EP2512852A1 - Hybrid motor vehicle having two cooling circuits - Google Patents

Hybrid motor vehicle having two cooling circuits

Info

Publication number
EP2512852A1
EP2512852A1 EP10785026A EP10785026A EP2512852A1 EP 2512852 A1 EP2512852 A1 EP 2512852A1 EP 10785026 A EP10785026 A EP 10785026A EP 10785026 A EP10785026 A EP 10785026A EP 2512852 A1 EP2512852 A1 EP 2512852A1
Authority
EP
European Patent Office
Prior art keywords
temperature
cooling circuit
low
temperature cooling
hybrid drive
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Withdrawn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
EP10785026A
Other languages
German (de)
French (fr)
Inventor
Max Bachmann
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen 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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP2512852A1 publication Critical patent/EP2512852A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
    • B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
    • B60H1/004—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for vehicles having a combustion engine and electric drive means, e.g. hybrid electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B60L1/003—Supplying electric power to auxiliary equipment of vehicles to auxiliary motors, e.g. for pumps, compressors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/003—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to inverters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0061—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electrical machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
    • B60H2001/00307—Component temperature regulation using a liquid flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
    • B60K2001/005—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric storage means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/34—Cabin temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/10—Vehicle control parameters
    • B60L2240/36—Temperature of vehicle components or parts
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Definitions

  • the invention relates to a at least one transmission and a hybrid drive comprehensive motor vehicle according to the preamble of claim 1.
  • the main components of a drive train of a motor vehicle are a drive unit and a transmission.
  • a gearbox converts torques and speeds and thus converts the tractive power of the drive unit.
  • the present invention relates to a motor vehicle whose drive train comprises at least one transmission and a drive unit as a hybrid drive with an internal combustion engine and with an electric machine.
  • FIG. 1 shows a highly schematic block diagram of a motor vehicle having a hybrid drive comprising an internal combustion engine 1 and an electric machine 2, with a transmission 3 and an output 4, wherein between the internal combustion engine 1 and the electric machine 2 of the hybrid drive in the example of FIG a clutch 5 is connected.
  • a clutch 5 In purely electromotive driving the clutch 5 is open and the engine 1 is decoupled from the output 4.
  • the clutch 5 In a hybrid drive, the clutch 5 is closed and the engine 1 is coupled to the output 4. This structure is also called a parallel hybrid.
  • the electric machine 2 of the hybrid drive is assigned an electrical energy store 6. Then, when the electric machine 2 is operated as a generator, the electric energy storage 6 can be charged by means of the electric machine 2. On the other hand, when the electric machine 2 is operated by a motor, the energy stored in the electrical energy store 6 serves to drive the electric machine 2. Power electronics 7 serve to control or regulate the electrical energy store 6 and / or the electric machine 2.
  • the internal combustion engine 1 can be cooled by means of a cooler 8, which is part of a high-temperature cooling circuit 9 shown in dotted lines in FIG. 1.
  • the radiator 8 is associated with a fan 10, by means of which the temperature of the radiator 8 and the internal combustion engine 1 flowing through the cooling medium air can be passed through the radiator 8.
  • the internal combustion engine 1 can be effectively cooled, the cooling of the power electronics, the electrical energy store and / or the electric machine according to need is difficult.
  • thermodynamic primary circuit for cooling an electrical energy storage of a hybrid drive of a motor vehicle
  • thermodynamic secondary circuit wherein a commercial air conditioning provides the thermodynamic primary circuit
  • a cooler which is connected in parallel to the evaporator of the commercial air conditioning system, both in the thermodynamic primary circuit and in the thermodynamic secondary circuit, which is the cooling of the electrical energy storage of the hybrid drive is integrated.
  • the present invention is based on the problem of creating a novel motor vehicle.
  • This problem is solved by a motor vehicle according to claim 1.
  • the energy store of the hybrid drive and the power electronics of the hybrid drive are temperature-dependent cooled via the second radiator and thus the first low-temperature cooling circuit or via the refrigeration system and thus the second low-temperature cooling circuit.
  • the electrical energy storage and optionally the electric machine of a hybrid drive is possible.
  • the electric energy storage of the hybrid drive and the power electronics thereof are preferably switched independently of each other when exceeding different limit temperatures of the coolant flowing through the second radiator for cooling the same via the refrigeration system to the second low-temperature circuit.
  • FIG. 1 shows an exemplary powertrain diagram of a motor vehicle with a hybrid drive according to the prior art.
  • FIG. 2 shows a detail of a motor vehicle according to the invention according to a first embodiment of the invention
  • 3 shows a detail of a motor vehicle according to the invention according to a second embodiment of the invention
  • Fig. 2 shows details of a motor vehicle according to the invention according to a first embodiment of the invention, namely those details which relate to the cooling of the electrical energy storage device 6, the power electronics 7 and optionally the electric machine 2 of the hub drive.
  • the power electronics 7 comprises a not shown in detail to be cooled inverter and a voltage converter to be cooled.
  • the motor vehicle comprises, in addition to the first radiator 8 of the high-temperature cooling circuit 9, a second radiator 11 and a refrigeration system 12, the second radiator 11 being associated with a first low-temperature cooling circuit 13 and the refrigeration system 12 being associated with a second low-temperature cooling circuit 14.
  • the refrigeration system 14 comprises an evaporator 16, a compressor 17, a condenser 18 and an expansion valve 19.
  • the second condenser 11 and the condenser 18 are assigned a common fan 15.
  • the first low-temperature circuit 13 and the second low-temperature circuit 14 are each a pump 20 and 21 and a respective temperature sensor 22 and 23 assigned.
  • coolant can be pumped or conveyed through this first low-temperature cooling circuit 13, the temperature of the coolant flowing through the second cooler 11 being used with the aid of the temperature sensor 22 assigned to the second cooler 11 of the first low-temperature cooling circuit 13 can be detected metrologically.
  • the pump 21 of the second low-temperature cooling circuit 14 is used for the movement of coolant through the second low-temperature cooling circuit 14, wherein by means of the temperature sensor 23, as seen in the flow direction of the second low-temperature cooling circuit 14 coolant is positioned between the evaporator 1 6 and the pump 21, the temperature of the the evaporator 1 6 leaving coolant can be detected metrologically.
  • both the electric energy storage 6 of the hybrid drive and the power electronics 7 of the hybrid drive is temperature-dependent cooled or cooled via the second radiator 1 1 of the first low-temperature cooling circuit 13 or the refrigeration system 14 of the second low-temperature cooling circuit 12, wherein the electrical energy storage 6 of the hybrid drive and the power electronics 7 of the same independently when exceeding different limit temperatures of the second radiator 1 1 flowing coolant for cooling via the refrigeration system 12 to the second low-temperature circuit 14 are switched on.
  • the valve 24 is a 2/2-way valve and the valve 25 is a 3/2-way valve.
  • the pump 21 of the second low-temperature cooling circuit 14 transfers the valve 24 in its second switching position, so then the electrical energy storage 6 of the hybrid drive is decoupled from the first low-temperature cooling circuit 13 and coupled to the second low-temperature cooling circuit 14.
  • the valve 25 remains in its switching position shown in Fig. 1, so that the power electronics 7 remains coupled to the first low-temperature cooling circuit 13.
  • both the electrical energy storage 6 and the power electronics 7 are the second low-temperature cooling circuit 14, so then both the electrical energy storage 6 and the Power electronics 7 are cooled via the refrigeration system 12 of the second low-temperature cooling circuit 14.
  • the control device also transfers the temperature-dependent controlled valve 25 in its second switching position, so that then the power electronics 7 is decoupled from the first low-temperature cooling circuit 13 and coupled to the second low-temperature cooling circuit 14.
  • the control of the two valves 24 and 25 and the pumps 20 and 21 is carried out, as already stated, using the control device, not shown, at least the temperature of the second cooler 1 1 of the first low-temperature cooling circuit 13 by means of the temperature sensor 22 measured temperature supplied by the coolant becomes.
  • the control device not shown, the electric energy storage 6 and the power electronics 7 for cooling the same to the second low-temperature cooling circuit 14, namely successively successively, the energy storage 6 below when a first limit temperature and the power electronics 7 below at a second, higher limit temperature is the second low-temperature cooling circuit 14 is switched. 2
  • the electric machine 2 of the hybrid drive is permanently cooled by the second radiator 11 of the first low-temperature cooling circuit 13.
