초록 ▼

A fuel dispenser having a filter status sensor includes a fuel delivery path for delivering fuel from a station storage tank to a vehicle; a fuel filter in the delivery path for filtering fuel flowing in the delivery path; a flow monitor in the delivery path for measuring fuel flow in the delivery p

A fuel dispenser having a filter status sensor includes a fuel delivery path for delivering fuel from a station storage tank to a vehicle; a fuel filter in the delivery path for filtering fuel flowing in the delivery path; a flow monitor in the delivery path for measuring fuel flow in the delivery path; and a controller associated with the flow monitor adapted to determine and compare a first flow rate taken during a first cycle with a second flow rate taken during a second cycle. The controller provides a filter status signal when the first and second flow rates differ by more than a predetermined difference indicative of an unclean fuel filter.

대표청구항 ▼

[ What is claimed is:] [39.] A method for providing a filter status signal associated with a fuel dispenser having a fuel delivery path, a filter along the delivery path and a flow monitor providing a flow signal representative of a quantity of fuel flow to the computer, said method comprising:gener

[ What is claimed is:] [39.] A method for providing a filter status signal associated with a fuel dispenser having a fuel delivery path, a filter along the delivery path and a flow monitor providing a flow signal representative of a quantity of fuel flow to the computer, said method comprising:generating a flow signal representative of a quantity of fuel flow during a plurality of fueling operations;determining current flow rates based on the quantity of fuel flow per unit of time;comparing the current flow rate with a first maximum flow rate value stored in a first memory location during a first cycle;storing the current flow rate in the first memory location if the current flow rate is greater than the first maximum flow rate value stored in said first memory location during the first cycle;comparing the current flow rate with a second maximum flow rate value stored in a second memory location during a second cycle;storing the current flow rate in the second memory location if the current flow rate is greater than the second maximum flow rate value stored in the second memory location during the second cycle;comparing the first maximum flow rate value and the second maximum flow rate value after the first and second cycles; andproviding a filter status signal when the first and second maximum flow rate values differ by more than a predetermined difference.