COMBUSTION ABNORMALITY DETECTION DEVICE, COMBUSTION ABNORMALITY DETECTION METHOD, AND PROGRAM

To enhance piezoelectric detection accuracy, and to improve misfire detection accuracy.SOLUTION: A combustion abnormality detection device includes a charge amplifier 210 for outputting a voltage signal in correspondence with an electrical charge generated by a piezoelectric element 35 in accordance with a received pressure, a drift component extraction section 230 for extracting a drift component of the piezoelectric element 35, a drift correction section 250 for generating a correction signal for removing the drift element on the basis of the extracted drift element and feeding back the correction signal to an input side of the charge amplifier 210, and a misfire detection section 400 for detecting a misfire on the basis of the correction signal.SELECTED DRAWING: Figure 15 【課題】圧電検出精度を高めて失火検出精度を向上する。【解決手段】受圧に応じて圧電素子３５により生起された電荷に対応する電圧信号を出力するチャージアンプ２１０と、圧電素子３５のドリフト成分を抽出するドリフト成分抽出部２３０と、抽出されたドリフト成分に基づいて、当該ドリフト成分を除去するための補正信号を生成し、チャージアンプ２１０の入力側にフィードバックするドリフト補正部２５０と、補正信号に基づいて、失火検出を行う失火検出部４００とを備える。【選択図】図１５