A method for testing the speed of an elevator against disturbances and an elevator system

Abstract

The application belongs to the field of elevators, and discloses an anti-interference test method for elevator speed, which specifically comprises the following steps: step 1: receiving a transmission mark transmitted by a transmission end and starting a timer; the transmission mark is generated after the transmission end transmits a pulse light signal; step 2: judging whether a receiving mark sent by a receiving end is received within the timing period of the timer, if yes, proceeding to step 3, and if no, judging that the transmission end is blocked; the receiving mark is generated after the receiving end receives the pulse light signal; step 3: judging whether the receiving mark is sent by the receiving end corresponding to the transmission end in step 1, if yes, judging that the pulse light signal transmitted by the transmission end is received by the corresponding receiving end, and if no, judging that the receiving mark is an invalid mark and determining that the transmission end is blocked. The method adopts pulse light signals, two transmission ends alternately transmit, and a timer is combined with the signals of the transmission end and the receiving end to judge the time accurately, so that the detection precision is improved. Meanwhile, the application also discloses an elevator system adopting the method.

Description

Technical Field

[0001] This invention relates to the field of elevators, specifically to an anti-interference test method for elevator speed and an elevator system. Background Technology

[0002] CN209297576U discloses a dual-reflection photoelectric gate speed detector, including a photoelectric gate, a reflective panel, a display, an input keyboard, and a speed measuring circuit board. The photoelectric gate comprises two sets of reflective infrared emitting and receiving integrated tubes, which are mounted on the same horizontal line and a certain distance apart. The reflective panel has a rough white paper attached to its surface and is mounted on a moving object. A microprocessor in the speed measuring circuit board outputs the calculated speed value to the display. The short distance between the two sets of reflective infrared emitting and receiving integrated tubes allows the calculated average speed to approximate the instantaneous speed. Because the infrared emitting and receiving integrated tubes are reflective, the photoelectric gate does not need to be installed on either side of the object's moving track, and its installation is not limited by the width of the moving object.

[0003] CN206569860U discloses an elevator LCD display with dual-channel sensing for floor reset, comprising: an LCD display for displaying elevator floor information disposed inside the elevator car; a magnetic shielding plate and a reset device disposed in the elevator shaft; the magnetic shielding plate comprises several units, each disposed in the corresponding elevator shaft of each floor; the reset device is disposed in the corresponding elevator shaft of the common floors; and a dual-channel sensor, which is a photoelectric sensor with one upper and one lower channel, disposed outside the elevator car, and sensing and cooperating with the magnetic shielding plate and the reset device in the elevator shaft; the dual-channel sensor is connected to the LCD display inside the elevator car.

[0004] It is evident that using dual-channel sensors / optical transmitters and receivers to calculate speed is quite common.

[0005] In the existing technology, there is a practical difficulty in using the above solution in elevator shafts: dual transmitters are prone to interference.

[0006] The technical problem this case addresses is: how to reduce interference and improve speed detection accuracy. Summary of the Invention

[0007] The purpose of this invention is to provide an anti-interference test method for elevator speed. This method uses pulsed light signals, which are transmitted alternately by two transmitters. At the same time, a timer is used to combine the signals from the transmitter and receiver for accurate timing, thereby improving detection accuracy.

[0008] In addition, the present invention also discloses an elevator system employing this method.

[0009] To achieve the above objectives, the present invention provides the following technical solution: an anti-interference testing method for elevator speed, the method involving a dual photoelectric speed measuring device installed on an elevator; the dual photoelectric speed measuring device has a U-shaped structure, with two transmitting ends arranged side by side at one end of the U-shaped structure, and two receiving ends arranged at the other end of the U-shaped structure, one receiving end facing one transmitting end; the elevator shaft is provided with several baffles arranged sequentially from top to bottom, and during elevator operation, the baffles pass through the grooves of the U-shaped structure; both transmitting ends emit pulsed light signals; the two transmitting ends alternately emit pulsed light signals;

[0010] The method is specifically as follows:

[0011] Step 1: Receive the transmission marker transmitted by the transmitter and start the timer; the transmission marker is generated by the transmitter transmitting a pulsed light signal;

[0012] Step 2: Determine whether a receive flag is received from the receiver within the timer's timing period. If yes, proceed to Step 3; otherwise, determine that the transmitter is blocked. The receive flag is generated by the receiver after receiving the pulse light signal.

