KR20130066386A - Fault diagnosis apparatus for cable disconnection of electronic parking brake system and method thereof - Google Patents

Fault diagnosis apparatus for cable disconnection of electronic parking brake system and method thereof Download PDF

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Publication number
KR20130066386A
KR20130066386A KR1020110133178A KR20110133178A KR20130066386A KR 20130066386 A KR20130066386 A KR 20130066386A KR 1020110133178 A KR1020110133178 A KR 1020110133178A KR 20110133178 A KR20110133178 A KR 20110133178A KR 20130066386 A KR20130066386 A KR 20130066386A
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KR
South Korea
Prior art keywords
cable
load value
motor
tension sensor
failure
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KR1020110133178A
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Korean (ko)
Inventor
김세호
Original Assignee
현대모비스 주식회사
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Priority to KR1020110133178A priority Critical patent/KR20130066386A/en
Publication of KR20130066386A publication Critical patent/KR20130066386A/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
    • B60T13/741—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 acting on an ultimate actuator
    • 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
    • B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

PURPOSE: A cable fault diagnosis device of an EPB(Electronic Parking Brake) system and a method thereof are provided to supply accurate information for maintenance by storing a warning lamp lighting and a fault code. CONSTITUTION: A cable fault diagnosis device of an EPB system comprises a tension sensor(15), a current measurement unit(14), a warning lamp(40), and a control unit(12). The tension sensor is installed in an EPB actuator and outputs a load value of a cable. The current measurement unit measures and outputs a driving current value of a motor(13). The warning lamp turns off when a cable fault is determined in the control unit. The control unit compares a motor driving current value and the load value inputted from the tension sensor and the current measurement unit to a predetermined load value. The control unit measures driving time of the motor in order to determine the fault of the cable. [Reference numerals] (12) Control unit; (13) Motor; (14) Current measurement unit; (15) Tension sensor; (40) Warning lamp

Description

Fault Diagnosis Apparatus for Cable Disconnection Of Electronic Parking Brake System And Method Thereof}

The present invention relates to an electronic parking brake system of a vehicle, and more particularly, to monitor a cable failure of an electronic parking brake system (EPB) system, and to warn a driver when a failure is detected to ensure safe driving. The present invention relates to an apparatus and method for diagnosing cable failure of an EPB system.

In general, an electronic parking brake (EPB) system pulls or releases a cable 20 using a motor embedded in the EPB actuator 10, as shown in FIG. It is a system to operate. The DIH brake 30 exhibits excellent parking performance in poor parking conditions such as a slope.

Figure 2 is an exemplary view briefly showing the internal configuration of the EPB actuator.

As shown in the figure, an electronic control unit (ECU) 11 includes a microcontroller (MCU) 11a for determining an operation state by identifying a user input and a state of a vehicle. According to the control, the operating speed and torque of the motor 13 can be adjusted. In general, the motor 13 uses a DC motor, and the electronic control unit 11 supplies about 10 A of current to drive the motor 13, and according to the load of the axle (eg, When parking on an uphill or downhill road, it is configured to carry a current capacity of up to 50A.

The electronic parking brake (EPB) is a parking button can be operated by a simple button operation instead of the user manual operation using a conventional parking brake, at least two seconds after setting to the automatic mode (Auto mode) when driving at ordinary roads By automatically operating the parking brake when the foot brakes are applied, the driver can keep the vehicle stationary without applying the foot brakes, thereby reducing the fatigue of the bridge when the city is in a traffic jam.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2010-0116782 'Failure diagnosis method of the electronic parking brake' (2010.11.02).

Vehicles equipped with such EPB systems are equipped with warning lights on the vehicle dashboard to alert the driver in case of EPB system failure.

Therefore, when the cable of the EPB system occurs through the tension sensor, a warning lamp is lit to warn the driver that the parking brake is not operating normally. There was a problem that could not determine which cable is broken.

