Lift car protection system and method for preventing bottom squatting or top rushing

Abstract

The invention discloses an anti-bottom-squatting or top-rushing lift car protection system and method, relates to the technical field of lift car protection systems, aims to solve the problem of high power consumption of an elevator monitoring system, and is provided with a monitoring module for monitoring the distance between a lift car and a hoistway to obtain a lift car position signal; the monitoring module comprises a self-power-generating unit which generates alternating current through movement of the lift car. According to the lift car protection system capable of preventing bottom collision or top collision, kinetic energy generated by lifting of an elevator is converted into electric energy, energy is supplied to the monitoring module, the condition of bottom collision or top collision can be prevented without adding extra energy consumption, the safety of the elevator is improved, and the service life of the elevator is prolonged. In addition, wiring is not needed, and installation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of car protection systems, and in particular to a car protection system and method for preventing a car from squatting to the bottom or hitting the top. Background Art

[0002] With the development of social economy, high-rise buildings are increasing day by day. As an indispensable means of transportation in modern urban life, the safety of elevators is directly related to the life safety of passengers. Elevator collision and elevator bottoming are two extreme situations in elevator operation, which may lead to serious safety accidents. Therefore, the existence of the elevator car anti-collision or bottoming protection system is very important, which can take timely measures when the elevator is abnormal to prevent the elevator from continuing to run and causing damage.

[0003] For example, there is a Chinese patent with publication number CN105947822A, which relates to an elevator operation status monitoring system and monitoring method, including a first ranging module, a second ranging module and an information processing unit; the first ranging module and the second ranging module are respectively connected to the information processing unit; the first ranging module is used to monitor the distance between the elevator car and the wall of the elevator shaft; the second ranging module is used to monitor the distance between the elevator car and the ceiling and floor of the elevator shaft, but the Chinese patent with publication number CN105947822A requires continuous monitoring of the distance, which greatly increases the power consumption of the elevator and wastes energy. Summary of the invention

[0004] In order to solve the problem of high power consumption of the elevator monitoring system, the present invention proposes a car protection system and method for preventing squatting or hitting the top. The kinetic energy generated by the elevator lifting is converted into electrical energy to power the monitoring module. The system can prevent the top or squatting from occurring without increasing additional energy consumption, thereby ensuring the safety of the car and personnel. Moreover, it does not require wiring and is easy to install.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a car protection system for preventing squatting or hitting the top, comprising a monitoring module for monitoring the distance between the car and the shaft to obtain a car position signal; the monitoring module includes a self-generating unit for generating alternating current through the movement of the car; and an electronic braking module for limiting the movement of the car according to the car position signal.

[0006] In this technical solution, the kinetic energy of the car movement is converted into electrical energy to power the monitoring module, so that real-time monitoring of the distance between the elevator and the top or bottom of the car can be achieved to prevent accidents such as hitting the top or squatting on the bottom. The car protection can be achieved without increasing additional energy consumption. It is easy to install, does not require wiring, and is maintenance-free in the later stage, avoiding the problem of frequent replacement of battery power supply.

[0007] Preferably, the self-generating unit comprises a roller, the roller is connected to a steel wire rope arranged on one side of the car, the steel wire rope drives the roller to rotate, and a magnet with opposite magnetic poles is arranged at the rear end of the roller.

[0008] Preferably, the monitoring module comprises a conversion unit having a rectifier filter circuit and a power conversion circuit, which converts the alternating current generated by the self-generating unit into low-voltage direct current.

[0009] Preferably, the rectification and filtering unit comprises a rectification bridge, and the rectification bridge is connected with a filtering electrolytic capacitor and a filtering chip capacitor.

[0010] Preferably, the output end of the rectifier and filter circuit is connected to the input end of a power conversion circuit, and the power conversion circuit includes a power conversion chip, and the power conversion chip is connected to a plurality of capacitors.

[0011] Preferably, the monitoring module is provided with a detection unit including a distance detection unit and a vibration detection unit, the distance detection unit includes at least one distance measuring sensor, and the vibration detection unit includes at least one vibration sensor.

[0012] Preferably, the distance detection unit measures the distance between the car and the hoistway, including a first distance between the top of the car and the top of the hoistway and a second distance between the bottom of the car and the bottom of the hoistway.