[0013] Step 3: Determine whether the receiving mark was sent by the receiving end corresponding to the transmitting end in Step 1. If yes, determine that the pulse light signal emitted by the transmitting end has been received by the corresponding receiving end; if no, determine that the receiving mark is invalid and assume that the transmitting end is blocked.

[0014] The above-mentioned method for testing the anti-interference of elevator speed also includes step 4: calculating the time difference between the two transmitters being blocked one after the other by using a timer, and calculating the instantaneous speed of the elevator, wherein the time difference is N timing cycles; and N is a positive integer greater than or equal to 1.

[0015] The above-mentioned method for testing the anti-interference of elevator speed also includes step 5: determining the direction of elevator movement based on the order in which the two transmitters are blocked.

[0016] In the above-mentioned anti-interference test method for elevator speed, the interrupt priority of the timer is higher than the interrupt priority of the receiver, and the interrupt priority of the receiver is higher than the interrupt priority of the transmitter.

[0017] In the above-mentioned anti-interference test method for elevator speed, a convex lens is provided before the transmitter and between the receiver. The convex lens is used to convert the pulse light signal emitted by the transmitter into a horizontal light signal and to gather the horizontal light signal to the receiver.

[0018] In the above-mentioned anti-interference test method for elevator speed, the duty cycle of the pulsed optical signal is less than 10%; preferably less than 5%; preferably less than 3%; and preferably less than 2%.

[0019] In the above-mentioned anti-interference test method for elevator speed, the duration of the pulsed light signal is 1-5 μs.

[0020] In the above-mentioned anti-interference test method for elevator speed, the timing period of the timer is the time interval between the two transmitting ends emitting pulse light signals;

[0021] The transmitter determines the transmission time of the pulsed light signal based on the timing of the timer.

[0022] Meanwhile, the present invention also discloses an elevator system, including a controller, wherein a dual photoelectric speed detector is installed on the elevator; the dual photoelectric speed detector has a U-shaped structure, with two transmitting ends arranged side by side at one end of the U-shaped structure, and two receiving ends arranged at the other end of the U-shaped structure, with one receiving end facing one transmitting end;

[0023] The elevator shaft is equipped with several baffles arranged sequentially from top to bottom. During elevator operation, the baffles pass through the grooves of the U-shaped structure; both transmitting ends emit pulsed light signals; the two transmitting ends alternately emit pulsed light signals;

[0024] The dual photoelectric tachometers are electrically connected to the controller, which uses any of the methods described above to calculate the elevator's running speed and direction.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This solution boasts high detection accuracy and strong anti-interference capabilities. Furthermore, based on actual product verification results, the product can operate stably in harsh elevator shafts and exhibits significant advantages such as strong light penetration and interference-free reception and judgment. Attached Figure Description

[0027] Figure 1 This is a perspective view of the dual photoelectric velocimeter of Embodiment 1 of the present invention;

[0028] Figure 2 This is a flowchart of Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0030] Figure 4 This is a hardware connection diagram for Embodiment 2 of the present invention. Detailed Implementation

[0031] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0032] Example 1

[0033] refer to Figure 1 and 2 An anti-interference test method for elevator speed is disclosed, comprising a dual photoelectric speed measuring device 2 installed on an elevator; the dual photoelectric speed measuring device 2 has a U-shaped structure, with two transmitting ends 3 arranged side by side at one end of the U-shaped structure and two receiving ends 4 arranged at the other end of the U-shaped structure, one receiving end 4 facing one transmitting end 3; the elevator shaft is provided with several baffles 5 arranged sequentially from top to bottom, and during elevator operation, the baffles 5 pass through the grooves of the U-shaped structure; both transmitting ends 3 emit pulsed light signals; the two transmitting ends 3 alternately emit pulsed light signals;

