GB2237658A - Window winder - Google Patents

Window winder Download PDF

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Publication number
GB2237658A
GB2237658A GB8919794A GB8919794A GB2237658A GB 2237658 A GB2237658 A GB 2237658A GB 8919794 A GB8919794 A GB 8919794A GB 8919794 A GB8919794 A GB 8919794A GB 2237658 A GB2237658 A GB 2237658A
Authority
GB
United Kingdom
Prior art keywords
motor
window
current
rate
control circuit
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Withdrawn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
GB8919794A
Other versions
GB8919794D0 (en
Inventor
Paul Bale
Hogdal Gregory
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.)
AB Electronic Components Ltd
Original Assignee
AB Electronic Components 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 AB Electronic Components Ltd filed Critical AB Electronic Components Ltd
Priority to GB8919794A priority Critical patent/GB2237658A/en
Publication of GB8919794D0 publication Critical patent/GB8919794D0/en
Publication of GB2237658A publication Critical patent/GB2237658A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0851—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load for motors actuating a movable member between two end positions, e.g. detecting an end position or obstruction by overload signal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0854—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load responsive to rate of change of current, couple or speed, e.g. anti-kickback protection

Landscapes

  • Power-Operated Mechanisms For Wings (AREA)
  • Window Of Vehicle (AREA)

Abstract

A window winder for use in motor vehicles comprises an electrical drive motor 10 controlled by a microcontroller 9 which monitors rate of change of current supplied to the motor 10 during closure of a window. If the rate of change of current exceeds a predetermined rate, because, for example, the window is obstructed, the microcontroller will reverse and/or stop the motor. Monitoring during motor startup may be prevented. The microcontroller 9 may also monitor the current supplied to the motor 10 and will reverse and/or stop the motor if the current exceeds a predetermined current value. <IMAGE>

Description

WINDOW WINDER The invention relates to window winders.
The invention relates more particularly to electrically operated window winder apparatuses for use in motor vehicles. Conveniently, the use of such winders enables windows of a vehicle to be opened and closed by a one touch operation of a button or other electrical switch.
However. in such arrangements, it is necessary to prevent the window closing when obstructed, especially if the obstruction could be limb or the head of a person or domestic animal. Such an arrangement for preventing accidents has already been described in UK patent specification 2199963A.
It is an object of the present invention to provide a simpler and/or cheaper arrangement.
According to the invention there is provided a window winder or closure apparatus including an electrical drive motor and a control circuit arranged during closure of the window to monitor continuously the rate of change of current supplied to the motor and to reverse temporarily the direction of and then stop the motor if that rate exceeds a predetermined rate.
The control circuit is preferably inhibited for the first few revolutions of the motor or the first short period of each operation of the motor.
The control circuit may be arranged to reverse temporarily the direction and then stop the motor if the current supplied to the motor at any time exceeds a predetermined current value.
A window winder apparatus according to the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a schematic control circuit for the apparatus; and Figure 2 is a typical current time graphical representation for the apparatus in use.
Whenever the motor runs, the motor current is determined at fixed intervals from which the rate of change of current is determined. The actual rate is compared with a set or predetermined rate and if the actual rate exceeds the predetermined rate the motor is initiated to reverse its direction briefly and then stop. A set or predetermined current is also provided against which the current is compared and if the predetermined current is exceeded a secondary safety override is provided to stop the motor and normally to reverse its direction briefly as above. The predetermined current is calculated with respect to the vehicle battery supply voltage which is measured at regular intervals.
Referring to the drawings, a microcontroller 9 which controls a window drive motor 10, is fed with a signal from a sense resistor 11 via an analogue-to-digital converter 12. The signal from the resistor 11 is filtered to remove motor noise and provide higher accuracy for the analogue-to-digital conversion. A limit switch 13 is fitted to the door of the vehicle to provide a window-closed signal. The switch 13 is positioned such that a window is inside the window guard before the switch is initiated and the motor stopped.
If a reading of current amplitude is taken at time tl and again at time t2 which is a fixed small time interval after tl, the rate of change of current DI/Dt is di = I(t2)-I(tl) dt t2 - tl As the time period tl to t2 is constant Di/dt is proportional to I(t2)-I(tl). Thus the calculation can be used by the system to detect the beginning of a stall condition to initiate an antitrap window back-off. This comprises controlling the motor to reverse its direction briefly and then stopping the motor. Constant frictional forces or slow changes in frictional force do not affect the performance of the control system even though the average current in the motor may change.
However, the current profile or rate of change of current caused by these variations is not significant in use of the apparatus.
The motor is initiated to cause the window to open or close by a one touch operation using an appropriate of switches 14 or 15. The system does not respond to rates of change of current for the first 432 ms and so the control system ignores any high values of rates of change of current caused by surge currents when first starting the motor. In this small time interval the window will in any event have moved an insufficient distance and so not cause any damage to a trapped object or obstruction.
The control system also monitors the actual motor current level at all times (see Figure 2) and causes the motor to reverse briefly and/or to stop if a predetermined set value of this current is exceeded.
The described control circuit may be used with a one touch initiation system and also with switches which selectively provide one touch operation as well as manually controlled switching. Normally, the described control circuit is arranged to monitor the rate of change of motor current only when the motor is not under manual switching control, but the control system could be arranged to override a manually controlled operation if desired. The predetermined rate of change of current and/or the predetermined maximum current level may be adjustable in a manner to allow the operator to make changes in the values set from time to time to compensate for the operation of the motor varying through environmental changes or normal "wear and tear".

