KR20120025699A - Electronic parking brake system and method of controlling the same - Google Patents

Electronic parking brake system and method of controlling the same Download PDF

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Publication number
KR20120025699A
KR20120025699A KR1020100087749A KR20100087749A KR20120025699A KR 20120025699 A KR20120025699 A KR 20120025699A KR 1020100087749 A KR1020100087749 A KR 1020100087749A KR 20100087749 A KR20100087749 A KR 20100087749A KR 20120025699 A KR20120025699 A KR 20120025699A
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KR
South Korea
Prior art keywords
parking brake
motor
electronic
electronic parking
determination counter
Prior art date
Application number
KR1020100087749A
Other languages
Korean (ko)
Inventor
이찬희
Original Assignee
주식회사 만도
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 만도 filed Critical 주식회사 만도
Priority to KR1020100087749A priority Critical patent/KR20120025699A/en
Publication of KR20120025699A publication Critical patent/KR20120025699A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/81—Braking systems

Abstract

The present invention provides a parking switch which is operated by a driver to instruct braking of a vehicle; An electronic parking brake apparatus having a motor for generating braking force of the vehicle; If the parking switch is remanufactured within a certain time, the fault determination counter negatively calculates a certain number.If the parking switch is remanaged after a certain time, the fault determination counter is positively counted, and the calculated fault determination counter is zero. And an electronic control unit for prohibiting the driving of the motor when the failure determination counter is zero.
The present invention determines that an overload has occurred in a motor provided in the electronic parking brake device when the number of operations of the parking switch for operating and releasing the electronic parking brake device is greater than or equal to the number of failure determination, thereby effectively detecting the failure of the electronic parking brake system. It is possible to increase the stability and safety of the vehicle, and to improve the reliability of the failure detection of the electronic parking brake system.
In addition, when the motor provided in the electronic parking brake device is overloaded, the operation of the electronic parking brake device is prohibited, thereby protecting the electronic parking brake system safely.

Description

Electronic parking brake system and method of controlling the same

The present invention relates to an electronic parking brake system and a control method thereof, and more particularly, to an electronic parking brake system and a control method for preventing a failure of the electronic parking brake device.

The brake device is a device that decelerates and stops a running vehicle and maintains a stopped state at the same time. The brake device includes a parking brake that decelerates and stops a running vehicle and keeps the vehicle in a stopped state.

The parking brake allows the parking cable to be pulled by the operation of the lever provided on one side of the driver's seat inside the vehicle, and provides the braking force to the wheels connected to the parking cable to keep the wheels at a standstill. This releases the braking force provided to the wheels. In this way, an operation method of the parking brake that provides or releases the braking force to the wheel by using the tension of the parking cable is called a cable puller type.

The cable puller-type parking brake has been very troublesome because the lever must be operated at each parking or driving start according to the driver's will. Accordingly, an electronic parking brake (EPB) system has been developed in which the parking brake is automatically operated by a motor according to the operating state of the vehicle.

Electronic Parking Brake (EPB) maintains the manual parking brake (Cable Puller System) while driving a separate actuator equipped with a motor when the parking switch is operated to pull the cable connected to the parking brake. Activate the parking brake. Accordingly, even if the driver does not operate the parking brake manually, the parking brake is automatically applied or released through a simple switch operation.

In such an electronic parking brake system, if the driver repeats the operation and release of the parking brake in a short time, the motor may be overloaded, causing a failure of the electronic parking brake system.

The electronic parking brake system judged the failure by detecting the temperature generated by the motor through a temperature sensor and determining the overload of the motor according to the detected motor temperature. As a result, manufacturing costs of the electronic parking brake system have been increased.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide an electronic parking brake system and a control method for determining that the motor is overloaded if the number of times of repeatedly operating and releasing the electronic parking brake device is greater than or equal to the number of failure determinations. .

Another object of the present invention is to provide an electronic parking brake system and a method of controlling the same, which enables the electronic parking brake apparatus to operate after a reference time has elapsed when the motor provided in the electronic parking brake apparatus is overloaded.

