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1. 发明授权

US5347846A Knocking detecting device for internal combustion engine and method therefor 失效
标题翻译：内燃机爆震检测装置及其方法
公开(公告)号：US5347846A
公开(公告)日：1994-09-20
申请号：US847691
申请日：1992-03-06
申请人： Kouji Kitano , Mitsuo Kayano , Masayoshi Kaneyasu , Kouzou Katougi , Takanobu Ichihara , Nobuo Kurihara
发明人： Kouji Kitano , Mitsuo Kayano , Masayoshi Kaneyasu , Kouzou Katougi , Takanobu Ichihara , Nobuo Kurihara
IPC分类号： F02B77/08 , F02D45/00 , F02P5/152 , F02P5/153 , G01L23/22
CPC分类号： G01L23/225
摘要： Knocking detecting in an internal combustion engine uses, a vibration sensor detecting engine vibrations; and insert for taking-in output vibration signals from the vibration sensor in a plurality of intervals in a time sequential manner during every explosion stroke of the internal combustion engine; performing a digital frequency analysis on the taken-in output vibration signals in the respective sequential intervals; setting a main resonance frequency necessary for knocking occurrence judgement based upon the instant operating condition of the internal combustion engine; calculating knocking indexes for the digital frequency-analyzed output vibration signals in the respective sequential intervals based upon the set main resonance frequency component; comparing the largest knocking index calculated with a predetermined threshold value determined by a background vibration level and a slice level thereof to determine occurrence of knocking; and renewing the respective background vibration levels using the calculated knocking indexes when no knocking occurrence is determined. With such an operation a knocking detection with a high S/N ratio and a high sensitivity is achieved.
摘要翻译：在内燃机中的敲击检测使用振动传感器检测发动机振动; 并且在内燃机的每次爆炸冲程期间以时间顺序的方式插入来自振动传感器的多个间隔的输入振动信号; 对各个顺序区间内的输入输出振动信号进行数字频率分析; 基于内燃机的即时运行状态设定爆震发生判定所需的主共振频率; 基于设定的主共振频率分量计算各个顺序间隔中的数字频率分析输出振动信号的敲击指数; 比较由由背景振动水平确定的预定阈值和其切片水平计算的最大敲击指数，以确定爆震的发生; 并且当没有确定爆震发生时，使用所计算的敲击指数更新各自的背景振动水平。通过这样的操作，实现了具有高S / N比和高灵敏度的爆震检测。

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