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1. 发明授权

US5033293A Alcohol concentration detecting device 失效
标题翻译：酒精浓度检测装置
公开(公告)号：US5033293A
公开(公告)日：1991-07-23
申请号：US491175
申请日：1990-03-09
申请人： Masahiro Honma , Fumio Hagi , Yukihiro Niide , Takenosuke Sano , Koji Iwahashi
发明人： Masahiro Honma , Fumio Hagi , Yukihiro Niide , Takenosuke Sano , Koji Iwahashi
IPC分类号： G01N27/22 , G01N33/28
CPC分类号： G01N33/2852 , G01N27/221
摘要： An alcohol concentration detecting device is disclosed, which comprises an alcohol sensor of capacitance type having a probe portion which is to be submerged in an alcohol-mixed fuel, the alcohol sensor issuing an output signal which varies in accordance with the concentration of alcohol in the alcohol-mixed fuel; a first oscillating circuit which receives the output signal of the alcohol sensor and issues a variable pulse signal whose duty ratio is variable in accordance with the output signal; a second oscillating circuit which issues a reference pulse signal, the reference pulse signal being the same as the pulse signal which is provided by the first oscillating circuit when there is no alcohol in the fuel; and an alcohol concentration detecting circuit which receives and compares the variable pulse signal and the reference pulse signal and issues an alcohol concentration representing signal which is variable in accordance with a difference in duty ratio between the variable pulse signal and the reference pulse signal.
摘要翻译：公开了一种酒精浓度检测装置，其包括电容型酒精传感器，其具有要浸没在醇混合燃料中的探针部分，所述醇传感器发出根据酒精浓度变化的输出信号酒精混合燃料; 第一振荡电路，其接收所述醇传感器的输出信号，并发出其占空比根据所述输出信号而变化的可变脉冲信号; 发出参考脉冲信号的第二振荡电路，所述参考脉冲信号与在所述燃料中不存在醇时由所述第一振荡电路提供的脉冲信号相同; 以及酒精浓度检测电路，其接收并比较可变脉冲信号和参考脉冲信号，并发出根据可变脉冲信号和参考脉冲信号之间的占空比的差异可变的酒精浓度表示信号。

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