Method of operating a fuel tank isolation valve

Abstract

A method of operating a fuel tank isolation valve. The fuel tank isolation valve has a first port, a second port, an electric actuator, and a valve body. The first port is in fluid communication with a fuel vapor collection canister. The second port is in fluid communication with a fuel tank. And the electric actuator moves the valve body to control fluid communication between the first and second ports. The method includes supplying a first electric signal to the electric actuator such that the valve body permits substantially unrestricted fuel vapor flow between the first and second ports, supplying a second electric signal to the electric actuator such that the valve body substantially prevents fuel vapor flow between the first and second ports, and supplying a third electric signal to the electric actuator such that the valve body provides restricted fuel vapor flow between the first and second ports.

Dependencies are inferred from the claim text.