Patent ID: 6662787
Filing Date: 2003-12-16
Classification: F02D,F02M

Abstract:
A device for monitoring a fuel/air ratio of a mixture of air and fuel vapour being fed from the an outlet (34) of a fuel vapour accumulator (3), wherein the fuel vapour accumulator (3) receives a fuel vapour coming from a tank (7) at an inlet (3a), and wherein the fuel vapour accumulator (3) is provided with air at an air inlet (3b) the fuel vapour accumulator (3) feeding at the outlet (34) the mixture of air and fuel vapour, the outlet (34) leading to an intake manifold (12) and to an engine (13), the device comprising:electronic calculating means (16) for receiving and calculating, said electronic calculating means receiving as an input at least information of a flow rate of air Qa aspirated into said accumulator (3), said electronic calculating means calculating a flow rate of air QaÂ° which would be fed at the outlet from said accumulator (3) in the absence of fuel vapour coming from said accumulator (3), said electronic calculating means further calculating a percentage (p) of fuel vapour fed from the outlet of said accumulator, said percentage (p) of fuel vapour calculated on the basis of said flow rate of air Qa and said flow rate of air QaÂ°.