CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE AND KNOCK JUDGEMENT METHOD

• Main Authors: MATOHARA SHINYA, AKAGI YOSHIHIKO
• Format: Patent
• Language: English; Japanese
• Published: 11.01.2018
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MECHANICAL ENGINEERING; PHYSICS; TESTING; WEAPONS

PROBLEM TO BE SOLVED: To improve accuracy in knock judgement at an internal combustion engine.SOLUTION: This invention has a feature comprising: a knock frequency filter processing part 202 for extracting a knock frequency band that is a specific frequency band to a knock; a disturbance noise filter processing part 204 for extracting a disturbance noise frequency band that is a frequency band specific to the disturbance noise; a knock frequency correcting part 206 for calculating a strength ratio difference that is an influence degree of the disturbance noise frequency at a disturbance noise frequency band extracted by the disturbance noise filter processing part 204 in respect to the knock frequency at the knock frequency band extracted by the knock frequency filter processing part 202, determining a correction counted number of the knock frequency band strength on the basis of the strength ratio difference, and correcting the knock frequency band strength in reference to the correction counted number; and a judgement processing part 208 for judging whether or not a knock is produced on the basis of the corrected knock frequency band strength.SELECTED DRAWING: Figure 3 【課題】内燃機関におけるノック判定の精度を向上させることを課題とする。【解決手段】ノックに特有の周波数帯であるノック周波数帯を抽出するノック周波数フィルタ処理部２０２と、外乱ノイズに特有の周波数帯である外乱ノイズ周波数帯を抽出する外乱ノイズフィルタ処理部２０４と、ノック周波数フィルタ処理部２０２が抽出したノック周波数帯におけるノック周波数に対する、外乱ノイズフィルタ処理部２０４が抽出した外乱ノイズ周波数帯における外乱ノイズ周波数の影響度である強度比率差分を算出し、この強度比率差分を基に、ノック周波数帯強度の補正計数を決定し、補正計数によって、ノック周波数帯強度を補正するノック周波数補正部２０６と、補正されたノック周波数帯強度を基に、ノッキングが発生しているか否かを判定する判定処理部２０８と、を有することを特徴とする。【選択図】図３