Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1979-02-09
1981-09-29
Miller, J. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361187, 361 31, H02H 0308, F02B 0308
Patent
active
042926580
ABSTRACT:
In order to prevent dangerous operation of machinery, for example excessive speeds in internal combustion engines upon electrical failure in the fuel management system or associated sensors, the current passing through the electromagnetic final control element which engages the fuel control rod is monitored. In normal operation of the final control element, when the armature is displaced, a back EMF opposes the applied voltage, thereby reducing the effective current. Accordingly, a jammed armature and similar malfunctions will produce increased current through the final control element. The threshold of a threshold response switch is set to lie between these two values of the current, whereby, when the armature is jammed or short circuits occur, the current will rise above the threshold and permit fuel shut-off or a switchover to mechanical fuel control. Another embodiment of the invention monitors the output voltage of a position transducer associated, for example, with the fuel control rod of the engine and initiates emergency procedures when the signal departs from its nominal range in one direction.
REFERENCES:
patent: 4176626 (1979-12-01), Norimatsu et al.
Greigg Edwin E.
Miller J. D.
Robert & Bosch GmbH
Schroeder L. C.
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