# US 2013/0152580 A1 · Method for Regulating Stable Operation of an Exhaust-Gas Turbocharger of an Internal Combustion Engine, and a Corresponding Apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0152580 A1 - Document ID: US20130152580A1 - Status: Published application - Kind: A1 - Application number: 13/766,818 - Filed: 2013-02-14 - Published: 2013-06-20 - Earliest claimed: 2010-08-18 - Assignees: KNORR-BREMSE Systeme fuer Nutzfahrzeuge GmbH - Inventors: Manuel MARX; Guang RAO - Web page: https://patentgrep.com/patent/US20130152580A1 ## CPC - F02B 47/08: the substances including exhaust gas - F02B 33/44: Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs - F02B 37/04: Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump - F02B 37/164: {the bypassed air being used in an auxiliary apparatus, e.g. in an air turbine} - F02D 23/00: Controlling engines characterised by their being supercharged - F02B 37/16: by bypassing charging air - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - Y02T 10/12: Improving ICE efficiencies - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - 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 A method and apparatus is provided for regulating stable operation of an exhaust-gas turbocharger of an internal combustion engine having a fresh-gas supply device, a switchover valve, a control device, a compressor for generating compressed air and an air-processing unit with a discharge valve. The compressor is operated in a suction intake mode in which the compressor is connected to an air inlet, and based on monitored operating parameters, the switchover valve switches the compressor from the suction intake mode into a pressure-charged in which the compressor is connected to an exhaust-gas turbocharger compressor. Based on monitored operating parameters when in the pressure-charged mode, the switchover valve switches the compressor from the pressure-charged mode into the suction intake mode. ## Claims ### Claim 1 A method for regulating stable operation of an exhaust-gas turbocharger of an internal combustion engine having a fresh-gas supply device, a switchover valve, a control device, a compressor for generating compressed air and an air-processing unit with a discharge valve, comprising the acts of: operating the compressor in a suction intake mode in which the switchover valve connects the compressor to an air inlet; monitoring operating parameters of the internal combustion engine, the air-processing unit and the exhaust-gas turbocharger when the compressor is in the suction intake mode; determining based on the monitored operating parameters whether to switch the switchover valve from the suction intake mode; switching the switchover valve to switch over the compressor from the suction intake mode to a pressure-charged mode in which the switchover valve connects the compressor to an exhaust-gas turbocharger compressor; and monitoring operating parameters of the internal combustion engine, the air-processing unit and the exhaust-gas turbocharger when the compressor is in the pressure-charged mode; determining based on the monitored operating parameters whether to switch the switchover valve from the pressure-charged mode; switching the switchover valve to switch over the compressor on the basis of the monitored operating parameters from the pressure-charged mode to the suction intake mode. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the monitoring of operating parameters includes monitoring a boost pressure and/or a mass flow of the exhaust-gas turbocharger compressor, and connecting an outlet of the compressor to atmosphere by opening the discharge valve. ### Claim 3 (depends on 2) The method as claimed in claim 2, wherein the discharge valve is opened in at least one of stages and continuously. ### Claim 4 (depends on 1) The method as claimed in claim 1, wherein the monitoring of operating parameters includes monitoring operation of the fresh-gas supply device, the switching-over of the compressor from the suction intake mode to the pressure-charged mode occurs when the fresh-gas supply device is activated, and the switching-over of the compressor from the pressure-charged mode to the suction intake mode occurs when the fresh-gas supply device is deactivated. ### Claim 5 (depends on 1) The method as claimed in claim 1, wherein the monitoring of operating parameters includes monitoring operation of the internal combustion engine to identify an internal combustion engine overrun operating phase, monitoring operation of the fresh-gas supply device, the switching-over of the compressor from the suction intake mode to the pressure-charged mode occurs when the fresh-gas supply device is deactivated at the beginning of the overrun phase, and the switching-over of the compressor from the pressure-charged mode to the suction intake mode occurs after the overrun phase operation ends. ### Claim 6 (depends on 1) The method as claimed in claim 1, wherein the monitoring of operating parameters includes monitoring operation of a waste gate valve of the exhaust-gas turbocharger; the switching-over of the compressor from the suction intake mode to the pressure-charged mode occurs when the waste gate valve is opened, and the switching-over of the compressor from the pressure-charged mode to the suction intake mode occurs after the waste gate valve is closed. ### Claim 7 An apparatus for carrying out a method for regulating stable operation of an exhaust-gas turbocharger of an internal combustion engine, having: a fresh-gas supply device for injecting additional air into the internal combustion engine when there is a requirement for transient power; a compressor for producing compressed air; an air-processing unit for the compressed air having a discharge valve; a switchover valve which connects the compressor to an air inlet in a suction intake mode of the compressor and connects the compressor to a compressor of the exhaust-gas turbocharger in a pressure-charged mode of the compressor; and a control device for controlling the switchover valve for regulating stable operation of an exhaust-gas turbocharger. ### Claim 8 (depends on 7) The apparatus as claimed in claim 7, wherein the control device controls operation of the discharge valve. ### Claim 9 (depends on 8) The apparatus as claimed in claim 8, wherein the control device is part of an engine controller or of the air-processing unit. ### Claim 10 (depends on 7) The apparatus as claimed in claim 7, wherein the fresh-gas supply device includes a throttle valve and an additional-air valve. ### Claim 11 (depends on 10) The apparatus as claimed in claim 10, wherein at least one of the throttle valve, the additional-air valve and the discharge valve are configured to be adjusted in at least one of stages and continuously.