EP2260185A2 - Method for obtaining energy from an exhaust flow and motor vehicle - Google Patents
Method for obtaining energy from an exhaust flow and motor vehicleInfo
- Publication number
- EP2260185A2 EP2260185A2 EP09718002A EP09718002A EP2260185A2 EP 2260185 A2 EP2260185 A2 EP 2260185A2 EP 09718002 A EP09718002 A EP 09718002A EP 09718002 A EP09718002 A EP 09718002A EP 2260185 A2 EP2260185 A2 EP 2260185A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- exhaust gas
- pump
- working fluid
- evaporator
- mass flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/065—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle the combustion taking place in an internal combustion piston engine, e.g. a diesel engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K15/00—Adaptations of plants for special use
- F01K15/02—Adaptations of plants for special use for driving vehicles, e.g. locomotives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
- F01K23/101—Regulating means specially adapted therefor
Definitions
- the invention relates to a method for obtaining energy from an exhaust gas flow from an internal combustion engine and to a motor vehicle, in which such an exhaust gas flow is known to be available and the method can therefore be used.
- the exhaust gas from an internal combustion engine has a fairly high temperature, and it would seem desirable to use the heat energy contained in the exhaust gas. It makes sense to gain electrical energy by means of the heat energy in the exhaust gas. It makes sense here to resort to known from the field of power plants techniques.
- a so-called Clausius-Rankine cycle is used: A working fluid, usually water, is vaporized alternately at high pressure and condensed at low pressure. The high pressure is reduced in an expansion machine, in particular a turbine, with release of labor, so that electrical energy is recovered. After condensing in a condenser, the now-liquid working fluid is fed to the evaporator by means of a pump.
- the working fluid receives heat from another fluid via the so-called indirect heat transfer, in which the other fluid is separated from the working fluid via a dividing wall.
- said other fluid could be exactly the exhaust gas flow from the internal combustion engine. So far, however, difficulties in the realization result from the fact that the exhaust gas mass flow is variable and in particular depends on the current performance of the internal combustion engine. It therefore does not make sense to move the working fluid evenly in the Rankine cycle. It has already been thought of a regulation of the movement of the working fluid, which should take place as a function of measured values obtained on the working fluid, z. B. as a function of temperature, mass flow or pressure of the working medium. Due to the inertia of such a scheme, by the ratio of system internal volume to mass flow conditional, however, stable regulation of that kind has proved to be impracticable.
- EP 1 333 157 A1 It is actually described in EP 1 333 157 A1 that the exhaust gas flow from an internal combustion engine is used as the energy source for a Rankine cycle.
- two circulation systems are provided, in which the working fluids differ from one another by their boiling point.
- the pump power is variably adjustable. It is stated in EP 1 333 157 A1 that the efficiency of the recovery of heat energy from the exhaust gas flow can be set to the maximum.
- Object of the present invention to provide a method for recovering energy from an exhaust gas stream from an internal combustion engine, which is practicable, but simplified over the prior art.
- the object is achieved by a method having the features according to claim 1.
- To solve the problem also includes the provision of a motor vehicle with the features according to claim 6.
- a Clausius-Rankine cycle process for obtaining energy from an exhaust gas flow, heat energy being supplied to the working fluid in an evaporator from the exhaust gas flow.
- the transport performance of the pump is controlled as a function of at least one in the evaporator per time by each of the current exhaust gas flow transferable heat-determining size, thus adjusted by time variable.
- the invention is based on the recognition that it is possible to dispense with a regulation on the basis of in-circuit variables if the quantity of liquid working fluid transported to the evaporator is adapted to the current exhaust gas flow. If the exhaust gas flow provides more heat energy, the pumping capacity of the pump may be higher, and if the exhaust gas flow provides less heat energy, the pumping capacity of the pump may be lower.
- the heat energy provided is directly proportional to the exhaust gas mass flow, so that the transport capacity of the pump is preferably set as a function of at least this.
- a characteristic curve for a control variable determining the transport capacity of the pump can be used as a function of the exhaust gas mass flow when setting the transport capacity of the pump.
