Abstract: An electronic rate meter controller is provided for controlling the dispensing of meterable material by an applicator apparatus, typically in the agricultural area. The rate meter controller retrofits a manually-controllable rate meter within the applicator apparatus that controls the rate of material flow through the applicator by adjustment to a primary control member of the rate meter, such as a rotary calibration dial. The rate meter controller allows for automatic electronic control and adjustment to the rate meter by the primary control member, based on user inputs and certain sensor inputs. Typical sensor inputs include speed of the applicator apparatus as it is being moved while dispensing the metered material, and ambient air temperature which affects the applicator system pressure for certain materials such as anhydrous ammonia. The rate meter controller also allows for manual electronic remote control of the rate meter, such as from a cab of a vehicle moving the applicator apparatus.

Abstract: Method and apparatus for dispensing a liquid agricultural agent at a desired rate. A source of the liquid is pressurized and passed in parallel though at least one regulating capillary tube of such diameter and length as to regulate the rate of dispensing of the liquid at the desired rate. A pressure of the liquid is sensed and controlled for the purpose of adjusting the above-mentioned flow rate. A flow rate of the liquid is sensed and used with the sensed pressure to detect and alert a user of possible problems in the system, such as clogging of a dispensing outlet. A ground speed of the farm tractor which is transporting the system can he sensed in order to calculate the appropriate flow rate. A geographical location a farm machine in order to facilitate "prescription farming". The liquid may be injected and mixed with a carrier, and the mixing can be done in close proximity to an outlet orifice.

Abstract: A fluid delivery control system is provided for controlling a fluid delivery system to deliver a fluid under pressure at a target flow rate. In a hybrid mode, the preferred fluid delivery control system is responsive to signals from a pressure sensor and a flowmeter. Primary feedback control is provided using the sensed pressure from the pressure sensor, and the sensed flow rate from the flowmeter is utilized to provide compensation for the pressure responsive feedback control and to provide accurate measurements of flow rate and total flow for the fluid delivery system. The preferred fluid delivery control system is also capable of operating in flowmeter and pressure modes which are only responsive to signals from a flowmeter and a pressure sensor, respectively. In the preferred embodiment, the fluid delivery control system is utilized in a mobile sprayer system for applying an agent over a surface.