KR20150065030A - Control method of electronic parking brake - Google Patents

Control method of electronic parking brake Download PDF

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Publication number
KR20150065030A
KR20150065030A KR1020130150066A KR20130150066A KR20150065030A KR 20150065030 A KR20150065030 A KR 20150065030A KR 1020130150066 A KR1020130150066 A KR 1020130150066A KR 20130150066 A KR20130150066 A KR 20130150066A KR 20150065030 A KR20150065030 A KR 20150065030A
Authority
KR
South Korea
Prior art keywords
vehicle
parking brake
mode
epb switch
state
Prior art date
Application number
KR1020130150066A
Other languages
Korean (ko)
Inventor
전재우
Original Assignee
현대모비스 주식회사
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 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020130150066A priority Critical patent/KR20150065030A/en
Publication of KR20150065030A publication Critical patent/KR20150065030A/en

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Classifications

    • 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
    • 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
    • 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
    • B60T8/24—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to vehicle inclination or change of direction, e.g. negotiating bends
    • B60T8/241—Lateral vehicle inclination
    • 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
    • B60Y2400/30—Sensors
    • B60Y2400/303—Speed sensors
    • B60Y2400/3032—Wheel speed sensors

Abstract

A control method for an electronic parking brake is disclosed. The method of controlling an electronic parking brake of the present invention includes the steps of determining whether a wheel speed sensor is abnormal by a control unit, operating in an SRU (slow ramp up) mode according to EPB switch operation when the wheel speed sensor is abnormal, When the vehicle is in an unstable state, determining the state of the vehicle through the lateral acceleration sensor when the vehicle is operated, and operating the vehicle in the forced braking mode according to the EPB switch operation when the state of the vehicle is determined to be unstable.

Description

TECHNICAL FIELD [0001] The present invention relates to a control method for an electronic parking brake,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of an electronic parking brake, and more particularly, to a control method of an electronic parking brake, in which, when dynamic parking control of an electronic parking brake can not be performed, a braking force is formed according to the state of a vehicle, To a control method of the control unit.

The EPB ECU, which controls the EPB, drives the EPB motor to apply the Target Clamping Force through the EPB if the operating condition of the EPB is satisfied at the request of the driver by the electronic parking brake (EPB) So that the vehicle is kept stationary.

At this time, the EPB includes an electronically controllable electric actuator, a torque converter (such as a speed reducer or a screw), and an operating portion capable of generating a braking force by acting on the parking brake.

In addition to the ability to maintain the vehicle's stationary state, the EPB can also act to force the vehicle to brake if the brake pedal suddenly goes bad while the vehicle is running and EBP is activated.

However, when the EPB is operated while the vehicle is running, a slip phenomenon may occur, which is a phenomenon in which the vehicle slides forward due to inertia force due to rocking of the rear wheel of the vehicle. To reduce the slip phenomenon, (Dynamic Parking) control that can increase the braking force by preventing the rear wheel from locking by raising and lowering the braking force.

However, if dynamic parking control is impossible due to various causes such as can communication failure or wheel speed sensor abnormality, slip occurrence can not be reduced and there is a fear of an accident.

Therefore, it is necessary to develop a control method for ensuring braking stability by shortening the braking distance in an emergency as much as possible.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2010-0108014 (published on October 10, 2010, entitled "Braking Force Control Method of Electronic Parking Brake System").

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an electronic parking brake control system, which is capable of switching an electronic parking brake to be operated manually (SRU mode) (Braking force) by forcibly rocking the rear wheel when the vehicle enters a state in which the stability of the vehicle can not be restored (forced braking mode), thereby making it possible to shorten the braking distance in an emergency as much as possible. .

A method of controlling an electronic parking brake according to the present invention includes the steps of: determining whether a wheel speed sensor is abnormal; If the wheel speed sensor is abnormal, operating in an SRU (Slow Ramp Up) mode according to EPB switch operation; Determining the state of the vehicle through the lateral acceleration sensor when the SRU mode is activated; And operating in a forced braking mode according to the EPB switch operation if it is determined that the vehicle is in an unstable state; And a control unit.

In the present invention, the SRU mode gradually increases the braking force at a set interval when the EPB switch is turned on, and gradually releases the braking force at a set interval when the EPB switch is off.

In the present invention, the step of determining the state of the vehicle through the lateral acceleration sensor may include determining that the value of the lateral acceleration sensed by the lateral acceleration sensor exceeds a set value, , It is determined that the vehicle is in an unstable state.