  • the temperature detected by the temperature sensor 23 of the coolant of the second low-temperature cooling circuit 14 can be used by the control device, not shown, to the Performance of the refrigeration system 12 to regulate.
  • the check valve 26 shown in FIG. 2 it is prevented that coolant can pass from the first low-temperature cooling circuit 13 into the second low-temperature cooling circuit 14 when the two valves 24 and 25 assume the switching position shown in FIG. 2.
  • the valves 24 and 25 assume the position shown in Fig. 2 only when the temperature of the second radiator 1 1 flowing through the coolant of the first low-temperature cooling circuit 13 is smaller than the first limit temperature, in which case the pump 21 is off.
  • the electrical energy storage 6 and the power electronics 7 either the first low-temperature cooling circuit 13 or the second low-temperature cooling circuit 14 switched.
  • a reservoir 27 serves in the first low-temperature cooling circuit 13 to provide additional coolant or the absorption of excess coolant, depending on which switching position the valves 24 and 25 occupy.
  • the second low-temperature cooling circuit 14 may also be associated with such a reservoir. Alternatively, it is possible to manage the absorption of excess coolant and the provision of additional coolant via a corresponding reservoir of the high-temperature cooling circuit.
  • FIG 3 shows a simplified variant of the invention, in which the electric machine 2 of the hybrid drive is cooled neither by the first low-temperature cooling circuit 13 nor by the second low-temperature cooling circuit 14, but rather by the high-temperature cooling circuit 9, via which the internal combustion engine 1 of the hybrid drive is also cooled.
  • a single temperature-dependent actuated valve 28 is present, which, when the temperature of the first low-temperature cooling circuit 13 and the second radiator 1 1 of the same flowing through coolant is less than the first limit temperature, assumes the position shown in Figure 3, wherein then continues the pump 20 of the first low-temperature cooling circuit 13 is turned on and the pump 21 of the second low-temperature cooling circuit 14 is switched on. In this case, then both the electrical energy storage 6 and the power electronics 7 via the second radiator 1 1 and thus the first low-temperature cooling circuit 13 are cooled.
  • the valve 28 is transferred to the second switching position, in which case the pump 21 of the second low-temperature cooling circuit 14 is then turned on , In this case, then the electrical energy storage 6 is decoupled from the first low-temperature cooling circuit 13 and coupled to the second low-temperature cooling circuit 14 so as to be cooled by the refrigeration system 12.
  • the power electronics 7 is then still cooled by the second radiator 1 1 and thus from the first low-temperature cooling circuit 13.
  • both pumps 20, 21 remain switched on and the valve 28 resumes the switching position shown in Fig. 3, in which case both the electrical energy storage. 6 as well as the power electronics 7 are cooled by both the radiator 1 1 and 12 of the refrigeration system.
  • FIGS. 2 and 3 All embodiments of FIGS. 2 and 3 is therefore common that when the temperature of the coolant of the first low-temperature cooling circuit 13, which flows through the second radiator 1 1, is smaller than the first limit temperature, both the electrical energy storage 6 and the Power electronics 7 from the first low-temperature cooling circuit 13 and thus the second cooler 1 1 are cooled. Then, when the temperature of the second radiator 1 1 flowing through coolant is greater than the first limit temperature, however, smaller than the second limit temperature, only the electrical energy storage 6 is the second low-temperature cooling circuit 14 so that the same is then cooled by the refrigeration system 12, whereas the Power electronics 7 is still cooled by the second radiator 1 1.
  • the power electronics 7 are also connected to the second low-temperature cooling circuit 14, so that then both the electrical energy store 6 and the power electronics 7 via the refrigeration system 14 and thus the second Low temperature cooling circuit 14 are cooled.
  • Fig. 4 shows a variant of the embodiments of FIGS. 2 and 3, in which the radiator 1 1 of the second low-temperature cooling circuit 13 and the condenser 18 of the refrigeration system 12 of the second low-temperature cooling circuit 14 separate, individual fans 15 are assigned.
  • the temperature of the low-temperature cooling circuits 13 and 14 to be cooled assemblies of the hybrid drive, so the electric energy storage 6 and / or the power electronics 7 and optionally the electric machine 2, are assigned provide the measured values of the temperature of the coolant flowing through the same of the control device, not shown. It is then possible for the control device to determine, based on the temperatures which the sensors 22, 23 of the low-temperature cooling circuits 13, 14 and the temperature sensors assigned to the assemblies 6, 7, 2 of the hybrid drive, whether one of the pumps 20 and 21 the two low-temperature cooling circuits 13 and 14 is defective.
  • the control device when the pump 20 of the first low-temperature cooling circuit 13 is activated, to check how the temperature of the coolant flowing through the radiator 11 with the aid of the temperature sensor 22 changes to the temperature of the coolant on the electric machine 2 behaves, which is to be cooled by the first low-temperature cooling circuit 13. If it is found that there is a significant difference between these temperatures, it can be concluded that the coolant pump 20 of the first low-temperature cooling circuit 13 is defective. In this case, then, the control device, the coolant pump 21 of the second low-temperature cooling circuit 13 are activated to provide redundancy in the cooling.
  • the functionality of the pump 21 of the second low-temperature cooling circuit 14 can be tested, in which case, for example, when the pump 21 is activated, the temperature measured using the temperature sensor 23 can be compared with a temperature which is measured using a temperature sensor assigned to the electrical energy store 6 is detected.
  • the failure of a pump 20 or 21 can be detected in an analogous manner in order to provide a redundancy of the cooling function.

Abstract

The invention relates to a motor vehicle having a hybrid drive and a transmission which is connected between the hybrid drive and an output, wherein the hybrid drive comprises an internal combustion engine, an electric machine (2), an electrical energy store (6) and power electronics (7). Said vehicle has a high temperature cooling circuit which comprises a first radiator and by means of which the internal combustion engine of the hybrid drive is cooled, and a first low temperature cooling circuit (13) which comprises a second radiator (11), and a second low temperature cooling circuit (14) which comprises a refrigeration system (12), wherein the energy store (6) of the hybrid drive and the power electronics (7) of the hybrid drive are cooled in a temperature-dependent fashion by means of the second radiator (11) and therefore the first low temperature cooling circuit (13) or by means of the refrigeration system (14) and therefore the second low temperature cooling circuit (12).

Description

HYBRID-KRAFTFAHRZEUG MIT ZWEI KÜHLKREISEN  HYBRID MOTOR VEHICLE WITH TWO COOLING CIRCLES
Die Erfindung betrifft ein zumindest ein Getriebe und einen Hybridantrieb umfassendes Kraftfahrzeug nach dem Oberbegriff des Anspruchs 1 . The invention relates to a at least one transmission and a hybrid drive comprehensive motor vehicle according to the preamble of claim 1.
Die Hauptkomponenten eines Antriebsstrangs eines Kraftfahrzeugs sind ein Antriebsaggregat und ein Getriebe. Ein Getriebe wandelt Drehmomente und Drehzahlen und setzt so das Zugkraftangebot des Antriebsaggregats um. Die hier vorliegende Erfindung betrifft ein Kraftfahrzeug, dessen Antriebsstrang zumindest ein Getriebe und als Antriebsaggregat einen Hybridantrieb mit einem Verbrennungsmotor und mit einer elektrischen Maschine umfasst. The main components of a drive train of a motor vehicle are a drive unit and a transmission. A gearbox converts torques and speeds and thus converts the tractive power of the drive unit. The present invention relates to a motor vehicle whose drive train comprises at least one transmission and a drive unit as a hybrid drive with an internal combustion engine and with an electric machine.
Fig. 1 zeigt stark schematisiert ein Blockschaltbild eines Kraftfahrzeugs mit einem einen Verbrennungsmotor 1 und eine elektrische Maschine 2 umfassenden Hybridantrieb, mit einem Getriebe 3 und einem Abtrieb 4, wobei zwischen den Verbrennungsmotor 1 und die elektrische Maschine 2 des Hybridantriebs im Beispiel der Fig. 1 eine Kupplung 5 geschaltet ist. Bei rein elektromotorischer Fahrt ist die Kupplung 5 geöffnet und der Verbrennungsmotor 1 ist vom Abtrieb 4 abgekoppelt. Bei einer Hybridfahrt ist die Kupplung 5 geschlossen und der Verbrennungsmotor 1 ist an den Abtrieb 4 angekoppelt. Diese Struktur wird auch als Parallelhybrid bezeichnet. 1 shows a highly schematic block diagram of a motor vehicle having a hybrid drive comprising an internal combustion engine 1 and an electric machine 2, with a transmission 3 and an output 4, wherein between the internal combustion engine 1 and the electric machine 2 of the hybrid drive in the example of FIG a clutch 5 is connected. In purely electromotive driving the clutch 5 is open and the engine 1 is decoupled from the output 4. In a hybrid drive, the clutch 5 is closed and the engine 1 is coupled to the output 4. This structure is also called a parallel hybrid.
