KR101644313B1 - Apparatus for learning touch point - Google Patents

Abstract

A touch point learning apparatus according to the present invention includes: a clutch set including two elastic members; A motor for outputting an output torque proportional to an input current; A connecting portion for pressing the clutch set in a direction opposite to the elastic force of the elastic member of the clutch set in accordance with the output torque of the motor; And a control unit for controlling an output torque of the motor by supplying a current to the motor, wherein the control unit is configured to support a force transmitted by an elastic force of the clutch set, To gradually increase the current supplied to the motor to press the clutch set via the connection portion and to stop the rotation of the motor by the threshold value of the threshold current value And learns the touch point of the clutch set based on the change.

Description

{APPARATUS FOR LEARNING TOUCH POINT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch point learning apparatus, and more particularly, to a technique for learning a touch point through a change in a current supplied to a clutch actuator motor in a stationary state of a vehicle equipped with a DCT system.

The dual clutch transmission (DCT) system is provided with two clutches, through which the two clutches are connected via hole means and even means, respectively, to transmit or block the power of the engine via a clutch actuator do. DCT system, it is possible to reduce the time during which the output torque of the engine is disconnected, and at the same time, increase the fuel efficiency by eliminating the torque converter as compared with a general automatic transmission system.

In a DCT system using a dry clutch or a friction clutch, a touch point refers to a position at which the clutch starts to actually contact and starts to generate friction, and a kiss point, (Zero point) or the like. Since the dry clutch transmits the power of the engine by friction, the characteristics of the clutch may be caused by wear or heat, and the DCT system usually learns the touch point for each clutch periodically and applies it to the shift control .

Conventionally, a touch point is learned through a combination of values input from the viewpoint of powertrain such as engine speed, clutch speed, engine torque, and the like. According to the related art, in order to confirm such input values on the power train side, the vehicle must be in a state in which the vehicle can be driven, that is, in an engine idling state. In a state in which the vehicle is not allowed to run, Point learning was impossible.

Accordingly, the present invention proposes a method capable of learning a clutch touch point through a change in current provided to a motor that performs a function of the clutch actuator.

It is to be understood that the description described as the background of the above-mentioned invention is merely for enhancing the understanding of the background of the present invention, and it is accepted that it corresponds to the prior art already known to those having ordinary skill in the art It should not be accepted.

An object of the present invention is to provide a touch point learning apparatus capable of learning a touch point of a clutch in accordance with a current supplied to a clutch actuator motor without a vehicle running.

The above object is achieved by a touch point learning apparatus according to the present invention, comprising: a clutch set including two elastic members; A motor for outputting an output torque proportional to an input current; A connecting portion for pressing the clutch set in a direction opposite to the elastic force of the elastic member of the clutch set in accordance with the output torque of the motor; And a control unit for controlling an output torque of the motor by supplying a current to the motor, wherein the control unit is configured to support a force transmitted by an elastic force of the clutch set, To gradually increase the current supplied to the motor to press the clutch set via the connection portion and to stop the rotation of the motor by the threshold value of the threshold current value And learning the touch point of the clutch set based on the change.

Here, the controller may determine a point at which the slope of the threshold current value changes as the touch point of the clutch set.

Here, the clutch set includes an engine-side plate and a transmission-side plate disposed in parallel; A first friction material and a second friction material provided in parallel between the engine side plate and the transmission side plate; A clutch return spring for elastically supporting the engine side plate and the transmission side plate, and a clutch cushion spring for elastically supporting the first friction material and the second friction material.

Here, as the distance between the engine-side plate and the first friction material and the distance between the transmission-side plate and the second friction material are reduced, the magnitude of the critical current value increases, and the engine-side plate and the first friction material And the slope of the critical current value may be changed when the transmission side plate and the second friction material come into contact with each other.

