KR102579351B1 - Control method for clutch of vehicle and control system for the same - Google Patents

Abstract

The present invention relates to a method of controlling a clutch of a vehicle and a control system thereof, comprising: a learning condition determination step in which a control unit determines whether a learning condition for a touch point value of the clutch is satisfied; When the learning condition is met, a first measurement step in which the control unit measures a standard response time required to increase the actuator hydraulic pressure of the clutch by the standard hydraulic pressure from a first reference value higher than the touch point value; After the first measurement step, the control unit measures the comparison response time required to increase the hydraulic pressure of the actuator by the reference hydraulic pressure from a second reference value lower than the touch point value to more than the touch point value. 2nd measurement step; and a correction step of calculating a deviation value between the comparison response time and the reference response time, and correcting the touch point value according to the deviation value.

Description

Vehicle clutch control method and control system {CONTROL METHOD FOR CLUTCH OF VEHICLE AND CONTROL SYSTEM FOR THE SAME}

The present invention relates to a vehicle clutch control method and control system, and more specifically, to a control method and control system for learning the touch points of a clutch provided in a transmission.

The transmission of a vehicle may be provided with a clutch that controls power connection with a driving source that may be comprised of an engine, motor, etc. When the clutch is engaged, the power of the drive source can be transmitted to the wheel side through the transmission, and when the clutch is released, the power of the drive source cannot be transmitted to the wheel side and is blocked.

The clutch may be of various types, such as a torque converter that transmits power through fluid or a friction-type clutch that transmits power using friction. In addition, a dual-clutch type transmission is equipped with a plurality of clutches (preferably two) to control power transmission to the plurality of input shafts.

Meanwhile, friction-type clutches may be of various types, such as dry clutches or wet clutches. Such friction-type clutches generally transmit power through frictional force as the plate-shaped rotating body provided on the engine's crankshaft and the friction-type plate provided on the input shaft of the transmission are pressed against each other.

At this time, the stroke amount or hydraulic pressure of the actuator in a situation where the friction clutch begins to contact the rotating body of the crankshaft and the clutch begins to transmit torque is called a touch point, and accurately finding the touch point is the clutch. This becomes an important task in control.

The matters described as background technology above are only for the purpose of improving understanding of the background of the present invention, and should not be taken as acknowledgment that they correspond to prior art already known to those skilled in the art.

KR 10-2016-0035635 A1

The present invention provides a clutch control method and control system that enables stable and accurate control of the clutch by accurately and reliably identifying and correcting the touch point of the clutch, which can constantly change due to the influence of rotation speed and temperature. There is a purpose in .

A method of controlling a clutch of a vehicle according to the present invention to achieve the above object includes a learning condition determination step in which the control unit determines whether the learning condition for the touch point value of the clutch is satisfied; When the learning condition is met, a first measurement step in which the control unit measures a standard response time required to increase the actuator hydraulic pressure of the clutch by the standard hydraulic pressure from a first reference value higher than the touch point value; After the first measurement step, the control unit measures the comparison response time required to increase the hydraulic pressure of the actuator by the reference hydraulic pressure from a second reference value lower than the touch point value to more than the touch point value. 2nd measurement step; and a correction step of calculating a deviation value between the comparison response time and the reference response time, and correcting the touch point value according to the deviation value.

The clutch may be any one of a plurality of wet clutches provided in the transmission.

The control unit may determine that the learning condition is satisfied when the transmission is in a neutral state, the gear stage of the input shaft on which the clutch is mounted is released, and the clutch is disengaged.

A first preparation step in which the control unit controls the hydraulic pressure of the actuator to the first reference value after the learning condition determination step but before the first measurement step; and a second preparation step in which the control unit controls the hydraulic pressure of the actuator to the second reference value after the first measurement step but before the second measurement step.

In the correction step, a data map in which a correction value of the touch point value according to the deviation value is predetermined is stored in the control unit, and the control unit may determine the correction value by substituting the deviation value into the data map.

In the correction step, the control unit may correct the touch point value so that the touch point value increases as the comparison response time becomes larger than the reference response time.

