EP0389502B1 - Device and process for cooling an engine - Google Patents

Device and process for cooling an engine Download PDF

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Publication number
EP0389502B1
EP0389502B1 EP88909289A EP88909289A EP0389502B1 EP 0389502 B1 EP0389502 B1 EP 0389502B1 EP 88909289 A EP88909289 A EP 88909289A EP 88909289 A EP88909289 A EP 88909289A EP 0389502 B1 EP0389502 B1 EP 0389502B1
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EP
European Patent Office
Prior art keywords
coolant
pump
heat exchanger
engine
electronic switching
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.)
Expired - Lifetime
Application number
EP88909289A
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German (de)
French (fr)
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EP0389502A1 (en
Inventor
Peter Nolting
Wolfgang Scheidel
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Priority to DE3738412 priority Critical
Priority to DE19873738412 priority patent/DE3738412A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0389502A1 publication Critical patent/EP0389502A1/en
Application granted granted Critical
Publication of EP0389502B1 publication Critical patent/EP0389502B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00Pumping cooling-air or liquid coolants
    • F01P5/10Pumping liquid coolant; Arrangements of coolant pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/02Controlling of coolant flow the coolant being cooling-air
    • F01P7/026Thermostatic control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/164Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00Pumping cooling-air or liquid coolants
    • F01P5/10Pumping liquid coolant; Arrangements of coolant pumps
    • F01P2005/105Using two or more pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00Pumping cooling-air or liquid coolants
    • F01P5/10Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12Pump-driving arrangements
    • F01P2005/125Driving auxiliary pumps electrically
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P2007/143Controlling of coolant flow the coolant being liquid using restrictions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P2007/146Controlling of coolant flow the coolant being liquid using valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2023/00Signal processing; Details thereof
    • F01P2023/08Microprocessor; Microcomputer
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/04Pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/08Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/08Temperature
    • F01P2025/12Cabin temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/08Temperature
    • F01P2025/13Ambient temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/08Temperature
    • F01P2025/32Engine outcoming fluid temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/08Temperature
    • F01P2025/46Engine parts temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/08Temperature
    • F01P2025/48Engine room temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/60Operating parameters
    • F01P2025/64Number of revolutions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00Measuring
    • F01P2025/60Operating parameters
    • F01P2025/66Vehicle speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2031/00Fail safe
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2031/00Fail safe
    • F01P2031/20Warning devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2031/00Fail safe
    • F01P2031/34Limping home
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00Cooling circuits using auxiliaries
    • F01P2060/08Cabin heater
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/02Controlling of coolant flow the coolant being cooling-air
    • F01P7/04Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/02Controlling of coolant flow the coolant being cooling-air
    • F01P7/10Controlling of coolant flow the coolant being cooling-air by throttling amount of air flowing through liquid-to-air heat exchangers
    • F01P7/12Controlling of coolant flow the coolant being cooling-air by throttling amount of air flowing through liquid-to-air heat exchangers by thermostatic control

Abstract

A device and a process for cooling an engine are disclosed in which at least one coolant pump (22) mechanically driven by the engine (10) to be cooled and at least one coolant pump (23, 54) electrically controlled by an electronic switch gear (24) are arranged in at least one cooling circuit of said engine. The output of the electric pump (23, 54) is established in function of characteristic operating parameters of the engine (10) to be cooled and of other parameters, while the mechanical pump (22) is designed to provide a basic output. A heat exchanger (16) which functions as a radiator is arranged in a first coolant section (15) of the cooling circuit. The cooling capacity of said heat exchanger can be varied by means of a radiator shutter (36) and a fan (37). A second heat exchanger (20) is arranged in another coolant section (19) or in a separate cooling circuit. The heat dissipated by the second heat exchanger is used for heating purposes or to further cool the engine.

