GB2221769A - Improvements in electric motor control - Google Patents
Improvements in electric motor control Download PDFInfo
- Publication number
- GB2221769A GB2221769A GB8818847A GB8818847A GB2221769A GB 2221769 A GB2221769 A GB 2221769A GB 8818847 A GB8818847 A GB 8818847A GB 8818847 A GB8818847 A GB 8818847A GB 2221769 A GB2221769 A GB 2221769A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electric motor
- motor
- control system
- pulses
- window
- 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- Withdrawn
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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37317—Derive position from current, voltage, back electromotive force bemf
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37486—Resolver emits pulses at zerocrossings, counter
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45242—Door, panel, window operation, opening, closing
Landscapes
- Power-Operated Mechanisms For Wings (AREA)
- Window Of Vehicle (AREA)
Abstract
An electric windowlift system is disclosed in which a window 22 is moveable between an open position and a closed position by an electric motor 11 and associated actuator mechanism 19. A control system 10 for the electric motor 11 monitors the back electromotive force pulses generated by the electric motor 11 and uses this information to produce signals indicative of window position and speed. If the control system 10 senses that the window speed has dropped to zero while the window 22 is being closed it acts so as to switch off the electric motor 11. Serious injury to vehicle passengers by the entrapment of one of their limbs is thereby prevented. <IMAGE>
Description
IMPROVEMENTS IN ELECTRIC MOTOR CONTROL
This invention relates to the control of an electric motor and in particular to a method of determining the angular position and rotational speedy of such a motor in an open loop manner when used as the motive source for a power windowlift system on an automobile.
Conventional windowlift systems use a simple changeover switch as the means of control in which the operator has to hold the changeover switch in either an up or tiown position to move the window in the required direction.
If the operator requires to completely open or close the window then the changeover switch has to be held in the desired position until the operation is completed which can take ten or more seconds.
It is s therefore desirable to use a so called 'one touch' system in which the operator merely has to flick a switch in the desired direction to cause full opening or closing of the window.
This type of system has the advantage ttiat in the ariver's case concentration on driving the vehicle is not interrupted for a very long period of time.
It is however a problem with such systems that safety means must be provided to allow for the possibility of a limb or neck of a person being trapped in the aperture between the closing window and the top ofthe door frame.
It is known to provide in such one shot systems circuitry to switch off the motor if the torque exceeds a pre-determinea value but such systems have the disadvantage that although upward movement of the window is stopped the limb or neck remains compressed until the operator actuates the control switch to lower the window. Such entrapment is painful and can be dangerous in the case of a persons neck because the pre-determined torque has to be set to a relatively hign value to allow for friction in the system and the force needed to urge the window into contact with its seal.
It is an object of this invention to provide a cheap and simple method of controlling an electric motor for use in such systems.
According to a first aspect of the invention there is provided a method of measuring the rotational position of an electric motor having a rotor and a stator by counting the back electromotive force pulses generated by rotation of the rotor relative to the stator when the motor is energised and converting these counted pulses into a rotational position by using the relationship between the number of pulses counted and the number of pulses expected per revolution of the rotor.
This has the advantage that the rotational position of the electric motor can be measured cheaply and without modification to the motor itself.
According to a second aspect of the invention there is provided an electric motor control system for controlling an electric motor having a rotor and a stator, the control system including:an operator controlled input means to supply a siynal indicative of the required motor state; means to sense back electromotive force pulses produced Dy the electric motor; counter means to count said pulses; convertor means to transform said pulses into a signal indicative of rotor position and a motor controller to selectively connect the motor to a source of electric potential in a pre-aetermined manner in response to the signals received from the convertor means and input means.
According to a third aspect of the invention there is provided an electric windowlift system comprising an electric motor controlled by a control system, a window moveable between a fully open position and a fully closed position, an actuator mechanism powered by sai a electric motor to selectively move said window and an operator actuated switch to provide input signals indicative of a desired window position wherein the control system has means to sense back electromotive forces pulses generated by the electric motor, a counter to count said pulses, a convertor to convert said countea pulses into signals indicative of rotational position and speed and an electric motor controller to selectively energise the electric motor in a pre-determined manner in response to the signals received from the convertor and the switch, the control system being arranged to override an input signal from the switch to close the window by switching off the electric motor wnen the speed of the motor is sensed to have dropped to zero while-the window is in a partly closed position.
Preferably, before the control system switches off the electric motor it momentarily reverses the direction ot rotation of the motor.