Gemäß Fig. 1 ist der elektrischen Maschine 2 des Hybridantriebs ein elektrischer Energiespeicher 6 zugeordnet. Dann, wenn die elektrische Maschine 2 generatorisch betrieben wird, kann der elektrische Energiespeicher 6 mit Hilfe der elektrischen Maschine 2 geladen werden. Dann hingegen, wenn die elektrische Maschine 2 motorisch betrieben wird, dient die im elektrischen Energiespeicher 6 gespeicherte Energie dem Antreiben der elektrischen Maschine 2. Eine Leistungselektronik 7 dient der Steuerung bzw. Regelung des elektrischen Energiespeichers 6 und/oder der elektrischen Maschine 2. Der Verbrennungsmotor 1 kann mit Hilfe eines Kühlers 8, der Bestandteil eines in Fig. 1 punktiert gezeigten Hochtemperaturkühlkreislaufs 9 ist, gekühlt werden. Hierzu ist dem Kühler 8 ein Lüfter 10 zugeordnet, mit Hilfe dessen zur Temperierung des den Kühler 8 und den Verbrennungsmotor 1 durchströmenden Kühlmediums Luft durch den Kühler 8 geleitet werden kann. According to FIG. 1, the electric machine 2 of the hybrid drive is assigned an electrical energy store 6. Then, when the electric machine 2 is operated as a generator, the electric energy storage 6 can be charged by means of the electric machine 2. On the other hand, when the electric machine 2 is operated by a motor, the energy stored in the electrical energy store 6 serves to drive the electric machine 2. Power electronics 7 serve to control or regulate the electrical energy store 6 and / or the electric machine 2. The internal combustion engine 1 can be cooled by means of a cooler 8, which is part of a high-temperature cooling circuit 9 shown in dotted lines in FIG. 1. For this purpose, the radiator 8 is associated with a fan 10, by means of which the temperature of the radiator 8 and the internal combustion engine 1 flowing through the cooling medium air can be passed through the radiator 8.
Bei dem in Fig. 1 stark schematisiert in Form eines Blockschaltbilds gezeigten Kraftfahrzeug kann zwar der Verbrennungsmotor 1 effektiv gekühlt werden, die bedarfgerechte Kühlung der Leistungselektronik, des elektrischen Energiespeichers und/oder der elektrischen Maschine bereitet jedoch Schwierigkeiten. Although in the motor vehicle shown in highly schematic form in the form of a block diagram in FIG. 1, the internal combustion engine 1 can be effectively cooled, the cooling of the power electronics, the electrical energy store and / or the electric machine according to need is difficult.
Aus der DE 10 2005 048 241 A1 ist ein Zweikreisbatteriekühlsystem zur Kühlung eines elektrischen Energiespeichers eines Hybridantriebs eines Kraftfahrzeugs bekannt. Das dort offenbarte Zweikreisbatteriekühlsystem verfügt über einen thermodynamischen Primärkreislauf und einen thermodynamischen Sekundärkreislauf, wobei eine handelsübliche Klimaanlage den thermodynamischen Primärkreislauf bereitstellt, und wobei ein Kühler, der zum Verdampfer der handelsüblichen Klimaanlage parallel geschaltet ist, sowohl in den thermodynamischen Primärkreislauf als auch in den thermodynamischen Sekundärkreislauf, welcher der Kühlung des elektrischen Energiespeichers des Hybridantriebs dient, integriert ist. Hiermit ist zwar prinzipiell die Kühlung des elektrischen Energiespeichers eines Hybridantriebs möglich, eine bedarfsgerechte Kühlung der Leistungselektronik sowie des elektrischen Energiespeichers und gegebenenfalls der elektrischen Maschine des Hybridantriebs ist jedoch mit diesem aus dem Stand der Technik bekannten Zweikreisbatteriekühlsystem nicht möglich. From DE 10 2005 048 241 A1 a two-circuit battery cooling system for cooling an electrical energy storage of a hybrid drive of a motor vehicle is known. The disclosed there two-circuit battery cooling system has a thermodynamic primary circuit and a thermodynamic secondary circuit, wherein a commercial air conditioning provides the thermodynamic primary circuit, and wherein a cooler, which is connected in parallel to the evaporator of the commercial air conditioning system, both in the thermodynamic primary circuit and in the thermodynamic secondary circuit, which is the cooling of the electrical energy storage of the hybrid drive is integrated. Although this principle, the cooling of the electrical energy storage of a hybrid drive is possible, a need-based cooling of the power electronics and the electrical energy storage and optionally the electric machine of the hybrid drive is not possible with this known from the prior art two-circuit battery cooling system.
Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zu Grunde, ein neuartiges Kraftfahrzeug zu schaffen. Dieses Problem wird durch ein Kraftfahrzeug gemäß Anspruch 1 gelöst. Erfindungsgemäß sind der Energiespeicher des Hybridantriebs und die Leistungselektronik des Hybridantriebs temperaturabhängig über den zweiten Kühler und damit den ersten Niedertemperaturkühlkreislauf oder über die Kälteanlage und damit den zweiten Niedertemperaturkühlkreislauf gekühlt. On this basis, the present invention is based on the problem of creating a novel motor vehicle. This problem is solved by a motor vehicle according to claim 1. According to the invention, the energy store of the hybrid drive and the power electronics of the hybrid drive are temperature-dependent cooled via the second radiator and thus the first low-temperature cooling circuit or via the refrigeration system and thus the second low-temperature cooling circuit.
Mit der hier vorliegenden Erfindung wird eine völlig neuartige, effektive und bedarfsgerechte Kühlung der Leistungselektronik, des elektrischen Energiespeichers und gegebenenfalls der elektrischen Maschine eines Hybridantriebs ermöglicht. Abhängig von der Temperatur kann sowohl der elektrische Energiespeicher des Hybridantriebs als auch die Leistungselektronik desselben über den zweiten Kühler des ersten Niedertemperaturkühlkreislaufs oder die Kälteanlage des zweiten Niedertemperaturkühlkreislaufs gekühlt werden. Dabei werden vorzugsweise der elektrische Energiespeicher des Hybridantriebs sowie die Leistungselektronik desselben unabhängig voneinander bei Überschreiten unterschiedlicher Grenztemperaturen des den zweiten Kühler durchströmenden Kühlmittels zur Kühlung derselben über die Kälteanlage dem zweiten Niedertemperaturkreislauf aufgeschaltet. Hierdurch kann unterschiedlichen Kühlanforderungen des elektrischen Energiespeichers sowie der Leistungselektronik Rechnung getragen und eine bedarfsgerechte Kühlung gewährleistet werden. With the present invention, a completely new, effective and needs-based cooling of the power electronics, the electrical energy storage and optionally the electric machine of a hybrid drive is possible. Depending on the temperature of both the electrical energy storage of the hybrid drive and the power electronics of the same via the second cooler of the first low-temperature cooling circuit or the refrigeration system of the second low-temperature cooling circuit can be cooled. In this case, the electric energy storage of the hybrid drive and the power electronics thereof are preferably switched independently of each other when exceeding different limit temperatures of the coolant flowing through the second radiator for cooling the same via the refrigeration system to the second low-temperature circuit. As a result, different cooling requirements of the electrical energy storage and the power electronics are taken into account and a need-based cooling guaranteed.
Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt: Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Fig. 1 ein beispielhaftes Antriebsstrangsschema eines Kraftfahrzeugs mit einem Hybridantrieb nach dem Stand der Technik; 1 shows an exemplary powertrain diagram of a motor vehicle with a hybrid drive according to the prior art.