Here, the connection unit may include a rack for contacting with a pinion of the motor to change a rotational motion of the motor into a rectilinear motion and outputting the rectilinear motion; And a connecting bar connected to the rack and in contact with the transmission side plate for transmitting an elastic force of at least one of the output torque of the motor and the clutch return spring and the clutch cushion spring.

Here, the motor may be a BLDC (Brushless Direct Current) motor, and may further include a hall sensor for sensing the rotation of the motor, and the control unit may receive the sensed value of the hall sensor to check whether the motor is stopped .

According to the present invention described above, it is possible to provide a touch point learning apparatus capable of learning a touch point of a clutch according to a current supplied to a clutch actuator motor in a state in which a vehicle is not traveling.

1 is a block diagram of a touch point learning apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram briefly showing each configuration of a touch point learning apparatus according to an embodiment of the present invention.
Figures 3a and 3b show the construction of a clutch set according to an embodiment of the invention.
FIGS. 4A and 4B are graphs showing values varying with the influence of each spring according to an embodiment of the present invention. FIG.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings. The spirit of the present invention should be construed as extending to all modifications, equivalents, and alternatives in addition to the appended drawings.

1 is a block diagram of a touch point learning apparatus according to an embodiment of the present invention.

As shown, the touch point learning apparatus includes a clutch set 100, a connection unit 200, a motor 300, a hall sensor 400, and a control unit 500, and in accordance with a specific embodiment, May be omitted or substituted.

The touch point learning apparatus may be provided on a DCT (Dual Clutch Transmission) system, and the DCT system includes two clutches, and two clutches are connected to each other through hole means and even means through a clutch actuator And is configured to transmit or block the power of the engine. Although one clutch set 100 is shown in Figures 1 and 2, the DCT system may have two clutch sets 100, and a method of learning a touch point for each clutch set 100 Will be the same. Hereinafter, a description will be made with reference to one clutch set 100. The touch point learning apparatus performs touch point learning on the other clutch by the same process after learning the touch point of one clutch set 100 .

Two elastic members are provided in the clutch set 100 to transmit a force due to an elastic force to the motor 300. The rotational force of the motor 300 is changed into a vertical motion through the connecting portion 200, Lt; / RTI >

The control unit 500 includes logic for overall shift control and touch point learning of the DCT system and may be implemented by a known transmission control unit (TCU). The control unit 500 determines the output torque of the motor 300 so that the magnitude of the current output from the control unit 500 to the motor 300 is proportional to the output torque of the motor 300, The output torque of the motor 300 can be controlled through the change of the current magnitude. In the present invention, the control unit 500 may include logic for learning the touch point of the clutch set 100 in a state where the engine of the vehicle is stopped, as will be described in detail later.

As is known, a touch point is a position at which a clutch starts to actually start contacting and starts to generate a frictional force, and corresponds to a time point when the power of the engine starts to be transmitted to the transmission side. The touch point learning apparatus according to the present invention performs learning of a touch point in order to compensate for a change in a touch point caused by clutch wear or the like and unlike the prior art, The touch point can be learned through the change of the current.

The coupling unit 200 transmits the force due to the elastic force of the clutch set 100 to the side of the motor 300 when the vehicle is in the stop state and proceeds to learn the touch point, To the clutch set 100 side. The connection unit 200 may be provided in various forms, and a specific configuration as one embodiment will be described later in detail.

The motor 300 may be provided with a known brushless DC motor. The BLDC motor is obtained by removing a brush from a conventional DC motor (direct current motor), and is supplied to a stator composed of an electric magnet And generates a magnetic force through the current and rotates the rotor including the permanent magnet according to the magnetic force. The three-phase current can be supplied from the control unit 500 and output a predetermined output torque.

The hall sensor 400 detects the rotation position of the BLDC motor 300 and provides the detected rotation position to the control unit 500. The control unit 500 receives feedback of the Hall signal from the hall sensor 400, .

