KR101717713B1 - Determination system of variable preload for multiple disc clutch - Google Patents

Abstract

The present invention introduces a preload determination system for a multi-disc clutch for a vehicle, comprising: a pressure sensor for checking hydraulic pressure supplied to a piston side in contact with a clutch pack; a preload learning determination unit that receives hydraulic pressure information from the pressure sensor, derives a pressure drop rate over time, and selects a preload amount; a preload correction unit for comparing and determining the present preload amount selected in the preload learning determination unit with a pre-selected previous preload amount and deriving a new preload amount; and a drive control unit for controlling the hydraulic pressure to be supplied to the piston side by the new preload amount derived from the preload correction unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a multi-plate clutch for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system for determining the preload of a multi-plate clutch for a vehicle in which the clutch is connected at a quick response speed when the clutch is connected by moving the piston.

A clutch is applied to disconnect and connect the power to the vehicle for shifting. Such a clutch is classified into a dry clutch and a wet clutch, and the dry clutch is classified into a single plate clutch, a double clutch, a multiplate clutch, and the like.

A general multi-plate clutch for a vehicle is configured such that the clutch is connected or disconnected by moving the piston using hydraulic pressure. The multi-plate clutch comprises a reservoir tank for storing oil, a motor pump for transmitting hydraulic pressure in the reservoir tank, a piston which is moved by hydraulic pressure generated from the motor pump and is in contact with the clutch, And a relief valve that returns oil when the oil pressure supplied from the motor pump exceeds the set pressure.

When the hydraulic pressure is not generated from the motor pump, the piston is elastically supported by the return spring, so that the piston does not have sufficient frictional force to the clutch pack and performs the slip motion. Thereby, no power is transmitted through the clutch, and rotational power is not transmitted to the output shaft.

Here, when the motor pump is operated to generate the hydraulic pressure, the piston is moved by the hydraulic pressure, and the piston is moved, so that a sufficient frictional force is generated in the clutch pack and the power is transmitted.

However, in the conventional multi-plate clutch, the motor pump is operated according to the use / non-use of the clutch without considering the temperature of the engine oil, the amount of change in the hydraulic pressure and the state of the clutch. Is generated.

In particular, in response to an operation response time when a clutch is connected, there is a need for a technique for improving the four wheel drive vehicle, which is sensitive to a four-wheel drive vehicle in which switching from a two-wheel drive mode to a four-

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 20-1998-0031644 U (1998.08.17)

The present invention has been proposed in order to solve such a problem, and it is an object of the present invention to improve the operational response by applying a pre-pressure when connecting the clutch and to satisfy the preload condition by continuously learning the pre- The present invention has been made in view of the above problems, and it is an object of the present invention to provide a preload determination system for a multi-plate clutch for a vehicle.

In order to achieve the above object, according to the present invention, there is provided a system for determining the preload of a multi-disc clutch for a vehicle, comprising: a pressure sensor for checking an oil pressure supplied to a piston side contacting a clutch pack; A preload learning judging unit for receiving the hydraulic pressure information from the pressure sensor and deriving a pressure drop rate with time over a pressure value to select a preload amount; A pre-pressure correcting unit for comparing the present pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre- And a drive control unit for controlling the oil pressure to be supplied to the piston side by the new preload amount derived from the preload correction unit.

And a learning condition determiner for receiving temperature information of the oil through a temperature sensor for checking the temperature of the oil and determining whether the preload amount learning condition is satisfied according to the oil temperature.

Wherein the learning condition determining unit stores the reference temperature range according to the oil temperature and performs the preload learning through the preload learning determining unit when the oil temperature is within the reference temperature range.

And the pressure information checked by the pressure sensor is outputted to the preload learning determination unit after the noise component is removed through the noise filter.

And the preload learning determination section derives the pressure drop rate in a state in which the driving of the motor pump for supplying to the piston side in contact with the clutch pack is stopped.

The preload learning determination unit compares the pressure value of the current point with the preset designated time and the pressure value of the previous designated time to derive the pressure drop rate per unit time.

