Gm Global Technolgoy Operations, Inc.

Mingjie Tu

Yuntao Gu

Calvin Thomas

Patrick G Szymkowicz

Wei Li

An exhaust gas treatment system including a hydrocarbon storage model; and a controller operably connected to the hydrocarbon storage model, the controller configured to execute a method for determining a hydrocarbon storage level of a hydrocarbon trap, the method comprising determining a first reaction rate representing a rate of hydrocarbon adsorption at non-acidic sites of the hydrocarbon trap; determining a second reaction rate representing a rate of hydrocarbon desorption at non-acidic sites of the hydrocarbon trap; determining a third reaction rate representing a rate of hydrocarbon adsorption at acidic sites of the hydrocarbon trap; determining a fourth reaction rate representing a rate of hydrocarbon desorption at acidic sites of the hydrocarbon trap; and determining the hydrocarbon storage level in the hydrocarbon trap based on the first reaction rate, the second reaction rate, the third reaction rate, and the fourth reaction rate.

Exhaust gas treatment system and model for controlling hydrocarbon adsorption/desorption in hydrocarbon trap

An exhaust gas treatment system including: an internal combustion engine comprising an exhaust gas outlet; a first three way catalyst downstream of the exhaust gas outlet, wherein the first three way catalyst receives an exhaust output from the exhaust gas outlet; a hydrocarbon trap downstream of the first three way catalyst, wherein the hydrocarbon trap receives an exhaust output from the first three way catalyst; an exhaust heating unit downstream of the hydrocarbon trap, wherein the exhaust heating unit receives an exhaust output from the hydrocarbon trap; and a second three way catalyst downstream of the exhaust heating unit, wherein the second three way catalyst receives an exhaust output from the heating unit, wherein an air injection port is configured to selectively deliver a stream of air upstream of the hydrocarbon trap and downstream of the first three way catalyst.

Exhaust gas treatment system for controlling hydrocarbon adsorption/desorption in hydrocarbon trap

An exhaust system includes a light-off catalyst, an exhaust system component, and at least one HO trap. The exhaust system component is upstream from the light-off catalyst and includes catalyst material, the catalyst material configured to store hydrocarbons during a period when the light-off catalyst is warming up to a light-off temperature. The at least one HO trap is at or upstream from the exhaust system component and is configured to perform HO adsorption and desorption to increase a length of time for the exhaust system component to reach a hydrocarbon release temperature and prevent the exhaust system component from reaching the hydrocarbon release temperature prior to the light-off catalyst reaching the light-off temperature.

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Sterling Heights, MI, United States of America

Mingjie Tu