Establishing synthesis validity between two signal sources

Details Establishing synthesis validity between two signal sources Establishing synthesis validity between two signal sources

1984-12-20

1988-01-26

Lall, Parshotam S.

Boots, shoes, and leggings

218564, 364187, G05B 903, G06F 1546

Patent

active

047220619

ABSTRACT:
In an electronic engine control (EEC) for a turbine engine, a high rotor speed signal (N2SYNTH) is synthesized from a sensed low rotor speed signal (N1) in a primary control channel (32) so long as the low rotor speed signal is healthy. If the low rotor speed signal (N1) is not healthy, the primary channel is reconfigured (FIG. 3) so that a low rotor speed signal (N1SYNTH) is synthesized from a sensed high rotor speed signal (N2).
A secondary control channel 34 provides standby signals for use in the EEC and performs similar logic as in the primary channel, except that signal synthesis (N2 from N1 and vice-versa) is dependent upon N2 health. When the high rotor speed signal (N2) is healthy, a low rotor speed signal (N1SYNTH) is synthesized from a sensed high rotor speed signal (N2). When the high rotor speed signal (N2) is not healthy, a high rotor speed signal (N2SYNTH) is synthesized from a sensed low rotor speed signal (N1).
For each of the low and high rotor speeds, redundant signals (N1A, N1B and N2A, N2B, respectively) are available. Primary sensors (10A, 24A) for low and high rotor speeds (N1A, N2A) serve the primary channel, secondary sensors (10B, 24B) for low and high rotor speeds (N2A, N2B) serve the secondary channel, and cross-channel communication is via a link (39).

REFERENCES:
patent: 4032757 (1977-06-01), Eccles
patent: 4209734 (1980-06-01), Osden
patent: 4327437 (1982-04-01), Gelderloos
patent: 4437154 (1984-03-01), Eisele et al.
patent: 4494207 (1985-01-01), Chang et al.

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