Claims (5)

CLAIMS:
1. A window winder or closure apparatus comprising an electrical drive motor and a control circuit arranged to monitor continuously the rate of change of current supplied to the motor during closure of the window and to reverse temporarily the direction of and then stop the motor if that rate exceeds a predetermined rate.
2. A window winder as claimed in claim 1, wherein the control circuit is inhibited for the first few revolutions of the motor.
3. A window winder as claimed in claim 1, wherein the control circuit is inhibited for an initial period of each operation of the motor.
4. A window winder as claimed in claim 1, 2 or 3, wherein the control circuit is arranged to monitor the current supplied to the motor during closure of the window and to reverse temporarily the direction of and then stop the motor if the current supplied to the motor at any time exceeds a predetermined current value.
5. A window winder or closure apparatus substantially as hereinbefore described with reference to, and as illustrated in, the accompanying drawings.
GB8919794A 1989-09-01 1989-09-01 Window winder Withdrawn GB2237658A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8919794A GB2237658A (en) 1989-09-01 1989-09-01 Window winder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8919794A GB2237658A (en) 1989-09-01 1989-09-01 Window winder

Publications (2)

Publication Number Publication Date
GB8919794D0 GB8919794D0 (en) 1989-10-18
GB2237658A true GB2237658A (en) 1991-05-08

Family

ID=10662388

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8919794A Withdrawn GB2237658A (en) 1989-09-01 1989-09-01 Window winder

Country Status (1)