- Particularly preferred is additionally also taken into account the exhaust gas temperature.
- a map is preferably used, which reproduces a manipulated variable which determines the transport capacity of the pump, depending on exhaust gas mass flow and exhaust gas temperature.
- the exhaust gas mass flow does not have to be the actual measured variable.
- the exhaust gas mass flow is defined defined by the operation of the internal combustion engine.
- One or more variables determining the operation of the internal combustion engine can therefore also be determined, and a characteristic map can be provided for the internal combustion engine (a characteristic curve when only one variable is used), which reproduces the dependence of the exhaust gas mass flow on this variable. Therefore, based on a map of the or the determined size (s) can be closed to the exhaust gas mass flow and depending on this so estimated exhaust gas mass flow, the transport capacity of the pump can be set.
- the transport capacity of the pump is usually determined directly via a speed of the pump.
- the invention provides for the first time a motor vehicle with an internal combustion engine, in which a single Rankine cycle is used.
- the pump transport power is adjustable, namely according to the invention the adjustment of the pump transport performance just by control signals from a control device, and this control device is designed to transport the pump just as a function of at least one in the evaporator per time by the each current exhaust flow to control transferable heat energy determining size.
- the exhaust gas mass flow if appropriate also the temperature, is preferably used as the input variable for the control.
- the control device must receive signals which indicate the variables determining the operation of the internal combustion engine.
- the operation of the internal combustion engine is determined on the one hand by the amount of fuel injected into it and on the other hand by the supplied air. Both variables in turn depend on the setting of an accelerator pedal.
- the control is preferred with a Source coupled to a signal indicating the position of an accelerator pedal.
- This source may be in a electronically acting accelerator pedal, a sensor which detects the position of the accelerator pedal directly, wherein the signals from the sensor are then fed to a control device which controls the internal combustion engine (or the fuel and air supply to this).
- the above-mentioned source of the signals may include a measuring device for the gas flow.
- the motor vehicle comprises an internal combustion engine 10, in which fuel is burned, whereby exhaust gas is produced, which is discharged via an exhaust gas line 12.
- the exhaust gas in the exhaust pipe 12 is now used as an energy source for a Clausius-Rankine cycle.
- a working fluid in this case preferably water
- the water is pumped in the liquid state from a pump 14 to an evaporator 16.
- a transfer of heat energy from the exhaust gas to the water takes place, so that it is evaporated and brought to a high pressure.
- the steam is fed to a turbine 18, which is coupled to a generator 20.
- the water vapor relaxes when passing through the turbine 18, and the work done here is converted by the generator 20 into electrical energy.
- the water vapor After passing through the turbine 18, the water vapor is condensed to water in a condenser 22, with a heat transfer to a suitable coolant also taking place here.
- a suitable coolant also taking place here.
- This may be as well as the working fluid water, but which is separated from the working fluid by a partition wall in the condenser 22.
- This water can be passed through the radiator of the motor vehicle.
- the working fluid water is then returned to the pump 14 from the condenser 22.
- the rotational speed of the pump 14 is variably adjustable, namely, it is controlled by a control device 24.
- the control device 24 is to ensure that as much heat energy is transferred from the exhaust gas stream to the working fluid.
- the control device 24 can in particular use a characteristic map which describes the rotational speed of the pump as a function of exhaust gas mass flow and exhaust gas temperature. Since the control takes place as a function of the variables exhaust gas mass flow and exhaust gas temperature, the control device 24 must receive corresponding information signals.
- a suitable measuring device 26 may be provided in or on the exhaust gas line 12, which measures the exhaust gas mass flow and also the exhaust gas temperature.
- a sensor 28 may also detect the position of an accelerator pedal 30 of the motor vehicle, via which the amount of fuel which is supplied via an injection line 32 to the internal combustion engine 10, and the amount of air which is supplied via a line 34 to the internal combustion engine 10, is determined.
- the position of the accelerator pedal 30 therefore determines the operation of the internal combustion engine 10, and the exhaust gas mass flow is directly dependent on the position of the accelerator pedal 30, in part, the exhaust gas temperature.
