EP2596224A1 - Drive system for a vehicle - Google Patents

Drive system for a vehicle

Info

Publication number
EP2596224A1
EP2596224A1 EP11729262.3A EP11729262A EP2596224A1 EP 2596224 A1 EP2596224 A1 EP 2596224A1 EP 11729262 A EP11729262 A EP 11729262A EP 2596224 A1 EP2596224 A1 EP 2596224A1
Authority
EP
European Patent Office
Prior art keywords
working medium
drive system
thermal energy
exhaust gas
energy
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Withdrawn
Application number
EP11729262.3A
Other languages
German (de)
French (fr)
Inventor
Jürgen Ringler
Marco Seifert
Wolfgang Strobl
Raymond Freymann
Andreas Eder
Matthias Linde
Johannes Liebl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP2596224A1 publication Critical patent/EP2596224A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B65/00—Adaptations of engines for special uses not provided for in groups F02B61/00 or F02B63/00; Combinations of engines with other devices, e.g. with non-driven apparatus
    • 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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
    • H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
    • H10N10/13—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects characterised by the heat-exchanging means at the junction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a drive system for a vehicle, having a mechanical and thermal energy-releasing internal combustion engine and a device for converting the thermal energy, according to the preamble of claim 1.
  • thermoelectric generator with which electrical energy can be obtained from the thermal energy present in the exhaust gas, for example according to the Seebeck effect, which is then no longer generated regeneratively with additional consumption of fuel got to.
  • EP 1573194 B1 discloses a heat engine which has a low-temperature circuit and a high-temperature circuit, each followed by switched relaxation device with the aid of the waste heat of the internal combustion engine generated mechanical work.
  • the object of the present invention is to refine the known drive system from the point of view of improving its overall efficiency.
  • the invention provides a drive system for a vehicle, comprising a mechanical and thermal energy releasing internal combustion engine and a device for converting the thermal energy, wherein the device for direct conversion of the thermal energy into electrical energy and for transmitting thermal energy to a for applying a Expansion device provided working medium is formed.
  • the device provided for utilizing the thermal energy dissipated by the internal combustion engine via the exhaust gas flow is designed both for directly converting the thermal energy into electrical energy and for transmitting thermal energy to a working medium, with which in turn Expander can be acted upon, so that with the device, the thermal energy can be converted into both electrical energy and into mechanical energy.
  • the heat present in the exhaust gas flow of the internal combustion engine can be advantageously used to generate both electric current which, for example, supports the on-board voltage network of the vehicle, as well
  • the overall efficiency of the drive system increases and it is additionally achieved the advantage of functional integration, since a vaporizer required for evaporation of the working medium is thus used simultaneously as a cooler for a component by means of which the thermal energy can be converted into electrical energy.
  • the component for converting the thermal energy into electrical energy may be a thermoelectric generator having surfaces heated by means of the thermal energy and surfaces cooled by means of the working medium such that the working medium assumes a vaporous state as a result of the application of heat.
  • the vaporous working medium after passage through the device provided according to the invention can then act on an expansion device, wherein the expansion device can be, for example, a piston machine with which a mechanically driven component is acted on the vehicle.
  • the device has a condensation device for the condensation of vaporous working medium after it has passed through an expansion device.
  • the then liquid working fluid is fed back to the device by means of a working medium in the circulation leading pump device, which then again using the residual energy available in the exhaust gas in the exhaust gas. stood convicted.
  • the device may be a heat exchanger which has first surfaces heated by the exhaust gas of the engine and second surfaces cooled by the working medium with thermoelectric pair of legs arranged therebetween and at least one inlet - for working fluid in the liquid state - and outlet - for Working medium in the vapor state - has and each having at least one inlet and outlet for the exhaust gas of the internal combustion engine, which enters the inlet, where the first surface is acted upon by the hot side of the pair of legs and discharged at a lower temperature at the outlet again.
  • the working medium is used for cooling the second surface and takes there thermal energy from the hot exhaust gas is largely isothermal and exits as a vapor phase from the device to be supplied to the above-mentioned expansion device.
  • the heat present in the exhaust gas for generating electrical and mechanical energy can be used combinatorially, whereby a total of the overall efficiency of the drive system according to the invention compared to known drive systems is significantly increased.
  • the invention also provides a method for utilizing the thermal energy contained in the exhaust gas of an internal combustion engine for conversion into electrical and mechanical energy by means of a thermoelectric generator and a steam Rankine process, wherein the heat absorption required for the evaporation of the working medium conducted in the steam cycle process is largely isothermal takes place and the heat is removed from the cold side of the heated exhaust gas thermoelectric generator. The transmitted from the exhaust of the engine to the working fluid
  • thermoelectric leg pair Heat passes through a large temperature gradient in the largely isothermal heat absorption by the working medium. Due to the temperature gradient during heat transfer to the working medium, a loss of exergy occurs. By attaching thermoelectric material on the hot and cold side of the heat exchanger, this exergy loss can be partially prevented, in such a way that caused by the largely isothermal heat absorption temperature gradient between the exhaust gas and working fluid - ie between the hot and cold side of the heat exchanger - to drive the thermoelectric leg pair is used.
