the control signal to release the solenoid valve,
Wherein the first interlock determination step receives the current speed change step information and the solenoid operation current information to confirm the solenoid valve combination applied with the hydraulic pressure of the transmission. The method according to claim 6,
Performing an execution condition determining step of determining whether or not an execution condition for starting execution of the interlock determination is satisfied before the comparison step and performing the comparison step when the execution condition is satisfied in the determination step Wherein the hydraulic control method is applied to an automatic transmission. 8. The method of claim 7,
Wherein the execution condition is determined based on at least one of an ignition signal, an engine cranking signal, a transmission oil temperature signal, and a vehicle speed signal. delete

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