# US 8,783,020 B2 · Exhaust system for internal combustion engines with particle filter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,020 B2 - Document ID: US8783020B2 - Status: Granted - Kind: B2 - Application number: 13/270,836 - Filed: 2011-10-11 - Published: 2012-05-24 - Granted: 2014-07-22 - Earliest claimed: 2010-11-18 - Assignees: Ford Global Technologies, LLC - Applicants: Moritz Klaus Springer; Helmut Hans Ruhland; Thomas Lorenz; Georg Louven; Jens Dunstheimer - Inventors: Moritz Klaus Springer; Helmut Hans Ruhland; Thomas Lorenz; Georg Louven; Jens Dunstheimer - Web page: https://patentgrep.com/patent/US8783020B2 ## CPC - F01N 3/30: Arrangements for supply of additional air (control, e.g. using by-passes or variable air pump drives, F01N3/22) - F01N 3/021: by means of filters - F01N 3/101: {Three-way catalysts} - 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 13/009: {having two or more separate purifying devices arranged in series} - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02T 10/12: Improving ICE efficiencies - 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) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An exhaust system for an internal combustion engine is provided. The system comprises an exhaust tract which is connectable to an outlet side of the internal combustion engine, at least one catalytic converter arranged in the exhaust tract downstream of the engine, a particle filter downstream of the at least one catalytic converter, and a secondary-air inlet port provided in the exhaust tract upstream of the particle filter for introducing compressed secondary air into the exhaust tract via at least one flutter valve. In this way, additional oxygen may be supplied to the particulate filter to perform filter regeneration. ## Claims ### Claim 1 An exhaust system for an internal combustion engine, comprising: an exhaust tract which is connectable to an outlet side of the internal combustion engine; at least one catalytic converter arranged in the exhaust tract downstream of the engine; a particulate filter downstream of the at least one catalytic converter; a secondary-air inlet port provided in the exhaust tract upstream of the particulate filter for introducing secondary air compressed by a turbocharger compressor into the exhaust tract via at least one flutter valve, wherein the compressed secondary air is introduced into the exhaust tract downstream of the at least one catalytic converter and upstream of the particulate filter; and a controller having non-transitory instructions executable to: adjust an opening of a compressor bypass valve based on the compressed secondary air introduced into the exhaust tract as controlled by the flutter valve, wherein the flutter valve is controlled by a controller to be blocked closed when a soot load of the particulate filter is below a threshold. ### Claim 2 (depends on 1) The exhaust system of claim 1, wherein the flutter valve is configured to open when air pressure of the compressed secondary air is greater than exhaust gas pressure in an exhaust outlet duct. ### Claim 3 (depends on 1) The exhaust system of claim 1, wherein during normal engine operation, the internal combustion engine is configured to direct exhaust gas produced during combustion from one or more cylinders to the at least one catalytic converter and the particulate filter via the exhaust tract. ### Claim 4 (depends on 3) The exhaust system of claim 3, wherein during engine overrun cutoff conditions, the internal combustion engine is configured to direct ambient air pumped through the one or more cylinders to the at least one catalytic converter and particulate filter via the exhaust tract. ### Claim 5 (depends on 1) The exhaust system of claim 1, wherein the flutter valve is controlled by a controller to be blocked closed when a temperature of the particulate filter is above a threshold. ### Claim 6 A method for controlling air flow in an engine, comprising: diverting a portion of intake air downstream of a turbocharger compressor to an exhaust tract upstream of a particulate filter and downstream of an exhaust catalyst via a flutter valve; and adjusting a compressor bypass valve coupled across the turbocharger compressor to increase bypass of the intake air around the turbocharger compressor as the flutter valve decreases the diverted portion of the intake air. ### Claim 7 (depends on 6) The method of claim 6, wherein diverting the portion of the intake air downstream of the turbocharger compressor to the exhaust tract upstream of the particulate filter further comprises diverting a portion of the intake air from a plenum through a secondary air passage coupled to the exhaust tract. ### Claim 8 (depends on 7) The method of claim 7, wherein diverting the portion of the intake air through the secondary air passage further comprises diverting the portion of the intake air through the secondary air passage controlled by the flutter valve. ### Claim 9 (depends on 8) The method of claim 8, further comprising blocking the flutter valve closed and opening the compressor bypass valve when a soot load of the particulate filter is below a threshold. ### Claim 10 (depends on 8) The method of claim 8, further comprising blocking the flutter valve closed and opening the compressor bypass valve when a temperature of the particulate filter is above a threshold. ### Claim 11 (depends on 6) The method of claim 6, further comprising directing intake air not diverted to the exhaust tract to one or more cylinders of the engine. ### Claim 12 A vehicle system, comprising: a direct-injected gasoline engine; a compressor driven by a turbine; an exhaust system including a particulate filter; and a controller having instructions executable to: divert a portion of intake air downstream of the compressor to the exhaust system upstream of the particulate filter via a flutter valve; and when the flutter valve decreases the diverted portion of the intake air, adjust a CBV to increase bypass of intake air around the compressor. ### Claim 13 (depends on 12) The system of claim 12, wherein the instructions are further executable to, when the portion of diverted intake air increases, adjust the CBV to decrease the bypass of the intake air around the compressor. ### Claim 14 (depends on 13) The system of claim 13, wherein the instructions are executable to adjust the CBV to decrease the bypass of intake air around the compressor in response to a pressure difference across the compressor. ### Claim 15 (depends on 12) The system of claim 12, wherein the instructions are further executable to, when the portion of diverted intake air increases, adjust the CBV to block the bypass of the intake air around the compressor. ### Claim 16 (depends on 12) The system of claim 12, wherein the instructions are executable to adjust the CBV to increase the bypass of intake air around the compressor in response to a pressure difference across the compressor. ### Claim 17 (depends on 12) The system of claim 12, wherein the instructions are executable to divert the portion of intake air downstream of the compressor to the exhaust system upstream of the particulate filter via the flutter valve. ### Claim 18 (depends on 17) The system of claim 17, wherein the instructions are executable to block the flutter valve from opening when a soot load of the particulate filter is below a first threshold and/or when a temperature of the particulate filter is above a second threshold, the system further comprising a three-way catalyst upstream of the particulate filter and upstream of where the diverted air is introduced in the exhaust system.