Method and system for gas particulate filter

Abstract

Methods and systems are provided for diagnosing a particulate filter located in an exhaust runner of an engine cylinder. In one example, a method may include flowing exhaust from a first cylinder through a first particulate filter in a first runner, and flowing exhaust from a second cylinder through a second particulate filter in a second runner. The method may further include adjusting engine operation in response to particulate filter degradation, the particulate filter degradation distinguishing between degradation of the first and second particulate filters based on an exhaust pressure pulsation timing relative to combustion events.

Description

technical field [0001] The present invention generally relates to methods and systems for controlling a vehicle engine to selectively regenerate a gas particulate filter. Background technique [0002] Emissions aftertreatment devices are used to collect particulate matter from the exhaust gas of internal combustion engines. Specifically, the emission treatment device may include a particulate filter, an oxidation catalyst, and a nitrogen oxide (NOx) catalyst. There is a problem in the case of particulate filters because particulates, consisting primarily of carbon particulates, tend to clog the filter, thereby restricting the flow of exhaust gas. In order to periodically regenerate or purge a particulate filter, it is known to take measures that cause the exhaust gas temperature to increase above a predetermined level (eg above 600°C) in order to burn off the carbon accumulated in the filter particle. [0003] One method used to increase exhaust temperature may involve co...

AI Technical Summary

Problems solved by technology

As an example, these systems place the particulate filter outside the exhaust manifold and thus take advantage of increased engine tuning to raise exhaust temperatures and result in an overall decrease in fuel economy

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