专利名称：Program controlled irrigation system发明人：Laurence R. Nicholson申请号：US07/566192申请日：19900810公开号：US05293554A公开日：19940308
摘要：A program controlled irrigation system (10) operates with two programs.Program A and Program B, for irrigating a plurality of zones. Selected zones are
dedicated to the irrigation of grass, for example, under Program A while other zones arededicated to the irrigation of shrubs, for example, under Program B. A total of six timesfor starting an irrigation cycle are available for both Programs A and B. Under programcontrol, the six starting times can be allocated in any combination to Programs A and B.Further, starting times can be shifted readily between Programs A and B therebyproviding flexibility to meet the changing demands in grass and shrub irrigation. Eachzone is constantly monitored for overcurrent conditions wherein zone operation isterminated if the overcurrent of the particular zone is sustained beyond a set period.Also, if the current reaches an excessive level in a very short period, zone operation isterminated. Even though a single zone operation has been terminated as noted above,other zones can continue to operate unless the operation of two successive zones hasbeen terminated whereupon the operation of the entire system 10 is terminated.
申请人：NICHOLSON; LAURENCE R.
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