CA2296455A1 - Device for detecting position - Google Patents
Device for detecting position Download PDFInfo
- Publication number
- CA2296455A1 CA2296455A1 CA 2296455 CA2296455A CA2296455A1 CA 2296455 A1 CA2296455 A1 CA 2296455A1 CA 2296455 CA2296455 CA 2296455 CA 2296455 A CA2296455 A CA 2296455A CA 2296455 A1 CA2296455 A1 CA 2296455A1
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- CA
- Canada
- Prior art keywords
- signal
- acoustic signal
- waveguide
- propagation
- travel path
- 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
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/14—Systems for determining distance or velocity not using reflection or reradiation using ultrasonic, sonic, or infrasonic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention relates to an apparatus for detecting the position of an object which can move along a predetermined path, comprising an acoustic signal waveguide which extends along the path and has a predetermined, uniform speed of propagation of sound, and a signal input coupler, which is located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler at one end of the acoustic signal waveguide and each being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the path to the other, and a large number of additional pulses in between.
Description
DEVICE FOR DETECTING POSITION
FIELD OF THE INVENTION
The invention relates to an apparatus for detecting the position of an object which can move along a predefined path. Such apparatus may be used for controlling the position of a lift cage or the like and thus ensuring its positioning at predetermined stops according to floor levels.
BACKGROUND OF THE INVENTION
European patent 0 694 792 discloses an apparatus of this type for detecting the position of a moveable object, which has an acoustic signal waveguide which extends along a travel path and has a predetermined, uniform speed of propagation of sound, and a signal input coupler, which is connected to a signal generator and is located on the moveable object, to couple an acoustic signal into the acoustic signal waveguide. In this case, signal output couplers are arranged at both ends of the acoustic signal waveguide and are each connected to a counter, the two counters being clocked by a clock generator and connected to a subtracter for the output signals from the two counters. The output signal from the subtracter, as a measure of the propagation-time difference of the acoustic signal coupled in from the point at which it is coupled in to the signal output couplers, can be processed by an evaluation unit to form a signal which is representative of the instantaneous position of the moveable object on the travel path, the signal input coupler operating with a signal spacing which is greater than the propagation time of sound from one end of the travel path to the other. In the case of very long travel paths, such as occur, for example, in lifts in multi-storey buildings, the lifts often also being operated at high speed, the distance resolution which can be achieved is inadequate, however.
FIELD OF THE INVENTION
The invention relates to an apparatus for detecting the position of an object which can move along a predefined path. Such apparatus may be used for controlling the position of a lift cage or the like and thus ensuring its positioning at predetermined stops according to floor levels.
BACKGROUND OF THE INVENTION
European patent 0 694 792 discloses an apparatus of this type for detecting the position of a moveable object, which has an acoustic signal waveguide which extends along a travel path and has a predetermined, uniform speed of propagation of sound, and a signal input coupler, which is connected to a signal generator and is located on the moveable object, to couple an acoustic signal into the acoustic signal waveguide. In this case, signal output couplers are arranged at both ends of the acoustic signal waveguide and are each connected to a counter, the two counters being clocked by a clock generator and connected to a subtracter for the output signals from the two counters. The output signal from the subtracter, as a measure of the propagation-time difference of the acoustic signal coupled in from the point at which it is coupled in to the signal output couplers, can be processed by an evaluation unit to form a signal which is representative of the instantaneous position of the moveable object on the travel path, the signal input coupler operating with a signal spacing which is greater than the propagation time of sound from one end of the travel path to the other. In the case of very long travel paths, such as occur, for example, in lifts in multi-storey buildings, the lifts often also being operated at high speed, the distance resolution which can be achieved is inadequate, however.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an apparatus for detecting the position of an object which can move along a predefined path, with which it is possible to monitor, simply and accurately, the position of the moveable object on a travel path of great length.
An apparatus for detecting the position of an object moveable along a predetermined travel path in accordance with the present invention comprises an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal that is representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the travel path to the other, and a large number of additional pulses inbetween.
Further objects, embodiments and advantages of the invention will become apparent from the following description and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail below with reference to a preferred embodiment illustrated schematically in the appended drawings.
It is an object of the invention to provide an apparatus for detecting the position of an object which can move along a predefined path, with which it is possible to monitor, simply and accurately, the position of the moveable object on a travel path of great length.
