Method and system for improving catalytic efficiency of aging three-way catalyst

A three-way catalytic converter and catalytic efficiency technology, applied in the direction of machine/engine, fuel injection control, engine control, etc., can solve the early failure reporting time, increase user cost, oxygen closed-loop control target value catalytic converter efficiency window Single and other problems, to achieve the effect of dynamic correction, improvement of catalytic efficiency, and optimization of emissions

Active Publication Date: 2020-04-17
WEICHAI POWER CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing oxygen closed-loop control target value is relatively single for the efficiency window of the catalytic converter, which cannot reflect the optimal control law in the entire life cycle of the catalytic converter, resulting in high emissions from the catalytic converter in the aging state, and the failure time is too early. Increased user cost

Method used

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  • Method and system for improving catalytic efficiency of aging three-way catalyst
  • Method and system for improving catalytic efficiency of aging three-way catalyst
  • Method and system for improving catalytic efficiency of aging three-way catalyst

Examples

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Effect test

Embodiment 1

[0048] Such as Figure 1 to Figure 3 Commonly shown, a kind of method that improves aging three-way catalytic converter catalytic efficiency, comprises the following steps:

[0049] S1. Determine whether the catalytic converter is in a fresh state, a stable state or an aging state;

[0050] S2. Obtain the engine speed and load;

[0051] S3, according to the engine speed and load, look up the fresh state catalytic converter target excess air ratio map table ( image 3 In the first map), the target excess air coefficient λ is obtained 1 ; Find the target excess air ratio map table of the steady state catalyst ( image 3 In the second map), the target excess air coefficient λ is obtained 2 ; Find the target excess air coefficient map table of the aging state catalyst ( image 3 In the third map), the target excess air coefficient λ is obtained 3 ;

[0052] S4. According to the state of the catalytic converter and the running time of the catalytic converter, find the smooth...

Embodiment 2

[0082] Such as Figure 4 As shown, a system for improving the catalytic efficiency of an aging three-way catalytic converter includes an electronic control unit, a state detection unit electrically connected to the electronic control unit, a smoothing coefficient calculation unit, a data construction unit and an execution unit.

[0083] The state detection unit is used to determine the operating state of the catalytic converter and obtain the engine speed and load;

[0084] The smoothing coefficient calculation unit is used to find the smoothing coefficient curve from fresh to steady state according to the state of the catalytic converter and the running time of the catalytic converter, and obtain the first smoothing coefficient a 1 , and according to the state of the catalytic converter and the oxygen storage capacity of the catalytic converter, find the smoothing coefficient curve from the stable to the aging state, and find the second smoothing coefficient a 2 ; using the ...

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Abstract

The invention discloses a method and a system for improving catalytic efficiency of an aging three-way catalyst, and relates to the field of engines. According to the rotating speed and load of an engine, a target excess air coefficient lambda 1, a target excess air coefficient lambda 2 and a target excess air coefficient lambda 3 are looked up in tables; according to the status and operation timeof the catalyst, a first smoothness coefficient a1 is looped up in a from-fresh-to-stable-state smoothness coefficient curve; according to the status and oxygen storage amount of the catalyst, a second smoothness coefficient a2 is looked up in a from-stable-to-aging-state smoothness coefficient curve; a target excess air coefficient lambda 12 from the fresh state to the stable state is worked out; a target excess air coefficient lambda 23 from the stable state to the aging state is worked out; a dynamic target excess air coefficient lambda is built by utilizing all the target excess air coefficients; a catalyst efficiency window is adjusted by utilizing the dynamic target excess air coefficient lambda to realize dynamic correction of the efficiency window and enable the catalyst to operate within an optimal range so as to optimize discharging.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method and system for improving the catalytic efficiency of an aging three-way catalytic converter. Background technique [0002] With the upgrading of emission regulations, the emission limits of natural gas engines are becoming increasingly stringent. For equivalent combustion natural gas engines, the state of the catalytic converter plays a decisive role in the quality of emissions. Analysis of the aging process of the catalyst revealed that the efficiency window of the catalyst is wider and leaner when the catalyst is in a new state. After a period of time, when the oxygen storage capacity of the catalytic converter has not decreased significantly, the efficiency window of the catalytic converter gradually shifts to the rich direction. is in optimal condition. [0003] The three-way catalytic converter can achieve the optimal conversion efficiency when the engine's excess...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/02F02D41/14
CPCF02D41/0295F02D41/1401F02D2200/0814F02D2200/101F02D2200/10F02D2041/1411
Inventor 卫阳飞刘锡庆李维龙赵令辉
Owner WEICHAI POWER CO LTD
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