Patent ID: 7690364
Filing Date: 2010-04-06
Classification: F02D

Abstract:
1. A method for determining an additive correction value for correcting the quantity of fuel injected in an internal combustion engine, wherein in the tank ventilation system a tank ventilation valve is disposed in a regeneration line, which connects a retention vessel collecting fuel gas from a fuel tank to an intake pipe of the internal combustion engine, the method comprising the steps of: sealing off the tank ventilation system in an airtight manner from the atmosphere prevailing outside the motor vehicle, opening the tank ventilation valve to build up a negative pressure in the tank ventilation system, determining the loading of the retention vessel with fuel gas, determining the volume flow through the tank ventilation valve, calculating an intermediate value from the product of loading and volume flow, determining a tank pressure difference between the pressure in the fuel tank and the atmospheric pressure, and determining the additive correction value by adjusting the intermediate value to the size of the tank pressure difference.