[0034] The method is specifically as follows:

[0035] Step 1: Receive the transmission marker emitted by transmitter 3 and start the timer; the transmission marker is generated by transmitter 3 after emitting a pulsed light signal;

[0036] Step 2: Determine whether a receive flag sent by receiver 4 is received within the timer's timing period. If yes, proceed to step 3; otherwise, determine that transmitter 3 is blocked. The receive flag is generated by receiver 4 after receiving the pulse light signal.

[0037] Step 3: Determine whether the receiving mark is sent by the receiving end 4 corresponding to the transmitting end 3 in Step 1. If yes, it is determined that the pulse light signal emitted by the transmitting end 3 is received by the corresponding receiving end 4; otherwise, it is determined that the receiving mark is invalid and the transmitting end 3 is blocked.

[0038] More specifically, taking the alternating transmission of two transmitting ends 3 as an example, the two transmitting ends 3 are respectively the first transmitting end 3 and the second transmitting end 3, and the two receiving ends 4 are respectively the first receiving end 4 and the second receiving end 4. The first transmitting end 3 and the first receiving end 4 are a pair, and the second transmitting end 3 and the second receiving end 4 are a pair. The working steps are as follows:

[0039] Step 11: The timer is reset, and the first transmitter 3 transmits a pulsed light signal, simultaneously generating the first transmission marker;

[0040] Step 12: Wait for the first receiver 4 to transmit a receive marker; if the first receiver 4 receives any transmit pulse light signal within the timing period, it will generate a receive marker;

[0041] Step 13: If the first receiving end 4 does not receive a receiving mark, or receives a receiving mark sent by the second receiving end 4, then it is determined that the first transmitting end 3 is blocked by the baffle 5.

[0042] Step 14: If the first receiving end 4 sends a reception flag, then it is assumed that the first transmitting end 3 is not blocked;

[0043] Steps 11-14 above complete the reception and transmission of one pulse optical signal. The timer will reset after the timing period ends, and then proceed to the following steps:

[0044] Step 21: The timer is reset, and the second transmitter 3 transmits a pulsed light signal, simultaneously generating a second transmission marker;

[0045] Step 12: Wait for the second receiver 4 to transmit a receive marker; if the second receiver 4 receives any transmit pulse light signal within the timing period, it will generate a receive marker;

[0046] Step 13: If the second receiver 4 does not receive a reception mark, or receives a reception mark sent by the first receiver 4, then it is determined that the second transmitter 3 is blocked by the baffle 5.

[0047] Step 14: If the receiving flag sent by the second receiving end 4 is received, then it is assumed that the second transmitting end 3 is not blocked;

[0048] Steps 21-24 above complete the reception and transmission of one pulse optical signal. The timer will be reset after the timing period ends, and then proceed to steps 11-14.

[0049] And so it goes.

[0050] Preferably, the method further includes step 4: calculating the time difference between the two transmitters 3 being blocked one after the other using a timer, and calculating the instantaneous speed of the elevator, wherein the time difference is N timing cycles; and N is a positive integer greater than or equal to 1.

[0051] Generally, the period interval between the first transmitting end 3 and the second transmitting end 3 is 60-70 μs, and the interval between two transmissions from the first transmitting end 3 is 120-130 μs; the timing period is 60-70 μs.

[0052] Since the elevator operates at different speeds at different times, the speed can be calculated by counting the number of timing cycles that have passed between the time interval when the first transmitter 3 and the second transmitter 3 are blocked in turn.

