Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine
Reexamination Certificate
2000-03-16
2001-08-21
Nguyen, Hoang (Department: 3748)
Power plants
Fluid motor means driven by waste heat or by exhaust energy...
With supercharging means for engine
C060S606000, C060S611000
Reexamination Certificate
active
06276139
ABSTRACT:
FIELD OF THE INVENTION
The field of the present invention is that of automotive engines, particularly low emission turbo-charged diesel engines and methods of operation thereof. The diesel engine arrangement of the present invention has particular application in small diesel engines used to power passenger cars, sport utility vehicles and pickup trucks.
BACKGROUND OF THE INVENTION
Emission-after-treatment devices, such as particulate filters, oxidation catalysts and NOx catalysts, require certain conditions in the engine exhaust in order to perform optimally. In particular, NOx catalysts have a relatively narrow temperature window within which the conversion efficiency is sufficiently high. Diesel particulate filters require sufficient oxygen in order to maintain regeneration at high engine loads. Prior to the present invention, the required exhaust gas conditions could not always be achieved during normal operation of the engine. In particular, at high engine loads, it was difficult if not impossible to provide sufficiently high levels of oxygen required by the particulate filter. Also the exhaust gas temperature could only be influenced to a certain degree by the combustion system.
BRIEF SUMMARY OF THE INVENTION
The present invention entails an engine arrangement with a bypass from a turbocharger compressor outlet directly into the exhaust system downstream of a turbocharger turbine. An electrically or pneumatically actuated control valve controls the flow of air through the bypass. The bypass is preferably used in conjunction with an actively controlled wastegate or a variable geometry turbocharger. The bypass allows for the introduction of the relatively cool air into the exhaust that leads to a reduction of the exhaust gas temperature and increased oxygen concentration. In combination with an actively controlled wastegate or a variable geometry turbocharger, the present invention allows for simultaneous control of oxygen content, exhaust temperature and boost pressure at relatively low cost. For engines equipped with a NOx catalyst, the invention enables control of the exhaust gas temperature so as to stay within the narrow temperature window with high catalyst conversion efficiency. For engines equipped with a particulate filter, the invention enables control of the exhaust gas oxygen content so as to supply sufficient oxygen to the filter during a regeneration event.
These and other features and advantages of this invention will become apparent to one skilled in the art from the following detailed description and the accompanying drawings illustrating features of this invention by way of example.
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Carberry Brendan Patrick
Moraal Paul Eduard
Drouillard Jerome P.
Ford Global Technologies Inc.
Nguyen Hoang
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