When the touch point learning logic is executed, the control unit 500 provides the motor 300 with a current having a constant threshold current value. Here, the critical current value may be defined as a current value for outputting an output torque of a magnitude that can stop the rotation of the motor 300 by supporting the force transmitted by the elastic force of the clutch set 100.

As described above, the force due to the elastic force of the elastic member provided in the clutch set 100 and the force due to the output torque of the motor 300 act in opposite directions to each other, and when the threshold current value is provided to the motor 300 , The elastic member of the clutch set 100 and the motor 300 are all held stationary by the output of the motor 300 by the output torque of the same magnitude as the force by the elastic force. The control unit 500 can detect whether the motor 300 is rotated through the Hall signal of the Hall sensor 400. The control unit 500 controls the motor 300 so that the motor 300 can maintain the stopped state by feedback control using the Hall signal. The threshold current value can be confirmed.

On the other hand, the magnitude of the elastic force increases in proportion to the magnitude of compression of the elastic member according to the general principle of the elastic force, so that as the elastic member provided in the clutch set 100 is compressed, the magnitude of the critical current value may also increase.

The clutch set 100 includes two elastic members (a clutch return spring 131 and a clutch cushion spring 132), and only an elastic force by the clutch return spring 131 acts before reaching the touch point, All of the elastic force of the clutch return spring 131 and the clutch cushion spring 132 is applied after the touch point. Accordingly, the elastic force in the clutch set 100 rapidly increases around the touch point, and the critical current value also changes abruptly, and the control unit 500 can learn the current touch point by detecting the sudden change.

Hereinafter, a more detailed physical configuration of the touch point learning apparatus according to the present invention will be described with reference to FIG. 2 showing a cross-sectional view of the touch point learning apparatus.

2, the clutch set 100 includes an engine-side plate 111 and a transmission-side plate 112 which are arranged in parallel, and an engine-side plate 111 and a transmission- A clutch return spring 131 and a first friction member 121 and a second friction member 121 for elastically supporting the first friction member 121 and the second friction member 122, the engine side plate 111 and the transmission side plate 112, And a clutch cushion spring 132 for elastically supporting the clutch cushion 122.

And the transmission side plate 112 is provided in a direction parallel to the engine side plate 111. [ A clutch return spring 131 is provided between the engine side plate 111 and the transmission side plate 112 so that the transmission side plate 112 can be pressed by an elastic force opposite to the engine side plate 111.

The first friction material 121 and the second friction material 122 are provided between the engine side plate 111 and the transmission side plate 112 and the length and the length are equal to each other between the engine side plate 111 and the transmission side plate 112 ). A clutch cushion spring 132 is provided between the first friction material 121 and the second friction material 122 so that the first friction material 121 and the second friction material 122 can be pushed away from each other.

It is possible to make a change in frictional force by adjusting the amount of compression of the clutch cushion spring 132 through the rotation of the motor 300 under the control of the control unit 500. This change in frictional force can be controlled by a change in torque that can be transmitted by the clutch appear.

The clutch set 100 may contact the connecting bar 210 of the connecting part 200 and receive a force corresponding to the output torque of the motor 300. The clutch return spring 131 and the clutch cushion spring 132, It is possible to receive a force in the opposite direction of the elastic force.

When the force is transmitted through the transmission side plate 112 in accordance with the rotation of the motor 300, the clutch return spring 131 is compressed and the transmission side plate 112 is brought into contact with the second friction material 122 at a specific moment , The first friction material 121 comes into contact with the engine-side plate 111. At this time, the point of contact corresponds to the touch point of the clutch, and the power of the engine can be transmitted after the touch point. A more detailed form in which the clutch set 100 is pressed to determine the touch point will now be described with reference to FIGS. 3A and 3B.