  • Figure 1 is a perspective view of an embodiment of a device provided in the drive system according to the invention for the conversion of thermal energy into electrical energy and the heat application of an Arbettsmediums.
  • Fig. 2 is a schematic representation of a drive system according to the present invention.
  • FIG. 3 shows a diagram with the transferred heat quantity on the x-axis to explain the mode of operation of the drive system according to the invention.
  • Fig. 1 of the drawing shows a device 1 which shows an essential part of the drive system 2 according to the invention, which is shown in a schematic representation in Fig. 2 of the drawing.
  • a heat exchanger 3 having an inlet 4 for the hot exhaust gas from the position shown in Fig. 2 of the drawings internal combustion engine 5.
  • the heat exchanger 3 has an outlet 6, not shown in greater detail in the selected perspective view, for the exhaust gas cooled in the heat exchanger 3.
  • exhaust gas mass flow 7 passes over the Inlet 4 in the heat exchanger 3 a.
  • the hot exhaust gas mass flow 7 heats first surfaces 8 arranged in the heat exchanger 3, which correspond to the hot side of the thermoelectric generator 10 formed by thermoelectric leg pairs.
  • the thermoelectric pair of legs, not shown, are arranged between the respective hot first surfaces 8 and respective cooled second surfaces 9.
  • the working medium enters the heat exchanger 3 as a liquid mass flow 12 at an inlet 12, which is not shown in more detail because of the perspective view, where it cools the respective second surfaces 9, absorbs heat from the hot exhaust gas mass flow 7 in a largely isothermal process of heat transfer. is evaporated and exits at an outlet 14 as a vaporous mass flow from the heat exchanger 3 again.
  • FIG. 2 of the drawing shows the internal combustion engine 5, from which the hot exhaust gas mass flow 7 enters the heat exchanger 3.
  • the vaporous working medium veriässt the heat exchanger 3 and is supplied via a schematically illustrated fluid line 16 of the expansion device 11, there relaxed under pressure loss and converted into symbolically represented by an arrow 17 mechanical energy.
  • This can be used, for example, to drive a mechanically actuated component of the vehicle, not shown, or be coupled into the driveline of the vehicle.
  • the working medium After leaving the expansion device 11, the working medium is supplied via a fluid line 18 to a condenser 19 and there converted into the liquid phase with the removal of heat, as shown by the arrow 26.
  • a pump device 21 Via a fluid line 20, a pump device 21 suck the liquid working fluid and perform over another fluid line 22 back to the heat exchanger 3 and in this way lead the working fluid in a circle, such as this is shown by the arrow 23.
  • Fig. 3 of the drawing shows a diagram for explaining the invention.
  • the hot exhaust gas mass flow 7 enters the heat exchanger 3 at a high temperature of, for example, 520 ° Celsius shown by the reference numeral 24, heats up the hot side of the thermoelectric generator 10 there - this can be done, for example, by coating surfaces of the heat transfer medium
  • Working medium required heat exchanger 3 are provided with thermoelekt- rischer material - and gives off on its way to the outlet 6 of the heat exchanger 3 heat.
  • the exhaust gas leaves the heat exchanger 3 with a temperature of about 200 ° C shown by the reference numeral 25. This heat is transferred largely isothermally to a working medium, the heat transfer takes place at the cooled by the working medium cold Flä-.
  • the drive system according to the invention allows the combinatorial use of residual energy present in the exhaust gas for the provision of electrical energy in the context of a thermoelectric process and for the provision of mechanical energy in the context of a steam Rankine process.
  • the drive system according to the invention thus makes it possible to use the residual energy present in the exhaust gas of the internal combustion engine for the provision of electrical energy and mechanical energy in a coupled process.
  • the predominantly isothermal heat absorption during evaporation of the working medium also serves as a very efficient cooling for the cold side of the thermoelectric generator, so that the waste heat available in the exhaust gas can be almost completely used for conversion into useful energy and the amount of with the Ab- the environment of dissipated energy can be significantly reduced.

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

The invention relates to a drive system (1) for a vehicle, comprising an internal combustion (5) that releases mechanical and thermal energy and a device for converting the thermal energy, wherein the device (3) is designed to directly convert thermal energy into electrical energy and to transfer thermal energy to a working medium intended to act on an expansion apparatus (11).

Description

Antriebssystem für ein Fahrzeug  Drive system for a vehicle
Die vorliegende Erfindung betrifft ein Antriebssystem für ein Fahrzeug, mit einer mechanische und thermische Energie frei setzenden Brennkraftmaschine und einer Vorrichtung zur Wandlung der thermischen Energie, nach dem Oberbegriff des Anspruchs 1. The present invention relates to a drive system for a vehicle, having a mechanical and thermal energy-releasing internal combustion engine and a device for converting the thermal energy, according to the preamble of claim 1.
