Abstract:
본 발명은 하나의 기통에 장착된 연소압 센서로부터 검출된 연소압 신호와 타엔진 특정 인자를 통해 연소압 센서가 장착되지 않은 다른 기통의 연소 위상 정보를 획득함으로써 모든 기통에 대한 연소 위상을 예측하는 장치 및 방법을 제공하는 것이다. 본 발명은 엔진 각 기통별 폭발 행정시 최대 엔진 각가속도 지점을 계산하는 단계; 연소압 센서 장착 기통의 연소 위상을 검출하는 단계; 연소압 센서 장착 기통의 연소 위상과 최대 엔진 각가속도 지점의 시간차를 계산하는 단계; 그리고 상기 연소압 센서 장착 기통의 시간차와 상기 연소압 센서 미장착 기통의 최대 엔진 각가속도 지점을 이용하여 연소압 센서 미장착 기통의 연소 위상을 예측하는 단계;를 포함할 수 있다.
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 method for determining the malfunctions of sensors, wherein the method comprises a step of determining whether the driving state a vehicle satisfies a condition for detecting the malfunctions of the sensors; a step of calculating the common physical properties of the sensors as targets to be determined; a step of comparing the calculated physical properties; a step of determining whether the compared physical properties are within a predetermined range; and a step of outputting a malfunction signal when the compared physical properties are not within the predetermined range.
Abstract:
Disclosed are a method for determining the misfire of a vehicle engine, and a method and an apparatus for controlling the misfire of a vehicle engine. The method for determining the misfire of a vehicle engine is as follows. The combustion pressure of a combustion chamber of an engine is sensed during the operation of the engine. A mass fraction of burning rate (MFB), a half of mass fraction of burning rate (MFB50), an MFB50 coefficient of variation (MFB50 COV), an indicated mean effective pressure (IMEP), and an IMEP coefficient of variation (IMEP COV) are calculated using the combustion pressure. A target MFB is set. The misfire is determined if the crank angle is changed 5 degrees or more, the MFB50 COV is 20% or more, or IMEP COV is 20% or more when comparing the MFB40 calculated in the calculation step with the target MFB. Spray timing is advanced so that the MFB reaches the target MFB.
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: 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
Abstract:
PURPOSE: A knocks generation estimation method is provided not to include additional sensor and to estimate the amount of knocks generation in real time through a simple calculation based on fuel amount of a vehicle, the number of engine rotation, an air fuel ratio, and ERG information. CONSTITUTION: A no generation rate is calculated by using an engine combustion pressure and an engine driving variable. The engine combustion pressure is used in order to calculate a no generation period. The no generation rate is calculated from the no generation rate and the no generation period. A NO2 generation amount is calculated from a ratio of NO and NO2 according to an engine driving section and a NO generation amount in order to predict a knocks generation amount. [Reference numerals] (210) Fuel amount; (AA) Calculation