Patent ID: 9676371
Date: 2017-06-13
CPC Classifications: B60S,F16K

Claim:
1. A product metering system for accurately metering a product to be dispensed, comprising: a vehicle wash adapted for washing a vehicle, wherein said vehicle wash includes a first pump fluidly connected to a product supply, wherein said product supply is comprised of a liquid; an electronic control valve fluidly connected to said first pump, wherein said electronic control valve operates at an open/close ratio that dispenses said product supply at a flow rate, wherein said open/close ratio is comprised of an on state for an on period of time and an off state for an off period of time, wherein said open/close ratio produces a consistent flow rate of said product supply; a product dispenser fluidly connected to said electronic control valve to dispense said product supply to said vehicle; and a control unit in communication with said electronic control valve, said control unit programmed to control said open/close ratio, wherein said control unit calculates said open/close ratio needed to produce said flow rate of said product supply utilizing a pressure of said product supply from said first pump; wherein said on state is comprised of an initial higher power applied to said electronic control valve for a period of high power time to ensure that said electronic control valve is opened followed by a lower power applied to said electronic control valve for a period of lower power time; wherein said initial higher power is comprised of a constant voltage; wherein said period of high power time is comprised of approximately 15 ms; wherein said lower power is comprised of a pulse width modulated power; wherein said period of lower power time is based on a desired product flow rate; wherein said off state is comprised of no power applied to said electronic control valve.