Bekannte Brennkraftmaschinen von Fahrzeugen weisen einen Wirkungsgrad auf, der trotz vielfacher Anstrengungen und sukzessiven Verbesserungen, wie beispielsweise voll variablen Ventilsteuerungen, Verbrennung mit Luftüberschuss und dergleichen im Bereich von maximal 40 % liegt, so dass im Umkehrschluss ein Großteil der im Kraftstoff gebundenen Energie als Abwärme an die Umgebung verloren geht. Ein großer Teil davon wird über das Abgas dissipiert. Known internal combustion engines of vehicles have an efficiency which despite multiple efforts and successive improvements, such as fully variable valve timing, combustion with excess air and the like is in the range of a maximum of 40%, so that in reverse a large part of the energy bound in the fuel as waste heat the environment is lost. A large part of it is dissipated via the exhaust gas.
Um diesem Umstand Rechnung zu tragen, wurden bereits Zusatzapplikationen am Fahrzeug vorgeschlagen, mit denen die im Abgas vorhandene Restenergie genutzt werden kann, um beispielsweise in elektrische Energie gewandelt das Bordspannungsnetz des Fahrzeugs zu unterstützen oder in mechanische Energie gewandelt zum Antrieb des Fahrzeugs in den Triebstrang eingekoppelt zu werden. Ein Vertreter der zuerst genannten Gattung der Zusatzapplikationen ist der ther- moelektrische Generator, mit dem aus der im Abgas vorhandenen thermischen Energie, beispielsweise nach dem Seebeck-Effekt, elektrische Energie gewonnen werden kann, die dann nicht mehr generatorisch unter zusätzlichem Verbrauch von Kraftstoff erzeugt werden muss. In order to take this circumstance into account, additional applications have already been proposed on the vehicle with which the residual energy present in the exhaust gas can be used to, for example, converted into electrical energy to support the on-board voltage network of the vehicle or converted into mechanical energy coupled to drive the vehicle in the drive train to become. A representative of the first-mentioned type of additional applications is the thermoelectric generator with which electrical energy can be obtained from the thermal energy present in the exhaust gas, for example according to the Seebeck effect, which is then no longer generated regeneratively with additional consumption of fuel got to.
Eine andere Zgsatzapplikation wird in der auf die Anmelderin zurückgehenden EP 1573194 B1 beschrieben, die eine Wärmekraftmaschine offenbart, die über einen Niedertemperaturkreislauf und einen Hochtemperaturkreislauf mit jeweils nachge- schalteter Entspannungseinrichtung unter Zuhilfenahme der Abwärme der Brennkraftmaschine mechanische Arbeit generiert. Another application of interest is described in applicant's EP 1573194 B1, which discloses a heat engine which has a low-temperature circuit and a high-temperature circuit, each followed by switched relaxation device with the aid of the waste heat of the internal combustion engine generated mechanical work.
Mit beiden Zusatzapplikationen kann der Gesamtwirkungsgrad des Antriebssys- tems bereits gesteigert werden, trotzdem besitzt das Antriebssystem Potenzial für weitere Verbesserungen, die bislang noch nicht erschlossen worden sind. With both additional applications, the overall efficiency of the drive system can already be increased, but the drive system still has potential for further improvements that have not yet been tapped.
Ausgehend hiervon liegt der vorliegenden Erfindung die Aufgabe zu Grunde, das bekannte Antriebssystem unter dem Gesichtspunkt der Verbesserung seiner Ge- samteffizienz weiterzubilden. Proceeding from this, the object of the present invention is to refine the known drive system from the point of view of improving its overall efficiency.
Die Erfindung weist zur Lösung dieser Aufgabe die im Anspruch 1 angegebenen Merkmale auf. Vorteilhafte Ausgestaltungen hiervon sind in den weiteren Ansprüchen beschrieben. To solve this problem, the invention has the features specified in claim 1. Advantageous embodiments thereof are described in the further claims.
Die Erfindung sieht ein Antriebssystem für ein Fahrzeug vor, mit einer mechanische und thermische Energie frei setzenden Brennkraftmaschine und einer Vorrichtung zur Wandlung der thermischen Energie, wobei die Vorrichtung zur direkten Wandlung der thermischen Energie in elektrische Energie und zur Übertragung thermischer Energie auf ein zur Beaufschlagung einer Expansionseinrichtung vorgesehenes Arbeitsmedium ausgebildet ist. The invention provides a drive system for a vehicle, comprising a mechanical and thermal energy releasing internal combustion engine and a device for converting the thermal energy, wherein the device for direct conversion of the thermal energy into electrical energy and for transmitting thermal energy to a for applying a Expansion device provided working medium is formed.
Es heißt dies mit anderen Worten, dass die zur Nutzung der von der Brennkraftmaschine über den Abgasstrom dissipierten thermischen Energie vorgesehene Vorrichtung sowohl zur direkten Wandlung der thermischen Energie in elektrische Energie als auch zur Übertragung von thermischer Energie auf ein Arbeitsmedium ausgebildet ist, mit dem wiederum eine Expansionseinrichtung beaufschlagt werden kann, so dass mit der Vorrichtung die thermische Energie sowohl in elektrische Energie als auch, in mechanische Energie umgewandelt werden kann. In other words, this means that the device provided for utilizing the thermal energy dissipated by the internal combustion engine via the exhaust gas flow is designed both for directly converting the thermal energy into electrical energy and for transmitting thermal energy to a working medium, with which in turn Expander can be acted upon, so that with the device, the thermal energy can be converted into both electrical energy and into mechanical energy.
