Automatic dual flush activation

摘要

A multi flush volume flush valve is in communication with an automatic flush control. The flush control determines the presence of a user and the amount of time the user uses the toilet. The usage time is compared to a predetermined time value to determine the appropriate flush volume based on an assumption regarding usage time and flush volume needs. The comparative value statistically adjusts to the restroom traffic.

主权项

1. A method for controlling the flush volume of a flush valve, comprising the steps of:
detecting the presence of a user; initiating a usage timer upon detection of the user; stopping the usage timer upon the cessation of detection of the presence of the user, thereby generating a usage time tx representing elapsed time; comparing the usage time tx to an average usage time tp or, if tp does not exist, to a preset usage time Tp; selecting a flush volume to be used for a flush event based on the comparison, and if Tp was used for the comparison, averaging Tp and tx to generate average usage time tp; if tp was used for the comparison, averaging tp and tx to generate a new average usage time which becomes tp.