US20130171009A1 - Fan system and method for controlling a fan motor - Google Patents
Fan system and method for controlling a fan motor Download PDFInfo
- Publication number
- US20130171009A1 US20130171009A1 US13/721,375 US201213721375A US2013171009A1 US 20130171009 A1 US20130171009 A1 US 20130171009A1 US 201213721375 A US201213721375 A US 201213721375A US 2013171009 A1 US2013171009 A1 US 2013171009A1
- Authority
- US
- United States
- Prior art keywords
- motor
- fan
- fan motor
- switch
- value
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims description 5
- 230000001419 dependent effect Effects 0.000 claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 abstract description 10
- 238000011109 contamination Methods 0.000 abstract 1
- 238000003475 lamination Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- -1 dirt Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the invention relates to a fan system for carrying out controlled cooling for an internal combustion engine of a motor vehicle, having an electrical fan motor which has a commutator, and having a control unit for controlling the fan motor, the control unit being configured in such a manner that it detects a fault in the fan motor, in particular a power consumption which is increased in comparison with the stipulation, and switches said motor to a voltage-free state if the motor current reaches a predetermined load-dependent switch-off value.
- the invention also relates to a method for controlling a fan motor.
- a fan system of the generic type with blocking detection via the current/voltage characteristic curve is known, for example, from DE 103 26 785 A1.
- Cooling systems for modern motor vehicle drives are provided with powerful fan motors which drive a fan wheel or cause the latter to rotate in order to be able to provide the heat exchangers of the cooling system with a sufficiently high air mass flow even at a standstill, that is to say when the motor vehicle is stationary, or in the case of only low vehicle speeds.
- the fan motors usually used are DC motors whose rotor provided with coils is supplied with electrical energy via a commutator with a brush arrangement.
- fan motors are controlled using a relay circuit, which has up to three series resistors and implements different loads or rotational speeds of the fan, or using power electronics which generate periodic pulse-width-modulated control signals, the duty ratio of which can be varied, for the purpose of virtually infinitely variable control.
- a relay circuit which has up to three series resistors and implements different loads or rotational speeds of the fan, or using power electronics which generate periodic pulse-width-modulated control signals, the duty ratio of which can be varied, for the purpose of virtually infinitely variable control.
- fan motors generally have to be designed for a high maximum required cooling power, the motors are loaded only with a considerably lower power and thus with a lower current for a large part of the total operating time during normal operation.
- Faults may occur during operation of the fan motor, which faults cause, in particular, blocking or sluggishness of the fan motor. Since further energization of the DC motor in such a situation may result in the control electronics and the fan motor being damaged as a result of overheating, an attempt is usually made to detect blocking of the DC motor in good time in order to interrupt the flow of current through the DC motor if blocking is detected. In modern fan systems, the required rotational speed monitoring is not carried out with the aid of a relatively complicated rotational speed sensor, but rather an attempt is made to detect the rotational speed only on the basis of evaluation of a power consumption of the DC motor. It is assumed that the blocked DC motor has a considerably higher power consumption than would be the case when a motor under load is operating correctly.
- the current/voltage characteristic curve of the fan motor is dependent on further factors, for example the temperature of the fan motor, its supply voltage, manufacturing tolerances and the vehicle speed.
- the power consumption of the DC motor may vary by a factor of greater than one, generally at least a factor of two in the case of powerful DC motors, in the same operating state.
- the object of the invention is therefore to avoid or reduce unwanted switching-off of the fan motor, in particular on account of pasting of the commutator.
- control unit is configured in such a manner that it controls the fan motor with at least a virtually maximum power for a predetermined period of time if the motor current reaches a load-dependent switching value which is lower than the associated switch-off value by a predetermined amount.
- the fan system of the present invention has the advantage that, when pasting begins or becomes greater, as a result of which its power consumption approaches the switch-off threshold, the fan motor is switched on, thus cleaning the fan motor and preventing undesirable switch-off, since, on account of the cleaning, the power consumption is moved away from the switch-off threshold if only pasting and not blocking was present. It is also advantageous, in particular, that the fan motor is not switched on independently of the requirements at arbitrary times but rather if more or less great actual pasting is present according to the power consumption.
- the switching values are each approximately 10% lower than the associated switch-off values, which provides advantages, in particular, with respect to a resolution which is not too complex when detecting the current. In particular, there is no need for any additional outlay on hardware.
- the predetermined period of time is less than 60 seconds, preferably approximately 10 seconds. On the one hand, this generally suffices to clean the commutator slots and, on the other hand, the load on the fan motor, whose power consumption is increased in comparison with normal full load on account of the pasting, is kept low.
