US3794896A - Control circuit for cooling fans - Google Patents

Control circuit for cooling fans Download PDF

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Publication number
US3794896A
US3794896A US00319795A US3794896DA US3794896A US 3794896 A US3794896 A US 3794896A US 00319795 A US00319795 A US 00319795A US 3794896D A US3794896D A US 3794896DA US 3794896 A US3794896 A US 3794896A
Authority
US
United States
Prior art keywords
relay
winding
fan
energised
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00319795A
Other languages
English (en)
Inventor
W Holt
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Application granted granted Critical
Publication of US3794896A publication Critical patent/US3794896A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/08—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps

Definitions

  • a control circuit for an electrically driven cooling fan [52] 318/471 317/13 318/473 has a relay for switching the fan in and out. Associated [51 Int. Cl. 205d 23/30 with the relay is resistance means for reducing the [58] held of Search 318/471 3 1 70 1 3 ferential between the on and off points of the fan.
  • the accompanying drawing is a circuit diagram illustrating one example of the invention.
  • a road vehicle incorporates a battery 9 having its negative terminal connected to an earth supply line 10, and its positive terminal connectedto a supply'line 11 through a series circuit including the vehicle ignition switch 8, diode 30 and a resistor 13.
  • the road vehicle is driven by an internal combustion engine indicated'at 17, the engine being cooled by flow cooling water within a conduit 16.
  • a temperature-sensitive-resistor one end of which is connected to the line 10, and the otherend of which is connected through a temperature gauge 14 to the line 11.
  • a junction of the gauge 14 and resistor 15 is connected through a resistor 24 to the line 10, and a variable point on the resistor 24 isconnected to the base of an n-p-n transistor 25, the emitter of which is connected to the base of an n-p-n transistor 26 having its emitter connected to the line 10.
  • the transistors 25, 26 have their collectors connected to the line 11 through a relay winding 22 bridged by a freewheel diode 31, and the winding 22 serves when it is energised to move a contact 23 out of engagement with a contact 21 into engagement with a contact 28.
  • the contact 28 is connected through a variable resistor 29 to the base of the transistor 25, and the contact 21 is connected to the positive battery terminal through a fan motor 19, which when it is operating drives a fan 18 providing cooling air through a part 16a of the conduit 16.
  • the resistor 15 In operation, when the engine temperature is low, the resistor 15 has a high value, and current flowing duct sufficiently to energise the winding 22, so that the contact 23 is in engagement with the contact 21 and the fan motor 19 is energised.
  • the winding 22 is greater than the current at which the winding 22 becomes de-energised.
  • the resistor 29 serves when the winding 22 is energised to de crease the current flowing through the winding 22 by an amount less than the differential between the turnon and turn-off currents of the winding 22.
  • the diodes 30, 31 are incorporated to protect the transistors 25, 26 against transients.
  • the settable resistors 24, 29 determine the operating points of the fan I claim:
  • a control circuit for an electrically driven cooling fan comprising in combination a resistor the value of which is dependent in use on the temperature of an apparatus cooled by the fan, a relay winding having a contact which when the winding is de-energised serves to operate the fan, an amplifier coupled to said resistor and responsive to the value of said resistor, said amplifier having an output decreasing with rise in temperature of the apparatus whereby when the temperature of the apparatus falls to a predetermined level the amplifier output energises said relay winding, and resistance means which is coupled to the amplifier by way of the relay contact when the relay winding is energised, the resistance means serving when the relay is energised to .reduce the current flowing in the relay winding by an amount insufficient to cause the relay winding to become de-energised, so reducing the required increase in the temperature of the apparatus before the relay winding is again de-energised to cause the fan to operate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)
  • Control Of Temperature (AREA)
  • Control Of Ac Motors In General (AREA)
US00319795A 1972-01-12 1972-12-29 Control circuit for cooling fans Expired - Lifetime US3794896A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB138072*[A GB1418291A (en) 1972-01-12 1972-01-12 Control circuit for cooling fans

Publications (1)

Publication Number Publication Date
US3794896A true US3794896A (en) 1974-02-26

Family

ID=9721013

Family Applications (1)

Application Number Title Priority Date Filing Date
US00319795A Expired - Lifetime US3794896A (en) 1972-01-12 1972-12-29 Control circuit for cooling fans

Country Status (7)

