EP2927457B1 - Engine driven unit with a pressurization system of a cooling circuit of an internal combustion engine - Google Patents

Engine driven unit with a pressurization system of a cooling circuit of an internal combustion engine Download PDF

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Publication number
EP2927457B1
EP2927457B1 EP14163018.6A EP14163018A EP2927457B1 EP 2927457 B1 EP2927457 B1 EP 2927457B1 EP 14163018 A EP14163018 A EP 14163018A EP 2927457 B1 EP2927457 B1 EP 2927457B1
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EP
European Patent Office
Prior art keywords
pressure
driven unit
engine driven
control unit
cooling circuit
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.)
Active
Application number
EP14163018.6A
Other languages
German (de)
French (fr)
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EP2927457A1 (en
Inventor
Manuel Varwick
Ralf Gaessler
Martin Scheiger
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.)
Iveco Magirus AG
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Iveco Magirus AG
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Publication date
Application filed by Iveco Magirus AG filed Critical Iveco Magirus AG
Priority to EP14163018.6A priority Critical patent/EP2927457B1/en
Priority to ES14163018T priority patent/ES2796273T3/en
Priority to BR102015007439-5A priority patent/BR102015007439B1/en
Publication of EP2927457A1 publication Critical patent/EP2927457A1/en
Application granted granted Critical
Publication of EP2927457B1 publication Critical patent/EP2927457B1/en
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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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/14—Indicating devices; Other safety devices
    • F01P11/18—Indicating devices; Other safety devices concerning coolant pressure, coolant flow, or liquid-coolant level
    • 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
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/02—Liquid-coolant filling, overflow, venting, or draining devices
    • F01P11/029—Expansion reservoirs
    • 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
    • F01P2025/04—Pressure

Definitions

  • the present invention is related to a pressurization system of a cooling circuit of an internal combustion engine installed in an engine driven unit.
  • the cooling circuit for cooling the engine to a certain pressure, for example, to avoid boiling of the cooling fluid (i. e. water) or cavitation within the cooling circuit.
  • the coolant tank is pressurized by a pressure source like an external air pressure circuit that is also used for other purposes.
  • utility vehicles only represent one example of an engine driven unit to which the present invention can be applied.
  • the invention is applicable to wheeled and/or tracked vehicles of any kind, as well as to ships or emergency generators.
  • provisions must be taken to protect the coolant tank from an over pressure.
  • These provisions can include pressure limiting valves disposed within the pressurizing line, to reduce the high pressure of the common pressure circuit down to a lower pressure. Solenoid valves can be used to control the pressure supply to the coolant tank.
  • DE10201108007 discloses a pressurisation system for a cooling circuit comprising a pump and wherein a control unit controls a pressure regulating valve. Such approach is dependent from the provision of a pressure regulating valve.
  • DE102010024766 A1 discloses a pressurisation system for a cooling circuit comprising a coolant liquid pump which pumps coolant liquid into a cooling unit.
  • a corresponding target pressure can be calculated by the control unit or can be allocated to the operation state while it has been previously stored within a memory of the control unit.
  • This target pressure can be compared to pressure detected by the pressure sensor.
  • the pump can be controlled accordingly to regulate the pressure within the coolant tank to the target pressure. For example, if the detected pressure within the cooling circuit is too low, the control unit will increase the power of the pump to built up a higher pressure. On the other hand, if there is an over pressure in the cooling circuit with respect to the present operation state of the engine driven unit, the control unit controls the pump to lower the pressure supplied via the pressurization line.