[0013] Preferably, the electronic brake module comprises an electronic brake unit with an electronic speed limiter to limit the movement of the car, and the electronic brake unit is connected to a wireless signal transceiver unit to receive data from the monitoring module.

[0014] The present invention also adopts the following technical solution: a method for controlling a car protection against squatting or top-up, using the above-mentioned car protection system against squatting or top-up, preferably comprising the following steps: S1, when the elevator is running, obtain the distance data between the top and bottom of the car and the hoistway in real time; S2, setting a primary threshold and a secondary threshold, wherein the primary threshold is smaller than the secondary threshold, and setting a number of interval times; S3, uploading the distance data according to the comparison result between the distance data and the threshold value, and controlling the elevator braking.

[0015] Preferably, step S3 includes: if the distance data between the top and bottom of the car and the shaft is greater than the set secondary threshold, the distance data is uploaded once every first interval; if it is less than the set secondary threshold, the distance data is uploaded once every second interval; if it is less than the set primary threshold, the distance data is uploaded once every third interval; when the elevator is stationary for more than the fourth interval, the system enters a sleep state.

[0016] The beneficial effects of the present invention are: 1) The kinetic energy of the car movement is converted into electrical energy to power the monitoring module, which can realize the function of real-time monitoring of the distance between the elevator and the top or bottom of the car without increasing additional energy consumption, and prevent accidents such as squatting at the bottom or rushing to the top; 2) Easy to install, no wiring required, maintenance-free in the later stage, avoiding the problem of frequent replacement of battery power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a system block diagram of a car protection system for preventing the car from squatting to the bottom or rushing to the top.

[0018] Figure 2 It is a flow chart of a car protection control method for preventing squatting or hitting the top according to embodiment 3 of the present invention. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation method described herein is only an optimal embodiment of the present invention, which is only used to explain the present invention and does not limit the scope of protection of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Example 1 This embodiment provides a car protection system to prevent squatting or hitting the top, including two monitoring modules and an electronic brake module. Figure 1 , the distance between the car and the bottom pit or top pit can be monitored, and the threshold can be set to determine whether the braking device needs to be activated to limit the movement of the car.

[0021] In this embodiment, the two monitoring modules are installed at the top and bottom of the car respectively, and are used to monitor the distance from the bottom of the car to the bottom of the shaft and the distance from the top of the car to the top of the shaft, and upload them to the electronic braking module.

[0022] The generator roller of the monitoring module is connected to the elevator wire rope or guide wheel; the electronic brake module is placed on the car top or in the machine room.

[0023] The monitoring module includes a self-generating unit, a conversion unit, a data processing unit, a wireless communication unit, an LED indication unit, a charging management unit, and a power management unit.

[0024] The self-generating unit comprises a steel wire rope, a roller and a stator electric coil; the steel wire rope is on one side of the car and is tightly combined with the roller; the rear end of the roller is a magnet with opposite magnetic poles.

[0025] When the car moves, the wire rope drives the roller to rotate, causing the rear end magnet to rotate and cut the magnetic flux lines of the wire, thereby generating electrical energy.

[0026] The self-generating unit converts the kinetic energy of the car's movement into electrical energy to power the monitoring module, thereby fully utilizing the energy and making it possible for the entire detection process to consume no additional electricity, thereby achieving the purpose of protecting the car and saving resources.

[0027] The conversion unit includes a rectification and filtering circuit and a power conversion circuit.

[0028] The rectifier and filter circuit includes a rectifier bridge, a filter electrolytic capacitor and a filter chip capacitor. The rectifier and filter circuit converts the alternating current generated by the power generation unit cutting the magnetic flux lines into a direct current power supply through the rectifier bridge, and uses the filter electrolytic capacitor and the filter chip capacitor to filter the ripple of the rectifier output to ensure the stability of the output direct current power supply.

[0029] The formula for converting AC voltage to DC voltage under no-load is: The input voltage and output voltage of the rectifier and filter circuit of this embodiment conform to the above formula.

[0030] The power conversion circuit includes a power conversion chip, a filter electrolytic capacitor and a filter chip capacitor. The power conversion chip in the power conversion circuit can convert the high voltage output of the rectifier and filter into a low voltage power supply, and use the filter electrolytic capacitor and the filter chip capacitor to filter the ripple of the power conversion output to ensure the stability of the output DC power supply.