Fig. 2 ein Detail eines erfindungsgemäßen Kraftfahrzeugs nach einem ersten Ausführungsbeispiel der Erfindung; Fig. 3 ein Detail eines erfindungsgemäßen Kraftfahrzeugs nach einem zweiten Ausführungsbeispiel der Erfindung; und 2 shows a detail of a motor vehicle according to the invention according to a first embodiment of the invention; 3 shows a detail of a motor vehicle according to the invention according to a second embodiment of the invention; and
Fig. 4 eine Alternative für die Details der Fig. 2 und 3.  4 shows an alternative to the details of FIGS. 2 and 3.
Fig. 2 zeigt Details eines erfindungsgemäßen Kraftfahrzeugs nach einem ersten Ausführungsbeispiel der Erfindung, nämlich solche Details, welche die Kühlung des elektrischen Energiespeichers 6, der Leistungselektronik 7 und gegebenenfalls der elektrischen Maschine 2 des Hybrisantriebs betreffen. Die Leistungselektronik 7 umfasst einen im Detail nicht gezeigten zu kühlenden Wechselrichter sowie einen zu kühlenden Spannungswandler. Fig. 2 shows details of a motor vehicle according to the invention according to a first embodiment of the invention, namely those details which relate to the cooling of the electrical energy storage device 6, the power electronics 7 and optionally the electric machine 2 of the hub drive. The power electronics 7 comprises a not shown in detail to be cooled inverter and a voltage converter to be cooled.
Das erfindungsgemäße Kraftfahrzeug umfasst zusätzlich zum ersten Kühler 8 des Hochtemperaturkühlkreislaufs 9 einen zweiten Kühler 1 1 sowie eine Kälteanlage 12, wobei der zweite Kühler 1 1 einem ersten Niedertempera- turkühlkreislauf 13 und die Kälteanlage 12 einem zweiten Niedertemperatur- kühlkreislauf 14 zugeordnet ist. Die Kälteanlage 14 umfasst einen Verdampfer 1 6, einen Kompressor 17, einen Kondensator 18 und ein Expansionsventil 19. Dem zweite Kühler 1 1 und dem Kondensator 18 sind ein gemeinsamer Lüfter 15 zugeordnet. The motor vehicle according to the invention comprises, in addition to the first radiator 8 of the high-temperature cooling circuit 9, a second radiator 11 and a refrigeration system 12, the second radiator 11 being associated with a first low-temperature cooling circuit 13 and the refrigeration system 12 being associated with a second low-temperature cooling circuit 14. The refrigeration system 14 comprises an evaporator 16, a compressor 17, a condenser 18 and an expansion valve 19. The second condenser 11 and the condenser 18 are assigned a common fan 15.
Dem ersten Niedertemperaturkreislauf 13 sowie dem zweiten Niedertemperaturkreislauf 14 sind jeweils eine Pumpe 20 bzw. 21 und jeweils ein Temperatursensor 22 bzw. 23 zugeordnet. The first low-temperature circuit 13 and the second low-temperature circuit 14 are each a pump 20 and 21 and a respective temperature sensor 22 and 23 assigned.
Mithilfe der Pumpe 20 des ersten Niedertemperaturkühlkreislaufs 13 kann Kühlmittel durch diesen ersten Niedertemperaturkühlkreislauf 13 gepumpt bzw. gefördert werden, wobei mithilfe des Temperatursensors 22, der dem zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 zugeordnet ist, die Temperatur des den zweiten Kühler 1 1 durchströmenden Kühlmittels messtechnisch erfasst werden kann. Die Pumpe 21 des zweiten Niedertemperaturkühlkreislaufs 14 dient der Bewegung von Kühlmittel durch den zweiten Niedertemperaturkühlkreislauf 14, wobei mithilfe des Temperatursensors 23, der in Strömungsrichtung des den zweiten Niedertemperaturkühlkreislauf 14 durchströmenden Kühlmittels gesehen zwischen dem Verdampfer 1 6 und der Pumpe 21 positioniert ist, die Temperatur des den Verdampfer 1 6 verlassenden Kühlmittels messtechnisch er- fasst werden kann. With the aid of the pump 20 of the first low-temperature cooling circuit 13, coolant can be pumped or conveyed through this first low-temperature cooling circuit 13, the temperature of the coolant flowing through the second cooler 11 being used with the aid of the temperature sensor 22 assigned to the second cooler 11 of the first low-temperature cooling circuit 13 can be detected metrologically. The pump 21 of the second low-temperature cooling circuit 14 is used for the movement of coolant through the second low-temperature cooling circuit 14, wherein by means of the temperature sensor 23, as seen in the flow direction of the second low-temperature cooling circuit 14 coolant is positioned between the evaporator 1 6 and the pump 21, the temperature of the the evaporator 1 6 leaving coolant can be detected metrologically.
Im Sinne der hier vorliegenden Erfindung ist sowohl der elektrische Energiespeicher 6 des Hybridantriebs als auch die Leistungselektronik 7 des Hybridantriebs temperaturabhängig über den zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 oder über die Kälteanlage 14 des zweiten Niedertemperaturkühlkreislaufs 12 gekühlt bzw. kühlbar, wobei der elektrische Energiespeicher 6 des Hybridantriebs und die Leistungselektronik 7 desselben unabhängig voneinander bei Überschreiten unterschiedlicher Grenztemperaturen des den zweiten Kühler 1 1 durchströmenden Kühlmittels zur Kühlung über die Kälteanlage 12 dem zweiten Niedertemperaturkreislauf 14 aufgeschaltet sind. For the purposes of the present invention, both the electric energy storage 6 of the hybrid drive and the power electronics 7 of the hybrid drive is temperature-dependent cooled or cooled via the second radiator 1 1 of the first low-temperature cooling circuit 13 or the refrigeration system 14 of the second low-temperature cooling circuit 12, wherein the electrical energy storage 6 of the hybrid drive and the power electronics 7 of the same independently when exceeding different limit temperatures of the second radiator 1 1 flowing coolant for cooling via the refrigeration system 12 to the second low-temperature circuit 14 are switched on.
Unterhalb einer ersten Grenztemperatur des den zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 durchströmenden Kühlmittels, zum Beispiel unterhalb von 25 °C dieses Kühlmittels, sind sowohl der elektrische Energiespeicher 6 des Hybridantriebs als auch die Leistungselektronik 7 desselben jeweils über den zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 gekühlt, wozu die Pumpe 20 des ersten Niedertemperaturkühlkreislaufs 13 läuft, die Pumpe 21 des zweiten Niedertemperaturkühlkreislaufs 14 stillsteht, und die beiden in Fig. 2 gezeigten, temperaturabhängig angesteuerten Ventile 24 und 25, die in Fig. 2 gezeigte Position bzw. Schaltstellung einnehmen. Beim Ventil 24 handelt es sich um ein 2/2-Wegeventil und beim Ventil 25 um ein 3/2-Wegeventil. Dann, wenn die Temperatur des den zweiten Kühler 1 1 des ersten Nie- dertemperaturkühlkreislaufs 13 durchströmenden Kühlmittels die erste Grenztemperatur überschreitet, jedoch kleiner als eine zweite Grenztemperatur ist, zum Beispiel kleiner als 50 °C, ist der elektrische Energiespeicher 6 des Hybridantriebs über die Kälteanlage 12 des zweiten Niedertemperaturkühlkreislaufs 14 gekühlt, wohingegen die Leistungselektronik 7 weiterhin über den zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 gekühlt ist. Hierzu schaltet dann abhängig von der Temperatur des den zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 durchströmenden Kühlmittels, die vom Sensor 22 erfasst wird, eine nicht gezeigte Steuerungseinrichtung die Pumpe 21 des zweiten Niedertemperaturkühlkreislaufs 14 ein und überführt das Ventil 24 in seine zweite Schaltstellung, sodass dann der elektrische Energiespeicher 6 des Hybridantriebs vom ersten Niedertemperaturkühlkreislauf 13 abgekoppelt und an den zweiten Niedertemperaturkühlkreislauf 14 angekoppelt ist. Das Ventil 25 verbleibt in seiner in Fig. 1 gezeigten Schaltstellung, sodass die Leistungselektronik 7 an den ersten Niedertemperaturkühlkreislauf 13 angekoppelt bleibt. Below a first limit temperature of the second radiator 1 1 of the first low-temperature cooling circuit 13 flowing through the coolant, for example, below 25 ° C this coolant, both the electric energy storage 6 of the hybrid drive and the power electronics 7 thereof via the second radiator 1 1 of the first Cooled low-temperature cooling circuit 13, including the pump 20 of the first low-temperature cooling circuit 13 is running, the pump 21 of the second low-temperature cooling circuit 14 is stationary, and the two shown in Fig. 2, temperature-controlled valves 24 and 25, occupy the position shown in Fig. 2 or switching position , The valve 24 is a 2/2-way valve and the valve 25 is a 3/2-way valve. Then, when the temperature of the second radiator 1 1 of the first low-temperature cooling circuit 13 flowing through the coolant exceeds the first limit temperature, but less than a second limit temperature, for example, less than 50 ° C, the electrical energy storage device 6 of the hybrid drive via the refrigeration system 12 of the second low-temperature cooling circuit 14 cooled, whereas the power electronics 7 is further cooled by the second radiator 1 1 of the first low-temperature cooling circuit 13. For this purpose, then, depending on the temperature of the second radiator 1 1 of the first low-temperature cooling circuit 13 flowing through the coolant, which is detected by the sensor 22, a control device, not shown, the pump 21 of the second low-temperature cooling circuit 14 and transfers the valve 24 in its second switching position, so then the electrical energy storage 6 of the hybrid drive is decoupled from the first low-temperature cooling circuit 13 and coupled to the second low-temperature cooling circuit 14. The valve 25 remains in its switching position shown in Fig. 1, so that the power electronics 7 remains coupled to the first low-temperature cooling circuit 13.
