초록 ▼

The present invention is a variable blending dispenser for fluids, particularly for fuel dispensers. The dispenser controls variable valves according to volumetric data observed by flow meters on input lines to the dispenser, by calculating measuring error as the difference between desired blend rat

The present invention is a variable blending dispenser for fluids, particularly for fuel dispensers. The dispenser controls variable valves according to volumetric data observed by flow meters on input lines to the dispenser, by calculating measuring error as the difference between desired blend ratio and the observed blend ratio calculated from volumes of blend components dispensed. The dispenser successively corrects the settings of the valves after dispensing predetermined volumes, the corrections determined by a volume based PID error function so that the total amount of each blend component is separately and accurately measured while providing the desired blend ratio.

대표청구항 ▼

A dispenser for blending component fluids according to a desired cumulative blend ratio, said dispenser comprising: a plurality of fluid conduits, each said fluid conduit coupled to one of at least two supplies of component fluid to be dispensed therefor; a variable valve means coupled to each said

A dispenser for blending component fluids according to a desired cumulative blend ratio, said dispenser comprising: a plurality of fluid conduits, each said fluid conduit coupled to one of at least two supplies of component fluid to be dispensed therefor; a variable valve means coupled to each said fluid conduit for independently controlling the flow rate at which each said component fluid flows through said respective fluid conduits; a flow meter means operatively associated with said fluid conduits for measuring the volume of said component fluid flowing through each said fluid conduit and for providing volume signals representative of said volumes; an output means coupled to each said fluid conduit for mixing and dispensing said component fluids; and control means for controlling the blending and dispensing of said component fluids, said control means coupled to said flow meter means and said valve means, said control means including selecting means for selection of said desired cumulative blend ratio and comparison means for comparing a calculated ratio of said volume signals with said desired cumulative blend ratio and for determining a corrected blend ratio, said control means further including adjustment means for adjusting said variable valve means in accordance with said corrected blend ratio such that the actual cumulative blend ratio of dispensed component fluids is substantially equal to said desired cumulative blend ratio.