[0031] The conversion unit is also connected to a charging management unit. In this embodiment, the charging management unit uses a CN3791 charging management chip. The CN3791 charging management chip has multiple charging modes such as trickle charging, constant current charging, and constant voltage charging. Selecting different modes under different battery capacities can better protect the battery.

[0032] The constant current charging current is determined by the following formula: Ich=120Mv / Rcs, where Ich is the constant current charging current and Rcs is the current detection resistor connected between the CSP pin and the BAT pin.

[0033] The monitoring module is also provided with an energy storage unit, and the energy storage unit includes a rechargeable lithium battery.

[0034] In this embodiment, the energy storage unit adopts a 3.7V / 1000mAh rechargeable lithium battery, which can continuously provide power to the system for 500 hours when fully charged, and the electric energy generated by the self-generation unit can continuously charge the system, which can fully meet the usage requirements.

[0035] The energy storage unit is connected to a power management unit, which uses an LDO chip to convert the voltage output by the lithium battery or solar panel into a voltage supported by the MCU to power the system.

[0036] In this embodiment, the adopted LDO chip is the HT7533 chip with a wide voltage input and a stable output voltage.

[0037] The power management unit is connected to the data processing unit to provide voltage for the MCU.

[0038] The data processing unit includes an MCU. In this embodiment, the MCU adopts a SI1083 chip. The SI1083 chip has a programmable property and integrates a wireless radio frequency module.

[0039] The data processing unit is also connected to a detection unit, which includes a distance detection unit and a vibration detection unit.

[0040] The distance detection unit includes at least one distance measuring sensor. In this embodiment, the distance measuring sensor used may be an ultrasonic distance measuring sensor, a laser distance measuring sensor or an infrared distance measuring sensor.

[0041] The ranging sensor of the monitoring module placed on the top of the car is placed on the top of the car, and the distance from the top of the car to the top of the shaft is measured to obtain a first distance. The ranging sensor of the monitoring module placed at the bottom of the car is placed at the bottom of the car, and the distance from the bottom of the car to the bottom of the shaft is measured to obtain a second distance.

[0042] The distance detection unit transmits the measured distance value to the data processing unit for data analysis and processing.

[0043] After the system is powered on, the SI1083 chip of the data processing unit is started, and the external interrupt is monitored. If the external vibration sensor triggers the MCU interrupt, it is considered that the elevator is running, the MCU exits sleep, and reads the distance data transmitted by the distance monitoring module in real time for analysis and comparison.

[0044] In this embodiment, a primary threshold and a secondary threshold are set for analysis and comparison. If the distance data read in real time is greater than the set secondary threshold, the distance data is uploaded once every 5s via wireless communication; if the distance number read in real time is less than the set secondary threshold, the distance data is uploaded once every 50ms via wireless communication; if the distance number read in real time is less than the set primary threshold, the distance data is uploaded once every 5ms via wireless communication; if the external vibration sensor has no signal uploaded for more than 3 minutes, it is considered that the elevator is in a stationary state, and there is no need to upload distance data at this time, so it enters a dormant state to reduce system power consumption.

[0045] By monitoring the elevator status through vibration sensors, it is possible to avoid continuously uploading invalid distance data when the elevator is stationary, further saving energy.

[0046] The data processing unit is also connected to a wireless communication unit, which is used to send the distance data encrypted by the data processing unit. This wireless communication can adopt communication methods including but not limited to 2.4G, LoRa, and NB.

[0047] The monitoring module also includes an LED indicating unit, which is connected to the data processing unit. The LED indicating unit lights up the LED indicator light according to the data processing unit signal. Whenever the signal is sent successfully, the LED indicator light flashes once.

[0048] The electronic brake module receives the distance data uploaded by the monitoring module, and compares it with the set threshold value to make a judgment and control the movement of the car, thereby protecting the car.

[0049] The electronic brake module comprises a power conversion circuit, a data processing unit, a wireless signal transceiver unit and an electronic brake unit.

[0050] The power conversion circuit is used for power conversion, converting the supply voltage into a voltage recognizable by the MCU.

