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1. 发明授权

US4408289A Simplified monitoring apparatus for sensors in motor vehicles 失效
标题翻译：汽车传感器简化监控装置
公开(公告)号：US4408289A
公开(公告)日：1983-10-04
申请号：US218343
申请日：1980-12-22
申请人： Bernward Boning , Rainer Bone , Rudolf Nagel , Jens-Detlef Rubrecht
发明人： Bernward Boning , Rainer Bone , Rudolf Nagel , Jens-Detlef Rubrecht
IPC分类号： G01D3/08 , G01L23/22 , G01R23/15 , H03K5/20
CPC分类号： G01L23/225 , G01D3/08 , G01R23/15
摘要： The leading edge of each pulse of an incoming signal sequence starts a first monostable multivibrator whose period is equal to the period of the pulse sequence when the pulse sequence has the desired frequency. The input signal sequence and the output signal from the multivibrator are applied to two inputs of an exclusive OR gate. The latter furnishes an output signal corresponding to the difference in pulse width between the signal applied to the two inputs. The leading edge of the difference signal then starts a second monostable multivibrator whose pulse width corresponds to the maximum allowable frequency deviation. The output signal of the second monostable multivibrator is applied to an inverting input of an AND gate. The direct input of the AND gate receives the difference signal. The AND gate, therefore, only furnishes an output signal when the difference signal has a greater pulse width than the output signal of the second multivibrator, i.e. when the frequency deviation in the incoming signal sequence exceeds the maximum permissible frequency deviation.
摘要翻译：输入信号序列的每个脉冲的前沿启动第一单稳态多谐振荡器，其周期等于当脉冲序列具有期望频率时脉冲序列的周期。来自多谐振荡器的输入信号序列和输出信号被施加到异或门的两个输入。后者提供对应于施加到两个输入的信号之间的脉冲宽度差的输出信号。然后，差分信号的前沿开始第二个单稳态多谐振荡器，其脉冲宽度对应于最大允许频率偏差。第二单稳态多谐振荡器的输出信号被施加到与门的反相输入端。与门的直接输入接收差分信号。因此，与门相比，当差分信号具有比第二多谐振荡器的输出信号更大的脉冲宽度时，即当输入信号序列中的频率偏差超过最大允许频率偏差时，才提供输出信号。

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