Elevator speed regulation system based on light energy power generation

Abstract

The application discloses an elevator speed regulation system based on light energy power generation, which comprises a vibration detection unit, which detects an elevator vibration signal, and sends the elevator vibration signal to a microprocessor unit connected thereto to trigger a wake-up interrupt; the microprocessor unit is connected with a power management unit, the power management unit is respectively connected with a light energy collection unit and an energy storage unit, the light energy collection unit charges the energy storage unit through the power management unit; the microprocessor unit is connected with an elevator main control subsystem, the microprocessor unit collects voltage and speed data and sends the voltage and speed data to the elevator main control subsystem to generate a running speed curve, and regulates the speed according to the running speed curve. Through light energy power supply, and in combination with light energy power and speed, the regulation frequency and the regulation mode in the speed regulation process are judged, dynamic regulation is realized, an elevator regulation system without additional power supply and post-maintenance is provided, and safe, efficient and comfortable operation of the elevator is ensured.

Description

Technical Field

[0001] This invention relates to the field of elevator speed control technology, and in particular to an elevator speed control system based on solar power. Background Technology

[0002] Elevator speed control directly impacts its operating efficiency, significantly affecting comfort and safety. Excessive speed can cause discomfort and fear among passengers, while excessively slow speeds can prolong waiting times and reduce the overall riding experience. Therefore, elevator speed control plays a crucial role in improving operating efficiency, enhancing passenger comfort and safety, and contributing to energy conservation and emission reduction. While current technologies utilize photovoltaic energy storage to power elevators, the lack of consideration for the low efficiency of photovoltaic power generation results in inaccurate speed control and insufficient energy utilization.

[0003] For example, a "photovoltaic energy storage elevator" disclosed in Chinese patent literature, publication number CN220787738U, discloses an elevator system comprising an energy management system, an energy storage device, a photovoltaic power generation device, a mains power input device, a DC bus, and an elevator main control system. Specifically: the output of the mains power input device is connected to the DC bus, providing power to it; the elevator main control system is connected to the DC bus and controls elevator operation based on the input DC power; the energy management system is connected to the energy storage device, the photovoltaic power generation device, and the mains power input device respectively, controlling the connection or disconnection of each device to the DC bus based on feedback information from these devices; the energy storage device is also connected to both the DC bus and the mains power input device, charging or discharging according to control commands from the energy management system; and the photovoltaic power generation device is also connected to the DC bus, converting solar energy into DC power according to control commands from the energy management system. However, this design does not consider the impact of solar power supply efficiency on the elevator. Summary of the Invention

[0004] To address the issue of the impact of solar power efficiency on elevators in existing technologies, this invention provides an elevator speed control system based on solar power, which monitors the elevator's operating speed in real time and uploads the data along with the power consumption to the elevator mainboard for dynamic adjustment.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An elevator speed control system based on solar power includes: a vibration detection unit that detects elevator vibration signals and sends the elevator vibration signals to a microprocessor unit connected thereto to trigger a wake-up interrupt;

[0007] The microprocessor unit is connected to a power management unit, which is connected to a light energy harvesting unit and an energy storage unit. The light energy harvesting unit charges the energy storage unit through the power management unit.

[0008] The microprocessor unit is connected to the elevator main control subsystem. It collects voltage and speed data and sends it to the main control subsystem to generate an operating speed curve. The speed is then adjusted based on this curve. Powered by solar energy, and combining solar energy consumption and speed data, the system determines the control frequency and method during speed regulation, achieving dynamic control. This provides an elevator control system that requires no additional power supply and is maintenance-free. Real-time monitoring of the elevator's operating speed and uploading the data to the main control board ensures safe, efficient, and comfortable elevator operation.

[0009] Preferably, the microprocessor unit is woken up by the elevator vibration signal and goes into sleep mode when no elevator vibration signal is received within a fixed time range.

[0010] When the microprocessor unit wakes up, it collects voltage and determines battery level. The microprocessor unit also collects speed data at fixed intervals. Vibration signals are used to determine whether the elevator is running and to wake up the microprocessor unit, avoiding the need for additional sleep / start circuits and rules. This optimizes power consumption control of the entire system with minimal power consumption.