[0051] The data processing unit receives the car position signal uploaded by the monitoring module, and when the distance is less than the set first-level threshold, controls the electronic speed limiter to limit the car from continuing to move, thereby preventing the risk of squatting at the bottom or rushing to the top.

[0052] The wireless signal transceiver unit is used to send and receive unlimited encrypted data sent by the monitoring module. This wireless communication can adopt communication methods including but not limited to 2.4G, LoRa, and NB.

[0053] The electronic brake module and the monitoring module realize wireless data transmission through wireless communication between the wireless signal transceiver unit and the wireless communication unit.

[0054] The electronic brake unit receives instructions from the data processing unit to control the action of the electronic brake unit. When the electronic brake unit is in action, the elevator car cannot run to prevent it from squatting or hitting the top.

[0055] The working principle of the car protection system for preventing squatting or hitting the top of the car according to the present invention is described in detail below.

[0056] The self-generating unit uses the movement of the car to drive the roller on the wire rope or the guide rail to move, and the roller drives the rear-end magnet to rotate and cut the magnetic flux lines of the wire, thereby generating electricity to charge the lithium battery of the energy storage unit; the electricity generated by the self-generating unit is passed through the rectifier and filter circuit to generate a stable voltage for the rechargeable lithium battery of the energy storage unit to store and use for equipment operation; the power generated by the self-generating unit and the power of the lithium battery are used to power the system through the LDO of the power management unit. The distance detection unit of the monitoring module uses a distance sensor, such as an ultrasonic distance sensor, a laser distance sensor or an infrared distance sensor, to measure the distance between the bottom or top of the car and the bottom or top of the shaft; after the MCU of the data processing unit is powered, the vibration sensor interrupt triggers the wake-up interrupt, reads the distance between the car and the top and bottom of the shaft, and transmits it to the electronic brake unit through a wireless signal. If the received data is greater than the set secondary threshold, the distance data is uploaded once every 10s through wireless communication; if the received data is less than the set secondary threshold, the distance data is uploaded once every 100ms through wireless communication; if the received data is less than the set primary threshold, the distance data is uploaded once every 10ms through wireless communication. The electronic braking unit compares the received data with the internally set threshold. When the received distance data is less than the set first-level threshold, the electronic speed limiter is controlled to limit the continued movement of the car, thereby achieving the elevator braking effect and preventing the car from squatting at the bottom or rushing to the top.

[0057] From the perspective of elevator safety, this embodiment provides a car protection system to prevent the elevator from squatting on the bottom or hitting the top. By converting the kinetic energy of the car movement into electrical energy to power the monitoring module, real-time monitoring of the distance between the elevator and the top or bottom of the car is achieved to prevent accidents such as hitting the top or squatting on the bottom, thereby protecting the car. In addition, the system is easy to install, does not require wiring, and is maintenance-free in the later stage, thus avoiding the problem of frequent replacement of battery power supply.

[0058] Example 2 This embodiment provides a car protection system to prevent squatting or hitting the top, including two monitoring modules and an electronic brake module. Figure 1 , the distance between the car and the bottom pit or top pit can be monitored, and the threshold can be set to determine whether the braking device needs to be activated to limit the movement of the car.

[0059] In this embodiment, the two monitoring modules are installed at the top and bottom of the car respectively, and are used to monitor the distance from the bottom of the car to the bottom of the shaft and the distance from the top of the car to the top of the shaft, and upload them to the electronic braking module.

[0060] The generator roller of the monitoring module is connected to the elevator wire rope or guide wheel; the electronic brake module is placed on the car top or in the machine room.

[0061] The monitoring module includes a self-generating unit, a conversion unit, a data processing unit, a wireless communication unit, an LED indication unit, a charging management unit, and a power management unit.

[0062] The self-generating unit comprises a steel wire rope, a roller and a stator electric coil; the steel wire rope is on one side of the car and is tightly combined with the roller; the rear end of the roller is a magnet with opposite magnetic poles.

[0063] When the car moves, the wire rope drives the roller to rotate, causing the rear end magnet to rotate and cut the magnetic flux lines of the wire, thereby generating electrical energy.

[0064] The self-generating unit converts the kinetic energy of the car's movement into electrical energy to power the monitoring module, thereby fully utilizing the energy and making it possible for the entire detection process to consume no additional electricity, thereby achieving the purpose of protecting the car and saving resources.