Meanwhile, a vehicle clutch control system according to the present invention for achieving the above object is a wet type and includes a plurality of clutches provided in a transmission; an actuator provided to engage and disengage each of the plurality of clutches according to hydraulic pressure; A hydraulic sensor provided to measure hydraulic pressure of the actuator; and determining whether the learning condition for the touch point value of any one of the plurality of clutches has been satisfied, and increasing the actuator hydraulic pressure of the clutch for which the learning condition is satisfied from a first reference value higher than the touch point value to the reference hydraulic pressure. Measure the reference response time required to increase the hydraulic pressure of the actuator from a second reference value lower than the touch point value to the reference hydraulic pressure above the touch point value. and a control unit provided to measure, calculate a deviation value between the comparison response time and the reference response time, and correct the touch point value of the clutch according to the deviation value.

According to the vehicle clutch control method and control system described above, stable and accurate control of the clutch is possible by accurately and reliably identifying and correcting the touch point of the clutch, which can always change due to the influence of rotational speed and temperature. You can do it.

In particular, in the present invention, in a clutch using a hydraulically controlled actuator, by identifying the touch point of the clutch through the response time of the actuator hydraulic control, it is possible to identify the touch point considering hydraulic characteristics and the Touchpoints can be identified with minimal impact.

In addition, the present invention is particularly advantageous in stably and accurately identifying the touch point of the clutch considering hydraulic characteristics in a dual-clutch type transmission using a wet clutch.

Meanwhile, the present invention uses response time analysis according to the hydraulic control, and uses a data map in which touch point correction values are predetermined according to response time analysis information, thereby enabling highly reliable touch point learning or correction.

1 is a flowchart showing a vehicle clutch control method according to an embodiment of the present invention;
2 is a diagram schematically showing a clutch control system of a vehicle according to an embodiment of the present invention;
Figure 3 is a graph showing the actuator hydraulic control situation for touch point learning in the vehicle clutch control method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be looked at with reference to the attached drawings.

1 to 3, the vehicle clutch control method according to the present invention includes a learning condition determination step (S100) in which the control unit 200 determines whether the learning condition for the touch point value of the clutch 120 is satisfied; When the learning condition is met, the control unit 200 sets the standard response time required to increase the hydraulic pressure of the actuator 140 of the clutch 120 by the standard hydraulic pressure from the first reference value higher than the touch point value. First measurement step (S250); After the first measurement step (S250), the control unit 200 increases the hydraulic pressure of the actuator 140 by the reference hydraulic pressure from a second reference value lower than the touch point value to more than the touch point value. A second measurement step (S350) of measuring the required comparison response time; and a correction step (S400) of calculating a deviation value between the comparison response time and the reference response time and correcting the touch point value according to the deviation value.

Looking at this in detail, it is as follows. First, in the learning condition determination step (S100), the control unit 200 determines whether the learning condition for the touch point value of the clutch 120 is satisfied.

In order to learn the touch point of the clutch 120, the clutch 120 must first be in a state that does not affect the driving of the vehicle.

Therefore, the control unit 200 determines whether the clutch 120 corresponds to a power transmission path for driving the vehicle, and further determines whether the gear stage 190 of the input shaft 180 equipped with the clutch 120 is synchronized with the wheel. Determine whether power transmission is not achieved.

In addition to the above conditions, the learning conditions for learning the touch points of the clutch 120 may vary, and details will be described later.

Meanwhile, in the first measurement step (S250), when the learning condition is met, the control unit 200 increases the hydraulic pressure of the actuator 140 of the clutch 120 by the standard hydraulic pressure from the first reference value higher than the touch point value. Measure the standard response time required to rise.

The clutch 120 to which the present invention is applied preferably uses a hydraulic actuator 140. However, this does not mean that application of the present invention is excluded in cases where other types of actuator 140 are used.

In the present invention, the clutch 120 in which the learning conditions are met is in a state in which whether it is engaged or released does not affect the driving of the vehicle, and in particular, it corresponds to the state in which the clutch 120 is disengaged. According to a preferred embodiment of the present invention, the hydraulic pressure of the actuator 140 of the clutch 120 is controlled by the control unit 200.

The control unit 200 may correspond to an ECU that controls an engine, etc., or may be a TCU that controls the clutch 120 or transmission. Furthermore, it may be another control unit provided separately from the ECU and TCU.

Meanwhile, the clutch 120 of the present invention preferably corresponds to a friction type clutch 120. In other words, the friction disk is in close contact with the drive plate mounted on the crankshaft and transmits torque through mutual friction.

The touch point refers to a reference point at which the clutch 120 transmission torque is 0 or more. When using a hydraulic actuator 140 as in the present invention, the touch point value can be measured as the hydraulic pressure value of the actuator 140.

