| 摘要 |
PROBLEM TO BE SOLVED: To accurately predict the time of run-out of a detergent when the refill is announced in a bathtub washing system for washing a bathtub by spraying the detergent for the amount of use determined for each of a plurality of washing modes into the bathtub from a detergent tank. SOLUTION: The average quantity A of the detergent to be used for one washing of the bathtub is computed based on the number of times of bathtub washing and the quantity of the detergent used in a prescribed period (S501). When the detergent remaining inside the detergent tank is reduced to a reference quantity A, the possible number of times of bathtub washing with the reference quantity of the remaining detergent is computed by dividing the reference quantity of the remaining detergent by the average quantity A of the used detergent (S502), and the time of run-out of the detergent is predicted based on the possible number of times of bathtub washing. COPYRIGHT: (C)2009,JPO&INPIT
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