Dann, wenn die Temperatur des den zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 durchströmenden Kühlmittels auch die zweite Grenztemperatur überschreitet, sind sowohl der elektrische Energiespeicher 6 als auch die Leistungselektronik 7 dem zweiten Niedertemperaturkühlkreislauf 14 aufgeschaltet, sodass dann sowohl der elektrische Energiespeicher 6 als auch die Leistungselektronik 7 über die Kälteanlage 12 des zweiten Niedertemperaturkühlkreislaufs 14 gekühlt sind. Hierzu überführt dann die nicht gezeigte Steuerungseinrichtung auch das temperaturabhängig gesteuerte Ventil 25 in seine zweite Schaltposition, sodass dann auch die Leistungselektronik 7 vom ersten Niedertemperaturkühlkreislauf 13 abgekoppelt und an den zweiten Niedertemperaturkühlkreislauf 14 angekoppelt ist. Die Ansteuerung der beiden Ventile 24 und 25 sowie der Pumpen 20 und 21 erfolgt, wie bereits ausgeführt, mithilfe der nicht gezeigten Steuerungseinrichtung, der als Eingangsgröße zumindest die mithilfe des Temperatursensors 22 gemessene Temperatur des den zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislauf 13 durchströmenden Kühlmittels zugeführt wird. Abhängig von dieser Temperatur schaltet die nicht gezeigte Steuerungseinrichtung den elektrischen Energiespeicher 6 sowie die Leistungselektronik 7 zur Kühlung derselben dem zweiten Niedertemperaturkühlkreislauf 14 auf, nämlich sukzessive nacheinander, wobei der Energiespeicher 6 zuerst bei Überschreiten einer ersten Grenztemperatur und die Leistungselektronik 7 nachfolgend bei Überschreiten einer zweiten, höheren Grenztemperatur dem zweiten Niedertemperaturkühlkreislauf 14 aufgeschaltet wird. Wie Fig. 2 entnommen werden kann, ist die elektrische Maschine 2 des Hybridantriebs permanent vom zweiten Kühler 1 1 des ersten Niedertemperaturkühlkreislaufs 13 gekühlt. Then, when the temperature of the second radiator 1 1 of the first low-temperature cooling circuit 13 flowing through the coolant also exceeds the second limit temperature, both the electrical energy storage 6 and the power electronics 7 are the second low-temperature cooling circuit 14, so then both the electrical energy storage 6 and the Power electronics 7 are cooled via the refrigeration system 12 of the second low-temperature cooling circuit 14. For this purpose, then the control device, not shown, also transfers the temperature-dependent controlled valve 25 in its second switching position, so that then the power electronics 7 is decoupled from the first low-temperature cooling circuit 13 and coupled to the second low-temperature cooling circuit 14. The control of the two valves 24 and 25 and the pumps 20 and 21 is carried out, as already stated, using the control device, not shown, at least the temperature of the second cooler 1 1 of the first low-temperature cooling circuit 13 by means of the temperature sensor 22 measured temperature supplied by the coolant becomes. Depending on this temperature, the control device, not shown, the electric energy storage 6 and the power electronics 7 for cooling the same to the second low-temperature cooling circuit 14, namely successively successively, the energy storage 6 below when a first limit temperature and the power electronics 7 below at a second, higher limit temperature is the second low-temperature cooling circuit 14 is switched. 2, the electric machine 2 of the hybrid drive is permanently cooled by the second radiator 11 of the first low-temperature cooling circuit 13.
Dann, wenn der Energiespeicher 6 und gegebenenfalls die Leistungselektronik 7 des Hybridantriebs dem zweiten Niedertemperaturkühlkreislauf 14 zur Kühlung derselben über die Kälteanlage 12 aufgeschaltet sind, kann die vom Temperatursensor 23 erfasste Temperatur des Kühlmittels des zweiten Niedertemperaturkühlkreislaufs 14 von der nicht gezeigten Steuerungseinrichtung verwendet werden, um die Leistung der Kälteanlage 12 zu regeln. Then, when the energy storage 6 and optionally the power electronics 7 of the hybrid drive the second low-temperature cooling circuit 14 are switched to the same cooling via the refrigeration system 12, the temperature detected by the temperature sensor 23 of the coolant of the second low-temperature cooling circuit 14 can be used by the control device, not shown, to the Performance of the refrigeration system 12 to regulate.
Über das in Fig. 2 gezeigte Rückschlagventil 26 wird verhindert, dass dann, wenn die beiden Ventile 24 und 25, die in Fig. 2 gezeigte Schaltstellung einnehmen, Kühlmittel vom ersten Niedertemperaturkühlkreislauf 13 in den zweiten Niedertemperaturkühlkreislauf 14 gelangen kann. Wie bereits erwähnt, nehmen die Ventile 24 und 25 die in Fig. 2 gezeigte Position nur dann ein, wenn die Temperatur des den zweiten Kühler 1 1 durchströmenden Kühlmittels des ersten Niedertemperaturkühlkreislaufs 13 kleiner als die erste Grenztemperatur ist, wobei dann in diesem Fall die Pumpe 21 ausgeschaltet ist. Abhängig davon, welche Schaltstellung die Ventil 24 und 25 einnehmen, sind, wie bereits ausgeführt, der elektrische Energiespeicher 6 sowie die Leistungselektronik 7 entweder dem ersten Niedertemperaturkühlkreislauf 13 oder dem zweiten Niedertemperaturkühlkreislauf 14 aufgeschaltet. Ein Vorratsbehälter 27 dient dabei im ersten Niedertemperaturkühlkreislauf 13 der Bereitstellung von zusätzlichem Kühlmittel oder der Aufnahme von überschüssigem Kühlmittel, abhängig davon, welche Schaltstellung die Ventile 24 und 25 einnehmen. Im zweiten Niedertemperaturkühlkreislauf 14 kann ebenfalls ein solcher Vorratsbehälter zugeordnet sein. Alternativ ist es möglich, die Aufnahme von überschüssigem Kühlmittel sowie die Bereitstellung von zusätzlichem Kühlmittel über einen entsprechenden Vorratsbehälter des Hochtemperaturkühlkreislaufs zu bewerkstelligen. By means of the check valve 26 shown in FIG. 2, it is prevented that coolant can pass from the first low-temperature cooling circuit 13 into the second low-temperature cooling circuit 14 when the two valves 24 and 25 assume the switching position shown in FIG. 2. As already mentioned, the valves 24 and 25 assume the position shown in Fig. 2 only when the temperature of the second radiator 1 1 flowing through the coolant of the first low-temperature cooling circuit 13 is smaller than the first limit temperature, in which case the pump 21 is off. Depending on which switching position the valve 24 and 25 occupy, are, as already stated, the electrical energy storage 6 and the power electronics 7 either the first low-temperature cooling circuit 13 or the second low-temperature cooling circuit 14 switched. A reservoir 27 serves in the first low-temperature cooling circuit 13 to provide additional coolant or the absorption of excess coolant, depending on which switching position the valves 24 and 25 occupy. In the second low-temperature cooling circuit 14 may also be associated with such a reservoir. Alternatively, it is possible to manage the absorption of excess coolant and the provision of additional coolant via a corresponding reservoir of the high-temperature cooling circuit.