Damit kann in vorteilhafter Weise die im Abgasstrom der Brennkraftmaschine vorhandene Wärme dazu genutzt werden, sowohl elektrischen Strom zu erzeugen, der beispielsweise das Bordspannungsnetz des Fahrzeugs unterstützt, als auch mechanische Energie bereitzustellen, die beispielsweise zum Antrieb des Fahrzeugs in den Triebstrang eingekoppelt werden kann oder zum Antrieb eines mechanisch betätigten Bauteils am Fahrzeug genutzt werden kann. Damit steigt der Gesamtwirkungsgrad des Antriebssystems an und es wird zusätzlich der Vorteil einer Funktionsintegration erreicht, da ein zum Verdampfen des Arbeitsmediums erforderlicher Verdampfer damit gleichzeitig als Kühler für ein Bauteil verwendet wird, mittels dem die thermische Energie in elektrische Energie umgewandelt werden kann. In this way, the heat present in the exhaust gas flow of the internal combustion engine can be advantageously used to generate both electric current which, for example, supports the on-board voltage network of the vehicle, as well To provide mechanical energy that can be coupled, for example, to drive the vehicle in the drive train or used to drive a mechanically operated component on the vehicle. Thus, the overall efficiency of the drive system increases and it is additionally achieved the advantage of functional integration, since a vaporizer required for evaporation of the working medium is thus used simultaneously as a cooler for a component by means of which the thermal energy can be converted into electrical energy.
Bei dem Bauteil zur Wandlung der thermischen Energie in elektrische Energie kann es sich um einen thermoelektrischen Generator handeln, der mittels der thermischen Energie beheizte Flächen, und mittels des Arbeitsmediums gekühlte Flächen besitzt derart, dass das Arbeitsmedium infolge der Wärmebeaufschlagung einen dampfförmigen Zustand einnimmt. The component for converting the thermal energy into electrical energy may be a thermoelectric generator having surfaces heated by means of the thermal energy and surfaces cooled by means of the working medium such that the working medium assumes a vaporous state as a result of the application of heat.
Hierdurch wird die bereits vorstehend erläuterte Funktionsintegration erreicht, die es ermöglicht, ansonsten als eigenständige diskrete Einheiten notwendige Bauteile, wie beispielsweise den Verdampfer und den Kühler, gemeinsam mit nur einem Bauteil darzustellen. As a result, the functional integration already explained above is achieved, which makes it possible to represent components otherwise necessary as discrete units, such as the evaporator and the cooler, together with only one component.
Das nach dem Durchtritt durch die nach der Erfindung vorgesehene Vorrichtung dampfförmige Arbeitsmedium kann dann eine Expansionseinrichtung beaufschlagen, wobei es sich bei der Expansionseinrichtung beispielsweise um eine Kolben- maschine handeln kann, mit der ein mechanisch angetriebenes Bauteil am Fahrzeug beaufschlagt wird. The vaporous working medium after passage through the device provided according to the invention can then act on an expansion device, wherein the expansion device can be, for example, a piston machine with which a mechanically driven component is acted on the vehicle.
Nach einer Weiterbildung der Erfindung ist es vorgesehen, dass die Vorrichtung eine Kondensationseinrichtung zur Kondensation von dampfförmigem Arbeitsme- dium nach dessen Durchtritt durch eine Expansionseinrichtung besitzt. Das dann flüssige Arbeitsmedium wird mittels einer das Arbeitsmedium im Kreislauf führenden Pumpeneinrichtung wieder der Vorrichtung zugeführt, die es dann wieder unter Ausnutzung der im Abgas vorhandenen Restenergie in den dampfförmigen Zu- stand überführt. According to a development of the invention, it is provided that the device has a condensation device for the condensation of vaporous working medium after it has passed through an expansion device. The then liquid working fluid is fed back to the device by means of a working medium in the circulation leading pump device, which then again using the residual energy available in the exhaust gas in the exhaust gas. stood convicted.
Nach einer Ausführungsform kann es sich bei der Vorrichtung um einen Wärmetauscher handeln, der vom Abgas der Brennkraftmaschine beheizte erste Flächen und vom Arbeitsmedium gekühlte zweite Flächen mit dazwischen angeordneten thermoelektrischen Schenkelpaaren aufweist und jeweils mindestens einen Einläse - für Arbeitsmedium im flüssigen Zustand - und Auslass - für Arbeitsmedium im dampfförmigen Zustand - besitzt und jeweils mindestens einen Einlass und Auslass für das Abgas der Brennkraftmaschine aufweist, welches in den Einlass eintritt, dort die erste Fläche mit der heißen Seite der Schenkelpaare beaufschlagt und mit niedrigerer Temperatur am Auslass wieder ausgetragen wird. According to one embodiment, the device may be a heat exchanger which has first surfaces heated by the exhaust gas of the engine and second surfaces cooled by the working medium with thermoelectric pair of legs arranged therebetween and at least one inlet - for working fluid in the liquid state - and outlet - for Working medium in the vapor state - has and each having at least one inlet and outlet for the exhaust gas of the internal combustion engine, which enters the inlet, where the first surface is acted upon by the hot side of the pair of legs and discharged at a lower temperature at the outlet again.
