Evaporative emission control system

摘要

An evaporative emission control system includes a fuel tank, a canister, a normally-closed control valve, a filler pipe, and a breather pipe. The fuel tank is to store fuel. The canister is to adsorb evaporative fuel generated in the fuel tank. The normally-closed control valve is provided in a vapor passage connecting the fuel tank to the canister. The fuel is delivered to the fuel tank through the filler pipe. The breather pipe includes a communicating passage, an opening, and at least one hole. The communicating passage connects the fuel tank to the filler pipe. The opening is provided at a first end of the breather pipe in the fuel tank. The opening is located below a predetermined fuel level in the fuel tank. The at least one hole is located above the predetermined fuel level in the fuel tank.

主权项

1. An evaporative emission control system comprising:
a fuel tank to store fuel; a canister to adsorb evaporative fuel generated in the fuel tank; a normally-closed control valve provided in a vapor passage connecting the fuel tank to the canister, the normally-closed control valve being configured to open such that evaporative fuel flows in the canister when fuel is delivered to the fuel tank, the fuel tank including a float valve provided at an opening of the vapor passage, the float valve being configured to block the opening of the vapor passage when fuel stored in the fuel tank reaches a predetermined fuel level; a filler pipe through which the fuel is delivered to the fuel tank; and a breather pipe comprising:
a communicating passage connecting the fuel tank to the filler pipe;an opening provided at a first end of the breather pipe in the fuel tank, the opening being located below the predetermined fuel level in the fuel tank; andat least one hole located above the predetermined fuel level in the fuel tank to release evaporative fuel from the at least one hole in a state where the normally-closed control valve is closed, wherein the float valve is configured to move into a closed state to block the opening of the vapor passage when the opening at the first end of the breather pipe is located below a liquid level of the fuel in the fuel tank, and wherein the at least one hole is a circular hole provided on the breather pipe to release the evaporative fuel in the fuel tank via the circular hole when the float valve is in the closed state.