Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-10-30
1980-05-27
Brigance, Gerald
Communications: electrical
Condition responsive indicating system
Specific condition
340661, 340664, 361159, G08B 2100
Patent
active
042053072
ABSTRACT:
A first amplifier measures the instantaneous voltage across a resistor, connected in series with the electromagnet of a solenoid valve, as the current increases following energization of the electromagnet. A second amplifier measures the same voltage and stores the peak value in a capacitor. The two measured voltages are applied to a comparator which detects the difference, and generates an output, when operation of the electromagnet armature causes a transient reduction in the resistor voltage. Initial energization of the electromagnet sets a memory and starts a monostable timing period. The set output of the memory primes one input of an AND gate, the second input being inhibited by the monostable output during timing. If the electromagnet armature operates normally, the comparator output resets the memory and removes the AND gate priming signal prior to completion of the timing period. If the armature fails to operate the monostable output following the timing period completes the actuation of the AND gate to produce a fault signal.
REFERENCES:
patent: 3028587 (1962-04-01), Vaccaro
patent: 3103653 (1963-09-01), Schultz et al.
patent: 3125271 (1964-03-01), Marshall
patent: 3275899 (1966-09-01), De Wolf
patent: 3678344 (1972-07-01), Wedmore
patent: 3740615 (1973-06-01), Vigini
patent: 3911360 (1975-10-01), Kimzey
patent: 4065758 (1977-12-01), Barbier et al.
Liermann Peter
Weise Lutz
Brigance Gerald
McIntire, Jr. R. W.
WABCO Westinghouse GmbH
Williamson, Jr. A. G.
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