Disclosed are a method and a device for controlling regenerative braking of a continuously variable valve duration (CVVD) engine mild hybrid vehicle. According to the present invention, the method for controlling regenerative braking of a CVVD engine mild hybrid vehicle comprises the following steps of: determining whether a current state of the vehicle satisfies coasting regenerative braking conditions; and entering a coasting regenerative braking mode and performing regenerative braking when the current state of the vehicle satisfies the coasting regenerative braking conditions. Upon the entry into the coasting regenerative braking mode, a throttle valve is fully opened such that an intake air amount of the engine is maximized, a CVVD target duration is controlled to be maximized and late intake valve closure (LIVC) is performed on a closing timing of an intake valve after a start timing of a compression stroke, thereby reducing the pumping loss of the engine. According to the present invention, when the pumping loss of the engine is reduced through CVVD control in a coasting situation, the generated torque of a motor (belt driven motor (BDM)) is increased as much as the reduction of the pumping loss without affecting the deceleration of the vehicle, thereby increasing the amount of energy recovered by motor power generation without an additional mechanical device.
CVVD 엔진 마일드 하이브리드 차량의 회생 제동 제어 방법 및 장치가 개시된다. 본 발명에 따른 CVVD 엔진 마일드 하이브리드 차량의 회생 제동 제어 방법은, 차량의 현재 상태가 코스팅(Coasting) 회생 제동 요건을 충족하는지 판단하고, 현재 차량의 상태가 코스팅 회생 제동 요건을 충족하면, 코스팅 회생 제동 모드에 진입하여 회생 제동을 수행하되, 코스팅 회생 제동 모드에 진입하면, 엔진 흡입 공기량이 최대가 되도록 스로틀 밸브(Throttle valve)를 완전 개방하고, CVVD 목표 듀레이션(Target Duration)을 최대값으로 제어하여 흡기밸브의 닫힘 시기를 압축행정 개시 점 이후로 지각(LIVC, Late Intake Valve Closure)시킴으로써 엔진 펌핑손실(Pump loss)를 감소시키는 것을 특징으로 한다. 이와 같은 본 발명에 따르면, 코스팅(Coasting) 상황에서의 CVVD 제어를 통해 엔진의 펌핑손실(Pump loss)가 감소되면, 차량의 감속도에 영향을 주지 않고 펌핑손실이 감소된 만큼 모터(BDM, Belt Driven Motor)의 발전 토크가 증대되므로, 별도의 기계장치 추가 없이 모터 발전에 의하여 회수되는 에너지량을 증대시킬 수 있다.
CVVD Coasting regeneration control method and device of CVVD engine with MHEV
CVVD 엔진 마일드 하이브리드 차량의 회생 제동 제어 방법 및 장치
2022-02-07
Patent
Electronic Resource
Korean
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen |
CVVD Coasting regeneration control method and device of CVVD engine with MHEV
European Patent Office | 2022
Development of continuously variable valve duration ( CVVD ) engine
Automotive engineering | 2016
|CVVD METHOD AND APPARATUS FOR DIAGNOSING CONTINUOUS VARIABLE VALVE DURATION APPARATUS
European Patent Office | 2018
|CVVD METHOD AND APPARATUS FOR DIAGNOSING CONTINUOUS VARIABLE VALVE DURATION APPARATUS
European Patent Office | 2021
CVVD METHOD AND APPARATUS FOR LEARNING POSITION OF CONTINUOUS VARIABLE VALVE DURATION APPARATUS
European Patent Office | 2021