Fca US LLC

Boopathi Singalandapuram Mahadevan

Jason E Wielenga

Steven L Talley

Simon O Omekanda

Joshua Macchiavello

Kevin C Ohlrogge

Yi Zheng

An exhaust system for a vehicle having an internal combustion engine includes an exhaust pipe configured to receive an exhaust gas flow from the engine at a predetermined first velocity, and an exhaust gas sensor assembly coupled to the exhaust pipe and in fluid communication with an interior of the exhaust pipe to sense a predetermined constituent contained within the exhaust gas flow. The exhaust gas sensor assembly includes a sensing element disposed at least partially within a protection tube assembly having a plurality of apertures configured to receive a sensor flow (SF) portion of the exhaust gas flow. The plurality of apertures has a combined total flow area that provides a surface averaged total velocity at the sensing element to be greater than or equal to 70% of the first velocity to thereby increase a dynamic response of the exhaust gas sensor assembly.

Gas sensor with protection tube for exhaust system

A control system for an engine of a vehicle includes one or more oxygen (O2) sensors disposed proximate to a three-way catalytic converter (TWC) in an exhaust system of the vehicle, the one or more O2 sensors each being configured to measure an O2 level of exhaust gas produced by the engine, and a controller in signal communication with the one or more O2 sensors. The controller is programmed to detect a fuel shut-off (FSO) event where the engine ceases providing fuel to the engine, determine an accumulated gas flow through the TWC during the FSO event, determine the FSO event has ended, and initiate a fuel enrichment event for a predetermined duration where the engine is supplied with a fuel enrichment level having a rich fuel/air ratio. The fuel enrichment level and the predetermined duration are chosen to reduce non-methane hydrocarbon (NMHC) emissions while maintaining NOx emission control.

System and method to reduce fuel cut enrichment non-methane hydrocarbon emissions

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Ann Arbor, MI, United States of America

Boopathi Singalandapuram Mahadevan