KR20140083487A - Electronic parking brake system - Google Patents

Abstract

The present invention discloses an electronic parking system. The present invention relates to an electric motor comprising a motor, a decelerator connected to the electric motor, for decelerating and transmitting a driving force of the electric motor, and a control unit connected to the decelerator and disposed on at least one surface of the disc, A temperature measuring sensor unit for measuring a temperature of the disk; a control unit for controlling the electric motor to perform a clamping operation electrically connected to the electric motor to perform a clamping operation for adjusting a gap between the pad and the disk; And a control unit for controlling the electric motor to perform a reclamping operation of adjusting the interval between the disk and the pad based on the initial temperature of the disk measured by the temperature measurement sensor unit after performing the clamping operation do.

Description

Electronic parking brake system

The present invention relates to a system, and more particularly, to an electronic parking system.

Generally, when parking is performed for a vehicle, a parking system may be provided to limit the movement of the vehicle when parking. Such a parking system can be formed in various forms. For example, in the case of a parking system, a separate parking brake is provided to restrain rear wheels or front wheels, or a method of restricting rear wheels or front wheels through a caliper module basically provided for braking. At this time, a method of restricting the rear wheel or the front wheel through the basically provided caliper module may be variously used. Among them, an electronic parking system (EPB system, electronic parking brake system) may be used.

On the other hand, such an electronic parking system can be used in conjunction with a key off apply. Specifically, the key off application is a function that automatically activates the electronic parking system according to the signal of the vehicle key when the start of the vehicle is turned off, so that it is widely used for the safety of the vehicle. In this case, the electronic parking system generally operates by contacting the caliper pad and the disk, but the durability is deteriorated and frequent noise and vibration frequently occur due to frequent operation.

Embodiments of the present invention provide an electronic parking system that performs reclamping according to an initial temperature of a disk.

According to an aspect of the present invention, there is provided an electric motor comprising: an electric motor; a decelerator connected to the electric motor for decelerating and transmitting a driving force of the electric motor; A temperature measuring sensor unit for measuring a temperature of the disk, and a controller for controlling the electric motor so as to perform a clamping operation, which is electrically connected to the electric motor and adjusts an interval between the pad and the disk, And performing a reclamping operation of performing a reclamping operation in which the interval between the disk and the pad is adjusted again based on the initial temperature of the disk measured by the temperature measurement sensor unit after the clamping operation is performed, And an electronic parking system including a control unit for controlling the electronic parking system.

Also, a plurality of temperature intervals for the initial temperature may be set, and the reclamping operations may be different from each other depending on the corresponding initial temperature.

Also, the reclamping operation may be set to a different number of times according to each temperature interval.

Also, the reclamping operation formed according to each temperature interval may be tabulated and stored in the controller.

In addition, the controller may control the electric motor so as to narrow the gap between the disk and the pad at least once during the reclamping operation.

In addition, the control unit may control the electric motor to vary the clamping force between the disk and the pad at least once in the reclamping operation.

The control unit may control the electric motor to vary the clamping force between the disk and the pad based on the inclination of the vehicle.

In addition, the time at which the reclamping operation is started may be set differently according to the initial temperature of the disc.

Also, the first gap between the disc and the pad initially set may be set different from the second gap between the disc and the pad at the time of performing the reclipping action.

In addition, the second interval may be set to be smaller than the first interval.

Embodiments of the present invention can compensate for the initial clamping force according to the initial temperature of the disc, thereby preventing the clamping force due to the contraction of the pad and the disc from being reduced over time. Further, the embodiments of the present invention can improve the safety and convenience of the vehicle by compensating the clamping force through the reclamping operation.

1 is a conceptual diagram showing an electronic parking system according to an embodiment of the present invention.
2 is a flowchart showing a control procedure of the electronic parking system shown in FIG.
FIG. 3 is a graph showing time and clamping force when performing reclamping of the electronic parking system shown in FIG. 1; FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions. The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

1 is a conceptual diagram showing an electronic parking system 100 according to an embodiment of the present invention. 2 is a flowchart showing a control procedure of the electronic parking system 100 shown in FIG. 3 is a graph showing time and clamping force when performing reclamping of the electronic parking system 100 shown in Fig.