[0011] Preferably, the microprocessor unit judges the collected voltage and speed data, and sends the corresponding voltage and speed data to the elevator main control subsystem according to the judgment result;

[0012] The elevator main control subsystem generates a speed curve based on voltage and speed data.

[0013] Preferably, the microprocessor unit determines the transmission method based on speed data, including determining the elevator operating speed type based on the speed data. When different elevator operating speed types are determined, data is transmitted to the elevator main control subsystem using different transmission methods. This enables the determination of data transmission type through voltage data, thereby changing the corresponding control frequency so that different elevator operating speeds have different control frequencies and methods.

[0014] Preferably, the elevator main control subsystem adjusts the operating speed curve based on voltage data, including threshold judgment of the voltage data. When the voltage data reaches the threshold, the elevator main control subsystem generates a corresponding operating speed curve. This achieves speed regulation based on voltage data, and can combine the functional efficiency of light energy to achieve dynamic speed adjustment, thereby making rational use of light energy and ensuring the elevator's operating speed.

[0015] Preferably, the microprocessor unit is connected to an indicator unit, which flashes after the microprocessor unit sends data.

[0016] The indicator unit flashes a fixed number of times and is controlled by the microprocessor unit. Using the indicator unit for indication facilitates determination of whether the microprocessor unit has successfully transmitted data.

[0017] Preferably, the elevator main control subsystem is connected to a distance measurement unit, which measures the distance between the elevator's current position and the target floor.

[0018] The elevator main control subsystem adjusts the operating speed curve based on distance. This allows for additional adjustment based on distance when neither solar power supply nor speed-related data can accurately and effectively control the elevator speed. This avoids malfunctions caused by inaccurate voltage data acquisition or errors in speed data transmission when solar power provides voltage.

[0019] Preferably, the light energy harvesting unit includes a solar panel with two layers of semiconductor material arranged sequentially, one layer of semiconductor material having a positive charge and the other layer having a negative charge. When irradiated by light, a potential difference is generated between the positive and negative ion layers, thereby generating current and realizing the conversion of light energy into electrical energy.

[0020] Preferably, the power management unit has multiple charging modes, and different charging modes correspond to different battery capacities.

[0021] The battery capacity mentioned refers to the remaining power of the energy storage unit. This allows for the use of different charging modes at different battery levels, avoiding damage to battery life and thus better protecting the battery.

[0022] Preferably, the microprocessor unit integrates a wireless radio frequency module, which is connected to the elevator main control subsystem.

[0023] The aforementioned wireless radio frequency module transmits voltage and speed data to the elevator's main control subsystem. Uploading data via an integrated wireless radio frequency module reduces redundant structures.

[0024] The present invention has the following advantages:

[0025] (1) By using light power supply and combining light power quantity and speed to judge the control frequency and control method in the speed control process, dynamic control is achieved, providing an elevator control system that does not require additional power supply and is maintenance-free in the later stage; real-time monitoring of elevator running speed and uploading to the elevator main board for dynamic control, ensuring the safe, efficient and comfortable operation of the elevator; (2) The data transmission type is determined by voltage data, thereby changing the corresponding control frequency, so that different elevator running speeds have different control frequencies and methods; (3) When light power supply and speed-related data cannot accurately and effectively control the elevator speed, additional control can be carried out by distance, avoiding the fault situation caused by light providing voltage but inaccurate voltage data acquisition and speed data transmission errors. Attached Figure Description

[0026] The accompanying drawings described below are merely exemplary. Those skilled in the art can derive other embodiments based on the provided drawings without any inventive effort.

[0027] Figure 1 This is a schematic diagram of the working logic in the embodiment.

[0028] Figure 2 This is a schematic diagram of the installation structure in the embodiment.

[0029] Figure 3 This is a flowchart of the wireless speed measurement unit in the embodiment.

[0030] In the picture:

[0031] 1-Elevator main control subsystem; 2-Glass; 3-Car; 4-Speed ​​measuring unit. Detailed Implementation

[0032] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figures 1-3 As shown, in a preferred embodiment, the present invention discloses an elevator speed control system based on solar power, comprising: a vibration detection unit disposed at the elevator, which detects elevator vibration signals and sends them to a microprocessor unit connected thereto to trigger a wake-up interrupt. This achieves energy saving and, in fact, operates independently of the elevator's own control system, without consuming additional power.

