KR20150062325A - Method for brake force compensation of brake fade in vehicle - Google Patents

Method for brake force compensation of brake fade in vehicle Download PDF

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Publication number
KR20150062325A
KR20150062325A KR1020130146849A KR20130146849A KR20150062325A KR 20150062325 A KR20150062325 A KR 20150062325A KR 1020130146849 A KR1020130146849 A KR 1020130146849A KR 20130146849 A KR20130146849 A KR 20130146849A KR 20150062325 A KR20150062325 A KR 20150062325A
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KR
South Korea
Prior art keywords
brake
braking force
fade
compensating
vehicle
Prior art date
Application number
KR1020130146849A
Other languages
Korean (ko)
Inventor
이도훈
Original Assignee
쌍용자동차 주식회사
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Publication date
Application filed by 쌍용자동차 주식회사 filed Critical 쌍용자동차 주식회사
Priority to KR1020130146849A priority Critical patent/KR20150062325A/en
Publication of KR20150062325A publication Critical patent/KR20150062325A/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
    • 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
    • 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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/06—Disposition of pedal
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D65/84—Features relating to cooling for disc brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/21—Providing engine brake control

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Regulating Braking Force (AREA)

Abstract

The present invention relates to a braking force control method using an engine brake braking force for compensating a braking force through a low-gear-shift and / or an engine-torque reduction during braking when it is determined to be a brake fade, Confirming a brake pedal operating state when the position is in a drive state and the vehicle speed is a predetermined speed or more; Determining whether the brake pedal is in the on-state, determining whether the brake pedal is in a brake fade state according to the brake pressure and the disc temperature; If it is determined that the brake fade is not determined, the braking force is executed by operating only the brake, and if the brake fade is determined, the braking force is controlled by compensating the braking force simultaneously with the brake operation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of compensating a braking force of a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a braking force compensation apparatus for a vehicle, and more particularly, to a braking force compensation apparatus for compensating a braking force by compensating for a braking force And a braking force compensation method in brake fading of a vehicle.

Generally, a braking device of an automobile is a braking device used for decelerating or stopping a running vehicle and maintaining the parking state. The braking device usually converts kinetic energy of the automobile into heat energy using frictional force, Friction brake is used.

The braking device converts the kinetic energy into thermal energy to exhibit the braking force. Accordingly, when the braking state is maintained, the brake drum or the disk is heated. When the heated temperature exceeds a predetermined temperature, The coefficient is lowered to cause a fading phenomenon that causes the braking force to be lost.

If a fading phenomenon occurs as described above, the braking distance of about 30 to 100% is prolonged depending on the condition of brake fade braking, which is a risk factor for safe driving.

Conventional techniques for controlling braking in the brake fading phenomenon as described above are disclosed in Korean Patent Laid-Open Publication No. 1998-034902 (published on Aug. 5, 1998) and Japanese Patent Laid- 10-2007-0023080 (published on Feb. 28, 2007) and Patent Document 3 (Korean Patent Laid Open Publication No. 10-2013-0061582 (published on June 11, 2013)).

In the prior art disclosed in Patent Document 1, a brake temperature sensor is provided on the lining and pad of each wheel, and the gear is shifted to the lower stage step by step in the brake operation according to the gear position signal and the brake temperature sensor, Solved the braking power loss problem.

The prior art disclosed in Patent Document 2 detects signals according to the braking state of the vehicle and analyzes the signals to compensate for the air flow from the air tank to the air master when air compensation is required to compensate for the braking force reduction of the vehicle .

The prior art disclosed in Patent Document 3 provides a stable braking distance by compensating the wheel pressure when a fade generating condition is detected during operation of the brake pedal.

Korean Patent Laid-Open Publication No. 1998-034902 (published on Aug. 5, 1998) Korean Patent Publication No. 10-2007-0023080 (published on February 28, 2007) Korean Patent Publication No. 10-2013-0061582 (published on June 11, 2013)

However, the above-described conventional techniques use only a condition of a temperature sensor or an oil pressure sensor to determine whether or not a brake fade phenomenon occurs.

In addition, when it is determined that the vehicle is in the fade condition, the braking force is controlled by performing the downshift, compensating for the air, or using the braking force correction value. However, the braking force compensation can be performed to some extent, .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a braking system for a vehicle that is capable of compensating a braking force through a low- The braking force compensating method at the time of brake fading.

It is another object of the present invention to provide a braking force compensation method at the time of brake fading of a vehicle in which the braking force is compensated for by reducing the engine torque when braking the brake fade, thereby achieving safe driving.

In order to achieve the above object, the present invention provides a braking force compensation method for a vehicle in a brake fade state, comprising: (a) when the engine is driven, the gear position is the drive state, ; (b) if the brake pedal is on, determining whether the brake pedal is on or off according to the brake pressure and the disc temperature; (b) if it is determined that the brake fade is not performed, braking force is exerted by operating only the brake alone, and if it is determined to be the brake fade, braking force is controlled by compensating the braking force simultaneously with the brake operation .

