Patent ID: 9648991
Date: 2017-05-16
CPC Classifications: A47K

Claim:
1. A control method for an electronic liquid dispenser, wherein the liquid dispenser utilizes a motor to drive a pump mechanism from a home position in a dispense cycle for dispensing a metered dose of liquid from a reservoir, the motor powered by a voltage source, the method comprising: upon initiation of the dispense cycle, starting the motor to operate the pump mechanism; calculating motor work being performed by the motor immediately after motor start; upon the calculated motor work immediately after motor start exceeding a first set point work value during initiation of the dispense cycle, stopping and reversing the motor to return the pump mechanism to the home position; during the subsequent dispense cycle, separately detecting motor voltage and motor current; and upon the calculated motor work being greater than a second set point work value and less than the first set point work value, stopping and reversing the motor to return the pump mechanism to the home position when (a) detected voltage fails below a set point voltage value or (b) detected current exceeds a set point current value.