1 to 3, the electronic parking system 100 may include an electric motor 110. At this time, the electric motor 110 may operate to provide a clamping force. The electronic parking system 100 may include a decelerator 120 connected to the electric motor 110 and decelerating the driving force of the electric motor 110 to transmit the decelerated electric power. The deceleration unit 120 includes a driving gear 121 connected to the electric motor 110, a wheel gear 122 connected to the driving gear 121, a ring gear 123 connected to the wheel gear 122, A planetary gear 125 that is inserted into the ring gear 123, an output sun gear 126 that is connected to the fixed sun gear 124 and the planetary gear 125. The reduction portion 120 may include a thrust bearing 127 connected to the output sun gear 126 and a linear motion portion 128 connected to the thrust bearing 127. [

Meanwhile, the electronic parking system 100 may include a pad 130 that operates in conjunction with the deceleration unit 120. In addition, the electronic parking system 100 may include a disk 140 that is selectively in contact with or separated from the pad 130. At this time, a plurality of pads 130 may be provided, and a disk 140 may be disposed between the plurality of pads 130 to be contacted or separated according to the operation of the electric motor 110.

The electronic parking system 100 may include a temperature measurement sensor unit 150 for measuring the temperature of the disk 140. [ At this time, the temperature measurement sensor unit 150 may measure the temperature of the disk 140 in real time or measure the initial temperature of the disk 140 and transmit the measured temperature to the controller 160, which will be described later.

The electronic parking system 100 is electrically connected to the electric motor 110 and is connected between the disk 140 and the pad 130 based on the initial temperature of the disk 140 measured from the temperature measurement sensor unit 150. [ And a control unit 160 for controlling the electric motor 110 to perform a reclamping operation for adjusting the interval of the electric motor 110. [

The control unit 160 may control the electric motor 110 to perform a clamping operation for initially adjusting the interval between the pad 130 and the disk 140. [ At this time, the control unit 160 controls the clamping operation of the clamping unit 150 to adjust the gap between the disc 140 and the pad 130 based on the initial temperature of the disc 140 measured by the temperature measuring sensor unit 150 To control the electric motor 110 to perform the reclamping operation.

Hereinafter, the electronic parking system 100 will be described in detail.

The electronic parking system 100 may operate when the vehicle is not moving, such as when the vehicle is stopped or when the vehicle is parked. Specifically, when the electronic parking system 100 is operating, the controller 160 can determine the initial temperature of the disk 140.

For example, when the electronic parking system 100 operates, the temperature measurement sensor unit 150 may measure the initial temperature of the disk 140 and transmit the measured temperature to the controller 160. At this time, the controller 160 may control the electric motor 110 to maintain the interval between the disk 140 and the pad 130 at a predetermined interval. In particular, the controller 160 may control the electric motor 110 so that a clamping force is generated to maintain the gap between the disk 140 and the pad 130 at predetermined intervals.

When controlled as described above, the pad 130 may contact the disc 140 to form an initial clamping force. At this time, the pad 130 and the disk 140 may contact each other to maintain an initial clamping force.

In this case, however, the pad 130 and the disk 140 may be in contact with each other a plurality of times according to operation of the vehicle, and may be separated from each other, so that the initial temperature of the disk 140 may be increased. At this time, as time passes, the initial temperature of the disk 140 is continuously decreased, and the disk 140 and the pad 130 may not maintain the initial clamping force. That is, the disk 140 and the pad 130 are contracted due to the lowering of the temperature, and the interval between the disk 140 and the pad 130 becomes longer than the initial interval, thereby losing the initial clamping force.

