US20140136077A1 - Method for operating an electric fan motor - Google Patents

Method for operating an electric fan motor Download PDF

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Publication number
US20140136077A1
US20140136077A1 US14/126,729 US201214126729A US2014136077A1 US 20140136077 A1 US20140136077 A1 US 20140136077A1 US 201214126729 A US201214126729 A US 201214126729A US 2014136077 A1 US2014136077 A1 US 2014136077A1
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United States
Prior art keywords
fan motor
rotational speed
pasting
critical
control unit
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
Application number
US14/126,729
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English (en)
Inventor
Yannick Mougey
Stefan Krug
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
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KRUG, STEFAN, MOUGEY, YANNICK
Publication of US20140136077A1 publication Critical patent/US20140136077A1/en
Abandoned legal-status Critical Current

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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
    • F01P9/00—Cooling having pertinent characteristics not provided for in, or of interest apart from, groups F01P1/00 - F01P7/00
    • F01P9/04—Cooling having pertinent characteristics not provided for in, or of interest apart from, groups F01P1/00 - F01P7/00 by simultaneous or alternative use of direct air-cooling and liquid cooling
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/14—Safety means against, or active at, failure of coolant-pumps drives, e.g. shutting engine down; Means for indicating functioning of coolant pumps
    • 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
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives

Definitions

  • the invention relates to a method for operating an electric fan motor for an internal combustion engine of a motor vehicle. Furthermore, the invention relates to a control unit for carrying out such a method.
  • Engine cooling blower devices are conventionally used to carry out coolant functions in an internal combustion engine of a motor vehicle.
  • a direct current fan motor of the engine cooling blower device generally has a commutator with laminations via which rotor coils of the fan motor are energized by means of contact brushes.
  • a rotational speed of the fan motor is usually predefined by an electronic control unit (ECU) of the motor vehicle in order to ensure that an engine temperature is in an acceptable region which is not critical in terms of technical safety considerations.
  • the engine cooling blower device can be used in such a way that a series of radiators which are arranged one behind the other in the engine compartment of the motor vehicle are cooled by means of the airstream of said device.
  • EP 1 871 998 discloses a method for controlling a fan motor, wherein a control unit actuates a fan motor at a specific time for a predetermined time period with a cleaning manipulated variable which is increased compared to a control manipulated variable, independently of the desired cooling power.
  • the object of the present invention is to make available an improved method for operating an electric fan motor for an internal combustion engine of a motor vehicle which can very largely prevent pasting of the fan motor.
  • the object is achieved with a method for operating an electric fan motor for an internal combustion engine of a motor vehicle, comprising:
  • the rotational speed which is critical in terms of pasting of the fan motor is approximately 2000 rpm (revolutions/minute).
  • a threshold of a rotational speed of the fan motor is advantageously predefined, and it is monitored when pasting of the fan motor is highly probable when said rotational speed is undershot over the long term.
  • One preferred embodiment of the method specifies that an operating duration of the fan motor which is critical in terms of pasting is approximately one hundred hours. As a result, an operating time of the fan motor below the critical rotational speed, above which the fan motor is at a high risk of pasting, is predefined in a defined fashion.
  • the defined time period of the operation of the fan motor at a rotational speed which is higher than the rotational speed which is critical in terms of pasting is approximately ten minutes.
  • a washing time or cleaning time for the fan motor during which the fan motor has to be washed in order to substantially eliminate undesired pasting substances is defined.
  • washing rotational speed corresponds substantially to a maximum rotational speed of the fan motor.
  • a rotational speed at which the fan motor should be operated for as long as the specified washing time, in order to substantially eliminate undesired pasting materials between the commutator laminations of the fan motor is specified in a reproducible fashion.
  • the method is embodied as software of a control unit of the motor vehicle.
  • the method according to the invention can easily be implemented into an already existing control unit of the motor vehicle without large additional expenditure.
  • the software is embodied as part of a control software package, wherein the software is processed cyclically.
  • the resulting execution of the method according to the invention at regular intervals advantageously causes regular and systematic checking of the fan motor for pasting to be carried out. In this way, the pasting can already be systematically very largely prevented in the process of its development.
  • the software within the control software package has a high priority. This supports the fact that the method according to the invention is preferably carried out in a way which promotes freedom of the fan motor from interference and the fan motor can in this way carry out its envisaged cooling functionality over the long term as free of interference as possible.
  • One advantageous development of the method according to the invention provides that the numerical values for the rotational speed and the operating duration of the fan motor which are critical in terms of pasting are determined from experimental and/or technical simulation of investigations of the fan motor. In this way, the numerical values which are respectively best suited for the rotational speed and operating duration which are critical in terms of pasting can advantageously be used on an individual basis for different fan motors. This advantageously promotes adaptability of the method to different types of fan motors.
  • the value for the washing rotational speed is determined from experimental investigations of the fan motor.
  • the respectively best suited washing rotational speed at which the desired cleaning effect is achieved in an optimal way when the method according to the invention is carried out can easily be determined with a high level of accuracy for any type of fan motor.
  • FIG. 1 shows a schematic illustration of a cooling blower device for an internal combustion engine of a motor vehicle for which the method according to the invention can be used;
  • FIG. 2 shows part of an embodiment of the method according to the invention, wherein critical threshold values are defined, monitored and evaluated;
  • FIG. 3 shows a further part of an embodiment of the method according to the invention, wherein, in particular, the washing or cleaning process is illustrated.
  • FIG. 1 shows a highly simplified view of a cooling blower device 100 , which is usually installed in an engine compartment of the motor vehicle (not illustrated) and is used to cool a coolant of an internal combustion engine (not illustrated) of the motor vehicle.
  • the cooling blower device 100 generates an airstream which flows through a radiator (not illustrated) and as a result cools the coolant located in the radiator.
  • the cooling blower device 100 is actuated by a control unit 10 which can be embodied, for example, as an electronic control unit (ECU).
  • the control unit 10 is electrically connected to a fan control unit 20 (Fan Control Module, FCM) which is used to actuate an electric fan motor 30 , connected to the fan control unit 20 , of the cooling blower device 100 .
  • FCM Fan Control Module
  • the control unit 10 transmits, to the fan control unit 20 , a pulse-width-modulated electrical signal which converts the fan control unit 20 to a corresponding electrical voltage in order as a result to actuate the fan motor 30 in terms of rotational speed.
  • the control unit 10 predefines a desired rotational speed to the fan motor 30 and actuates it correspondingly.
  • the pasting effect as mentioned earlier can be undesirably produced as a result of the fan motor 30 being operated below what is referred to as a “pasting threshold” for too long a time period. It has been determined experimentally that, in particular, fan motors 30 which rotate relatively slowly over a long time period are particularly at risk of pasting.
  • a method for detecting a risk of pasting and for avoiding or removing pasting is proposed.
  • the method defines, in a form which can be reproduced in terms of numbers, the specified pasting thresholds and uses them in the method according to the invention as threshold values for a subsequent cleaning process of the commutator of the fan motor 30 .
  • the method according to the invention can preferably be implemented as a software program in the control unit 10 , wherein the control unit 10 can be embodied as a central control unit (for example as an internal combustion engine control unit) of the motor vehicle or as a partial control unit for actuating individual functions within the motor vehicle.
  • the control unit 10 can be embodied as a central control unit (for example as an internal combustion engine control unit) of the motor vehicle or as a partial control unit for actuating individual functions within the motor vehicle.
  • Any control unit which sends rotational speed requests to the fan control unit 20 can advantageously be used to carry out the method according to the invention.
  • a high degree of flexibility during the implementation of the method according to the invention is advantageously obtained.
  • FIG. 2 shows part of an embodiment of the method according to the invention with a schematic flowchart for determining and evaluating pasting thresholds.
  • step S 1 it is checked whether a rotational speed of the fan motor 30 is below a rotational speed of the fan motor 30 which is critical in terms of pasting.
  • a threshold value for this critical rotational speed is typically approximately two thousand revolutions per minute (2000 rpm).
  • step S 2 a timing counter which detects a time period of operation of the fan motor 30 below the threshold rotational speed is not operated.
  • step S 3 the timing counter for detecting the operating duration of the fan motor 30 below the threshold rotational speed is incremented.
  • a subsequent step S 4 it is checked whether the time detected by the timing counter has already reached a threshold value which is critical in terms of pasting of the fan motor 30 .
  • a typical value for this threshold value is approximately one hundred hours. In the event of the critical operating time not yet having been reached, (branch N of step S 4 ), the sequence of the method is continued without further action.
  • FIG. 2 therefore shows in principle checking of conditions under which there is a risk of pasting for the fan motor 30 .
  • the sequence of steps S 1 to S 5 of the method presented in FIG. 2 is processed cyclically within the control unit 10 , which promotes the monitoring of the fan motor 30 for pasting in a systematic and regular way. As a result, the pasting of the fan motor 30 is advantageously already prevented as said pasting begins.
  • FIG. 3 shows a further part of an embodiment according to the invention of a sequence of steps S 6 to S 12 which is carried out in chronological succession to the steps S 1 to S 5 (see FIG. 2 ).
  • a step S 6 it is checked whether the bit switch, which informs the method of the risk of pasting of the fan motor 30 , is set to “true”. In the event of the bit switch not being set to “true” (branch N of S 6 ), the method is continued without further actions. Otherwise (branch Y of step S 6 ), in a subsequent step S 7 a timing counter for detecting a washing duration of the fan motor 30 is incremented.
  • a subsequent step S 8 it is checked whether the washing duration has already reached a predefined length at which cleaning of the commutator of the fan motor 30 is to be expected.
  • the necessary washing or cleaning time for the fan motor 30 is typically approximately ten minutes, wherein the length of the washing period can depend on a washing rotational speed of the fan motor 30 .
  • the washing period is correspondingly shortened, wherein a minimum value of the washing period is reached at the maximum rotational speed of the fan motor 30 .
  • the value of ten minutes of washing time is therefore to be considered a typical value which varies depending on the washing rotational speed of the fan motor 30 , wherein the exemplary embodiment of the method which is shown in FIG. 3 is based on a maximum washing rotational speed of the fan motor 30 .
  • a step S 9 the washing rotational speed of the fan motor 30 is set, in the way illustrated with reference to FIG. 1 , to a value which is above the pasting threshold. Particularly advantageously this rotational speed corresponds substantially to a maximum rotational speed of the fan motor 30 , as a result of which a washing time can be minimized.
  • the washing time for the fan motor 30 is typically approximately ten minutes in this case.
  • step S 10 the timing counter for the detection of the washing time is reset to zero.
  • step S 11 the bit switch, which informs the method of the risk of pasting and initiates the washing of the fan motor 30 is reset to “incorrect”.
  • step S 12 the timing counter for detecting the operating time of the fan motor 30 below the rotational speed which is critical in terms of pasting is also reset to zero.
  • the method according to the invention is particularly advantageously carried out with a high priority within a control software package with the steps illustrated in FIG. 2 and FIG. 3 , which already promotes the reduction and prevention of the pasting as it begins. All the steps in FIG. 2 are carried out here before the steps in FIG. 3 , since the steps S 1 to S 5 in FIG. 2 are necessary in order to determine in a defined fashion the risk of pasting during operation of the fan motor 30 , which is subsequently substantially removed by the steps S 6 to S 12 .
  • the control unit 10 can be any electronic control unit which sends an instruction to the fan control unit 20 to rotate the fan motor 30 at a defined rotational speed.
  • the method according to the invention is preferably implemented in a software package of the control unit 10 .
  • the specified numerical values for the parameters and thresholds are to be understood merely as typical values for an exemplary embodiment of the method.
  • the specified numerical values can be changed as a function of the type and operating circumstances of the fan motor 30 , wherein the values which are respectively the most suitable can be determined, for example, by means of an experimental and/or technical simulation method.
  • the modified values can easily be used to carry out the method.
  • the method according to the invention can advantageously easily be adapted for a multiplicity of different fan motors 30 .
  • a method for operating an electric fan motor for an internal combustion engine of a motor vehicle which systematically provides a way of reproducibly determining and reducing/avoiding undesired pasting of the electric fan motor on the basis of the monitoring of predefined pasting threshold values.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US14/126,729 2011-06-16 2012-04-26 Method for operating an electric fan motor Abandoned US20140136077A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011077652A DE102011077652A1 (de) 2011-06-16 2011-06-16 Verfahren zum Betreiben eines elektrischen Lüftermotors
DE102011077652.4 2011-06-16
PCT/EP2012/057660 WO2012171701A1 (de) 2011-06-16 2012-04-26 Verfahren zum betreiben eines elektrischen lüftermotors