The connection unit 200 includes a rack 220 for contacting the pinion 310 of the motor 300 to change the rotational motion of the motor 300 into linear motion and outputting the linear motion, A connecting bar 210 which contacts the transmission side plate 112 to transmit the elastic force of at least one of the output torque of the motor 300 and the clutch return spring 131 and the clutch cushion spring 132, And a support shaft 230 for supporting the connection bar 210 such that it can be diffracted.

One side of the connecting bar 210 is in contact with the transmission side plate 112 of the clutch set 100 and the other side of the connecting bar 210 is hinged to be diffractable according to the movement of the rack 220.

The supporting shaft 230 is provided in a fixed state and the connecting bar 210 is kept in contact with the supporting shaft 230.

One side of the rack 220 is hinged to the connecting bar 210 and the other side is in contact with the pinion 310 of the motor 300. Teeth that can be engaged with the pinion 310 of the motor 300 may be formed at a portion of the motor 300 that contacts the pinion 310. The rotation of the pinion 310 of the motor 300 The rack 220 can be converted into a vertical motion of the same size.

The rotational force of the motor 300 may be changed to a normal force by the rack 220 so that the force can be applied to the right side of FIG. 2. The connecting bar 210, Side plate 230 to press the transmission-side plate 112 in the direction opposite to the elastic force of the clutch-set 100. [0064] That is, the output torque of the motor 300 and the elastic force of the clutch return spring 131 and the clutch cushion spring 132 of the clutch set 100 act in opposite directions to each other. As described above, When the value is supplied to the motor 300, the clutch set 100 and the motor 300 can be kept stationary according to the balance of forces.

Hereinafter, changes in the clutch set 100 when the force is transmitted due to the rotation of the motor 300 will be described with reference to FIGS. 3A and 3B.

3A shows a state in which the engine side plate 111 and the first friction material 121 are spaced apart by a distance a and the transmission side plate 112 and the second friction material 122 are spaced apart from each other by a distance b have. Fig. 3A shows a state in which the friction between the friction material and the plate is not in contact with each other, so that the power of the engine is not transmitted, that is, the clutch is released. In this case, since the transmission side plate 112 is not in contact with the second friction material 122, only the elastic force of the clutch return spring 131 acts and the elastic force of the clutch cushion spring 132 is maintained at zero .

As described above, when the touch point learning logic is executed, the controller 500 provides the motor 300 with a current having a constant threshold current value. Here, the critical current value may be defined as a current value for outputting an output torque of a magnitude that can stop the rotation of the motor 300 by supporting the force transmitted by the elastic force of the clutch set 100.

Thereafter, the control unit 500 gradually increases the current to be supplied to the motor 300. As the output torque of the motor 300 increases, the connecting portion 200 presses the transmission side plate 112 with a greater force , And the intervals a and b can be gradually reduced.

Since the magnitude of the elastic force is increased in proportion to the magnitude of the compression of the elastic member according to the general principle of the elastic force, the magnitude of the critical current value may increase as the elastic member provided in the clutch set 100 is compressed. Can supply a current of a critical current value through feedback control using a Hall signal.

As the output torque of the motor 300 increases and the connecting bar 210 presses the transmission side plate 112 to a larger size, the intervals a and b gradually decrease, and at a specific moment, , The engine side plate 111 and the first friction material 121 come into contact with each other and the transmission side plate 112 and the second friction material 122 come into contact with each other and this point corresponds to the touch point of the clutch. That is, as the friction occurs, the power of the engine starts to be transmitted.

4A shows the relationship between the movement of the transmission side plate 112 by the increase of the output torque of the motor 300 in the clutch set 100 and the magnitude of the elastic force generated thereby.

Since the gap a between the engine side plate 111 and the first friction material 121 and the gap b between the transmission side plate 112 and the second friction material 122 are spaced apart from each other before the point of time of the touch point, Only the elastic force Kr by the spring 131 acts. At this time, as the distance between the transmission side plate 112 and the engine side plate 111 decreases (x increases), the elastic force increases in proportion thereto.