The present invention was created to improve the above problems, the present invention monitors the motor drive current to detect the failure of the cable on the tension sensor side as well as the cable opposite the tension sensor, and when the failure is detected, the warning lamp lights up and stores the fault code The purpose of the present invention is to provide a device and method for diagnosing a cable failure of an EPB system that provides more accurate information for troubleshooting, and prompts a driver to take a quick action in case of a failure.

Cable failure diagnosis device of the EPB system according to an aspect of the present invention, the tension sensor is provided in the EPB actuator and measures the load value applied to the cable; A current measuring unit measuring and outputting a motor driving current value; And a controller for comparing a load value and a motor driving current value input from the tension sensor and the current measuring unit with a preset load value and a preset motor driving current value, and determining a cable failure by measuring a driving time of the motor. Characterized in that it comprises a.

In the present invention, when the input load value reaches the preset load value, the controller breaks the cable opposite the tension sensor when the input motor drive current value at the time of reaching is equal to or greater than the preset motor drive current value. If the input load value does not reach the preset load value, if the measured driving time of the motor exceeds the preset time, if there is no change in the load value, it is determined as a cable failure on the tension sensor side. Characterized in that.

The present invention, it characterized in that it further comprises a warning light that is turned on when it is determined that the cable failure in the control unit.

Cable failure diagnosis method of the EPB system according to an aspect of the present invention, the control unit receives a load value from the tension sensor after driving the motor according to the operation signal of the parking brake input; When the load value reaches a preset load value, receiving a motor driving current value at the reached time point; And determining, by the controller, whether a cable is broken by comparing a preset motor driving current value with the motor driving current value. Characterized in that it comprises a.

In the present invention, the determining of the failure of the cable may include determining that the cable is opposite to the tension sensor when the motor drive current value is greater than or equal to the preset motor drive current value.

In the present invention, the step of receiving a load value from the tension sensor, if the load value does not reach a predetermined load value, measuring the driving time of the motor, and the driving time of the motor exceeds a predetermined time If so, characterized in that it comprises the step of determining whether the load value changes.

In the present invention, the step of determining whether or not the change in the load value, if there is no change in the load value is determined as a cable failure of the tension sensor, if there is a change in the load value it is determined that the motor failure and the tension sensor failure It is done.

The present invention, if it is determined that the failure of the cable as a result of the cable failure, the step of lighting a warning light; And further comprising:

In the present invention, the preset motor driving current value is within 6A to 8A.

According to the present invention as described above, by monitoring the motor drive current to detect the failure of the cable on the tension sensor side as well as the cable on the opposite side of the tension sensor, when the failure is detected by saving the warning light and the trouble code for more accurate information for troubleshooting It can provide safe operation by warning the driver in case of trouble and taking quick action.

1 is a schematic view showing a general EPB system;
2 is an exemplary view briefly showing an internal configuration of a general EPB actuator;
3 is a block diagram showing a cable failure diagnosis apparatus of the EBP system according to an embodiment of the present invention;
4 is an exemplary view showing the interior of an EPB actuator according to an embodiment of the present invention;
5 is a waveform diagram of a cable failure detection of the tension sensor is mounted according to an embodiment of the present invention;
6 is a waveform diagram of a cable failure detection on the opposite side to which a tension sensor is mounted according to an embodiment of the present invention;
7 is a flowchart illustrating a cable failure diagnosis method of the EPB system according to an embodiment of the present invention.

Hereinafter, an embodiment of a cable failure diagnosis apparatus and method of an EPB system according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

3 is a block diagram showing a cable failure diagnosis apparatus of the EBP system according to an embodiment of the present invention, Figure 4 is an exemplary view showing the interior of the EPB actuator according to an embodiment of the present invention.

As can be seen with reference to Figures 3 to 4, the electronic parking brake (EPB) system is composed of a cable 20 for connecting the electronic parking brake (EPB) actuator 10 and the DIH brake 30, parking brake When the motor 13 is driven by the operation of the cable 20 to be pulled, the braking force is generated by operating the DIH brake 30.

