Patent ID: 6755185
Filing Date: 2004-06-29
Classification: F02D,Y10T

Abstract:
A method for controlling a tank venting valve arranged between an internal combustion engine and a fuel vapor storage unit, comprising the steps of:supplying stored fuel vapor from the fuel vapor storage unit to the internal combustion engine when the tank venting valve is open; distinguishing between an active tank venting phase and an inactive tank venting phase; presetting an opening state of the tank venting valve during the active tank venting phase by a fuel setting arrangement as a function of first operating parameters of at least one of the internal combustion engine and a tank venting system; at least one of: limiting the opening state of the tank venting valve by a purge rate limiting arrangement as a function of second operating parameters, or presetting the opening state of the tank venting valve by a purge rate setting arrangement as a function of second operating parameters; and limiting the opening state of the tank venting valve by a flow rate factor as a function of third operating parameters; and temporarily limiting when a duration of the inactive tank venting phase exceeds a minimum duration, the opening state of the tank venting valve in a subsequent active tank venting phase to a value below a value preset by one of the purge rate limiting arrangement and the purge rate setting arrangement.