Wherein the step (b) comprises the steps of: (b1) confirming whether the brake pressure is equal to or higher than the braking force compensation pressure; (b2) determining whether the brake disk is in a brake fade state or not by checking whether the brake disk temperature is equal to or higher than the braking force compensation temperature when the brake pressure is equal to or higher than the braking force compensation pressure.

The step (c) includes a method of compensating the braking force by transmitting a low gear transmission command to the transmission control unit (TCU), a method of compensating the braking force by transmitting a torque reduction command to the engine control unit (ECU) A method of compensating the braking force by transmitting a low gear transmission command to the engine control unit (TCU), and a method of compensating for the braking force by transmitting a torque reduction command to the engine control unit (ECU) do.

According to the present invention, when it is determined that the vehicle is a brake fade, braking force can be compensated through downshift during braking, thereby providing safe operation.

In addition, according to the present invention, there is an advantage that the braking force is compensated for by reducing the engine torque when the brake fade is braked, thereby achieving safe driving.

1 is a configuration diagram of a braking force control apparatus to which a braking force compensation method in a brake fading of a vehicle according to a preferred embodiment of the present invention is applied;
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vehicle braking force compensation method.

Hereinafter, a braking force compensation method for brake fading of a vehicle according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a braking force control apparatus to which a braking force compensation method at the time of brake fading of a vehicle according to a preferred embodiment of the present invention is applied. The brake fade determination unit 10, the transmission control unit 20, and / Device (30).

The braking force control apparatus for a vehicle according to the present invention can compensate the braking force using only the brake fade determining unit 10 and the transmission control unit 20 and can use only the brake fade determining unit 10 and the engine control unit 30 And it is possible to compensate the braking force by including both the brake fade determining unit 10, the transmission control unit 20, and the engine control device 30. [

Actually, the present invention can control the braking force in the three braking force control modes as described above, and FIG. 1 shows all of the braking force control devices for the three modes for the sake of convenience.

The brake fade determining unit 10 determines the brake fade level based on the temperature detected by the friction material temperature sensor, the vehicle speed detected by the vehicle speed sensor, the number of brake operations obtained through the vehicle control unit, the brake pressure To determine a brake fade, and to output a gear downshift command and / or a torque reduction command.

The transmission control unit (TCU) 20 compensates the braking force by performing a gear change in accordance with a gear downshift command issued from the brake fade determiner 10.

The engine control unit (ECU) 30 performs engine torque reduction according to a torque reduction command generated from the brake fade determination unit 10 to compensate for the braking force.

2 is a flowchart showing a braking force compensation method in brake fading of a vehicle according to the present invention, wherein S represents a step.

As shown in FIG. 2, the brake braking force compensation method for a vehicle according to the present invention includes: (a) when the engine is driven, the gear position is the drive state, (S10 to S20); (b) if the brake pedal is on, determining whether the brake pedal is on or off according to the brake pressure and the disc temperature (S30, S50); (b) if it is determined that the brake fade is not performed, braking force is exerted by operating only the brake alone, and when it is determined to be the brake fade, braking force is controlled by compensating the braking force simultaneously with the brake operation (S40, S60).

(B) step (S30) includes the steps of: (b1) confirming whether the brake pressure is equal to or higher than the braking force compensating pressure (30 kgf / cm2) (S30); (b2) If the brake pressure is equal to or greater than the braking force compensating pressure (30 kgf / cm2), it is preferable to determine whether brake fade is occurring or not by checking whether the brake disk temperature is equal to or higher than the braking force compensation temperature (300 deg.

(C) Steps S40 and S60 include a method of compensating the braking force by transmitting a low gear transmission command to the transmission control unit (TCU), a method of compensating the braking force by transmitting a torque reduction command to the engine control unit (ECU) , A method of compensating a braking force by transmitting a low gear transmission command to the transmission control unit (TCU), and a method of compensating a braking force by transmitting a torque reduction command to an engine control unit (ECU) It is desirable to compensate.

The braking force compensation method at the time of brake fading of the vehicle according to the present invention will be described in detail as follows.

First, in step S10, the brake fade determining unit 10 checks the brake pedal operation state in step S20 when the engine is driven, the gear position is the drive D state, and the vehicle speed is the predetermined speed (30 kph) or more.

If it is determined that the brake pedal is on, the process proceeds to step S30 to check whether the brake pressure is equal to or higher than the braking force compensating pressure (30 kgf / cm2). Here, various environment information for determining a brake fade is input to the brake fade determination unit 10. [ For example, when the temperature of the brake disk detected using the friction material temperature sensor, the vehicle speed by the vehicle speed sensor, the number of brake operations acquired through the vehicle control device, and the brake pressure using the oil pressure sensor are judged as a brake fade Are input into various environmental conditions.

If the brake pressure is less than the braking force compensating pressure (30 kgf / cm2), the braking force compensation is not performed, by comparing the brake pressure and the predetermined braking force compensation pressure (30 kgf / cm2) . In this case, the process goes to step S40 to perform the braking operation only by the brake alone operation.

