Abstract:
본 발명은 터보차져 디젤 엔진에 적용되는 연소압 센서를 이용하여 부스트 압력을 측정하는 연소압 센서를 이용한 부스트 압력 측정 방법에 관한 것이다. 이를 위한 본 발명의 실시예는, 터보차져 디젤 엔진에 적용되는 연소압 센서를 이용하여 부스트 압력을 측정하는 방법으로서, 상기 연소압 센서를 이용하여 흡기밸브담힘(IVC; intake valve close) 이후의 압력으로서 제1 압력(P 1 ) 및 이 제1 압력(P 1 )에 대응하는 제1 실린더 부피(V 1 )를 획득하는 단계; 상기 연소압 센서를 이용하여 연료분사 전의 압력으로서 제2 압력(P 2 ) 및 이 제2 압력(P 2 )에 대응하는 제2 실린더 부피(V 2 )를 획득하는 단계; 상기 연소압 센서를 이용하여 하사점(BDC)의 압력(P BDC )을 획득하는 단계; 보일의 법칙을 이용하여 상기 제1 압력(P 1 )과 제2 압력(P 2 ) 간의 차이를 산출하는 단계; 및 상기 제1 압력(P 1 )과 제2 압력(P 2 ) 간의 차이 및 상기 하사점 압력(P BDC )을 기초로 부스트압을 산출하는 단계;를 포함할 수 있다.
Abstract:
The present invention relates to a pilot fuel injection correcting method of a diesel engine and a system thereof for correcting an error of a pilot fuel injection amount according to a change of operating characteristics of an injector for spraying a fuel in a diesel engine. According to an embodiment of the present invention, a pilot fuel injection correction method of a diesel engine comprises: a step for judging whether a mileage of a vehicle is over a predetermined mileage or not; a step for judging an overrun state that a diesel engine does not spray a fuel in case the mileage of a vehicle is over a predetermined mileage; a step for spraying a fuel in a setting condition corresponding to a setting reference heat generating amount, in case the diesel engine is in an overrun state; a step for detecting a combustion pressure by a fuel sprayed in the setting condition; a step for producing a heat generating amount based on the detected combustion pressure; a step for storing a heat generating difference as a pilot fuel spray correction value by producing the heat generating difference value by comparing the produced heat generating amount and the reference heat generating amount; and a step for spraying a pilot fuel by correcting the fuel spraying time, a spraying pressure, and a spraying amount based on the pilot fuel spray correction value. [Reference numerals] (AA) START;(BB,DD) NO;(CC,EE) YES;(FF) END;(S110) Vehicle mileage >= Predetermined mileage ?;(S120) Overrun state that a fuel is not sprayed ?;(S130) Spray a fuel in a condition corresponding to a reference heat generating amount;(S140) Detect a combustion pressure by a combustion pressure sensor;(S150) Calculate a combustion heat generation amount based on the detected combustion pressure (Use Ideal gas law and Law of thermodynamics);(S160) Calculate a heat generation difference value by comparing the calculated heat generation amount and a reference heat generation amount;(S170) Calculate, and store a fuel spray correction value based on a heat generation difference value;(S180) Spray a fuel by correcting a fuel spray time, a spray pressure, and a spay amount based on a fuel spraycorrection value, when a diesel engine is operated normally
Abstract:
본 발명은 차량의 운행 조건, 연료 분사량 조건 및 흡입 공기량 조건을 만족하는지 여부를 판단하고, 실시간으로 측정되는 공기량과 연소압센서에서 측정되는 연소압과의 상관식을 도출하여 그 기울기와 y절편을 모니터링 하며, 상기 기울기와 y절편이 기설정된 정상수준에 속하는지 여부를 판단하여, 정상수준의 범위를 벗어난 경우 그 횟수를 누적시켜 설정된 센서 이상 누적검출 횟수에 해당하게 되면 경고를 출력하는 것을 특징으로 하는 연소압센서의 이상상태 판단 시스템 및 방법에 관한 것으로서, 본 발명에 의하면 연소압센서의 열화 등 이상상태를 신뢰성 있게 검출함으로써 연소압 기반 연소제어의 정밀성을 향상시킬 수 있는 효과가 있다.
Abstract:
PURPOSE: An EGR(Exhaust Gas Recirculation) valve, an EGR control system using the same, and a method thereof are provided to control back pressure and the amount of LP-EGR(Liquefied Petroleum-Exhaust Gas Recirculation) simultaneously and to sufficient LP-EGR, thereby improving fuel efficiency by reducing the back pressure. CONSTITUTION: An EGR valve(10) comprises a rotary shaft(20), an EGR flap(30), an exhaust flap(40), and a motor. The rotary shaft is installed in an edge portion where an EGR passage and an exhaust pipe are crossed. The EGR and exhaust flaps are mounted respectively in both sides of the rotary shaft and formed into one plate(60) by being mutually connected. A stopper(70) is installed in the EGR passage or in the inner circumference of the exhaust pipe so that a leak of the EGR flap is prevented and the maximum opened degree of the EGR flap is controlled.
Abstract:
PURPOSE: A knocks control system and a method thereof are provided to improve exhausting performance by setting a targeted value with a predicted knocks generation amount according to driving situation and by controlling discharge of knocks in a direction capable of reducing the discharge of the knocks. CONSTITUTION: A knocks generation amount is predicted by using a virtual sensor. A predicted knocks value is compared with a predetermined knocks target value. The knocks generation amount is controlled so that the predicted knocks value follows the knocks target value(S30). [Reference numerals] (AA) NOx prediction; (BB) Predicted NOx value