Internal-combustion engines – Combustion chamber means having fuel injection only – Using multiple injectors or injections
Reexamination Certificate
2000-03-03
2002-12-10
Solis, Erick (Department: 3747)
Internal-combustion engines
Combustion chamber means having fuel injection only
Using multiple injectors or injections
C123S300000
Reexamination Certificate
active
06491016
ABSTRACT:
The present invention relates to a method of controlling combustion of a direct-injection diesel engine by performing multiple injections by means of a common-rail injection system.
BACKGROUND OF THE INVENTION
As is known, to reduce air and noise pollution, many countries are issuing increasingly strict standards governing pollutant and noise emissions of vehicle internal combustion engines.
As regards air pollution caused by diesel engines, the main problems arise from the presence, in the exhaust gas, of nitric oxides (NOx), particulate matter, carbon monoxides (CO) and hydrocarbons (HC). Nitric oxides, in particular, are currently held responsible for a high degree of pollution by contributing in the formation and increase in the so-called “ozone gap”, and by forming, in the presence of sunlight, aggressive products which are both harmful to human beings (eye and skin ailments) and damage various types of material.
To reduce the pollutant emissions of internal combustion engines, in particular nitric oxides, various systems have been proposed, but which have failed to give the desired results.
Some of these employ a DeNox catalyst in conjunction with a postinjection of diesel fuel after the main injection, so that the unburnt diesel fuel mixes with the exhaust gas and participates in the reaction catalyzed by the DeNox catalyst to improve the efficiency of the catalyst.
Such a system, however, simply provides for more effectively reducing nitric oxides, and has no effect whatsoever in reducing other pollutant substances or noise emissions of internal combustion engines.
Alongside the problem of reducing pollution caused by pollutant and noise emissions of internal combustion engines, a strong demand also exists for internal combustion engines of increasingly greater efficiency and performance, and increasingly lower fuel consumption.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a combustion control method for reducing the pollutant emissions and combustion noise, while at the same time improving the efficiency, performance and fuel consumption of diesel engines.
According to the present invention, there is provided a method of controlling the combustion of a direct-injection diesel engine having a common-rail injection system, said method comprising the step of performing, at each engine cycle and in each cylinder of said engine, a first main fuel injection around the end-of-compression top dead center position, and being characterized by also comprising the step of performing, at each engine cycle and in each cylinder of said engine, at least one of a first auxiliary fuel injection before said first main injection, and a second auxiliary fuel injection after said first main injection; said first and said second auxiliary injection being performed close enough to said first main injection to take part, together with the first main injection, in the actual combustion of the fuel.
REFERENCES:
patent: 4621599 (1986-11-01), Igashira et al.
patent: 4704999 (1987-11-01), Hashikawa et al.
patent: 5090379 (1992-02-01), Ito
patent: 5170751 (1992-12-01), Tosa et al.
patent: 5231962 (1993-08-01), Osuka et al.
patent: 5740775 (1998-04-01), Suzuki et al.
patent: 5960627 (1999-10-01), Krampe et al.
patent: 0 534 491 (1993-03-01), None
patent: 0 621 400 (1994-10-01), None
patent: 0 767 303 (1997-04-01), None
patent: 0 793 776 (1997-09-01), None
patent: 0 889 220 (1999-01-01), None
patent: WO 97/11269 (1997-03-01), None
Chmela et al., “Emissionsverbssserung an Dieselmotoren mit Direkteinspritzung Mittels Einspritzverlaufsformung”, MTZ Motortechnische Zeitschrift, vol. 60, No. 9, Sep. 1999, pp. 552-558 (XP 000870853).
C. R. F. Societa Consortile per Azioni
Solis Erick
LandOfFree
Method of controlling combustion of a direct-injection... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of controlling combustion of a direct-injection..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling combustion of a direct-injection... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2995199