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Method for operating a direct-injection spark-assisted compression-ignition engine

An engine, combustion technology, applied in combustion engines, internal combustion piston engines, engine control and other directions, can solve the problem of unpleasant combustion noise consumers

Inactive Publication Date: 2011-08-03
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive combustion noise annoys consumers

Method used

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  • Method for operating a direct-injection spark-assisted compression-ignition engine
  • Method for operating a direct-injection spark-assisted compression-ignition engine
  • Method for operating a direct-injection spark-assisted compression-ignition engine

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Embodiment Construction

[0038] Referring now to the drawings, in which certain exemplary embodiments are shown for purposes of illustration only and not for limitation of said embodiments, figure 1A single cylinder and accompanying control module 5 of a direct injection spark assisted compression ignition engine 10 constructed in accordance with an embodiment of the present invention is schematically illustrated. Those skilled in the art will recognize that the present disclosure is applicable to multi-cylinder compression ignition engines. Engine 10 may operate in a variety of combustion modes, including a premixed charge compression ignition (PCCI) combustion mode, and a compression ignition (ie, compression ignition) combustion mode. Engine 10 operates primarily at a lean air / fuel ratio and is configured to operate at a geometric compression ratio greater than 10:1. The present disclosure is applicable to various internal combustion engine systems and combustion cycles. For example, in one embod...

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Abstract

The present invention relates to a method for operating a direct-injection spark-assistend compression-ignition engine. A compression-ignition internal combustion engine includes a plurality of combustion chambers operating in a four-stroke combustion cycle and is configured to operate at a geometric compression ratio greater than 10:1. A method for operating a the engine includes forming a fuel / air charge by injecting fuel into each combustion chamber during a compression stroke, wherein the injection is completed prior to any combustion within the combustion chamber. The method further includes operating the engine to manage temperature of the fuel / air charge in the combustion chamber below an auto-ignition point of the fuel / air charge, and providing a spark discharge in the combustion chamber subsequent to injecting the fuel and in advance of the fuel / air charge achieving an auto-ignition temperature.

Description

technical field [0001] The present disclosure relates to direct injection compression ignition internal combustion engines. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Internal combustion engines can include spark-ignition engines and compression-ignition engines. Known spark ignition engines operate by introducing a mixture of air and fuel into the combustion chamber of the engine. The piston compresses this mixture, and at a predetermined crankshaft angle, the spark plug ignites the fuel and air mixture to create a flame front that propagates through the combustion chamber. The rapid increase in heat from the burning fuel triggers an increase in pressure pushing the piston down. The use of spark plugs allows for precisely timed combustion events. Keep the engine's compression ratio relatively low to avoid spark knock. Spark knock occurs w...

Claims

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Application Information

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IPC IPC(8): F02D15/00F02D37/02
CPCF02D41/3041F02B17/005F02D35/025Y02T10/42F02D35/02F02D13/0265F02D35/023F02D2200/0416F02D35/021Y02T10/128F02D41/1441Y02T10/12
Inventor R P 杜里特
Owner GM GLOBAL TECH OPERATIONS LLC