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Secondary air system of IC engine

A secondary air and internal combustion engine technology, applied to internal combustion piston engines, combustion engines, mechanical equipment, etc., can solve problems such as reducing system efficiency and limiting the average flow rate of secondary air

Active Publication Date: 2007-11-07
PIAGGIO & C SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The above factors of the prior art valve blades limit the mean flow rate of the secondary air, thus reducing the efficiency of the system

Method used

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  • Secondary air system of IC engine
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  • Secondary air system of IC engine

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Embodiment Construction

[0025] Referring to the drawings, a two-stroke or four-stroke type internal combustion engine 10 is provided with an engine body 11, in which an exhaust pipe 12 that delivers burned gas to a muffler is connected to the engine body 11, and the muffler is provided with a catalytic converter器13.

[0026] The internal combustion engine 10 is provided with a secondary air system 20, which includes a filter housing 21 which is equipped with an air filter (not shown), a valve 22 and a pipe 23 for supplying secondary air, The pipe 23 is connected to the exhaust pipe 12 through a pipe connector 14, and the pipe connector 14 is arranged at an upstream position of the muffler, and the muffler is provided with a catalytic converter 13.

[0027] The filter housing 21 of the secondary air system 20 is installed with a partition wall 24, which is fixed inside and used to divide the filter housing 21 into a first area 21' and a second area 21". The area communicates with the external environment,...

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Abstract

A secondary-air system for internal-combustion engines comprises a filter box (21) designed to house a valve (22), which divides the filter box (21) into a first area (21') connected to the environment and a second area (21'') connected to an exhaust pipe (12) of the internal-combustion engine, the valve (22) comprising at least one circular elastic membrane (27) for covering a plurality of openings (25), which are designed to set in communication the first area (21') with the second area (21'') of the filter box (21).

Description

Technical field [0001] The invention relates to a secondary air system of an internal combustion engine. Background technique [0002] The secondary air system of a two-stroke or four-stroke internal combustion engine has been known for some time to provide fresh air called secondary air into an exhaust pipe located upstream of a muffler with a catalytic converter. [0003] By increasing the oxygen in the exhaust gas that is in contact with the catalytic converter, the conversion of polluting chemicals such as carbon monoxide and unburned hydrocarbons can be greatly increased, thereby reducing harmful gas emissions into the environment. [0004] In order to handle the controlled inflow of air, various secondary air systems with automatic operation have therefore been proposed. [0005] One of the known systems includes a vane-type valve, which is used to allow fresh air from the surrounding environment to enter through the filter housing, so that the air continues to be sent to t...

Claims

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Application Information

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IPC IPC(8): F01N3/30
CPCY02T10/20F01N3/30F01N3/303Y02T10/12
Inventor 保罗·内斯蒂
Owner PIAGGIO & C SPA
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