- the switch-off values and/or the switching values are each stored in the form of a characteristic curve in the control unit. This makes it possible for the required information to be acquired and used in a simpler and more precise manner than proposed, for example, in the generic prior art mentioned at the outset.
- Another aspect of the present invention provides a method for controlling a fan motor for an internal combustion engine of a motor vehicle.
- an item of information relating to the current through the fan motor is determined, and a fault in the fan motor is detected and the fan motor is switched off if the motor current reaches a predetermined load-dependent switch-off value.
- the fan motor is controlled with at least a virtually maximum power for a predetermined period of time if the motor current reaches a load-dependent switching value which is lower than the associated switch-off value by a predetermined amount.
- FIG. 1 shows a schematic block diagram of a fan system according to the invention for an internal combustion engine
- FIG. 2 shows a schematic illustration of a commutator of the fan motor
- FIG. 3 shows a current characteristic curve diagram for an exemplary fan motor.
- FIG. 1 schematically illustrates a block diagram of a fan system 1 for an internal combustion engine (not shown) in a motor vehicle.
- the fan system 1 has a blower with a fan motor 2 .
- the fan motor 2 is electrically connected to a control unit 3 which controls the fan motor 2 in an infinitely variable manner according to the blower requirement of the motor management system and further acquired information, in particular the temperature and the supply voltage U_bat of the fan, in a suitable manner with a manipulated variable, usually a voltage.
- the fan motor 2 has a commutator (not illustrated here).
- Such a commutator 4 is schematically illustrated in FIG. 2 .
- the commutator 4 to which, for example, eight contact laminations 5 are fitted is seen, which contact laminations are arranged in an electrically insulated manner on a shaft 6 of the fan motor 2 .
- the contact laminations 5 are electrically connected to rotor coils of the fan motor 2 .
- Slots which electrically insulate the contact laminations 5 with respect to one another are situated between the contact laminations 5 .
- Contact is made with the laminations 5 with the aid of so-called brushes 7 which are pressed onto the laminations 5 with a spring force, with the result that there is continuous contact.
- An electrical current passes to the rotor coils of the fan motor 2 via the brushes 7 .
- the brushes 7 slide on the laminations 5 and cause, for example, abrasion which preferably settles as dust in the slots between the laminations 5 . Since other materials in the immediate surroundings also settle in the slots, a “paste” which is substantially conductive forms.
- the fan motor 2 is shown, by way of example, for a two-pole motor with two carbon brushes. Four-pole motors with two or four brushes or six-pole motors with two or four or six brushes are also possible.
- a characteristic curve of the motor current I_motor which depicts the fan current requirement dependent on the blower requirement during “normal operation”, is illustrated in the lower region of the current characteristic curve diagram according to FIG. 3 . All of the characteristic curves in FIG. 3 apply, by way of example, to a constant temperature or other factors which are kept constant.
- a current switch-off characteristic curve I_switch-off which can be seen in the upper region of FIG. 3 is stored in the control unit 3 as a function of the motor voltage, supply voltage, temperature, time etc. If the switch-off value dependent on the respective blower requirement (motor voltage) is reached on the characteristic curve I_switch-off, the fan motor 2 is switched to a voltage-free state.
- a second switching characteristic curve I_switch_ 2 is stored in the control unit 3 , again as a function of the motor voltage, supply voltage, temperature, time etc.
- the respective switching value on the characteristic curve I_switch_ 2 is lower than the associated value in the switch-off characteristic curve I_switch-off.
- a value which is lower by approximately 10%, for example, is useful, in particular with regard to a resolution which can be achieved with acceptable outlay when detecting the current.