An electronic parking brake system according to an aspect of the present invention includes a parking switch operated by a driver to instruct braking of a vehicle; An electronic parking brake apparatus having a motor for generating braking force of the vehicle; If the parking switch is re-operated within a certain time, the fault determination counter will negatively calculate a certain number.If the parking switch is re-operated after a certain time, the fault determination counter will be positively calculated by the fault determination counter, and the calculated fault determination counter is zero. And an electronic control unit for prohibiting the driving of the motor when the failure determination counter is zero.

The electronic control unit of the electronic parking brake system controls the driving of the motor when an operation signal for releasing braking of the vehicle is input from the parking switch when the driving of the motor is prohibited.

The electronic control unit of the electronic parking brake system releases the driving prohibition of the motor when the preset reference time elapses.

The electronic parking brake system further includes a display unit indicating a failure of the electronic parking brake device when the driving of the motor is prohibited.

In a control method of an electronic parking brake system including a parking switch operated by a driver instructing braking of a vehicle according to an aspect of the present invention and an electronic parking brake apparatus having a motor for generating braking force of the vehicle, the parking switch operates. If the parking switch is remanufactured within a certain time, minus a certain number at the fault determination counter. If the fault determination counter is zero, the operation of the motor is prohibited.

The control method of the electronic parking brake system further includes releasing the prohibition of driving the motor when a preset reference time elapses.

The control method of the electronic parking brake system further includes determining that the overload of the motor occurs when the failure determination counter is zero, determining that the electronic parking brake device is broken due to the overload occurrence of the motor, and indicating a failure of the electronic parking brake device. do.

In the control method of the electronic parking brake system, when an operation signal for releasing braking of the vehicle is input from the parking switch when the motor is prohibited from driving, the braking force is released by driving the motor.

The present invention determines that an overload has occurred in a motor provided in the electronic parking brake device when the number of operations of the parking switch for operating and releasing the electronic parking brake device is greater than or equal to the number of failure determination, thereby effectively detecting the failure of the electronic parking brake system. It is possible to increase the stability and safety of the vehicle, and to improve the reliability of the failure detection of the electronic parking brake system.

In addition, when the motor provided in the electronic parking brake device is overloaded, the operation of the electronic parking brake device is prohibited, thereby protecting the electronic parking brake system safely.

In addition, when it is determined that a failure occurs in the electronic parking brake system, the driver may be warned to prevent occurrence of an accident due to the electronic parking brake system.

In addition, it is possible to reduce the manufacturing cost of the electronic parking brake system by determining the overload state of the motor provided in the electronic parking brake device without using a temperature sensor, and to accurately detect the overload of the motor even in a low temperature or high temperature condition.

1 is an exemplary view of an electronic parking brake apparatus according to an embodiment of the present invention.
2 is a block diagram of an electronic parking brake system according to an embodiment of the present invention.
3 is a control flowchart of an electronic parking brake system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating an electronic parking brake system according to an embodiment of the present invention, which shows a cable plug type electronic parking brake, and FIG. 2 is a diagram of an electronic parking brake system for controlling the electronic parking brake device shown in FIG. 1. It is a block diagram.

The electronic parking brake device shown in FIG. 1 is a cable plug type electronic parking brake device. The cable plug type electronic parking brake device includes a motor 10, a gear train 20, a nut member 25, a spindle 30, and parking. It includes a cable 40, the elastic member 50, the cable plug type electronic parking brake device is provided adjacent to the elastic member 50, the braking force detection unit for detecting the tension of the parking cable 40 when the electronic parking brake device is operated. (D) is further included.

The electronic parking brake system shown in FIG. 2 includes a cable plug type electronic parking brake device 10, 20, 30, 40, and 50, a brake 60, a parking switch 70, an electronic control unit (ECU) 80, and a display unit. Including (90), it will be described in more detail as follows.

When the parking switch 70 is operated by the driver, the motor 10 receives the electric power from the battery (not shown) to operate the brake 60 by forward or reverse rotation. That is, the motor 10 provides a braking force to the brake 60 or releases the braking force.

The gear train 20 is driven by the rotation of the motor 10, and the plurality of gears are linearly reciprocated while rotating by being engaged with each other by a helical gear formed on an outer circumferential surface thereof. The gear train 20 includes a nut member 25 which is screwed with the spindle 30 and moves in a direction opposite to the direction of movement of the spindle 30.

