US Patent 7571674 Automatic coffee brewing apparatus and control method

This invention provides for a coffee brewing apparatus and its control method, which comprises a control circuit and a water loop comprising a water reservoir, a pump, a control valve, a boiler, a brewing assembly, a three-way connector and a connecting hose. When coffee is to be brewed, hot water flows top-down through the brewing chamber cover, the upper filter, the coffee grounds, the lower filter, the brewing chamber, the first port of the three-way connector, the second port of the three-way connector and the connecting hose; the brewed coffee finally flows out from said connecting hose. This coffee brewing apparatus has additional functions of automatic residue discharge, automatic water discharge and automatic cleaning.