EP0931209A1 - Drive unit with a thermally regulated water pump - Google Patents
Drive unit with a thermally regulated water pumpInfo
- Publication number
- EP0931209A1 EP0931209A1 EP97910425A EP97910425A EP0931209A1 EP 0931209 A1 EP0931209 A1 EP 0931209A1 EP 97910425 A EP97910425 A EP 97910425A EP 97910425 A EP97910425 A EP 97910425A EP 0931209 A1 EP0931209 A1 EP 0931209A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive unit
- unit according
- retarder
- coolant
- speed
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
- F01P2025/66—Vehicle speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2060/00—Cooling circuits using auxiliaries
- F01P2060/06—Retarder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/161—Controlling of coolant flow the coolant being liquid by thermostatic control by bypassing pumps
Definitions
- the invention relates to a drive unit, in particular for a motor vehicle with an internal combustion engine and a transmission, and a cooling circuit comprising a coolant for cooling the engine.
- cooling circuits comprising a coolant, preferably water with the appropriate antifreeze additives, are generally used for cooling engines, in particular internal combustion engines.
- a certain amount of coolant flows through the engine to be cooled per unit of time, absorbs the heat to be dissipated from the internal combustion engine and transports it to a cooler, for example a finned cooler, in which the absorbed and transported amount of heat is released to the environment.
- the cooling capacity of such a system is essentially determined by the amount of coolant circulated.
- the coolant is circulated by means of a coolant pump.
- the flow rate of the coolant pump determines the coolant flow through the cooling circuit.
- Internal combustion engine is that a high pump power is provided even in cases where it is not needed. For example, in summer and winter with such an arrangement, the same amount of coolant is always pumped through the cooling circuit, without taking into account the respective operating parameters (e.g. overrun and
- Partial load operation This leads to unnecessary power consumption on the part of the engine, which leads to unnecessarily high fuel consumption in certain operating situations. This problem becomes particularly serious when a retarder is introduced into the cooling circuit, the working medium of which is also the cooling medium for the engine. Then, for safe heat dissipation, the delivery quantity of the coolant pump must be designed so that the heat can be dissipated even when the retarder is switched on. This requires pumps with very high performance.
- the drive unit according to the invention comprises at least one speed-controlled coolant pump for conveying the coolant in the coolant circuit.
- the Drive unit has means for determining the engine temperature and a control device.
- the temperature can be recorded at sampling intervals ranging from several seconds to milliseconds.
- a control device controls the speed-controlled pump in such a way that a fixed predetermined maximum temperature value for the motor is not exceeded.
- this value can be specified as a function of the current engine power. In this way, it is possible to always run the cooling circuit close to the temperature limit of the engine, which is special is fuel-saving, since the performance of the coolant pump is then optimally adjusted.
- the drive unit according to the invention further comprises a retarder, which retarder can either be operated with a separate working medium, and the coolant is used only for heat exchange or, in a further developed embodiment, the coolant is the working medium of the retarder itself .
- the cooling circuit can be switched on and off, for example by means of a changeover valve which bypasses the coolant past the retarder when it is not working.
- a particularly energy-saving embodiment provides that at least one further coolant pump is provided in addition to the speed-controlled coolant pump. This can either be engine speed dependent, vehicle speed dependent or retarder speed dependent.
- the speed-controlled coolant pump can be designed in such a way that it provides the basic cooling load in the cooling circuit and the additional coolant pump is only switched on under special loads, for example when driving uphill.
- Cooling circuits that include a retarder as particularly advantageous.
- the speed-controlled coolant pump is designed in such a way that it provides sufficient cooling of the engine for every operating situation of the engine when the retarder is not in operation or is switched off.
- the at least one further coolant pump is switched on when the retarder is operated, so that the heat additionally generated in the retarder can still be dissipated safely, ie with the aid of this further coolant pump in combination with the speed-controlled coolant pump sufficient cooling of the engine is guaranteed.
- Capacity is measured so that it provides the basic power required for sufficient cooling of the engine in all operating states.