Country Link
US (1) US3794896A (enrdf_load_stackoverflow)
JP (1) JPS4879073A (enrdf_load_stackoverflow)
AU (1) AU4961172A (enrdf_load_stackoverflow)
DE (1) DE2301041A1 (enrdf_load_stackoverflow)
FR (1) FR2168094A5 (enrdf_load_stackoverflow)
GB (1) GB1418291A (enrdf_load_stackoverflow)
IT (1) IT976796B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982163A (en) * 1972-12-02 1976-09-21 The Lucas Electrical Company Limited Temperature sensitive electronic switching arrangements
US4168456A (en) * 1977-05-09 1979-09-18 Toyota Jidosha Kogyo Kabushiki Kaisha Apparatus for controlling an electric motor for driving a cooling fan of an internal combustion engine
US4313402A (en) * 1979-11-30 1982-02-02 General Motors Corporation Internal combustion engine radiator cooling fan drive motor control system
US4357565A (en) * 1980-12-05 1982-11-02 Hitachi, Ltd. Control apparatus for variable-speed reversible motor
US4656553A (en) * 1986-01-21 1987-04-07 Comair Rotron, Inc. Electronically programmable universal brushless DC fan with integral tracking and locked rotor protection
US4739232A (en) * 1986-02-21 1988-04-19 Nikko Co., Ltd. Power unit for a battery-driven toy
US4876492A (en) * 1988-02-26 1989-10-24 General Electric Company Electronically commutated motor driven apparatus including an impeller in a housing driven by a stator on the housing
US5929581A (en) * 1997-10-22 1999-07-27 Hewlett-Packard Company Proportional integral fan controller for computer
US6191546B1 (en) 1997-10-22 2001-02-20 Hewlett-Packard Company Proportional integral cooling device controller for electronic device
CN100441878C (zh) * 2006-01-17 2008-12-10 台达电子工业股份有限公司 风扇系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8432942U1 (de) * 1984-11-10 1985-02-14 Ing. Rolf Seifert electronic GmbH, 5828 Ennepetal Lüfter mit Funktionsüberwachung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976463A (en) * 1957-02-01 1961-03-21 Gen Electric Motor-protecting relay
US3416060A (en) * 1965-10-23 1968-12-10 Robertshaw Controls Co Thermally responsive control circuit with automatic reset
US3500074A (en) * 1966-08-15 1970-03-10 Texas Instruments Inc Fail-safe controller
US3668497A (en) * 1970-10-06 1972-06-06 Gen Motors Corp Heater blower motor delay energizing means

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976463A (en) * 1957-02-01 1961-03-21 Gen Electric Motor-protecting relay
US3416060A (en) * 1965-10-23 1968-12-10 Robertshaw Controls Co Thermally responsive control circuit with automatic reset
US3500074A (en) * 1966-08-15 1970-03-10 Texas Instruments Inc Fail-safe controller
US3668497A (en) * 1970-10-06 1972-06-06 Gen Motors Corp Heater blower motor delay energizing means

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982163A (en) * 1972-12-02 1976-09-21 The Lucas Electrical Company Limited Temperature sensitive electronic switching arrangements
US4168456A (en) * 1977-05-09 1979-09-18 Toyota Jidosha Kogyo Kabushiki Kaisha Apparatus for controlling an electric motor for driving a cooling fan of an internal combustion engine
US4313402A (en) * 1979-11-30 1982-02-02 General Motors Corporation Internal combustion engine radiator cooling fan drive motor control system
US4357565A (en) * 1980-12-05 1982-11-02 Hitachi, Ltd. Control apparatus for variable-speed reversible motor
US4656553A (en) * 1986-01-21 1987-04-07 Comair Rotron, Inc. Electronically programmable universal brushless DC fan with integral tracking and locked rotor protection
US4739232A (en) * 1986-02-21 1988-04-19 Nikko Co., Ltd. Power unit for a battery-driven toy
US4876492A (en) * 1988-02-26 1989-10-24 General Electric Company Electronically commutated motor driven apparatus including an impeller in a housing driven by a stator on the housing
US5929581A (en) * 1997-10-22 1999-07-27 Hewlett-Packard Company Proportional integral fan controller for computer
US6011371A (en) * 1997-10-22 2000-01-04 Hewlett-Packard Company Proportional integral fan controller for electronic device
US6191546B1 (en) 1997-10-22 2001-02-20 Hewlett-Packard Company Proportional integral cooling device controller for electronic device
CN100441878C (zh) * 2006-01-17 2008-12-10 台达电子工业股份有限公司 风扇系统

Also Published As

Publication number Publication date
IT976796B (it) 1974-09-10
FR2168094A5 (enrdf_load_stackoverflow) 1973-08-24
JPS4879073A (enrdf_load_stackoverflow) 1973-10-23
AU4961172A (en) 1974-06-06
GB1418291A (en) 1975-12-17
DE2301041A1 (de) 1973-07-19

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