  • Fig. 1 and 2 are schematic views of layouts of pressurization systems representing a first embodiment and a second embodiment of the present invention.
  • Fig. 1 is a schematic view of a pressurization system 10 according to a first embodiment of the present invention.
  • This pressurization system 10 is provided to pressurize the cooling circuit of an internal combustion engine installed in an engine driven unit, like, for example, a utility vehicle.
  • a pressure source 12 is connected with a coolant tank 14 by a pressurization line 16.
  • the coolant tank 14 is integrated into the cooling circuit.
  • the pressure source 12 comprises a pump 13 to pressurize air originating from a general air reservoir to be supplied to the coolant tank 14.
  • This air reservoir can be represented by, for example, the environmental atmosphere at a normal environmental pressure level, which is raised continuously by the pump 13 to a higher pressure level, e.g., in a range from 0 bar to about 6 bar (abs) or 600 kPa.
  • Reference 18 denotes an air filter.
  • the power of the pump 13 is variable and can be raised or lowered to increase or decrease the output pressure of the pump 13.
  • a control unit 20 that is electrically connected to the pump 13 via a control line 22.
  • This control unit 20 can also provide other control functions of the operation of the engine and is designated as ECU (engine control unit) accordingly. However, this designation shall not be understood as limiting for the control function of the pump 13.
  • the control unit 20 can rather also be an independent control unit.
  • a pressure sensor 24 is provided to detect the air pressure within the coolant tank 14. This pressure sensor 24 is connected to the control unit 20 via a data line 26 so that present pressure data can be transmitted from the pressure sensor 24 to the control unit 20, representing the actual pressure within the coolant tank 14.
  • the control unit is further connected to a bus system 28 of the engine driven unit via a data interface 30, so that status data transmitted within the bus system 28 can be transmitted via the interface 30 to the control unit 20.
  • These status data comprise data indicating the engine ignition status, i.e. indicating if the engine ignition is activated or not, and a cooling system temperature status data, indicating if the temperature within the cooling system is higher than a predetermined temperature value or not.
  • the status data transmitted within the bus system 28 may also comprise other status data. These status data have in common that they represent an operation state of the engine driven unit. This means that the control unit 20 is provided with an information of this operation state, represented by these status data received via the interface 30.
  • the control unit 20 can calculate a target pressure level of the coolant tank 14 corresponding to the present state of the engine driven unit. This means that one pressure level of the coolant tank 14 may be desired in one determined operation state of the engine driven unit, while another pressure level, i.e. a higher or lower pressure level may be desired in another operation state. Additionally, the control unit 20 receives the pressure data via the data line 26 from the pressure sensor 24. On this basis the control unit 20 can determine whether or not the actual pressure within the coolant tank 14 corresponds to the desired pressure with respect to the present operation state of the engine driven unit. If this is not the case, the operation of the pump 13 can be controlled accordingly.
  • the control unit 20 transmits a control signal via the control line 22 to the pump 13 to increase the pump power and to raise the pressure level.
  • the pump 13 is controlled to decrease its power.
  • the operation of the pump 13 can be controlled by the control unit 20 so as to regulate the pressure within the coolant tank 14 to a pressure level that is determined on the present status date as received via the interface 30.
  • Fig. 2 is a schematic view of a pressurization system 100 according to a second embodiment of the present invention.
  • the pressure sensor 24 is disposed upstream a fluid pump 102 to detect the pressure of the cooling fluid.
  • the other elements of the pressurization system 100 are the same as to the pressurization system 10 of the first embodiment, and so a detailed description thereof is omitted here for the sake of brevity.

