Unlock instant, AI-driven research and patent intelligence for your innovation.

Fuel-air ratio control device for internal combustion engine

A control device and air-fuel ratio technology, applied in engine control, fuel injection control, internal combustion piston engine, etc., can solve the problem of insufficient purification of NOx

Inactive Publication Date: 2011-03-30
TOYOTA JIDOSHA KK
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned background technology, since the combustion air-fuel ratio is lean before the entire three-way catalytic device reaches the catalyst activation temperature, there is no problem when the in-cylinder temperature is low in the first half of the temperature rise, but when the in-cylinder temperature is relatively high in the second half of the temperature rise. , the exhaust gas contains a relatively large amount of NOx, which is released into the atmosphere without sufficient purification

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fuel-air ratio control device for internal combustion engine
  • Fuel-air ratio control device for internal combustion engine
  • Fuel-air ratio control device for internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] figure 1It is a schematic diagram showing a part of the exhaust system of an internal combustion engine. In the figure, 1 is a three-way catalytic device, 2 is a first temperature sensor for detecting the temperature near the upstream end of the exhaust gas of the three-way catalytic device 1, and 3 is a temperature sensor for detecting the temperature of the longitudinal central part of the three-way catalytic device 1 The second temperature sensor 4 is a third sensor for detecting the temperature near the exhaust gas downstream end of the three-way catalytic device 1 . The first temperature sensor 2 , the second temperature sensor 3 , and the third temperature sensor 4 respectively detect temperatures in the vicinity of the diameter centers of the respective longitudinal positions in the present embodiment.

[0025] The three-way catalytic device 1 satisfactorily purifies NOx, CO, and HC in the exhaust gas when the air-fuel ratio of the exhaust gas is near the theore...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a fuel-air ratio control device. When an engine is started up, the combustion fuel-air ratio is rendered lean as compared with the stoichiometrical fuel-air ratio. When only the upstream-side exhaust part of a three-way catalyst device disposed in an engine exhaust system has been judged to have been heated to a catalyst activation temperature, the combustion fuel-air ratiois rendered rich as compared with the stoichiometrical fuel-air ratio to raise the temperature of the downstream-side exhaust part of the three-way catalyst device.

Description

technical field [0001] The invention relates to an air-fuel ratio control device for an internal combustion engine. Background technique [0002] The exhaust gas (exhaust gas) of the internal combustion engine contains NOx, CO, and HC. In order to purify these substances, a three-way catalytic device is arranged in the exhaust system of the internal combustion engine. Because the three-way catalytic device cannot purify these substances well before the temperature is raised to the catalyst activation temperature, when the internal combustion engine with a low catalyst temperature is started, the three-way catalytic device must be heated to the catalyst activation temperature as soon as possible. [0003] For this reason, the following proposal has been proposed: Immediately after the start of the internal combustion engine, a sufficient amount of oxygen is contained in the exhaust gas by making the combustion air-fuel ratio leaner than the stoichiometric air-fuel ratio, and ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/06F01N3/20F01N3/24F02D45/00
CPCF01N2340/00F01N3/24F01N3/101F01N2430/06F02D41/0255Y02T10/22F02D2200/0802F02D41/0245Y02T10/26F02D41/025F01N3/2006F01N2560/14F01N2560/06Y02T10/12
Inventor 沟口紘晶藤原孝彦中田邦彦樱井健治一濑宏树河合将昭平田笃识
Owner TOYOTA JIDOSHA KK