The preload learning determination unit may select the current pressure value as the current preload when the pressure drop rate is maintained at a constant level for a predetermined period of time.

Wherein the preload learning determination unit compares the selected preload amount with a pre-selected preload amount and invalidates the current preload when the difference between the present preload amount and the previous preload amount is outside the predefined effective range; And further comprising:

And the validity determination unit validates the current preload when the difference between the previous preload amount and the current preload amount is smaller than the average preload variation amount.

The preload correction unit is provided with a weight for the previous preload and the current preload, and derives a new preload through the sum of the previous preload and the current preload.

Wherein the weight provided to the preload correcting unit is set so that the weight applied to the previous preload is larger than the weight applied to the preload.

According to the preload determination system of the multi-plate clutch for a vehicle having the above-described structure, a preload is applied when the clutch is engaged to improve the operational response.

In particular, considering the internal factors such as clutch wear, the preload is continuously learned and the optimum preload condition is maintained, so that the clutch connection is operated at a high response speed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a preload amount determination system for a multi-plate clutch for a vehicle according to an embodiment of the present invention; FIG.
2 to 6 are diagrams for explaining a preload determination system of a multi-plate clutch for a vehicle according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a system for determining the preload of a multi-plate clutch for a vehicle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a configuration diagram of a preload amount determining system for a multi-plate clutch for a vehicle according to an embodiment of the present invention, and FIGS. 2 to 6 are views for explaining a preload amount determining system for a multi-plate clutch for a vehicle according to an embodiment of the present invention. to be.

As shown in Fig. 1, the preload determination system of the multi-plate clutch for a vehicle according to the present invention comprises: a pressure sensor 10 for checking the oil pressure supplied to the piston 20 contacting the clutch pack; A preload learning judging unit (100) for receiving hydraulic pressure information from the pressure sensor (10) and deriving a pressure drop rate with time over a pressure value to select a present preload; A preload correction unit (200) for comparing the present preload amount selected by the preload learning determination unit (100) with a predetermined preload amount to derive a new preload amount; And a drive control unit 300 for controlling the hydraulic pressure to be supplied to the piston 20 side by the new preload amount derived from the preload correction unit 200.

As shown in FIG. 1, the multi-plate clutch includes a reservoir tank 50 for storing oil, a motor pump 40 for transmitting hydraulic pressure in the reservoir tank 50, A return spring 60 for moving the piston 20 in a direction opposite to the moving direction of the piston 20; a relief 60 for returning oil when the amount of hydraulic pressure supplied from the motor pump 40 is equal to or higher than a set pressure; A valve 70, and an orifice 80 to return the oil leaked from the motor pump 40 at the same time.

In the present invention, in order to improve the operating responsiveness of the clutch, the motor pump 40 is operated to move to a point just before the piston 20 comes into contact with the multi-plate clutch. At this time, a preload is applied as the hydraulic pressure is transmitted from the motor pump 40. This preload is set so as to maintain the state immediately before the piston 20 is initially in contact with the multi-plate clutch. However, since the transmission torque can be changed as the clutch is worn, the difference in the preload amount is corrected through repeated learning of the preload change amount due to the clutch wear, thereby maintaining and improving the operating response performance through the optimum preload amount.

First, a learning condition determining unit 400 receives temperature information of the oil through a temperature sensor 30 for checking the temperature of the oil, and determines whether the pre-charge amount learning condition is satisfied according to the oil temperature.

This is to prevent erroneous learning due to the difference in the oil level leaked to the orifice 80 side in the low temperature region or the high temperature region where the oil viscosity varies excessively depending on the oil temperature. Here, the preload amount learning condition is a temperature range in which no interference occurs during preload learning according to the oil temperature, and can be derived in advance through the experimental value and can be set to the following reference temperature range.

That is, the learning condition determination unit 400 stores the reference temperature range according to the oil temperature, and if the oil temperature is within the reference temperature range, pre-learning is performed through the pre-learning determination unit 100. [ On the other hand, when the oil temperature does not exceed the reference temperature range, the preload learning determination unit 100 prevents the preload learning from being performed because there is a risk of erroneous learning in preload learning.