Description

  • The present invention is related to a pressurization system of a cooling circuit of an internal combustion engine installed in an engine driven unit.
  • In internal combustion engines, it is common to pressurize the cooling circuit for cooling the engine to a certain pressure, for example, to avoid boiling of the cooling fluid (i. e. water) or cavitation within the cooling circuit. For example, in utility vehicles, the coolant tank is pressurized by a pressure source like an external air pressure circuit that is also used for other purposes. It is to be noted that utility vehicles only represent one example of an engine driven unit to which the present invention can be applied. The invention is applicable to wheeled and/or tracked vehicles of any kind, as well as to ships or emergency generators.
  • Because the pressure of the external pressure circuit is usually very high, provisions must be taken to protect the coolant tank from an over pressure. These provisions can include pressure limiting valves disposed within the pressurizing line, to reduce the high pressure of the common pressure circuit down to a lower pressure. Solenoid valves can be used to control the pressure supply to the coolant tank.
  • In same cases it may be desired to choose between different pressures to be supplied to the coolant tank. In this case it is necessary to provide different pressure limiting valves in different branches of the pressurization line, each pressure limiting valve being set to another output pressure. Moreover, a number of different solenoid valves is necessary for control of the supply through the different branches. Such a layout is disclosed, for example, in DE 10 2007 058 575 B4 .
  • Because the layout of such pressurization systems is very unflexible and comprises a large number of components, it may also be envisaged to use a pressure source different form the external high pressure circuit, namely a pump or a compressor. This pressure source is controlled by a corresponding control unit.
  • DE10201108007 discloses a pressurisation system for a cooling circuit comprising a pump and wherein a control unit controls a pressure regulating valve. Such approach is dependent from the provision of a pressure regulating valve.
  • DE102010024766 A1 discloses a pressurisation system for a cooling circuit comprising a coolant liquid pump which pumps coolant liquid into a cooling unit.
  • Other known pressurisation systems are disclosed in documents DE102011108041 A1 , DE102009018012 A1 , DE102005007781 A1 or WO2008097166 A1 .
  • Despite of the above disclosures, it is still desired to control the pressure within the cooling circuit according to an operation state of the engine driven unit.
  • It is therefore an object of the present invention to provide an engine driven unit with a pressurizing system of the above kind that regulates the pressure supplied to the coolant tank continuously according to an operation state of the engine driven unit by simple means.
  • It is furthermore object of the present invention to provide an engine driven unit with a pressurizing system to avoid cavitation of engine coolant liquid.
  • This object is achieved by an engine driven unit according to claim 1.
  • If a defined operation state of the engine driven unit is recognized by the control unit, a corresponding target pressure can be calculated by the control unit or can be allocated to the operation state while it has been previously stored within a memory of the control unit. This target pressure can be compared to pressure detected by the pressure sensor. The pump can be controlled accordingly to regulate the pressure within the coolant tank to the target pressure. For example, if the detected pressure within the cooling circuit is too low, the control unit will increase the power of the pump to built up a higher pressure. On the other hand, if there is an over pressure in the cooling circuit with respect to the present operation state of the engine driven unit, the control unit controls the pump to lower the pressure supplied via the pressurization line.
  • These and other aspects of the invention will be apparent from and elucidated with reference to preferred embodiments of the invention described hereinafter.
  • Fig. 1 and 2 are schematic views of layouts of pressurization systems representing a first embodiment and a second embodiment of the present invention.
  • Fig. 1 is a schematic view of a pressurization system 10 according to a first embodiment of the present invention. This pressurization system 10 is provided to pressurize the cooling circuit of an internal combustion engine installed in an engine driven unit, like, for example, a utility vehicle. Within the pressurization system 10, a pressure source 12 is connected with a coolant tank 14 by a pressurization line 16. The coolant tank 14 is integrated into the cooling circuit. The pressure source 12 comprises a pump 13 to pressurize air originating from a general air reservoir to be supplied to the coolant tank 14. This air reservoir can be represented by, for example, the environmental atmosphere at a normal environmental pressure level, which is raised continuously by the pump 13 to a higher pressure level, e.g., in a range from 0 bar to about 6 bar (abs) or 600 kPa. Reference 18 denotes an air filter.
  • The power of the pump 13 is variable and can be raised or lowered to increase or decrease the output pressure of the pump 13. For controlling the pump 13, it is provided a control unit 20 that is electrically connected to the pump 13 via a control line 22. This control unit 20 can also provide other control functions of the operation of the engine and is designated as ECU (engine control unit) accordingly. However, this designation shall not be understood as limiting for the control function of the pump 13. The control unit 20 can rather also be an independent control unit.
  • At the coolant tank 14, a pressure sensor 24 is provided to detect the air pressure within the coolant tank 14. This pressure sensor 24 is connected to the control unit 20 via a data line 26 so that present pressure data can be transmitted from the pressure sensor 24 to the control unit 20, representing the actual pressure within the coolant tank 14.
  • The control unit is further connected to a bus system 28 of the engine driven unit via a data interface 30, so that status data transmitted within the bus system 28 can be transmitted via the interface 30 to the control unit 20. These status data comprise data indicating the engine ignition status, i.e. indicating if the engine ignition is activated or not, and a cooling system temperature status data, indicating if the temperature within the cooling system is higher than a predetermined temperature value or not. The status data transmitted within the bus system 28 may also comprise other status data. These status data have in common that they represent an operation state of the engine driven unit. This means that the control unit 20 is provided with an information of this operation state, represented by these status data received via the interface 30.
  • From the status data received, the control unit 20 can calculate a target pressure level of the coolant tank 14 corresponding to the present state of the engine driven unit. This means that one pressure level of the coolant tank 14 may be desired in one determined operation state of the engine driven unit, while another pressure level, i.e. a higher or lower pressure level may be desired in another operation state. Additionally, the control unit 20 receives the pressure data via the data line 26 from the pressure sensor 24. On this basis the control unit 20 can determine whether or not the actual pressure within the coolant tank 14 corresponds to the desired pressure with respect to the present operation state of the engine driven unit. If this is not the case, the operation of the pump 13 can be controlled accordingly. For example, if the present pressure within the coolant tank 14 is lower than the target pressure corresponding to the present operation state of the engine driven unit, the control unit 20 transmits a control signal via the control line 22 to the pump 13 to increase the pump power and to raise the pressure level. On the other hand, if there is an over pressure within the coolant tank 14, the pump 13 is controlled to decrease its power. In this arrangement, the operation of the pump 13 can be controlled by the control unit 20 so as to regulate the pressure within the coolant tank 14 to a pressure level that is determined on the present status date as received via the interface 30.
  • Fig. 2 is a schematic view of a pressurization system 100 according to a second embodiment of the present invention. In this pressurization system 100, the pressure sensor 24 is disposed upstream a fluid pump 102 to detect the pressure of the cooling fluid. The other elements of the pressurization system 100 are the same as to the pressurization system 10 of the first embodiment, and so a detailed description thereof is omitted here for the sake of brevity.