If the initial clamping force is lost as described above, the vehicle may not stop and may move. Accordingly, the control unit 160 may control the electric motor 110 to perform a reclamping operation to recover the initial clamping force to prevent the above-described case.

The control unit 160 may calculate the interval between the disk 140 and the pad 130 necessary for the reclamping operation based on the initial temperature of the disk 140 measured by the temperature measurement sensor unit 150. [

For example, the control unit 160 may set a plurality of temperature intervals for the temperature of the disk 140. For example, That is, the controller 160 can determine which of the plurality of temperature sections the initial temperature of the disk 140 corresponds to.

At this time, a plurality of temperature sections may be formed in various ways. For example, the plurality of temperature sections may be set to the first temperature section and the second temperature section, and the plurality of temperature sections may be formed from the first temperature section to the nth temperature section (where n is a natural number). Hereinafter, for convenience of explanation, the case where n is 3 will be described in detail.

Specifically, the first temperature interval is a temperature interval during which the reclamping operation is not required, the second temperature interval is a temperature interval during which the reclamping operation is required once, and the third temperature interval is set to a temperature interval during which the reclining operation is required twice .

In this case, the control unit 160 may set the time at which the reclining operation is performed. For example, at the second temperature interval, the time at which the reclamping operation is performed once may be set at a time point at which the first time t1 has elapsed from the beginning. In the second temperature interval, the time at which the reclamping operation is first performed is set to the time point at which the first time (t1) elapses from the beginning, and the time at which the recloning operation is performed second time is from the beginning to the second time (t2) It can be set to the time point at which it has elapsed. At this time, the time point at which the reclamping operation is performed is not limited to the above, and it is also possible to set the elapsed time until the next reclamping operation is performed after each reclamping operation. Hereinafter, for convenience of explanation, the first reclamping operation is performed when the first time t1 elapses, and the second reclapping operation is performed when the second time t2 has elapsed Will be described in detail.

Meanwhile, the time at which the reclamping operation is performed and the number of times at which the reclosing operation is performed may be tabulated and stored in the controller 160.

The control unit 160 may determine whether the initial temperature of the disk 140 corresponds to a certain temperature range in operation S110. It is possible to control the electric motor 110 to maintain the initial clamping force. At this time, the interval between the pad 130 and the disk 140 can maintain the first interval. In addition, the first temperature range may range from room temperature to within the first temperature (refer to FIG. 3 (a)).

If the control unit 160 controls the electric motor 110 as described above, the control unit 160 may determine whether the vehicle speed is less than a predetermined vehicle speed (step S120). At this time, If it is determined that the vehicle speed is less than the set vehicle speed, it can be determined that the vehicle has stopped or parked. On the other hand, if the vehicle speed is equal to or greater than the preset vehicle speed, it is determined that the vehicle is running and the electronic parking system 100 is not operated.

If it is determined that the vehicle speed is less than the predetermined vehicle speed, the control unit 160 can determine whether the vehicle parking position is in the IGN Off state by operating the electronic parking system 100 again (step S130). , It is determined that the vehicle is in operation and the electronic parking system 100 is not operated. On the other hand, if both of them are satisfied, the controller 160 determines that the vehicle is stopped or the vehicle is parked, and the degree of inclination of the vehicle can be determined again.

At this time, the control unit 160 can set the clamping force between the pad 130 and the disc 140 according to the degree of inclination of the vehicle. At this time, the clamping force between the pad 130 and the disk 140 may be set differently according to the inclination angle of the vehicle, and may be preset in the controller 160 as tabulated state.

For example, when the inclination of the vehicle is 5 degrees, the clamping force can be set to be the first clamping force, and when the inclination of the vehicle is 10 degrees, the clamping force can be set to be the second clamping force.

