Trouble diagnosing device of control circuit system
First Claim
1. In a control system, a trouble diagnosing device for diagnosing trouble in a control circuit or in an actuator wherein said control circuit receives an input signal representative of information about a controlled means which is controlled by the actuator and transmits controlling indicia to the actuator for controlling the operation of the controlled means;
- said trouble diagnosing device comprising;
a modulation signal means for feeding to the input side of the control circuit a trouble diagnosing signal having such a narrow pulse width that the actuator is not able to respond thereto, said trouble diagnosis signal being independent of the input signal related to the controlled means;
input signal modulator means for modulating the input signal related to the controlled means by the trouble diagnosing signal to produce a modulation signal; and
a trouble diagnosing circuit means for producing output signals indicating trouble in the control circuit or in the actuator when the control circuit or the actuator receives the modulation signal from said input signal modulator and in response thereto emits a signal having other than a predetermined waveform.
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Accused Products
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.
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Citations
10 Claims
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1. In a control system, a trouble diagnosing device for diagnosing trouble in a control circuit or in an actuator wherein said control circuit receives an input signal representative of information about a controlled means which is controlled by the actuator and transmits controlling indicia to the actuator for controlling the operation of the controlled means;
- said trouble diagnosing device comprising;
a modulation signal means for feeding to the input side of the control circuit a trouble diagnosing signal having such a narrow pulse width that the actuator is not able to respond thereto, said trouble diagnosis signal being independent of the input signal related to the controlled means; input signal modulator means for modulating the input signal related to the controlled means by the trouble diagnosing signal to produce a modulation signal; and a trouble diagnosing circuit means for producing output signals indicating trouble in the control circuit or in the actuator when the control circuit or the actuator receives the modulation signal from said input signal modulator and in response thereto emits a signal having other than a predetermined waveform. - View Dependent Claims (8)
- said trouble diagnosing device comprising;
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2. In a trouble diagnosing device of a control system for receiving, as input signals, detection signals formed by detecting conditions of controlled means which are representative of the conditions of said controlled means, and for feeding after logical operation to actuator means as output signals, control signals for actuating the actuator means so as to properly control the operations of the controlled means,
said trouble diagnosing device comprising: -
modulator means for modulating said detection signals by a modulation signal having a trouble diagnosing discrimination waveform; first circuit means for producing a discrimination waveform signal including a discrimination waveform which starts at the starting point of the discrimination waveform of the modulation signal produced by said modulator means and ends at the starting point of the discrimination waveforms of the control signal occurring as the detection signals are modulated by said modulator means; second circuit means for producing a discrimination waveform signal including a discrimination waveform which is present as long as at least one of the control signals and said discrimination signal produced by said first circuit means is forming a discrimination waveform; and alarm means for raising an alarm when said discrimination waveform signal produced by said second circuit means keeps forming continuously the discrimination waveform over a predetermined period of time. - View Dependent Claims (5, 6, 7, 9, 10)
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3. In a trouble diagnosing device of a control system for receiving, as input signals, detection signals formed by detecting conditions of controlled means, and for feeding after logical operation to a plurality of actuator means, as output signals, control signals for actuating the actuator means so as to perperly control, in cooperation with one another, the operation of the controlled means,
said trouble diagnosing device comprising: -
modulator means for modulating the detection signals by a modulation signal having a trouble diagnosing discrimination waveform; first circuit means for producing a discrimination waveform signal including a discrimination waveform which is present when the control signals fed to the actuator means all have discrimination waveforms; second circuit means for producing a discrimination waveform signal including a discrimination waveform which starts at the starting point of the discrimination waveform of the modulation signal produced by said modulator means and ends at the starting points of the discrimination waveform of the output signal of said first circuit means occurring when the detection signals are modulated by said modulator means; third circuit means for producing a discrimination waveform signal including a discrimination waveform which is present as long as at least one of the control signals and the discrimination waveform signal produced by said second circuit means is forming a discrimination waveform; and alarm means for raising an alarm when the discrimination waveform signal produced by said third circuit means keeps forming continuously the discrimination waveform over a predetermined period time.
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4. In a trouble diagnosing device of a multiple control system provided independently to a plurality of controlled means, for receiving, as input signals, detection signals formed by detecting conditions of the respective controlled means and thus representative of the conditions of the controlled means, and for feeding after logical operation, as output signals, control signals to a plurality of actuator means at least one of which is provided to each of the controlled means so as to properly control the operations of the controlled means,
said trouble diagnosing device comprising: -
modulator means for modulating the detection signals by a modulation signal having a trouble diagnosing discrimination waveform; first circuit means for producing a discrimination waveform signal including a discrimination waveform which is present only when all of the control signals fed to the actuator means form discrimination waveforms; second circuit means for producing a discrimination waveform signal including a discrimination waveform which starts at the starting point of the discrimination waveform of said modulation signal produced by said modulator means and ends at the starting point of the discrimination waveform of the output signal of said first circuit means occurring when the detection signals are modulated by said modulator means; third circuit means for producing a discrimination waveform signal including a discrimination waveform which is present as long as at least one of the control signals and the discrimination waveform signal produced by said second circuit means is forming the discrimination waveform; and alarm means for raising an alarm when the discrimination waveform signal produced by said third circuit means keeps forming continuously the discrimination waveform over a predetermined period of time.
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Specification