An apparatus for detecting the position of an object moveable along a predetermined travel path in accordance with the present invention comprises an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal that is representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the travel path to the other, and a large number of additional pulses inbetween.
Further objects, embodiments and advantages of the invention will become apparent from the following description and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail below with reference to a preferred embodiment illustrated schematically in the appended drawings.
Fig. 1 shows an apparatus for detecting position in schematic form in accordance with the invention.
Fig. 2 shows a timing diagram relating to the signals from the apparatus of Fig. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The illustrated apparatus for detecting position, which can be used in particular for detecting the position of a lift cage, comprises an acoustic signal waveguide 1, for example a steel rail or especially a metallic wire, which extends along a predefined travel path, along which a moveable object 2, for example a lift cage, can move to and fro. The acoustic signal waveguide 1, having a predetermined, uniform speed of propagation of sound, is clamped or held in a damped manner at both ends in a damping clamping means or holder 3.
The moveable object 2 carries a signal input coupler 4, which is connected to a signal generator 5, for example an oscillator, via a signal matching circuit 4'. The signal input coupler 4, which, in particular, operates inductively, couples an acoustic signal which periodically includes a synchronization pulse S received from the signal generator 5, into the acoustic signal waveguide 1. The synchronization pulses S have a clock period greater than the duration of the propagation of the acoustic signal from one end of the acoustic signal waveguide 1 to the other.
In addition, the signal input coupler 4 couples in additional pulses M, specifically a large number of additional pulses M during each clock period of the synchronization pulses S. The clock period of the additional pulses M is such that a distance resolution, needed for example for braking and for moving to an exact position of the object 2, is achieved in the direction of the travel path.
The synchronization pulses S are marked, that is to say can be distinguished from the additional pulses M during the evaluation. The marking can be made, for example, by their clock period being an appropriate multiple of the clock period of the additional pulses M, and additionally by their offset in time in relation to the additional pulses M, for example by one half clock period, cf. the pulse train generated by the signal generator 5 in the first line of Fig. 2. Then, a predetermined number of additional pulses M in each case follows a synchronization pulse S.
However, the marking can also be made in any other way, thus the synchronization pulses S can be distinguished from the additional pulses M by modulation, pulse width, pulse height or the like.
The synchronization and additional pulses S, M to be coupled in may be short electromagnetic pulses, for example simple pulses or pulse trains, or a periodic frequency shift.
A signal output coupler 6 is in each case arranged at the ends of the acoustic signal waveguide 1. This is preferably a piezoelectric signal output coupler 6, but those operating inductively or capacitively can also be used.
Each signal output coupler 6 is connected to a signal matching circuit 7, whose output lines in each case lead to a counter 8.
Both counters 8 are clocked by a clock generator 9, an oscillator. The clock period of the clock generator 9 is considerably lower than the propagation time of the sound from one end of the acoustic signal waveguide 1 to the other and is selected in accordance with the desired measurement-path resolution. The outputs from the counters 8 are fed to a subtracter 10, which forms the difference between the output signals from the counters 8 and feeds them to an evaluation unit 11, for example a microprocessor, where the output signal from the subtracter 10 is evaluated.
The synchronization pulses S are used to indicate to the evaluation unit 11 which following pairs of additional pulses belong to each other, namely the respective nth, that is to say first, second, third and so on, additional pulses M arriving at the two signal output couplers 6 (designated by A and B in Fig. 2) at different times Ta and Tb following the respective synchronization pulse S, in order that the evaluation unit 11 can detect or determine the associated absolute time difference Ta - Tb = OT
Fig. 2 shows a timing diagram relating to the signals from the apparatus of Fig. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The illustrated apparatus for detecting position, which can be used in particular for detecting the position of a lift cage, comprises an acoustic signal waveguide 1, for example a steel rail or especially a metallic wire, which extends along a predefined travel path, along which a moveable object 2, for example a lift cage, can move to and fro. The acoustic signal waveguide 1, having a predetermined, uniform speed of propagation of sound, is clamped or held in a damped manner at both ends in a damping clamping means or holder 3.
The moveable object 2 carries a signal input coupler 4, which is connected to a signal generator 5, for example an oscillator, via a signal matching circuit 4'. The signal input coupler 4, which, in particular, operates inductively, couples an acoustic signal which periodically includes a synchronization pulse S received from the signal generator 5, into the acoustic signal waveguide 1. The synchronization pulses S have a clock period greater than the duration of the propagation of the acoustic signal from one end of the acoustic signal waveguide 1 to the other.
