SE1751017A1 - A thermostat device for a cooling system - Google Patents

A thermostat device for a cooling system

Info

Publication number
SE1751017A1
SE1751017A1 SE1751017A SE1751017A SE1751017A1 SE 1751017 A1 SE1751017 A1 SE 1751017A1 SE 1751017 A SE1751017 A SE 1751017A SE 1751017 A SE1751017 A SE 1751017A SE 1751017 A1 SE1751017 A1 SE 1751017A1
Authority
SE
Sweden
Prior art keywords
therrnostat
actuator
valve member
coolant
oil
Prior art date
Application number
SE1751017A
Other languages
Swedish (sv)
Other versions
SE542611C2 (en
Inventor
Joakim Sommansson
Mats Ekman
Ola Sandström
Zoltan Kardos
Original Assignee
Scania Cv Ab
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 Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1751017A priority Critical patent/SE542611C2/en
Priority to DE102018006548.1A priority patent/DE102018006548B4/en
Publication of SE1751017A1 publication Critical patent/SE1751017A1/en
Publication of SE542611C2 publication Critical patent/SE542611C2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
    • F16K11/087—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with spherical plug
    • F16K11/0873—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with spherical plug the plug being only rotatable around one spindle
    • F16K11/0876—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with spherical plug the plug being only rotatable around one spindle one connecting conduit having the same axis as the spindle
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • 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
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • 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
    • F01P2070/00—Details
    • F01P2070/08—Using lubricant pressure as actuating fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
    • F16K31/163—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston
    • F16K31/1635—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston for rotating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/005—Electrical or magnetic means for measuring fluid parameters

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Temperature-Responsive Valves (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The present invention relation relates to a thermostat device of a cooling system for cooling of a combustion (2). The thermostat device comprises a movably arranged thermostat body (8) distributing coolant between a radiator bypass line (9) and a radiator (11). The thermostat device comprises an actuator (14) providing movements of the thermostat body (8), a valve member (15) controlling the supply of a pressurized fluid to the actuator (14) and a control unit (16) controlling the valve member (15) and thus the actuator (14). The valve member (15) is movable to a first valve position, in which the actuator (14) moves the thermostat body (8) in a first direction of movement and to a second valve position in which the actuator (14) moves the thermostat body (8) in a second opposite direction of movement.

Description

A thermostat device for a cooling system BACKGROUND OF THE INVENTION AND PRIOR ART The present invention relates to a therrnostat device for a cooling system according to the preamble of claim l.
The coolant of a cooling system that cools an internal combustion engine in a vehicleshould have an operating temperature within a specific temperature range which maybe 80-1 l0°C. The cooling system comprises a radiator in which the coolant are cooledand a radiator bypass line directing coolant past the radiator. The radiator is usuallyarranged at a front portion of the vehicle where the coolant is cooled by ambient air. Atherrnostat directs the coolant flow to the radiator bypass line when it is in a closedposition and to the radiator when it is in an open position. A conventional Waxtherrnostat switches abruptly between the closed position and open position at aspecific regulating temperature. Thus, the temperature of the radiator may be changedbetween the temperature of ambient air when the therrnostat is closed and thetemperature of the coolant when the therrnostat is open. As a result, the radiator ismany times exposed to rapid temperature changes and high therrnal loads when a waytherrnostat is used. The life of a cooler depends to a large extent on how many times it is heated and cooled.
Electric powered therrnostats are known which comprises a therrnostat body rotated ina housing by means of an electric motor. A control unit controls the operation of theelectric motor. In this case, it is possible to distribute the coolant flow to the radiatorbypass line and the radiator with a high accuracy. In this case, it is possible to reducethe therrnal load on the radiator. However, an electric motor is relatively expensive and space consuming.
SE 1450674-5 shows a cooling system for a combustion engine. The cooling systemcomprises a therrnostat device including a pivotally arranged flow member distributingthe coolant flow from the combustion engine between a radiator bypass line and aradiator. The flow member is moved to a desired position by a cylinder shapedactuator. The cylinder shaped actuator is powered by pressurized coolant. A controlunit controls the supply of pressurized coolant to the actuator by means of a two way valve and thus the positioning of the flow member.
SUMMARY OF THE INVENTION The object of the present invention is to provide an inexpensive and compacttherrnostat device for a cooling system by Which the coolant floW to a radiator can be controlled by a high accuracy.
