Methods for controlling a fuel metering in the multiple...

Details Methods for controlling a fuel metering in the multiple... Methods for controlling a fuel metering in the multiple...

2005-07-26

2005-07-26

Kwon, John T. (Department: 3747)

Internal-combustion engines

Combustion chamber means having fuel injection only

Using multiple injectors or injections

C123S300000, C060S285000

Reexamination Certificate

active

06920862

ABSTRACT:
The invention relates to two methods for controlling a fuel metering of a direct-injection internal combustion engine (10) in a multiple injection operating mode according to which at least two fuel injections into a cylinder (12) are carried out during a compression cycle of the cylinder (12) of the internal combustion engine (10) by means of at least one injection valve (22). The invention provides that a pressure (rail pressure, PR), under which the fuel is stored in front of the injection valve (22), is present in such a manner and/or injected fuel portions of the individual injections of a combustion cycle and/or a total fuel quantity, which is injected during a multiple injection, are varied in such a manner as to prevent a forthcoming valve opening time (Δt) of the injection valve (22) from falling below a preset valve opening time (ΔtK) during at least one injection of a combustion cycle. The inventive measures ensure, with simple means, a precise fuel metering in the multiple injection operating mode and thus enable an application of the multiple injection operating mode over wide operating ranges, particularly also in the low load operating mode and idle operating mode.

REFERENCES:
patent: 6044642 (2000-04-01), Nishimura et al.
patent: 6142121 (2000-11-01), Nishimura et al.
patent: 6434929 (2002-08-01), Nishimura et al.
patent: 6446618 (2002-09-01), Hill
patent: 2004/0118116 (2004-06-01), Beck et al.

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