Das Arbeitsmedium wird zur Kühlung der zweiten Fläche benutzt und nimmt dort thermische Energie aus dem heißen Abgas weitgehend isotherm auf und tritt als dampfförmige Phase aus der Vorrichtung aus, um der vorstehend bereits genannten Expansionseinrichtung zugeführt zu werden. Auf diese Weise kann die im Abgas vorhandene Wärme zur Erzeugung elektrischer und mechanischer Energie kombinatorisch genutzt werden, wodurch insgesamt der Gesamtwirkungsgrad des erfindungsgemäßen Antriebssystems verglichen mit bekannten Antriebssystemen deutlich gesteigert wird. The working medium is used for cooling the second surface and takes there thermal energy from the hot exhaust gas is largely isothermal and exits as a vapor phase from the device to be supplied to the above-mentioned expansion device. In this way, the heat present in the exhaust gas for generating electrical and mechanical energy can be used combinatorially, whereby a total of the overall efficiency of the drive system according to the invention compared to known drive systems is significantly increased.
Die Erfindung schafft auch ein Verfahren zur Nutzung der im Abgas einer Brennkraftmaschine enthaltenen thermischen Energie zur Umwandlung in elektrische und mechanische Energie mittels eines thermoelektrischen Generators und eines Dampf-Rankine-Prozesses, wobei die zur Verdampfung des im Dampfkreispro- zess geführten Arbeitsmediums erforderliche Wärmeaufnahme weitgehend isotherm stattfindet und die Wärme der kalten Seite des vom Abgas erwärmten thermoelektrischen Generators entzogen wird. Die vom Abgas der Brennkraftmaschine auf das Arbeitsmedium übertrageneThe invention also provides a method for utilizing the thermal energy contained in the exhaust gas of an internal combustion engine for conversion into electrical and mechanical energy by means of a thermoelectric generator and a steam Rankine process, wherein the heat absorption required for the evaporation of the working medium conducted in the steam cycle process is largely isothermal takes place and the heat is removed from the cold side of the heated exhaust gas thermoelectric generator. The transmitted from the exhaust of the engine to the working fluid
Wärme durchläuft bei der weitgehend isothermen Wärmeaufnahme durch das Arbeitsmedium ein großes Temperaturgefälle. Durch das Temperaturgefälle bei der Wärmeübertragung auf das Arbeitsmedium ereignet sich ein Verlust an Exergie. Durch Anbringen von thermoelektrischem Material an der heißen und kalten Seite des Wärmeübertragers lässt sich dieser Exergieverlust teilweise verhindern, in der Art, dass das durch die weitgehend isotherme Wärmeaufnahme entstehende Temperaturgefälle zwischen Abgas und Arbeitsmedium - also zwischen heißer und kalter Seite des Wärmeübertragers - zum Antrieb der thermoelektrischen Schenkelpaare genutzt wird. Heat passes through a large temperature gradient in the largely isothermal heat absorption by the working medium. Due to the temperature gradient during heat transfer to the working medium, a loss of exergy occurs. By attaching thermoelectric material on the hot and cold side of the heat exchanger, this exergy loss can be partially prevented, in such a way that caused by the largely isothermal heat absorption temperature gradient between the exhaust gas and working fluid - ie between the hot and cold side of the heat exchanger - to drive the thermoelectric leg pair is used.
Die Erfindung wird im Folgenden anhand der Zeichnung näher erläutert. Diese zeigt in: The invention will be explained in more detail below with reference to the drawing. This shows in:
Fig. 1 eine perspektivische Darstellung einer Ausführungsform einer im erfindungsgemäßen Antriebssystem vorgesehenen Vorrichtung für die Umwandlung thermischer Energie in elektrische Energie und die Wärmebeaufschlagung eines Arbettsmediums; Figure 1 is a perspective view of an embodiment of a device provided in the drive system according to the invention for the conversion of thermal energy into electrical energy and the heat application of an Arbettsmediums.
Fig. 2 eine schematische Darstellung eines Antriebssystems nach der vorliegenden Erfindung; und Fig. 2 is a schematic representation of a drive system according to the present invention; and
Fig. 3 ein Diagramm mit der übertragenen Wärmemenge auf der x-Achse zur Er- läuterung der Funktionsweise des erfindungsgemäßen Antriebssystems. 3 shows a diagram with the transferred heat quantity on the x-axis to explain the mode of operation of the drive system according to the invention.
Fig. 1 der Zeichnung zeigt eine Vorrichtung 1 , die einen wesentlichen Bestandteil des erfindungsgemäßen Antriebssystems 2 zeigt, welches in einer schematischen Darstellung in Fig. 2 der Zeichnung gezeigt ist. Fig. 1 of the drawing shows a device 1 which shows an essential part of the drive system 2 according to the invention, which is shown in a schematic representation in Fig. 2 of the drawing.