- the speed-controlled coolant pump is then operated only when the retarder is switched on, in such a way that the maximum engine temperature mentioned above is not exceeded on the engine.
- Coolant is usually water with the appropriate antifreeze.
- the retarder can be both a primary retarder, that is to say a retarder, the speed of which is dependent on the engine speed, or else a secondary retarder, the speed of which is dependent on the driving speed.
- the coolant also serves as the working medium of the retarder.
- the invention is also intended to include the case that the coolant of the engine is not at the same time the working medium of the retarder, but is merely passed, for example, through a heat exchanger and from there the
- the drive unit has, for example, a temperature sensor which is used to determine the engine temperature and is generally attached to the engine. This sensor delivers then a temperature signal to the control device, which controls the speed-controlled coolant pump in relation to its delivery rate.
- the pump in the coolant circuit with a separate control, for example for commissioning and decommissioning.
- Fig. 1 shows a drive unit according to the invention.
- Fig. 2 shows a drive unit according to the invention with a further coolant pump representative of embodiments with several
- Coolant pumps. 3 shows an alternative embodiment of the invention according to FIG. 2.
- FIG. 1 shows a drive unit consisting of a motor 1 and a cooling circuit 3.
- the cooling circuit 3 comprises a cooler 5, one
- Coolant pump 7, which is designed as a speed-controlled coolant pump, and an expansion tank 9, which always ensures sufficient overpressure on the pump suction side. Furthermore, a changeover valve 11 and a retarder 13 are provided in the cooling circuit.
- the invention is in no way limited to only those embodiments in which a retarder is arranged in the coolant circuit. The invention is also applicable if only engine cooling by means of a cooling circuit and a speed-controlled coolant pump is provided.
- a bypass line 40 leads past the cooler and branches at point 42.
- a changeover valve 44 is arranged, which is a 3/2-way valve can be designed.
- the 3/2-way valve has the function of controlling the coolant flow in such a way that it can be led past the cooler either through the cooler or through the bypass line 40.
- the 3/2-way valve controls the cooling flow partially or largely to the cooler 5.
- the 3/2-way switch valve 44 controls the coolant via the bypass line to the engine 1 or to the pump 7.
- the 3/2-way valve can be designed as an expansion control valve or as an electrical or pneumatic continuously regulating valve.
- the cooler can be supported by a fan 15.
- the motor 1 has a temperature sensor 20 as a means for determining the temperature.
- a temperature sensor 20 as a means for determining the temperature.
- several temperature sensors can also be positioned at different locations on the engine or in the coolant line, for example in the direction away from the engine.
- a temperature signal which represents the current engine temperature, is fed to a control device 24 via the signal line 22.
- Actual value which serves as a reference variable in the present control loop, to be averaged over a large number of temperature signals.
- a maximum temperature value for the motor is stored in the control device 24 itself as a setpoint for the control circuit. It is possible that this maximum temperature setpoint is a single value for all operating states of the engine.
- a value that follows the load state of the motor can have a direct effect on the pump speed control, ie the pump control is not solely dependent on the temperature setpoint.
- the detection of the load state can be found in a torque sensor or the control unit for the motor.
- Various control algorithms are now conceivable. So the speed-controlled coolant pump 7 with a certain constant speed are operated and the control only intervenes when the motor temperature exceeds the predetermined maximum temperature value. It is then readjusted, ie the delivery rate is increased.
- the amount of coolant that is conveyed by the engine is always measured by means of the speed-controlled pump so that the engine is run at the maximum permissible coolant temperature, i. H.
- the speed of the coolant pump is regulated by means of the control device 24 both in the event of deviations from higher and lower temperatures than the predetermined target temperature. In this way, it is ensured that the cooling circuit always circulates only the quantity that is required to reach the engine setpoint temperature.
- the coolant pump 7 is speed-controlled, which means that its delivery rate is directly dependent on the speed at which it rotates.