- the fan motor 2 may also be switched on for a longer period of time if the motor and the control device are designed for a correspondingly lasting increased power consumption. While switching on the fan motor 2 , the upper limit I_switch-off continues to remain in force and is not reached if only pasting and not blocking is present.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Direct Current Motors (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011090069.1 | 2011-12-29 | ||
DE102011090069A DE102011090069A1 (de) | 2011-12-29 | 2011-12-29 | Lüftersystem und Verfahren zur Steuerung eines Lüftermotors |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130171009A1 true US20130171009A1 (en) | 2013-07-04 |
Family
ID=48607841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/721,375 Abandoned US20130171009A1 (en) | 2011-12-29 | 2012-12-20 | Fan system and method for controlling a fan motor |
Country Status (3)
Country | Link |
---|---|
US (1) | US20130171009A1 (de) |
CN (1) | CN103184924B (de) |
DE (1) | DE102011090069A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11399689B2 (en) * | 2017-07-18 | 2022-08-02 | BSH Hausgeräte GmbH | Dishwasher comprising at least one fan impeller in the dishwashing compartment |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013211857A1 (de) * | 2013-06-21 | 2014-12-24 | Robert Bosch Gmbh | Bestimmen einer Schwergängigkeit eines Lüftermotors |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5628908A (en) * | 1993-03-03 | 1997-05-13 | Deka Products Limited Partnership | Peritoneal dialysis systems and methods employing a liquid distribution and pump cassette with self-contained air isolation and removal |
US6551065B2 (en) * | 1999-10-21 | 2003-04-22 | Mitac International Corporation | Fan protection device |
JP2004173348A (ja) * | 2002-11-18 | 2004-06-17 | Calsonic Kansei Corp | 電動モータ制御装置 |
US20040195927A1 (en) * | 2003-04-04 | 2004-10-07 | Robert Bosch Corporation | Electric motor |
US20060004501A1 (en) * | 2004-07-02 | 2006-01-05 | Martin Volkening | Method of operating an engine cooling permanent magnet DC motor to increase motor life |
US20100087979A1 (en) * | 2007-05-15 | 2010-04-08 | Eva Neusinger | Method for cooling components of a motor vehicle |
US7755311B2 (en) * | 2006-03-22 | 2010-07-13 | Funai Electric Co., Ltd. | Fan abnormality detection device |
US7819094B2 (en) * | 2005-04-11 | 2010-10-26 | Robert Bosch Gmbh | Fan system and a method for controlling a fan motor |
US20110006717A1 (en) * | 2009-07-09 | 2011-01-13 | Christos Kyrtsos | Method for Monitoring the Condition of a Commutator of an Electric Motor |
US8264186B2 (en) * | 2008-10-31 | 2012-09-11 | Aisan Kogyo Kabushiki Kaisha | Control devices for fuel pump driving motors |
US20140136077A1 (en) * | 2011-06-16 | 2014-05-15 | Robert Bosch Gmbh | Method for operating an electric fan motor |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10326785B4 (de) | 2003-06-13 | 2018-03-08 | Robert Bosch Gmbh | Verfahren und Steuerschaltung zum Einstellen einer Blockiererkennung für einen Lüftermotor |
-
2011
- 2011-12-29 DE DE102011090069A patent/DE102011090069A1/de not_active Withdrawn
-
2012
- 2012-12-20 US US13/721,375 patent/US20130171009A1/en not_active Abandoned
- 2012-12-28 CN CN201210582348.7A patent/CN103184924B/zh not_active Expired - Fee Related
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5628908A (en) * | 1993-03-03 | 1997-05-13 | Deka Products Limited Partnership | Peritoneal dialysis systems and methods employing a liquid distribution and pump cassette with self-contained air isolation and removal |
US6551065B2 (en) * | 1999-10-21 | 2003-04-22 | Mitac International Corporation | Fan protection device |
JP2004173348A (ja) * | 2002-11-18 | 2004-06-17 | Calsonic Kansei Corp | 電動モータ制御装置 |
US20040195927A1 (en) * | 2003-04-04 | 2004-10-07 | Robert Bosch Corporation | Electric motor |
US20060004501A1 (en) * | 2004-07-02 | 2006-01-05 | Martin Volkening | Method of operating an engine cooling permanent magnet DC motor to increase motor life |
US7819094B2 (en) * | 2005-04-11 | 2010-10-26 | Robert Bosch Gmbh | Fan system and a method for controlling a fan motor |
US7755311B2 (en) * | 2006-03-22 | 2010-07-13 | Funai Electric Co., Ltd. | Fan abnormality detection device |
US20100087979A1 (en) * | 2007-05-15 | 2010-04-08 | Eva Neusinger | Method for cooling components of a motor vehicle |
US8264186B2 (en) * | 2008-10-31 | 2012-09-11 | Aisan Kogyo Kabushiki Kaisha | Control devices for fuel pump driving motors |
US20110006717A1 (en) * | 2009-07-09 | 2011-01-13 | Christos Kyrtsos | Method for Monitoring the Condition of a Commutator of an Electric Motor |
US20140136077A1 (en) * | 2011-06-16 | 2014-05-15 | Robert Bosch Gmbh | Method for operating an electric fan motor |
Non-Patent Citations (1)
Title |
---|
Englsih abstract of JP2004173348A dated 6/2004 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11399689B2 (en) * | 2017-07-18 | 2022-08-02 | BSH Hausgeräte GmbH | Dishwasher comprising at least one fan impeller in the dishwashing compartment |
Also Published As
Publication number | Publication date |
---|---|
CN103184924B (zh) | 2017-06-20 |
DE102011090069A1 (de) | 2013-07-04 |
CN103184924A (zh) | 2013-07-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VOGT, RICHARD;HABERL, NIKOLAS;REEL/FRAME:030950/0267 Effective date: 20130304 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |