Hydraulic control system for weighing

Claim 1

A refuse collection vehicle having an hydraulically operated lift assembly including at least one lift arm associated therewith for lifting and emptying a refuse container, and a weighing system for weighing the refuse container loaded and after being emptied into a receptacle means of the refuse collection vehicle, said hydraulically operated lift assembly including a lift cylinder for moving said lift arm, a lift circuit for conveying hydraulic fluid under pressure to operate the lift cylinder and a lowering circuit for releasing hydraulic fluid from the lift cylinder to lower the lift arm; the weighing system including a proximity switch means and activator means capable of activating the proximity switch at a reference position and at a weighing position of the lift arm, said proximity switch electrically communicating with a signal means activated at either of said two said positions, said weighing system further including an hydraulic bypass control system tapping off from the lift circuit of the lift assembly, said bypass control system including a transducer means, a remote control valve means being normally closed, and a return line means for returning bypassed hydraulic fluid to the lowering circuit of the lifting assembly, said transducer means electrically communicating with an analog/digital converter means for converting transducer-generated analog signals corresponding to the fluid pressure on the transducer means.