[0034] The microprocessor unit is connected to a power management unit, which is connected to a light source to supply power through light energy. The microprocessor unit combines the amount of light energy and the speed to determine the control frequency and control method during the speed control process, and uses the light energy acquisition unit to charge the energy storage unit through the power management unit.

[0035] The microprocessor unit is connected to the elevator main control subsystem. It collects voltage and speed data and sends it to the main control subsystem to generate an operating speed curve. The speed is then adjusted based on this curve. This dynamic control system provides an elevator control system that requires no additional power supply and is maintenance-free. It monitors the elevator's operating speed in real time and uploads the data to the main control board for dynamic adjustment, ensuring safe, efficient, and comfortable elevator operation.

[0036] In other embodiments, the microprocessor unit determines whether the elevator is running by using vibration signals and wakes up the microprocessor unit by using vibration signals, avoiding the need to set up additional sleep start circuits and rules, and optimizing the power consumption control of the entire system with the lowest power consumption.

[0037] In other embodiments, the microprocessor unit judges the collected voltage and speed data, and if the judgment is successful, uploads the corresponding voltage and speed data together to the elevator main control subsystem. This achieves data acquisition for the elevator main control subsystem.

[0038] In other embodiments, the microprocessor unit determines the elevator's operating speed type (acceleration, deceleration, or constant speed) based on speed data, and sends data to the elevator main control subsystem according to different transmission methods. This allows the data transmission type to be determined through voltage data, thereby enabling the adjustment of the corresponding control frequency, resulting in different control frequencies and methods for different elevator operating speeds.

[0039] In other embodiments, the elevator main control subsystem performs threshold judgment on voltage data to achieve speed regulation based on the voltage data, and can achieve dynamic speed adjustment by combining the functional efficiency of light energy. When the voltage data reaches the threshold, the elevator main control subsystem generates a corresponding operating speed curve. This ensures the rational use of light energy and guarantees the elevator's operating speed.

[0040] In other embodiments, the microprocessor unit is connected to an indicator unit that flashes after the microprocessor unit successfully transmits voltage and speed data. This indicator unit facilitates determination of whether the microprocessor unit has successfully transmitted data.

[0041] In other embodiments, the elevator main control subsystem is connected to a distance measurement unit, which enables multi-dimensional control. This allows for additional control via distance when neither light power supply nor speed-related data can accurately and effectively regulate the elevator speed. This avoids malfunctions caused by inaccurate voltage data acquisition or errors in speed data transmission when light provides voltage.

[0042] In other embodiments, the charging management unit has multiple charging modes, and different charging modes are used for different battery capacities; this allows different charging modes to be used under different battery capacities, avoiding damage to battery life and thus better protecting the battery.

[0043] In other embodiments, the microprocessor unit integrates a wireless radio frequency module, which is connected to the elevator main control subsystem; voltage and speed data are uploaded to the elevator main control subsystem through the integrated wireless radio frequency module, reducing redundant structures.

[0044] In other embodiments, this solution discloses an elevator speed control method based on solar power, including the following steps: acquiring elevator vibration signals; determining whether the elevator is running based on the vibration signals; when an elevator vibration signal is acquired, determining that the elevator is in operation; when no elevator vibration signal is acquired within a certain time range, determining that the elevator is stationary. This method enables determining whether the elevator is in operation based on vibration status; when the elevator is determined to be in operation, the elevator speed is adjusted by combining solar power acquisition and speed curves. This allows for real-time speed control, improving the energy utilization efficiency of solar power supply and enhancing control accuracy. Ultimately, it improves the energy utilization efficiency and control accuracy of the system.

[0045] In other embodiments, this solution includes performing predetermined control of the elevator according to a predetermined template. During the predetermined control, battery voltage data and running speed data are collected in real time. A speed curve is generated based on the real-time collected battery voltage data and running speed data. The predetermined control of the elevator is adjusted according to the speed curve.

[0046] In other embodiments, the speed curve in this scheme includes a basic curve and fitting parameters. Multiple stage speed curves are obtained by adjusting the basic curve based on the fitting parameters. Different stages of elevator operation are controlled separately based on these stage speed curves. Multiple stage speed curves are combined to form a total speed curve, thereby achieving dynamic control of the elevator's operating speed. The fitting parameters include various types of parameter templates, corresponding to different types such as deceleration, constant speed, and acceleration.

