Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Reexamination Certificate
2000-05-24
2001-10-02
Denion, Thomas (Department: 3748)
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
C060S600000, C060S601000, C123S564000
Reexamination Certificate
active
06295816
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to the field of rail locomotives and more particularly to a method and apparatus for protecting a turbo-charged diesel locomotive engine from excessively high pressure in the combustion chamber.
It is known that excessively high pressure in the combustion chamber of an internal combustion engine can cause damage to the engine pistons, cylinder heads, and other components. The peak combustion chamber pressure is a function of the combustion process and the conditions of the incoming combustion air. The operation of a turbo-charger increases the peak combustion chamber pressure by increasing the temperature and pressure of the incoming air.
There are many known prior art arrangements for limiting the combustion chamber pressure. U.S. Pat. No. 4,655,040 issued on Apr. 7, 1987, to Parker discloses a relief valve (waste-gate valve) to bypass a portion of the engine exhaust gases around the turbine portion of a turbo-charger in order to limit the amount of pressure boost provided by the compressor portion of the turbo-charger. Waste gate valves are particularly expensive because they must be designed to operate in the harsh environment of the exhaust system.
U.S. Pat. No. 4,557,111 issued on Dec. 10, 1985, to Haussmann et al. discloses a control system for engaging and disengaging the operation of a turbo-charger. The apparatus of Haussmann is particularly useful for applications where the throttle setting of the engine is varied often. It is undesirable to utilize any system which cycles the turbo-charger on and off for applications where the engine operates for extended periods at a steady speed, such as in locomotive applications.
U.S. Pat. No. 4,434,761 issued on Mar. 6, 1984, to Ludwig teaches a fuel flow regulator which reduces the rate of flow of fuel to a diesel engine when the manifold intake air pressure is greater than a pre-determined value in order to protect the engine from an over-boost condition. It is undesirable to utilized a control system that decreases the fuel flow to a locomotive engine since the overall power production of the engine is a prime operating consideration.
U.S. Pat. No. 5,782,092 issued on Jul. 21, 1998, to Schultalbers et al. describes a control arrangement for a turbo-charger having a variable turbine geometry for controlling the output pressure of the compressor section of the turbo-charger. Variable turbine geometry turbo-chargers are expensive and are primarily beneficial in applications where the engine speed must be varied often, and where acceleration of the vehicle is a primary consideration. As such, the apparatus of Schultalbers is not particularly well suited for application to a turbo-charged diesel locomotive engine.
BRIEF SUMMARY OF THE INVENTION
Thus there is a particular need for a method and apparatus for protecting a turbo-charged diesel locomotive engine from excessively high combustion chamber pressure. Such a system should preferably be simple and inexpensive, and should not reduce the power output of the engine.
Accordingly, a power unit for a locomotive is described herein as including: a diesel engine having an intake manifold for receiving compressed air and an exhaust manifold; a turbo-charger having a turbine portion connected to the exhaust manifold and a compressor section having an outlet connected to the intake manifold, the turbo-charger operable to provide compressed air to the intake manifold at an intake manifold air pressure; and a relief valve in fluid communication between the turbo-charger outlet and the intake manifold and operable to release a selected amount of the compressed air to atmosphere in response to the intake manifold air pressure.
A method of protecting a turbo-charged diesel locomotive engine from excessively high combustion chamber pressure is also described herein, the method comprising the steps of: determining an allowable combustion chamber pressure for the turbo-charged diesel engine; determining a first pressure rise in the combustion chamber over the first pressure rise as a function of the manifold air temperature; determining a second pressure rise in the combustion chamber over intake manifold air pressure as a function of a timing of fuel injection into the combustion chamber; determining a program intake manifold air pressure as a function of the allowable combustion chamber pressure, the first pressure rise, and the second pressure rise; comparing the program intake manifold air pressure to actual intake manifold air pressure to determine a control pressure differential; and controlling the intake manifold air pressure as a function of the control pressure differential.
REFERENCES:
patent: 4122679 (1978-10-01), Charron
patent: 4169355 (1979-10-01), Walsham et al.
patent: 4183216 (1980-01-01), Tanaka et al.
patent: 4372119 (1983-02-01), Gillbrand et al.
patent: 4424675 (1984-01-01), Ojima
patent: 4428199 (1984-01-01), Moore et al.
patent: 4434761 (1984-03-01), Ludwig
patent: 4557111 (1985-12-01), Haussmann et al.
patent: 4630445 (1986-12-01), Parker
patent: 4655040 (1987-04-01), Parker
patent: 4763474 (1988-08-01), Franklin
patent: 4779423 (1988-10-01), Szczupak
patent: 5261236 (1993-11-01), Ironside et al.
patent: 5477840 (1995-12-01), Neumann
patent: 5526645 (1996-06-01), Kaiser
patent: 5579643 (1996-12-01), McEwen et al.
patent: 5724813 (1998-03-01), Fenelon et al.
patent: 5755101 (1998-05-01), Free et al.
patent: 5778674 (1998-07-01), Kimura
patent: 5782092 (1998-07-01), Schultalbers et al.
patent: 5819538 (1998-10-01), Lawson, Jr.
patent: 5850737 (1998-12-01), Aschner et al.
patent: 5850738 (1998-12-01), Hayashi
patent: 6000222 (1999-12-01), Regnier
Alvarez Juan Carlos
Gallagher Shawn Michael
Glenn Doug
Khalil Ihab
Beusse Brownlee Bowdoin & Wolter PA
Denion Thomas
General Electric Company
Maire, Esq. David G.
Rowold, Esq. Carl A.
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