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Automotive catalyst excess oxygen reduction system

A technology of excess oxygen and fuel cut-off, applied in engine control, machine/engine, electrical control, etc., can solve problems such as fuel efficiency reduction

Inactive Publication Date: 2007-12-12
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However this method requires additional fuel and is therefore less fuel efficient

Method used

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  • Automotive catalyst excess oxygen reduction system
  • Automotive catalyst excess oxygen reduction system
  • Automotive catalyst excess oxygen reduction system

Examples

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Embodiment Construction

[0014] The following description of the preferred embodiment is merely exemplary in nature and in no way restricts the invention, its application or uses. For the sake of clarity, the same reference numbers refer to the same elements in the drawings. As used herein, the term module refers to an application-specific integrated circuit (ASIC), circuit, processor (shared, dedicated, or grouped) and memory, combinational logic circuit, and / or other suitable components that provide the described functionality.

[0015] Referring now to FIG. 1 , an automobile 10 includes an engine 12 that exhausts exhaust to an exhaust system 13 . Exhaust system 13 includes exhaust manifold 14 and catalytic converter 16 . Engine 12 includes N cylinders 18 . Although only six cylinders are shown in FIG. 1 (N=6), it will be appreciated that the engine 12 may include more or fewer cylinders 18 . For example, imagine engines with 4, 5, 6, 8, 10, 12 and 16 cylinders. Air enters engine 12 through int...

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Abstract

An excess oxygen reduction system includes a fuel cut-off condition module, an injector module, and a valve module. The fuel cut-off condition module determines whether a fuel cut-off condition exists. The injector module prevents a fuel injector from fueling a cylinder when said fuel cut-off condition exists. The valve module closes an impulse charging valve when said fuel cut-off condition exists.

Description

technical field [0001] This invention relates to automotive emissions, and more particularly to methods and apparatus for reducing excess oxygen in catalytic converters. Background technique [0002] During combustion in an internal combustion engine, fuel is oxidized and hydrogen (H) and carbon (C) combine with air. A wide variety of chemical compounds are formed, including carbon dioxide (CO 2 ), water (H 2 O), carbon monoxide (CO), nitrogen oxides (NO X ), unburned hydrocarbons (HC), sulfur oxides (SO X ) and other compounds. [0003] Automobile exhaust system generally includes reducing CO, HC and NO in exhaust X content of the catalytic converter, which chemically converts these gases into carbon dioxide (CO 2 ), nitrogen (N 2 ) and water. Catalytic converters have a property known as oxygen storage capacity (OSC). OSC refers to the catalytic converter's ability to store excess oxygen when lean and release oxygen when rich. [0004] When the car is operating i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00
CPCF02D41/123F02B29/083F02D17/02F02D41/0005F02D41/0275F02D2250/36Y02T10/146Y02T10/42Y02T10/12Y02T10/40
Inventor M·M·麦唐纳W·C·阿尔伯特森C·R·格拉哈姆
Owner GM GLOBAL TECH OPERATIONS LLC