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System and method for detecting oxygen storage capacity of catalyst on stand

A technology of oxygen storage capacity and catalytic converter, applied in the field of oxygen storage capacity detection of catalytic converter, can solve the problems of large error and low test efficiency, and achieve the effect of reducing test cost, improving test efficiency and ensuring consistency

Active Publication Date: 2011-01-26
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low test efficiency and large error caused by testing the catalytic converter after it is installed on the vehicle in the prior art, the embodiment of the present invention proposes a system and a method for detecting the oxygen storage capacity of the catalytic converter on the bench. method

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  • System and method for detecting oxygen storage capacity of catalyst on stand
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Embodiment 1

[0045] The first embodiment of the present invention proposes a system for detecting the oxygen storage capacity of a catalytic converter on a bench, the structure of which is as follows figure 1 shown, including:

[0046] The front oxygen sensor 1 is arranged at the entrance of the catalytic converter 6;

[0047] A linear oxygen sensor 2 is arranged at the inlet of the catalytic converter 6;

[0048] The rear oxygen sensor 3 is arranged at the outlet of the catalytic converter 6;

[0049] Air-fuel ratio detector 4, connected to the linear oxygen sensor 2, for detecting real-time air-fuel ratio;

[0050] The control module 5 is used to receive the data of the air-fuel ratio detector 4, the front oxygen sensor 1 and the rear oxygen sensor 3; and according to the charging efficiency of the catalytic converter, the front oxygen sensor and the rear oxygen sensor The rich-lean transition time of the rear oxygen sensor, as well as the air-fuel ratio, calculates the oxygen storage...

Embodiment 2

[0053] The second embodiment of the present invention is improved on the basis of the first embodiment, and its structure is as follows: figure 2 shown, including:

[0054] The front oxygen sensor 3 is arranged at the entrance of the catalytic converter 5;

[0055] A linear oxygen sensor 4 is arranged at the inlet of the catalytic converter 5;

[0056] The rear oxygen sensor 6 is arranged at the outlet of the catalytic converter 5;

[0057] The air-fuel ratio detector 7 is connected to the linear oxygen sensor 4 for detecting the real-time air-fuel ratio;

[0058] The control module 11 is used to receive the data of the air-fuel ratio detector 7, the front oxygen sensor 3 and the rear oxygen sensor 6; and according to the charging efficiency of the catalytic converter 5, the front oxygen sensor 3 and the rear oxygen sensor The rich-lean switching time of the oxygen sensor 6 and the air-fuel ratio of the air-fuel ratio detector 7 are used to calculate the oxygen storage cap...

Embodiment 3

[0073] The third embodiment of the present invention proposes a method for detecting the oxygen storage capacity of a catalytic converter on a bench using the system described in the first and second embodiments, including:

[0074] Step 101. Install a front oxygen sensor and a linear oxygen sensor at the inlet of the catalytic converter of the engine, and install a rear oxygen sensor at the outlet of the catalytic converter, and connect the linear oxygen sensor to an air-fuel ratio detector.

[0075] Step 102. Control the engine to work to achieve a preset air-fuel ratio; and obtain the rich-lean conversion time and charging efficiency of the catalytic converter according to the detection values ​​of the front oxygen sensor and the rear oxygen sensor, and obtain the The air-fuel ratio detector detects the real-time air-fuel ratio of the catalytic converter.

[0076] Step 103, calculating the oxygen storage capacity of the catalytic converter according to the signal of the fro...

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Abstract

The invention provides a system and a method for detecting oxygen storage capacity of a catalytic converter on a stand, and belongs to the field of electromechanical control. The system of the embodiment of the invention comprises a front oxygen sensor, a linear oxygen sensor, a rear oxygen sensor, an air-fuel ratio detector and a control module. The method comprises the following steps of: controlling the operation of an engine to reach a preset air-fuel ratio; acquiring the air inflation efficiency and the air-fuel ratio of the catalytic converter according to the detection values of the front oxygen sensor and the rear oxygen sensor; and determining the thick-thin conversion time of the front and rear oxygen sensors according to the signals of the front and rear oxygen sensors, and calculating the oxygen storage capacity of the catalytic converter according to the air inflation efficiency and the air-fuel ratio. The oxygen storage capacity of the catalytic converter can be tested on the stand. Compared with the prior art in which the catalytic converter is arranged on a motor vehicle for testing, the invention has the advantages that: the test efficiency of the catalytic converter can be improved, and the test cost and the complexity of the test processes can be reduced. The error caused by artificial test can be reduced.

Description

technical field [0001] The invention relates to the field of electromechanical control, in particular to a system and method for detecting the oxygen storage capacity of a catalytic converter on a bench. Background technique [0002] The oxygen storage capacity (OSC) of the catalytic converter is one of the main performance indicators of the catalytic converter, so it needs to be tested before the motor vehicle leaves the factory. In the prior art, after the catalytic converter is installed on the vehicle, the catalytic converter on the motor vehicle is tested. [0003] In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art: [0004] After the catalytic converter is installed on the motor vehicle, it will be more difficult to replace the catalytic converter, and the test efficiency is low. Simultaneously, existing detection is to allow motor vehicle to carry out on the rotating hub. Since the v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007G01M19/00
CPCY02T10/47Y02T10/40
Inventor 罗琳张建波汪旻浩
Owner CHERY AUTOMOBILE CO LTD