| 摘要 |
<p>A nurse vehicle carries a supply of chemicals or fertilizer in fluid form for being applied to a crop and/or field by using a sprayer vehicle. A coupler assembly for selectively connecting a fluid transfer conduit of the nurse vehicle to a sprayer vehicle fluid intake conduit includes a receptacle connected to the transfer conduit, and a complementary dimensioned insert dimensioned for being received in the receptacle. An inflatable seal surrounds the insert and locks the insert and receptacle together when inflated. Flow of fluid through the insert and receptacle is respectively controlled by first and second poppet valves, which are normally spring biased to closed positions preventing flow through the bodies. An extensible and retractable valve actuator is provided for selectively opening the poppet valves. An electronic controller embodies sequencing logic and once armed, acts in response to a coupled signal to sequentially cause the seal to inflate, the valve actuator to open the poppet valves, and a variable displacement pump to ramp-up to being pumping the fluid being transferred, thereafter the controller acts in response to a full tank signal to sequentially cause the pump displacement to ramp-down to zero displacement, the valve actuator to close the poppet valves and the inflatable seal to deflate, thereby placing the coupler assembly in a condition for being separated. The electronic controller also is used in conjunction with a pump condition monitoring arrangement to control the displacement of the pump for maximizing pump operation while avoiding cavitation.</p> |