Description

    State of the art
  • The invention relates to a device and a method for cooling a drive motor arranged in a motor vehicle according to the type of the independent claims.
  • A vehicle engine cooling system developed for a test vehicle is known from automotive engineering magazine 87 (1985), number 12, pages 638 to 639. The use of an electrically driven water pump is envisaged, with the aid of which the cooling water flow is adapted to the requirements, for example the increased demand at higher speeds or after the engine has been switched off at higher speeds.
  • From DE-A 26 31 121 a cooling device for an internal combustion engine is known which contains a first coolant circuit in which a first heat exchanger is arranged. There is a bypass parallel to the heat exchanger, with the distribution of the heating medium flow to the cooler and to the bypass being carried out by a valve. A pump mechanically driven by the engine to be cooled is arranged in the first coolant circuit and takes over a basic load of the coolant delivery quantity. The first coolant circuit contains a further coolant circuit, in which a heating heat exchanger is arranged. An electrically driven pump is arranged in the further heating circuit and is switched on or off as required. A coolant flow in the further coolant circuit is only provided during heating operation.
  • The invention is based on the object of specifying a method and a device for cooling a drive motor arranged in a motor vehicle, which enables adaptation to the cooling requirement, regardless of whether there is a heating requirement or not.
  • The object is achieved in each case by the features specified in the independent claims.
  • Advantages of the invention
  • In a first embodiment of the device and method according to the invention, a coolant pump driven by the engine to be cooled and an electrically driven coolant pump are provided, the delivery rate of the electrically driven coolant pump being controlled as a function of the coolant temperature detected by a temperature sensor with the aid of an electronic switching device . The mechanically driven pump takes on a basic load, while the conveying capacity of the electrically driven cooling capacity can be adapted. In a further coolant path, which can be released by a valve and is arranged in the coolant circuit, a heat exchanger is arranged, from which a first air duct leading into the vehicle interior and at least a second air duct opening out lead away. A further adaptation to the cooling capacity requirement is possible by means of an air flap which can be actuated by an adjusting device and which is provided for dividing the air heated by this heat exchanger into the channels. In addition to economical operation of the engine, the operating temperature of which can be kept in an optimal range via the coolant, the device and the method according to the invention increase the operational reliability of the engine cooling in that, in the event of a pump failure, limited engine operation or at least one Emergency operation with the other pump is guaranteed. Furthermore, a second embodiment of the device and the method according to the invention which is independent of the first embodiment is provided.
  • The difference from the first embodiment is that in the second embodiment a first and a second coolant circuit are provided which are completely separate from one another. The heat exchanger, which releases the heated air into the channels, is arranged in the second coolant circuit, which furthermore has an additional electrically driven pump for circulating the coolant in the second coolant circuit. With this version, a further improvement of the cooling capacity control is possible.
  • Advantageous further developments and improvements of the devices and methods specified in the independent claims are possible through the measures listed in the subclaims.
  • In addition to the coolant temperature, the electronic switching device that controls the electric pump and the other components, such as a jaulousie, a blower and mixing valves, receives further information, such as, for example, about the engine operating temperature, the engine compartment temperature, the temperature of engine parts, the ambient temperature, the engine speed, the driving speed and a pressure signal of the coolant are supplied. With this information, a precise adjustment of the delivery rate of the electrically driven pump to the required cooling performance is possible.
  • The possibility of maintaining an emergency operation of the engine when one of the coolant pumps fails is particularly advantageous. After a corresponding warning signal has been given or an intervention in the engine control system, engine operation with reduced power is possible.
  • Further details and advantageous developments of the device according to the invention and the method according to the invention result from further subclaims in connection with the following description.
  • drawing
  • Figures 1 and 2 show a first and a second embodiment of an inventive device for engine cooling.
  • Description of the embodiments
