Internal-combustion engines – Charge forming device – Supercharger
Reexamination Certificate
2000-04-20
2001-09-04
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Charge forming device
Supercharger
C060S599000
Reexamination Certificate
active
06283100
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is generally related to control systems and techniques for controlling compression ignition engines, and, more particularly, the present invention is related to a control system and method for reducing exhaust emissions and improving engine efficiency, specially during partial load conditions of the engine.
In a typical turbocharged or supercharged diesel engine, the engine inlet air may be compressed in a turbocharger or supercharger compressor and then passed through an intercooler to a respective intake manifold prior to being drawn into a respective cylinder of the engine. As will be appreciated by those skilled in the art, a locomotive engine may be operable at a plurality of different throttle positions or notches. In general, a notch specifies a commanded engine speed and/or power and results in a given load and/or speed condition for the engine. For example, there may be eight power positions or notches (N), plus idle. Notch N
1
may correspond to the minimum desired engine speed and power, while notch N
8
may correspond to maximum speed and full power.
When the engine is operating at or near full speed and load, the temperature of the air discharged by the compressor may be high relative to a coolant fluid circulated through the intercooler, and thus such air would be desirably cooled in the intercooler. Conversely, while the engine operates during partial load conditions, e.g., from notch N
1
to a predetermined intermediate notch position or at the idle notch position, the temperature of the compressor-discharge air may be low compared to the intercooler coolant. Under presently known engine control techniques used during partial engine load conditions, the compressed air may be conditioned in the intercooler to about the same temperature level of the engine cylinders coolant and lubrication oil regardless of whether a resulting intake manifold air temperature (IMAT) corresponds to a reduced level of exhaust emissions or an optimal combustion efficiency in the cylinders of the engine, that is, such techniques do not allow for adjusting IMAT to optimize in-cylinder combustion and heat release and consequently exhaust emissions and engine efficiency may be somewhat less than optimal. Thus, such presently known control techniques do not take advantage of the fact that engine output performance and exhaust emissions may be positively affected by appropriate control of IMAT at partial or relatively low load conditions. For example, as the engine is operated in a respective partial load condition, selectably lowering manifold air temperature could reduce engine exhaust emissions including not only nitrogen oxides (NO
x
), but also carbon monoxide (CO), smoke and other pollutants.
In view of the foregoing considerations, it is desirable to reduce exhaust emissions and improve the output performance of such engines particularly when operating at partial load conditions.
SUMMARY OF THE INVENTION
Generally speaking, the present invention fulfills the foregoing needs by providing a method for controlling a compression-ignition engine in large equipment, such as locomotives, marine vessels, off-road vehicles, and power generation equipment, operable in a selected one of a plurality of engine throttle notches. Each throttle notch is indicative of a respective load and/or speed condition of the engine. The engine has an intercooling system using a predetermined cooling fluid and the engine is configured to receive a predetermined combustion-supporting fluid (e.g., air) into a plurality of cylinders through a respective intake manifold. The method allows for sensing the selected throttle notch, and for selectively actuating the intercooling system to adjust a predetermined operational parameter (e.g., intake manifold air temperature) based on the sensed throttle notch.
The present invention may further fulfill the foregoing needs by providing in one exemplary embodiment a control system for controlling a compression-ignition engine operable in a selected one of a plurality of engine throttle notches. Each throttle notch may be indicative of a respective load and/or speed condition of the engine. The engine has an intercooling system using a predetermined cooling fluid. The engine is configured to receive a predetermined combustion-supporting fluid into a plurality of cylinders through a respective intake manifold. The system comprises a sensor coupled to sense the selected throttle notch. The system further comprises one or more sensors respectively coupled to sense a predetermined parameter indicative of a respective ambient condition, and a control module configured to selectively actuate the intercooling system to adjust one or more predetermined operational parameters based on the sensed throttle notch and/or the value of the respective parameters indicative of the ambient condition.
REFERENCES:
patent: 3397684 (1968-08-01), Scherenberg
patent: 3621907 (1971-11-01), Ephraim, Jr. et al.
patent: 3648715 (1972-03-01), Boothe
patent: 3771293 (1973-11-01), Vest
patent: 3863612 (1975-02-01), Wiener
patent: 4061187 (1977-12-01), Rajasekaran et al.
patent: 4133185 (1979-01-01), Dickey
patent: 4231384 (1980-11-01), Christensen
patent: 4413595 (1983-11-01), Potts, Jr.
patent: 4563983 (1986-01-01), Hayashi et al.
patent: 4592323 (1986-06-01), Vest
patent: 4656973 (1987-04-01), Endres
patent: 4711204 (1987-12-01), Rusconi
patent: 4894780 (1990-01-01), Simonyi et al.
patent: 4907645 (1990-03-01), Dumas et al.
patent: 4955431 (1990-09-01), Saur et al.
patent: 4961404 (1990-10-01), Itakura et al.
patent: 5036803 (1991-08-01), Nolting et al.
patent: 5119795 (1992-06-01), Goto et al.
patent: 5201285 (1993-04-01), McTaggart
patent: 5353757 (1994-10-01), Susa et al.
patent: 5392741 (1995-02-01), Uzkan
patent: 5415147 (1995-05-01), Nagle et al.
patent: 5566745 (1996-10-01), Hill et al.
patent: 5598705 (1997-02-01), Uzkan
patent: 5669311 (1997-09-01), Hill et al.
patent: 5791316 (1998-08-01), Houtz et al.
patent: 5828967 (1998-10-01), Ueda
patent: 6006731 (1999-12-01), Uzkan
patent: 0 389 592 B1 (1993-03-01), None
patent: 0 499 071 B1 (1994-08-01), None
patent: 0 721 060 A2 (1996-07-01), None
patent: 0 857 958 A1 (1998-08-01), None
patent: 0 875 631 A1 (1998-11-01), None
patent: 08186926 A (1996-07-01), None
patent: 09195777 A (1997-07-01), None
R. A. Nutt and R. F. Poehlman; Cooling System Requuirements for Advanced Diesel Engines; SAE The Engineering Resource For Advancing Mobility West Coast International Meeting Aug. 16-19, 1992.
Jean-Pierre Moranne & Jerome J. Lukas; Air-to-Air Turbocharged Air Cooling Versus Air-to-Water Turbocharged Air Cooling; SAE The Engineering Resource For Advanced Mobility; International Congress & Exposition Feb. 27-Mar. 2, 1984.
Geoffrey Bond & Robert M. Brooks; Selection of the Optimized Aftercooling System for Cummins Premium Diesel Engines; SAE The Engineering Resource For Advanced Mobility; West Coast International Meeting & Exposition Aug. 6-9, 1984.
Chen Gong
Dillen Eric
Gallagher Michael Shawn
Argenbright Tony M.
Beusse Brownlee Bowdoin & Wolter PA
General Electric Company
Mora, Esq. Enrique J.
Rowold, Esq. Carl A.
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