Fig. 3 zeigt eine vereinfachte Variante der Erfindung, in welcher die elektrische Maschine 2 des Hybridantriebs weder vom ersten Niedertemperaturkühlkreislauf 13 noch vom zweiten Niedertemperaturkühlkreislauf 14 gekühlt wird, sondern vielmehr vom Hochtemperaturkühlkreislauf 9, über welchen auch der Verbrennungsmotor 1 des Hybridantriebs gekühlt wird. 3 shows a simplified variant of the invention, in which the electric machine 2 of the hybrid drive is cooled neither by the first low-temperature cooling circuit 13 nor by the second low-temperature cooling circuit 14, but rather by the high-temperature cooling circuit 9, via which the internal combustion engine 1 of the hybrid drive is also cooled.
In diesem Fall ist dann ein einziges temperaturabhängig angesteuertes Ventil 28 vorhanden, welches dann, wenn die Temperatur des den ersten Niedertemperaturkühlkreislauf 13 bzw. den zweiten Kühler 1 1 desselben durchströmenden Kühlmittels kleiner als die erste Grenztemperatur ist, die in Fig. 3 gezeigte Position einnimmt, wobei dann weiterhin die Pumpe 20 des ersten Niedertemperaturkühlkreislaufs 13 eingeschaltet und die Pumpe 21 des zweiten Niedertemperaturkühlkreislaufs 14 aufgeschaltet ist. In diesem Fall sind dann sowohl der elektrische Energiespeicher 6 als auch die Leistungselektronik 7 über den zweiten Kühler 1 1 und damit den ersten Niedertemperaturkühlkreislauf 13 gekühlt. Dann, wenn die Temperatur des den zweiten Kühler 1 1 durchströmenden Kühlmittels die erste Grenztemperatur überschreitet, jedoch kleiner als die zweite Grenztemperatur ist, wird das Ventil 28 in die zweite Schaltstellung überführt, wobei dann weiterhin die Pumpe 21 des zweiten Niedertemperaturkühl- kreislaufs 14 eingeschaltet wird. In diesem Fall ist dann der elektrische Energiespeicher 6 vom ersten Niedertemperaturkühlkreislauf 13 abgekoppelt und an den zweiten Niedertemperaturkühlkreislauf 14 angekoppelt, um so von der Kälteanlage 12 gekühlt zu sein. Die Leistungselektronik 7 ist dann weiterhin vom zweiten Kühler 1 1 und damit vom ersten Niedertemperaturkühlkreislauf 13 gekühlt. In this case, then a single temperature-dependent actuated valve 28 is present, which, when the temperature of the first low-temperature cooling circuit 13 and the second radiator 1 1 of the same flowing through coolant is less than the first limit temperature, assumes the position shown in Figure 3, wherein then continues the pump 20 of the first low-temperature cooling circuit 13 is turned on and the pump 21 of the second low-temperature cooling circuit 14 is switched on. In this case, then both the electrical energy storage 6 and the power electronics 7 via the second radiator 1 1 and thus the first low-temperature cooling circuit 13 are cooled. Then, when the temperature of the second radiator 1 1 flowing through the coolant exceeds the first limit temperature, but is smaller than the second limit temperature, the valve 28 is transferred to the second switching position, in which case the pump 21 of the second low-temperature cooling circuit 14 is then turned on , In this case, then the electrical energy storage 6 is decoupled from the first low-temperature cooling circuit 13 and coupled to the second low-temperature cooling circuit 14 so as to be cooled by the refrigeration system 12. The power electronics 7 is then still cooled by the second radiator 1 1 and thus from the first low-temperature cooling circuit 13.
Dann, wenn die Temperatur des den zweiten Kühler 1 1 durchströmenden Kühlmittels auch größer als die zweite Grenztemperatur ist, bleiben beiden Pumpen 20, 21 eingeschaltet und das Ventil 28 nimmt wieder die in Fig. 3 gezeigte Schaltstellung ein, wobei dann sowohl der elektrische Energiespeicher 6 als auch die Leistungselektronik 7 sowohl vom Kühler 1 1 als auch von der Kälteanlage 12 gekühlt sind. Then, when the temperature of the second radiator 1 1 flowing through coolant is also greater than the second limit temperature, both pumps 20, 21 remain switched on and the valve 28 resumes the switching position shown in Fig. 3, in which case both the electrical energy storage. 6 as well as the power electronics 7 are cooled by both the radiator 1 1 and 12 of the refrigeration system.
Allen Ausführungsbeispielen der Fig. 2 und 3 ist demnach gemeinsam, dass dann, wenn die Temperatur des Kühlmittels des ersten Niedertemperatur- kühlkreislaufs 13, welches den zweiten Kühler 1 1 durchströmt, kleiner als die erste Grenztemperatur ist, sowohl der elektrische Energiespeicher 6 als auch die Leistungselektronik 7 vom ersten Niedertemperaturkühlkreislauf 13 und damit vom zweiten Kühler 1 1 gekühlt sind. Dann, wenn die Temperatur des den zweiten Kühler 1 1 durchströmenden Kühlmittels größer als die erste Grenztemperatur jedoch kleiner als die zweite Grenztemperatur ist, ist ausschließlich der elektrische Energiespeicher 6 dem zweiten Niedertemperaturkühlkreislauf 14 aufgeschaltet, sodass derselbe dann von der Kälteanlage 12 gekühlt ist, wohingegen die Leistungselektronik 7 weiterhin vom zweiten Kühler 1 1 gekühlt ist. Überschreitet die Temperatur des den zweiten Kühler 1 1 durchströmenden Kühlmittels auch die zweite Grenztemperatur, so ist nachfolgend auch die Leistungselektronik 7 dem zweiten Niedertemperaturkühlkreislauf 14 aufgeschaltet, sodass dann sowohl der elektrische Energiespeicher 6 als auch die Leistungselektronik 7 über die Kälteanlage 14 und damit über den zweiten Niedertemperaturkühlkreislauf 14 gekühlt sind. All embodiments of FIGS. 2 and 3 is therefore common that when the temperature of the coolant of the first low-temperature cooling circuit 13, which flows through the second radiator 1 1, is smaller than the first limit temperature, both the electrical energy storage 6 and the Power electronics 7 from the first low-temperature cooling circuit 13 and thus the second cooler 1 1 are cooled. Then, when the temperature of the second radiator 1 1 flowing through coolant is greater than the first limit temperature, however, smaller than the second limit temperature, only the electrical energy storage 6 is the second low-temperature cooling circuit 14 so that the same is then cooled by the refrigeration system 12, whereas the Power electronics 7 is still cooled by the second radiator 1 1. If the temperature of the coolant flowing through the second cooler 1 1 also exceeds the second limit temperature, then the power electronics 7 are also connected to the second low-temperature cooling circuit 14, so that then both the electrical energy store 6 and the power electronics 7 via the refrigeration system 14 and thus the second Low temperature cooling circuit 14 are cooled.
Fig. 4 zeigt eine Variante zu den Ausführungsbeispielen der Fig. 2 und 3, in welcher dem Kühler 1 1 des zweiten Niedertemperaturkühlkreislaufs 13 sowie dem Kondensator 18 der Kälteanlage 12 des zweiten Niedertemperaturkühlkreislaufs 14 separate, individuelle Lüfter 15 zugeordnet sind. Fig. 4 shows a variant of the embodiments of FIGS. 2 and 3, in which the radiator 1 1 of the second low-temperature cooling circuit 13 and the condenser 18 of the refrigeration system 12 of the second low-temperature cooling circuit 14 separate, individual fans 15 are assigned.