Country Link
GB (1) GB2237658A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269282A (en) * 1992-07-29 1994-02-02 Gen Electric Co Plc Controlling movement by electric motor using current monitoring
EP0595452A1 (en) * 1992-09-02 1994-05-04 Sumitomo Wiring Systems, Ltd. Control apparatus for power window
GB2274671B (en) * 1993-01-14 1997-04-23 Eclipse Blinds Ltd Blind or curtain suspension system
GB2323941A (en) * 1994-02-28 1998-10-07 Ohi Seisakusho Co Ltd Controlling an opening/closing member, eg a vehicle window
GB2286906B (en) * 1994-02-28 1998-11-18 Ohi Seisakusho Co Ltd Drive control device for opening/closing member
EP1389817A1 (en) * 2002-07-26 2004-02-18 STMicroelectronics S.r.l. Method and circuit for detecting a torque variation of an electric DC motor
WO2008045624A1 (en) * 2006-10-10 2008-04-17 Square D Company Dc motor mechanical shock protection system
CN109700173A (en) * 2018-05-31 2019-05-03 乐歌人体工学科技股份有限公司 Same table control method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1395749A (en) * 1972-06-05 1975-05-29 Westinghouse Brake & Signal Controlling the operation of a door
GB2010957A (en) * 1977-12-21 1979-07-04 Daimler Benz Ag Method and Apparatus for Operating a Servo-Actuated Closing Device
GB2053513A (en) * 1979-07-04 1981-02-04 Rau Swf Autozubehoer Circuit arrangement for driving a movable element
DE3332813A1 (en) * 1983-09-12 1985-03-28 Küster & Co GmbH, 6332 Ehringshausen Method for initiating reversal of the direction of movement of an electromotively driven window pane in a motor vehicle and device for carrying out the method
WO1985001773A1 (en) * 1983-10-12 1985-04-25 Byrne & Davidson Industries Limited Obstruction detection means
EP0148318A1 (en) * 1983-12-22 1985-07-17 Helmut Hund K.G. Safety circuit for motor-driven window lift assemblies for automobile vehicles and similar vehicles
GB2169105A (en) * 1984-11-26 1986-07-02 Automatic Roller Doors Door or gate obstruction control

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1395749A (en) * 1972-06-05 1975-05-29 Westinghouse Brake & Signal Controlling the operation of a door
GB2010957A (en) * 1977-12-21 1979-07-04 Daimler Benz Ag Method and Apparatus for Operating a Servo-Actuated Closing Device
GB2053513A (en) * 1979-07-04 1981-02-04 Rau Swf Autozubehoer Circuit arrangement for driving a movable element
DE3332813A1 (en) * 1983-09-12 1985-03-28 Küster & Co GmbH, 6332 Ehringshausen Method for initiating reversal of the direction of movement of an electromotively driven window pane in a motor vehicle and device for carrying out the method
WO1985001773A1 (en) * 1983-10-12 1985-04-25 Byrne & Davidson Industries Limited Obstruction detection means
EP0148318A1 (en) * 1983-12-22 1985-07-17 Helmut Hund K.G. Safety circuit for motor-driven window lift assemblies for automobile vehicles and similar vehicles
GB2169105A (en) * 1984-11-26 1986-07-02 Automatic Roller Doors Door or gate obstruction control

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269282A (en) * 1992-07-29 1994-02-02 Gen Electric Co Plc Controlling movement by electric motor using current monitoring
EP0595452A1 (en) * 1992-09-02 1994-05-04 Sumitomo Wiring Systems, Ltd. Control apparatus for power window
US5537013A (en) * 1992-09-02 1996-07-16 Sumitomo Wiring Systems, Ltd. Control apparatus for power window
GB2274671B (en) * 1993-01-14 1997-04-23 Eclipse Blinds Ltd Blind or curtain suspension system
GB2323941A (en) * 1994-02-28 1998-10-07 Ohi Seisakusho Co Ltd Controlling an opening/closing member, eg a vehicle window
GB2323941B (en) * 1994-02-28 1998-11-18 Ohi Seisakusho Co Ltd Drive control device for opening/closing member
GB2286906B (en) * 1994-02-28 1998-11-18 Ohi Seisakusho Co Ltd Drive control device for opening/closing member
EP1389817A1 (en) * 2002-07-26 2004-02-18 STMicroelectronics S.r.l. Method and circuit for detecting a torque variation of an electric DC motor
US6864654B1 (en) 2002-07-26 2005-03-08 Stmicroelectronics S.R.L. Method and relative circuit for detecting a torque variation of an electric DC motor
WO2008045624A1 (en) * 2006-10-10 2008-04-17 Square D Company Dc motor mechanical shock protection system
CN109700173A (en) * 2018-05-31 2019-05-03 乐歌人体工学科技股份有限公司 Same table control method

Also Published As

Publication number Publication date
GB8919794D0 (en) 1989-10-18

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)