Meanwhile, in the hydraulic control of the actuator 140, the present invention learns the touch point by using the fact that the response time required to track the actual hydraulic value to the control target value is different before and after the touch point.

In the first measurement step (S250), the control unit 200 increases the hydraulic pressure of the actuator 140 by the reference hydraulic pressure from a first reference value that is greater than or equal to the touch point value. That is, in the first measurement step (S250), the hydraulic pressure of the actuator 140 is controlled to increase by the reference hydraulic pressure at a value equal to or higher than the touch point.

At this time, the time required for the hydraulic pressure of the actuator 140 to increase by the reference hydraulic pressure by the control can be viewed as the response time according to the hydraulic control, and the present invention provides the response time in the first measurement step (S250). is defined as the standard response time.

The first reference value corresponds to a hydraulic pressure value greater than or equal to the touch point value, and this is preferably understood as a relative value to the touch point value. That is, a value obtained by increasing a predetermined value from the touch point value corresponds to the first reference value, and when the touch point is corrected, the first reference value may also change.

The reference hydraulic pressure is also a value preset in the control unit 200, and can of course be changed according to the touch point value or the first reference value.

The reference response time measured in the first measurement step (S250) has the technical meaning of the response time required for the hydraulic pressure of the actuator 140 to increase by the reference hydraulic pressure at the hydraulic pressure above the touch point.

If the clutch 120 is in a situation before the touch point, when controlling to increase the hydraulic pressure of the actuator 140, it takes time for oil to be filled in the oil path of the actuator 140. Furthermore, since this occurs before the friction disk of the clutch 120 contacts the drive plate, there is no interference with the movement of the friction disk, so it can be understood that the response time required for the increase in hydraulic pressure is longer compared to the hydraulic pressure situation above the touch point.

That is, before the touch point of the clutch 120, the response time increases compared to the situation after the touch point because the time required to fill the oil path with oil and the repulsive force against the movement of the friction disk are weak.

Ultimately, in consideration of the above characteristics, the present invention determines the standard response time required for the hydraulic pressure of the actuator 140 to increase from the hydraulic pressure above the touch point to the reference hydraulic pressure in the first measurement step (S250).

A graph showing the hydraulic control situation of the actuator 140 according to the first measurement step (S250) is shown in FIG. 3. In the graph of FIG. 3, the horizontal axis represents time, and the vertical axis represents hydraulic pressure of the actuator 140.

Figure 3 shows the hydraulic control situation in the first measurement step (S250) and the second measurement step (S350). The hydraulic control performed first in time order corresponds to the first measurement step (S250). In FIG. 3, it can be seen that the increase in the reference oil pressure in the first measurement step (S250) starts at a value higher than the touch point value, and the oil pressure value that has started to be controlled to increase by the reference oil pressure corresponds to the first reference value.

Meanwhile, in the second measurement step (S350), after the first measurement step (S250), the control unit 200 adjusts the hydraulic pressure of the actuator 140 from a second reference value lower than the touch point value to more than the touch point value. Measure the comparison response time required to increase the reference hydraulic pressure to the above level.

After measuring the reference response time in the first measurement step (S250), the control unit 200 reduces the hydraulic pressure of the actuator 140 to below the touch point again. In particular, in the second measurement step (S350), the control unit 200 increases the hydraulic pressure of the actuator 140 from a second reference value lower than the touch point value to the reference hydraulic pressure.

The hydraulic pressure of the actuator 140, which increases at a value lower than the touch point value, may take time for oil to fill the oil path, and furthermore, the repulsive force exerted by the friction disk is smaller than when the hydraulic pressure rises above the touch point value, so the hydraulic pressure Response time may be delayed due to rise.

That is, the hydraulic pressure of the actuator 140, which rises by the standard hydraulic pressure in the second measurement step (S350), passes through a section lower than the touch point value and falls into a section higher than the touch point, and increases by the standard hydraulic pressure in the section entirely higher than the touch point value. Response time increases compared to rising hydraulic pressure.

Ultimately, the present invention is based on the reference response time required for the hydraulic pressure of the actuator 140 to increase by the standard hydraulic pressure above the touch point value, and the comparison response time required for the hydraulic pressure of the actuator 140 to increase by the standard hydraulic pressure from the value below the touch point. By comparing, correction of the touch point is performed through the difference in response time.