Since the actual operating force is transmitted through the cable 20, the cable 20 connecting the EPB actuator 10 and the DIH brake 30 is disconnected or the connection part 31 of the DIH brake 30 is broken and the cable 20 is disconnected. In this case, the DIH brake 30 on the side where the failure occurs is not operated, and sufficient parking braking force cannot be secured by only one of the DIH brakes 30 being operated.

In addition, the EPB actuator 10 has a built-in micro-controller that determines the state of the user's input and the vehicle and determines the operation state in the ECU 11, so that the microcontroller has a PWM duty (electrical signal). duty) to adjust the operating speed and torque of the motor.

In addition, the vehicle equipped with the EPB system is equipped with a warning light on the dashboard of the vehicle so that the driver can be notified when the EPB system breaks down. Be warned that it is not operating normally.

According to the present invention, when the nut 17 of the cable 20a opposite the tension sensor is moved to the gear box 19 when the cable 20a opposite the tension sensor occurs, the cable 20b of the tension sensor is moved. Since the tension sensor 15 is normally outputted, the tension sensor 15 is able to discriminate even the failure of the cable 20a opposite the tension sensor, which was difficult to discriminate with the tension sensor 15 alone.

Therefore, the present invention monitors the motor drive current value to more accurately detect the failure of the cable 20.

Cable failure diagnosis apparatus of the EPB system according to an embodiment of the present invention, the tension sensor 15, the current measuring unit 14, the control unit 12 and the warning lamp 40.

The tension sensor 15 is provided in the EPB actuator 10 and measures and outputs a load value applied to the cable 20.

That is, the tension sensor 15 is provided to measure the force applied to the cable 20.

The current measuring unit 14 measures and outputs a driving current value of the motor 13.

At this time, the motor 13 is most preferably embedded in the EPB actuator, the DC motor is applied.

The control unit 12 compares the load value input from the tension sensor 15 and the current measuring unit 14 and the motor 13 driving current value with a preset load value and a preset motor driving current value and then the motor 13. Determine the failure of the cable 20 by measuring the drive time.

In this case, when the input load value reaches a preset load value, the controller 12 may input the driving current value of the motor 13 at the time when the input value is greater than or equal to the driving current value of the preset motor 13. In this case, it is determined that the cable (20a) of the opposite side of the tension sensor.

In addition, when the input load value does not reach a preset load value, the controller 12 may adjust the tension when the measured driving time of the motor 13 exceeds a preset time. It is determined that the cable 20b on the sensor side has failed.

The warning lamp 40 is turned on when the control unit 12 determines that the cable 20 has failed.

At this time, it is preferable to store the fault code together with the warning light 40 to be useful in the maintenance of the fault.

In addition, the fault code may be replaced by setting the lighting color of the warning light 40 differently or setting the flashing cycle differently.

 For example, if it is determined that the cable 20a on the opposite side of the tension sensor is broken, the red warning light is turned on. If it is determined that the cable 20b on the tension sensor is broken, the yellow warning light is turned on. It is to make the discrimination easier.

That is, in the case of failure detection except normal termination, it is desirable to be able to use the warning light and the failure code to be used for driver warning and maintenance.

5 is a cable failure detection waveform diagram of the side on which the tension sensor according to an embodiment of the present invention is mounted.

As shown in FIG. 5, when the cable 20b on which the load sensor is mounted is broken, the motor driving current A increases but the tension sensor value B does not change. have.

Therefore, if the motor driving current (A) increases for a period of 3 seconds depending on the operation length of the cable (20b), but if the tension sensor value (B) does not change, it is determined that the cable (20b) of the side on which the tension sensor is mounted is broken and the warning lamp Turn it on.

At this time, it is preferable to store the fault code together with the warning light so that it can be usefully used for the maintenance of the fault.