In the present invention, when the EPB switch is turned on, the actuation of the forcible braking mode according to the EPB switch operation is performed by forcibly locking the left and right rear wheels of the vehicle to thereby maintain the braking force.

The electronic parking brake control method according to the present invention switches the electronic parking brake to be operated manually (SRU mode) when the dynamic parking brake control of the electronic parking brake is disabled, The braking force is formed by forcibly rocking the rear wheel (forced braking mode), thereby reducing the braking distance in the event of an emergency, thereby ensuring braking stability and reducing the risk of accidents.

1 is a block diagram showing an electronic parking brake control apparatus according to an embodiment of the present invention.
2 is a flowchart showing an operation flow of a method of controlling an electronic parking brake according to an embodiment of the present invention.

Hereinafter, a method of controlling an electronic parking brake according to an embodiment of 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.

Further, 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.

1 is a block diagram showing an electronic parking brake control apparatus according to an embodiment of the present invention.

1, an electronic parking brake control apparatus according to an embodiment of the present invention includes a wheel speed sensor 10, a lateral acceleration sensor 20, an EPB switch 30, a control unit 40, and a wheel ECU 50 ).

The wheel speed sensor 10 senses the wheel speed.

The lateral acceleration sensor 20 senses the lateral acceleration, and senses the acceleration that causes the vehicle to be pushed outward by the centrifugal force.

The EPB switch 30 is a driver input switch, and braking is turned on / off according to the operation.

The control unit 40 determines whether the wheel speed sensor 10 has failed or not and if the wheel speed sensor 10 is abnormal, the control unit 40 changes the vehicle to the SRU (slow ramp up) mode according to the operation of the EPB switch 30 .

More specifically, the ON / OFF operation of the EPB switch 30 operated by the user is input.

At this time, when the dynamic parking control of the EPB is impossible due to various reasons (for example, when the vehicle turns round and round due to sudden cornering), the SRU mode is manually operated to prevent the rocking of the rear wheel, When the vehicle enters the SRU mode and the EPB switch 30 is turned ON, the braking force is gradually increased at a set interval. When the EPB switch 30 is turned OFF, the braking force is set at a set interval It is a mode to release gradually.

In addition, when the vehicle is operated in the SRU mode, the state of the vehicle can be determined using an acceleration / deceleration sensor (not shown) and a lateral acceleration sensor 20.

At this time, when the value of the lateral acceleration sensed by the lateral acceleration sensor 20 exceeds the set value and the time exceeding the set value exceeds the set time, the state of the vehicle is set to the stable state It is determined that the vehicle is in an unstable state.

Therefore, when the EPB switch 30 is turned on, the control unit 40 cancels the SRU mode and activates the forced braking mode in a situation where it is determined that the vehicle is in an unstable state.

Here, the forced braking mode is a mode for forcibly locking the left rear wheel and the right rear wheel of the vehicle to maintain the braking force.

Further, even when the EPB switch 30 is turned off when the forced braking mode is turned on, the braking force may be maintained to delay the input of the EPB switch 30 so that the vehicle is stopped.

The wheel ECU 50 controls each wheel (not shown) under the control of the control unit 40.

As described above, the electronic parking brake control apparatus according to the embodiment of the present invention switches the electronic parking brake to be operated in the manual (SRU mode) when the dynamic parking brake control of the electronic parking brake is disabled, By detecting the stable state and entering the state where the stability of the vehicle can not be restored, the rear wheel is forcibly rocked and controlled to form the braking force, so that the braking distance in the event of emergency can be shortened as much as possible, Can be reduced.

FIG. 2 is a flowchart illustrating an operation flow of a method for controlling an electronic parking brake according to an embodiment of the present invention. Referring to FIG. 2, a specific operation of the present invention will be described.

The control unit 40 determines whether the wheel speed sensor 10 fails (S10).

If it is determined in step S10 that the wheel speed sensor 10 is abnormal, it is determined whether the EPB switch is ON / OFF (S20).

If it is determined in step S20 that the EPB switch 30 is operated, the vehicle is operated in the SRU (Slow Ramp Up) mode (S30).