Like the first reference value, the second reference value in the second measurement step (S350) also corresponds to a relative value determined based on the touch point value, not an absolute value for hydraulic pressure. The first reference value and the second reference value may be determined as various values.

Preferably, considering a situation in which the actual touch point value is higher or lower than the touch point value that is the current learning standard, the first reference value and the second reference value sufficiently reflect the actual touch point value to be corrected. Make sure there is a difference from the current touch point value so that there is a difference. At this time, the correction value of the touch point value can be statistically calculated and considered in setting the first and second reference values.

In one embodiment of the present invention, one offset value can be set, a value increased by the offset value from the current touch point value can be set as the first reference value, and a value decreased by the current touch point value by the offset value can be set. 2Can be set as a standard value. In addition to this, various methods can be applied.

Figure 3 shows the hydraulic control situation in the second measurement step (S350) performed after the first measurement step (S250) in chronological order. In the second measurement step (S350), the hydraulic pressure of the actuator 140 is increased by the reference hydraulic pressure from the second reference value, which is lower than the first reference value in the first measurement step (S250) and lower than the touch point value. can confirm.

At this time, it is preferable that the value increased by the standard oil pressure from the second reference value is set to be greater than or equal to the current touch point value. This is because the comparison response time must reflect both the hydraulic response times before and after the touch point value so that the touch point value can be corrected through comparison with the standard response time.

Meanwhile, looking at Figure 3, the standard response time and comparative response time required to increase the standard oil pressure are indicated on the horizontal axis. It can be confirmed that the comparison response time measured in the second measurement step (S350) has a greater value than the reference response time measured in the first measurement step (S250).

Meanwhile, in the correction step (S400), the deviation value between the comparison response time and the reference response time is calculated, and the touch point value is corrected according to the deviation value.

Specifically, when the current touch point value has an accurate value, when performing the second measurement step (S350), the amount of hydraulic pressure increase in the actuator 140 in the section below the touch point value can be predicted. .

Depending on the amount of hydraulic pressure increase in the section below the predicted touch point value, the time increased compared to the standard response time required to increase the standard hydraulic pressure in the section above the touch point value by reflecting the current hydraulic characteristics can be determined experimentally or theoretically. there is.

In other words, assuming the current touch point value, the increase in comparison response time compared to the standard response time can be expected, and the result is judged in the correction step (S400).

If the increase in the comparative response time relative to the reference response time is greater than the expected value assuming the current touch point value, the process of increasing the hydraulic pressure of the actuator 140 by the reference hydraulic pressure in the second measurement step (S350) is currently This means that the hydraulic pressure increased more in the section below the touch point value than expected based on the touch point value.

That is, the actual touch point value reflecting the current environment of the clutch 120 and the hydraulic characteristics of the actuator 140 corresponds to a higher value than the currently set touch point value, and through this, the touch point value can be corrected. There will be.

Conversely, if the increase in the comparison response time relative to the reference response time is less than the expected value, the process of increasing the hydraulic pressure of the actuator 140 by the reference hydraulic pressure in the second measurement step (S350) occurs in a section below the touch point value than expected. This means that a smaller hydraulic pressure increase has been experienced, which means that the current actual touch point value is lower than the touch point value set in the control unit 200.

In this way, the deviation value is derived by comparing the comparative response time based on the standard response time required to increase the standard hydraulic pressure at a value greater than the touch point, reflecting the current environment of the clutch 120 and the hydraulic characteristics of the actuator 140. By analyzing, it is possible to correct the touch point value to the actual touch point value.

Here, the correlation between the deviation value and the correction value of the touch point can be theoretically calculated by considering the reference response time, first reference value, second reference value, correction value, reference hydraulic pressure, etc., and further, the experimental results can be determined statistically. You can.

Ultimately, the present invention sufficiently excludes the influence of the environment such as temperature by comparing and analyzing the response time to hydraulic control below and above the touch point value of the clutch 120, and provides accurate and reliable results reflecting hydraulic characteristics. Learning of touch points is possible.

Figure 1 shows the sequence of the control method according to the present invention, Figure 2 schematically shows a control system to which this control method is applied, and Figure 3 shows the hydraulic pressure of the actuator 140 according to the present invention as described above. The control situation is schematically shown.

Meanwhile, as shown in FIG. 2, in the vehicle clutch control method according to an embodiment of the present invention, the clutch 120 corresponds to one of a plurality of wet clutches 120 provided in the transmission.

