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Cold start strategy and system for gasoline direct injection compression ignition engine

a technology of compression ignition and cold start, which is applied in the direction of engine starters, combustion air/fuel air treatment, electric control, etc., to achieve the effect of increasing the temperature and/or pressure of increasing the temperature and/or pressure of the intake air, and raising the temperature and/or pressure of the air in the cylinder

Inactive Publication Date: 2015-04-30
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a method and system for starting a GDCI engine by cranking it, conditioning the intake air, controlling valve timing to increase temperature and pressure in the cylinder, and injecting fuel into it. This allows for ignition and combustion of the air-fuel mixture within the cylinder. The technical effect is improved engine starting with reduced emissions and improved efficiency.

Problems solved by technology

This is especially a concern when cold starting an engine.

Method used

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  • Cold start strategy and system for gasoline direct injection compression ignition engine
  • Cold start strategy and system for gasoline direct injection compression ignition engine
  • Cold start strategy and system for gasoline direct injection compression ignition engine

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Embodiment Construction

[0010]As used herein, the term “cold start” refers to starting the engine when the temperature of the components of the engine and the fluids within the engine are below their respective temperatures when the engine has been operating long enough to reach thermal equilibrium at temperatures above ambient temperature. A “cold start event” refers to the act of performing a cold start of the engine, including the time when an engine start is predicted but before the actual initiation of engine cranking, the time when the engine is cranked, and the transition to a running state where the cranking means is disengaged and the engine rotational speed remains above a minimum threshold.

[0011]FIG. 1 illustrates a non-limiting embodiment of an engine control system 10 suitable for controlling the cold start of a GDCI internal combustion engine 12. The engine 12 is illustrated as having a single cylinder bore 64 containing a piston 66, wherein the region above the piston 66 defines a combustion...

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PUM

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Abstract

A method for starting a compression ignition engine having at least one cylinder with a reciprocating piston located therein, an intake valve configured to control the intake of air to an intake port of the cylinder and an exhaust valve configured to control the expulsion of gas from an exhaust port of the cylinder. The method includes the steps of: cranking the engine, conditioning intake air at the intake port of the cylinder to raise the temperature of air in the cylinder, controlling a valve timing the intake valve and / or the exhaust valve to allow the piston to compress the air within the cylinder, thereby increasing the temperature of the air within the cylinder, and injecting fuel into the cylinder when the air within the cylinder has been heated to a temperature sufficient to support compression ignition of a gasoline and air mixture within the cylinder.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0001]This invention was made with government support under Contract No. DE-EE0003258 awarded by the Department of Energy. The government has certain rights in the invention.BACKGROUND OF THE INVENTION[0002]Gasoline Direct-injection Compression-Ignition (GDCI) is an engine operating mode that shows promise in improving engine emissions performance and efficiency. GDCI provides low-temperature combustion for high efficiency, low NOx, and low particulate emissions over the complete engine operating range. Low-temperature combustion of gasoline may be achieved using multiple late injection (MLI), intake boost, and moderate EGR. GDCI engine operation is described in detail in U.S. Patent Application Publication 2013 / 0213349A1, the entire contents of which are hereby incorporated herein by reference.[0003]The autoignition properties of gasoline fuels require higher in-cylinder pressure and temperature compared to diesel fuel ...

Claims

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Application Information

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IPC IPC(8): F02N19/04F02N19/00
CPCF02N19/004F02N19/04F02D41/064F02D41/18F02D41/3035F02B3/06F02B29/0418F02B37/04F02B39/04F02M31/13F02D15/00F02D23/00F02D41/0007F02D2200/101F02D2700/035F02B39/12F02B29/0412F02B29/0443F02D9/04F02D13/0219F02N2200/023F02M26/08F02M26/28F01L13/08Y02T10/12Y02T10/40
Inventor SELLNAU, MARK C.ROTH, GREGORY THOMAS
Owner DELPHI TECH IP LTD
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