As described above, the control unit 160 can determine the initial clamping force based on the initial temperature of the disc 140, the vehicle speed, and the inclination of the vehicle. At this time, the control unit 160 can prevent the vehicle from moving by keeping the initial clamping force as it is (step S140)

If the initial temperature of the disk 140 measured by the temperature measurement sensor unit 150 is in the second temperature range, the controller 160 may control the electric motor 110 in a different manner from the initial temperature of the disk 140. In operation S110, In this case, the second temperature range may range from the first temperature to the second temperature. In particular, the second temperature may be set to be higher than the first temperature (refer to FIG. 3 (b)).

When the initial temperature of the disk 140 is within the second temperature range, the controller 160 may calculate the initial clamping force. At this time, the control unit 160 may determine whether the vehicle is in operation by detecting whether the vehicle is in operation (S120), whether the electronic parking system 100 is operating or not,

If the controller 160 determines that the vehicle is stopped or is parked, the controller 160 can determine the degree of inclination of the vehicle. At this time, the initial clamping force, the clamping force required for the clamping operation, the number of times of clamping operation, and the clamping operation time can be calculated according to the degree of inclination of the vehicle (step S140)

Specifically, the control unit 160 stores a value of the reclamping force, a number of reclipping operations, and a reclipping operation time according to the initial temperature of the disc 140 according to the angle of the vehicle, Lt; / RTI >

For example, when the initial temperature of the disk 140 corresponds to the second temperature range, the control unit 160 may set the number of times of reclamping operation to 1 and the time of recycling to a first time t1. Also, the control unit 160 can set the initial clamping force and the reclining force required for the reclamping operation, respectively, according to the degree of inclination of the vehicle.

When the setting is completed as described above, the controller 160 may control the electric motor 110 such that the interval between the pad 130 and the disk 140 is set to the first interval so that the initial clamping force is established. The control unit 160 controls the electric motor 150 so that the interval between the pad 130 and the disk 140 becomes the second interval so that the recirculating force is applied after the first time t1 elapses from the initial time when the initial clamping force is applied. 110). At this time, the first interval may be set to be larger than the second interval.

If the initial temperature of the disk 140 measured by the temperature measurement sensor unit 150 is in the third temperature range, the controller 160 may control the electric motor 110 in a different manner from the initial temperature of the disk 140. In operation S110, At this time, the third temperature range may be within the range from the second temperature to the third temperature, and may be set to a case where the second temperature is exceeded. In particular, the third temperature may be set to be higher than the second temperature (refer to (c) of FIG. 3)

If the initial temperature of the disk 140 is within the third temperature range, the controller 160 may calculate the initial clamping force. At this time, the control unit 160 may determine whether the vehicle is in operation by detecting whether the vehicle is in operation (S120), whether the electronic parking system 100 is operating or not,

If the controller 160 determines that the vehicle is stopped or is parked, the controller 160 can determine the degree of inclination of the vehicle. At this time, the initial clamping force, the clamping force required for the clamping operation, the number of times of clamping operation, and the clamping operation time can be calculated according to the degree of inclination of the vehicle (step S140)

Specifically, the control unit 160 stores a value of the reclamping force, a number of reclipping operations, and a reclipping operation time according to the initial temperature of the disc 140 according to the angle of the vehicle, Lt; / RTI >

For example, when the initial temperature of the disk 140 corresponds to the third temperature interval, the control unit 160 determines that the number of times of reclamping operation is 2, the time period of the reclining operation is the first time t1 and the second time t2 ). Also, the control unit 160 can set the initial clamping force and the reclining force required for the reclamping operation, respectively, according to the degree of inclination of the vehicle.

When the setting is completed as described above, the controller 160 may control the electric motor 110 such that the interval between the pad 130 and the disk 140 is set to the first interval so that the initial clamping force is established. The control unit 160 controls the clutch 140 such that the gap between the pad 130 and the disk 140 is a second interval such that the first recirculating force is applied after the first time t1 elapses from the initial time when the initial clamping force is applied, The motor 110 can be controlled. The control unit 160 controls the interval between the pad 130 and the disc 140 such that the second clamping force is applied after the second time t2 elapses from the initial time when the initial clamping force is applied after the first clamping force is applied The electric motor 110 can be controlled to have a third interval. In this case, the first interval may be set to be larger than the second interval, and the second interval may be set to be larger than the third interval. Also, the second interval may be set equal to the third interval.