6 is a waveform diagram of a cable failure detection on the opposite side to which the tension sensor according to an embodiment of the present invention is mounted.

If the cable 20a on the opposite side where the tension sensor is mounted is broken, the value B of the tension sensor is not output at the time when the nut 17 connected to the cable 20a moves to the gearbox 19. When the nut 17 is caught by the gearbox 19 and no longer moved, the cable 20b on the side where the tension sensor is mounted is pulled, so the value B of the tension sensor connected to the cable 20b is Since it is normally connected to the DIH brake 30, the value B of the tension sensor is output.

Therefore, when the load value required for parking brake operation is reached, the motor 13 stops, and the control logic determines that the normal parking brake operation has been performed since the normal load is measured. Since the failure of the cable 20a opposite the tension sensor cannot be detected, the motor driving current A is monitored to determine the failure of the cable 20a opposite the tension sensor.

As shown in FIG. 6, when the value B of the tension sensor reaches a target load value, a current consumption of 6A to 8A is generally required, but when one cable 20 is disconnected or missing, two DIH brakes 30 are provided. Since the load applied to the load is concentrated in one DIH brake 30, the motor driving current A requires twice as much current consumption as normal.

Therefore, the motor drive current (A) is measured when the control load is terminated when the target load is reached, and when the load is operated more than twice the current consumption (6A to 8A), the cable 20a of the opposite cable with the tension sensor is operated. It can be determined as a failure.

7 is a flowchart illustrating a cable failure diagnosis method of the EPB system according to an embodiment of the present invention.

Referring to FIG. 7, in the cable failure diagnosis method of the EPB system according to an embodiment of the present invention, first, when a control signal of the parking brake is input, the controller drives the motor 13 (S10 and S12).

At this time, the motor 13 is most preferably embedded in the EPB actuator, the DC motor is applied.

Next, the control unit receives a load value from the tension sensor 15 and determines whether the predetermined target load is reached (S14).

Next, when the control unit determines that the load value reaches a preset load value as a result of the determination in step (S14), the control unit receives the drive current value of the motor 13 at the time when the control unit receives the preset drive current. It is determined whether the value is equal to or greater than the set value (S16).

At this time, the drive current value of the motor 13 is preset within 6A to 8A, and it is most preferable to determine whether it is more than twice the above range.

Accordingly, as a result of determining whether the motor 13 driving current value is 12A to 16A or more, when the motor 13 driving current value is two times or more (12A to 16A or more) of the preset range, the cable opposite to the tension sensor ( It is determined that the failure of 20a) (S18).

In addition, if the driving current of the motor 13 is not more than two times the predetermined value, it is determined that the failure is terminated normally.

When the load value does not reach the preset load value as a result of the determination in step S14, it is measured whether the driving time of the motor 13 exceeds the preset time (S20).

At this time, when the driving time of the motor 13 does not exceed a preset time, the motor 13 is driven by performing the step (S12).

However, when the driving time of the motor 13 exceeds the predetermined time, the load value is measured, and if there is no change in the load value, it is determined that the cable 20b on the tension sensor side is broken (S22 and S24).

In addition, when the driving time of the motor 13 exceeds a predetermined time, the load value is measured, and if there is a change in the load value, it is determined that the motor 13 failure and the tension sensor 15 fail (S22). , S26).

At this time, the driving time of the motor 13 is most preferably set in advance to 3 seconds.

As a result of the determination, when the cables 20a and 20b have failed, the motor 13 has failed and the tension sensor 15 has failed, the warning lamp is turned on (S28).

At this time, it is desirable to store the fault code together with the warning light so that it can be usefully used for the maintenance of the fault.

In addition, the fault code may be replaced by setting the lighting color of the warning light 40 differently or setting the flashing cycle differently.

 For example, if it is determined that the cable 20a on the opposite side of the tension sensor is broken, the red warning light is turned on. If it is determined that the cable 20b on the tension sensor is broken, the yellow warning light is turned on. It is to make the discrimination easier.