At this time, when the dynamic parking control of the EPB is impossible due to various reasons (for example, when the vehicle turns round and round due to sudden cornering), the SRU mode is manually operated to prevent the rocking of the rear wheel, When the vehicle enters the SRU mode and the EPB switch 30 is turned ON, the braking force is gradually increased at a set interval. When the EPB switch 30 is turned OFF, the braking force is set at a set interval It is a mode to release gradually.

When the vehicle is operated in the SRU mode, the state of the vehicle is determined using an acceleration / deceleration sensor (not shown) and a lateral acceleration sensor 20 (S40).

More specifically, when the value of the lateral acceleration sensed by the lateral acceleration sensor 20 exceeds the set value and exceeds the set time, the vehicle can return to the stable state again even if the braking force is removed It is judged that the state of the vehicle is unstable.

Therefore, when the EPB switch 30 is turned on (S50), the control unit 40 releases the SRU mode and activates the forced braking mode (S60) in a situation where it is determined that the vehicle is in an unstable state.

Here, the forced braking mode is a mode for forcibly locking the left rear wheel and the right rear wheel of the vehicle to maintain the braking force.

Further, even when the EPB switch 30 is turned off when the forced braking mode is turned on, the braking force may be maintained to delay the input of the EPB switch 30 so that the vehicle is stopped.

As described above, in the method of controlling the electronic parking brake according to the embodiment of the present invention, when the electronic parking brake is entered into a section in which the dynamic parking control can not be performed, the electronic parking brake is switched to be operated manually (SRU mode) By detecting the stable state and entering the state where the stability of the vehicle can not be restored, the rear wheel is forcibly rocked and controlled to form the braking force, so that the braking distance in the event of emergency can be shortened to maximize braking stability, Can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention as defined by the appended claims. will be. Accordingly, the true scope of the present invention should be determined by the following claims.

10: Wheel speed sensor 20: Lateral acceleration sensor
30: EPB switch 40:
50: Wheel ECU

Claims (4)

Determining whether a wheel speed sensor is abnormal;
If the wheel speed sensor is abnormal, operating in an SRU (Slow Ramp Up) mode according to EPB switch operation;
Determining the state of the vehicle through the lateral acceleration sensor when the SRU mode is activated; And
Operating in a forced braking mode according to the EPB switch operation if it is determined that the vehicle is in an unstable state; And a control device for controlling the electronic parking brake.
2. The method of claim 1, wherein the SRU mode
Wherein when the EPB switch is turned on, the braking force is gradually increased at a set interval, and when the EPB switch is turned off, the braking force is gradually released at a set interval.
The method as claimed in claim 1, wherein the step of determining the state of the vehicle through the lateral acceleration sensor
Wherein when the value of the lateral acceleration sensed by the lateral acceleration sensor exceeds the set value and the time exceeding the set value exceeds the set time, it is determined that the state of the vehicle is in the unstable state Control method of parking brake.
2. The method of claim 1, wherein operating in a forced braking mode in accordance with the EPB switch actuation
Wherein when the EPB switch is turned on, the left and right rear wheels of the vehicle are forcibly rocked to maintain the braking force.
KR1020130150066A 2013-12-04 2013-12-04 Control method of electronic parking brake KR20150065030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130150066A KR20150065030A (en) 2013-12-04 2013-12-04 Control method of electronic parking brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130150066A KR20150065030A (en) 2013-12-04 2013-12-04 Control method of electronic parking brake

Publications (1)

Publication Number Publication Date
KR20150065030A true KR20150065030A (en) 2015-06-12

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KR1020130150066A KR20150065030A (en) 2013-12-04 2013-12-04 Control method of electronic parking brake

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180052983A (en) * 2016-11-11 2018-05-21 현대자동차주식회사 Control method for drift logic of vehicle equipped with epb
WO2021158032A1 (en) * 2020-02-04 2021-08-12 주식회사 만도 Electronic brake system and method for controlling same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180052983A (en) * 2016-11-11 2018-05-21 현대자동차주식회사 Control method for drift logic of vehicle equipped with epb
WO2021158032A1 (en) * 2020-02-04 2021-08-12 주식회사 만도 Electronic brake system and method for controlling same
CN115038625A (en) * 2020-02-04 2022-09-09 株式会社万都 Electronic brake system and control method thereof
EP4086126A4 (en) * 2020-02-04 2023-07-05 HL Mando Corporation Electronic brake system and method for controlling same
CN115038625B (en) * 2020-02-04 2024-04-23 汉拿万都株式会社 Electronic brake system and control method thereof

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