In addition, the signal input coupler 4 couples in additional pulses M, specifically a large number of additional pulses M during each clock period of the synchronization pulses S. The clock period of the additional pulses M is such that a distance resolution, needed for example for braking and for moving to an exact position of the object 2, is achieved in the direction of the travel path.
The synchronization pulses S are marked, that is to say can be distinguished from the additional pulses M during the evaluation. The marking can be made, for example, by their clock period being an appropriate multiple of the clock period of the additional pulses M, and additionally by their offset in time in relation to the additional pulses M, for example by one half clock period, cf. the pulse train generated by the signal generator 5 in the first line of Fig. 2. Then, a predetermined number of additional pulses M in each case follows a synchronization pulse S.
However, the marking can also be made in any other way, thus the synchronization pulses S can be distinguished from the additional pulses M by modulation, pulse width, pulse height or the like.
The synchronization and additional pulses S, M to be coupled in may be short electromagnetic pulses, for example simple pulses or pulse trains, or a periodic frequency shift.
A signal output coupler 6 is in each case arranged at the ends of the acoustic signal waveguide 1. This is preferably a piezoelectric signal output coupler 6, but those operating inductively or capacitively can also be used.
Each signal output coupler 6 is connected to a signal matching circuit 7, whose output lines in each case lead to a counter 8.
Both counters 8 are clocked by a clock generator 9, an oscillator. The clock period of the clock generator 9 is considerably lower than the propagation time of the sound from one end of the acoustic signal waveguide 1 to the other and is selected in accordance with the desired measurement-path resolution. The outputs from the counters 8 are fed to a subtracter 10, which forms the difference between the output signals from the counters 8 and feeds them to an evaluation unit 11, for example a microprocessor, where the output signal from the subtracter 10 is evaluated.
The synchronization pulses S are used to indicate to the evaluation unit 11 which following pairs of additional pulses belong to each other, namely the respective nth, that is to say first, second, third and so on, additional pulses M arriving at the two signal output couplers 6 (designated by A and B in Fig. 2) at different times Ta and Tb following the respective synchronization pulse S, in order that the evaluation unit 11 can detect or determine the associated absolute time difference Ta - Tb = OT
between associated additional pulses M, and hence the position of the object 2.
The evaluation in order to detect the position is primarily carried out in relation to the additional signals M, however the synchronization pulses S can also be evaluated in this regard, specifically above all, but not exclusively, when the respective mth additional pulse is specially marked, in order in this way to serve as a synchronization pulse S.
If the moveable object 2 is located at the centre between the signal output couplers 6, the outputs from the counters 8 are equal and their difference is zero. If the object 2 (in the case of a vertical path) is above the centre, the output from the counter 8 connected to the upper signal output coupler 6 is smaller than that from the other. The propagation-time difference determined by the subtracter 10 between the mutually associated additional pulses M in the acoustic signal waveguide 1, and the known speed of sound in the latter, gives the distance of the moveable object 2 from the centre. Since, if the moveable object 2 were to be located below the centre, the difference would have a different sign, it is also known whether the moveable object 2 is located above or below the centre, that is to say the precise position of the moveable object 2 can therefore be calculated. A digital or analogue position signal produced in this way by the evaluation unit 11 can be used for subsequent control.
A watchdog 12 (monitor circuit) in the evaluation unit 11 can be used for the simple monitoring of the measurement path, given time-invariant input coupling of the signal coupled in. In the event of contamination which is capable of damping the signal on the acoustic signal waveguide 1, the difference determined by the subtracter 10 exceeds a predetermined value, to which the watchdog 12 responds in order to trigger an appropriate warning signal or the like.
The speed of sound in an acoustic signal waveguide 1 made of steel is about 5300 m/s. Given a time resolution of 188 ns, for which purpose a clock generator frequency of 5.3 MHz is necessary, the positional resolution of the measurement path is 1 mm.
Instead of being coupled to the signal generator 5, the signal input coupler 4 may be triggered by evaluation unit 11 to couple the acoustic signals into the signal waveguide 1. Instead it is also possible that the signal input coupler 4 triggers the evaluation unit 11 via an electric signal to define the temporal start of each coupling of an acoustic signal into the signal waveguide 1 for the evaluation to be done by the evaluation unit 11.
