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Method and system for reducing emissions

A branch, three-way catalyst technology, applied in the direction of exhaust equipment, exhaust treatment, engine starting, etc., can solve the problem of catalyst function reduction and other problems

Inactive Publication Date: 2021-10-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Temperatures above the desired exhaust gas temperature reaching the catalyst can result in reduced catalyst function

Method used

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  • Method and system for reducing emissions
  • Method and system for reducing emissions
  • Method and system for reducing emissions

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Embodiment Construction

[0023] The following description relates to systems and methods for reducing engine emissions and recovering exhaust heat while providing boost to an engine system. An example engine system including a branched exhaust assembly is at figure 1 with figure 2 shown in . exist figure 1 In this system, different heat exchangers are used to recover the exhaust heat energy for heating the cylinder walls and pistons. exist figure 2 In a system in which exhaust gas is routed through the engine cylinders, a circulating coolant is used to transfer exhaust heat to the cylinder walls and pistons. Figure 1-2 The different operating modes of the system refer to Figures 3A-3C as well as Figures 4A-4C Elaborate. The engine controller can be configured to execute control programs such as Figure 5 with Figure 8 An example program to change the position of one or more system valves, respectively, through figure 1 with figure 2 The exhaust flow of the branch exhaust assembly....

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Abstract

The present invention relates to methods and systems for reducing emissions and provides methods and systems for operating a branched exhaust assembly in a vehicle engine to increase catalyst efficiency and reduce engine emissions. In one example, a method includes flowing exhaust gas first through a three-way catalyst, then through a bottom converter, then through a heat exchanger, and then through a turbine during cold start conditions, each exhaust Components are housed on different branches on the branch exhaust assembly. After catalyst activation, the exhaust gas may flow first through the turbine, then through the bottom converter, and then through the three way catalyst, and during high engine loads, the exhaust gas entering the turbine may be cooled to reduce the heat load on the turbine .

Description

technical field [0001] The present invention generally relates to methods and systems for controlling a vehicle engine to reduce engine emissions and recover exhaust heat. Background technique [0002] The engine can be operated on a boosted air charge provided via a turbocharger, where the intake compressor is driven by the exhaust turbine. However, since the turbine acts as a heat sink, placing the turbine in the exhaust system can increase engine cold start emissions. Specifically, during engine cold starts, engine exhaust heat may be absorbed at the turbine, reducing exhaust heat received at downstream exhaust catalysts. As such, this delays catalyst light-off. Therefore, spark retard may be required in order to activate the exhaust catalyst. The fuel deficit associated with the use of spark retard can offset or even exceed the fuel economy benefits of boosted engine operation. Additionally, hydrocarbon emissions can increase during cold starts due to below threshold...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02N19/02F02N19/10F02G5/02
CPCF02G5/02F02N19/02F02N19/10F01N3/101F01N5/02F01N2240/02F01N2340/06F01N2410/03F01N2410/06F02D41/0007F02D41/062Y02T10/12Y02A50/20F01N3/2006F02D11/105F01N5/04
Inventor 张小钢
Owner FORD GLOBAL TECH LLC