Bei der in Fig. 1 dargestellten Vom'chtung handelt es sich um einen Wärmetauscher 3, der einen Einlass 4 für das heiße Abgas aus der in Fig. 2 der Zeichnung dargestellten Brennkraftmaschine 5 aufweist. An der dem Einlass 4 gegenüberliegenden Stirnfläche besitzt der Wärmetauscher 3 einen, bei der gewählten per- spektivischen Darstellung nicht näher ersichtlichen, Auslass 6 für das im Wärmetauscher 3 gekühlte Abgas. In the illustrated in Fig. 1 of the 'rect is a heat exchanger 3 having an inlet 4 for the hot exhaust gas from the position shown in Fig. 2 of the drawings internal combustion engine 5. At the end face opposite the inlet 4, the heat exchanger 3 has an outlet 6, not shown in greater detail in the selected perspective view, for the exhaust gas cooled in the heat exchanger 3.
Der aus der Brennkraftmaschine 5 stammende Abgasmassenstrom 7 tritt über den Einlass 4 in den Wärmetauscher 3 ein. Der heiße Abgasmassenstrom 7 heizt im Wärmetauscher 3 angeordnete erste Flächen 8 auf, die der heißen Seite des von thermoelektrischen Schenkelpaaren gebildeten thermoelektrischen Generators 10 entsprechen. Die nicht näher dargestellten thermoelektrischen Schenkelpaare sind zwischen den jeweiligen heißen ersten Flächen 8 und jeweiligen gekühlten zweiten Flächen 9 angeordnet. The originating from the internal combustion engine 5 exhaust gas mass flow 7 passes over the Inlet 4 in the heat exchanger 3 a. The hot exhaust gas mass flow 7 heats first surfaces 8 arranged in the heat exchanger 3, which correspond to the hot side of the thermoelectric generator 10 formed by thermoelectric leg pairs. The thermoelectric pair of legs, not shown, are arranged between the respective hot first surfaces 8 and respective cooled second surfaces 9.
Die Kühlung der jeweiligen zweiten. Flächen 9 erfolgt dabei über ein Arbeitsmedium der in Fig. 2 der Zeichnung dargestellten Expansionseinrichtung 11 in der Form beispielsweise einer Kolbenmaschine. The cooling of the respective second . Areas 9 takes place via a working medium of the expansion device 11 shown in Fig. 2 of the drawing in the form of a piston engine, for example.
Das Arbeitsmedium tritt als flüssiger Massenstrom 12 an einem aufgrund der perspektivischen Darstellung nicht näher ersichtlichen Einlass 12 in den Wärmetauscher 3 ein, kühlt dort die jeweiligen zweiten Flächen 9, nimmt vom heißen Ab- gasmassenstrom 7 in einem weitgehend isotherm ablaufenden Prozess der Wärmeübertragung Wärme auf, wird verdampft und tritt an einem Auslass 14 als dampfförmiger Massenstrom aus dem Wärmetauscher 3 wieder aus. The working medium enters the heat exchanger 3 as a liquid mass flow 12 at an inlet 12, which is not shown in more detail because of the perspective view, where it cools the respective second surfaces 9, absorbs heat from the hot exhaust gas mass flow 7 in a largely isothermal process of heat transfer. is evaporated and exits at an outlet 14 as a vaporous mass flow from the heat exchanger 3 again.
Fig. 2 der Zeichnung zeigt die Brennkraftmaschine 5, von der ausgehend der hei- ße Abgasmassenstrom 7 in den Wärmetauscher 3 eintritt. Das dampfförmige Arbeitsmedium veriässt den Wärmetauscher 3 und wird über eine schematisch dargestellte Fluidleitung 16 der Expansionseinrichtung 11 zugeführt, dort unter Druckverlust entspannt und in durch einen Pfeil 17 symbolisch dargestellte mechanische Energie konvertiert. Diese kann beispielsweise zum Antrieb eines mechanisch be- tätigten Bauteils des nicht näher dargestellten Fahrzeugs verwendet werden oder in den Triebstrang des Fahrzeugs eingekoppelt werden. FIG. 2 of the drawing shows the internal combustion engine 5, from which the hot exhaust gas mass flow 7 enters the heat exchanger 3. The vaporous working medium veriässt the heat exchanger 3 and is supplied via a schematically illustrated fluid line 16 of the expansion device 11, there relaxed under pressure loss and converted into symbolically represented by an arrow 17 mechanical energy. This can be used, for example, to drive a mechanically actuated component of the vehicle, not shown, or be coupled into the driveline of the vehicle.
Das Arbeitsmedium wird nach dem Verlassen der Expansionseinrichtung 11 über eine Fluidleitung 18 einem Kondensator 19 zugeführt und dort unter Abfuhr von Wärme - wie dies durch den Pfeil 26 dargestellt ist - in die flüssige Phase konvertiert. Über eine Fluidleitung 20 kann eine Pumpeneinrichtung 21 das flüssige Arbeitsmedium ansaugen und über eine weitere Fluidleitung 22 wieder dem Wärmetauscher 3 zuführen und auf diese Weise das Arbeitsmedium im Kreis führen, wie dies durch den Pfeil 23 dargestellt ist. After leaving the expansion device 11, the working medium is supplied via a fluid line 18 to a condenser 19 and there converted into the liquid phase with the removal of heat, as shown by the arrow 26. Via a fluid line 20, a pump device 21 suck the liquid working fluid and perform over another fluid line 22 back to the heat exchanger 3 and in this way lead the working fluid in a circle, such as this is shown by the arrow 23.
