Abstract:
본 발명은 디젤-가솔린 혼합 연소가 이루어지는 엔진의 연소 제어 방법에 관한 것으로서, 디젤-가솔린 혼합 연소가 이루어지는 엔진에서 고부하 운전 영역에서의 노킹 문제 및 저부하 운전 영역에서의 착화 불안정성 문제를 개선할 수 있는 연소 제어 방법 및 장치를 제공하는데 주된 목적이 있는 것이다. 상기한 목적을 달성하기 위해, 디젤과 가솔린 연료의 혼합 연소가 이루어지는 혼합 연소 모드와, 가솔린 연료만을 연소시키는 가솔린 연소 모드를 갖는 엔진의 연소 제어 방법에 있어서, 혼합 연소 모드와 가솔린 연소 모드 중 엔진의 현 운전 상태에 따른 연소 모드를 판단하는 단계; 엔진의 현 운전 상태에 따른 연소 모드에 해당하는 압축비를 결정하는 단계; 가변 압축비 장치의 작동을 제어하여 실린더의 압축비를 상기 결정된 압축비로 제어하는 단계; 상기 압축비로의 제어 후 연소 동안 구해지는 엔진의 연소 상태가 연소 안정성을 확보하기 위한 설정된 조건을 만족하는지를 판단하는 단계; 및 상기 설정 조건을 만족시키지 않으면 연소압 센서 신호를 피드백 신호로 하여 설정 조건을 만족하도록 가변 압축비 장치를 통한 압축비 보정을 수행하는 단계;를 포함하는 혼합 연소 모드를 갖는 엔진의 연소 제어 방법, 및 이를 구현하는 연소 제어 장치를 제공한다.
Abstract:
PURPOSE: A structure for mounting an injector is provided to reduce amount of pollution generated in low speed driving area of an engine. CONSTITUTION: An injector mounting part(22) of a cylinder head is chamber-processed to form an inclined surface(24) with conic shape. The inclined surface is formed during casting process of the cylinder head, or separately processed. The inclined surface of the cylinder head in which a nozzle(32) of an injector(30) is placed is processed to be conically shaped to prevent collision of fuel against the cylinder head when the fuel is injected from a nozzle hole(34) of the injector. Protrusion of the nozzle is about 1.1mm, which is smaller than usual 1.6mm about by 0.5mm. Stable output and pollution quality are allowed in low speed driving area of an engine thereby as fuel injected through the nozzle hole of the injector from colliding against a lower side of the cylinder head, and protrusion of the nozzle is reduced.
Abstract:
PURPOSE: A combustion chamber for a common rail injection system is provided to apply high injection pressure at the low speed region and realize the output improvement with the efficient combustion. CONSTITUTION: A combustion chamber for a common rail injection system is characterized in that the high injection pressure is applied at the low speed, the diameter of the combustion chamber is enlarged to inhibit sprays from colliding with a wall surface, the spray is performed to prevent the spray superposition and combustion deterioration due to the high swirl flow intensity comparing with the spraying property at the low speed so that the swirl intensity decreases at the upper dead point, the depth of the combustion chamber is small to maintain the volume of the combustion chamber and compression ratio, and the spraying angle of an injector is made to be large.
Abstract:
PURPOSE: A mixed combustion engine using diesel and gasoline, a control method thereof, and a complex ignition type combustion system are provided to improve cold start performance as the system is ignited by a spark plug in a low load area. CONSTITUTION: Complex ignition type combustion system comprises a cylinder block(10), a spark plug(12), a diesel injector(13), and an electronic control unit(30). The cylinder block comprises a plurality of cylinders(11), and each cylinder is connected to intake(21) and exhaust manifolds. The spark plug and the diesel injector are placed in the cylinder. The electronic control unit sucks air to the cylinder if an operation zone is in a high load area, and performs compression ignition by spraying diesel to the diesel injector. The electronic control unit sucks mixed gas into the cylinder if the operation area is in a low load area, and performs spark ignition. The electronic control unit performs the compression ignition by spraying the diesel to an diesel injector if the operation area is between the high and low load areas.
Abstract:
PURPOSE: A combustion chamber for a common rail injection system is provided to apply high injection pressure at the low speed region and realize the output improvement with the efficient combustion. CONSTITUTION: A combustion chamber for a common rail injection system is characterized in that the high injection pressure is applied at the low speed, the diameter of the combustion chamber is enlarged to inhibit sprays from colliding with a wall surface, the spray is performed to prevent the spray superposition and combustion deterioration due to the high swirl flow intensity comparing with the spraying property at the low speed so that the swirl intensity decreases at the upper dead point, the depth of the combustion chamber is small to maintain the volume of the combustion chamber and compression ratio, and the spraying angle of an injector is made to be large.