Patent ID: 8038091

Claim:
A fan control apparatus comprising: a fan that is rotary driven by being supplied with a fluid and generates a propulsion force of a flying object; two or more fluid supply units that supply the fluid to the fan; an abnormality detection unit that detects abnormalities in the fluid supply units; and a control unit that controls a control variable relating to flight of the flying object, wherein when the abnormality detection unit detects an abnormality in any of the fluid supply units, the control unit determines whether a predetermined time has elapsed since the abnormality was detected, and if the control unit determines that the predetermined time has not elapsed, the control unit controls, by a control gain, the control variable relating to the flight of the flying object to be lower than that established before the abnormality detection unit has detected the abnormality, the control being continued until a state is assumed in which the fluid supply unit, for which the abnormality detection unit has not detected an abnormality, can supply the fluid at a flow rate necessary for the fan to generate a propulsion force that has been attained before the abnormality detection unit has detected the abnormality, and wherein the control gain is lower than that established before the abnormality detection unit has detected the abnormality.