  • FIG. 1 shows an engine 10 to be cooled with a first and second coolant circuit connection 11, 12. The coolant emerges from the engine 10 at the first connection 11 and returns to the engine 10 at the second connection 12. The flow direction of the coolant is indicated by arrows 13, 14. The coolant circuit contains a first coolant path 15, in the course of which a first heat exchanger 16, which can be operated as a cooler, is arranged. The first coolant path 15 can be bridged with a second coolant path 17 connected as a bypass. A first controllable valve 18 takes over the distribution of coolant in the first and second paths 15, 17. The valve 18 can be a valve controlled by the coolant temperature. It is preferably designed as an electrically controllable valve. The valve 18 works either continuously or in clocked operation. In clocked operation, the coolant flow to the first or second coolant path 15, 17 is either completely released or completely blocked. The clocked operation is particularly suitable for an electrically controlled valve 18.
  • Furthermore, a third coolant path 19 is provided, in the course of which a second heat exchanger 20 is arranged. The third coolant path 19 can be connected to the bypass 17 via a controllable valve 21. Instead of connecting the third coolant path 19 to the bypass 17, its configuration as a further bypass to the first coolant path 15 can also be provided. The, preferably electrically controllable valve 21 works either continuously or in clocked operation.
  • A coolant pump 22 arranged in the coolant circuit and driven by the engine 10 takes care of the coolant transport. The pump 22 is referred to below as a mechanical pump 22. A further coolant pump 23 is connected in series with the mechanical pump 22 and its delivery rate can be adjusted electrically. The further coolant pump 23 is referred to below as an electrical pump 23.
  • To control the electric pump 23, an electronic switching device 24 is provided, which has operating parameters as input signals of the motor 10 and the cooling circuit are supplied. Specifically, these are the engine speed detected by a speed sensor 25, the engine temperature detected by at least one engine temperature sensor 26, the coolant temperature detected by a coolant temperature sensor 27, the pressure of the coolant in the cooling circuit detected by a pressure sensor 28, and the air temperature immediately detected by an engine compartment temperature sensor 29 Environment of the engine 10, the temperature detected by at least one engine part temperature sensor 30 and the temperature of the air in the further environment (outside temperature) of the engine 10 by an ambient air temperature sensor 31.
  • In the event that the motor 10 is used as a drive motor in a motor vehicle, the electronic switching device 24 receives as further input signals the driving speed detected by a speed sensor 32, the signal emitted by a heating and ventilation controller 33 for specifying at least a target temperature in the vehicle interior, and that Signal delivered by at least one heating air temperature sensor 34.
  • The electronic switching device 24 first outputs an output signal to the electric pump 23. Additional output signals are optionally output to the valves 18, 21, provided the two valves 18, 21 can be controlled electrically. Furthermore, output signals are output to an actuating device 35, which actuates an adjustable blind 36 arranged in front of the first heat exchanger 16 used as a cooler, to at least one fan motor 37, 38 arranged at the two heat exchangers 16, 20 and to an actuating device 39 actuating an air flap 41 , which is arranged in an air duct 40 leading away from the second heat exchanger 20 and which opens the air path either to a heating air duct 42 or to an exhaust air duct 43 which opens out in the open.
  • The electronic switching device 24 also outputs an overtemperature warning signal or a signal that indicates a failure of a coolant pump 22, 23 to a device 44. The device 44 is, for example, a signal lamp on the dashboard of the motor vehicle or part of an engine control. The engine power is throttled after a fault occurs.
  • The device according to the invention according to FIG. 1 works as follows:
    After the engine 10 has been started up, the mechanical pump 22 begins to deliver the coolant. The delivery rate of the mechanical pump 22 depends on the speed of the engine 10 and is set to a value that is not sufficient for the required coolant delivery rate. When the engine 10 is cold, the coolant flows back from the first cooling circuit connection 11 via the bypass 17 and the mechanical pump 22 to the second cooling circuit connection 12. This small circuit requires almost no cooling power, so that the engine 10 quickly reaches the operating temperature at which it has the minimum efficiency. When the coolant temperature, which is detected by the at least one coolant temperature sensor 27, rises, the controllable valve 18 opens, depending on the operating mode either partially or completely, the first coolant path 15 with the first heat exchanger 16 operated as a cooler the adjusting device 35 opens the previously closed blind 36 so that an increased flow of cooling air is passed over the cooler 16. If necessary, the blower motor 37 is switched on to further support the heat dissipation from the cooler 16. Adaptation of the cooling capacity to the cooling capacity requirement is achieved with the electric pump 23 by changing the coolant flow. The adaptation to the cooling power requirement is not only dependent on the coolant temperature recorded by the coolant temperature sensor 27, but depending on other signals. The operating signals of the motor 10, the air temperature in the immediate vicinity of the motor 10, the ambient temperature (outside temperature) which can be measured further away from the motor 10, the temperature of motor parts and the speed of the motor serve as input signals for the electronic switching device 24. When the device according to the invention is used in the motor vehicle, the electronic control unit 24 also receives information about the driving speed.
