Strategy for fueling a diesel engine by selective use of fueling maps to provide HCCI, HCCI+CD, and CD combustion modes

a technology of hcci and cd, which is applied in the direction of combustion engines, electric control, machines/engines, etc., can solve the problems of difficult control of combustion rate, achieve the effect of enhancing the use of hcci combustion, reducing the generation of undesired constituents, and improving thermal efficiency
US20050284441A1Inactive Publication Date: 2005-12-29INT ENGINE INTPROP CO LLC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
INT ENGINE INTPROP CO LLC
Publication Date
2005-12-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

A compression ignition engine (20) has a control system (26) for processing data, one or more combustion chambers (22), and fuel injectors (24) for injecting fuel into the chambers. The control system controls fueling using a result of the processing of certain data, such as engine speed and engine load, to select one of three fueling modes (HCCI, HCCI+CD, CD) for operating the engine. When the result of the processing selects the HCCI mode, the engine is fueled to cause homogeneous-charge compression-ignition (HCCI) combustion in all combustion chambers. When the result of the processing selects the HCCI+CD mode, the engine is fueled to cause HCCI combustion in some chambers and CD (conventional diesel) combustion in the remaining chambers. When the result of the processing selects the CD mode, the engine is fueled to cause CD combustion in all chambers.
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Description

FIELD OF THE INVENTION

[0001] This invention relates generally to internal combustion engines. More specifically it relates to a control strategy for selectively utilizing homogeneous-charge compression-ignition (HCCI) in a way that takes advantage of HCCI's attributes in different ways during different modes of engine operation. More specifically the invention relates to a strategy for fueling an engine to cause HCCI combustion in all cylinders during a first mode, to cause HCCI combustion in less than all cylinders and CD (conventional diesel) combustion in the remaining cylinders during a second mode, and CD combustion in all cylinders during a third mode. BACKGROUND OF THE INVENTION

[0002] HCCI is a known process for fueling a diesel engine in a manner that creates a substantially homogeneous air-fuel charge inside an engine cylinder during a compression upstroke of an engine cycle. After a desired quantity of fuel for the charge has been injected into the cylinder to create a s...

Claims

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