[0065] The conversion unit includes a rectification and filtering circuit and a power conversion circuit.

[0066] The rectifier and filter circuit includes a rectifier bridge, a filter electrolytic capacitor and a filter chip capacitor. The rectifier and filter circuit converts the alternating current generated by the power generation unit cutting the magnetic flux lines into a direct current power supply through the rectifier bridge, and uses the filter electrolytic capacitor and the filter chip capacitor to filter the ripple of the rectifier output to ensure the stability of the output direct current power supply.

[0067] The formula for converting AC voltage to DC voltage under no-load is: The input voltage and output voltage of the rectifier and filter circuit of this embodiment conform to the above formula.

[0068] The power conversion circuit includes a power conversion chip, a filter electrolytic capacitor and a filter chip capacitor. The power conversion chip in the power conversion circuit can convert the high voltage output of the rectifier and filter into a low voltage power supply, and use the filter electrolytic capacitor and the filter chip capacitor to filter the ripple of the power conversion output to ensure the stability of the output DC power supply.

[0069] The conversion unit is also connected to a charging management unit. In this embodiment, the charging management unit uses a CN3791 charging management chip. The CN3791 charging management chip has multiple charging modes such as trickle charging, constant current charging, and constant voltage charging. Selecting different modes under different battery capacities can better protect the battery.

[0070] The constant current charging current is determined by the following formula: Ich=120Mv / Rcs, where Ich is the constant current charging current and Rcs is the current detection resistor connected between the CSP pin and the BAT pin.

[0071] The monitoring module is also provided with an energy storage unit, and the energy storage unit includes a rechargeable lithium battery.

[0072] In this embodiment, the energy storage unit adopts a 3.7V / 1000mAh rechargeable lithium battery, which can continuously provide power to the system for 500 hours when fully charged, and the electric energy generated by the self-generation unit can continuously charge the system, which can fully meet the usage requirements.

[0073] The energy storage unit is connected to a power management unit, which uses an LDO chip to convert the voltage output by the lithium battery or solar panel into a voltage supported by the MCU to power the system.

[0074] In this embodiment, the adopted LDO chip is the HT7533 chip with a wide voltage input and a stable output voltage.

[0075] The power management unit is connected to the data processing unit to provide voltage for the MCU.

[0076] The data processing unit includes an MCU. In this embodiment, the MCU adopts a SI1083 chip. The SI1083 chip has a programmable property and integrates a wireless radio frequency module.

[0077] The data processing unit is also connected to a detection unit, which includes a distance detection unit and a vibration detection unit.

[0078] The distance detection unit includes at least one distance measuring sensor. In this embodiment, the distance measuring sensor used may be an ultrasonic distance measuring sensor, a laser distance measuring sensor or an infrared distance measuring sensor.

[0079] The ranging sensor of the monitoring module placed on the top of the car is placed on the top of the car, and the distance from the top of the car to the top of the shaft is measured to obtain a first distance. The ranging sensor of the monitoring module placed at the bottom of the car is placed at the bottom of the car, and the distance from the bottom of the car to the bottom of the shaft is measured to obtain a second distance.

[0080] The distance detection unit transmits the measured distance value to the data processing unit for data analysis and processing.

[0081] After the system is powered on, the SI1083 chip of the data processing unit is started, and the external interrupt is monitored. If the external vibration sensor triggers the MCU interrupt, it is considered that the elevator is running, the MCU exits sleep, and reads the distance data transmitted by the distance monitoring module in real time for analysis and comparison.

[0082] In this embodiment, a primary threshold and a secondary threshold are set for analysis and comparison. If the distance data read in real time is greater than the set secondary threshold, the distance data is uploaded once every 10s through wireless communication; if the distance number read in real time is less than the set secondary threshold, the distance data is uploaded once every 100ms through wireless communication; if the distance number read in real time is less than the set primary threshold, the distance data is uploaded once every 10ms through wireless communication; if the external vibration sensor has no signal uploaded for more than 2 minutes, it is considered that the elevator is in a stationary state, and there is no need to upload distance data at this time, so it enters a dormant state to reduce system power consumption.

[0083] By monitoring the elevator status through vibration sensors, it is possible to avoid continuously uploading invalid distance data when the elevator is stationary, further saving energy.

