Patent ID: 6939110
Filing Date: 2005-09-06
Classification: F04D,Y02B

Abstract:
1. Apparatus for maintaining constant pressure in a spraying system, said apparatus comprising: a spraying nozzle, an engine with a throttle to vary the speed of the engine, a throttle control mechanism coupled to the throttle to vary the position of the throttle, a blower coupled to the engine to provide gaseous pressure to the spraying nozzle, a pressure sensor disposed near the spraying nozzle to measure the pressure developed by the blower and to generate a pressure signal related to the pressure, and an engine controller coupled to the throttle control mechanism, said engine controller receiving said pressure signal from the pressure sensor, said engine controller using the pressure signal to generate a control signal to the throttle control mechanism to control the position of the throttle, thereby varying engine speed to maintain the constant pressure at the pressure sensor near the nozzle wherein said engine controller is of the proportional-integral type with a proportional control channel and an integral control channel.