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Internal combustion engine exhaust gas recirculation control

A technology of exhaust gas recirculation and controller, applied in the direction of exhaust gas recirculation, electrical control, engine control, etc., can solve the problems of different EGR, unstable combustion process, etc.

Active Publication Date: 2009-07-08
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, any changes in boost pressure, exhaust backpressure, intake manifold temperature, or other factors that affect engine volumetric efficiency (eg, atmospheric air temperature and humidity) will have an adverse effect on the EGR control system, thus effectively achieving The EGR will differ from the calibrated value, causing undesired NOx emission levels or combustion process instability

Method used

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  • Internal combustion engine exhaust gas recirculation control
  • Internal combustion engine exhaust gas recirculation control
  • Internal combustion engine exhaust gas recirculation control

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Embodiment Construction

[0012] now refer to Figure 1-3 , a schematic diagram depicting an internal combustion engine and a control system constructed according to various embodiments of the invention corresponding to the respective figures. An exemplary engine and control system includes a conventional four-stroke internal combustion engine 12 and an electronic engine control module (ECM) (not separately shown). Exemplary engines include known compression-ignition engines having operating conditions that are primarily lean of stoichiometry. Alternatively, the engine may include an engine utilizing any of a number of engine control strategies that operate lean of stoichiometry, eg, homogeneous charge compression ignition engines, and lean burn spark ignition engines. The exemplary engine 12 includes a plurality of reciprocating pistons attached to a crankshaft, which is operably attached to a vehicle driveline to transmit tractive torque to the driveline.

[0013] The control system preferably incl...

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PUM

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Abstract

An internal combustion engine is configured with combustion chamber pressure sensing and exhaust gas recirculation apparatus. Exhaust gas recirculation control includes closed-loop controlling exhaust gas recirculation apparatus in accordance with a predetermined control target. Adjustments to the control target are made based on combustion chamber pressure information.

Description

technical field [0001] The present invention relates to internal combustion engines. More specifically, the present invention relates to exhaust gas recirculation (EGR) control and individual cylinder phasing. Background technique [0002] Modern diesel and gasoline internal combustion (IC) engines use large amounts of EGR to reduce nitrogen oxides (commonly known as NOx) emissions. In some diesel engine applications, the level of EGR achieved is more important, as failure to achieve the required level of EGR can lead to instability problems, especially in unconventional or special combustion modes, such as premixed charge compression ignition (PCCI). Certain other combustion modes, such as controlled auto-ignition, are also more sensitive to EGR concentration. [0003] A specific level of EGR can be achieved by using a closed loop control system for EGR valve position, where the set point of the closed loop system is calibrated to the fresh air flow observed by a mass air...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M7/00F02M25/07
CPCF02D41/0052F02M25/0754F02D41/187F02D41/0085F02D2041/1419F02D35/02F02D2041/001F02D35/028F02D41/1401F02D35/023Y02T10/47F02D41/0072F02M26/47Y02T10/40
Inventor I·哈斯卡拉A·甘戈帕迪亚伊P·A·贝蒂斯顿F·A·马特库纳斯P·G·什姆科维奇
Owner GM GLOBAL TECH OPERATIONS LLC