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Methodology for extending the high load limit of hcci operation by adjusting injection timing and spark timing

A technology of spark timing and fuel injection timing, which is applied in spark ignition controller, engine ignition, forward/reverse ignition, etc., can solve problems such as the possibility of increased combustion, bad pressure fluctuations or ringing

Active Publication Date: 2010-12-15
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increased energy, such as that possessed by the higher temperature of the combusting air-fuel charge, increases the likelihood that the air-fuel charge will burn before the intended combustion point, resulting in undesirable pressure surges or ringing from the combustion chamber

Method used

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  • Methodology for extending the high load limit of hcci operation by adjusting injection timing and spark timing
  • Methodology for extending the high load limit of hcci operation by adjusting injection timing and spark timing
  • Methodology for extending the high load limit of hcci operation by adjusting injection timing and spark timing

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Embodiment Construction

[0037] Referring now to the drawings, which are shown for purposes of illustrating certain exemplary embodiments only and not for purposes of limiting the embodiments; figure 1 A schematic diagram depicting an internal combustion engine 10 and an accompanying control module 5 constructed in accordance with an embodiment of the invention.

[0038] The exemplary engine 10 comprises a multi-cylinder direct injection four-stroke internal combustion engine having reciprocating pistons 14 slidably movable in cylinders defining a variable volume combustion chamber 16 . Each piston is connected to a rotating crankshaft 12 (CS) by which the linear reciprocating motion of the pistons is converted into rotational motion. There is an intake system that provides intake air to an intake manifold that directs and distributes the air into intake slides 29 to the individual combustion chambers 16 . The air intake system consists of airflow ducts, and devices for monitoring and controlling the...

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Abstract

A method for operating an internal combustion engine including extended operation in a homogeneous charge compression ignition mode at high loads includes operating the engine in the homogeneous charge compression ignition mode including spark-assisted ignition, monitoring an engine load, monitoring an engine speed, determining the engine to be in a high ringing range based upon the engine load and the engine speed, and when the engine load is in the high ringing range, operating the engine in a reduced ringing mode. The reduced ringing mode includes modulating a fuel injection timing according to a calibrated maximum combustion chamber cooling fuel injection timing, determining a preferred combustion phasing value, and modulating a spark timing based upon the modulated fuel injection timing and the preferred combustion phasing value.

Description

technical field [0001] This invention relates to internal combustion engines, and more particularly to controlling their operation. Background technique [0002] The statements in this paragraph merely provide background information related to the present disclosure and may not constitute prior art. [0003] Internal combustion engines, especially automotive internal combustion engines, generally fall into one of two categories: spark ignition engines and compression ignition engines. Conventional spark ignition engines, such as gasoline engines, generally function by introducing a fuel / air mixture into a combustion cylinder; the mixture is then compressed during the compression stroke and ignited by a spark plug. Conventional compression ignition engines, such as diesel engines, typically function by introducing or injecting pressurized fuel into the combustion cylinder near top dead center (TDC) of the compression stroke; the fuel ignites upon injection. Combustion in bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00
CPCF02D41/3041F02D41/401Y02T10/44F02P5/1502F02D37/02Y02T10/47F02D41/008Y02T10/128Y02T10/46F02D41/0057F02D35/028Y02T10/12Y02T10/40
Inventor H·允N·维尔穆斯P·M·纳特J·-M·康G·格雷威尔特
Owner GM GLOBAL TECH OPERATIONS LLC
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