Specifically, the clutch 120 may be provided in various types, and the embodiment of the present invention is particularly a wet type, and learns the touch point of any one of the plurality of clutches 120 provided.

Preferably, in a dual-clutch type transmission equipped with two clutches 120, the clutch 120 is provided as a wet clutch, and more preferably, the clutch 120 corresponds to a wet multi-plate clutch.

In the case of a dual clutch, the drive shaft and the non-drive shaft frequently alternate during the driving process, so learning the touch point of the clutch 120 of the non-drive shaft is especially important in clutch control. In addition, the clutch 120 of the non-driving shaft may be in a released state even though the vehicle is running, so the touch point learning method of the present invention may be particularly advantageous.

Furthermore, in the case of a wet clutch, it operates in a state immersed in oil, so in learning the touch point of the clutch 120, the viscosity of the fluid acts despite the release of the clutch 120, so that the clutch 120 or the input shaft 180 There are many limitations and disadvantages in learning touch points by analyzing rotation speed, etc.

Since the present invention learns touch points by analyzing information derived from hydraulic control of the actuator 140, it is particularly advantageous for learning touch points in the wet clutch as described above. This is because touch points can be learned while sufficiently excluding factors that may affect other touch point learning, such as the viscosity of the fluid.

Ultimately, the embodiment of the present invention learns and corrects the touch point accurately and reliably, despite the limitations and increased uncertainty of other methods, by learning the touch point of any one of a plurality of wet clutches. It is advantageous to be able to do it.

Figure 2 shows a preferred embodiment of the present invention, in which, in a dual-clutch type transmission, the dual clutch is provided as a wet multi-plate clutch.

Meanwhile, as shown in FIG. 2, in the vehicle clutch control method according to an embodiment of the present invention, the control unit 200 controls the transmission in a neutral state or the gear stage (180) of the input shaft 180 on which the clutch 120 is mounted. 190) is released and when the clutch 120 is disengaged, it is determined that the learning condition is satisfied.

As described above, the learning condition of the present invention ultimately corresponds to a condition that satisfies a situation in which the control of the clutch 120 and the driving situation of the vehicle do not affect each other. In particular, in an embodiment of the present invention, the transmission is controlled to a neutral state or the gear stage 190 of the input shaft 180 on which the clutch 120 is mounted is released, and the clutch 120 is released. It is determined that the learning conditions according to the present invention are met.

Specifically, the neutral state of the transmission may mean that both the clutch 120 and the gear stage 190 of the input shaft 180 are released. In this case, the torque transmitted from the wheel is not transmitted to the input shaft 180 on which the clutch 120 is mounted, and the torque transmitted from the driving source such as the engine is not transmitted to the clutch 120, a factor that may interfere with touch point learning. is judged to have been sufficiently excluded.

Meanwhile, when a plurality of clutches 120, such as a dual-clutch type transmission, are provided, even if the transmission is not in a neutral state, the clutch 120 that requires touch point learning may be in the released state, and the clutch 120 is installed. The gear stage 190 of the input shaft 180 may also be in a released state. (This can be understood as a case where the corresponding input shaft 180 is a non-driving shaft.)

As described above, in the embodiment of the present invention, as a learning condition for learning the touch point of the clutch 120, the neutral control of the transmission or the release of the corresponding clutch 120 as well as the input shaft 180 gear on which the corresponding clutch 120 is mounted By determining the unlocked state of stage 190, it is possible to learn the touch point while the influence of the driving source or vehicle driving is sufficiently excluded.

Meanwhile, as shown in FIG. 2, in the vehicle clutch control method according to an embodiment of the present invention, after the learning condition determination step (S100) and before the first measurement step (S250), the control unit 200 controls the actuator. A first preparation step (S200) of controlling the hydraulic pressure of (140) to the first reference value; and a second preparation step (S300) in which the control unit 200 controls the hydraulic pressure of the actuator 140 to the second reference value after the first measurement step (S250) but before the second measurement step (S350). Also includes ;.

Specifically, in order to perform the first measurement step (S250), the hydraulic pressure of the actuator 140 is required to correspond to the first reference value. However, even if the control unit 200 sets the control target value of the hydraulic pressure to the first reference value to perform the first measurement step (S250), a response time occurs as described above and the hydraulic pressure of the actuator 140 does not reach the first reference value. It may not be possible.

