Electric parking brake system and control method therefor

Patent metadata

Field	Value
Publication number	US-12036969-B2
Application number	US-202017766259-A
Country	US
Kind code	B2
Filing date	Sep 28, 2020
Priority date	Oct 15, 2019
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

An electric parking brake system according to one embodiment comprises: a first electric parking brake provided at a front wheel of a vehicle so as to generate a first clamping force; a second electric parking brake provided at a rear wheel of the vehicle so as to generate a second clamping force; an inclination sensor for detecting the inclination degree of the vehicle; and a control unit for determining the total clamping force required for parking on the basis of the inclination degree of the vehicle and vehicle weight information, determining the electric parking brake, to be operated, from among the electric parking brakes according to the determined total clamping force, and operating the determined electric parking brake.

First claim

The invention claimed is:

1. An electronic parking brake system, comprising:
a first electronic parking brake provided on a front wheel side of a vehicle to generate a first clamping force;
a second electronic parking brake provided on a rear wheel side of the vehicle to generate a second clamping force;
a gradient sensor detecting a gradient of the vehicle; and
a controller determining a total clamping force required for parking based on a vehicle gradient and vehicle weight information, determining an electronic parking brake to operate among the electronic parking brakes according to the determined total clamping force and operating the determined electronic parking brake,
wherein a first clamping force generated by the first electronic parking brake is set to be lower than a second clamping force generated by the second electronic parking brake,
wherein the controller selectively determines an electronic parking brake to operate as at least one of the first electronic parking brake and the second electronic parking brake based on a comparison of the determined total clamping force with at least one of the first clamping force and the second clamping force.

2. The electronic parking brake system of claim 1 , wherein the controller determines the total clamping force required for parking as a higher value as the detected vehicle gradient increases and vehicle weight increases.

3. The electronic parking brake system of claim 1 , wherein the controller determines that the electronic parking brake to operate is the first electronic parking brake among the electronic parking brakes if the determined total clamping force is lower than the first clamping force.

4. The electronic parking brake system of claim 1 , wherein the controller determines that the electronic parking brake to operate is the second electronic parking brake among the electronic parking brakes if the determined total clamping force is higher than the first clamping force and lower than the second clamping force.

5. The electronic parking brake system of claim 1 , wherein the controller determines that the electronic parking brake to operate is the first electronic parking brake and the second electronic parking brake among the electronic parking brakes if the determined total clamping force is higher than the second clamping force.

6. The electronic parking brake system of claim 1 , wherein each of the electronic parking brakes is a motor-on-caliper-type electronic parking brake.

7. An electronic parking brake system, comprising:
a first electronic parking brake provided on a front wheel side of a large vehicle to generate a first clamping force;
a second electronic parking brake provided on a rear wheel side of the large vehicle to generate a second clamping force set to be higher than the first clamping force;
a gradient sensor detecting a gradient of the large vehicle; and
a controller operating the first electronic parking brake while stopping the second electronic parking brake if a weight of the large vehicle is in a first weight range in a case where the detected gradient when parking is applied is in a preset range,
stopping the first electronic parking brake while operating the second electronic parking brake if the weight of the large vehicle is in a second weight range set to be higher than the first weight range, and
operating both the first electronic parking brake and the second electronic parking brake if the weight of the large vehicle is in a third weight range set to be higher than the second weight.

8. The electronic parking brake system of claim 7 , wherein the first weight range is a curb weight range of the large vehicle, the second weight range is a gross vehicle weight range of the large vehicle, and the third weight range is a gross trailer weight rating range of the large vehicle.

9. A control method of an electronic parking brake system including a first electronic parking brake provided on a front wheel side of a vehicle to generate a first clamping force and a second electronic parking brake provided on a rear wheel side of the vehicle to generate a second clamping force, the control method comprising:
detecting a gradient of the vehicle,
determining a total clamping force required for parking based on the detected vehicle gradient and vehicle weight information,
determining an electronic parking brake to operate among the electronic parking brakes according to the determined total clamping force, and
operating the determined electronic parking brake,
wherein a first clamping force generated by the first electronic parking brake is set to be lower than a second clamping force generated by the second electronic parking brake,
wherein the determining the electronic parking brake to operate comprises selectively determining the electronic parking brake to operate as at least one of the first electronic parking brake and the second electronic parking brake based on a comparison of the determined total clamping force with at least one of the first clamping force and the second clamping force.

10. The control method of claim 9 , wherein determining the total clamping force determines the total clamping force required for parking as a higher value as the detected vehicle gradient increases and vehicle weight increases.

11. The control method of claim 9 , wherein determining the electronic parking brake to operate determines that the electronic parking brake to operate is the first electronic parking brake among the electronic parking brakes if the determined total clamping force is lower than the first clamping force.

12. The control method of claim 9 , wherein determining the electronic parking brake to operate determines that the electronic parking brake to operate is the second electronic parking brake among the electronic parking brakes if the determined total clamping force is higher than the first clamping force and lower than the second clamping force.

13. The control method of claim 9 , wherein determining the electronic parking brake to operate determines that the electronic parking brake to operate is the first electronic parking brake and the second electronic parking brake among the electronic parking brakes if the determined total clamping force is higher than the second clamping force.

Assignees

• Hl Mando Corp

Inventors

• Nam Gungjin

Classifications

• B60T8/4022

  Pump units driven by an individual electric motor (B60T8/4027 takes precedence) · CPC title

• B60T8/26

  characterised by producing differential braking between front and rear wheels {(using electrical circuitry or regulation means B60T8/17)} · CPC title

• B60T8/18

  responsive to vehicle weight or load, e.g. load distribution ({using electrical circuitry on regulation means B60T8/17; } B60T8/30 takes precedence; responsive to weight and speed condition B60T8/58) · CPC title

• B60T2250/02

  Vehicle mass · CPC title

• B60T2210/20

  Road shapes · CPC title