A fluid distribution system and method for mobile applications. The system includes a power source, a pump driven by the power source, and a motor driven by the pump. The system also includes a spray head with a fluid inlet passage, a fluid outlet passage, a fluid piston disposed in a chamber for co
A fluid distribution system and method for mobile applications. The system includes a power source, a pump driven by the power source, and a motor driven by the pump. The system also includes a spray head with a fluid inlet passage, a fluid outlet passage, a fluid piston disposed in a chamber for controlled access between the inlet and outlet passages and defining a variable orifice, and a hydraulic cylinder controllably engaged to the orifice. The fluid piston and the hydraulic cylinder are aligned with a common longitudinal axis, and the inlet passage is offset from the axis in a direction opposed to the location of the outlet passage.
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1. A fluid distribution system, comprising: a power source;a pump driven by the power source;a motor driven by the pump; anda spray head configured to receive fluid from a fluid source driven by the motor, the spray head including; a fluid inlet passage;a fluid outlet passage;a fluid piston disposed
1. A fluid distribution system, comprising: a power source;a pump driven by the power source;a motor driven by the pump; anda spray head configured to receive fluid from a fluid source driven by the motor, the spray head including; a fluid inlet passage;a fluid outlet passage;a fluid piston disposed in a chamber for controlled access between the inlet and outlet passages and defining a variable orifice; anda double acting hydraulic cylinder connected to the fluid piston and configured to control movement of the fluid piston to vary a size of the orifice, thereby varying a flow rate of fluid output from the outlet passage;wherein the fluid piston and the hydraulic cylinder are aligned with a common longitudinal axis, and the inlet passage is offset from the axis in a direction opposed to the location of the outlet passage. 2. A fluid distribution system, as set forth in claim 1, wherein the motor is a variable displacement motor, and a displacement of the motor is controllable to adjust a pressure of fluid delivered to the spray head. 3. A fluid distribution system, as set forth in claim 2, further comprising: a ground speed sensor configured to sense a ground speed of the fluid distribution system;a fluid pressure sensor configured to sense a pressure of fluid delivered to the spray head; anda controller connected to the ground speed sensor and the fluid pressure sensor, the controller being configured to: receive the sensed ground speed and the sensed pressure,control the displacement of the motor, andcontrol operation of the double acting hydraulic cylinder to vary the size of the orifice. 4. A fluid distribution system, as set forth in claim 3, wherein the spray head includes a plurality of independently controllable spray heads. 5. A fluid distribution system, as set forth in claim 1, wherein the variable orifice is a continuously variable orifice. 6. A fluid distribution system, as set forth in claim 1, wherein the power source includes a prime mover for a mobile machine. 7. A fluid distribution system, as set forth in claim 6, wherein the prime mover includes an engine drivingly connected to the mobile machine and a transmission driven by the engine. 8. A fluid distribution system, as set forth in claim 7, wherein the pump is a hydraulic pump driven by one of the engine and the transmission. 9. A method for distributing a fluid, the method comprising the steps of: determining a ground speed of a mobile machine configured for fluid distribution;determining a pressure of fluid being delivered to a spray head having a variable orifice, the spray head comprising a double acting hydraulic cylinder;comparing the determined pressure to a desired fluid pressure;controlling a variable displacement motor to maintain the desired fluid pressure based on the comparison; andcontrolling a size of the variable orifice during operation as a function of the ground speed and independent of fluid pressure to vary a flow rate of fluid output from the spray head to maintain a desired distribution of fluid. 10. A method, as set forth in claim 9, wherein controlling the size of the variable orifice includes the step of controlling sizes of a plurality of orifices on a corresponding plurality of spray heads. 11. A method, as set forth in claim 10, wherein controlling sizes of a plurality of orifices includes the step of controlling the sizes of the plurality of orifices independent of each other. 12. A method, as set forth in claim 9, further including the steps of: determining a condition associated with a location for fluid distribution;determining a desired fluid pressure as a function of the condition;controlling the variable displacement motor to maintain the desired fluid pressure; andcontrolling the variable orifice as a function of the ground speed and as a further function of the determined condition to maintain the desired distribution of fluid. 13. A method, as set forth in claim 12, wherein determining a condition includes the step of determining a level of dryness associated with the location. 14. A spray head for a fluid distribution system, comprising: a fluid inlet passage;a fluid outlet passage;a fluid piston disposed in a chamber for controlled access between the inlet and outlet passages and defining a variable orifice; anda double acting hydraulic cylinder connected to the fluid piston and configured to control movement of the fluid piston to vary a size of the orifice, thereby varying a flow rate of fluid output from the outlet passage;wherein the fluid piston and the hydraulic cylinder are configured to move along a central longitudinal axis, and the inlet passage is offset from the axis in a direction opposed to the location of the outlet passage. 15. A spray head, as set forth in claim 14, further including at least one fluid deflector connected to the spray head and configured to control a fluid distribution pattern from the outlet passage. 16. A spray head, as set forth in claim 15, wherein the at least one fluid deflector is configured to control a laminar fluid distribution pattern from the outlet passage. 17. A spray head, as set forth in claim 14, wherein the hydraulic cylinder includes: a hydraulic piston having a head end and a rod end;a rod connecting the hydraulic piston to the fluid piston;a first hydraulic port positioned to allow hydraulic fluid in the hydraulic cylinder at the rod end; anda second hydraulic port positioned to allow hydraulic fluid in the hydraulic cylinder at the head end. 18. A spray head, as set forth in claim 17, wherein the hydraulic cylinder further includes a spring disposed in the hydraulic cylinder at the head end. 19. A spray head, as set forth in claim 14, wherein the hydraulic cylinder is fluidically isolated from the chamber. 20. The spray head, as set forth in claim 14, wherein the fluid piston is movable to adjust a degree of opening of the variable orifice. 21. The fluid distribution system of claim 1, wherein the spray head includes a housing defining the inlet passage, the outlet passage, and the chamber in which the fluid piston is disposed. 22. The fluid distribution system of claim 1, wherein the inlet passage is generally parallel to the axis and the outlet passage is generally perpendicular to the inlet passage. 23. The fluid distribution system of claim 1, wherein the pump is a variable displacement pump, and a displacement of the pump is controllable to adjust a pressure of fluid delivered to the spray head. 24. The fluid distribution system of claim 1, wherein: the pump is a variable displacement pump;the motor is a variable displacement motor; anddisplacements of the pump and the motor are controllable to adjust a pressure of fluid delivered to the spray head. 25. The method of claim 9, further comprising controlling movement of a fluid piston of the spray head to control the size of the variable orifice, the fluid piston providing controlled access between a fluid inlet passage and a fluid outlet passage of the spray head. 26. The fluid distribution system of claim 16, wherein the at least one fluid deflector includes an opening through which flow from the outlet passage passes, and the opening of the at least one fluid deflector is at least as large as the size of the orifice.
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