Therefore, in the embodiment of the present invention, the first preparation step (S200) is performed prior to performing the first measurement step (S250). In the first preparation step (S200), the hydraulic pressure of the actuator 140, which has an arbitrary value, is made to follow the first reference value.

By performing the first preparation step (S200), the reference response time measurement in the first measurement step (S250) can be performed with certainty and reliability.

Likewise, in the embodiment of the present invention, before performing the second measurement step (S350), the second preparation step (S300) is performed. In the second preparation step (S300), especially while performing the first measurement step (S250), the hydraulic pressure of the actuator 140, which is controlled to a value different from the second reference value, is made to follow the second reference value.

Accordingly, after performing the first measurement step (S250), the second measurement step (S350) for measuring the comparison response time can be performed reliably and with high reliability.

Figure 1 shows the control method sequence according to an embodiment of the present invention, including the first preparation step (S200) and the second preparation step (S300).

Meanwhile, in the vehicle clutch control method according to an embodiment of the present invention, in the correction step (S400), the control unit 200 stores a data map in which a correction value of the touch point value according to the deviation value is predetermined, and , the control unit 200 determines the correction value by substituting the deviation value into the data map.

Specifically, the control unit 200 stores a data map in which a correction value of a touch point for the deviation value between the reference response time and the comparison response time is predetermined. There are various variables that can affect the correlation between the deviation value and the correction value as in the present invention, and theoretically, it is a burden for the control unit 200 to calculate it directly.

Accordingly, a predetermined data map regarding the correlation between the correction value and the deviation value is stored in advance in the control unit 200, and the control unit 200 substitutes the current deviation value into the data map to obtain the correction value of the touch point. can be derived accurately and quickly.

Although the correlation between the correction value and the deviation value may be achieved through theoretical calculation, the touch point may change sensitively depending on the operating environment of the clutch 120, etc., and to improve the accuracy, preferably experiment A data map that reflects realistic and statistically derived results is used.

Ultimately, in an embodiment of the present invention, the reference response time and comparison response time are compared using the difference in response time to hydraulic pressure increase before and after the touch point, and the comparison result is substituted into a data map reflecting experimental and statistical results. By deriving the correction value of the touch point, accurate and rapid correction of the touch point is possible.

Meanwhile, in the vehicle clutch control method according to an embodiment of the present invention, in the correction step (S400), the control unit 200 controls the touch point value to increase as the comparison response time is greater than the reference response time. Correct the point value.

As described above, in the present invention, it is understood that the increase in hydraulic pressure of the actuator 140 before the touch point increases the response time compared to the increase in hydraulic pressure of the actuator 140 after the touch point under the same conditions.

This is due to the difference in oil filling and repulsion force on the oil path, and the present invention corrects the touch point by the difference in response time before and after the above touch point.

The above results are also revealed in the deviation value between the standard response time and the comparative response time. The larger the increase in comparison response time based on the standard response time, this means that there were more sections in which the increase in hydraulic pressure of the actuator 140 in the second measurement step (S350) increased in the section below the touch point, which means that the actual This suggests that the touch point of is greater than the touch point value currently set in the control unit 200.

Ultimately, in an embodiment of the present invention, the larger the comparison response time is than the reference response time, the larger the correction value for increasing the touch point value stored in the control unit 200 becomes. Conversely, the smaller the comparison response time is than the reference response time, the larger the correction value is. The correction amount for reducing the touch point value stored in the control unit 200 increases.

Meanwhile, as shown in FIG. 2, the clutch control system of a vehicle according to an embodiment of the present invention is a wet type and includes a plurality of clutches 120 provided in the transmission; an actuator 140 provided to engage and disengage each of the plurality of clutches 120 according to hydraulic pressure; A hydraulic sensor 160 provided to measure the hydraulic pressure of the actuator 140; and determine whether the learning condition for the touch point value of any one of the plurality of clutches 120 is satisfied, and adjust the hydraulic pressure of the actuator 140 of the clutch 120 for which the learning condition is satisfied to be higher than the touch point value. The reference response time required to increase the reference oil pressure from a higher first reference value is measured, and the hydraulic pressure of the actuator 140 is adjusted from a second reference value lower than the touch point value to the touch point value or more. A control unit provided to measure the comparison response time required to increase the hydraulic pressure, calculate a deviation value between the comparison response time and the reference response time, and correct the touch point value of the clutch 120 according to the deviation value. Includes (200);

Specifically, the clutch 120 is provided in plural numbers and is provided as a wet clutch. Preferably, in a dual-clutch type transmission, the clutch is provided as a wet clutch.

