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Engine exhaust purification arrangement

An exhaust gas purification device and engine technology, applied in the direction of exhaust devices, engine components, engine control, etc., can solve the problem of difficult calculation of catalyst oxygen storage

Inactive Publication Date: 2005-06-22
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this system has the drawback that it has proven difficult to accurately calculate the oxygen storage capacity of the catalyst using the computational methods that have been developed so far

Method used

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  • Engine exhaust purification arrangement
  • Engine exhaust purification arrangement
  • Engine exhaust purification arrangement

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Experimental program
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Embodiment Construction

[0030] with reference to the attached figure 1 , the exhaust pipe 2 of the engine 1 includes: a catalytic converter containing a catalyst 3; a front, wide-range air-fuel ratio sensor 4 (hereinafter referred to as a front A / F sensor); a rear oxygen sensor 5; and controller 6.

[0031] A throttle valve 8 , and an air flow meter 9 that detects the amount of intake air regulated by the throttle valve 8 are provided in an intake pipe 7 of the engine 1 . In addition, a crank angle sensor 12 for detecting the engine rotational speed of the engine 1 is provided.

[0032] The catalyst 3 included in the catalytic converter is of the type having a so-called "three-way" catalytic function, which purifies NOx, HC and CO with maximum efficiency when the atmosphere around the catalyst is at a stoichiometric air-fuel ratio. The carrier on which the catalyst is supported is coated with an oxygen storage material such as cerium oxide, and the catalytic material itself includes a function of s...

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PUM

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Abstract

Engine exhaust gas purification device. A controller (6) calculates an oxygen storage amount of a catalyst (3) as a high-speed component and a low-speed component, respectively, based on predetermined release / absorption characteristics. A target air-fuel ratio of the engine is calculated, and the air-fuel ratio of the engine is controlled so that the high-speed component remains constant. The air-fuel ratio of the engine (1) is limited by an upper limit and a lower limit so that the high-speed component converges to a target value, preventing variation in the air-fuel ratio, and also preventing damage to drivability and fuel cost performance. Also, after a lean operation due to a fuel cut, etc., the lower limit is lowered toward the rich side, and the oxygen storage amount is rapidly generated to converge on the target value.

Description

technical field [0001] The present invention relates to an engine exhaust gas purification device equipped with a catalyst, and more particularly, to an exhaust gas purification device for maintaining the air-fuel ratio in a catalytic converter at a chemical Control device under metering. Background technique [0002] JP-A-H9-228873 published by the Japan Patent Office in 1997 discloses a technique in which the amount of oxygen stored in a three-way catalyst is estimated from the amount of engine intake air and the air-fuel ratio of exhaust gas flowing into the catalyst (hereinafter "Oxygen Storage Amount"), and wherein engine air-fuel ratio control is performed so that the oxygen storage amount of the catalyst remains substantially constant. [0003] In order to maintain the NOx (nitrogen oxides), CO and HC (hydrocarbons) conversion efficiency of the three-way catalyst at the maximum or optimum value, the catalyst atmosphere must be maintained at the stoichiometric air-fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00F01N3/10F01N3/20F01N3/24F01N11/00F02D41/02F02D41/12F02D41/14
CPCF01N11/007F01N2550/02F02D41/0295F02D41/126F02D2200/0814F02D2200/0816Y02T10/12Y02T10/40F02D41/02
Inventor 角山雅智柿崎成章松野修
Owner NISSAN MOTOR CO LTD