US 11,654,885 B2
Coasting regeneration control method and device of vehicle with continuously variable valve duration engine
Young Ho Jun, Seoul (KR); and Jung Min Yoon, Gyeonggi-do (KR)
Assigned to Hyundai Kefico Corporation, Gyeonggi-Do (KR)
Filed by HYUNDAI KEFICO CORPORATION, Gyeonggi-do (KR)
Filed on Jun. 30, 2021, as Appl. No. 17/363,888.
Claims priority of application No. 10-2020-0093349 (KR), filed on Jul. 27, 2020.
Prior Publication US 2022/0024441 A1, Jan. 27, 2022
Int. Cl. B60W 20/14 (2016.01); B60K 6/24 (2007.10); B60L 7/18 (2006.01); B60K 6/26 (2007.10); B60W 30/18 (2012.01)
CPC B60W 20/14 (2016.01) [B60K 6/24 (2013.01); B60K 6/26 (2013.01); B60L 7/18 (2013.01); B60W 30/18072 (2013.01); B60W 2510/0638 (2013.01); B60W 2520/10 (2013.01); B60W 2540/10 (2013.01); B60W 2540/12 (2013.01); B60W 2540/16 (2013.01); B60Y 2200/92 (2013.01); B60Y 2300/18125 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A coasting regeneration control method of a vehicle equipped with a continuously variable valve duration (CVVD) engine, in which an engine control unit (ECU) controls regenerative braking in the vehicle, the method comprising the steps of:
determining, by the ECU, whether a current state of the vehicle satisfies coasting regeneration conditions;
entering, by the ECU, a coasting regeneration mode and performing regenerative braking when the current state of the vehicle satisfies the coasting regeneration conditions;
continuously monitoring whether the coasting regeneration conditions are satisfied when the vehicle is driven in a coasting regeneration mode; and
ending the coasting regeneration mode when an over-run state that is one of the coasting regeneration conditions is removed based on the monitoring,
wherein when the current state of the vehicle is an over-run state, it is determined that the coasting regeneration conditions are satisfied,
wherein when entering the coasting regeneration mode, a valve overlap in which both of an exhaust valve and an intake valve are open is controlled to be maximized within a controllable range, a closing time of the intake valve is delayed after a start point of time of a compression stroke, thereby decreasing pumping loss and increasing power generation torque of the BDM, and
wherein when the coasting regeneration mode is entered, a throttle valve is fully opened so that an amount of intake air of the engine is maximized and a CVVD target duration is controlled to be maximized, such that power generation torque of a belt driven motor (BDM) is controlled to be increased.