Instead of the preferred provision of a signal output coupler 6 at each of the two ends of the signal waveguide 1, only one signal output coupler 6 provided at one of the ends of the signal waveguide 1 may be used.
While the invention has been shown and described with reference to a preferred embodiment, it should be apparent to one of ordinary skill in the art that many changes and modifications may be made without departing from the spirit and scope of the invention as defined in the claims.
The evaluation in order to detect the position is primarily carried out in relation to the additional signals M, however the synchronization pulses S can also be evaluated in this regard, specifically above all, but not exclusively, when the respective mth additional pulse is specially marked, in order in this way to serve as a synchronization pulse S.
If the moveable object 2 is located at the centre between the signal output couplers 6, the outputs from the counters 8 are equal and their difference is zero. If the object 2 (in the case of a vertical path) is above the centre, the output from the counter 8 connected to the upper signal output coupler 6 is smaller than that from the other. The propagation-time difference determined by the subtracter 10 between the mutually associated additional pulses M in the acoustic signal waveguide 1, and the known speed of sound in the latter, gives the distance of the moveable object 2 from the centre. Since, if the moveable object 2 were to be located below the centre, the difference would have a different sign, it is also known whether the moveable object 2 is located above or below the centre, that is to say the precise position of the moveable object 2 can therefore be calculated. A digital or analogue position signal produced in this way by the evaluation unit 11 can be used for subsequent control.
A watchdog 12 (monitor circuit) in the evaluation unit 11 can be used for the simple monitoring of the measurement path, given time-invariant input coupling of the signal coupled in. In the event of contamination which is capable of damping the signal on the acoustic signal waveguide 1, the difference determined by the subtracter 10 exceeds a predetermined value, to which the watchdog 12 responds in order to trigger an appropriate warning signal or the like.
The speed of sound in an acoustic signal waveguide 1 made of steel is about 5300 m/s. Given a time resolution of 188 ns, for which purpose a clock generator frequency of 5.3 MHz is necessary, the positional resolution of the measurement path is 1 mm.
Instead of being coupled to the signal generator 5, the signal input coupler 4 may be triggered by evaluation unit 11 to couple the acoustic signals into the signal waveguide 1. Instead it is also possible that the signal input coupler 4 triggers the evaluation unit 11 via an electric signal to define the temporal start of each coupling of an acoustic signal into the signal waveguide 1 for the evaluation to be done by the evaluation unit 11.
Instead of the preferred provision of a signal output coupler 6 at each of the two ends of the signal waveguide 1, only one signal output coupler 6 provided at one of the ends of the signal waveguide 1 may be used.
While the invention has been shown and described with reference to a preferred embodiment, it should be apparent to one of ordinary skill in the art that many changes and modifications may be made without departing from the spirit and scope of the invention as defined in the claims.
Claims (17)
1. An apparatus for detecting the position of an object moveable along a predetermined travel path, comprising:
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the travel path to the other, and a large number of additional pulses in between.
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the travel path to the other, and a large number of additional pulses in between.
2. The apparatus of claim 1, wherein the synchronization pulses are marked with respect to the additional pulses.
3. The apparatus of Claim 2, wherein the clock of the synchronization pulses is offset in time with respect to that of the additional pulses.
4. The apparatus of Claim 1, wherein the synchronization pulses and the additional pulses are fed to the evaluation unit to determine the propagation-time difference.
5. The apparatus of Claim 1, wherein a counter connected with the signal output coupler is clocked by a clock generator.
6. The apparatus of claim 1, wherein at each end of the signal waveguide a signal output coupler is provided, each of which being connected to a counter, said counters being connected to a subtracter for the output signals from the two counters.
7. The apparatus of Claim 5, wherein the clock generator for the counter operates at the minimum frequency necessary for an envisaged measurement-path resolution.
8. The apparatus of Claim 1, wherein the signal output coupler is a piezoelectric output coupler.
9. The apparatus of Claim 1, wherein the signal output coupler is a capacitive output coupler.
10. The apparatus of Claim 1, wherein the signal output coupler is an inductive output coupler.
11. The apparatus of Claim 1, wherein the acoustic signal waveguide is a metallic element extending along the travel path.