The above mentioned object is achieved by the therrnostat device according to claim 1.The therrnostat device comprises a movably arranged therrnostat body distributing thecoolant floW to a radiator bypass line and a radiator. The therrnostat body is moved to adesired position by means of an actuator Which is controlled by a valve member and acontrol unit. The actuator comprises at least one chamber Which is divided by amovably arranged actuator member into a first chamber part and a second chamberpart. The valve member is movably arranged to a first valve position in Which it directsa pressurized fluid from a separate fluid system to the first chamber part. The separatefluid system uses another fluid than the coolant circulating in the cooling system. Thesupplied pressurized fluid provides a movement of the actuator member Which istransferred to a movement of the therrnostat body in a first direction of movement. Onthe other hand, the valve member is movably arranged to a second valve position inWhich it directs a pressurized fluid from the separate fluid system to the secondchamber part. In this case, the supplied pressurized fluid provides a movement of theactuator member in an opposite direction Which is transferred to a movement of thetherrnostat body in an opposite second direction of movement. Thus, it is possible toprovide movements of the therrnostat body in two opposite directions and thus todesired position by means of the actuator and the valve member. The separate fluidsystem uses another fluid than the coolant circulating in the cooling system. Such adesign of the therrnostat device makes it is possible to distribute the coolant floWbetween the radiator bypass line and the radiator With a high accuracy. Furthermore, itis possible to give the actuator and the valve member a simple design With small dimensions resulting in an inexpensive and compact therrnostat valve device.
According to an embodiment of the invention, the valve member is movably arrangedto a blocking position in Which it prevents evacuation of the fluid from the firstchamber part and the second chamber part such that the therrnostat body is maintained in a fixed position. During certain operating conditions When, for example, the entire coolant flow is directed to the radiator bypass line or the radiator, it may be appropriateto maintain the therrnostat body in a stable and fixed position in which it directs the entire coolant flow to the radiator bypass line or the radiator.
According to an embodiment of the invention, the valve member is connected to areturn line directing evacuated fluid from the respective chamber parts back to theseparate fluid system. In this case, the use of the pressurized fluid as power source for the actuator does not significantly affect the ordinary operation of the fluid system.
According to an embodiment of the invention, the actuator member may be configuredto obtain a movement resulting in a rotary movement of the therrnostat body.Altematively, the movement of the actuator member may result in another kind of movement of the therrnostat body such as a linear reciprocating movement.
According to an embodiment of the invention, the actuator comprises at least twochambers each provided with movably arranged actuator member which are fixedlyarranged on a rotatable shaft of the therrnostat body. In this case, a movement of theactuator members results, in a very simple manner, to a rotary movement of thetherrnostat body. In case two chambers are used, it is possible to provide a rotarymovement of the therrnostat body in an angular range of up to l80°. In case threechambers are used, it is possible to provide a rotary movement of the therrnostat bodyin an angular range of up to 120°. In case four chambers are used, it is possible to provide a rotary movement of the therrnostat body in an angular range of up to 90°.
According to an embodiment of the invention, the valve member comprises at leastone solenoid configured to move the valve member to different valve positions.Electromagnetic valves in the form of solenoids are relatively small valves which areeasy to control. Furthermore, they are relatively inexpensive. A simple design of thevalve member may comprise one solenoid which moves the valve member to twodifferent valve positions. Altematively, the valve member comprises two solenoidsconfigured to move the valve member into two different valve position and thatsprings of the solenoids are configured to move the valve member in a third valveposition. One of said three valve positions may define a movement of the therrnostatbody in a first direction of movement, one said three valve positions may define amovement of the therrnostat body in a second direction of movement and one of said three valve positions may define a stationary position of the therrnostat body.
According to an embodiment of the invention, the control unit is configured to controlthe positioning of the therrnostat body by means of inforrnation from a sensor sensinga parameter related to the cooling demand of the coolant in the cooling circuit. Such asensor may be a temperature sensor sensing the temperature of the coolant in a suitableposition of the cooling system. Further such parameters which influence on the coolingdemand of the coolant are ambient temperature and the Velocity of a vehicle. Thecoolant obtains, for example, a more effective cooling in the radiator when ambienttemperature is low and when the vehicle has a high speed. A further such parameter isthe load of the combustion engine. In case, the cooling system cools furthercomponents than a combustion engine such as a hydrodynamic retarder, it is suitable toreceive information indicating when the retarder is activated. A further such parametermay comprise information from a GPS-unit inforrning the control unit about the topography of the road ahead.