Thereafter, when the touch points, that is, the intervals a and b become 0, an elastic force is generated by the clutch cushion spring 132 provided between the first friction material 121 and the second friction material 122, As described above, the elastic force suddenly rises from the touch point (time point when a + b = 0).

4B shows the relationship between the movement of the transmission side plate 112 and the magnitude of the critical current value supplied by the motor 300. Fig.

As described above, the threshold current value is a current value for keeping the motor 300 in a stopped state. In order for the motor 300 to be kept in the stopped state, the output torque of the motor 300 is set to the opposite direction It is required to be the same size as the force due to the elastic force of the elastic member 100. In addition, since the current supplied to the motor 300 by the control unit 500 is proportional to the output torque of the motor 300, the slope of the current supplied by the motor 300 from the touch point to the start point suddenly .

The control unit 500 can determine the time point at which the slope of the threshold current value changes and decide the point of time as the touch point of the clutch set 100. That is, the critical current value is supplied to the motor 300 arbitrarily while the engine is turned off, and the threshold current value is gradually increased while maintaining the motor 300 in a stopped state in accordance with the feedback control using the hall signal of the Hall sensor 400 So that the point of time at which the inclination changes can be determined as the touch point.

According to the present invention described above, even when the engine is turned off and the vehicle is not running, i.e., in a state where the state on the powertrain side such as the engine torque, the engine speed, And the touch point can be learned by the change of the supply current.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, 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 appended claims.

100: Clutch set
111: Engine side plate
112: Transmission side plate
121: First friction material
122: second friction material
131: clutch return spring
132: clutch cushion spring
200: Connection
210: Connection bar
220: Rack
230: Support shaft
300: motor
310: pinion
400: Hall sensor
500:

Claims (6)

In a touch point learning apparatus,
A clutch set including two elastic members;
A motor for outputting an output torque proportional to an input current;
A connecting portion for pressing the clutch set in a direction opposite to the elastic force of the elastic member of the clutch set in accordance with the output torque of the motor; And
And a control unit for supplying an electric current to the motor to control an output torque of the motor,
The clutch set includes:
An engine side plate and a transmission side plate arranged in parallel;
A first friction material and a second friction material provided in parallel between the engine side plate and the transmission side plate; And
A clutch return spring for elastically supporting the engine side plate and the transmission side plate, and a clutch cushion spring for elastically supporting the first friction material and the second friction material,
Wherein,
Wherein the motor is provided with a current of a critical current value corresponding to an output torque of a magnitude capable of stopping rotation of the motor by supporting a force transmitted by an elastic force of the clutch set, And the clutch set is pressed through the connecting portion to learn the touch point of the clutch set based on a change in the threshold current value for stopping the rotation of the motor
Touchpoint learning device.
The method according to claim 1,
Wherein,
And determines a point of time at which the slope of the threshold current value changes as a touch point of the clutch set
Touchpoint learning device.
delete The method according to claim 1,
The critical current value increases as the gap between the engine side plate and the first friction material and the gap between the transmission side plate and the second friction material decrease,
And a slope of the critical current value is changed when the engine side plate and the first friction material come into contact with each other and the transmission side plate and the second friction material come into contact with each other.
Touchpoint learning device.
5. The method of claim 4,
The connecting portion
A rack for contacting with a pinion of the motor to change a rotational motion of the motor into a rectilinear motion and outputting the rectilinear motion; And
And a connecting bar connected to the rack and brought into contact with the transmission side plate to transmit an elastic force of at least one of the output torque of the motor and the clutch return spring and the clutch cushion spring
Touchpoint learning device.
The method according to claim 1,
The motor is a BLDC (Brushless Direct Current) motor,
Further comprising a hall sensor for sensing the rotation of the motor,
Wherein,
Wherein the controller senses whether or not the motor is stopped by receiving the sensed value of the hall sensor
Touchpoint learning device.

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