- the advantage of the design according to FIG. 2 can be seen in the fact that the speed-controlled pump 7, which is regulated by the control device 24 as a function of the engine temperature recorded via the sensor 20, can be designed to be very small in terms of its delivery rate, since a further one is present in the cooling circuit Pump 30 is provided, which in the present exemplary embodiment is operated as a function of vehicle speed and provides a basic delivery rate in the cooling circuit.
- the pump 30 is dimensioned such that when the retarder is not operated, ie in the state in which the coolant is directed past the retarder through the bypass line 26, it is sufficient to provide the pumping power required for the engine cooling.
- the control will respond and the control device will activate the speed-controlled pump 7, which will then be operated at precisely such a speed that an additional delivery quantity is made available in order to prevent an inadmissible heating of the motor.
- the control device in turn operates as described in FIG. 1, ie in the event of deviations from a specified motor temperature setpoint, the speed of the pump 7 is set accordingly until this specified setpoint motor temperature is reached.
- the control allows the coolant circuit to always run just so that the engine is close to the maximum permissible temperature. As already shown above, this results in considerable fuel savings.
- the speed-controlled pump 7 is arranged behind the changeover valve 11 immediately before the retarder 13.
- the basic load for the coolant delivery is now taken over by the speed-controlled pump 7. It is in turn controlled as a function of the engine temperature by means of the control device 24 in such a way that the speed-controlled pump is controlled as a function of the specified setpoint and the deviation of the actual value.
- the speed-controlled pump can be designed to be very low in terms of its delivery rate, since it only has to remove the heat generated in the coolant circuit without the retarder being switched on. If the retarder is now switched on, the additional pump 30 is also switched on and the higher delivery rate required for cooling is thereby made available.
- the additional amount of coolant that is used to reduce the heat load that arises from the activation of the retarder is then further increased
- Coolant pump 30 promoted.
- the control device can additionally be connected to the changeover valve 11 via a signal line 32 in order to receive a status signal, which provides information about whether the coolant is through the retarder or via the bypass is bypassed.
- a status signal which provides information about whether the coolant is through the retarder or via the bypass is bypassed.
- the control device 24 it is then possible, for example, to activate the control by means of the control device 24 only when a status signal is present on the signal line 32, which indicates that the coolant is passed through the retarder and serves there as the working medium.
- the drive of the speed-controlled pumps 7 can be operated by means of an electric motor, which in turn is connected to the electrical circuit of the vehicle.
- the control of the electric motors that are suitable for this purpose are known to the person skilled in the art from the prior art, see, for example, "Dubbel, Taschenbuch für den Maschinenbau, 18th edition, 1995, pages V18-V51".
- a plurality of coolant pumps can be provided, one or more of which are speed-controlled coolant pumps.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19641559 | 1996-10-09 | ||
DE19641559A DE19641559A1 (en) | 1996-10-09 | 1996-10-09 | Drive unit with thermally controlled water pump |
PCT/EP1997/005544 WO1998015725A1 (en) | 1996-10-09 | 1997-10-08 | Drive unit with a thermally regulated water pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0931209A1 true EP0931209A1 (en) | 1999-07-28 |
EP0931209B1 EP0931209B1 (en) | 2003-05-07 |
Family
ID=7808240