According to an embodiment of the invention, the control unit may be conf1gured tohave access to stored information about a suitable position for the therrnostat body as afunction of said parameter. Altematively, the control unit may calculate a suitableposition of the therrnostat body in view of information about said parameter. When adesired position of the therrnostat body has been deterrnined, the control unit controlsthe valve member such that the actuator moves the therrnostat body to the deterrninedposition.
According to an embodiment of the invention, the control unit may be conf1gured tocontrol the positioning of the therrnostat body by means of information from a positionsensor sensing the actual position of the therrnostat body. By means of such a positionsensor, it is possible to receive information regarding the actual position of thetherrnostat body and thus the actual distribution of the coolant to the radiator bypassline and the radiator. Such a feedback information makes it is possible to distribute thecoolant between the radiator bypass line and the radiator with a very high accuracy andmaintain a desired temperature of the coolant during substantially all operating conditions.
According to an embodiment of the invention, the therrnostat body is movablyarranged within a position range defined by a first end position in which the therrnostat body directs the entire coolant flow to the radiator bypass line and a second end position in which the therrnostat body directs the entire coolant flow to the radiator. Inthe positions between the end positions of the position range, the coolant is directed tothe radiator bypass line and to the radiator in varying quantities. Preferably, thetherrnostat body is movably arranged to positions in the position range in a steplessmanner. Such a design of the therrnostat device increases further the ability todistribute the coolant between the radiator bypass line and the radiator with a high accuracy.
According to an embodiment of the invention, the separate fluid system is an oilsystem which lubricates the combustion engine. Such a system is usually arrangedclose to a therrnostat device in a cooling system. Thus, it is possible to direct a part ofthe oil flow in relatively short lines to the therrnostat device. Furthermore, the pressurein such an oil system is relatively constant. The valve member may be designed toreceive oil from the oil system in a position downstream of an oil pump circulating oilin the oil system. The oil has it highest pressure in this position of the oil system. It isof course possible to use other kinds of existing fluid systems in a vehicle such as, for example, a compressed air system.
According to an embodiment of the invention, the therrnostat body is movablyarranged in a housing, which comprises an inlet port receiving coolant, a first outletport directing coolant to the radiator bypass line and a second outlet port directingcoolant to the radiator, and that the therrnostat body comprises a first inlet opening, afirst outlet opening movably arranged in relation to the first outlet port and a secondoutlet opening movably arranged in relation to the first outlet port such that coolantflows to the radiator bypass line and the radiator are related to the positions of theoutlets openings of the therrnostat body in relation to the corresponding outlets ports ofthe housing. Such a design of the housing and the therrnostat body makes it possibledistribute the coolant between the radiator bypass line and the radiator in an adjustablemanner with a high accuracy by means of relatively small movements of the therrnostat body in relation to the housing.
BRIEF DESCRIPTION OF THE DRAWINGS In the following a preferred embodiment of the invention is described with reference to the attached drawings, on which: Fig. 1 shows a Cooling system in a vehicle comprising a therrnostat deviceaccording to the invention, Fig. 2 shows the therrnostat device more in detail, Fig. 3 shows a side view of the therrnostat device, Fig. 4 shows an actuator rotating a therrnostat body and Fig. 5a-c shows a valve member directing oil to the actuator.
