Safety-related parameter inputs for microprocessor ignition controller
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United States of America Patent
Stats
-
Oct 16, 1990
Grant Date -
N/A
app pub date -
Sep 1, 1988
filing date -
Sep 1, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control circuit for controlling the ignition time of a control system for a gas-fired combustion air heating appliance comprising a set of potentiometers and a controller for detecting failures in the control circuit. The set of potentiometers are used together to select the ignition time of the control system. The potentiometers are set to produce analog input signals which, when converted to digital signals, have a predetermined complementary relationship (such as one's or two's complement). The controller is connected to the set of potentiometers and includes an analog-to-digital converter which receives the analog input signals from the set of potentiometers and converts them into digital signals. The controller compares or analyzes the digital signals derived from the first and second potentiometers to detect failures in the control circuit and halts operation of the control system if the digital signals do not have the predetermined complementary relationship.
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