- the control device can determine how large the exhaust gas mass flow or the exhaust gas temperature is, namely for this purpose in the control device 24 appropriate characteristics or maps stored that reflect a relationship of the position of the accelerator pedal 30 to the exhaust gas mass flow.
- a practicable solution is when it is deduced due to the position of the accelerator pedal 30 on the exhaust gas mass flow, and when the temperature of the exhaust gas flow is determined by the sensor 26.
- the system according to the invention causes the Rankine cycle to run very stably, especially during transient processes.
- the system can also be easily integrated into an existing rule solution system, eg.
- the controller 24 may be identical to the engine controller 10.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008012907A DE102008012907A1 (en) | 2008-03-06 | 2008-03-06 | Method for obtaining energy from an exhaust gas stream and motor vehicle |
PCT/EP2009/001287 WO2009109311A2 (en) | 2008-03-06 | 2009-02-24 | Method for obtaining energy from an exhaust flow and motor vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2260185A2 true EP2260185A2 (en) | 2010-12-15 |
Family
ID=40936279
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09718002A Withdrawn EP2260185A2 (en) | 2008-03-06 | 2009-02-24 | Method for obtaining energy from an exhaust flow and motor vehicle |
Country Status (5)
Country | Link |
---|---|
US (1) | US8572964B2 (en) |
EP (1) | EP2260185A2 (en) |
JP (1) | JP2011519398A (en) |
DE (1) | DE102008012907A1 (en) |
WO (1) | WO2009109311A2 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007062580A1 (en) * | 2007-12-22 | 2009-06-25 | Daimler Ag | Method for recovering a heat loss of an internal combustion engine |
DE102008053066A1 (en) * | 2008-10-24 | 2010-04-29 | Behr Gmbh & Co. Kg | Heat recovery system for motor vehicle, has Rankine-circuit provided with working medium, which is cooled to condensation temperature by condenser, where condensation temperature is not smaller than preset degree Celsius |
DE102009020615A1 (en) * | 2009-05-09 | 2010-11-11 | Daimler Ag | Exhaust gas heat recovery in motor vehicles |
FR2956153B1 (en) * | 2010-02-11 | 2015-07-17 | Inst Francais Du Petrole | DEVICE FOR MONITORING A LOW FREEZING WORK FLUID CIRCULATING IN A CLOSED CIRCUIT OPERATING ACCORDING TO A RANKINE CYCLE AND METHOD USING SUCH A DEVICE |
DE102010025185A1 (en) | 2010-06-26 | 2011-12-29 | Daimler Ag | Waste heat utilization device for use in piston engine of motor vehicle, has preheater arranged between compression machine and evaporator for preheating operating medium and removing heat from cooling circuit that cools engine |
DE102010042412A1 (en) * | 2010-10-13 | 2012-04-19 | Robert Bosch Gmbh | steam turbine |
CN102061970A (en) * | 2010-11-29 | 2011-05-18 | 北京丰凯换热器有限责任公司 | Method for generating power by utilizing tail gas of vehicle |
DE102011076405A1 (en) * | 2011-05-24 | 2012-11-29 | Robert Bosch Gmbh | Method for using the waste heat of an internal combustion engine |
DE102011115399A1 (en) | 2011-10-06 | 2013-04-11 | Daimler Ag | Motor vehicle has heat exchanger that is connected with cooling circuit in the transmission region to transfer heat to cooling circuit |
KR101399558B1 (en) * | 2012-11-16 | 2014-05-27 | 삼성중공업 주식회사 | Mass flow of exhaust gas measuring device and method thereof |
WO2015134672A1 (en) * | 2014-03-04 | 2015-09-11 | Wave Solar, Llc | Liquid piston engine |
DE102015008998A1 (en) | 2015-07-10 | 2017-01-12 | qpunkt Deutschland GmbH | Method for using the exhaust heat of an internal combustion engine in a motor vehicle in non-constant operating conditions |
DE102016005717A1 (en) | 2015-12-24 | 2017-01-26 | Daimler Ag | Device and method for using waste heat of an internal combustion engine in a motor vehicle |