  • The information about, for example, the engine temperature or the temperature of certain engine parts makes it possible to increase the cooling output before a significant rise in the coolant temperature can be determined by the coolant temperature sensor 27. The inclusion of the speed for the cooling capacity control has the advantage that the coolant flow can be increased with the electric pump 23 before local heating occurs in the engine. The measurement of the driving speed has an influence in particular on the actuation of the blind 36 and the fan 37. At higher driving speeds, it would be inappropriate, for example, to keep the blind 36 closed and to switch on the fan 37. Such inappropriate operating states can be identified and avoided with the electronic switching device 24.
  • Another way to remove heat from the cooling circuit is by releasing the third coolant path 19. In the event that the third coolant path 19 is connected to the bypass 17 via the controllable valve 21, the controllable valve 18 is either adjusted continuously or in a clocked manner Operation controlled in such a way that at least part of the coolant flow flows from the first cooling circuit connection 11 via the third coolant path 19 and the second heat exchanger 20 back to the second cooling circuit connection 12. The air heated at the second heat exchanger 20 is passed on through the channel 40 and through the channels 42, 43. When using of the device according to the invention in the motor vehicle, the heating air duct 42 opens into the vehicle interior. The heating air temperature sensor 34, in conjunction with the electronic switching device 24 and with further temperature sensors (not shown) in the heating system and in the motor vehicle interior, ensures that a target temperature is maintained in the interior. The exhaust air duct 43, which opens out in the open, permits the use of the second heat exchanger 20 as a cooler even at high outside temperatures. In this operating case, the adjusting device 39 closes the heating air duct 42 completely with the air flap 41.
  • If the cooling power applied by the second heat exchanger 20 is sufficient for engine cooling, the valve 18 can completely block the coolant flow through the first coolant path 15. This operating state occurs in vehicle heating in winter. With the help of the electronic switching device 24 it can be determined that the coolant flow through the third coolant path 19 remains blocked during the warm-up phase of the engine 10 and is only opened when a minimum temperature is present. No heating energy is then available during the start-up phase. This operation can either be activated via the temperature controller 33 or is already predetermined in the electronic switching device 24. The heat output via the second heat exchanger 20 can be changed with the blower motor 38 if necessary.
  • The detection of the coolant pressure with the aid of the pressure sensor 28, in conjunction with the coolant temperature, enables a statement to be made about the condition of the coolant by correlation (risk of vapor formation).
  • Figure 2 shows a further advantageous embodiment of the device according to the invention. Those parts of FIG. 2 which correspond to those in FIG. 1 are provided with the same reference numbers. The third coolant path 19 shown in Figure 1 and that in Bypass 17 arranged valve 21 are no longer present in the device according to Figure 2. By contrast, the second heat exchanger 20 is arranged in a separate coolant circuit. The engine 10 therefore has a third coolant connection 50 and a fourth coolant connection 51. The coolant flows from the third coolant connection 50 to the fourth coolant connection 51. The direction of flow is indicated by arrows 52, 53. The coolant is circulated with a third coolant pump 54, the delivery rate of which can preferably be predetermined with an electrical signal.
  • Splitting the cooling circuit into two separate, independent circuits has the advantage that the engine can be cooled differently in some cases. The second cooling circuit with the second heat exchanger 20 is used for vehicle heating or for heat dissipation of peak power for which the first cooling circuit is not designed.
  • With the device according to the invention and the method according to the invention for engine cooling, the coolant temperature is first reached quickly and precisely. The motor 10 is thereby kept in a temperature range with minimal efficiency. The quick heating process reduces wear at low operating temperatures. The adaptation of the cooling capacity to the cooling capacity required for the engine 10 contributes to energy savings, since the previous oversizing of the cooling circuit is no longer necessary. The electronic switching device 24 does not exclude sensible operating states. In particular when using the device according to the invention for cooling a motor vehicle engine, an optimal coordination between the required cooling and heating of the vehicle interior is possible.
  • Instead of the series connection of the two pumps 22, 23, a parallel connection can also be provided if non-return valves or similar devices are arranged in the pump sections.