The invention will now described by way of example with reference to the accompanying drawing of which:
Figure 1 is a block diagram of an electric motor control
system according to a first aspect of the invention;
Figure 2 is a schematic sketch of a one shot windowlift
system according to a second aspect of the
invention using a motor control system according to
the first aspect of the invention.
With reference to the drawing there is shown a motor control means 12, a high pass filter 13 a logic controller 16, an impulse generator 17 and a low pass filter 18 which in combination form an open loop electric motor control system 10 for a direct current electric motor 11.
With particular reference to Figure 2 there is shown a one shot windowlift system having a source ot motive power in the form of the motor 11 which is controlled by the electric motor control system 10.
A window 22 is moveable vertically by means of a mechanical actuator 19 within the confines of a window frame 21 between a fully opened position 'A' and a fully closed position 'C' in response to an operator moving a switch 23.
Operation of the electric motor control system is as follows:
When a potential difference is applied to the motor 11 a back electromotive force is produced. This back electromotive force is approximately sinusoidal in waveform and has a frequency proportional to the rotation speea of the motor 11. The actual frequency of the back electromotive force for any' rotational speed will aepend upon the number of poles that the electric motor 11 has.
The voltage across the motor 11 is measurea by means of tne voltage drop across a known resistor 'R' inserted into one of the supply lines to the motor 11.
The resultant value of voltage is passed through the high pass filter 13 to remove the direct current supply component and leave just an alternating voltage indicative of the bacK electromotive force produced by the motor 11.
The output from the high pass filter is then supplied to a zero cross detector 14 which senses changes in polarity ana provide a square wave signal indicative of these changes in polarity to the counter 15 and to the impulse generator 17.
The counter 15 merely counts the number of square wave pulses received from the zero cross detector 14 ana supplies a signal indicative of this value of rotation to the logic controller 16.
The impulse generator 17 receives the square wave pulses from the zero cross detector 14 and converts them into pulses of the same frequency as supplied to it Dy the zero cross detector but of very short duration.
The short duration pulses from the impulse generator 17 are supplied to the low pass filter 18 which converts them into a voltage signal of magnitude proportional to rotational speed.
The output voltage signal from the low pass tilter 18 is then sent to the logic controller 16 to form a rotational speed input.
The logic controller 16 analyses the signals receivea from the low pass filter 18 and the counter 15 to determine whether the motor 11 is to be switched on or off or its direction of rotation is to be reversed and sends a signal indicative of this decision to the motor control means 12.
The actual logical decisions taken by the logic controller 16 will depend on the actual application and so will be described with particular reference to the one shot windowlift system shown in Figure 2.
Operation of the one shot windowlift system is as follows: by moving the switch 23 to a position D and then releasing it, or maintaining it in that position, the window 22 will be moved to its fully open position 'A' by the mechanical actuator 19 and the motor 11, whereas, movement of the switch 23 to a position 'us' and then releasing it, or maintaining it in that position, will cause the window 22 to be moved to its fully closed position 'C'.
As soon as the rotor of the motor 11 starts to rotate the logic controller 16 which forms part of the control system 10 starts counting the number of back electromotive force pulses and converts these into equivalent motor speea aria angular rotation values.
The ratio between rotation of the motor 11 ana vertical displacement of the window 22 is a fixed ratio, so that by measuring the number of rotations or part rotations of tne rotor of the motor 11 the vertical position of the window 22 can be computed at any instant in time.
The logic in the logic controller 16 is programmed such that if the computated position of the window. 22 lies between position 'A' and position 'B' with the window 22 shutting and the measured speed drops to zero then the logic controller 16 sends a signal to the motor controller 12 to reverse the motor 11 to re-open the window 22 a specified amount, it being presumed that an obstruction has been encountered.
If however, the computed position of the winnow 22 lies between position 'B' and position 'C' with the window shutting and the measured speed drops to zero then the logic controller 16 sends a signal to the motor controller 12 to switch off the supply to the motor 11 ana does not try to re-open the window 22 it being presumed that the window 22 has reached the closed position 'C'.
A non-volatile memory device is used to store the current position of the window 22 and the current direction of motion so that the vehicle battery can be disconnected without upsetting the operation of the windowlift system.
The counter 15 is arranged to count up and down by supplying a signal indicative of direction of rotation of the motor 11 which is obtained by sensing the polarity of the supply to the motor 11 and sending a signal indicative of this measurement to the counter 15
Although, this invention has been described by way of example to a windowlift system it may similarly be used in any electric motor powered mechanism where an approximate position of an element needs to be known for example electrically powered doors or electrically powered sunroofs.
