Vaporized fuel processing apparatus

摘要

A vaporized fuel processing apparatus has a closing valve provided in a vapor path connecting an adsorbent canister to the fuel tank, a pressure sensor configured to detect the inner pressure of the fuel tank, and an electric control unit configured to determine whether the amount of increase in the inner pressure of the fuel tank is within an acceptable range or not, to learn a valve opening start position of the closing valve when the inner pressure of the fuel tank is reduced by an amount not less than a predetermined value, and to stop or prohibit the learning of the valve opening start position of the closing valve when the amount of increase in the inner pressure of the fuel tank is not within the acceptable range during or before the learning of the valve opening start position of the closing valve.

主权项

1. A vaporized fuel processing apparatus comprising:
a canister capable of adsorbing vaporized fuel generated in a fuel tank; a vapor path connecting the canister and the fuel tank to each other; a closing valve provided in the vapor path and having a valve seat and a valve movable portion, the valve movable portion having an axis and being capable of moving in an axial direction of the valve movable portion respect to the valve seat, the closing valve being in a valve closing state capable of maintaining the fuel tank in a hermetic state when a stroke amount which is an axial distance between the valve movable portion and the valve seat is within a predetermined range as from zero; a pressure sensor configured to detect inner pressure of the fuel tank; and an electric control unit configured to:
determine whether an amount of increase in the inner pressure of the fuel tank is within an acceptable range;learn a valve opening start position of the closing valve based on the stroke amount when the inner pressure of the fuel tank is reduced by an amount greater than or equal to a predetermined value through increasing the stroke amount; andstop or prohibit the learning of the valve opening start position of the closing valve when the amount of increase in the inner pressure of the fuel tank is not within the acceptable range during or before the learning of the valve opening start position of the closing valve.