Modified null flow modulator

Details Modified null flow modulator Modified null flow modulator

1985-07-15

1987-05-05

Jordan, Charles T.

Aeronautics and astronautics

Missile stabilization or trajectory control

Automatic guidance

F42B 15033

Patent

active

046625810

ABSTRACT:
A method of pulse-width modulation for operating oppositely aligned thrus valves of an integrated valve assembly in an aerospace post-boost control system in which zero average thrust during a modulation period is provided by commanding the thruster valves to be simultaneously on for a selected portion of the modulation period and simultaneously off for the rest of the modulation period. Non-zero average thrust is provided by varying the simultaneous operation of the thruster valves established for zero average thrust by commanding an increased on-time for one thruster valve while commanding a correspondingly decreased on-time for the other thruster valve, the excursions in on-time and in off-time occurring around the zero-thrust turn-on time or the zero-thrust turn-off time.

REFERENCES:
patent: 3612442 (1971-10-01), Chisel
patent: 4550888 (1985-11-01), Douglass et al.

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