DETAILLED DESCRIPTION OF A PREFERRED EMBODIMENT OF THEINVENTION Fig. 1 shows a schematically indicated vehicle 1 driven by a combustion engine 2. Thevehicle 1 can be a heavy vehicle and the combustion engine 2 can be a diesel engine oran Otto engine. The combustion engine 2 is cooled by coolant circulating in a coolingsystem. The coolant is circulated by a coolant pump 3 which is arranged in an engineinlet line 4 to the combustion engine 2. After the coolant has cooled the combustionengine 2, it is directed to an engine outlet line 5. In this case, the engine outlet line 5comprises a retarder cooler 6 in which a working medium of a hydraulic retarder iscooled. After the coolant has passed through the retarder cooler 6, it is directed to atherrnostat device. The therrnostat device comprises a housing 7 including a movablyarranged therrnostat body 8. The therrnostat 8 is movably arranged within a positionrange defined by a first end position in which it directs the entire coolant flow in theengine line 5 to a radiator bypass line 9 and a second end position in which it directsthe entire coolant flow, via a radiator inlet line 10, to a radiator 11. The therrnostatbody 8 is positionable in a stepless manner in any number of interrnediate positionsbetween the first end position and the second end position. In such positions, thetherrnostat body 8 distributes the coolant flow to the radiator bypass line 9 and theradiator inlet line 10 in a variable manner. The coolant is cooled in the radiator 11 byambient air which is forced through the cooler 11 by a radiator fan 12 and the ram air.The radiator fan 12 is driven by the combustion engine 2 by means of a suitableconnection. The coolant leaving the radiator 11 is directed back to the engine inlet line 4 via a retum line 13.
An actuator 14 is used to provide rotary movements of the therrnostat body 8 todesired rotary positions in the housing 7. The actuator 14 is activated by a valvemember 15. A control unit 16 controls the valve member 15 by means of information from a position sensor 17 sensing the position of the therrnostat body 8 and a temperature sensor l8 sensing the temperature of the coolant in a suitable position ofthe cooling system. In this case, the temperature sensor l8 senses the temperature ofthe coolant in the engine outlet line 5 in a position downstream of the retarder cooler 6.The combustion engine 2 is lubricated by a schematically indicated oil system l9. Anoil pump 2l pressurizes and circulates oil in the oil system. The oil system l9comprises a therrnostat circuit 20 comprising an inlet line 20a directing pressurized oilto the Valve member l5 and a retum line 20b directing oil back from the Valve memberl5 to the ordinary oil system l9. The retum line 20b may direct the oil back to an oilsump in the oil system. The pressurized oil in the therrnostat circuit 20 is used as apower source for the actuator l4.
Fig. 2 shows the housing 7 and the therrnostat body 8 more in detail. The housing 7comprises an inlet port 7a receiVing coolant from the engine outlet line 5, a first outletport 7b directing coolant to the radiator bypass line 9 and a second outlet port 7cdirecting coolant to the radiator inlet line l0. The therrnostat body 8 has a substantiallyspherical shape with an empty inner space 8d. The therrnostat body 8 is rotatablyarranged in the housing 7 around a rotation axis 22. The rotation axis 22 extendsthrough a shaft 8e of the therrnostat body 8. The shaft 8e is rotatably arranged bymeans of a bearing 23 in the housing 7. The therrnostat body 8 comprises an inletopening 8a which together with the inlet port 7a of the housing 7 defines an inletpassage for coolant in the engine outlet line 5 to the inner space 8d of the therrnostatbody 8. The rotation axis 22 extends centrally through the inlet port 7a and the inletopening 8a. The inlet flow passage defined by the inlet port 7a and the inlet opening 8ahas a constant cross sectional area regardless of the rotary position of the therrnostatbody 8.
The therrnostat body 8 comprises a first outlet opening 8b which together with firstoutlet port 7b defines a first outlet passage directing coolant from the inner space 8d ofthe therrnostat body 8 to the radiator bypass line 9. The therrnostat body 8 comprises asecond outlet opening 8c which together with second outlet port 7c of the housing 7defines a second outlet passage directing coolant from the inner space 8d of thetherrnostat body 8 to the radiator inlet line l0. During rotation of the therrnostat body 8the cross sectional areas of the first outlet passage and the second outlet passage willVary and thus the distribution of coolant to the radiator bypass line 9 and the radiatorinlet line l0. Sealing members 24 are arranged in suitable spaces between the therrnostat body 8 and the housing 7 in order to prevent leakage. The sealing members 24 are arranged in fixed position in the housing 7. The sealing members 24 comprisescontact surface with the therrnostat body 8. At least the contact surfaces of the sealingmembers 24 comprises a low friction material such as PTFE in order to provide a low friction in contact with the rotatable therrnostat body 8.