In this way, when it is determined that the learning condition determination unit 400 can perform preload learning, the preload learning determination unit 100 receives the hydraulic pressure information from the pressure sensor 10. Here, the pressure sensor 10 checks the oil pressure supplied to the piston 20 in contact with the clutch pack. The pressure information checked by the pressure sensor 10 may include various noise components, It is preferable that pressure information on which the components have been removed is transmitted to the preload learning determination unit 100. For this purpose, a low-pass filter, a moving average filter and the like can be applied to the noise filter.

Then, the learning condition determination unit 400 receives the hydraulic pressure information from the pressure sensor 10, derives the pressure drop rate with passage of time, and selects the current preload amount according to the pressure drop rate.

However, the preload learning determination unit 100 may derive the pressure drop rate in a state where the driving of the motor pump 40 for supplying the piston 20 to the piston 20 in contact with the clutch pack is stopped. That is, when the motor pump 40 is driven, hydraulic pressure is supplied to the piston 20, so that the pressure drop is derived from the state where the drive of the motor pump is stopped.

2, when the feedback control of the motor pump 40 is completed through the learning condition determiner 400 in a state of satisfying the preload amount learning condition according to the oil temperature, the motor drive voltage is applied The pressure drop starts from the point where it is not. At this time, it is possible to derive the noise-removed pressure information through the noise filter by measuring the pressure value through the pressure sensor 10, and thereby it is possible to derive a more accurate pressure drop rate.

Here, the reason for deriving the pressure drop rate to select the preload amount is that a certain amount of preload is applied to bring the piston back into contact with the clutch after the motor is stopped. The pressure prevailing after the pressure drop rate is derived, You can.

3, the preload learning determining unit 100 determines whether or not the pressure value of the present point of time corresponding to the elapse of the preset designated time and the pre- The pressure drop rate per unit time can be derived by comparing the pressure values.

This pressure drop rate can be calculated through the following equation.

Here, t0 denotes the current time, and t-1 denotes the previous designated time. Thus, the pressure drop rate that is calculated over time can be deduced by continuously deriving the calculated pressure drop rate at a preset designated time.

When the pressure drop rate is derived, the pre-pressure learning determination unit 100 can select the current pressure value as the current preload when the pressure drop rate is maintained at a constant level for a predetermined time. That is, as shown in FIG. 4, the pressure drop rate is checked at each designated time. If the pressure drop rate is maintained for a predetermined period of time in a period where the pressure drop rate is maintained at a predetermined level, . Preferably, as shown in FIG. 4, except for the initial point at which the pressure drop rate is maintained at a constant level during a period (a) where the pressure drop rate is maintained at a constant level, the average value of the pressure value It is now possible to select the preload amount by selecting the preload amount.

On the other hand, the preload learning determination unit 100 compares the selected pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre- And a validity determining unit (500) for processing the received data.

If the difference between the previous preload amount and the current preload amount is smaller than the average preload variation amount, the validity determination unit 500 can validate the current preload amount.

That is, the pre-press learning determining unit 100 compares the selected pre-pressurization amount with the previous pre-pressurization amount to determine whether the present pre-pressurization amount is an appropriate level. The present preload amount is erroneously derived and is invalidated to prevent the occurrence of errors in the preload system.

To this end, the preload learning determination unit 100 first checks whether the difference of the preload amount preliminarily selected as the current preload amount is within the valid range. In this case, the effective range is a pre-selected minimum pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-

In addition, the preload learning determination unit 100 compares the difference between the previous preload and the current preload to the average preload variation to check the validity of the current preload. At this time, the previous preload amount may be a value immediately before the current preload amount is selected, and the average preload amount may be set to a mean value of a plurality of previously selected pre-pressurization variations.

That is, the difference between the previous pre-preload amount and the present preload amount is compared with the average preload amount, and if the difference is smaller than the average preload amount, the present preload amount is effectively processed to prevent the wrong pre- have.