Fig. 3 der Zeichnung zeigt ein Diagramm zur Erläuterung der Erfindung. Der heiße Abgasmassenstrom 7 tritt mit einer durch das Bezugszeichen 24 dargestellten hohen Temperatur von beispielsweise 520° Celsius in den Wärmetauscher 3 ein, heizt dort die heiße Seite des thermoelektrischen Generators 10 auf - dieser kann beispielsweise durch eine Beschichtung von Flächen des für die Wärmeübertragung auf das Arbeitsmedium erforderlichen Wärmetauschers 3 mit thermoelekt- rischem Material bereitgestellt werden - und gibt auf seinem Weg zum Auslass 6 des Wärmetauschers 3 Wärme ab. Schließlich verläset das Abgas den Wärmetauscher 3 mit einer durch das Bezugszeichen 25 dargestellten Temperatur von etwa 200° Celsius. Diese Wärme wird weitgehend isotherm auf ein Arbeitsmedium übertragen, die Wärmeübertragung findet an der durch das Arbeitsmedium gekühlten kalten Flä- .che 9 des Wärmetauschers 3 statt und das Arbeitsmedium wird hier unter Überdruck verdampft. Das dampfförmige Arbeitsmedium treibt die in Fig. 2 der Zeichnung dargestellte Expansionseinrichtung 11 an und wird hierbei abgekühlt. Das erfindungsgemäße Antriebssystem ermöglicht die kombinatorische Nutzung der im Abgas vorhandenen Restenergie zur Bereitstellung von elektrischer Energie im Rahmen eines thermoelektrischen Prozesses und zur Bereitstellung von mechanischer Energie im Rahmen eines Dampf-Rankine-Prozesses. Fig. 3 of the drawing shows a diagram for explaining the invention. The hot exhaust gas mass flow 7 enters the heat exchanger 3 at a high temperature of, for example, 520 ° Celsius shown by the reference numeral 24, heats up the hot side of the thermoelectric generator 10 there - this can be done, for example, by coating surfaces of the heat transfer medium Working medium required heat exchanger 3 are provided with thermoelekt- rischer material - and gives off on its way to the outlet 6 of the heat exchanger 3 heat. Finally, the exhaust gas leaves the heat exchanger 3 with a temperature of about 200 ° C shown by the reference numeral 25. This heat is transferred largely isothermally to a working medium, the heat transfer takes place at the cooled by the working medium cold Flä-. 9 of the heat exchanger 3 and the working fluid is evaporated here under pressure. The vaporous working medium drives the expansion device 11 shown in FIG. 2 of the drawing and is thereby cooled. The drive system according to the invention allows the combinatorial use of residual energy present in the exhaust gas for the provision of electrical energy in the context of a thermoelectric process and for the provision of mechanical energy in the context of a steam Rankine process.
Das erfindungsgemäße Antriebssystem ermöglicht es somit, die im Abgas der Brennkraftmaschine vorhandene Restenergie zur Bereitstellung elektrischer Energie und mechanischer Energie in einem gekoppelten Prozess zu nutzen. Die überwiegend isotherme Wärmeaufnahme beim Verdampfen des Arbeitsmediums dient gleichzeitig als sehr effiziente Kühlung für die kalte Seite des thermoelektrischen Generators, so dass die im Abgas verfügbare Abwärme fast vollständig zur Umwandlung in Nutzenergie genutzt werden kann und die Menge an mit dem Ab- die Umwelt dissipierter Energie deutlich verringert werden kann. The drive system according to the invention thus makes it possible to use the residual energy present in the exhaust gas of the internal combustion engine for the provision of electrical energy and mechanical energy in a coupled process. The predominantly isothermal heat absorption during evaporation of the working medium also serves as a very efficient cooling for the cold side of the thermoelectric generator, so that the waste heat available in the exhaust gas can be almost completely used for conversion into useful energy and the amount of with the Ab- the environment of dissipated energy can be significantly reduced.
Hinsichtlich vorstehend im Einzelnen nicht näher erläuterter Merkmale der Erfindung wird im Übrigen ausdrücklich auf die Ansprüche und die Zeichnung verwie- sen. With regard to features of the invention which are not explained in greater detail above, reference is expressly made to the claims and the drawings, moreover.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1. Vorrichtung 1. Device
2. Antriebssystem  2nd drive system
3. Wärmetauscher  3. heat exchanger
4. Einlass  4th inlet
5. Brennkraftmaschine  5. Internal combustion engine
6. Auslass  6. outlet
7. Abgasmassenstrom  7. exhaust gas mass flow
8. erste Fläche  8. first surface
9. zweite Fläche  9. second surface
10. thermoelektrischer Generator  10. thermoelectric generator
11. Expansionseinrichtung  11. Expansion device
12. Einlass  12th inlet
13. flüssiger Massenstrom Arbeitsmedium 13. liquid mass flow working medium
14. Auslass 14. outlet
15. dampfförmiger Massenstrom Arbeitsmedium 15. vaporous mass flow working medium
16. Fluidleitung 16. fluid line
17. mechanische Energie  17. mechanical energy
18. Fluidleitung  18. fluid line
19. Kondensator  19. Capacitor
20. Fluidleitung  20. fluid line
21. Pumpe  21. pump
22. Fluidleitung  22nd fluid line
23. Pfeil  23. arrow
24. Temperatur am Abgaseinlass  24. Temperature at the exhaust inlet
25. Temperatur am Abgasauslaß  25. Temperature at the exhaust outlet
26. Pfeil  26. arrow

Claims

Patentansprüche claims
1. Antriebssystem (2) für ein Fahrzeug, mit einer mechanische und thermische Energie frei setzenden Brennkraftmaschine (5) und einer Vorrichtung (1 , 3) zur Wandlung der thermischen Energie, dadurch gekennzeichnet, dass die Vorrichtung (3) zur direkten Wandlung der thermischen Energie in elektrische Energie und zur Übertragung thermischer Energie auf ein zur Beaufschlagung einer Ex- pansionseinrichtung (11) vorgesehenes Arbeitsmedium ausgebildet ist. 1. Drive system (2) for a vehicle, with a mechanical and thermal energy releasing internal combustion engine (5) and a device (1, 3) for converting the thermal energy, characterized in that the device (3) for direct conversion of the thermal Energy is converted into electrical energy and for transmitting thermal energy to a working medium provided for acting on an expansion device (11).
