Method and system for engine control

An engine and engine starting technology, applied in engine control, combustion engine, machine/engine, etc., can solve problems such as degraded fuel economy and cold start exhaust emissions

Active Publication Date: 2014-10-15
FORD GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In summary, fuel economy and cold start exhaust emissions will be degraded if the system is not optimized for the current operating conditions and fuel type

Method used

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  • Method and system for engine control
  • Method and system for engine control
  • Method and system for engine control

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Embodiment Construction

[0013] The following description relates to adjusting the engine based on the alcohol content of the injected fuel during engine starting and cranking (such as figure 1 System and method for fuel injection to reduce engine soot load. The engine controller can execute control programs such as figure 2 procedure in ) to adjust the fuel injection model (including the amount of fuel port injected into the cylinder and direct injection into the cylinder through multiple injections) during engine start and crank start based on fuel composition (such as fuel based alcohol content) amount of fuel). The model may be further tuned based on each of exhaust catalyst temperature and cylinder event number to expedite catalyst activation while reducing exhaust PM emissions and without degrading combustion stability. By adjusting the fuel injection model from a model with a relatively higher amount of port injection during engine cranking and cranking, and transitioning to a fuel injection...

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Abstract

Methods and systems are provided for controlling exhaust emissions by adjusting an injection profile for fuel injected into an engine cylinder from a plurality of fuel injectors during engine start and crank. By splitting injection of fuel during start so that a portion of fuel is port injected and a remaining portion is direct injected as one or multiple injections, the soot load of the engine can be reduced and fuel economy can be improved. The injections are adjusted based on the alcohol content of the injected fuel to take advantage of the charge cooling properties of the fuel.

Description

【Technical field】 [0001] The present invention relates to methods and systems for controlling fuel injection in an engine system coupled to a flex fuel vehicle. 【Background technique】 [0002] Engines may be equipped with direct fuel injectors that inject fuel directly into the combustion cylinder (direct injection) and / or with port fuel injectors that inject fuel into the intake port of the cylinder (port fuel injection). In a flex-fuel vehicle, a flex-multi-fuel engine may be operated by delivering varying proportions of variable fuel of varying composition fuel to different injectors. For example, direct injection of ethanol fuel can take advantage of the increased charge cooling effect of the alcohol fuel's higher heat of vaporization and higher octane rating. This helps to address knock limitation especially under boost conditions. [0003] However, direct injection engines also produce more particulate matter emissions (or soot) due to diffuse flame spread, where the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30
CPCF02D2200/0612F02D41/064F02D41/0025F02D43/04F02D41/402F02D41/3094F02D41/065Y02T10/40
Inventor G·苏尔尼拉S·施罗德P·C·莫伊莱宁E·克兰吉尔
Owner FORD GLOBAL TECH LLC
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