[0053] For example, if the first transmitter 3 is blocked in the first timing cycle and the second transmitter 3 is blocked in the 10th timing cycle, then the elevator speed V = L / t can be calculated based on the 9 timing cycles, where t is the timing cycle multiplied by N; and L is the distance between the two transmitters 3.

[0054] In addition, step 5 is included: determining the elevator's direction of motion based on the order in which the two transmitters 3 are blocked. Steps 4 and 5 combined can be used to calculate the elevator's speed and direction.

[0055] To improve system stability, the working threads of controller 1 should have priorities, with the following priority order: the interrupt priority of the timer is higher than the interrupt priority of receiver 4, and the interrupt priority of receiver 4 is higher than the interrupt priority of transmitter 3.

[0056] In layman's terms, to ensure that the timer's execution priority is higher than receiver 4, which is higher than transmitter 3, this also guarantees...

[0057] The software and control method of this invention require corresponding logical processing. First, suitable pulse signals need to be configured through the two transmitting ends 3. Crucially, the timing of the two transmitting ends 3 must be precisely synchronized, as the pulse duration of 2.06µs is extremely short. Otherwise, errors may occur, causing the two signals to lose their interleaving, potentially leading to interference. Furthermore, at the receiving end 4, the two signals need to be received and detected separately. To ensure timely response, this solution uses a comparator interrupt method, combined with the pulsed light signal generated by the transmitting source, to accurately and promptly detect each signal.

[0058] The pulse-mode dual-channel photoelectric sensor has strict timing requirements for signal transmission and reception detection. For example, the first receiver 4 only performs detection when the first transmitter 3 is marked. If light is received from the second transmitter 3, no response or processing will be performed. The transmitter 3 simultaneously waits for the receive marker. If the receive marker is not detected within the waiting period, it is considered that the light source is blocked, and the corresponding time of the first blocking is recorded. When both light sources are detected to be blocked, other corresponding functions can be further processed based on the recorded time difference.

[0059] Another key aspect of this invention is the effective interrupt handling design. In addition to the pulse interrupt of transmitter 3 and comparator interrupt of receiver 4 mentioned in the above process, the system also requires watchdog interrupt and timer interrupt. For the stability of the entire system, the priority of each interrupt needs to be ensured as follows: watchdog > timer > receiver 4 > transmitter 3. In this way, during the waiting process of the transmitter PWM interrupt, the system can respond to the comparator interrupt of receiver 4 to modify the receive flag. At the same time, the normal timing of the timer interrupt can ensure the accuracy of the time. Finally, the watchdog interrupt ensures the stability of the entire system.

[0060] Through the above design, the system can stably and accurately handle the detection of dual light sources, and logically and effectively avoids interference between the two light sources.

[0061] To further avoid interference, a convex lens is provided before the transmitter 3 and between the receiver 4. The convex lens is used to convert the pulse light signal emitted by the transmitter 3 into a horizontal light signal and to collect the horizontal light signal to the receiver 4.

[0062] In this embodiment, the duty cycle of the pulsed optical signal is less than 10%; preferably less than 5%; preferably less than 3%; preferably less than 2%. In practical applications, the duration of the pulsed optical signal is 2.06 μs; the duty cycle is 1.65%.

[0063] Example 2

[0064] refer to Figure 3 and 4 An elevator system includes a controller 1, and a dual photoelectric speed detector 2 is installed on the elevator 7. The dual photoelectric speed detector 2 has a U-shaped structure, with two transmitting ends 3 arranged side by side at one end of the U-shaped structure and two receiving ends 4 arranged at the other end of the U-shaped structure, with one receiving end 4 facing one transmitting end 3.

[0065] The elevator shaft 6 is equipped with several baffles 5 arranged sequentially from top to bottom. During the operation of the elevator, the baffles 5 will pass through the groove of the U-shaped structure; both transmitting ends 3 emit pulse light signals; the two transmitting ends 3 alternately emit pulse light signals;

[0066] The transmitter 3 and receiver 4 of the dual photoelectric tachometer 2 and the timer 8 are electrically connected to the controller 1. The controller 1 uses the method described in Example 1 to calculate the elevator's running speed and direction.

