APPARATUS FOR CONTROLLING SPEED OF INTERNAL COMBUSTION ENGINE

• Main Authors: IKEDA, HIROSHI, NAKAI, KAZUHIRO, TAKASU, YASUHITO, KAWAI, KATSUHIKO
• Format: Patent
• Language: English; Korean
• Published: 15.01.1999
• Edition: 6
• Subjects: BLASTING; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; CONTROLLING COMBUSTION ENGINES; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MECHANICAL ENGINEERING; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGULATING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

본 발명은 엔진용 회전수 제어장치에 관한 것으로, 아이들링 상태에 있을 때 흡입공기량을 엔진에 제어하는 공기량 제어장치와, 실제 엔진 아이들 회전수를 토대로 공기량 제어장치의 제어량을 결정하는 회전수 제어장치가 장비되어 있다. 엔진아이들 회전수를 제어하기 위해, 상기 장치는 엔진의 동적모델의 내부상태를 대표하는 상태변수량으로 공기량 제어장치의 제어량과 엔진의 점화회로의 점화시기 제어량을 출력시키는 상태변수량 출력부와, 목표회전수와 실제 엔진 아이들 회전수간의 편차를 누적시키는 회전수 편차누적부와, 목표 점화시기와 실제 점화시기간의 편차를 누적시키는 점화시기 편차누적부를 포함한다. 공기량 제어장치의 제어량과 점화시기 제어량은 동적모델, 상태변수량, 회전수 편차누적치 및 점화시기 편차누적치를 토대로 미리 결정된 공기시스템 및 점화시스템의 최적 피드백 이득을 토대로 산출된다. 이러한 구성은 오브저버를 이용하지 않고 공기량 및 점화시기를 동시에 제어하므로써 엔진회전수를 쉽게 목표회전수에 제어한다. A speed control apparatus for an engine which is equipped with an air quantity control device for controlling an intake air quantity to the engine when being in an idling state and a speed control device for determining a control amount of the air quantity control device on the basis of the actual engine idle speed. For controlling the engine idle speed, the apparatus comprises a state variable outputting section for outputting the actual engine idle speed, the control amount of the air quantity control device and an ignition timing control amount of an igniter of the engine as state variables representing an internal state of a dynamic model of the engine, a speed deviation accumulating section for accumulating a deviation between the target speed and the actual engine idle speed, and an ignition timing deviation accumulating section for accumulating a deviation between a target ignition timing and the actual ignition timing. The control amount of the air quantity control device and the ignition timing control amount are calculated on the basis of optimal feedback gains of an air system and an ignition system predetermined on the basis of the dynamic model, the state variables, the speed deviation accumulated value and the ignition timing deviation accumulated value. This arrangement can simultaneously control the air quantity and the ignition timing without using an observer to easily control the engine idle speed to the target speed.