Nach einer vorteilhaften Weiterbildung der hier vorliegenden Erfindung ist es möglich, dass auch den über die Niedertemperaturkühlkreisläufe 13 bzw. 14 zu kühlenden Baugruppen des Hybridantriebs, also dem elektrischen Energiespeicher 6 und/oder der Leistungselektronik 7 und gegebenenfalls der elektrischen Maschine 2, Temperatursensoren zugeordnet sind, die Messwerte über die Temperatur des dieselben durchströmenden Kühlmittels der nicht gezeigten Steuerungseinrichtung bereitstellen. Dabei ist es dann möglich, dass die Steuerungseinrichtung auf Grundlage der Temperaturen, welche die Sensoren 22, 23 der Niedertemperaturkühlkreisläufe 13, 14 und die den Baugruppen 6, 7, 2 des Hybridantriebs zugeordneten Temperatursensoren bereitstellen, ermittelt, ob eine der Pumpen 20 bzw. 21 der beiden Niedertemperaturkühlkreisläufe 13 bzw. 14 defekt ist. According to an advantageous development of the present invention, it is possible that the temperature of the low-temperature cooling circuits 13 and 14 to be cooled assemblies of the hybrid drive, so the electric energy storage 6 and / or the power electronics 7 and optionally the electric machine 2, are assigned provide the measured values of the temperature of the coolant flowing through the same of the control device, not shown. It is then possible for the control device to determine, based on the temperatures which the sensors 22, 23 of the low-temperature cooling circuits 13, 14 and the temperature sensors assigned to the assemblies 6, 7, 2 of the hybrid drive, whether one of the pumps 20 and 21 the two low-temperature cooling circuits 13 and 14 is defective.
So ist es zum Beispiel im Ausführungsbeispiel der Fig. 2 möglich, dass die Steuerungseinrichtung bei aktivierter Pumpe 20 des ersten Niedertemperaturkühlkreislaufs 13 überprüft, wie sich die mithilfe des Temperatursensors 22 erfasste Temperatur des den Kühler 1 1 durchströmenden Kühlmittels zur Temperatur des Kühlmittels an der elektrischen Maschine 2 verhält, die vom ersten Niedertemperaturkühlkreislauf 13 gekühlt werden soll. Wird hierbei festgestellt, dass zwischen diesen Temperaturen eine deutliche Abweichung besteht, so kann darauf geschlossen werden, dass die Kühlmittelpumpe 20 des ersten Niedertemperaturkühlkreislaufs 13 defekt ist. In diesem Fall kann dann von der Steuerungseinrichtung die Kühlmittelpumpe 21 des zweiten Niedertemperaturkühlkreislaufs 13 aktiviert werden, um eine Redundanz in der Kühlung bereitzustellen. For example, in the exemplary embodiment of FIG. 2, it is possible for the control device, when the pump 20 of the first low-temperature cooling circuit 13 is activated, to check how the temperature of the coolant flowing through the radiator 11 with the aid of the temperature sensor 22 changes to the temperature of the coolant on the electric machine 2 behaves, which is to be cooled by the first low-temperature cooling circuit 13. If it is found that there is a significant difference between these temperatures, it can be concluded that the coolant pump 20 of the first low-temperature cooling circuit 13 is defective. In this case, then, the control device, the coolant pump 21 of the second low-temperature cooling circuit 13 are activated to provide redundancy in the cooling.
Auf analoge Art und Weise kann auch die Funktionsfähigkeit der Pumpe 21 des zweiten Niedertemperaturkühlkreislaufs 14 geprüft werden, wobei dann zum Beispiel bei aktivierter Pumpe 21 die mithilfe des Temperatursensors 23 gemessene Temperatur mit einer Temperatur verglichen werden kann, die mithilfe eines dem elektrischen Energiespeicher 6 zugeordneten Temperatursensors erfasst wird. In an analogous manner, the functionality of the pump 21 of the second low-temperature cooling circuit 14 can be tested, in which case, for example, when the pump 21 is activated, the temperature measured using the temperature sensor 23 can be compared with a temperature which is measured using a temperature sensor assigned to the electrical energy store 6 is detected.
Im Ausführungsbeispiel der Fig. 3 kann auf analoge Art und Weise der Ausfall einer Pumpe 20 bzw. 21 detektiert werden, um eine Redundanz der Kühlfunktion bereitzustellen. In the embodiment of FIG. 3, the failure of a pump 20 or 21 can be detected in an analogous manner in order to provide a redundancy of the cooling function.
Bezuqszeichen REFERENCE CHARACTERS
Verbrennungsmotor internal combustion engine
Elektromotor  electric motor
Getriebe  transmission
Abtrieb  output
Kupplung  clutch
Energiespeicher  energy storage
Leistungselektronik  power electronics
erster Kühler first cooler
Hochtemperaturkühlkreislauf  High-temperature cooling circuit
Lüfter  Fan
erster Niedertemperaturkühlkreislauf zweiter Niedertemperaturkühlkreislauf zweiter Kühler first low-temperature cooling circuit second low-temperature cooling circuit second radiator
Kälteanlage  refrigeration plant
Lüfter  Fan
Verdampfer  Evaporator
Kompressor  compressor
Kondensator  capacitor
Expansionsventil  expansion valve
Pumpe  pump
Pumpe  pump
Temperatursensor  temperature sensor
Temperatursensor  temperature sensor
Ventil  Valve
Ventil  Valve
Rückschlagventil  check valve
Vorratsbehälter  reservoir
Ventil  Valve

Claims

Patentansprüche claims
1 . Kraftfahrzeug, mit einem Hybridantrieb und mit einem zwischen den Hybridantrieb und einen Abtrieb geschalteten Getriebe, wobei der Hybridantrieb einen Verbrennungsmotor (1 ), eine elektrische Maschine (2), einen elektrischen Energiespeicher (6) und eine Leistungselektronik (7) umfasst, mit einem einen ersten Kühler (8) umfassenden Hochtemperaturkühlkreislauf (9), über den der Verbrennungsmotor (1 ) des Hybridantriebs gekühlt ist, mit einem einen zweiten Kühler (1 1 ) umfassenden ersten Niedertemperaturkühlkreislauf (13) und einem eine Kälteanlage (12) umfassenden zweiten Niedertemperaturkühlkreislauf (14), dadurch gekennzeichnet, dass sowohl der Energiespeicher (6) des Hybridantriebs als auch die Leistungselektronik (7) des Hybridantriebs temperaturabhängig über den zweiten Kühler (1 1 ) und damit den ersten Niedertemperaturkühlkreislauf (13) oder über die Kälteanlage (14) und damit den zweiten Niedertemperaturkühlkreislauf (12) gekühlt ist. 1 . Motor vehicle, with a hybrid drive and with a switched between the hybrid drive and an output gearbox, wherein the hybrid drive comprises an internal combustion engine (1), an electric machine (2), an electrical energy store (6) and power electronics (7), with a one first cooler (8) comprising high-temperature cooling circuit (9), via which the internal combustion engine (1) of the hybrid drive is cooled, comprising a second cooler (1 1) comprising the first low-temperature cooling circuit (13) and a refrigeration system (12) comprising a second low-temperature cooling circuit (14 ), characterized in that both the energy storage (6) of the hybrid drive and the power electronics (7) of the hybrid drive temperature dependent on the second radiator (1 1) and thus the first low-temperature cooling circuit (13) or via the refrigeration system (14) and thus the second low-temperature cooling circuit (12) is cooled.
2. Kraftfahrzeug nach Anspruch 1 , dadurch gekennzeichnet, dass der Energiespeicher (6) des Hybridantriebs und die Leistungselektronik (7) des Hybridantriebs unabhängig voneinander bei Überschreiten unterschiedlicher Grenztemperaturen des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels zur Kühlung derselben über die Kälteanlage (12) dem zweiten Niedertemperaturkühlkreislauf (14) aufgeschaltet sind. 2. Motor vehicle according to claim 1, characterized in that the energy store (6) of the hybrid drive and the power electronics (7) of the hybrid drive independently when exceeding different limit temperatures of the second radiator (1 1) flowing through coolant for cooling the same over the refrigeration system (12 ) are connected to the second low-temperature cooling circuit (14).
3. Kraftfahrzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass unterhalb einer ersten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels sowohl der Energiespeicher (6) des Hybridantriebs als auch die Leistungselektronik (7) des Hybridantriebs jeweils über den zweiten Kühler (1 1 ) und damit den ersten Niedertemperaturkühlkreislauf (13) gekühlt sind. 3. Motor vehicle according to claim 1 or 2, characterized in that below a first temperature limit of the second radiator (1 1) flowing through the coolant both the energy storage (6) of the hybrid drive and the power electronics (7) of the hybrid drive in each case via the second radiator ( 1 1) and thus the first low-temperature cooling circuit (13) are cooled.
