Engine controlled by combustion reaction path and regulating method thereof

Patent metadata

Field	Value
Publication number	US-10837411-B2
Application number	US-201615268586-A
Country	US
Kind code	B2
Filing date	Sep 18, 2016
Priority date	Aug 19, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

The present invention discloses a novel engine controlled by combustion reaction path, which cylinders comprise working cylinders and reforming cylinders. According to the operational condition of engine, the engine is used for compressing, heating and reforming the fuel injected from the reforming cylinder injector; by controlling the reaction boundary conditions between fuel and air, the reforming cylinder can exhaust partial intermediate products or oxidation products of the different oxidation stages; the products are then mixes with the inlet air in the pre-mixing chamber and then is introduced into the working cylinder. Under operating in different working conditions, the engine can discharge the mixed gas with different activities under different oxidation stages by regulating the corresponding boundary conditions of the reforming reaction of the reforming cylinder, and can achieve concentration stratification and activity stratification of the mixed gas in the working cylinder by using the fuel injected from the working cylinder injectors, and can effectively achieve high effectiveness and broaden the scope of clean combustion by changing the combustion reaction path. The present invention just adopts simple oxidation reaction post-treatment device, and then the emission of the engine can meet the requirement of EuroVI emission regulation.

First claim

What is claimed is:

1. A method of exhaust gas recirculation for an engine using only a single fuel and having a plurality of cylinders, comprising (i) a step of switching one or more of said plurality of cylinders between a first mode and a second mode, wherein in said first mode said one or more cylinders function as working cylinders while in said second mode said one or more cylinders function as reforming cylinders, and said step of switching is controlled by an electronic control unit in responding to loading conditions of the engine so that when the engine operates at a full loading condition all said plurality of cylinders of the engine are working cylinders while when the engine operates at a condition of less than a full load at least one of said plurality of cylinders functions as a reforming cylinder, (ii) a step of regulating relative fuel flows into working cylinders and cylinders that function as reforming cylinders and a step of regulating exhaust gas recirculation by mixing inlet fuel with varying amounts of exhaust gas from working cylinders and reformed fuel from reforming cylinders to condition fuel combustion of the engine according to conditions of engine load, and (iii) a step of transforming the fuel inside said reforming cylinder into intermediate oxidation products at varying transforming rates according to loading conditions of the engine and a step of introducing the transformed fuel from said reforming cylinder into said working cylinders via an exhaust gas recirculation loop in the engine.

Assignees

• Univ Tianjin

Inventors

• Yao Mingfa
• Wang Yang
• Jia Guorui
• Wang Hu
• Wei Lixia

Classifications

• F02M26/05

  High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor · CPC title

• F02M26/43

  in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine · CPC title

• F02B37/00

  Engines characterised by provision of pumps driven at least for part of the time by exhaust · CPC title

• F02B47/10

  Circulation of exhaust gas in closed or semi-closed circuits, e.g. with simultaneous addition of oxygen · CPC title

• F02M26/51

  EGR valves combined with other devices, e.g. with intake valves or compressors (combined with intake air throttles F02M26/64) · CPC title