GB2370166A - Series/parallel control of cooling fans - Google Patents

Series/parallel control of cooling fans Download PDF

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Publication number
GB2370166A
GB2370166A GB0021911A GB0021911A GB2370166A GB 2370166 A GB2370166 A GB 2370166A GB 0021911 A GB0021911 A GB 0021911A GB 0021911 A GB0021911 A GB 0021911A GB 2370166 A GB2370166 A GB 2370166A
Authority
GB
United Kingdom
Prior art keywords
fans
cooling system
mode
series
parallel
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.)
Withdrawn
Application number
GB0021911A
Other versions
GB0021911D0 (en
Inventor
David John Beer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB0021911A priority Critical patent/GB2370166A/en
Publication of GB0021911D0 publication Critical patent/GB0021911D0/en
Publication of GB2370166A publication Critical patent/GB2370166A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/68—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more dc dynamo-electric motors
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Positive-Displacement Air Blowers (AREA)

Abstract

A cooling system, especially for motor vehicle engines, comprises two fans (10A, 10B) which can be switched between being connected in series and being connected in parallel. When connected in parallel, both fans run at full speed; when connected in series, both fans run at half speed. Thus, the fan output can be reduced at lower engine temperatures, while still providing full output at higher temperatures.

Description

COOLING FANS This invention relates generally to cooling fans, and in particular to a method of operating a plurality of fans in an efficient manner, according to need.
In certain motor vehicles for example, two cooling fans are provided for the engine, because a single one is deemed inadequate. However, until the engine temperature has reached a certain level, the running of two fans at full output is not needed.
It would therefore be desirable to vary the output of the fans, so that their output is reduced at lower engine temperatures, while still permitting them to produce their full output at engine temperatures above a predetermined level.
Broadly in accordance with the present invention there is provided a cooling system comprising two fans which can function each at a common first output level which is not zero or each at a common second output level which is not zero, the fans in one mode being connected in a series configuration and in the other mode being connected in a parallel configuration.
In a preferred embodiment of the invention, the fans in the said one mode run at 50% of their speed in the said other mode.
The changeover from one mode to the other can be effected by the use of a double-pole changeover relay.
Although the invention is particularly appropriate for a two-fan cooling system in a motor vehicle, it is not to be understood as being limited to such an application. It has universal application to any two-fan, or indeed multi-fan, installation.
In order that the invention may be more fully understood,
reference is made to the accompanying drawing which is a schematic circuit diagram of two fans connected for operation in one or other of two modes.
In the drawing, the two fans are indicated at 10A and 10B connected into a 12 volt electrical circuit between a positive terminal 12 and earth. An electrical lead 14 is connected between the positive terminal 12 and a point 16 between the two fans via one pole 18 of a double-pole changeover relay.
The earth side of fan 10B is connected by a lead 20 to the other pole 22 of the relay which is connected into a lead 24 which connects the negative side of fan 10A to the positive side of fan 10B.
With this arrangement, operation of the changeover relay will cause the two fans to be switched from being connected in series to being connected in parallel, and vice versa. The pole positions when the fans are in series are indicated by full lines, and the pole positions when the fans are in parallel are indicated by broken lines. The two fans 10A, 10B will always be running. When connected in parallel they will both run at full speed, but when connected in series they will both run at half speed.

Claims (7)

  1. CLAIMS : 1. A cooling system comprising two fans which can function in one mode each at a common first output level which is not zero and in another mode each at a common second output level which is not zero, the fans in one mode being connected in a series configuration and in the other mode being connected in a parallel configuration.
  2. 2. A cooling system as claimed in claim 1, in which the fans in one mode run at 50% of their speed in the other mode.
  3. 3. A cooling system as claimed in claim 1 or 2, in which the two fans are arranged to run continuously, with the fans being arranged to run at full speed when connected in parallel, and at half speed when connected in series.
  4. 4. A cooling system as claimed in claim 1, 2 or 3, which includes a double-pole changeover relay to effect the changeover from one mode to the other.
  5. 5. A cooling system as claimed in any preceding claim, arranged for the cooling of a motor vehicle engine.
  6. 6. A multi-fan cooling system comprising a cooling system as claimed in any preceding claim.
  7. 7. A cooling system substantially as hereinbefore described with reference to the accompanying drawing.
GB0021911A 2000-09-07 2000-09-07 Series/parallel control of cooling fans Withdrawn GB2370166A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0021911A GB2370166A (en) 2000-09-07 2000-09-07 Series/parallel control of cooling fans

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0021911A GB2370166A (en) 2000-09-07 2000-09-07 Series/parallel control of cooling fans

Publications (2)

Publication Number Publication Date
GB0021911D0 GB0021911D0 (en) 2000-10-25
GB2370166A true GB2370166A (en) 2002-06-19

Family

ID=9898990

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0021911A Withdrawn GB2370166A (en) 2000-09-07 2000-09-07 Series/parallel control of cooling fans

Country Status (1)

Country Link
GB (1) GB2370166A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1221766A3 (en) * 2001-01-09 2004-10-06 Nissan Motor Company, Limited Motor fan control apparatus
CN106330009A (en) * 2016-08-31 2017-01-11 深圳市若腾科技有限公司 Motor system and motor driving circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1545245A (en) * 1975-07-11 1979-05-02 Citroen Sa System for controlling a cooling circuit
DE2815595A1 (en) * 1978-04-08 1979-10-18 Licentia Gmbh Railway train air conditioner compressor drive - uses double motor with armatures connected in series or in parallel for speed control
GB2026610A (en) * 1978-06-22 1980-02-06 Prosche Ag Hcf An internal combustion engine having an improved electrical circuit for the drive of a cooling air blower

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1545245A (en) * 1975-07-11 1979-05-02 Citroen Sa System for controlling a cooling circuit
DE2815595A1 (en) * 1978-04-08 1979-10-18 Licentia Gmbh Railway train air conditioner compressor drive - uses double motor with armatures connected in series or in parallel for speed control
GB2026610A (en) * 1978-06-22 1980-02-06 Prosche Ag Hcf An internal combustion engine having an improved electrical circuit for the drive of a cooling air blower

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1221766A3 (en) * 2001-01-09 2004-10-06 Nissan Motor Company, Limited Motor fan control apparatus
CN106330009A (en) * 2016-08-31 2017-01-11 深圳市若腾科技有限公司 Motor system and motor driving circuit
CN106330009B (en) * 2016-08-31 2019-07-16 深圳市若腾科技有限公司 Electric motor system and motor drive circuit

Also Published As

Publication number Publication date
GB0021911D0 (en) 2000-10-25

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)