Braking control method for electric vehicles
AssigneesHyundai Motor Company, Kia Corporation
InventorsJin Kyeom Cho, Dong Hoon Lee, Sun Woo Kim, Dong Hyeon Woo, Seok Cheon Jeon
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Abstract
A braking control method for electric vehicles, involving a non-linear deceleration profile for enhanced automatic braking, includes generating the present profile by a control device, assessing the feasibility of motor-alone braking, and implementing braking based on the profile using only the motor when appropriate. Additionally, the control device evaluates if the motor speed stays within a predetermined range during a set time before the expected stop. If the speed is within the range, the vehicle is brought to a complete stop using only the motor. This approach aims to optimize energy efficiency and ensure safe braking performance.
Claims14
A braking control method for a vehicle, the braking control method comprising:
- generating, by a control device, a non-linear deceleration profile for automatic braking operation of the vehicle;
- determining, by the control device, whether motor-alone braking is possible according to a motor temperature and a state of charge (SOC) value of a battery of the vehicle;
- performing braking of the vehicle according to the non-linear deceleration profile, by the control device, using a motor alone in response to a determination that the motor-alone braking is possible;
- determining, by the control device, whether a motor speed deviates from a predetermined reference range centered on a motor speed target profile according to the non-linear deceleration profile during a predetermined judgement time before an expected stopping time of the vehicle;
- and
- completely stopping the vehicle, by the control device, using the motor alone in response to a determination that the motor speed does not deviate from the predetermined reference range.
A braking control apparatus for a vehicle, the braking control apparatus comprising:
- a profile generator configured to generate a non-linear deceleration profile for automatic braking operation of the vehicle;
- a braking element determination unit configured to determine whether braking of the vehicle according to the non-linear deceleration profile is able to be performed by motor-alone braking, depending on a temperature of a motor of the vehicle and an SOC value of a battery of the vehicle;
- a hydraulic stop determination unit configured to determine whether to perform complete stopping of the vehicle, using a hydraulic brake, depending on whether longitudinal vibration of the vehicle occurs by determining whether a motor speed deviates from a reference range centered on a motor speed target profile according to the non-linear deceleration profile during a predetermined judgement time before an expected stopping time of the vehicle;
- and
- a motor torque controller and a hydraulic brake controller configured to perform the automatic braking of the vehicle according to the determinations of the braking element determination unit and the hydraulic stop determination unit,
- wherein the hydraulic brake controller is configured to operate the hydraulic brake to completely stop the vehicle in response to a determination by the hydraulic stop determination unit that the motor speed deviates from the reference range.
Dependencies are inferred from the claim text.