Method and system for gasoline particulate filter operations

Abstract

The present invention relates to a method and system for gasoline particulate filter operations. Methods and systems are provided for optimal operation of a gasoline particulate filter coupled to an engine exhaust system. Based on engine operating conditions, a target soot level on the GPF may be determined, and one or more engine operating parameters may be adjusted to maintain the actual GPF soot level at the target level. In one example, if the actual GPF soot level is lower than the target level, one or more of a fuel injection timing and a fuel rail pressure may be adjusted to increase soot generation, and if the actual GPF soot level is higher than the target level, the GPF may be regenerated until the actual soot level reaches the target level.

Description

technical field [0001] The present invention relates generally to methods and systems for gasoline particulate filters coupled in engine exhaust. Background technique [0002] Engine combustion using gasoline fuel can produce particulate matter (PM) such as soot and aerosols that can be emitted into the atmosphere. To achieve emission compliance, a gasoline particulate filter (GPF) may be included in the engine exhaust to filter out exhaust PM before expelling the exhaust to the atmosphere. A higher efficiency GPF including denser filter meshes may be used for improved emission quality especially during cold start conditions. [0003] In order to maintain the efficiency of the exhaust system particulate filter, it may be necessary to regenerate the filter intermittently. One example method is shown in US Patent 9,027,333 by Neely et al., to regenerate a diesel particulate filter (DPF) in response to a soot level above a threshold. Specifically, regeneration is controlled ...

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Problems solved by technology

Therefore, the level of soot remaining on the filter after engine cold start regenerat

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