Fig 3 shows a side of the therrnostat housing 7 provided with the first outlet port 7b.The first outlet port 7b forms together with the first outlet opening 8b of the therrnostatbody 8 the first outlet passage directing coolant to the radiator bypass line 9. The firstoutlet passage has a cross sectional area varying with the rotary position of the firstoutlet opening 8b. In this case, the first outlet opening 8b has a cross sectional areawhich increases continuously between two end positions. The first outlet opening 8b isdesigned such that the first outlet passage has a maximum cross sectional area in thefirst end position of the therrnal body 8 and a minimum or zero cross sectional area inthe second end position of the therrnal body 8. The cross section area of the first flow passage decreases continuously with the distance to the first end position.
On the opposite side of the therrnostat housing 7, the second outlet port 7c and thesecond opening 8c of the therrnostat body 8 define a second flow passage directingcoolant to the radiator inlet line 10. The second opening 8c may have a correspondingshape as the first outlet opening 8b with a cross sectional area varying with the rotaryposition of the second outlet opening 8c. The second outlet opening 8c is designedsuch that the second outlet passage has a maximum cross sectional area in the secondend position of the therrnal body 8 and a minimum or zero cross sectional area in thefirst end position of the therrnal body 8. The cross section area of the first flow passage decreases continuously with the distance to the second end position.
Fig. 4 shows a cross sectional view of the actuator 14. The actuator 14 comprises anactuator body l4a provided with a central bore receiving the shaft 8e of the therrnostatbody 8a. In this case, the actuator body 14a is provided with three chambers 25arranged at constant intervals around the shaft 8e. The actuator 14 comprises threemovably arranged actuator members l4b. Each actuator member 14b divides achamber 25 in a first chamber part 25a and a second chamber part 25b. The firstchamber parts 25a are connected to a first oil line 26a. The second chamber parts 25b are connected to a second oil line 26b.
Fig 5a-c show the valve member 15 more in detail in three different valve positions.The control unit 16 controls the valve member 15 by means of two solenoids SA, SB.The valve member 15 receives pressured oil from the oil inlet line 20a and it retumsthe oil back to the original oil system 19 via the oil retum line 20b. Fig. 5a shows thevalve member 15 in a first valve position when the solenoid S A is activated. In the firstvalve position, the valve member 15 directs pressurized oil from the oil inlet line 20ato the first oil line 26a and the first chamber parts 25a of the actuator 14. Thepressurized oil acts on the actuator members 14b such that they rotate the shaft 8e andthe therrnostat body 8 in a first direction of movement towards the first end position.During this movement, the movable actuator members 14b presses oil out from thesecond chamber parts 25b. The evacuated oil is received in the second oil line 26bwhich directs the oil, via the valve member 15, to the oil retum line 20b and back to the original oil system 19.
Fig. 5b shows the valve member 15 in a blocking position. In this case, the solenoid SBhas been activated and it has moved the valve member to the blocking position. In theblocking position, the valve member 15 directs the pressurized oil from the inlet line20a to the oil retum line 20b and back to the ordinary oil system 19. Furthermore, thevalve member 15 prevents oil to leave the first parts 25a as well as the second parts24b of the chambers 24 via the first oil line 26a and the second oil line 26b.Consequently, the movable actuator member 14b and the therrnostat valve 8 is maintained in a fixed position.
Fig. 5c shows the valve member 15 in a second valve position when none of thesolenoids SA, SB are activated. In this case, the springs of the solenoids SA, SB havemoved the valve member 15 to the second valve position. In the second valve position,the valve member 15 directs the pressurized oil from the oil inlet line 20a to the secondoil line 26b and the second chamber parts 25b. The pressurized oil acts on the actuatormembers 14b such that they rotate the shaft 8e and the therrnostat body 8 in a seconddirection of movement towards the second end position. During this movement, theactuator members 14b pressed out oil from the first chamber parts 25 a. The evacuatedoil is received in the first oil line 26a whereupon the valve member 15 directs the oil, via the retum line 20b, back to the original oil system 19.
