Control system for automatic vehicle wash

摘要

A "roll over" type vehicle wash apparatus includes a frame which is movable on a track and which is driven between a front end and a rear end of the track. The apparatus includes a pair of front arms and a pair of rear arms which are pivotally connected to the frame. Side wrap brushes are rotatably connected to each of the front and rear arms and are rotated about vertical axes. A control circuit for automatically controlling operation of the apparatus includes five sequence control relays, FRONT IN and REAR IN switches for sensing side wrap brush position, a TOP BRUSH DOWN switch for sensing top brush position, and a HOME TRAVEL switch for sensing frame position on the track. The control circuit prevents both the front and rear arms from being fully in at the same time, thereby preventing a dangerous condition from occurring when very short vehicles are being washed.