Method for brake force compensation of vehicle

Patent metadata

Field	Value
Publication number	US-12434675-B2
Application number	US-202117539777-A
Country	US
Kind code	B2
Filing date	Dec 1, 2021
Priority date	Jun 29, 2021
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A method for controlling corrected target hydraulic brake force to be generated by estimating friction coefficient variation depending on a bushing degree of a brake friction material and a season change, may include: determining a hydraulic brake torque required for hydraulic braking according to a driver's request brake torque; converting the hydraulic brake torque into a brake hydraulic pressure by use of a torque factor which is a friction capability of a brake friction material in the hydraulic brake torque; and determining a correction amount of the torque factor according to a season and a bushing degree of the brake friction material, which influences a friction coefficient which is an element of the torque factor.

First claim

What is claimed is:

1. A method for brake force compensation for a brake apparatus of a vehicle, the method comprising:
determining, by a controller, hydraulic brake torque required for hydraulic braking of the brake apparatus according to a driver's request brake torque;
converting, by the controller, the hydraulic brake torque into a brake hydraulic pressure by use of a torque factor which is a friction capability of a brake friction material in the hydraulic brake torque;
determining, by the controller, a correction amount of the torque factor according to a season and a bushing degree of the brake friction material, which influences a friction coefficient of the brake friction material which is an element of the torque factor, so as to determine a target hydraulic brake torque; and
controlling the brake apparatus according to the determined target hydraulic brake force.

2. The method of claim 1 , wherein the hydraulic brake torque is further determined by subtracting regenerative brake torque from the driver's request brake torque.

3. The method of claim 1 , wherein a first correction gain required for determining the correction amount of the torque factor depending on the bushing degree of the brake friction material is determined in conjunction with a driving mileage of the vehicle.

4. The method of claim 1 , wherein a second correction gain required for determining the correction amount of the torque factor depending on the bushing degree of the brake friction material is determined by determining an accumulation amount of hydraulic brake energy.

5. The method of claim 4 , wherein the hydraulic brake energy is determined according to an equation below:

Δ
⁢

E
friction

=

∫
0

Δ
⁢
t

F
·
v
·
Δ

⁢
t

=

∫
0

Δ
⁢
t

∑

C
p

·

P
whl

R
tire

·
v
·
Δ

⁢
t

wherein Cp represents a brake factor, Pwhl represents wheel brake hydraulic pressure, R represents a dynamic radius of a tire, v represents a vehicle velocity, and Δt represents an execution cycle.

6. The method of claim 1 , wherein the correction amount of the torque factor depending on the season is determined as a correction amount predetermined according to a current season estimated by considering at least one information of date information, region information, a vehicle outer temperature, and a vehicle inner temperature.

7. The method of claim 6 , wherein when the date information exists in a predetermined range of dates, an average vehicle outer temperature is less than a predetermined winter temperature, and an initial vehicle inner temperature change rate after the vehicle is started is equal to or greater than a predetermined winter temperature change amount, the controller concludes that the season is changed from autumn to winter.

8. The method of claim 6 , wherein when the date information exists in a predetermined range of dates or an average vehicle outer temperature exists between a predetermined winter temperature and a predetermined summer temperature, the controller concludes that the season is changed from winter to spring or the season is changed from summer to autumn.

9. The method of claim 6 , wherein when the date information exists in a predetermined range of dates, an average vehicle outer temperature is greater than a predetermined summer temperature, and an initial vehicle inner temperature change rate after the vehicle is started is equal to or less than a predetermined summer temperature change amount, the controller concludes that the season is changed from spring to summer.

10. A non-transitory computer readable storage medium on which a program for performing the method of claim 1 is recorded.

11. A brake apparatus for brake force compensation of a vehicle, the brake apparatus comprising:
a sensor configured for sensing a driver's request brake amount in response to a driver's stepping on a brake pedal;
a controller electrically connected to the sensor and configured for:
determining a hydraulic brake torque required for hydraulic braking of the brake apparatus according to a request brake torque determined from the driver's request brake amount;
converting the determined hydraulic brake torque into a brake hydraulic pressure by use of a torque factor which is a friction capability of a brake friction material in the hydraulic brake torque;

determining a correction amount of the torque factor according to a season and a bushing degree of the brake friction material, which influences a friction coefficient of the brake friction material which is an element of the torque factor, so as to determine a target hydraulic brake torque; and
controlling the brake apparatus according to the determined target hydraulic brake force.

12. The brake apparatus of claim 11 , the hydraulic brake torque is further determined by subtracting regenerative brake torque from the driver's request brake torque.

13. The brake apparatus of claim 11 , wherein a first correction gain required for determining the correction amount of the torque factor depending on the bushing degree of the brake friction material is determined in conjunction with a driving mileage of the vehicle.

14. The brake apparatus of claim 11 , wherein a second correction gain required for determining the correction amount of the torque factor depending on the bushing degree of the brake friction material is determined by determining an accumulation amount of

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Yang Byeong-Cheol
• Kim Gwi-Chul
• Ju Sung-In
• Lim Sung-Keun
• Chun Se-Won

Classifications

• B60T8/172 Primary

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T2210/30

  Environment conditions or position therewithin · CPC title

• B60T2210/12

  Friction · CPC title

• B60Y2400/81

  Braking systems · CPC title

• B60T2270/60

  Regenerative braking · CPC title