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97910425A Expired - Lifetime EP0931209B1 (en) | 1996-10-09 | 1997-10-08 | Drive unit with a thermally regulated water pump |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0931209B1 (en) |
DE (2) | DE19641559A1 (en) |
WO (1) | WO1998015725A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19832626C1 (en) * | 1998-07-21 | 2000-03-16 | Daimler Chrysler Ag | Regulation of a cooling circuit of a motor-driven vehicle |
SE521618C2 (en) * | 1998-07-31 | 2003-11-18 | Volvo Lastvagnar Ab | Method and apparatus for venting a coolant system to an internal combustion engine |
DE19914440A1 (en) | 1999-03-30 | 2000-10-05 | Volkswagen Ag | Thermo-controlled automotive engine water cooling pump control dispenses with electrical systems |
DE19930356A1 (en) * | 1999-07-01 | 2001-01-04 | Zahnradfabrik Friedrichshafen | Automatic transmission |
DE10062222A1 (en) * | 2000-12-13 | 2002-06-20 | Zahnradfabrik Friedrichshafen | Procedure for requesting brake power support systems |
DE10242736A1 (en) * | 2002-09-13 | 2004-03-18 | Voith Turbo Gmbh & Co. Kg | Hydrodynamic speed reduction system for motor vehicles, has a sliding rotator and variable gap to the stator and emptying of residual fluid |
FR2929330B1 (en) * | 2008-04-01 | 2010-04-09 | Peugeot Citroen Automobiles Sa | ENGINE COOLING CIRCUIT. |
DE102010009757A1 (en) | 2010-03-01 | 2011-08-25 | Voith Patent GmbH, 89522 | Vehicle cooling circuit, particularly engine cooling circuit, has cooling medium that is circulated in vehicle cooling circuit by cooling medium pump, where vehicle drive motor is cooled by cooling medium |
CN103481871B (en) * | 2013-10-15 | 2015-07-22 | 江苏理工学院 | Cooling liquid medium type hydraulic retarder for vehicle |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2384106A1 (en) * | 1977-03-16 | 1978-10-13 | Sev Marchal | IC engine cooling system - has pump driven by electric motor with control circuit receiving constant voltage input and variable input from temp. transducer |
DE3024209A1 (en) * | 1979-07-02 | 1981-01-22 | Guenter Dr Rinnerthaler | Liq. cooling system for automobile engine with electronic control - regulating circulation pump or variable selective blocking element and by=pass line |
US4434749A (en) * | 1981-03-25 | 1984-03-06 | Toyo Kogyo Co., Ltd. | Cooling system for liquid-cooled internal combustion engines |
JPH0623539B2 (en) * | 1985-05-20 | 1994-03-30 | 本田技研工業株式会社 | Vehicle engine cooling system |
DE3738412A1 (en) * | 1987-11-12 | 1989-05-24 | Bosch Gmbh Robert | ENGINE COOLING DEVICE AND METHOD |
DE3810174C2 (en) * | 1988-03-25 | 1996-09-19 | Hella Kg Hueck & Co | Device for regulating the coolant temperature of an internal combustion engine, in particular in motor vehicles |
JPH0417715A (en) * | 1990-05-07 | 1992-01-22 | Nippondenso Co Ltd | Cooling device of internal combustion engine |
DE4102929A1 (en) * | 1991-01-31 | 1992-08-06 | Man Nutzfahrzeuge Ag | Road vehicle with braking energy recovery - has ancillary units switched on when braking occurs with recovered energy passed to storage units |
SE501444C2 (en) * | 1993-07-01 | 1995-02-20 | Saab Scania Ab | Cooling system for a retarded vehicle |
DE9419818U1 (en) * | 1994-02-09 | 1995-03-16 | Lübeck, Tino, 44866 Bochum | Adjustable electric water pump for cooling internal combustion engines |
DE4445024A1 (en) * | 1994-12-16 | 1995-06-08 | Voith Turbo Kg | Drive unit for vehicle or stationary installation |
DE4446288A1 (en) * | 1994-12-23 | 1995-06-29 | Voith Turbo Kg | Power unit for vehicle |
DE4447166A1 (en) * | 1994-12-30 | 1995-06-08 | Voith Turbo Kg | Vehicle braking system with hydrodynamic retarder |
-
1996
- 1996-10-09 DE DE19641559A patent/DE19641559A1/en not_active Ceased
-
1997
- 1997-10-08 WO PCT/EP1997/005544 patent/WO1998015725A1/en active IP Right Grant
- 1997-10-08 EP EP97910425A patent/EP0931209B1/en not_active Expired - Lifetime
- 1997-10-08 DE DE59710060T patent/DE59710060D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9815725A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0931209B1 (en) | 2003-05-07 |
DE59710060D1 (en) | 2003-06-12 |
DE19641559A1 (en) | 1998-04-16 |
WO1998015725A1 (en) | 1998-04-16 |
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