If the brake pressure becomes equal to or higher than the braking force compensating pressure (30 kgf / cm2), it is determined that the brake fade is primarily performed, and the routine proceeds to step S50. In step S50, the disk temperature detected through the temperature sensor is compared with a predetermined braking force compensation temperature ). As a result of the comparison, when the detected disk temperature is lower than the braking force compensation temperature (300 DEG C), braking force compensation is not performed. In this case, the process goes to step S40 to perform the braking operation only by the brake alone operation.

On the other hand, if the disk temperature is equal to or higher than the braking force compensation temperature (300 DEG C), it is determined to be the brake fade finally and a gear downshift command is transmitted to the transmission control unit 20, Command transmission to the transmission control unit 20, or transmits a gear reduction command to the transmission control unit 20, and at the same time, transmits a torque reduction command to the engine control unit 30. [ For example, the present invention accurately determines whether or not a brake fade occurs by considering both the brake pressure and the disk temperature among various environmental information generated during operation.

If it is determined to be a brake fade, the braking force is compensated simultaneously with the brake operation in step S60.

That is, according to the present invention, the transmission downshift command is outputted from the transmission control unit (TCU), and the engine brake is controlled so that the braking force is compensated by using the engine brake in addition to the brake operation.

As another method, the engine torque reduction control is performed in the engine control unit (ECU), and the braking force is added by adding the braking force in addition to the braking operation.

As another method, the transmission control unit (TCU) outputs a gear downshift command to compensate the braking force by controlling the engine brake, and the engine control unit (ECU) performs the engine-coat reducing control to compensate the braking force .

As described above, according to the present invention, the brake fade is accurately determined through various environmental information, and when the brake fade is determined, the braking force is compensated by the engine brake operation and the engine torque reduction method alone or in parallel to realize the optimum braking force even in the brake fade It will be possible.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

10: Brake fade determination unit 20: Transmission control unit (TCU)
30: Engine control device.

Claims (3)

A method of controlling a braking force in a vehicle in a brake fade,
(a) confirming an operation state of the brake pedal when the engine is driven, the gear position is the drive state, and the vehicle speed is the predetermined speed or more;
(b) if the brake pedal is on, determining whether the brake pedal is on or off according to the brake pressure and the disc temperature;
(b) if it is determined that the brake fade is not performed, braking force is exerted by operating only the brake alone, and if it is determined to be the brake fade, braking force is controlled by compensating the braking force simultaneously with the brake operation Wherein the braking force is applied to the vehicle.
The method of claim 1, wherein the step (b) comprises: (b1) confirming whether the brake pressure is equal to or higher than the braking force compensation pressure; (b2) determining whether or not brake fade has occurred by checking whether the brake disk temperature is equal to or higher than the braking force compensation temperature when the brake pressure is equal to or higher than the braking force compensating pressure.
The method according to claim 1, wherein the step (c) includes: a method of compensating a braking force by transmitting a low gear transmission command to a transmission control unit (TCU); a method of compensating a braking force by transmitting a torque reduction command to an engine control unit A method of compensating the braking force by transmitting a low gear transmission command to the transmission control unit (TCU), and a method of compensating the braking force by transmitting a torque reduction command to the engine control unit (ECU) Wherein the braking force is applied to the vehicle.
KR1020130146849A 2013-11-29 2013-11-29 Method for brake force compensation of brake fade in vehicle KR20150062325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130146849A KR20150062325A (en) 2013-11-29 2013-11-29 Method for brake force compensation of brake fade in vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130146849A KR20150062325A (en) 2013-11-29 2013-11-29 Method for brake force compensation of brake fade in vehicle

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KR20150062325A true KR20150062325A (en) 2015-06-08

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170065875A (en) 2015-12-04 2017-06-14 현대자동차주식회사 System and method for compensation breaking force adapted temperature and humidity
CN108382384A (en) * 2017-01-26 2018-08-10 空中客车英国运营有限责任公司 Fault detect based on brake torque and temperature
CN115534906A (en) * 2022-12-01 2022-12-30 小米汽车科技有限公司 Braking efficiency degradation compensation method, device, vehicle and storage medium

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170065875A (en) 2015-12-04 2017-06-14 현대자동차주식회사 System and method for compensation breaking force adapted temperature and humidity
CN108382384A (en) * 2017-01-26 2018-08-10 空中客车英国运营有限责任公司 Fault detect based on brake torque and temperature
CN108382384B (en) * 2017-01-26 2022-01-28 空中客车英国运营有限责任公司 Brake torque and temperature based fault detection
CN115534906A (en) * 2022-12-01 2022-12-30 小米汽车科技有限公司 Braking efficiency degradation compensation method, device, vehicle and storage medium
CN115534906B (en) * 2022-12-01 2023-02-28 小米汽车科技有限公司 Braking efficiency degradation compensation method, device, vehicle and storage medium

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