# US 10,502,119 B2 · After treatment bypass for internal combustion engine during cold start and idle operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,119 B2 - Document ID: US10502119B2 - Status: Granted - Kind: B2 - Application number: 15/367,569 - Filed: 2016-12-02 - Published: 2018-06-07 - Granted: 2019-12-10 - Earliest claimed: 2016-12-02 - Assignees: Ge Global Sourcing LLC - Applicants: General Electric Company - Inventors: Adam Edgar Klingbeil - Web page: https://patentgrep.com/patent/US10502119B2 ## CPC - F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) - F01N 3/021: by means of filters - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 2410/03: in case of low temperature - F01N 2900/1602: Temperature of exhaust gas apparatus - F02D 41/064: {at cold start (F02D41/067 takes precedence)} - F02D 41/08: for idling (F02D41/06, F02D41/16 take precedence) - Y02T 10/40: Engine management systems - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Methods of operating an internal combustion engine that has two exhaust paths, the first path having an aftertreatment system. One method includes: operating the engine at idle; directing the exhaust flow through the first exhaust path; detecting an exhaust temperature below a predetermined temperature and/or operation of the engine at idle; and diverting all, or some, of the exhaust flow through the second exhaust path, based on the detecting. Another method includes detecting an engine condition that is indicative of an oil accumulation above a threshold and diverting the exhaust flow through the second exhaust path, based on detecting this engine condition. An exhaust subsystem that includes a controller that employs these methods is disclosed. ## Claims ### Claim 1 An exhaust subsystem for use with an internal combustion engine comprising: a first exhaust path having a first aftertreatment system; a second exhaust path parallel to the first exhaust path; a valve separating the first exhaust path from the second exhaust path; and a controller, in communication with the valve, configured to divert a portion of an exhaust flow from the first exhaust path to the second exhaust path responsive to a condition of piston rings of the engine. ### Claim 2 (depends on 1) The exhaust subsystem of claim 1, the second exhaust path having a second aftertreatment system. ### Claim 3 (depends on 1) The exhaust subsystem of claim 1, wherein the first aftertreatment system comprises at least one of: an SCR, a DOC, and a DPF. ### Claim 4 (depends on 1) The exhaust subsystem of claim 1, wherein the portion of the exhaust flow diverted from the first exhaust path is the entire exhaust flow generated by the engine. ### Claim 5 (depends on 1) The exhaust subsystem of claim 1, wherein the engine is configured to operate on one of: diesel and dual fuel. ### Claim 6 (depends on 1) An internal combustion engine comprising the exhaust subsystem of claim 1 in fluid communication with a plurality of cylinders. ### Claim 7 An exhaust subsystem for use with an internal combustion engine comprising: a first exhaust path having a first aftertreatment system, the first aftertreatment system including at least a particulate filter; a second exhaust path parallel to the first exhaust path, the second exhaust path including an inlet coupled at a first junction to an upstream portion of the first exhaust path and an outlet coupled at a second junction to a downstream portion of the first exhaust path; a valve positioned to control exhaust flow through the second exhaust path; and a controller, in communication with the valve, configured to divert a portion of an exhaust flow from the first exhaust path to the second exhaust path responsive to an age of piston rings of the engine, where no other aftertreatment systems are positioned in the first exhaust path upstream of the first junction or downstream of the second junction. ### Claim 8 (depends on 7) The exhaust subsystem of claim 7, wherein the first aftertreatment system further comprises an SCR and/or a DOC. ### Claim 9 (depends on 7) The exhaust subsystem of claim 7, wherein the portion of the exhaust flow diverted from the first exhaust path is an entire exhaust flow generated by the engine.