Patent ID: 7941280
Filing Date: 2011-05-10
Classification: F02D,F02M,Y02T

Abstract:
1. A method for checking functionality of a tank ventilation valve of a tank ventilation system of a motor vehicle, wherein an adsorbing filter including a vent pipe is connected to a fuel tank over a first filter line and connected to the tank ventilation valve over a second filter line, and wherein the tank ventilation valve is further connected to an inlet manifold of a combustion engine that provides an actuator for an idle mode over a valve pipe, the method comprising: measuring a mass flow that flows through the tank ventilation valve in an idle mode of the combustion engine; measuring a mass flow that flows through the actuator in the idle mode; calculating a correlation coefficient between a variation of the mass flow that flows through the tank ventilation valve and a variation of the mass flow that flows through the actuator for the idle mode; and determining an operational status of the tank ventilation valve from the calculated correlation coefficient.