The spindle 30 has a screw formed on the outer circumferential surface thereof, and the screw is screwed with the nut member 25 of the gear train 20 to rotate in the nut member 25 as the gear train 20 is driven. While moving linearly, the end of the spindle 30 is connected to the parking cable 40, the parking cable 40 is pulled or released in response to the linear movement of the spindle (30). At this time, when the spindle 30 moves, a reaction force corresponding to the movement force of the spindle 30 acts on the nut member 25 of the gear train 20.

The parking cable 40 is connected to the end of the spindle 30 to provide braking force to the brake 60 while being pulled or released in response to the movement of the spindle 30.

The elastic member 50 is compressed corresponding to the movement of the nut member 25 of the gear train 20. That is, the elastic member 50 is compressed in accordance with the movement of the nut member 25, but is compressed in response to the tension acting on the parking cable 40 in accordance with the movement of the spindle (30).

The brakes 60 are mounted on at least two wheels w, front, rear, left and right, and each brake 60 is connected to the spindle 30 through the parking cable 40, and the parking corresponds to the linear movement of the spindle 30. Tension of the cable 40 is transmitted to provide a braking force to the wheel w or to release the braking force provided to the wheel w.

The braking force detector D measures the tension acting on the parking cable 40. More specifically, the force against the movement force of the spindle 30 pulling the parking cable 40 when the motor 10 rotates acts on the nut member 25 so that the nut member 25 moves, and the nut member ( The elastic member 50 is compressed according to the moving force of 25. At this time, the braking force detector D detects the tension acting on the parking cable and transmits it to the electronic control unit 80.

Here, the tension is a force that the parking cable 40 is pulled or relaxed by the rotation of the nut member 25. When the tension is increased, the braking force is increased.

The braking force detection unit D has a hall sensor (not shown) having a fixed position and a magnet (not shown) whose position changes in response to the compression of the elastic member 50.

That is, when the elastic member 50 is compressed according to the movement of the nut member 25, the position of the magnet of the braking force detection unit D is also changed. When the distance between the hall sensor and the magnet is changed, the strength of the magnetic force detected by the hall sensor is changed. Is changed. At this time, the hall sensor transmits the detected strength of the magnetic force to the electronic control unit (80).

Accordingly, the electronic control unit 80 calculates the tension corresponding to the changed strength of the magnetic force of the Hall sensor (Hall IC), and measures the braking force of the brake 60 corresponding to the tension. Here, the tension of the parking cable 40 based on the correlation between the signal magnitude of the hall sensor and the amount of movement of the magnet is preset.

The parking switch 70 transmits the automatic parking mode signal to the electronic control unit 80 when the driver is turned on by the driver, and transmits the automatic parking release mode signal to the electronic control unit 80 when the driver is turned off by the driver. .

When the automatic parking mode signal is input from the parking switch 70, the electronic control unit 80 sets the automatic parking mode, and sets the automatic parking release mode when the automatic parking release mode signal is input from the parking switch 70.

The electronic control unit 80 transmits a driving command to the motor 10 in the parking setting mode so that the braking force is generated.

The electronic control unit 80 generates a current corresponding to the target braking force when the parking switch 70 is operated on in the normal operation state of the electronic parking brake device, and applies each generated wheel to the motor 10 by applying the generated current to the motor 10. To generate braking force.

The electronic control unit 80 calculates the tension of the parking cable 40 based on the data transmitted from the braking force detection unit D, and measures the braking force of the brake 60 based on the tension of the parking cable 40. By controlling the rotation of the motor 10 by comparing the measured braking force with the target braking force, the tension of the parking cable 40 and the braking force of the brake 70 are controlled.

The electronic control unit 80, when the parking switch 70 is operated, minus 1 at a preset failure determination counter, determines the reoperation of the parking switch 70 within a predetermined time, and the parking switch is operated within a predetermined time ( If 70) is re-operated, a negative number of 1 is negative from the fault determination counter, which is a certain number of 1, and then the negative number of 1 is further determined, the total failure determination counter is judged, and the determined total failure determination counter is zero (0). ) To determine the overload.

If the parking switch 70 is not re-operated within a predetermined time, the electronic control unit 80 adds a predetermined number 1 from the failure determination counter, in which the predetermined number 1 is negative, determines the total failure determination counter, and determines the determined total failure. It is determined whether the determination counter is zero (0) to determine the overload of the motor (10).