Meanwhile, the actuator 140 is provided hydraulically and controls the transmission torque of each of the plurality of clutches 120 hydraulically. More specifically, the transmission torque of each clutch 120 is controlled by adjusting the hydraulic pressure pressing each of the plurality of clutches 120.

The hydraulic sensor 160 is provided to measure the hydraulic pressure of the actuator 140, and is connected to the control unit 200 to transmit hydraulic information of the actuator 140 to the control unit 200.

Meanwhile, the control unit 200 determines whether the learning condition for the touch point value of any one of the plurality of clutches 120 is satisfied, and operates the hydraulic pressure of the actuator 140 of the clutch 120 for which the learning condition is satisfied. The standard response time required to increase the hydraulic pressure from a first reference value higher than the touch point value is measured, and the hydraulic pressure of the actuator 140 is increased from a second reference value lower than the touch point value to the touch point. Measure the comparison response time required to increase the reference hydraulic pressure to a value greater than or equal to the value, calculate a deviation value between the comparison response time and the reference response time, and determine the touch point of the clutch 120 according to the deviation value. It is prepared to correct the value.

Accordingly, the vehicle clutch control system according to an embodiment of the present invention accurately and reliably identifies and corrects the touch points of the clutch 120, which can constantly change due to the influence of the rotational speed and oil temperature of the clutch 120. , enabling stable and accurate control of the clutch 120.

Although the present invention has been shown and described in relation to specific embodiments, it is known in the art that the present invention can be modified and changed in various ways without departing from the technical spirit of the invention as provided by the following claims. It will be self-evident to those with ordinary knowledge.

S100: Learning condition judgment step S250: First measurement step
S350: Second measurement step S400: Correction step
120: Clutch 140: Actuator
200: control unit

Claims (7)

A learning condition determination step in which the control unit determines whether the learning condition for the touch point value of the clutch has been met;
When the learning condition is met, a first measurement step in which the control unit measures a standard response time required to increase the actuator hydraulic pressure of the clutch by the standard hydraulic pressure from a first reference value higher than the touch point value;
After the first measurement step, the control unit measures the comparison response time required to increase the hydraulic pressure of the actuator by the reference hydraulic pressure from a second reference value lower than the touch point value to more than the touch point value. 2nd measurement step; and
A clutch control method for a vehicle comprising: calculating a deviation value between the comparison response time and the reference response time, and correcting the touch point value according to the deviation value. In claim 1,
A clutch control method for a vehicle, wherein the clutch is one of a plurality of wet clutches provided in the transmission. In claim 1,
The control unit determines that the learning condition is satisfied when the transmission is in a neutral state or the gear stage of the input shaft on which the clutch is mounted is disengaged, and the clutch is disengaged. Clutch control method. In claim 1,
A first preparation step in which the control unit controls the hydraulic pressure of the actuator to the first reference value after the learning condition determination step but before the first measurement step; and
A clutch control method for a vehicle further comprising: a second preparation step in which the control unit controls the hydraulic pressure of the actuator to the second reference value after the first measurement step but before the second measurement step. In claim 1,
In the correction step, a data map in which a correction value of the touch point value according to the deviation value is predetermined is stored in the control unit, and the control unit determines the correction value by substituting the deviation value into the data map. A vehicle clutch control method using . In claim 1,
In the correction step, the control unit corrects the touch point value so that the touch point value increases as the comparison response time becomes larger than the reference response time. A plurality of wet type clutches provided in the transmission;
an actuator provided to engage and disengage each of the plurality of clutches according to hydraulic pressure;
A hydraulic sensor provided to measure hydraulic pressure of the actuator;
Determine whether the learning condition for the touch point value of any one of the plurality of clutches is satisfied, and increase the actuator hydraulic pressure of the clutch for which the learning condition is satisfied by the reference hydraulic pressure from the first reference value higher than the touch point value. Measure the reference response time required to increase the hydraulic pressure of the actuator from a second reference value lower than the touch point value to the reference hydraulic pressure above the touch point value. and a control unit provided to calculate a deviation value between the comparison response time and the reference response time, and to correct the touch point value of the clutch according to the deviation value.

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