# US 10,767,514 B2 · Waste-heat utilization assembly of an internal combustion engine, and method for operating the waste-heat utilization assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,514 B2 - Document ID: US10767514B2 - Status: Granted - Kind: B2 - Application number: 16/301,151 - Filed: 2017-04-12 - Published: 2019-07-04 - Granted: 2020-09-08 - Earliest claimed: 2016-05-10 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Derya Lindenmeier; Gregory Rewers; Michael Richter - Web page: https://patentgrep.com/patent/US10767514B2 ## CPC - F01K 23/065: {the combustion taking place in an internal combustion piston engine, e.g. a diesel engine} - F01K 13/003: {Arrangements for measuring or testing (in general G01)} - F01K 13/02: Controlling, e.g. stopping or starting - F01K 23/10: with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence) - F01N 5/02: the devices using heat - F01P 3/20: Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) - F02G 5/02: Profiting from waste heat of exhaust gases - F01N 2240/02: a heat exchanger - F01N 2390/00: Arrangements for controlling or regulating exhaust apparatus - F01N 2410/02: in case of high temperature, e.g. overheating of catalytic reactor - F01N 2900/08: said parameters being related to the engine - F01P 2060/14: Condenser - Y02T 10/12: Improving ICE efficiencies - F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D) - 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) - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) - F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract The invention relates to a waste-heat utilization assembly (1) of an internal combustion engine (50), comprising a working circuit (2) that conducts a working fluid. The working circuit (2) is equipped with a feed pump (6), an evaporator (10), an expansion machine (3) and a condenser (4) in the direction of flow of the working fluid. Additionally, the evaporator (10) is also arranged in an exhaust tract (53) of the internal combustion engine (50). The exhaust tract (53) is equipped with an exhaust bypass channel (61) parallel to the evaporator (10), and the exhaust tract (53) is equipped with an exhaust bypass valve (60), by means of which the distribution of the mass flow rate of the exhaust of the internal combustion engine (50) to the evaporator (10) and to the exhaust bypass channel (61) can be controlled. The waste-heat utilization assembly (1) further comprises a cooling device (20, 40, 30) which conducts a coolant, and the condenser (4) is arranged in the cooling device (20, 40, 30). Furthermore, at least one temperature sensor (37, 38, 41, 42, 43, 44) is arranged in the cooling device (20, 40, 30). ## Claims ### Claim 1 A waste-heat utilization assembly of an internal combustion engine, the waste-heat utilization assembly comprising: a control unit; and a working circuit configured to conduct a working medium; wherein the working medium flows in a direction through a feed pump, an evaporator, an expansion machine and a condenser arranged in the working circuit; wherein the evaporator is also arranged in an exhaust gas tract of the internal combustion engine; wherein an exhaust gas bypass channel is arranged in the exhaust gas tract parallel to the evaporator; wherein an exhaust gas bypass valve is configured to control a distribution of a mass flow of the exhaust gas of the internal combustion engine to the evaporator and to the exhaust gas bypass channel; wherein the waste-heat utilization assembly also comprises a cooling device configured to conduct a coolant; wherein the condenser is arranged in the cooling device, wherein a temperature sensor is arranged in the cooling device and is configured to measure an actual temperature; and wherein the control unit controls the exhaust gas bypass valve to have the actual temperature measured in the cooling device be less than or equal to a predetermined maximum temperature. ### Claim 2 (depends on 1) The waste-heat utilization assembly as claimed in claim 1, wherein the cooling device includes an engine cooling circuit that includes a coolant pump and at least one cooler. ### Claim 3 (depends on 2) The waste-heat utilization assembly as claimed in claim 2, wherein the internal combustion engine is arranged in the engine cooling circuit. ### Claim 4 (depends on 2) The waste-heat utilization assembly as claimed in claim 2, wherein the temperature sensor is arranged upstream of the condenser in the engine cooling circuit. ### Claim 5 (depends on 4) The waste-heat utilization assembly as claimed in claim 4, further comprising at least an additional temperature sensor arranged downstream of the condenser in the engine cooling circuit. ### Claim 6 (depends on 2) The waste-heat utilization assembly as claimed in claim 2, wherein the at least one cooler is furthermore arranged in a cooler air path; wherein the cooler air path comprises an additional temperature sensor. ### Claim 7 (depends on 2) The waste-heat utilization assembly as claimed in claim 2, further comprising at least an additional temperature sensor is arranged downstream of the condenser in the engine cooling circuit. ### Claim 8 (depends on 1) The waste-heat utilization assembly as claimed in claim 1, wherein the cooling device includes a cooler air path that includes at least one cooler. ### Claim 9 (depends on 8) The waste-heat utilization assembly as claimed in claim 8, wherein the temperature sensor is arranged upstream of the condenser in the cooler air path. ### Claim 10 (depends on 9) The waste-heat utilization assembly as claimed in claim 9, further comprising an additional temperature sensor arranged downstream of the condenser in the cooler air path. ### Claim 11 (depends on 8) The waste-heat utilization assembly as claimed in claim 8, further comprising an additional temperature sensor arranged downstream of the condenser in the cooler air path. ### Claim 12 A method for operating a waste-heat utilization assembly of an internal combustion engine, the waste-heat utilization assembly having: a working circuit conducting a working medium; wherein the working medium flows in a direction through a feed pump, an evaporator, an expansion machine and a condenser that are arranged in the working circuit; wherein the evaporator is also arranged in an exhaust gas tract of the internal combustion engine; wherein an exhaust gas bypass channel is arranged in the exhaust gas tract parallel to the evaporator; wherein an exhaust gas bypass valve distributes the exhaust gas mass flow to the evaporator and to the exhaust gas bypass channel; wherein the waste-heat utilization assembly also comprises a cooling device to conduct a coolant; wherein the condenser and a temperature sensor are arranged in the cooling device, the temperature sensor measuring an actual temperature, the method comprising: controlling the exhaust gas bypass valve with a control unit to have the actual temperature be less than or equal to a predetermined maximum temperature. ### Claim 13 (depends on 12) The method as claimed in claim 12, wherein the method further comprises providing the cooling device with at least one cooler and a cooler air path. ### Claim 14 (depends on 13) The method as claimed in claim 13, further comprising: providing a fan wheel positioned near the at least one cooler; detecting an actual rotation of the fan wheel via the control unit and actuating the exhaust gas bypass valve based on the actual rotation of the fan wheel. ### Claim 15 (depends on 12) The method as claimed in claim 12, wherein the method further comprises providing a coolant pump and at least one cooler positioned in the cooling device. ### Claim 16 (depends on 15) The method as claimed in claim 15, further comprising: arranging the cooler in a cooler air path, positioning an additional temperature sensor the cooler air path for transmitting actual signals to the control unit and actuating the exhaust gas bypass valve with the control unit based on the actual temperature and based on the actual signals from the additional temperature sensor. ### Claim 17 (depends on 12) The method as claimed in claim 12, further comprising: controlling the exhaust gas bypass valve using a map of operating states of the internal combustion engine that is stored in the control unit (5).