During operating of the combustion engine 2, the control unit 16 receives frequently information from the temperature sensor 18 about the temperature of the coolant in the engine Outlet line 5. The control unit 16 also receives information from the positionsensor 17 about the actual rotary position of the therrnostat valve 8. In case the controlunit 16 receives inforrnation indicating that the coolant has a lower temperature than anacceptable minimum temperature, the entire coolant flow has to be directed to theradiator bypass line 9. In order to direct the entire coolant flow to the radiator bypassline 9, the therrnostat body 15 has to be in the first end position. In case, the therrnostatvalve 8 is not already in the first end position, the control unit 16 activates the solenoidSA such that it moves the valve member 15 to the first valve position which is shown inFig. 5a. In this position, the valve member 15 directs the pressurized oil from the oilinlet 20a to the first oil line 26a and the first parts 25a of the chambers 25. At the sametime, the valve member 15 connects the second oil line 26b with the oil retum line 20bsuch that it is possible for the oil in the second parts 25b to leave the chambers 25 viathe second oil line 26b and the oil retum line 20b. The supplied pressurized oil in thefirst parts 25a of the chambers 25 acts on the movable actuator members 14b such thatthe provide a rotary movement of the shaft 8e and the therrnostat body 8 in a first direction of movement towards the first end position.
As soon as the control unit 16 receives inforrnation from the position sensor 17indicating that the therrnostat body 8 has reached the first end position, it activates thesolenoid SB which moves the valve member 15 to the blocking position. In theblocking position, the valve member 15 directs the pressurized oil from the inlet line20a to the oil retum line 20b and back to the ordinary oil system 19. Furthermore, thevalve member 15, prevents oil to leave the first parts 25a and the second parts of thechambers 25. Consequently, the actuator member 14b and the therrnostat valve 8 aremaintained in the first end position in which the therrnostat body directs the entirecoolant flow from the engine outlet line 5 to the radiator bypass line 9. In this case, the coolant is not cooled at all and the temperature of the coolant is increased.
When the control unit 16 receives inforrnation from the temperature sensor 18indicating that the coolant has reach a temperature within a desired temperature range,it is appropriate to provide some cooling of the coolant. The control unit 16 deterrninesa suitable distribution of the coolant between the radiator bypass line 9 and the radiatorinlet line 10 at which the temperature of the coolant is maintained in the desiredtemperature range. After that, the control unit 16 estimates a rotary position of thetherrnostat body 8 at which it provide the deterrnined distribution. The control unit 16may base this estimation on the actual coolant temperature. The control unit may also 11 base this estimation on further parameters such as the speed of the temperature changeof the coolant and inforrnation from a GPS unit about the topography of the roadahead. In order to move the therrnostat body 8 from the first end position to thedeterrnined rotary position, the control unit 16 inactivates the solenoids SA, SB suchthat the valve member 15 is moved the by the springs of the solenoids SA, SB to thesecond valve position. In the second valve position, the valve member 15 directs thepressurized oil from the oil inlet 20a to the second oil line 26b and the second parts25b of the chambers 25. Furthermore, the valve member 15 connects the first oil line26a with the oil retum line 20b such that it is possible for the oil in the first parts 25a toleave the chambers 25 via the first oil line 26a and the oil retum line 20b. Theincreased quantity of pressurized oil in the second parts 25b provide a movement ofthe movable actuator member l4b which results in a rotary movement of the shaft 8eand the therrnostat body 8 from the first end position towards the second end position.As soon as the control unit 16 receives information from the position sensor 17indicating that the therrnostat body 8 has reached the estimated rotary position, thecontrol unit 16 inactivates the solenoid SB such that valve body 15 is moved to theblocking position and the rotary movement of the therrnostat body 8 is stopped in theestimated rotary position. After that, the above mentioned adjustment process of thetherrnostat body 8 is repeated frequently in order to maintain the temperature of the coolant within the desired temperature range.
In case the control unit 16 receives information from the temperature sensor 18indicating that the temperature of the coolant in the engine outlet line 5 is higher than amaximum acceptable temperature, the entire coolant flow has to be directed to theradiator ll. In this case, the control unit 16 inactivates the solenoid SA, SB Such that thesprings of the solenoids SA, SB moves the valve member 15 to the second valveposition. In the second valve position, the valve member 15 directs the pressurized oilfrom the oil inlet 20a, via the second oil line 26b, to the second chamber parts 25b.Furthermore, the valve member 15 connects the first oil line 26a with the oil retum line20b such that it is possible for the oil in the first parts 25a to leave the chambers 25 viathe first oil line 26b and the oil retum line 20b. The supply of pressurized oil to thesecond chamber parts 25b results in a movement of the actuator member 14b and arotary movement of the shaft 8e and the therrnostat body 8 towards the second endposition. As soon as the control unit 16 receives information from the position sensor17 indicating that the therrnostat body 8 has reached the second end position, it activates the solenoid SB. The solenoid SB moves the valve member 15 to the blocking 12 position. The therrnostat Valve 8 in maintained in the second end position until thetemperature of the coolant has decreased to a temperature Within the desired temperature range.
