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

Inactive Publication Date: 2005-12-29
INT ENGINE INTPROP CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The present invention relates to an engine, system, and method for enhancing the use of HCCI combustion in a diesel engine toward objectives that include further reducing the generation of undesired constituents in engine exhaust, especially soot and NOx, and further improving thermal efficiency. The invention is embodied in the fuel injection control strategy, a strategy that is programmed in an associated processing system.

Problems solved by technology

At higher engine speeds and larger engine loads, the rate of combustion is difficult to control.
Consequently, known engine control strategies may utilize HCCI only at relatively lower speeds and smaller engine loads.

Method used

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

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Embodiment Construction

[0027]FIG. 1 is a graph whose vertical axis represents engine load and whose horizontal axis represents engine speed. At the origin of the graph, engine load is zero, and engine speed is zero. Respective solid lines 10, 12, and 14 demarcate three zones labeled HCCI, HCCI+CD, and CD.

[0028] Zone HCCI covers an area that encompasses various combinations of relatively smaller engine loads and relatively lower engine speeds. Zone HCCI+CD covers an area that encompasses various combinations of relatively larger engine loads and relatively higher engine speeds than those of zone HCCI. Zone CD covers an area that encompasses various combinations of still relatively larger engine loads and still relatively higher engine speeds than those of zone HCCI+CD.

[0029] When a compression ignition engine is operating at a speed and load that falls within Zone HCCI, fuel is injected into the engine cylinders in a manner that creates HCCI combustion. When the engine is operating at a speed and load th...

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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.

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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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02B5/00F02B17/00F02D13/06F02D21/08F02D41/00F02D41/30F02D41/34
CPCF02D13/06F02D41/0082F02D41/2412F02D41/3076F02D41/40Y02T10/128Y02T10/18F02D41/3035Y02T10/12F02B1/14F02B3/00F02B17/00
Inventor LIU, ZHENGBAIWEI, PUNING
Owner INT ENGINE INTPROP CO LLC
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