Patent ID: 7140352
Filing Date: 2006-11-28
Classification: F02D,F02N,F02P,Y02T

Abstract:
1. A method for controlling the metering of fuel in a fuel system of an internal combustion engine having a crankshaft to which rotation is imparted during operation of the engine, the fuel system including: an intake channel wherein an underpressure develops; nozzle means opening into the intake channel; a fuel storage space; a fuel line between the fuel storage space and the nozzle means from which fuel can flow into said intake channel in response to an underpressure therein; an electromagnetic valve having an excitation coil and being mounted in the fuel line and being switchable between a first position wherein said valve is deenergized and open and a second position wherein said valve is energized and closed; an energy store for providing the energy needed to switch the electromagnetic valve into the second position thereof; a generator for supplying the energy store with energy when the crankshaft rotates; said electromagnetic valve being switchable into said second position only when a supply voltage (U a control unit operatively connected to said electromagnetic valve; and, an engine control operatively connected to the control unit; the method comprising the steps of: causing said engine control to switch said electromagnetic valve into said second position via said control unit in dependence upon operating parameters of said engine by applying said supply voltage (U causing said control unit to switch said excitation coil onto said supply voltage (U whereas, during the remainder of said blocking time interval during which no underpressure is present at said nozzle means, causing said control unit to switch off said supply voltage (U