If an error on any of the solenoids SA, SB occurs, the springs of the solenoids SA, SBmove the Valve member 15 to the second Valve position in Which the therrnostat body8 directs the entire coolant flow to the radiator 11. Such a design of the Valve member15 secures that the combustion engine 2 Will not be overheated during such circumstances.
The invention is not restricted to the described embodiment but may be Varied freelyWithin the scope of the claims. The numbers of chambers 25 provided With movablyarranged actuator members 14b may, for example, be Varied. Further, the Valvemember 15 can be designed in different Ways as Well as the shape of the outlet openings 8b, 8c of the therrnostat body 8.

Claims (17)

13 Claims
1. A therrnostat device for cooling system, Wherein the therrnostat device comprises amovably arranged therrnostat body (8) configured to distribute coolant between aradiator bypass line (9) and a radiator (11), an actuator (14) comprising a movablyarranged actuator member (14b) configured to transfer movements to the therrnostatbody (8), a valve member (15) configured to control the supply of a pressurized fluidto the actuator (14) and a control unit (16) configured to control the valve member (15)such that the actuator (14) provides a movement of the therrnostat body (8) to aposition in Which it distributes the coolant between the radiator bypass line (9) and theradiator (11) in a desired manner, characterized in that the actuator (14) comprises atleast one chamber (25) Which is divided by the actuator member (14b) into a firstchamber part (25 a) and a second chamber part (25b), and that the valve member (15) ismovably arranged to a first valve position in Which it directs pressurized fluid from aseparate fluid system to the first chamber part (25 a) at the same time as it alloWsevacuation of fluid from the second chamber part (25b) such that the actuator member(14b) obtains a movement resulting in a movement of the therrnostat body (8) in a firstdirection of movement and to a second valve position in Which it directs pressurizedfluid from said separate fluid system to the second chamber part (25b) at the same timeas it alloWs evacuation of fluid from the first chamber part (25 a) such that the actuatormember (14b) obtains a movement resulting in a movement of the therrnostat body (8) in a second opposite direction of movement.
2. A therrnostat device according to claim 1, characterized in that the valve member(15) is movably arranged to a blocking position in Which it prevents evacuation of thefluid from the first chamber part (25 a) as Well as fluid from the second chamber part(25b) such that the therrnostat body (8) is maintained in a fixed position.
3. A therrnostat device according to claim 1 or 2, characterized in that the valvemember (15) is connected to a retum line (20b) directing evacuated fluid from the respective chamber parts (25a, 25b) back to the separate fluid system.
4. A therrnostat device according to any one of the preceding claims, characterized inthat the actuator member (14b) is configured to obtain a movement resulting in a rotary movement of the therrnostat body (8). 14
5. A therrnostat device according to any one of the preceding claims, characterized inthat the actuator (14) comprises at least two Chambers (25) each provided with amovably arranged actuator member (l4b) which are fixedly arranged on a rotatableshaft (8e) of the therrnostat body (8).
6. A therrnostat device according to any one of the preceding claims, characterized inthat the valve member (15) comprises at least one solenoid (SA, SB) configured to provide the movement of the valve member (l5) to different valve positions.
7. A therrnostat device according to claim 6, characterized in that the valve member(l5) comprises two solenoids (SA, SB) configured to move the valve member (l5) intotwo different valve position and that springs of the solenoids (SA, SB) are conf1gured to move the valve member (l5) in a third valve position.
8. A therrnostat device according to any one of the preceding claims, characterized inthat the control unit (l6) is conf1gured to control the positioning of the therrnostat body(8) by means of information from a sensor (l 8) sensing a parameter related to the cooling demand of the coolant in the cooling circuit.
9. A therrnostat device according to claim 8, characterized in that the control unit (l6)is configured to have access to stored information about a suitable position for the therrnostat body (8) as a function of said parameter.
10.l0. A therrnostat device according to any one of the preceding claims, characterized inthat the control unit (l6) is conf1gured to control the positioning of the therrnostat body(8) by means of information from a position sensor (l7) sensing the actual position ofthe therrnostat body (8).
