Abstract: A system for maintaining constant pressure, such as at a mosquito fogging nozzle, by electronically controlling the speed of an engine that is coupled to a blower. A pressure sensor measures the pressure provided by the blower and provides a pressure signal to the electronic engine controller. The engine controller is of the proportional-integral (PI) type and utilizes pulse-width modulation (PWM) techniques to control an electromechanical actuator attached to the throttle of the engine to vary the engine speed. Constant pressure is maintained despite changes in the ambient temperature, humidity and barometric pressure. A safety circuit prevents engine over-speed if the pressure signal is lost. An over-speed circuit monitors and controls the engine speed at higher RPMs.

Abstract: A system for maintaining constant pressure, such as at a mosquito fogging nozzle, by electronically controlling the speed of an engine that is coupled to a blower. A pressure sensor measures the pressure provided by the blower and provides a pressure signal to the electronic engine controller. The engine controller is of the proportional-integral (PI) type and utilizes pulse-width modulation (PWM) techniques to control an electromechanical actuator attached to the throttle of the engine to vary the engine speed. Constant pressure is maintained despite changes in the ambient temperature, humidity and barometric pressure. A safety circuit prevents engine over-speed if the pressure signal is lost. An over-speed circuit monitors and controls the engine speed at higher RPMs.

Abstract: A combination ultra-low volume aerosol generator and thermal fogger for dispensing a mosquito killing insecticide includes a power source which may be a gasoline driven engine and an air pump connected to the power source. The air pump drives a turbine pump which has a rotatable turbine wheel. There is a fluid pump connected to and driven by rotation of the turbine wheel. An insecticide formulation tank is connected to the fluid pump and provides insecticide to an atomizing nozzle and a thermal fog muffler and fog discharge. There is a flow selector valve connected to the fluid pump to determine which discharge device receives fluid insecticide. There is a volume control valve connected between the fluid pump and the flow selector valve.

Abstract: A portable dust or aerosol dispenser has a motor-driven air compressor operable to supply compressed air to a coiled hose. A hand-operated valve assembly connected to the hose is selectively attached to a duster unit or an aerosol unit. The duster unit has container storing dust and a nozzle connected to a siphon tube to carry dust from the container and discharge the dust, along with air, to a desired location. The aerosol unit has a container storing a liquid and a nozzle assembly connected to a siphon tube to draw liquid from the container, break up the liquid in small particles and discharge the particles with a stream of air to a desired location.