[0047] In other embodiments, this solution includes determining the reliability of elevator operating speed based on voltage data from solar power. First, elevator operating speed data is acquired periodically, and a threshold judgment is applied to this data. When the elevator operating speed exceeds the threshold, both the elevator operating speed data and battery voltage data are simultaneously collected, and a threshold judgment is applied to the battery voltage data. When the battery voltage data is within the normal range, the corresponding operating speed data is considered reliable, indicating normal speed detection and data upload. When the battery voltage data is outside the normal range, the corresponding operating speed data is considered unreliable, indicating an upload error. This data is discarded, and speed control is instead performed based on distance judgment. In this case, distance data is additionally acquired from different detection units for elevator speed control. Furthermore, when the battery voltage data is within the normal range, the corresponding operating speed data is directly processed to generate corresponding fitting parameters, dynamically adjusting the operating speed curve.

[0048] In other embodiments, when determining the reliability of the elevator's operating speed, this solution first periodically acquires the elevator's operating speed data and performs a threshold judgment on the data. When the elevator's operating speed data exceeds the threshold, it indicates that there may be an upload error, and the elevator's operating speed at this time is judged as unreliable. After determining the elevator's operating speed as unreliable, the fitting parameters in the speed curve are adjusted to deceleration parameters. A low-speed operating speed curve is generated based on the deceleration parameters, and the elevator speed is controlled based on this curve. This reduces the elevator's power to achieve low-speed operation.

[0049] In other embodiments, when determining the reliability of the elevator's operating speed, if the elevator's operating speed does not exceed a threshold, the system combines distance data to determine whether it has entered a uniform acceleration state. When the distance data reaches the threshold for determining the uniform acceleration state, uniform acceleration parameters are generated, resulting in a uniform acceleration speed curve. This allows the elevator to be controlled to operate at uniform acceleration, thereby improving operating efficiency.

[0050] In another specific embodiment, the light energy harvesting unit in this solution includes modular solar panels. The light energy harvesting unit comprises multiple modular solar panels spliced ​​together. Each solar panel includes two sequentially arranged semiconductor layers, each semiconductor layer comprising a silicon composite. One of the two semiconductor layers has a positive charge, and the other has a negative charge. When photons strike the semiconductor material on the solar panel, electrons are excited, creating a potential difference between the positive and negative charge ion layers, thereby generating a current and realizing the conversion of light energy into electrical energy. During constant current charging, the current magnitude is determined by a current sensing resistor.

[0051] In another specific embodiment, the power management unit is connected to a charging management unit, which includes a CN3791 charging management chip. The CN3791 charging management chip has multiple charging modes, including trickle charging, constant current charging, and constant voltage charging. Using different modes for different battery capacities better protects the battery.

[0052] In another specific embodiment, the energy storage unit in this solution is equipped with a 3.7V / 1000mAh rechargeable lithium battery, which can continuously provide power for 500 hours when fully charged. Furthermore, the solar panel can be continuously charged under sunlight or LED light, fully meeting the usage requirements. Two resistors are connected to the positive terminal of the power supply; the voltage division between the two resistors is used to determine the power supply voltage, and the corresponding AD value is transmitted to the MCU.

[0053] In another specific embodiment, the power management unit in this solution employs an LDO chip. The LDO chip converts the voltage output from the energy storage unit or the light energy harvesting unit into a voltage supported by the MCU, thereby powering the entire system. The LDO chip includes the HT7533 chip, which has a wide input voltage range and a stable output voltage.