Claims (21)

  1. Device for cooling an engine (10) arranged in a motor vehicle, having a coolant circuit (13, 14), having a first heat exchanger (16) arranged in the coolant circuit (13, 14), having a bypass (17), leading past the first heat exchanger (16), having a valve (18) for distributing the coolant flow to the first heat exchanger (16) and the bypass (17), having a further coolant path (19), which can be opened by a valve (21) and is arranged in the coolant circuit (13, 14), having a second heat exchanger (20) arranged in the coolant path (19), having at least one coolant pump (22) arranged in the coolant circuit (13, 14) and is driven continuously by the engine (10) to be cooled, the delivery rate of which pump is set to a specifiable part of the required cooling capacity, having an electrically drivable coolant pump (23) arranged in the coolant circuit (13, 14), having at least one temperature sensor (27) for detecting the coolant temperature, and having an electronic switching device (24) for the pump (23), characterised in that the electronic switching device varies the delivery rate of the electrically drivable pump (23) as a function of the coolant temperature detected by the temperature sensor (27), in that the electrically drivable pump (23) is connected in parallel or in series with the mechanically driven pump (22), in that at least one first air duct (42) leading away from the second heat exchanger (20) and into the vehicle interior and at least one second air duct (42, 43) leading away from the second heat exchanger (20) and leading into the open air are provided, and in that an air flap (41) actuable by an actuator (39) is provided for distributing the air heated by the second heat exchanger (20) to the ducts (42, 43).
  2. Device for cooling an engine (10) arranged in a motor vehicle, having a first coolant circuit (13, 14), having a first heat exchanger (16) arranged in the first coolant circuit (13, 14), having a second coolant circuit (52, 53), having a second heat exchanger (20) arranged in the second coolant circuit (52, 53), having at least one coolant pump (22) arranged in the first coolant circuit (13, 14) and driven continuously by the engine (10) to be cooled, the delivery rate of which pump is set to a specified part of the required cooling capacity, having an electrically drivable coolant pump (23) arranged in the first coolant circuit (13, 14), having at least one temperature sensor (27) for detecting the coolant temperature, and having an electronic switching device (24) for the electrically controllable pump (23), characterised in that the first and second coolant circuit (13, 14; 52, 53) are separate from one another and each have separate connections (11, 12; 50, 51) to the engine (10), in that the electrically drivable pump (23) is connected in parallel or in series with the mechanically driven pump (22), in that a further electrically drivable pump (54) is arranged in the second coolant circuit (52, 53), in that the electronic switching device (24) varies the delivery rate of the electrically drivable pumps (23, 54) as a function of the coolant temperature detected by the temperature sensor (27), in that at least one first air duct (42) leading away from the second heat exchanger (20) and into the vehicle interior, and at least one second air duct (43) leading away from the second heat exchanger (20) and into the open air are provided, and in that an air flap (41) actuable by an actuator (39) is provided for distributing the air heated by the second heat exchanger (20) to the ducts (42, 43).
  3. Device according to Claim 1, characterised in that a further electrically drivable coolant pump is provided in the further coolant path (19), the delivery rate of which pump can be variably specified by the switching device (24).
  4. Device according to one of the preceding claims, characterised in that an operating temperature of the engine (10) detected by a sensor (26) is fed as an input signal to the electronic switching device (24).
