| 摘要 |
An electronically controlled water closet including a bowl, a flush tank, a first solenoid valve for draining the flush tank, a second solenoid valve for admitting water to refill the flush tank, a power circuit for connecting the first and second valves to a current source, the power circuit including first and second electronic switches, respectively, for operating the first and second valves, and a control circuit for sequencing the first and second switches. The control circuit, which may include an electronic timer, may be selectively variable to control the amount of water used during the flushing cycle. A third electronic switch is provided for breaking the power circuit to keep the valves closed when a failure mode exists, and the preferred control circuit includes a logic circuit arrangement for establishing a circuit condition effective to operate the said third switch when a failure mode exists.
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