[0054] In another specific embodiment, the microprocessor unit in this solution uses the SI1083 chip, which has programmable properties and integrates a wireless radio frequency module. When the entire system is powered on, the SI1083 chip in the microprocessor unit is activated. The SI1083 chip monitors external interrupts. When the external vibration sensor triggers an interrupt in the SI1083 chip, the chip obtains the elevator's operating status. At this point, the SI1083 chip exits sleep mode, reads the battery voltage, and then assesses the battery level. During battery level assessment, if the battery voltage reaches a low threshold, a low battery indicator is generated, indicating that the battery level is too low. Simultaneously, speed data is read at intervals t, ranging from 20ms to 80ms. The periodically read speed data is evaluated. If the periodically read speed data does not exceed the speed threshold or is at a constant speed, the SI1083 chip periodically transmits the speed data and battery voltage data to the elevator main control subsystem via wireless communication, with the wireless communication occurring once per second. After the speed data and battery voltage data are successfully transmitted periodically via wireless communication, the LED indicator flashes once. When judging the periodically read speed data, if the speed data exceeds a speed threshold, it is determined that the speed is too high. The SI1083 chip then uploads the speed and battery voltage data in real time until the control system reduces the elevator speed below the speed threshold. When the SI1083 chip monitors external interrupts, if the external vibration sensor does not upload a signal for a certain period, the SI1083 chip determines that the elevator is stationary. At this point, speed data uploads cease, and the SI1083 chip enters a sleep state. This reduces the overall system power consumption, allowing the electrical energy generated by the light energy acquisition unit to charge the energy storage unit.

[0055] In another specific embodiment, this solution includes a wireless signal unit connected to the elevator main control subsystem. The wireless signal unit includes a wireless radio frequency module with a frequency of 200Hz-600Hz. The wireless radio frequency module is integrated onto a 1083 chip. The wireless signal unit communicates and transmits speed data and battery voltage data through the wireless radio frequency module integrated on the chip.

[0056] In another specific embodiment, the indicator unit in this solution includes an LED indicator light, which is connected to the MCU and flashes after the MCU successfully completes wireless communication.

[0057] In another specific embodiment, this solution includes a running speed acquisition unit connected to the microprocessor unit and the elevator main control subsystem respectively. The running speed acquisition unit includes, but is not limited to, speed sensors including accelerometers or gyroscopes. The speed sensors monitor the elevator running speed and send the elevator running speed to the elevator main control subsystem.

[0058] In another specific embodiment, the vibration detection unit includes a vibration sensor that monitors the elevator's vibration and sends the vibration data to the MCU. The MCU enters sleep mode and wakes up based on the vibration sensor's signal. When the MCU receives vibration data from the vibration sensor, it wakes up, indicating that the elevator is running, and begins reading the elevator speed data. If the MCU does not receive vibration data from the vibration sensor for an extended period, indicating that the elevator is stationary, the MCU re-enters sleep mode.

[0059] In another specific embodiment, the elevator main control subsystem in this solution controls the operation of the elevator. The elevator main control subsystem receives speed data and battery voltage data sent by the wireless signal unit, and combines the battery voltage data and speed data to issue a speed control signal. This control signal controls the elevator's operating speed.

[0060] In another specific embodiment, the elevator speed control in this solution is affected by the uploaded battery voltage. When the information that the battery voltage is too low is received, the elevator needs to control its speed to avoid speed deviation caused by the speed sensor not uploading speed or by the data deviation collected due to the low battery.

[0061] In another specific embodiment, the elevator speed control described in this solution adjusts the speed curve according to the running distance to achieve efficient elevator operation.

[0062] In another embodiment, this solution discloses an elevator speed control system based on solar power, including a wireless speed measurement unit and an elevator main control subsystem. The wireless speed measurement unit is installed inside the elevator car and collects sunlight or LED light sources. The elevator main control subsystem is located in the machine room and controls the operation of the system.

[0063] In another specific embodiment, the elevator speed is dynamically adjusted based on the speed data sent by the wireless speed measurement unit. If the speed is too low, the elevator will accelerate to the floor level. If the elevator speed exceeds the threshold before reaching the floor level, the main control system will adjust the speed curve to reduce the elevator speed until the elevator reaches the floor level.

[0064] like Figure 3As shown, in this solution, the wireless speed measurement unit installed in the car absorbs sunlight or LED light source through the solar panel in the light energy acquisition unit to obtain power, and then charges the lithium battery through the CN3791 charging management chip and peripheral circuits; and supplies power to the system through the LDO regulated power supply; when there is no sunlight or LED light source, the system is powered solely by the lithium battery; after the microprocessor unit MCU is powered on and starts, it starts interrupt scanning to detect the vibration sensor data of the vibration detection unit in real time. If an interrupt is triggered, it reads the running speed and judges the elevator running speed. If the running speed exceeds the threshold of 4m / s, the wireless temperature measurement unit uploads the collected voltage and speed data in real time; the elevator main control system reads the speed data, judges it, and if the battery voltage is normal, it processes the speed data, that is, dynamically adjusts the running speed curve. If it exceeds the threshold, it reduces the speed based on the distance and adjusts the speed curve; if it does not exceed the running speed threshold of 4m / s, and the current speed is 2m / s, and the distance to the station is far, it can accelerate uniformly to improve the running efficiency.

