US 11,738,735 B2
Method for warning sufficiency of a parking braking force
Hwi-Bong Chang, Seoul (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Motors Corporation, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA MOTORS CORPORATION, Seoul (KR)
Filed on Nov. 1, 2019, as Appl. No. 16/672,070.
Claims priority of application No. 10-2019-0013447 (KR), filed on Feb. 1, 2019.
Prior Publication US 2020/0247382 A1, Aug. 6, 2020
Int. Cl. B60T 17/22 (2006.01); G07C 5/08 (2006.01); B60Q 9/00 (2006.01); B60T 7/04 (2006.01); B60T 7/08 (2006.01)
CPC B60T 17/221 (2013.01) [B60Q 9/002 (2013.01); B60T 7/04 (2013.01); B60T 7/08 (2013.01); G07C 5/08 (2013.01); B60T 2210/20 (2013.01); B60T 2220/04 (2013.01); B60T 2250/00 (2013.01); B60T 2250/02 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method for providing a warning regarding sufficiency of a braking force for parking, the method comprising:
confirming, by a controller, whether a parking pedal or a parking lever mounted on a vehicle is operated;
confirming, by the controller, a brake state of the vehicle;
measuring, by the controller, a slope of a place where the vehicle is located;
calculating, by the controller, an actual braking force for parking of the vehicle and a required braking force for parking of the vehicle based on information of the vehicle and the slope, wherein the actual braking force for parking is calculated based on a vehicle weight, the slope, a determined friction coefficient of a brake pad in contact with a brake disk, and a pressurizing force, and the required braking force for parking is calculated based on the vehicle weight and the slope; and
determining, by the controller, whether the actual braking force for parking is smaller than the required braking force for parking,
wherein when the actual braking force for parking or a recalculated actual braking force for parking is smaller than the required braking force for parking, an output signal is generated from the controller to warn the driver of a vehicle slip,
wherein after warning the driver, the method further comprises:
operating, by the driver, the parking pedal or the parking lever mounted on the vehicle again;
recalculating, by the controller, the actual braking force for parking; and
determining again, by the controller, whether the recalculated actual braking force for parking is smaller than the required braking force for parking to warn the driver of the vehicle slip again,
wherein confirming, by the controller, the brake state of the vehicle comprises:
measuring or estimating, by the controller, a temperature of the brake disk mounted on the vehicle;
determining, by the controller, the friction coefficient of the brake pad mounted on the vehicle based on the measured or estimated temperature of the brake disk; and
measuring, by the controller, a degree of manipulation of the parking pedal or the parking lever as a stroke sensing value,
wherein a pressurizing force by which the brake pad presses the brake disk is calculated, by the controller, based on the stroke sensing value,
wherein the friction coefficient of the brake pad is determined in advance based on the measured or estimated temperature of the brake pad through a number of experiments, and
wherein when the temperature of the brake disk is measured during operation of the parking pedal or the parking lever, the actual braking force for parking is calculated by using the friction coefficient.