  5. Device according to one of the preceding claims, characterised in that a temperature detected by a sensor (29) in the immediate vicinity of the engine (10) is fed as an input signal to the electronic switching device (24).
  6. Device according to one of the preceding claims, characterised in that a temperature of at least one engine part to be cooled, said temperature being picked up by at least one sensor (30), is fed as an input signal to the electronic switching device (24).
  7. Device according to one of the preceding claims, characterised in that an ambient temperature detected by a sensor (31) is fed to the electronic switching device (24).
  8. Device according to one of the preceding claims, characterised in that a speed of the engine (10) detected by a sensor (25) is fed to the electronic switching device (24).
  9. Device according to one of the preceding claims, characterised in that a pressure of the coolant detected by a sensor (28) is fed to the electronic switching device (24).
  10. Device according to one of the preceding claims, characterised in that an electric fan (37, 38) which can be controlled by the electronic switching device (24) is provided for air-cooling the heat exchanger (16, 20) arranged in the coolant path (15, 19; 52, 53).
  11. Device according to one of the preceding claims, characterised in that the travelling speed of the motor vehicle detected by a sensor (32) is fed as a further input signal to the electronic switching device (24).
  12. Device according to one of the preceding claims, characterised in that a blind (36) which can be actuated by an electronic switching device via an actuator (35) is provided for influencing the airflow through the heat exchanger (16).
  13. Device according to one of the preceding claims, characterised in that a signal emitted by a heating/ ventilation controller (33) is fed to the electronic switching device (24).
  14. Method for cooling an engine (10) arranged in a motor vehicle, having a coolant circuit (13, 14), having a first heat exchanger (16) arranged in the coolant circuit (13, 14), having a bypass (17), leading past the first heat exchanger (16), having a valve (18) for distributing the coolant flow to the first heat exchanger (16) and the bypass (17), having a further coolant path (19), which can be opened by a valve (21) and is arranged in the coolant circuit (13, 14), having a second heat exchanger (20) arranged in the coolant path (19), having at least one coolant pump (22) arranged in the coolant circuit (13, 14) and driven continuously by the engine (10) to be cooled, the delivery rate of which pump is set to a specifiable part of the required cooling capacity, having an electrically drivable coolant pump (23) arranged in the coolant circuit (13, 14), having at least one temperature sensor (27) for detecting the coolant temperature, and having an electronic switching device (24) for the pump (23), characterised in that the delivery rate of the electrically drivable pump (23) is varied by the electronic switching device (24) as a function of the coolant temperature detected by the temperature sensor (27), in that the electrically drivable pump (23) is connected in parallel or in series with the mechanically driven pump (22), in that at least one first air duct (42) leading away from the second heat exchanger (20) and into the vehicle interior and at least one second air duct (42, 43) leading away from the second heat exchanger (20) and into the open air are provided, and in that the distribution of the air heated by the second heat exchanger (20) between the ducts (42, 43) is performed by an air flap (41) which is actuated by an actuator (39).