[0065] If the elevator main control system detects that the battery voltage of the speed measuring unit is too low, it assumes that the speed measuring unit may be experiencing a lack of data upload or data upload errors. Therefore, it controls the elevator to run at a low speed to ensure the safe operation of the elevator.

[0066] This embodiment adopts the industry-popular ultra-low power MCU design and performs low power management in the program to ensure stable power supply to the system.

[0067] like Figure 2 As shown, in this scheme, a car 3 is installed inside the hoistway. Both the car 3 and the hoistway sidewalls are fitted with glass 2. An elevator main control subsystem 1 is installed at the top of the outer side of the hoistway, and a speed measuring unit 4 is installed on the sidewall of the car 3. The speed measuring unit 4 detects the running speed of the car 3 and sends this speed information to the elevator main control subsystem 1. Light is then emitted through the glass 2, allowing it to illuminate the entire system, and combined with a light energy harvesting unit, this enables the extraction of power from sunlight.

[0068] Any modifications or improvements made based on this invention without departing from its spirit are within the scope of protection claimed by this invention.

Claims

1. An elevator speed control system based on solar power, characterized in that, include: The vibration detection unit detects elevator vibration signals and sends them to the microprocessor unit connected to it, triggering a wake-up interrupt. The microprocessor unit is awakened by the elevator vibration signal and goes into sleep mode when no elevator vibration signal is received within a fixed time range; when the microprocessor unit is awakened, it collects voltage and determines battery power, and collects speed data at fixed intervals. The microprocessor unit is connected to a power management unit, which is connected to a light energy harvesting unit and an energy storage unit. The light energy harvesting unit charges the energy storage unit through the power management unit. The microprocessor unit is connected to the elevator main control subsystem. The microprocessor unit collects voltage and speed data and sends them to the elevator main control subsystem to generate an operating speed curve. The speed is then adjusted according to the operating speed curve. The elevator main control subsystem adjusts the operating speed curve based on voltage data, including threshold judgment of the voltage data. When the voltage data reaches the threshold, the elevator main control subsystem generates the corresponding operating speed curve.

2. The elevator speed control system based on solar power according to claim 1, characterized in that, The microprocessor unit judges the collected voltage and speed data, and sends the corresponding voltage and speed data to the elevator main control subsystem according to the judgment result; The elevator main control subsystem generates a speed curve based on voltage and speed data.

3. An elevator speed control system based on solar power as described in claim 1 or 2, characterized in that, The microprocessor unit determines the transmission method based on the speed data, including determining the elevator operating speed type based on the speed data. When different elevator operating speed types are determined, data is transmitted to the elevator main control subsystem using different transmission methods.

4. The elevator speed control system based on solar power according to claim 3, characterized in that, The microprocessor unit is connected to an indicator unit, which flashes after the microprocessor unit sends data. The indicator unit blinks a fixed number of times and is controlled by a microprocessor unit.

5. The elevator speed control system based on solar power according to claim 1, characterized in that, The elevator main control subsystem is connected to a distance measurement unit, which measures the distance between the elevator's current position and the target floor. The elevator's main control subsystem adjusts the operating speed curve based on the distance.

6. An elevator speed control system based on solar power according to claim 1, 2, or 5, characterized in that, The light energy harvesting unit includes a solar panel, which has two layers of semiconductor material arranged in sequence, one layer of semiconductor material having a positive charge and the other layer of semiconductor material having a negative charge.

7. An elevator speed control system based on solar power according to claim 1, 2, or 5, characterized in that, The power management unit has multiple charging modes, and each charging mode corresponds to a different battery capacity. The battery capacity refers to the remaining power of the energy storage unit.

8. An elevator speed control system based on solar power according to claim 1 or 2, characterized in that, The microprocessor unit integrates a wireless radio frequency module, which is connected to the elevator main control subsystem. The wireless radio frequency module transmits voltage and speed data to the elevator main control subsystem.

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