12. The apparatus of Claim 11, wherein the acoustic signal waveguide is a metal rail.
13. The apparatus of Claim 11, wherein the acoustic signal waveguide is a wire.
14. The apparatus of Claim 1, wherein the signal input coupler is an inductive input coupler.
15. The apparatus of Claim 1, wherein the moveable object is a lift cage.
16. An apparatus for detecting the position of an object moveable along a predetermined travel path, comprising:
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler connected to a signal generator and located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, signal output couplers being arranged at both ends of the acoustic signal waveguide and each being connected to a counter, the two counters being connected to an evaluation unit for determining the propagation-time difference of the sound signal coupled in from a position at which it is coupled in to the signal output couplers and for generating a signal that is representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the travel path to the other, and a large number of additional pulses inbetween.
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler connected to a signal generator and located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, signal output couplers being arranged at both ends of the acoustic signal waveguide and each being connected to a counter, the two counters being connected to an evaluation unit for determining the propagation-time difference of the sound signal coupled in from a position at which it is coupled in to the signal output couplers and for generating a signal that is representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, synchronization pulses with a clock period which is greater than the time of propagation of sound from one end of the travel path to the other, and a large number of additional pulses inbetween.
17. The apparatus of Claim 16, wherein the evaluation unit includes a monitor circuit which triggers a warning signal if the difference detected by the subtracter exceeds a predetermined value.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999103646 DE19903646C1 (en) | 1999-01-29 | 1999-01-29 | Arrangement for position detection has sound signal line, couples in synchronization pulses with clock time greater than sound transition time and marked with respect to intermediate auxiliary pulses |
| DE19903646.2 | 1999-01-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2296455A1 true CA2296455A1 (en) | 2000-07-29 |
Family
ID=7895847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2296455 Abandoned CA2296455A1 (en) | 1999-01-29 | 2000-01-20 | Device for detecting position |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1024373A1 (en) |
| JP (1) | JP2000221258A (en) |
| CN (1) | CN1264045A (en) |
| BR (1) | BR0000218A (en) |
| CA (1) | CA2296455A1 (en) |
| DE (1) | DE19903646C1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19929984C1 (en) * | 1999-06-30 | 2000-10-26 | Schmersal K A Gmbh & Co | Position detection device for elevator cabin uses evaluation of signal coupled to signal line extending along elevator shaft via periodically triggered signal coupler attached to elevator cabin |
| JP4277878B2 (en) * | 2006-07-07 | 2009-06-10 | 株式会社日立製作所 | Multi car elevator |
| JP4940895B2 (en) * | 2006-10-31 | 2012-05-30 | 株式会社日立製作所 | Elevator |
| CN112938673B (en) * | 2021-02-20 | 2022-04-01 | 上海吉盛网络技术有限公司 | Method for displaying elevator movement by continuous image using uninterrupted position data |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5937459A (en) * | 1982-08-27 | 1984-02-29 | Automob Antipollut & Saf Res Center | Body detector by ultrasonic wave |
| DE4229079A1 (en) * | 1992-09-01 | 1994-03-03 | Vega Grieshaber Gmbh & Co | Pulse echo distance measuring system, e.g. for filling level monitor - uses transmitted signal comprising discrete pulse packets with individual evaluation of received signal echo components |
| DE4426793C1 (en) * | 1994-07-28 | 1995-10-26 | Schmersal K A Gmbh & Co | Position measurement appts. for e.g. elevator or lift shaft |
-
1999
- 1999-01-29 DE DE1999103646 patent/DE19903646C1/en not_active Expired - Fee Related
-
2000
- 2000-01-19 EP EP00100976A patent/EP1024373A1/en not_active Withdrawn
- 2000-01-20 JP JP2000011366A patent/JP2000221258A/en active Pending
- 2000-01-20 CA CA 2296455 patent/CA2296455A1/en not_active Abandoned
- 2000-01-27 CN CN 00101682 patent/CN1264045A/en active Pending
- 2000-01-28 BR BR0000218-6A patent/BR0000218A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE19903646C1 (en) | 2000-07-06 |
| BR0000218A (en) | 2000-09-26 |
| JP2000221258A (en) | 2000-08-11 |
| EP1024373A1 (en) | 2000-08-02 |
| CN1264045A (en) | 2000-08-23 |
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