4. Kraftfahrzeug nach Anspruch 3, dadurch gekennzeichnet, dass oberhalb der ersten Grenztemperatur jedoch unterhalb einer zweiten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels der Energiespeicher (6) des Hybridantriebs über die Kälteanlage (12) und damit den zweiten Niedertemperaturkühlkreislauf (14) gekühlt ist, wohingegen die Leistungselektronik (7) des Hybridantriebs über den zweiten Kühler (1 1 ) und damit den ersten Niedertemperaturkühlkreislauf (13) gekühlt ist. 4. Motor vehicle according to claim 3, characterized in that above the first limit temperature but below a second limit temperature of the second radiator (1 1) flowing through the coolant energy storage (6) of the hybrid drive via the refrigeration system (12) and thus the second low-temperature cooling circuit (14 ) is cooled, whereas the power electronics (7) of the hybrid drive via the second radiator (1 1) and thus the first low-temperature cooling circuit (13) is cooled.
5 Kraftfahrzeug nach Anspruch 4, dadurch gekennzeichnet, dass oberhalb der zweiten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels sowohl der Energiespeicher (6) des Hybridantriebs als auch die Leistungselektronik (7) des Hybridantriebs jeweils über die Kälteanlage (12) und damit den zweiten Niedertemperaturkühlkreislauf (14) gekühlt sind. 5 motor vehicle according to claim 4, characterized in that above the second limit temperature of the second radiator (1 1) flowing through the coolant both the energy storage (6) of the hybrid drive and the power electronics (7) of the hybrid drive in each case via the refrigeration system (12) and thus the second low-temperature cooling circuit (14) are cooled.
6. Kraftfahrzeug nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die elektrische Maschine (2) des Hybridantriebs vom zweiten Kühler (1 1 ) des ersten Niedertemperaturkühlkreislaufs (12) gekühlt ist. 6. Motor vehicle according to one of claims 1 to 5, characterized in that the electric machine (2) of the hybrid drive from the second radiator (1 1) of the first low-temperature cooling circuit (12) is cooled.
7. Kraftfahrzeug nach Anspruch 6, gekennzeichnet durch mindestens zwei temperaturabhängig angesteuerte Ventile (24, 25), wobei eine Steuerungseinrichtung bei Überschreiten der ersten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels ein erstes temperaturabhängig angesteuertes Ventil (24) derart schaltet, dass der Energiespeicher (6) vom ersten Niedertemperaturkühlkreislauf (13) abgekoppelt und an den zweiten Niedertemperaturkühlkreislauf (14) angekoppelt ist, und wobei die Steuerungseinrichtung bei Überschreiten der zweiten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels zusätzlich ein zweites temperaturabhängig angesteuertes Ventil (25) derart schaltet, dass zusätzlich die Leistungselektronik (7) vom ersten Niedertemperaturkühlkreislauf (13) abgekoppelt und an den zweiten Niedertemperaturkühlkreislauf (14) angekoppelt ist. 7. Motor vehicle according to claim 6, characterized by at least two temperature-dependent actuated valves (24, 25), wherein a control device when exceeding the first limit temperature of the second radiator (1 1) flowing through the coolant, a first temperature-dependent actuated valve (24) switches such that the energy store (6) is decoupled from the first low-temperature cooling circuit (13) and coupled to the second low-temperature cooling circuit (14), and wherein the control device additionally, when the second boundary temperature of the coolant flowing through the second cooler (1 1), a second temperature-dependent actuated valve (25 ) such that in addition the power electronics (7) is decoupled from the first low-temperature cooling circuit (13) and coupled to the second low-temperature cooling circuit (14).
8. Kraftfahrzeug nach Anspruch 7, dadurch gekennzeichnet, dass die Steuerungseinrichtung bei Überschreiten der ersten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels eine temperaturabhängig angesteuerte Pumpe (21 ) des zweiten Niedertemperaturkühlkreislaufs (14) einschaltet. 8. Motor vehicle according to claim 7, characterized in that the control device on exceeding the first limit temperature of the second radiator (1 1) flowing through the coolant, a temperature-controlled pump (21) of the second low-temperature cooling circuit (14) turns on.
9. Kraftfahrzeug nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Elektromotor (2) vom ersten Kühler (8) des Hochtemperatur- kühlkreislaufs (9) gekühlt ist. 9. Motor vehicle according to one of claims 1 to 5, characterized in that the electric motor (2) from the first radiator (8) of the high-temperature cooling circuit (9) is cooled.
10. Kraftfahrzeug nach Anspruch 9, gekennzeichnet durch mindestens ein temperaturabhängig angesteuertes Ventil (28), wobei eine Steuerungseinrichtung bei Überschreiten der ersten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels ein temperaturabhängig angesteuertes Ventil (28) derart schaltet, dass der Energiespeicher (6) vom ersten Niedertemperaturkühlkreislauf (13) abgekoppelt und an den zweiten Niedertemperaturkühlkreislauf (14) angekoppelt ist, und wobei die Steuerungseinrichtung bei Überschreiten der zweiten Grenztemperatur des den zweiten Kühler (1 1 ) durchströmenden Kühlmittels das temperaturabhängig angesteuertes Ventil (28) derart schaltet, dass der Energiespeicher (6) und die Leistungselektronik (7) beide an den zweiten Niedertemperaturkühlkreislauf (14) angekoppelt sind. 10. Motor vehicle according to claim 9, characterized by at least one temperature-dependent actuated valve (28), wherein a control device when exceeding the first limit temperature of the second radiator (1 1) flowing through coolant, a temperature-dependent actuated valve (28) switches such that the energy storage ( 6) is decoupled from the first low-temperature cooling circuit (13) and coupled to the second low-temperature cooling circuit (14), and wherein the control device switches the temperature-dependent actuated valve (28) when the second limit temperature of the coolant flowing through the second radiator (1 1) is exceeded the energy store (6) and the power electronics (7) are both coupled to the second low-temperature cooling circuit (14).
1 1 . Kraftfahrzeug nach einem der Ansprüche 1 bis 1 0, dadurch gekennzeichnet, dass dem ersten Niedertemperaturkühlkreislauf (13) ein erster Temperatursensor (22) und eine erste Pumpe (20) zugeordnet ist, dass dem zweiten Niedertemperaturkühlkreislauf (14) ein zweiter Temperatursensor (23) und eine zweite Pumpe (21 ) zugeordnet ist, und dass dem Energiespeicher (6) und/oder der Leistungselektronik (7) und/oder der elektrische Maschine (2) jeweils ein weiterer Temperatursensor zugeordnet ist. 1 1. Motor vehicle according to one of claims 1 to 1 0, characterized in that the first low-temperature cooling circuit (13) is associated with a first temperature sensor (22) and a first pump (20) that the second low-temperature cooling circuit (14), a second temperature sensor (23) and a second pump (21) is assigned, and that the energy store (6) and / or the power electronics (7) and / or the electric machine (2) is assigned in each case a further temperature sensor.
12. Kraftfahrzeug nach Anspruch 1 1 , dadurch gekennzeichnet, dass eine Steuerungseinrichtung für den ersten Niedertemperaturkühlkreislauf (13) und/oder den zweiten Niedertemperaturkühlkreislauf (14) aus einem Vergleich der Temperaturen, die von dem jeweiligen Temperatursensor (22, 23) des jeweiligen Niedertemperaturkühlkreislaufs (13, 14) und dem Temperatursensor einer von dem jeweiligen Niedertemperaturkühlkreislauf (13, 14) gekühlten Baugruppe (6, 7, 2) des Hybridantriebs der Steuerungseinrichtung bereitgestellt werden, ermittelt, ob die jeweilige Pumpe (22, 23) des jeweiligen Niedertemperaturkühlkreislaufs (13, 14) läuft oder ausgefallen ist. 12. Motor vehicle according to claim 1 1, characterized in that a control device for the first low-temperature cooling circuit (13) and / or the second low-temperature cooling circuit (14) from a comparison of the temperatures of the respective temperature sensor (22, 23) of the respective low-temperature cooling circuit ( 13, 14) and the temperature sensor of one of the respective low-temperature cooling circuit (13, 14) cooled assembly (6, 7, 2) of the hybrid drive of the controller are provided, determines whether the respective pump (22, 23) of the respective low-temperature cooling circuit (13, 14) is running or has failed.
EP10785026A 2009-12-17 2010-11-22 Hybrid motor vehicle having two cooling circuits Withdrawn EP2512852A1 (en)

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