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Lean burn active ignition engine with aftertreatment system and method

An engine and engine system technology, applied in combustion engines, internal combustion piston engines, engine components, etc., can solve problems such as NOx reduction and reduction

Active Publication Date: 2013-10-09
CUMMINS INTPROP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if a gasoline engine utilizing TWC is operated under lean, out-of-stoichiometric conditions, the oxygen content increases to promote oxidation reactions, while NOx reduction will drop significantly

Method used

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  • Lean burn active ignition engine with aftertreatment system and method
  • Lean burn active ignition engine with aftertreatment system and method
  • Lean burn active ignition engine with aftertreatment system and method

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Embodiment Construction

[0012] Various aspects are described below with reference to exemplary embodiments for easy understanding of the present disclosure. However, the present disclosure should not be viewed as limited to these embodiments. Rather, these embodiments are provided so that this disclosure will be thorough and complete. Descriptions of well-known functions and constructions may not be provided for clarity and conciseness.

[0013] The present inventors have realized that it is possible to achieve this by utilizing an actively-ignition internal combustion engine (e.g., an engine utilizing gasoline, natural gas, ethylene-based fuels) running lean-burn conditions, with or without turbocharging, supercharging, or other means of boosting. Achieve significant fuel economy gains. As used herein, the term "active ignition engine" describes an engine in which an action is required to initiate combustion of the charge air / fuel mixture in the cylinders of the engine, such as a spark ignition (S...

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Abstract

An engine system including a lean burn active ignition engine and aftertreatment system, and a method for operating such a system, are disclosed. In a representative embodiment, the lean burn active ignition engine includes an engine block including plural cylinders, an intake manifold adapted to provide charge air to the cylinders, an exhaust manifold, an active ignition source; and fuel and air handling systems that provide fuel / charge air mixture such that an air-to-fuel ratio of the mixed charge air and fuel in each of the engine cylinders is substantially greater than a stoichiometric quantity to achieve a lean burn condition. An exhaust gas aftertreatment system is fluidly coupled to an outlet of the exhaust manifold and includes an oxidation-reduction catalyst, and a selective catalytic reduction (SCR) catalyst fluidly coupled to the oxidation-reduction catalyst and positioned downstream of the oxidation-reduction catalyst.

Description

technical field [0001] The present invention relates to lean burn active ignition engine systems, such as gasoline powered spark ignition engine systems, and more particularly, to lean burn active ignition engine and exhaust aftertreatment systems and methods of operation thereof. Background technique [0002] Automotive active-ignition internal combustion engines, such as spark-ignition gasoline engines, continue to dominate personal vehicle transportation. However, this type of engine has much lower fuel efficiency than diesel engines. Current gasoline engines use redox catalytic converters, e.g., three-way catalysts (TWC), which limit operation to stoichiometric conditions (i.e., 14.7:1 air / fuel ratio) to meet nitrogen oxides (NOx) , hydrocarbons (HC) and carbon monoxide (CO) emission standards. Under the stoichiometric air / gasoline mixture, TWC provides the reaction function that NOx is reduced to oxygen and nitrogen, and CO is oxidized to CO 2 While unburned HC is ox...

Claims

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Application Information

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IPC IPC(8): F01N3/10
CPCY02T10/24F02M43/00F01N3/208Y02T10/22F01N3/101F01N3/2066F01N3/2073F01N9/00F01N2410/00F01N2410/02Y02T10/12Y02T10/40
Inventor T·M·扬努舒尼斯M·H·戴恩
Owner CUMMINS INTPROP INC
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