[0084] The data processing unit is also connected to a wireless communication unit, which is used to send the distance data encrypted by the data processing unit. This wireless communication can adopt communication methods including but not limited to 2.4G, LoRa, and NB.

[0085] The monitoring module also includes an LED indicating unit, which is connected to the data processing unit. The LED indicating unit lights up the LED indicator light according to the data processing unit signal. Whenever the signal is sent successfully, the LED indicator light flashes once.

[0086] The electronic brake module receives the distance data uploaded by the monitoring module, and compares it with the set threshold value to make a judgment and control the movement of the car, thereby protecting the car.

[0087] The electronic brake module comprises a power conversion circuit, a data processing unit, a wireless signal transceiver unit and an electronic brake unit.

[0088] The power conversion circuit is used for power conversion, converting the supply voltage into a voltage recognizable by the MCU.

[0089] The data processing unit receives the car position signal uploaded by the monitoring module, and when the distance is less than the set first-level threshold, controls the electronic speed limiter to limit the car from continuing to move, thereby preventing the risk of squatting at the bottom or rushing to the top.

[0090] The wireless signal transceiver unit is used to send and receive unlimited encrypted data sent by the monitoring module. This wireless communication can adopt communication methods including but not limited to 2.4G, LoRa, and NB.

[0091] The electronic brake module and the monitoring module realize wireless data transmission through wireless communication between the wireless signal transceiver unit and the wireless communication unit.

[0092] The electronic brake unit receives instructions from the data processing unit to control the action of the electronic brake unit. When the electronic brake unit is in action, the elevator car cannot run to prevent it from squatting or hitting the top.

[0093] The working principle of the car protection system for preventing squatting or hitting the top of the car according to the present invention is described in detail below.

[0094] The self-generating unit uses the movement of the car to drive the roller on the wire rope or the guide rail to move, and the roller drives the rear-end magnet to rotate and cut the magnetic flux lines of the wire, thereby generating electricity to charge the lithium battery of the energy storage unit; the electricity generated by the self-generating unit is passed through the rectifier and filter circuit to generate a stable voltage for the rechargeable lithium battery of the energy storage unit to store and use for equipment operation; the power generated by the self-generating unit and the power of the lithium battery are used to power the system through the LDO of the power management unit. The distance detection unit of the monitoring module uses a distance sensor, such as an ultrasonic distance sensor, a laser distance sensor or an infrared distance sensor, to measure the distance between the bottom or top of the car and the bottom or top of the shaft; after the MCU of the data processing unit is powered, it triggers a wake-up interrupt through the vibration sensor interrupt, reads the distance between the car and the top and bottom of the shaft, and transmits it to the electronic brake unit through a wireless signal. If the received data is greater than the set secondary threshold, the distance data is uploaded once every 5s through wireless communication; if the received data is less than the set secondary threshold, the distance data is uploaded once every 50ms through wireless communication; if the received data is less than the set primary threshold, the distance data is uploaded once every 5ms through wireless communication. The electronic braking unit compares the received data with the internally set threshold. When the received distance data is less than the set first-level threshold, the electronic speed limiter is controlled to limit the continued movement of the car, thereby achieving the elevator braking effect and preventing the car from squatting at the bottom or rushing to the top.

[0095] From the perspective of elevator safety, this embodiment provides a car protection system to prevent the elevator from squatting on the bottom or hitting the top. By converting the kinetic energy of the car movement into electrical energy to power the monitoring module, real-time monitoring of the distance between the elevator and the top or bottom of the car is achieved to prevent accidents such as hitting the top or squatting on the bottom, thereby protecting the car. In addition, the system is easy to install, does not require wiring, and is maintenance-free in the later stage, thus avoiding the problem of frequent replacement of battery power supply.

[0096] Example 3 This embodiment provides a method for controlling a car protection against squatting or top-up, and adopts the above-mentioned car protection system against squatting or top-up, mainly including the following steps, and the flowchart is referred to as Figure 2 .

[0097] First, the system is initialized and configured, including GPIO configuration, mid-end configuration, RF parameter configuration, clock configuration and IIC configuration. After initialization, it waits for interrupts. Before the interrupt is triggered, the system is in a dormant state.

