초록 ▼

A fuel vapor emission control system for an automobile includes a fuel filler pipe, a filler cap, a check valve, a fuel tank, a carbon canister or other vapor storage device, a reservoir, and a vapor tube for conducting fuel vapor from one or more tank vent valves located on the fuel tank. The syste

A fuel vapor emission control system for an automobile includes a fuel filler pipe, a filler cap, a check valve, a fuel tank, a carbon canister or other vapor storage device, a reservoir, and a vapor tube for conducting fuel vapor from one or more tank vent valves located on the fuel tank. The system reduces the amount of vapor mass which exits the fuel tank to the carbon canister by condensing some of the vapor sent to the canister during refueling. Fuel entering the filler pipe is used as a condensing agent. The system also reduces the amount of vapor pumped to the vapor storage device during diurnal cycles by permitting the volume of the fuel tank to change in response to changes in pressure within the tank.

대표청구항 ▼

[ I claim:] [1.] A fuel vapor emission control system for an automotive vehicle, comprising:a filler pipe mounted between a fuel entry port and a fuel tank inlet;a filler cap which seals the fuel entry port during nonfueling operation;a fuel tank which receives fuel from filler pipe outlet;a vapor t

[ I claim:] [1.] A fuel vapor emission control system for an automotive vehicle, comprising:a filler pipe mounted between a fuel entry port and a fuel tank inlet;a filler cap which seals the fuel entry port during nonfueling operation;a fuel tank which receives fuel from filler pipe outlet;a vapor tube for conducting fuel vapor from one or more tank vent valves located on an upper wall of the fuel tank, with said vapor tube passing through (in thermal contact with) the fuel filler pipe such that fuel entering the fuel tank through the filler pipe impinges upon the vapor tube and absorbs heat from vapor flowing within the vapor tube, with said vapor tube being further connected to an evaporative emissions control canister;a reservoir connected with said vapor tube, for collecting condensed fuel from said vapor tube, with said reservoir further comprising a return line for returning said condensate to said fuel tank; anda feed line extending between the vapor tube and an onboard refueling vapor recovery carbon canister, with said feed line conveying uncondensed displaced vapor to the canister.