That is, in the case of failure detection except normal termination, it is desirable to be able to use the warning light and the failure code to be used for driver warning and maintenance.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill 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. I will understand. Therefore, the technical protection scope of the present invention will be defined by the claims below.

10 EPB Actuator 11 ECU
11a: microcontroller 12: control unit
13 motor 14 current measuring unit
15: tension sensor 17: nut
19: gearbox 20: cable
20a: Cable opposite the tension sensor 20b: Cable near the tension sensor
30: DIH brake 40: warning light

Claims (9)

A tension sensor provided in the EPB actuator to measure and output a load value applied to the cable;
A current measuring unit measuring and outputting a motor driving current value; And
A controller for comparing a load value and a motor driving current value input from the tension sensor and the current measuring unit with a preset load value and a preset motor driving current value, and determining a cable failure by measuring a driving time of the motor; Cable troubleshooting device of the EPB system comprising a.
The apparatus of claim 1,
When the input load value reaches the preset load value, when the input motor drive current value at the time of reaching is greater than or equal to the preset motor drive current value, it is determined as a cable failure opposite the tension sensor,
When the input load value does not reach a preset load value, when the measured driving time of the motor exceeds a preset time, if there is no change in the load value, it is determined as a cable failure on the tension sensor side. Cable fault diagnosis device of EPB system.
The method of claim 1,
Cable failure diagnosis device of the EPB system, characterized in that it further comprises a;
The control unit receives a load value from the tension sensor after driving the motor as the operation signal of the parking brake is input;
When the load value reaches a preset load value, receiving a motor driving current value at the reached time point; And
Determining, by the controller, a failure of the cable by comparing a preset motor drive current value with the motor drive current value; Cable failure diagnosis method of the EPB system comprising a.
The method of claim 4, wherein the determining of the failure of the cable comprises:
If the motor drive current value is greater than the preset motor drive current value, it is determined that the cable failure on the opposite side of the tension sensor, cable failure diagnosis method of the EPB system.
The method of claim 4, wherein the step of receiving a load value from the tension sensor comprises:
If the load value does not reach the preset load value,
Measuring a driving time of the motor, and
And determining whether the load value changes when the driving time of the motor exceeds a preset time.
The method according to claim 6,
Determining whether or not the load value changes,
If there is no change in the load value, it is determined as a cable failure on the tension sensor side,
Cable failure diagnosis method of the EPB system, characterized in that if there is a change in the load value it is determined that the motor failure and tension sensor failure.
5. The method of claim 4,
Turning on a warning light when it is determined that the cable is defective as a result of the cable failure determination; Cable failure diagnosis method of the EPB system, characterized in that it further comprises.
5. The method of claim 4,
Cable presetting method of the EPB system, characterized in that the predetermined motor drive current value is within 6A to 8A.
KR1020110133178A 2011-12-12 2011-12-12 Fault diagnosis apparatus for cable disconnection of electronic parking brake system and method thereof KR20130066386A (en)

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Application Number Priority Date Filing Date Title
KR1020110133178A KR20130066386A (en) 2011-12-12 2011-12-12 Fault diagnosis apparatus for cable disconnection of electronic parking brake system and method thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150101584A (en) * 2014-02-27 2015-09-04 주식회사 만도 Fault detecting apparatus and method of electronic parking brake
CN109195844A (en) * 2016-05-02 2019-01-11 威伯科欧洲有限责任公司 The electronically controlled braking system of energy in method and commerial vehicle for carrying out Automated electronic control to braking system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150101584A (en) * 2014-02-27 2015-09-04 주식회사 만도 Fault detecting apparatus and method of electronic parking brake
CN109195844A (en) * 2016-05-02 2019-01-11 威伯科欧洲有限责任公司 The electronically controlled braking system of energy in method and commerial vehicle for carrying out Automated electronic control to braking system

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