Communications: electrical – Selective – Having indication or alarm
Patent
1979-07-17
1981-09-01
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
303 92, B60T 1722
Patent
active
042875056
ABSTRACT:
A trouble diagnosing device of a control circuit for receiving, as input signals, signals containing information on controlled means and producing, as output signals, control signals for controlling the controlled means on the basis of the input signals, includes modulator means for modulating the input signals by means of a modulation signal having a trouble diagnosing discrimination waveform, and a trouble diagnosing circuit for producing an output signal indicating trouble in the control circuit system when the output signals of said control circuit systems produced upon receipt of the input signals modulated by the modulator means, contain an abnormal signal.
In an embodiment of the invention, the modulator means modulate input signals by means of a trouble diagnosing modulation signal having such a small pulse width that electromagnetic actuators for controlling the controlled means are not able to respond thereto.
In another embodiment of the invention, the trouble diagnosing circuit is equipped with a circuit for producing a discrimination waveform signal solely depended on the starting points of the discrimination waveforms of the modulation signals and on the starting points of the discrimination waveforms of the control signals so that trouble in the control circuit system having various waveform signals can be diagnosed without being restricted by waveforms subsequent to the starting points of the modulation signals and control signals.
REFERENCES:
patent: 4047149 (1977-09-01), Akita et al.
patent: 4085979 (1978-04-01), Leiber et al.
patent: 4106820 (1978-08-01), Ruhnau et al.
Ohmori Taiji
Sato Makoto
Tsuchiya Yoshikazu
Honda Giken Kogyo Kabushiki Kaisha
Waring Alvin H.
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