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Method and system for secondary air injection coordination with exhaust back pressure valve

A technology of exhaust back pressure and secondary air, applied in exhaust devices, charging systems, electrical control, etc., can solve problems such as increasing exhaust temperature, reducing engine efficiency, and increasing combustible gas.

Active Publication Date: 2016-01-27
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors herein have recognized a potential problem with such an approach
During secondary air injection, high levels of enrichment are required to increase the percentage of combustible gases in the exhaust, which reduces engine efficiency and increases particulate emissions
Additionally, a high level of spark retard is required to increase the temperature of the exhaust
As a result, combustion stability and / or engine efficiency can be degraded

Method used

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  • Method and system for secondary air injection coordination with exhaust back pressure valve
  • Method and system for secondary air injection coordination with exhaust back pressure valve
  • Method and system for secondary air injection coordination with exhaust back pressure valve

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Embodiment Construction

[0011] Provides for accelerating vehicle engines such as figure 1 Engine warm-up and catalyst activation methods and systems in engine systems for During engine cold start, exhaust backpressure and secondary air injection may be advantageously used to rapidly raise the temperature of the exhaust catalyst. The controller can be configured to execute control programs, such as figure 2 Example procedure of ) to adjust an exhaust valve positioned downstream of an exhaust catalyst to raise exhaust backpressure while delivering secondary air. The amount of enrichment and spark retard required can be reduced through the coordinated use of exhaust back pressure increase and secondary air injection. Accordingly, combustion stability, efficiency, and particulate emissions can be improved while achieving rapid catalyst heating. exist image 3 Example backpressure valves and secondary air injection volume adjustments are described at .

[0012] figure 1 A schematic diagram of vehic...

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Abstract

Methods and systems are provided for controlling and coordinating control of a post-catalyst exhaust back pressure valve and secondary air injection to expedite catalyst heating. By adjusting the exhaust back pressure valve to increase the exhaust backpressure and injecting secondary air into an exhaust passage upstream of the catalyst during cold start conditions, exhaust catalyst activation may be expedited.

Description

technical field [0001] The present invention relates to systems and methods for coordinating exhaust back pressure valve adjustments to accelerate heating of exhaust catalysts using secondary air injection, particularly during engine cold starts. Background technique [0002] Engine cold-start emissions that are released before the exhaust catalysts have been sufficiently warmed can degrade vehicle exhaust quality. Accordingly, engine control systems may use various methods to expedite reaching the activation temperature (eg, light-off temperature) at the exhaust catalyst. [0003] One example method involves generating high levels of engine-out carbon monoxide (CO), hydrogen (H 2 ) and hydrocarbons while simultaneously pumping air into the exhaust manifold upstream of the exhaust catalyst (referred to herein as secondary air injection), increasing exhaust temperature. Air that is pumped into the exhaust manifold reacts with the exhaust gas, creating an exothermic reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00F01N3/22
CPCF02D41/025F02D41/064F02D41/1448F02D2200/0802F02D2250/34F02D9/04F02M26/05F02M26/06F02M26/24F02M26/47Y02T10/12F01N3/2006F02D41/0255
Inventor T·G·利昂
Owner FORD GLOBAL TECH LLC
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