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Secondary air supply system for internal combustion engine

一种二次空气、供应系统的技术，应用在内燃活塞发动机、燃烧发动机、机械设备等方向，能够解决二次空气流量误差等问题

Inactive Publication Date: 2014-09-10
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the secondary air flow rate is detected in a situation where the output voltage of the battery has decreased and accordingly the drive voltage for the air pump has decreased, the detected secondary air flow rate may have an error

Method used

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  • Secondary air supply system for internal combustion engine
  • Secondary air supply system for internal combustion engine
  • Secondary air supply system for internal combustion engine

Examples

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Embodiment Construction

[0036] (first embodiment) will refer to Figure 1 to Figure 9 A secondary air supply system for an internal combustion engine according to a first embodiment is described. In the present exemplary embodiment the internal combustion engine is arranged in a vehicle.

[0037] figure 1 is a schematic view of the internal combustion engine according to the present embodiment. In this embodiment the internal combustion engine is a multi-cylinder V-type gasoline engine. The internal combustion engine in this embodiment includes an engine body 1 , an exhaust gas control system 70 for purifying exhaust gas, and a secondary air supply system 30 . The left and right cylinders of the engine block 1 are respectively coupled to exhaust pipes 7a and 7b via mutually independent exhaust manifolds 4a and 4b. The exhaust gas control system 70 in this embodiment includes catalytic converters 5a and 5b, each of which supports a catalyst having an oxidation function. Catalytic converters 5a an...

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PUM

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Abstract

A secondary air supply system includes an electric air pump (9) that supplies secondary air to a location upstream of an exhaust gas purification catalyst arranged in an exhaust passage; a control valve that opens / closes a secondary air supply passage; a pressure detector (33) that detects a pressure between the pump (9) and the control valve; and a control unit (40) that detects a first pressure in a first operating state where the control valve is closed, and detects a second pressure in a second operating state where the control valve is open, using the pressure detector (33). The control unit (40) corrects at least one of the first and second pressures based on a first driving voltage for the pump (9) in the first operating state and a second driving voltage in the second operating state, and estimates a secondary air flow rate based on the first and second pressures after correction.

Description

technical field [0001] The invention relates to a secondary air supply system for an internal combustion engine. Background technique [0002] There is known an exhaust gas control system in which an exhaust purification catalyst is arranged in an engine exhaust passage of an internal combustion engine, and then carbon monoxide (hereinafter, referred to as "CO"), hydrocarbons (hereinafter, referred to as referred to as "HC") or nitrogen oxide (hereinafter, referred to as "NOx") components are purified. [0003] There is known a secondary air supply system in which the secondary air is fed under pressure from an air pump to a secondary air supply passage connected to an engine exhaust passage at a portion upstream of such an exhaust purification catalyst, the secondary air is It is supplied into the exhaust pipe to increase the oxygen concentration, and thereby HC and CO in the exhaust gas are oxidized, and accordingly the purification of the exhaust gas is promoted. In the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/22F01N3/32F01N9/00F01N13/04
CPCF01N3/22F01N13/011Y02T10/20Y02T10/47F01N2900/104F01N9/00F01N3/326F01N3/225F01N3/222Y02T10/12Y02T10/40
Inventor 近藤真也川村有辅梅泽幸司
Owner TOYOTA JIDOSHA KK
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