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Method for diagnosing aftertreatment system of spark ignition engine

A spark ignition, engine technology, applied in engine components, engine control, combustion engine, etc., can solve problems such as difficulty in diagnosing downstream binary probes

Pending Publication Date: 2022-07-08
RENAULT SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is more difficult to diagnose not only the catalytic converter but also downstream binary probes

Method used

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  • Method for diagnosing aftertreatment system of spark ignition engine
  • Method for diagnosing aftertreatment system of spark ignition engine

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Embodiment Construction

[0026] In the following description, the same reference numerals designate parts with the same or similar functions.

[0027] exist figure 1 , a drive device 1 capable of carrying out the method according to the invention is depicted in a non-limiting manner. The arrangement comprises a spark-ignition internal combustion engine 2 (operating in particular with gasoline), eg direct injection by means of fuel injectors (not shown) capable of injecting fuel into the different cylinders of the engine. This can be a naturally aspirated or supercharged engine. Without prejudice to the generality of the invention, it may also have other specific features (not shown), such as, for example, being associated with at least one circuit for partially recirculating the exhaust gas to the intake pipe. exist figure 1 In the example shown, the engine takes the form of an engine with four in-line cylinders.

[0028] To burn the fuel, the engine draws in air from the outside atmosphere, which...

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Abstract

The invention proposes a method for diagnosing an aftertreatment system of a spark ignition engine of a motor vehicle, the aftertreatment system comprising a three-way catalytic converter associated with a proportional upstream oxygen probe and a binary downstream probe. To diagnose the catalytic converter, its oxygen storage capacity (OSC) is calculated. According to the invention, the calculation is carried out during the phase of lifting the foot away from the accelerator pedal of the vehicle, at the beginning of which the oxygenating amount of the catalytic converter is observed to be less than 10% of its oxygen storage capacity. At this time, fuel injection is interrupted and a throttle body of the engine is opened. The oxygen storage capacity (OSC) is calculated until the downstream probe switches to a lean mixture. Before diagnosing the catalytic converter, it is diagnosed that both the upstream probe and the downstream probe are in good conditions in order to avoid false detections.

Description

technical field [0001] The present invention relates to a method for diagnosing an aftertreatment system of a spark ignition internal combustion engine. More precisely, the present invention relates to a method that makes it possible to diagnose a three-way catalytic converter and associated upstream oxygen probe and associated downstream oxygen probe mounted on the exhaust pipe of a spark ignition engine. The invention is particularly advantageously applicable to motor vehicle engines. Background technique [0002] The use of oxidation / reduction catalysis for the aftertreatment of polluting emissions from spark-ignition engines (which operate in particular on gasoline) is based on the management of the amount of oxygen (or oxygen storage (OS)) present in the catalytic converter, This amount of oxygen makes it possible to create a fluctuating reductant / oxidant environment for treating various types of polluting molecules, such as unburned hydrocarbons HC, carbon monoxide CO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/10
CPCF01N3/101F01N11/007F01N13/008F01N2430/00F01N2550/02F01N2560/025F01N2560/14F01N2900/08F01N2900/1624F01N2900/10F02D41/22F02D41/123F02D41/045F02D41/1441F02D41/1455Y02T10/40F01N11/002
Inventor M·阿隆索-罗德里格斯J-A·卡塞尔-库巴斯A·杰洛特C·奥托内利A·帕拉西奥斯-阿玛斯
Owner RENAULT SA
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