11.ll. A therrnostat device according to any one of the preceding claims, characterized inthat the therrnostat body (8) is movably arranged within a position range defined by afirst end position in which the therrnostat body (8) directs the entire coolant flow to theradiator bypass line (9) and a second end position in which the therrnostat body (8) directs the entire coolant flow to the radiator (ll).
12. A therrnostat device according to claim ll, characterized in that the therrnostatbody (8) is movably arranged to different positions in said position range in a stepless IIIaIIIICT.
13. A therrnostat device according to any one of the preceding claims, characterized inthat the separate fluid system is an oil system (19) Which lubricates the combustion engine (2).
14. A therrnostat device according to claim 13, characterized in that the valve member(15) is designed to receive oil from the oil system (19) in a position downstream of an oil pump (21) Which circulates oil in the oil system (19).
15. A therrnostat device according to any one of the preceding claims, characterized inthat the therrnostat body is (8) is movably arranged in a housing (7), Which comprisesan inlet port (7a) receiving coolant, a first outlet port (7b) directing coolant to theradiator bypass line (9) and a second outlet port (7c) directing coolant to the radiator(1 1), and that the therrnostat body (8) comprises a first inlet opening (8a), a first outletopening (8b) movably arranged in relation to the first outlet port (7b) and a secondoutlet opening (8c) movably arranged in relation to the first outlet port (7b) such thatcoolant floWs to the radiator bypass line (9) and the radiator (l l) are related to thepositions of the outlets openings (8b, 8c) of the therrnostat body (8) in relation to thecorresponding outlets ports (7b, 7c) of the housing (7).
16. A cooling system, characterized in that the cooling system comprises a therrnostat device according to any one of the preceding claims l-15.
17. A vehicle, characterized in that the vehicle comprises a cooling system according to claim 16.
SE1751017A 2017-08-24 2017-08-24 A thermostat device for a cooling system SE542611C2 (en)

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SE1751017A SE542611C2 (en) 2017-08-24 2017-08-24 A thermostat device for a cooling system
DE102018006548.1A DE102018006548B4 (en) 2017-08-24 2018-08-17 Thermostatic device for a cooling system

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SE1751017A SE542611C2 (en) 2017-08-24 2017-08-24 A thermostat device for a cooling system

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5101862A (en) * 1991-08-08 1992-04-07 Leete Barrett C Rotary actuator and valve control system
FR2800125A1 (en) * 1999-10-20 2001-04-27 Coutier Moulage Gen Ind System for managing the flow of cooling liquid in cooling circuit in motor vehicle comprises control and distribution modules with temperature sensor and control flap to selectively allow the cooling fluid to enter one circuit or another
US20040140445A1 (en) * 2003-01-16 2004-07-22 Muhammad Pervaiz Rotor valve and seal
DE102015012835A1 (en) * 2015-10-02 2016-05-25 Daimler Ag Internal combustion engine for a motor vehicle, in particular a commercial vehicle
WO2017054970A1 (en) * 2015-10-02 2017-04-06 Kendrion (Markdorf) Gmbh Cooling circuit arrangement and method for cooling an engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10345614A1 (en) 2003-09-29 2005-05-12 Bosch Gmbh Robert Three-way valve
FR2935771B1 (en) 2008-09-09 2010-10-08 Bontaz Centre Sa DEVICE FOR CONTROLLING THE SUPPLY OF A SYSTEM WITH A FLUID
SE539388C2 (en) 2014-06-03 2017-09-12 Scania Cv Ab A thermostat device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5101862A (en) * 1991-08-08 1992-04-07 Leete Barrett C Rotary actuator and valve control system
FR2800125A1 (en) * 1999-10-20 2001-04-27 Coutier Moulage Gen Ind System for managing the flow of cooling liquid in cooling circuit in motor vehicle comprises control and distribution modules with temperature sensor and control flap to selectively allow the cooling fluid to enter one circuit or another
US20040140445A1 (en) * 2003-01-16 2004-07-22 Muhammad Pervaiz Rotor valve and seal
DE102015012835A1 (en) * 2015-10-02 2016-05-25 Daimler Ag Internal combustion engine for a motor vehicle, in particular a commercial vehicle
WO2017054970A1 (en) * 2015-10-02 2017-04-06 Kendrion (Markdorf) Gmbh Cooling circuit arrangement and method for cooling an engine

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