That is, the electronic control unit 80 determines that an overload has occurred in the motor 10 when the failure determination counter is zero, so that the operation of the electronic parking brake device is prohibited even when an operation signal is input from the parking switch 70. Then, when the reference time elapses, the control of the electronic parking brake device is released. The operation prohibition of the electronic parking brake device is to prohibit the driving of the motor 10.

Here, the fixed time is approximately 5 seconds and the failure determination counter is about 50 at most.

The electronic control unit 80 determines that the electronic parking brake system is operating normally when the failure determination counter is not zero.

The electronic control unit 80 controls the driving of the display unit 90 or the alarm unit (not shown) so that the driver can recognize the operation prohibition state of the electronic parking brake device.

The display unit 90 indicates whether the electronic parking brake system is broken by the driver, and visually notifies the driver of the failure of the electronic parking brake system by using an indicator light such as an LED.

In addition, by including an alarm unit (not shown) in the electronic parking brake system, it is also possible to inform the driver of the failure of the electronic parking brake system by a buzzer.

3 is a flowchart illustrating a control of an electronic parking brake system according to an exemplary embodiment of the present invention with reference to FIGS. 1 to 2.

First, the electronic parking brake system transmits an on operation signal to the electronic control unit 80 when the parking switch 70 is operated on by the driver and transmits an automatic parking release mode signal when the driver switches off by the driver. Send to 80.

In this way, when the parking switch 70 is operated 101, the electronic parking brake system calculates (102) a predetermined number 1 at the preset failure determination counter.

In addition, the electronic parking brake system determines 103 whether the parking switch 70 is reoperated within a predetermined time. At this time, if the parking switch 70 is re-operated within a certain time period, the number 104, which is a predetermined number, is further mined by the failure determination counter in which the predetermined number 1 is negative.

Then, the total failure determination counter is judged and the overload of the motor 10 is determined by determining 105 whether the total failure determination counter is zero (0).

At this time, if the total failure determination counter is zero (0), it is determined that the overload has occurred in the motor 10, and the operation of the electronic parking brake device is prohibited (106) even if an operation signal is input from the parking switch 70 later.

In addition, by displaying the operation prohibition state of the electronic parking brake device through the display unit 90 so that the driver can recognize, and outputs a warning sound through an alarm unit (not shown), the warning 106 of the failure of the electronic parking brake system.

When the reference time elapses after the operation is prohibited, the operation prohibition of the electronic parking brake device is released. The operation prohibition of the electronic parking brake device is to prohibit the driving of the motor 10.

On the other hand, if the parking switch 70 is not re-operated within a predetermined time, the electronic parking brake system calculates a certain number of pluses 107 from the fault determination counter having a negative number of 1 and determines the calculated total fault determination counter.

At this time, if the total failure determination counter is zero (0), it is determined that the overload has occurred in the motor 10, and the operation of the electronic parking brake device is prohibited (106) even if an operation signal is input from the parking switch 70 later.

In addition, by displaying the operation prohibition state of the electronic parking brake device through the display unit 90 so that the driver can recognize, and outputs a warning sound through an alarm unit (not shown), the warning 106 of the failure of the electronic parking brake system.

When the reference time elapses after the operation is prohibited, the operation prohibition of the electronic parking brake device is released. The operation prohibition of the electronic parking brake device is to prohibit the driving of the motor 10.

Here, the fixed time is approximately 5 seconds and the failure determination counter is about 50 at most.

As described above, the driver may be careful about the excessive operation of the electronic parking brake system by prohibiting the operation of the electronic parking brake system by determining the overload of the motor according to the operation of the parking switch and by notifying the driver.

This prevents over-operation of the electronic parking brake system, thereby improving the durability and extending the life of motors and components of the electronic parking brake system.

The electronic parking brake system determines that the electronic parking brake device is operating normally when the failure determination counter is not zero.

That is, when the parking switch 70 is turned on, the automatic parking mode is set, the motor 10 is rotated, and the spindle 30 is rotated through the gear train 20 by the rotation of the motor 10. As the spindle 30 moves, the parking cable 40 connected to the end of the spindle 30 is pulled out, and tension is generated in the parking cable 40.