2. Antriebssystem nach Anspruch 1 , dadurch gekennzeichnet, dass die Vorrichtung (3) einen thermpelektrischen Generator (10) aufweist mit mittels der thermischen Energie beheizten Flächen (8) und mittels des Arbeitsmediums gekühlten Flächen (9) derart, dass das Arbeitsmedium infolge der Wärmebeaufschlagung einen dampfförmigen Zustand einnimmt. 2. Drive system according to claim 1, characterized in that the device (3) comprises a thermoelectric generator (10) with means of the thermal energy heated surfaces (8) and cooled by means of the working medium surfaces (9) such that the working fluid due to the heat assumes a vaporous state.
3. Antriebssystem nach einem der vorstehenden Ansprüche, gekennzeichnet durch eine von dampfförmigem Arbeitsmedium zur Abgabe mechanischer Energie beaufschlagte Expansionseinrichtung (11 ). 3. Drive system according to one of the preceding claims, characterized by a vaporous working medium for delivering mechanical energy acted upon expander (11).
4. Antriebssystem nach einem der vorstehenden Ansprüche, gekennzeichnet durch eine Kondensationseinrichtung (19) zur Kondensation von dampfförmigem Arbeitsmedium nach dessen Durchtritt durch eine Expansionseinrichtung (11 ). 4. Drive system according to one of the preceding claims, characterized by a condensation device (19) for the condensation of vaporous working medium after its passage through an expansion device (11).
5. Antriebssystem nach einem der vorstehenden Ansprüche, gekennzeichnet durch eine das Arbeitsmedium im Kreislauf führende Pumpeneinrichtung (21 ). 5. Drive system according to one of the preceding claims, characterized by a working medium in the circuit leading pump means (21).
6. Antriebssystem nach einem der vorstehenden Ansprüche, dadurch gekenn- zeichnet, dass die Vorrichtung (3) von Abgas der Brennkraftmaschine (5) beheizte erste Flächen (8) und vom Arbeitsmedium gekühlte zweite Flächen (9) mit dazwischen angeordneten thermoelektrischen Schenkelpaaren aufweist und jeweils mindestens einen Einlass (12) und Auslass (14) für Arbeitsmedium besitzt und jeweils mindestens einen Einlass (4) und Auslass (6) für Abgas aufweist. 6. Drive system according to one of the preceding claims, characterized in that the device (3) of exhaust gas of the internal combustion engine (5) heated first surfaces (8) and cooled by the working medium second surfaces (9) with interposed thermoelectric leg pairs and respectively has at least one inlet (12) and outlet (14) for working medium and each having at least one inlet (4) and outlet (6) for exhaust gas.
7. Verfahren zur Nutzung der im Abgas einer Brennkraftmaschine (5) enthaltenen thermischen Energie zur Umwandlung in elektrische und mechanische Energie mittels eines thermoelektrischen Generators (10) und eines Dampf-Rankine- Prozesses, wobei die zur Verdampfung des im Dampfkreisprozess geführten Ar- beitsmediumS' erforderliche Wärmeaufnahme weitgehend isotherm stattfindet und die Wärme der kalten Seite des vom Abgas erwärmten thermoelektrischen Generators (10) entzogen wird. 7. A method for using the thermal energy contained in the exhaust gas of an internal combustion engine (5) for conversion into electrical and mechanical energy by means of a thermoelectric generator (10) and a steam Rankine process, wherein the working medium for vaporization of the steam cycle process' required heat absorption takes place isothermally largely and the heat of the cold side of the heated exhaust gas from the thermoelectric generator (10) is withdrawn.
EP11729262.3A 2010-07-23 2011-07-01 Drive system for a vehicle Withdrawn EP2596224A1 (en)

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DE102010038314A DE102010038314A1 (en) 2010-07-23 2010-07-23 Drive system for a vehicle
PCT/EP2011/003268 WO2012010253A1 (en) 2010-07-23 2011-07-01 Drive system for a vehicle

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WO2012010253A1 (en) 2012-01-26

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