Accordingly, the electronic parking system 100 can compensate for the reduction of the clamping force due to heat shrinkage of the pad 130 and the disk 140 through the reclamping operation.

In particular, in the case of the electronic parking system 100 according to the embodiments of the present invention, at least one of the second interval and the third interval may be adjusted to prevent the vehicle from moving by performing a reclamping operation. For example, in the case of the conventional electronic parking system 100, the pad 130 and the disk 140 can thermally expand due to the friction between the pad 130 and the disk 140 according to the driving of the vehicle. At this time, in the case of the pad 130 and the disk 140, the movement of the vehicle can be initially restrained when the initial clamping force is applied. However, when the temperature of the pad 130 and the disk 140 is lowered with the lapse of time, the interval between the pad 130 and the disk 140 may be reduced due to the contraction of the pad 130 and the disk 140. At this time, since the initial clamping force is not variable depending on the temperature, the clamping force between the pad 130 and the disk 140 is reduced, and the vehicle can move away from the constraint. In particular, when the vehicle is parked on a sloping ground or stopped for a long period of time, when the electronic parking system 100 operates as described above, the vehicle may move along an inclined direction, which may cause a safety problem.

However, in the case of the electronic parking system 100 according to the embodiments of the present invention, the initial clamping force is continuously compensated according to the thermal expansion of the pad 130 and the disk 140, .

Accordingly, the electronic parking system 100 can compensate the initial clamping force according to the initial temperature of the disk 140, thereby preventing the clamping force due to the contraction of the pad 130 and the disk 140 from being reduced over time have. Also, the electronic parking system 100 can improve the safety and convenience of the vehicle by compensating the clamping force through the reclamping operation.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover all such modifications and variations as fall within the true spirit of the invention.

100: Electronic parking system
110: Electric motor
120:
121: drive gear
122: wheel gear
123: ring gear
124: Fixed sun gear
125: planetary gear
126: Output sun gear
127: Thrust bearing
128: linear motion part
130: Pad
140: disk
150: Temperature measurement sensor section
160:

Claims (10)

Electric motor;
A deceleration unit connected to the electric motor for decelerating and transmitting the driving force of the electric motor;
A pad connected to the decelerator and disposed on at least one surface of the disc and selectively in contact with the disc;
A temperature measurement sensor unit for measuring a temperature of the disk; And
Wherein the control unit controls the electric motor to perform a clamping operation that is electrically connected to the electric motor to adjust a gap between the pad and the disk, And a controller for controlling the electric motor to perform a reclamping operation for re-adjusting an interval between the disk and the pad based on the initial temperature. The method according to claim 1,
Wherein a plurality of temperature intervals for the initial temperature are set and the reclamping operations are formed differently according to the respective temperature intervals corresponding to the initial temperatures. 3. The method of claim 2,
Wherein the reclamping operation is set to a different number of times according to each temperature interval. 3. The method of claim 2,
Wherein the reclamping operation formed in accordance with each temperature interval is tabulated and stored in the controller. The method according to claim 1,
Wherein the controller controls the electric motor so as to narrow the gap between the disk and the pad at least once during the reclamping operation. The method according to claim 1,
Wherein the controller controls the electric motor to vary the clamping force between the disk and the pad at least once in the reclamping operation. The method according to claim 1,
Wherein the control unit controls the electric motor so as to vary the clamping force between the disk and the pad based on the inclination of the vehicle. The method according to claim 1,
Wherein a time at which the reclamping operation is started is set differently according to an initial temperature of the disk. The method according to claim 1,
Wherein the first gap between the disc and the pad initially set is set different from the second gap between the disc and the pad at the time of performing the reclipping action. 10. The method of claim 9,
And the second interval is set to be smaller than the first interval.

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