Similarly, the invention is not limited to the electronic circuitry described herein other methods of converting the back electromotive force into signals indicative of rotational position or rotational speed coula be used.
Additionally, although the invention has been described in relation to a system in which control action occurs when the rotational speed reaches zero it should be appreciated that control action could be initiated at any pre-determinea speed if required.
The term rotational position is intended to cover not only partial revolution of the rotor but also a plurality of revolutions.
Claims (16)
1. A method of measuring the rotational position ot an electric motor having a rotor and a stator by counting
the back electromotive force pulses generated by
rotation of the rotor relative to the stator when the
motor is energised and converting these counted pulses
into a rotational position by using the relationship
between the number of pulses counted and the number of
pulses expected per revolution of the rotor.
2. A method as claimed in claim 1 in which the number of
pulses per unit time is used to provide a signal
indicative of rotational velocity.
3. A method as claimed in claim 1 or in claim 2 in which
the method incluaes the step of measuring the potential
applied to the motor.
4. A method as claimed in claim 3 in which tne method
includes the step of passing the measured signal of
applied voltage through a high pass filter to remove
any direct current components.
5. A method as claimed in claim 4 in which the method
includes the step of counting the pulses present in the
filtered signal.
6. A method of measuring the rotational position of an
electric motor substantially as described herein with
reference to the accompanying drawing.
7. An electric motor control system for controlling an
electric motor having a rotor and a stator, the control
system including:
an operator controlled input means to supply a signal
indicative of the required motor state;
means to sense back electromotive force pulses produced
by the electric motor;
counter means to count saia pulses;
convertor means to transform said pulses into a signal
indicative of rotor position and a motor controller to
selectively connect the motor to a source of electric
potential in a pre-determined manner in response to the
signals received from the convertor means and input
means.
8. An electric motor control system as claimed in claim 7
in which the system further comprises means to change
said pulses into a signal indicative of rotational
speed.
9. An electric motor control system as claimed in claim 7
or in claim 8 in which the input means is a switch.
10. An electric motor control system as claimed in any of
claims 7 to 9 in which a resistor of low but known
resistance is interposed between the motor ana the
source of electric potential thereby facilitating 'the
measurement of the voltage supplied to the motor.
11. An electric motor control system as claimed in claim 10
in which a filter is provided to remove the component
of voltage supplied from the source of electric
potential to leave just the component due to the back
electromotive force.
12. An electric motor control system as claimed in claim 11
in which the motor is a direct current motor and the
filter is a high pass filter.
13. An electric motor control system substantially as
described herein with reference to the accompanying
drawing.
14. An electric windowlift system comprising an electric
motor controlled by a control system, a window moveable
between a fully open position and a fully closed
position, an actuator mechanism powdered by said
electric motor to selectively move said window and an
operator actuated switch to provide input signals
indicative of a desired window position wherein the
control system has means to sense back electromotive
forces pulses generated by the electric motor, a
counter to count said pulses, a convertor to convert
said counted pulses into signals indicative of
rotational position and speea and an electric motor
controller to selectively energise the electric motor
in a pre-determined manner in response to the signals
received from the convertor and the switch, the control
system being arranged to overriae an input siynal from
the switch to close the window by switching off the
electric motor when the speed of the motor is sensea to
have dropped to zero while the window is in a partly
closed position.
15. A windowlift system as claimed in claim 12 wherein
before the control system switches off the motor it
momentarily reverses the direction of rotation of the
motor.
16. A windowlift system substantially as described herein
with reference to the accompanying drawings.