Claims (6)

  1. Engine driven unit, comprising an internal combustion engine, a cooling circuit for said internal combustion engine, and a pressurization system (10) for said cooling circuit, said pressurization system (10), comprising:
    - a coolant tank (14) integrated into the cooling circuit,
    - a pressure source (12) comprising an air pump (13),
    - a pressurization line (16) connecting the air pump (13) and the coolant tank (14) for pressurizing the coolant tank (14), and
    - a control unit (20) for controlling the operation of the air pump (13),
    wherein the pressurization system (10) further comprises at least one pressure sensor (24) disposed to detect a pressure within the cooling circuit, such pressure sensor (24) is connected to the control unit (20) to communicate pressure data representing the detected pressure to the control unit (20), and
    the control unit (20) comprises a data interface (30) for receiving status data representing an operation state of the engine driven unit, and the control unit (20) is provided to control the operation of the air pump (13) so as to regulate the pressure within the cooling circuit to a pressure level that is determined on the base of the present status data received via the data interface (30),
    wherein the power of said air pump (13) is variable and it is controlled to be raised or lowered to respectively increase or decrease the pressure within said cooling circuit, and
    wherein said status data comprises at least the engine ignition status, indicating if the engine ignition is activated or not and a cooling system temperature status, indicating if the temperature within the cooling system is higher than a predetermined temperature value or not.
  2. Engine driven unit according to claim 1, characterized in that the pressure sensor (24) is disposed to detect the air pressure within the coolant tank (14).
  3. Engine driven unit according to claim 1, characterized in that the pressure sensor (24) is disposed to detect the pressure of the cooling fluid.
  4. Engine driven unit according to claim 1, characterized in that the control unit (20) is provided to calculate a control signal from the pressure data and the status data and to transmit the control signal to the air pump (13).
  5. Engine driven unit according to any of the preceding claims, characterized by a data bus system (28) to transmit status data representing an operation state of the engine driven unit, wherein the data interface (30) of the control unit (20) is connected to this data bus system (28).
  6. Engine driven unit according to any of the preceding claims, characterized in that the engine driven unit is a utility vehicle.
EP14163018.6A 2014-04-01 2014-04-01 Engine driven unit with a pressurization system of a cooling circuit of an internal combustion engine Active EP2927457B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14163018.6A EP2927457B1 (en) 2014-04-01 2014-04-01 Engine driven unit with a pressurization system of a cooling circuit of an internal combustion engine
ES14163018T ES2796273T3 (en) 2014-04-01 2014-04-01 Engine-driven unit with a pressurization system of a cooling circuit of an internal combustion engine
BR102015007439-5A BR102015007439B1 (en) 2014-04-01 2015-04-01 ENGINE-DRIVED UNIT COMPRISING A PRESSURIZATION SYSTEM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14163018.6A EP2927457B1 (en) 2014-04-01 2014-04-01 Engine driven unit with a pressurization system of a cooling circuit of an internal combustion engine

Publications (2)

Publication Number Publication Date
EP2927457A1 EP2927457A1 (en) 2015-10-07
EP2927457B1 true EP2927457B1 (en) 2020-04-29

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Application Number Title Priority Date Filing Date
EP14163018.6A Active EP2927457B1 (en) 2014-04-01 2014-04-01 Engine driven unit with a pressurization system of a cooling circuit of an internal combustion engine

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EP (1) EP2927457B1 (en)
BR (1) BR102015007439B1 (en)
ES (1) ES2796273T3 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005007781B4 (en) * 2005-02-19 2013-01-31 Man Truck & Bus Ag Method and arrangement for rapid construction of the system pressure in the coolant circuit of internal combustion engines
SE530868C2 (en) * 2007-02-09 2008-09-30 Volvo Lastvagnar Ab Cooling
DE102007058575B4 (en) 2007-12-05 2013-08-01 Man Truck & Bus Ag Motor vehicle with compressed air based cooling system
DE102009018012B4 (en) * 2009-04-18 2021-02-04 Daimler Ag Method for controlling the system pressure in a coolant circuit
DE102010024766A1 (en) * 2010-06-23 2011-12-29 Daimler Ag Motor car cooling device, has cooling circuit comprising coolant surge tank, and security device provided in coolant surge tank in order to exhaust dominant overpressure from container
DE102011108007A1 (en) * 2011-07-19 2013-01-24 Daimler Ag Method for controlling system pressure in refrigerant circuit of e.g. diesel engine of motor car, involves adjusting target pressure in refrigerant circuit, and checking or controlling tightness of circuit based on adjusted pressure
DE102011108041B4 (en) * 2011-07-19 2022-01-20 Daimler Ag Heatable device for controlling the system pressure in a coolant circuit for an internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
BR102015007439A2 (en) 2018-02-06
ES2796273T3 (en) 2020-11-26
BR102015007439B1 (en) 2022-08-16
EP2927457A1 (en) 2015-10-07

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