Failsafe electronic control systems
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 12, 1988
Grant Date -
N/A
app pub date -
Sep 30, 1986
filing date -
Oct 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
For flight safety reasons in gas turbine aeroengines it is desireable that in the event of malfunction of an electronic control system--such as a fuel control system--caused, for example, by overheating due to fire, the control system should protect the engine and the aircraft against the consequences of such a malfunction. In the present invention this is achieved by arranging that the control system is provided with a failsafe unit which monitors the condition of the control system and puts the engine into a failsafe control mode if a control system condition signal generated by the failsafe unit varies beyond a predetermined limit. Thus, to ensure safety under overheating conditions, the control system condition signal is representative of the temperature experienced by the fuel control system and the failsafe control mode is a speed-limiting control mode. Specific control mode sequences and corresponding control unit takeover ranges and constructions are disclosed which are effective to ensure that any control system failures have safe predictable results.
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