0582B
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8818847A GB2221769A (en) | 1988-08-09 | 1988-08-09 | Improvements in electric motor control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8818847A GB2221769A (en) | 1988-08-09 | 1988-08-09 | Improvements in electric motor control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8818847D0 GB8818847D0 (en) | 1988-09-14 |
| GB2221769A true GB2221769A (en) | 1990-02-14 |
Family
ID=10641806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8818847A Withdrawn GB2221769A (en) | 1988-08-09 | 1988-08-09 | Improvements in electric motor control |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2221769A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2267161A (en) * | 1992-05-23 | 1993-11-24 | Koito Mfg Co Ltd | Vehicle power window safety device |
| GB2269568A (en) * | 1992-08-10 | 1994-02-16 | Lansing Linde Ltd | Electrically powered device, eg vehicle with on-demand power steering. |
| EP0744679A1 (en) * | 1995-05-22 | 1996-11-27 | Faiveley Transport | Door opening and/or closing electronic control method and means therefor |
| EP0714052A3 (en) * | 1994-11-26 | 1997-05-28 | Telefunken Microelectron | Method for monitoring the opening and closing process in a system with at least one electric motor driven part |
| EP0784146A1 (en) * | 1996-01-12 | 1997-07-16 | Somfy | Motorised closure or solar protection installation |
| GB2317058A (en) * | 1996-09-06 | 1998-03-11 | Draftex Ind Ltd | Superimposed variations on back emf sensing angular position |
| EP1162523A2 (en) * | 2000-06-06 | 2001-12-12 | Meritor Light Vehicle Technology, LLC | Method and apparatus for determining motor rotation in a power window system or the like |
| WO2001094733A1 (en) * | 2000-06-06 | 2001-12-13 | Leopold Kostal Gmbh & Co. Kg | Method for determining the rotational position of the drive shaft of a direct current motor |
| FR2822605A1 (en) * | 2001-03-23 | 2002-09-27 | Meritor Light Vehicle Sys Ltd | Determination of the position of the shaft of an electric motor, senses e.m.f. generated in operating relay coils and motor winding passes to generate signal that is processed to determine rotor position and speed |
| WO2004104667A1 (en) * | 2003-05-22 | 2004-12-02 | Koninklijke Philips Electronics N.V. | Distance measurement in motor-driven focusing systems |
| WO2007039198A1 (en) * | 2005-10-06 | 2007-04-12 | Brose Fahrzeugteile Gmbh & Co. Kg, Coburg | Control device of an adjusting mechanism of a motor vehicle |
| WO2017077461A1 (en) * | 2015-11-06 | 2017-05-11 | Automotive Lighting Italia S.P.A | Anti-pinch circuit device for an apparaturs for auomatic movement of sliding windows in a motor vehicle, and corresponding method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4234833A (en) * | 1978-01-19 | 1980-11-18 | A. E. Moore Company, Inc. | Door operator system using counter circuit for determining limit positions |
| GB2055487A (en) * | 1979-07-06 | 1981-03-04 | Jaeger | An adder of electrical pulses using an electric motor with position control |
| GB2060944A (en) * | 1979-10-12 | 1981-05-07 | Itt | Power-operated seat-adjusting apparatus for vehicles |
| EP0047812A2 (en) * | 1980-09-11 | 1982-03-24 | Leopold Kostal GmbH & Co. KG | Method for the electronic actuation and surveillance of the opening and closing cycle of electrically actuated units, such as window winders and electric sliding roofs, especially for motor vehicles, and an electrical-circuit arrangement for carrying out this method |
| GB2169107A (en) * | 1984-12-29 | 1986-07-02 | Yoshida Kogyo Kk | Control system for an automatic door |
| EP0213992A1 (en) * | 1985-07-18 | 1987-03-11 | Jaeger | Method and device to control a DC motor |
| GB2198860A (en) * | 1986-10-03 | 1988-06-22 | Jidosha Denki Kogyo Kk | An automatic opening and closing device for an automobile window |
-
1988
- 1988-08-09 GB GB8818847A patent/GB2221769A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4234833A (en) * | 1978-01-19 | 1980-11-18 | A. E. Moore Company, Inc. | Door operator system using counter circuit for determining limit positions |
| GB2055487A (en) * | 1979-07-06 | 1981-03-04 | Jaeger | An adder of electrical pulses using an electric motor with position control |
| GB2060944A (en) * | 1979-10-12 | 1981-05-07 | Itt | Power-operated seat-adjusting apparatus for vehicles |
| EP0047812A2 (en) * | 1980-09-11 | 1982-03-24 | Leopold Kostal GmbH & Co. KG | Method for the electronic actuation and surveillance of the opening and closing cycle of electrically actuated units, such as window winders and electric sliding roofs, especially for motor vehicles, and an electrical-circuit arrangement for carrying out this method |
