Ageing failure diagnosis method of engine catalytic converter

A catalytic converter and fault diagnosis technology, applied in engine components, combustion engines, machines/engines, etc., can solve problems such as limited objects of judgment, affecting the authenticity and accuracy of fault diagnosis results, and achieve the effect of improving reliability

Active Publication Date: 2012-03-14
南通奥易克斯科技有限公司
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Problems solved by technology

[0007] Disclosed in the U.S. Patent 6,694,243 is a diagnostic method for catalytic converter failures, in which the diagnostic process includes the judgment of diagnostic enabling conditions such as engine idle speed, but the objects of judgment are limited; in addit

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  • Ageing failure diagnosis method of engine catalytic converter
  • Ageing failure diagnosis method of engine catalytic converter
  • Ageing failure diagnosis method of engine catalytic converter

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[0020] In order to have a clearer understanding of the technical features, objects and effects of the invention, the specific embodiments of the invention will now be described with reference to the accompanying drawings, in which the same reference numerals denote the same parts.

[0021] exist Figure 4 In another exemplary embodiment of the engine catalytic converter fault diagnosis device, it includes an engine management unit 20, a catalytic converter aging diagnosis module 30 connected to the engine management unit 20, and a catalytic converter diagnosis module connected to the engine management unit 20. 30 and the OBD system management unit 40 of the engine management unit 20 .

[0022] The engine management unit 20 includes an engine operating condition input unit 21, a fuel closed-loop state control unit 22, an air-fuel ratio state control unit 23, a carbon canister solenoid valve control unit 24, an air-fuel ratio information input / output control unit 25, a The oxyg...

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Abstract

The invention provides an ageing failure diagnosis method of an engine catalytic converter, which comprises the steps of: enabling condition judgment, first stage monitoring, second stage monitoring, oxygen storage time calculation, diagnosis judgment and failure diagnosis report, wherein the oxygen storage time calculation also comprises a special diagnosis mode, and can fully consider various conditions generated during the failure diagnosis; judgment conditions are more complete and full and can send related information to an OBD failure diagnosis unit under the condition of incapability of diagnosis so as to be convenient for accurately diagnosing the state of the catalytic converter and preventing from generating error judgment, such as incapability of carrying out failure diagnosis.By using the method, reasons of incapability of carrying out failure diagnosis can be known.

Description

technical field [0001] The invention relates to a fault diagnosis method for an engine catalytic converter, in particular to a method for diagnosing an engine catalytic converter aging fault with an on-board diagnosis (OBD) function. Background technique [0002] In the engine online diagnosis (OBD) system, it is necessary to ensure the normal operation of the catalytic converter connected to the engine exhaust pipe. When the limit value is 0.4g / km, the OBD system warning light should light up and record the fault information. [0003] Typically, the diagnosis of catalytic converter degradation is based on detecting the oxygen storage time (OSC) of the catalytic converter. Such as figure 1 As shown, when the catalytic converter 10 is in a normal working state, the voltage output value of the upstream oxygen sensor 261 fluctuates up and down with the operating conditions of the engine, but the voltage output value of the downstream oxygen sensor 262 is basically a straight ...

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Application Information

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IPC IPC(8): F01N11/00F01N3/20
CPCY02T10/40
Inventor 张吉强姚国超
Owner 南通奥易克斯科技有限公司
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