In addition, the nut member 25 of the gear train 20 screwed to the spindle 30 has a movement force that is opposed to the direction of movement of the spindle 30, and is dependent on the movement force of the nut member 25 of the gear train 20. Accordingly, the elastic member 50 is compressed. According to the movement of the nut member 25 and the compression of the elastic member 50, the mark net provided in the braking force detection unit D moves, and the strength of the magnetic force detected through the hall sensor provided in the braking force detection unit D is changed. . Thus, the tension of the parking cable 40 is calculated based on the magnetic force detected by the hall sensor provided in the braking force detection unit D, and the braking force acting on the brake 60 based on the calculated tension of the parking cable 40 is calculated. Detect.

Next, the braking force of the detected brake 60 is compared with the target braking force. At this time, if the detected braking force of the brake 60 is equal to or greater than the target braking force, the rotation of the motor 10 is stopped, and the measured braking force of the brake 60 is the target. If the braking force is less than or equal to the braking force, the driving of the motor 10 is again controlled so that the detected braking force of the brake 60 becomes the target braking force.

10: motor 20: gear train
30: spindle 40: parking cable
50: elastic member 60: brake
70: parking switch 80: electronic control unit
90: display unit D: braking force detection unit

Claims (8)

A parking switch operated by a driver to instruct braking of the vehicle;
An electronic parking brake apparatus having a motor for generating braking force of the vehicle;
If the parking switch is re-operated within a predetermined time, the fault determination counter negatively calculates a certain number. If the parking switch is reoperated after the predetermined time elapses, the fault determination counter is positively computed by the fault determination counter, and the calculated fault determination is performed. And an electronic control unit for prohibiting the driving of the motor when the failure determination counter is zero by determining whether the counter is zero. The method of claim 1, wherein the electronic control unit,
And controlling the driving of the motor when an operation signal for releasing braking of the vehicle is input from the parking switch when the driving of the motor is prohibited. The method of claim 1, wherein the electronic control unit,
Electronic parking brake system for releasing the driving prohibition of the motor when a predetermined reference time elapses. The method of claim 1,
The electronic parking brake system further comprises a display unit indicating a failure of the electronic parking brake device when the driving of the motor is prohibited. In a control method of an electronic parking brake system including a parking switch operated by a driver to instruct braking of a vehicle and an electronic parking brake having a motor for generating braking force of the vehicle,
When the parking switch is operated, a certain number is negatively calculated at the failure determination counter,
If the parking switch is re-operated within a predetermined time, the failure determination counter minus a certain number, if the parking switch is re-operated after the predetermined time elapses, the failure determination counter plus a predetermined number,
And determining whether the calculated failure determination counter is zero, and if the failure determination counter is zero, prohibiting driving of the motor. The method of claim 5, wherein
The control method of the electronic parking brake system further comprises releasing the driving prohibition of the motor when a preset reference time elapses. The method of claim 5, wherein
If the failure determination counter is zero, it is determined that the overload of the motor occurs,
Determination of the failure of the electronic parking brake device according to the overload of the motor,
And controlling the failure of the electronic parking brake device. The method of claim 5, wherein
And controlling the electronic parking brake system to release the braking force when the operation signal for releasing the braking of the vehicle is input from the parking switch when the driving of the motor is prohibited.
KR1020100087749A 2010-09-08 2010-09-08 Electronic parking brake system and method of controlling the same KR20120025699A (en)

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KR1020100087749A KR20120025699A (en) 2010-09-08 2010-09-08 Electronic parking brake system and method of controlling the same

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Application Number Priority Date Filing Date Title
KR1020100087749A KR20120025699A (en) 2010-09-08 2010-09-08 Electronic parking brake system and method of controlling the same

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KR20120025699A true KR20120025699A (en) 2012-03-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101315775B1 (en) * 2012-04-04 2013-10-10 주식회사 만도 Electronic parking brake system and control method thereof
CN104709267A (en) * 2013-12-12 2015-06-17 株式会社万都 Electronic parking brake system and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101315775B1 (en) * 2012-04-04 2013-10-10 주식회사 만도 Electronic parking brake system and control method thereof
CN104709267A (en) * 2013-12-12 2015-06-17 株式会社万都 Electronic parking brake system and control method thereof

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