| GB2169107A (en) * | 1984-12-29 | 1986-07-02 | Yoshida Kogyo Kk | Control system for an automatic door |
| EP0213992A1 (en) * | 1985-07-18 | 1987-03-11 | Jaeger | Method and device to control a DC motor |
| GB2198860A (en) * | 1986-10-03 | 1988-06-22 | Jidosha Denki Kogyo Kk | An automatic opening and closing device for an automobile window |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5422551A (en) * | 1992-05-23 | 1995-06-06 | Koito Manufacturing Co., Ltd. | Safety device and method for power window |
| GB2267161B (en) * | 1992-05-23 | 1995-09-27 | Koito Mfg Co Ltd | Safety device and method for power window |
| GB2267161A (en) * | 1992-05-23 | 1993-11-24 | Koito Mfg Co Ltd | Vehicle power window safety device |
| GB2269568A (en) * | 1992-08-10 | 1994-02-16 | Lansing Linde Ltd | Electrically powered device, eg vehicle with on-demand power steering. |
| EP0714052A3 (en) * | 1994-11-26 | 1997-05-28 | Telefunken Microelectron | Method for monitoring the opening and closing process in a system with at least one electric motor driven part |
| US5838126A (en) * | 1995-05-22 | 1998-11-17 | Faiveley Transport | Method and apparatus for opening or closing a door by measuring the instantaneous voltage and current in an associated motor |
| EP0744679A1 (en) * | 1995-05-22 | 1996-11-27 | Faiveley Transport | Door opening and/or closing electronic control method and means therefor |
| FR2734598A1 (en) * | 1995-05-22 | 1996-11-29 | Faiveley Transport | METHOD FOR ELECTRONIC CONTROL OF OPENING AND / OR CLOSING A DOOR AND DEVICE FOR IMPLEMENTING IT |
| EP0784146A1 (en) * | 1996-01-12 | 1997-07-16 | Somfy | Motorised closure or solar protection installation |
| FR2743602A1 (en) * | 1996-01-12 | 1997-07-18 | Somfy | MOTORIZED CLOSURE OR SUN PROTECTION INSTALLATION |
| GB2317058A (en) * | 1996-09-06 | 1998-03-11 | Draftex Ind Ltd | Superimposed variations on back emf sensing angular position |
| GB2317058B (en) * | 1996-09-06 | 2000-07-05 | Draftex Ind Ltd | Electric motors |
| EP1162523A3 (en) * | 2000-06-06 | 2003-10-29 | Meritor Light Vehicle Technology, LLC | Method and apparatus for determining motor rotation in a power window system or the like |
| EP1162523A2 (en) * | 2000-06-06 | 2001-12-12 | Meritor Light Vehicle Technology, LLC | Method and apparatus for determining motor rotation in a power window system or the like |
| WO2001094733A1 (en) * | 2000-06-06 | 2001-12-13 | Leopold Kostal Gmbh & Co. Kg | Method for determining the rotational position of the drive shaft of a direct current motor |
| FR2822605A1 (en) * | 2001-03-23 | 2002-09-27 | Meritor Light Vehicle Sys Ltd | Determination of the position of the shaft of an electric motor, senses e.m.f. generated in operating relay coils and motor winding passes to generate signal that is processed to determine rotor position and speed |
| WO2004104667A1 (en) * | 2003-05-22 | 2004-12-02 | Koninklijke Philips Electronics N.V. | Distance measurement in motor-driven focusing systems |
| WO2007039198A1 (en) * | 2005-10-06 | 2007-04-12 | Brose Fahrzeugteile Gmbh & Co. Kg, Coburg | Control device of an adjusting mechanism of a motor vehicle |
| US8068960B2 (en) | 2005-10-06 | 2011-11-29 | Brose Fahrzeugteile Gmbh & Co Kg, Coburg | Control device of an adjustment apparatus of a motor vehicle |
| WO2017077461A1 (en) * | 2015-11-06 | 2017-05-11 | Automotive Lighting Italia S.P.A | Anti-pinch circuit device for an apparaturs for auomatic movement of sliding windows in a motor vehicle, and corresponding method |
| CN108350717A (en) * | 2015-11-06 | 2018-07-31 | 汽车照明意大利独资股份有限公司 | It is suitable for use in the anti-clamp circuit equipment for the device for automatically moving sliding vehicle window in the motor vehicle and corresponding method |
| CN108350717B (en) * | 2015-11-06 | 2020-09-15 | 汽车照明意大利独资股份有限公司 | Anti-trap circuit arrangement for a device for automatically moving a sliding window in a motor vehicle and corresponding method |
| US10851576B2 (en) | 2015-11-06 | 2020-12-01 | Automotive Lighting Italia S.P.A. | Anti-pinch circuit device for an apparatus for automatic movement of sliding windows in a motor vehicle, and corresponding method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8818847D0 (en) | 1988-09-14 |
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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) |