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Engine control method and system

A technology of engine and cold start, applied in engine control, combustion engine, machine/engine, etc.

Active Publication Date: 2014-01-15
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As such, the method is not capable of heating the catalyst with lean injection and providing a stoichiometric exhaust air-fuel ratio

Method used

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  • Engine control method and system
  • Engine control method and system
  • Engine control method and system

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Embodiment Construction

[0027] The following description refers to methods used to reduce exhaust gas aftertreatment systems (such as Figure 1-2 Shown) systems and methods for the amount of time required to reach catalyst light-off temperature. During positive valve overlap (eg image 3 ), by providing a boosted charge across the engine cylinders and injecting some fuel with the boosted blow-through air, the heat of oxidation can be directed toward the exhaust catalyst. Further, by injecting and combusting additional fuel in the engine cylinders and combining the product of the cylinder fuel and the blow-through mixture at the exhaust manifold, an exothermic reaction can be provided at the exhaust manifold to substantially increase the catalyst temperature . The engine controller may be configured to execute control routines (such as Figure 5-6 procedure described in ) to generate a flow of fresh direct air through the cylinders by driving a boosting device such as a turbocharger. The controlle...

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Abstract

Methods and systems are provided for heating a catalyst during engine cold-start conditions. One example embodiment uses positive valve overlap to drive a boosted blow-through airflow through the cylinders of an engine. Fuel is injected with the blow-through airflow during the valve overlap, and also injected into engine cylinders outside the valve overlap. The catalyst is heated by the resulting exothermic reaction of the blow-through airflow with the combustion products and the injected fuel in the exhaust manifold.

Description

【Technical field】 [0001] The present invention generally relates to methods and systems for operating internal combustion engines. 【Background technique】 [0002] Cold start emissions from the engine, produced prior to the ignition of the exhaust system catalytic converter, can be a significant percentage of total exhaust emissions. To expedite reaching the catalyst's light-off temperature, the engine system may inject air into the exhaust manifold to burn remaining unburned fuel in the exhaust. Additionally or alternatively, the injected air may be supplemented with additional fuel to substantially increase exhaust temperature and thereby reduce light-off time. [0003] One example of such an engine system is provided in US Patent 2010 / 0263639. Therein, during an engine cold start, the engine is operated with positive valve overlap while the turbocharger compressor is at least partially driven by the motor. In this way, a blow-through air flow is created through the engi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D43/00
CPCF02D41/0007Y02T10/42F02D41/064Y02T10/44F02D41/402Y02T10/26F02D41/025F02D41/0002Y02T10/12Y02T10/40
Inventor M·D·沙恩J·D·帕科P·M·兰恩
Owner FORD GLOBAL TECH LLC