Hydraulic control system for refuse collection vehicle
OwnerFarooq A. Khan, Kosti Shivanianinventors
Life of this patent
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Abstract
A front loading refuse vehicle includes at least one positive displacement pump having an associated valve system in fluid communication with drive mechanism that operates a lifting arm, packer, a rear door of the vehicle, and a hoist for a refuse storage body. The valve system includes at least one closed-centered valve with a spool mechanism having a pressure compensator to maintain a constant flow rate of fluid through the valve regardless of differential in pressure across the valve for any given position of the spool mechanism. Two pumps with two separate hydraulic control systems are used with a side loading refuse vehicle. An electrical/electronic control system including a microprocessor operates the valve systems for each vehicle.
Claims18
A refuse vehicle including
- a lifting arm mounted to the vehicle that moves between a lowered position and a raised position,
- a refuse storage body that moves between a lowered position and a raised position,
- said refuse storage body having a rear door that moves between a closed position and an open position,
- a packer in the refuse storage body that moves between an extended and a retracted position,
- drive mechanisms connected to the lifting arm, refuse storage body, rear door, and packer that move the arm, body, rear door, and packer between respective ones of said positions,
- a hydraulic valve system that operates the drive mechanisms, said valve system including a plurality of valves having spool mechanisms moveable to different positions in response to electronic actuation devices to adjust the speed and direction of movement of the drive mechanisms,
- sensors that detect the positions of the lifting arm, refuse storage body, rear door, and packer, said sensors generating electrical signals corresponding to said respective detected positions, and
- an electrical/electronic control system including
- electronic actuation devices that, in response to said electrical signals, operate the drive mechanisms and
- a microprocessor programmed to control the movement of the spool mechanisms to adjust the speed and direction at which the drive mechanisms move.
Dependencies are inferred from the claim text.