[0098] The vibration sensor detects whether the elevator is moving. If the elevator is moving, the vibration sensor interrupt is triggered, causing the system to exit the sleep state.

[0099] The system reads the distance data between the top and bottom of the car and the hoistway detected by the distance detection sensor of the distance detection unit, and then uploads the distance data based on the comparison result with the set threshold value to control the elevator braking.

[0100] Specifically, if the distance data between the top and bottom of the car and the shaft is greater than the set secondary threshold, the distance data is uploaded once every first interval; if it is less than the set secondary threshold, the distance data is uploaded once every second interval; if it is less than the set primary threshold, the distance data is uploaded once every third interval.

[0101] When the elevator remains stationary for more than the fourth interval, the system enters a dormant state and does not upload distance data, thus saving energy.

[0102] In this embodiment, the first interval time is set to 5s, the second interval time is set to 50ms, the third interval time is set to 5ms, and the fourth interval time is set to 3min.

[0103] The LED flashes once each time the distance data is successfully sent, and the distance data is sent again for confirmation.

[0104] The electronic brake module receives the distance data, and when the distance data is less than the first-level threshold, controls the car to brake to prevent the car from squatting at the bottom or hitting the top.

Claims

1. A car protection system for preventing squatting or top-hitting, characterized in that: The system is provided with a monitoring module for monitoring the distance between the car and the shaft and obtaining a car position signal; the monitoring module comprises a self-generating unit for generating alternating current through the movement of the car; and an electronic braking module for limiting the movement of the car according to the car position signal.

2. The car protection system for preventing squatting or top-hitting according to claim 1, characterized in that: The self-generating unit comprises a roller, the roller is connected to a steel wire rope arranged on one side of the car, the steel wire rope drives the roller to rotate, and a magnet with opposite magnetic poles is arranged at the rear end of the roller.

3. The car protection system for preventing squatting or top-hitting according to claim 1, characterized in that: The monitoring module includes a conversion unit having a rectifier filter circuit and a power conversion circuit, which converts the alternating current generated by the self-generating unit into low-voltage direct current.

4. The car protection system for preventing squatting or top-hitting according to claim 3, characterized in that: The rectifying and filtering unit comprises a rectifying bridge, and the rectifying bridge is connected with a filtering electrolytic capacitor and a filtering chip capacitor.

5. The anti-bottoming or top-hitting car protection system according to claim 3, characterized in that: The output end of the rectifier and filter circuit is connected to the input end of the power conversion circuit. The power conversion circuit includes a power conversion chip. The power conversion chip is connected to a plurality of capacitors.

6. The car protection system for preventing squatting or top-hitting according to claim 1, characterized in that: The monitoring module is provided with a detection unit including a distance detection unit and a vibration detection unit. The distance detection unit includes at least one distance measuring sensor, and the vibration detection unit includes at least one vibration sensor.

7. The car protection system for preventing squatting or top-impacting according to claim 1, characterized in that: The distance detection unit measures the distance between the car and the hoistway, including a first distance between the top of the car and the top of the hoistway and a second distance between the bottom of the car and the bottom of the hoistway.

8. A car protection system for preventing squatting or top-hitting according to any one of claims 1 to 7, characterized in that: The electronic brake module includes an electronic brake unit with an electronic speed limiter to limit the movement of the car. The electronic brake unit is connected to a wireless signal transceiver unit to receive data from the monitoring module.

9. A method for controlling a car protection against bottom squatting or top bumping, using a car protection system against bottom squatting or top bumping according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, when the elevator is running, obtain the distance data between the top and bottom of the car and the hoistway in real time; S2, setting a primary threshold and a secondary threshold, wherein the primary threshold is smaller than the secondary threshold, and setting a number of interval times; S3, uploading the distance data according to the comparison result between the distance data and the threshold value, and controlling the elevator braking.

10. A car protection control method for preventing squatting or top-hitting according to claim 9, characterized in that: The step S3 includes: if the distance data between the top and bottom of the car and the shaft is greater than the set secondary threshold, the distance data is uploaded once every first interval; if it is less than the set secondary threshold, the distance data is uploaded once every second interval; if it is less than the set primary threshold, the distance data is uploaded once every third interval; when the elevator is stationary for more than the fourth interval, the system enters a dormant state.

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