Publications (1)

Publication Number Publication Date
US20140136077A1 true US20140136077A1 (en) 2014-05-15

Family

ID=46046150

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Application Number Title Priority Date Filing Date
US14/126,729 Abandoned US20140136077A1 (en) 2011-06-16 2012-04-26 Method for operating an electric fan motor

Country Status (5)

Country Link
US (1) US20140136077A1 (de)
EP (1) EP2721267A1 (de)
CN (1) CN103717852B (de)
DE (1) DE102011077652A1 (de)
WO (1) WO2012171701A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130171009A1 (en) * 2011-12-29 2013-07-04 Robert Bosch Gmbh Fan system and method for controlling a fan motor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080310967A1 (en) * 2007-06-13 2008-12-18 Franz John P Intelligent air moving apparatus
US20090266313A1 (en) * 2005-04-11 2009-10-29 Robert Bosch Gmbh Fan system and a method for controlling a fan motor
US20090299531A1 (en) * 2008-05-30 2009-12-03 Kabushiki Kaisha Toshiba Electronic device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060004501A1 (en) * 2004-07-02 2006-01-05 Martin Volkening Method of operating an engine cooling permanent magnet DC motor to increase motor life
FR2896013B1 (fr) * 2006-01-10 2010-07-30 Peugeot Citroen Automobiles Sa Procede de protection des moyens de ventilation d'un moteur a combustion interne

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090266313A1 (en) * 2005-04-11 2009-10-29 Robert Bosch Gmbh Fan system and a method for controlling a fan motor
US20080310967A1 (en) * 2007-06-13 2008-12-18 Franz John P Intelligent air moving apparatus
US20090299531A1 (en) * 2008-05-30 2009-12-03 Kabushiki Kaisha Toshiba Electronic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130171009A1 (en) * 2011-12-29 2013-07-04 Robert Bosch Gmbh Fan system and method for controlling a fan motor

Also Published As

Publication number Publication date
CN103717852A (zh) 2014-04-09
WO2012171701A1 (de) 2012-12-20
EP2721267A1 (de) 2014-04-23
DE102011077652A1 (de) 2012-12-20
CN103717852B (zh) 2018-08-21

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Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MOUGEY, YANNICK;KRUG, STEFAN;SIGNING DATES FROM 20131029 TO 20131105;REEL/FRAME:031791/0797

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION