Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1995-03-06
1996-07-23
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123480, F02M 5100
Patent
active
055379818
ABSTRACT:
The method and associated apparatus ascertain an air value which is used in the mixture preparation in the event of pulsations of air in the intake tube of an internal combustion engine. During each intake stroke of a cylinder of the engine, a maximum value and a minimum value of an air flow are ascertained from measured values furnished by an air flow rate meter. A differential value is formed from a magnitude of the two extreme values. And the differential value is compared with a predeterminable threshold value. For air/fuel mixture is prepared on the basis of the air value. If certain conditions apply, the processor switches over from the measured values furnished by the air flow rate meter to predetermined substitute values from a substitute performance graph. The conditions which must be met for the switchover are that (a) the differential value is greater than the threshold value, (b) the throttle valve is opened by an angle greater than a predetermined angle, and (c) the engine is not in a non-steady operating state.
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Suedholt Michael
Wier Manfred
Greenberg Laurence A.
Lerner Herbert L.
Nelli Raymond A.
Siemens Aktiengesellschaft
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