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US 9,804,055 B2Granted
Engine overspeed detection circuit and method
AssigneePyroban Limited
InventorNigel Tester
Life of this patent
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Abstract
An engine over speed detection circuit for determining an engine over speed condition is described. The circuit includes a detection unit configured to send a pulsed signal indicative of engine speed; a reactive impedance configured to discharge upon receipt of a pulse of the pulsed signal at a rate defined by the pulsed signal; a comparator unit to compare a voltage or current value of the reactive impedance with a threshold value and to output the result of the comparison at the rate of the pulsed signal.
Claims15
An engine over speed detection circuit comprising:
- a detection unit configured to send a pulsed signal indicative of engine speed;
- a reactive impedance configured to discharge upon receipt of a pulse of the pulsed signal at a rate defined by the pulsed signal;
- and
- a comparator unit to compare a voltage or current value of the reactive impedance with a threshold value and to output a result of the comparison at the rate of the pulsed signal,
- wherein the comparator unit comprises three comparators mutually connected in parallel, each comparator of the three comparators having a first input terminal connected to the reactive impedance and a second input terminal connected to a resistor divider chain,
- wherein the resistor divider chain determines the threshold value for each comparator, and
- wherein the resistor divider chain is connected to a buffered variable voltage source comprising an electrically adjustable potentiometer connected to resistors.
4 more elements
An engine over speed detection method comprising the steps of:
- sending a pulsed signal indicative of engine speed;
- discharging a reactive impedance upon receipt of a pulse of the pulsed signal at a rate defined by the pulsed signal;
- comparing, via a comparator unit, a voltage value or a current value of the reactive impedance with a threshold value;
- and
- outputting a result of the comparison at the rate of the pulsed signal,
- wherein the comparator unit comprises three comparators mutually connected in parallel, each comparator of the three comparators having a first input terminal connected to the reactive impedance and a second input terminal connected to a resistor divider chain,
- wherein the resistor divider chain determines the threshold value for each comparator, and
- wherein the resistor divider chain is connected to a buffered variable voltage source comprising an electrically adjustable potentiometer connected to resistors.
5 more elements
Dependencies are inferred from the claim text.