FUEL TANK SYSTEM

摘要

A fuel tank system, includes: a fuel tank internally storing fuel; a canister in which vaporized fuel generated in the fuel tank is adsorbed and desorbed by an adsorbent, and open to the atmosphere by an atmosphere communication pipe; a purging pipe placing an engine in communication with the canister; a vent pipe placing the fuel tank in communication with the canister; a negative pressure pump provided at the atmosphere communication pipe, and causing negative pressure to act on the fuel tank from the canister; and a negative pressure open/close valve provided at the vent pipe, maintaining an open state at a pressure difference between a negative pump pressure acting from the negative pressure pump and a tank internal pressure acting from the fuel tank, and closing at a pressure difference between a negative purging pressure acting from the engine and the tank internal pressure acting from the fuel tank.

主权项

1. A fuel tank system, comprising:
a fuel tank that internally stores fuel; a canister in which vaporized fuel generated in the fuel tank is adsorbed and desorbed by an adsorbent, and that is open to the atmosphere by an atmosphere communication pipe; a purging pipe that places an engine in communication with the canister; a vent pipe that places the fuel tank in communication with the canister; a negative pressure pump that is provided at the atmosphere communication pipe, and that causes negative pressure to act on the fuel tank from the canister; and a negative pressure open/close valve that is provided at the vent pipe, that maintains an open state at a pressure difference between a negative pump pressure acting from the negative pressure pump and a tank internal pressure acting from the fuel tank, and that closes at a pressure difference between a negative purging pressure acting from the engine and the tank internal pressure acting from the fuel tank.