Claims

1. A method for anti-jamming testing of elevator speed, characterized in that, The method involves a double photoelectric speed detector installed on an elevator; the double photoelectric speed detector is in a U-shaped structure, two emitting ends are arranged side by side at one end of the U-shaped structure, two receiving ends are arranged at the other end of the U-shaped structure, and one receiving end is opposite to one emitting end; a plurality of baffles are arranged in the hoistway of the elevator in sequence from top to bottom, and the baffles will pass through the groove of the U-shaped structure during the operation of the elevator; the two emitting ends both emit pulsed light signals; the two emitting ends emit pulsed light signals alternately. The method specifically comprises: Step 1: receiving an emitting mark emitted by the emitting end and starting a timer; the emitting mark is generated after the emitting end emits a pulsed light signal; Step 2: judging whether a receiving mark sent by the receiving end is received within the timing period of the timer, if yes, proceeding to Step 3, if no, judging that the emitting end is blocked; the receiving mark is generated after the receiving end receives a pulsed light signal; Step 3: judging whether the receiving mark is sent by the receiving end corresponding to the emitting end in Step 1, if yes, judging that the pulsed light signal emitted by the emitting end is received by the corresponding receiving end, if no, judging that the receiving mark is an invalid mark and determining that the emitting end is blocked; Step 4: calculating the time difference between the two emitting ends being blocked in sequence by the timer, and calculating the instantaneous speed of the elevator, the time difference being N timing periods; N is a positive integer greater than or equal to 1.

2. The anti-jamming test method of elevator speed according to claim 1, characterized in that, Step 5: determining the moving direction of the elevator according to the sequence of the two emitting ends being blocked.

3. The anti-jamming test method of elevator speed according to claim 1, characterized in that, The priority of the interruption of the timer is higher than that of the interruption of the receiving end, and the priority of the interruption of the receiving end is higher than that of the interruption of the emitting end.

4. The anti-jamming test method of elevator speed according to claim 1, characterized in that, A convex lens is arranged between the emitting end and the receiving end, and the convex lens is used for changing the pulsed light signal emitted by the emitting end into a horizontal light signal and for collecting the horizontal light signal to the receiving end.

5. The anti-jamming test method of elevator speed according to claim 1, characterized in that, The duty cycle of the pulsed light signal is less than 10%.

6. The anti-jamming test method of elevator speed according to claim 1, characterized in that, The duty cycle of the pulsed light signal is less than 5%.

7. The anti-jamming test method of elevator speed according to claim 1, characterized in that, The duty cycle of the pulsed light signal is less than 3%.

8. The anti-jamming test method of elevator speed according to claim 1, characterized in that, The duration of the pulsed light signal is 1-5μs.

9. The anti-jamming test method of elevator speed according to claim 1, characterized in that, The timing period of the timer is the time interval of the two emitting ends emitting pulsed light signals. The emitting end determines the emission time of the pulsed light signal according to the timing of the timer.

10. An elevator system characterized by A controller is arranged, and a double photoelectric speed detector is installed on the elevator; the double photoelectric speed detector is in a U-shaped structure, two emitting ends are arranged side by side at one end of the U-shaped structure, and two receiving ends are arranged at the other end of the U-shaped structure, and one receiving end is opposite to one emitting end; A plurality of baffles are arranged in the hoistway of the elevator in sequence from top to bottom, and the baffles will pass through the groove of the U-shaped structure during the operation of the elevator; the two emitting ends both emit pulsed light signals; the two emitting ends emit pulsed light signals alternately. The double photoelectric speed detector is electrically connected to the controller, and the controller realizes the calculation of the running speed and the moving direction of the elevator by using any one of the methods in claims 1-9.

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