Floor maintenance machine

1. A method of maintaining a floor by applying fluid thereto, said method comprising:

discharging a diluting fluid from a first reservoir to a mixing apparatus, the first reservoir being a gravity-feed reservoir;

discharging a cleaner concentrate from a second reservoir to the mixing apparatus with a selectively on pump;

mixing the discharged diluting fluid and cleaner concentrate to form a cleaning solution;

continuously identifying changes in fluid levels within the first reservoir with a level sensor;

providing a first signal indicative of an identified change in fluid level in the first reservoir;

passing the cleaner concentrate and diluting fluid through a flow control device for discharge therefrom;

and

processing the first signal to generate an output signal and controlling operation of the pump and the flow control device in response to the output signal to provide a uniform flow of fluid to a cleaning device at a substantially constant ratio of the diluting fluid from the first reservoir to the cleaner concentrate from the second reservoir for substantially all fluid levels of the first reservoir.

2. The method of claim 1 , wherein the flow control device includes an on/off valve.

3. The method of claim 2 , wherein the pump comprises a positive displacement pump.

4. The method of claim 3 , wherein the pump pumps cleaning chemical into a conduit system on a predetermined controlled basis.

5. The method of claim 4 further comprising accumulating valve open time over a plurality of valve open cycles to effect controlled flow rates of fluids from the first and second reservoirs and activating a pump on cycle only if the valve is on.

6. The method of claim 1 , wherein the flow control device includes a pump.