  15. Method for cooling an engine (10) arranged in a motor vehicle, having a first coolant circuit (13, 14), having a first heat exchanger (16) arranged in the first coolant circuit (13, 14), having a second coolant circuit (52, 53), having a second heat exchanger (20) arranged in the second coolant circuit (52, 53), having at least one coolant pump (22) arranged in the first coolant circuit (13, 14), and driven continuously by the engine (10) to be cooled, the delivery rate of which pump is set to a specified part of the required cooling capacity, having an electrically drivable coolant pump (23) arranged in the first coolant circuit (13, 14), having at least one temperature sensor (27) for detecting the coolant temperature, and having an electronic switching device (24) for the electrically controllable pump (23), characterised in that the first and second coolant circuit (13, 14; 52, 53) are separate from one another and each have separate connections (11, 12; 50, 51) to the engine (10), in that the electrically drivable pump (23) is connected in parallel or in series with the mechanically driven pump (22), in that a further electrically drivable pump (54) is arranged in the second coolant circuit (52, 53), in that the delivery rates of the electrically controllable pumps (23, 54) are varied by the electronic switching device (24) as a function of the coolant temperature detected by the temperature sensor (27), in that at least one first air duct (42) leading away from the second heat exchanger (20) into the vehicle interior and at least one second air duct (43) leading away from the second heat exchanger (20) and into the open air are provided, and in that the distribution of the air heated by the second heat exchanger (20) between the ducts (42, 43) is performed by an air flap (41) which is actuated by an actuator (39).
  16. Method according to Claim 14 or 15, characterised in that the delivery rate of the electrically driven pump (23, 54) is controlled by the electronic switching device (24) as a function of the engine speed detected by a sensor (25).
  17. Method according to one of Claims 14 to 16, characterised in that the delivery rate of the electrically drivable pump (23, 54) is controlled by the electronic switching device (24) as a function of the temperatures detected by an engine compartment temperature sensor (29) and an engine-part temperature sensor (30).
  18. Method according to one of Claims 14 to 17, characterised in that the delivery rate of the electrically drivable pump (23, 54) is controlled by the electronic switching device (24) as a function of the ambient temperature detected by a sensor (31).
  19. Method according to one of Claims 14 to 18, characterised in that the air heated by the further heat exchanger (20) is used for heating purposes and/or for further engine cooling, the air distribution being carried out by means of the air flap (41).
  20. Method according to one of Claims 14 to 19, characterised in that, in the case of failure of one of the pumps (22, 23, 54), an emergency-running mode is initiated.
  21. Method according to one of Claims 14 to 20, characterised in that the coolant condition is determined from a correlation of the signals emitted by a coolant temperature sensor (27) and by a coolant pressure sensor (28).
EP88909289A 1987-11-12 1988-10-26 Device and process for cooling an engine Expired - Lifetime EP0389502B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3738412 1987-11-12
DE19873738412 DE3738412A1 (en) 1987-11-12 1987-11-12 ENGINE COOLING DEVICE AND METHOD

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT88909289T AT86361T (en) 1987-11-12 1988-10-26 Device and method for cooling the engine.

Publications (2)

Publication Number Publication Date
EP0389502A1 EP0389502A1 (en) 1990-10-03
EP0389502B1 true EP0389502B1 (en) 1993-03-03

Family

ID=6340334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88909289A Expired - Lifetime EP0389502B1 (en) 1987-11-12 1988-10-26 Device and process for cooling an engine

Country Status (7)

Country Link
US (1) US5036803A (en)
EP (1) EP0389502B1 (en)
JP (1) JPH03500795A (en)
KR (1) KR960012136B1 (en)
AT (1) AT86361T (en)
DE (2) DE3738412A1 (en)
WO (1) WO1989004419A1 (en)

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Also Published As

Publication number Publication date
KR900700721A (en) 1990-08-16
KR960012136B1 (en) 1996-09-16
EP0389502A1 (en) 1990-10-03
US5036803A (en) 1991-08-06
DE3738412A1 (en) 1989-05-24
DE3878919D1 (en) 1993-04-08
AT86361T (en) 1993-03-15
WO1989004419A1 (en) 1989-05-18
JPH03500795A (en) 1991-02-21

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