Meanwhile, the preload correction unit 200 is provided with weight values for the previous preload amount and the current preload amount in advance, and the new preload amount can be derived from the sum of the previous preload amount and the current preload amount to which the weight is applied. Here, the weight value provided in the preload correction unit 200 may be set to be larger than a weight applied to the previous preload amount, which is greater than a weight applied to the current preload amount.

That is, the selected pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre- For this, weights can be applied through the following equations.

(New preload amount = (1-weighted value) * previous preload amount + (weighted value) * present preloaded amount)

Here, the weight can be set to a value between 0 and 1, and the closer to 1, the closer the result to the current preload. For example, when the weight is set to 1, the weight applied to the previous preload may be set to 0.8, and the weight applied to the preload may be set to 0.2 so that the result of the previous preload may be reflected more significantly.

In this way, when deriving the new preload, it is possible to derive a new preload that is accurate and minimizes error by considering the previous preload by weighting the previous preload and the current preload.

Thus, the new preload amount derived from the preload correction unit 200 is set to a pressure value for providing a preload to the piston 20 by being reflected in the clutch control system, so that the hydraulic pressure is supplied to the piston 20 To be supplied. That is, the hydraulic pressure supplied to the piston 20 side is set as the motor pump 40 is driven by the drive control unit 300.

As shown in FIG. 5, it can be seen that the torque curve is reflected by the learned preload amount in the existing preload amount.

As described above, it is possible to maintain the response performance according to the clutch connection by continuously correcting the preload through learning of the preload variation according to the clutch wear, thereby preventing the change of the transmission torque due to the clutch wear, The clutch resistance can be minimized.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled 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 following claims It will be apparent to those of ordinary skill in the art.

100: Preload learning determination unit 200: Preload correction unit
300: drive control unit 400: learning condition judgment unit
500: validity judgment unit

Claims (11)

A pressure sensor for checking an oil pressure supplied to the piston side in contact with the clutch pack;
A preload learning judging unit for receiving the hydraulic pressure information from the pressure sensor and deriving a pressure drop rate with time over a pressure value to select a preload amount;
A pre-pressure correcting unit for comparing the present pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre-pre- And
And a drive control unit for controlling the hydraulic pressure to be supplied to the piston side by the new preload amount derived from the preload correction unit. The method according to claim 1,
And a learning condition determiner for receiving the temperature information of the oil through a temperature sensor for checking the temperature of the oil and determining whether the preload amount learning condition is satisfied according to the oil temperature, Decision system. The method of claim 2,
Wherein the learning condition determining unit is configured to store the reference temperature range according to the oil temperature and to perform the preload learning through the preload learning determining unit when the oil temperature is within the reference temperature range. The method according to claim 1,
Wherein the pressure information checked by the pressure sensor is outputted to the preload learning determination unit after the noise component is removed through the noise filter. The method according to claim 1,
Wherein the preload learning determiner derives the pressure drop rate in a state in which the driving of the motor pump for supplying to the piston side in contact with the clutch pack is stopped. The method according to claim 1,
Wherein the preload learning determination unit derives a pressure drop rate per unit time by comparing a pressure value at a current point in time with a preset designated time and a pressure value at a previous designated time. The method of claim 6,
Wherein the preload learning determination unit selects the current pressure value as the current preload when the pressure drop rate is maintained at a constant level for a predetermined period of time. The method according to claim 1,
The preload learning determination unit compares the selected preload amount with the pre-selected preload amount, and when the difference between the present preload amount and the pre-selected preload amount exceeds the pre-set effective range, the pre- Further comprising: a determination unit for determining the preload of the multi-plate clutch for vehicles. The method of claim 8,
Wherein the validity determination unit validates the current preload when the difference between the previous preload amount and the current preload amount is smaller than the average preload change amount. The method according to claim 1,
Characterized in that the preload correction unit is provided with a weight for the prevailing prevailing amount and the current preload amount in advance and derives a new preload amount through the sum of the preload amount and the current preload amount to which the weight is applied, Decision system. The method of claim 10,
Wherein the weight provided to the preload correcting unit is set so that the weight applied to the previous preload is set to be larger than the weight applied to the current preload.

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