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FFT를 이용한 노킹판단 기준값의 자동수정 알고리즘 개발
강성현(S.H.Kang),장광수(K.S.Chang),서정인(J.I.Seo),전광민(K.M.Chun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
The purpose of knocking control is to avoid knock occurrence while minimizing fuel efficiency loss and engine torque loss. The actual knock control is performed by retarding and advancing spark timing near maximum brake torque or knock limit based on knock measurements exceeding the knock threshold value predetermined appropriately. However the threshold value should not be constant throughout the engine life due to the engine aging and characteristics distinction.<br/> In this paper, a new knocking control algorithm was developed using the knock threshold value auto-correction algorithm. This algorithm uses the Fast Fourier Transform (FFT) method by measuring cylinder block vibration signals of a 1498 cc four-cylinder spark ignition engine. The experimental results show the proposed knock control algorithm provides improved performance compared to the existing method. The results also show that the proposed FFT algorithm provides real-time adjustment of the knock threshold value.<br/>