US11156152B2 (en) | 2018-02-27 | 2021-10-26 | Borgwarner Inc. | Waste heat recovery system with nozzle block including geometrically different nozzles and turbine expander for the same |
DE102019217031A1 (en) * | 2019-11-05 | 2021-05-06 | Mahle International Gmbh | Method for using waste heat from a heat engine |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH310325A (en) | 1952-11-28 | 1955-10-15 | Saurer Ag Adolph | Engine brake on 4-stroke internal combustion engines. |
DE3428626A1 (en) | 1984-08-03 | 1986-02-13 | Daimler-Benz Ag, 7000 Stuttgart | Four-stroke internal combustion engine |
DE3839450A1 (en) | 1988-11-23 | 1990-05-31 | Daimler Benz Ag | ENGINE BRAKE WITH A THROTTLE VALVE IN THE CYLINDER HEAD OF THE INTERNAL COMBUSTION ENGINE |
DE4007287A1 (en) | 1990-03-08 | 1991-09-12 | Man Nutzfahrzeuge Ag | ENGINE BRAKE FOR AIR COMPRESSING ENGINE |
DE19505725C2 (en) | 1995-02-20 | 2000-04-27 | Daimler Chrysler Ag | Engine brake |
DE19634108C1 (en) | 1996-08-23 | 1997-08-21 | Daimler Benz Ag | Internal combustion engine with at least one throttle valve per cylinder |
IT1291490B1 (en) | 1997-02-04 | 1999-01-11 | C R F Societa Consotile Per Az | DIESEL CYCLE MULTI-CYLINDER ENGINE WITH VARIABLE ACTING VALVES |
JP2002115505A (en) | 2000-10-11 | 2002-04-19 | Honda Motor Co Ltd | Rankine cycle device of internal combustion engine |
EP1431523A4 (en) * | 2001-09-28 | 2005-03-16 | Honda Motor Co Ltd | Temperature control device of evaporator |
JP3901608B2 (en) * | 2002-07-24 | 2007-04-04 | 本田技研工業株式会社 | Rankine cycle equipment |
JP4119281B2 (en) | 2003-02-28 | 2008-07-16 | 本田技研工業株式会社 | Engine exhaust gas recirculation system |
WO2006023375A2 (en) | 2004-08-17 | 2006-03-02 | Jacobs Vehicle Systems, Inc. | Combined exhaust restriction and variable valve actuation |
FR2884555A1 (en) * | 2005-04-13 | 2006-10-20 | Peugeot Citroen Automobiles Sa | Vehicle IC engine energy recuperator has nitrogen oxide trap in exhaust line and Rankine cycle system with loop containing compressor and evaporator |
-
2008
- 2008-03-06 DE DE102008012907A patent/DE102008012907A1/en active Pending
-
2009
- 2009-02-24 WO PCT/EP2009/001287 patent/WO2009109311A2/en active Application Filing
- 2009-02-24 JP JP2010549036A patent/JP2011519398A/en active Pending
- 2009-02-24 EP EP09718002A patent/EP2260185A2/en not_active Withdrawn
-
2010
- 2010-09-03 US US12/807,454 patent/US8572964B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2009109311A3 * |
Also Published As
Publication number | Publication date |
---|---|
US8572964B2 (en) | 2013-11-05 |
US20110056203A1 (en) | 2011-03-10 |
WO2009109311A3 (en) | 2011-05-19 |
WO2009109311A2 (en) | 2009-09-11 |
JP2011519398A (en) | 2011-07-07 |
DE102008012907A1 (en) | 2009-09-10 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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Effective date: 20100907 |
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Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR |
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AX | Request for extension of the european patent |
Extension state: AL BA RS |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MERCZ, JOSEF, MARTIN Inventor name: KOCH, THOMAS Inventor name: GAERTNER, JAN |
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DAX | Request for extension of the european patent (deleted) | ||
R17D | Deferred search report published (corrected) |
Effective date: 20110519 |
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17Q | First examination report despatched |
Effective date: 20141127 |
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Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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18W | Application withdrawn |
Effective date: 20150521 |