A hostless elevator drive method

Abstract

This invention discloses a hostless elevator drive method applied to an elevator drive device. The device includes a control cabinet, a car drive module, and a counterweight drive module. The car drive module is connected to the counterweight drive module via a traction sheave and steel cables. The car drive module includes a car-side water tank located at the bottom of the car, a car-side measuring unit located within the car-side water tank, and a reversible pump-turbine unit located at the bottom of the car-side water tank. The counterweight drive module includes a counterweight-side water tank, a counterweight-side measuring unit located within the counterweight-side water tank, and an electric regulating valve located at the bottom of the counterweight-side water tank. The reversible pump-turbine unit is connected to the electric regulating valve via water pipes. The control cabinet is connected to the car-side measuring unit, the reversible pump-turbine unit, the counterweight-side measuring unit, and the electric regulating valve. This invention eliminates the need for a traction machine to overcome unbalanced forces and friction, and eliminates the need for a host machine to drive the traction machine, thus reducing energy consumption and avoiding the problem of a large space occupied by a host machine.

Description

Technical Field

[0001] This invention relates to the field of elevator drive technology, and in particular to a hostless elevator drive method. Background Technology

[0002] In the field of elevator drive, most traction elevators are driven by AC variable frequency speed-regulating permanent magnet synchronous motors. Their driving principle relies on the traction machine (motor) to overcome unbalanced forces and friction, and they continuously consume electrical energy during the driving process.

[0003] Although the development of frequency converters and the use of energy feedback devices can significantly reduce energy consumption, elevators still have high energy consumption when going down unloaded and going up fully loaded. Furthermore, traction elevators rely on the main unit to drive the traction machine, which requires a machine room or a large space at the top of the shaft.

[0004] Therefore, existing elevator drive devices suffer from high energy consumption and large space requirements for the main unit. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a hostless elevator drive method, which achieves gravity drive by actively adjusting the water volume difference between the car-side water tank and the counterweight-side water tank. It does not require a traction machine (motor) to overcome unbalanced forces and friction, and does not require a host to drive the traction machine, which can reduce energy consumption and avoid the problem of a large space occupied by a host.

[0006] To solve the above problems, the present invention is implemented according to the following solution:

[0007] A hostless elevator drive device is provided, including: a control cabinet, a car drive module and a counterweight drive module, wherein the car drive module is connected to the counterweight drive module through a traction sheave and a steel wire rope;

[0008] The car drive module includes a car-side water tank located at the bottom of the car, a car-side measuring unit located inside the car-side water tank, and a reversible water pump turbine unit located at the bottom of the car-side water tank.

[0009] The counterweight drive module includes a counterweight side water tank, a counterweight side measuring unit located inside the counterweight side water tank, and an electric regulating valve located at the bottom of the counterweight side water tank.

[0010] The reversible water pump turbine unit is connected to the electric regulating valve via a water pipe, and the control cabinet is connected to the car-side measuring unit, the reversible water pump turbine unit, the counterweight-side measuring unit, and the electric regulating valve.

[0011] Compared with the prior art, the beneficial effects of the hostless elevator drive device of the present invention are as follows: by using a reversible water pump turbine unit and an electric regulating valve to adjust the water volume difference between the car-side water tank and the counterweight-side water tank, the elevator can be driven by gravity without the need for a traction machine to overcome unbalanced forces and friction, and without the need for a host machine to drive the traction machine, which can reduce energy consumption and avoid the problem of a large space occupied by a host machine.

[0012] Optionally, the car-side measurement unit includes a car-side pressure sensor and a car-side water level sensor; the car-side pressure sensor is located on the bottom surface of the car-side water tank, and the car-side water level sensor is located on the side surface inside the car-side water tank.

[0013] Optionally, the counterweight side measuring unit includes a counterweight side pressure sensor and a counterweight side water level sensor; the counterweight side pressure sensor is located on the bottom surface of the counterweight side water tank, and the counterweight side water level sensor is located on the side surface inside the counterweight side water tank.

[0014] A hostless elevator drive method is also provided, applied to the aforementioned hostless elevator drive device, comprising:

[0015] The real-time operating mode and real-time operating speed of the elevator are obtained; the target speed curve of the elevator is determined based on the real-time operating mode; and the speed deviation between the real-time operating speed and the target speed curve is determined based on the real-time operating speed and the target speed curve.

[0016] The car-side mass and the car-side water volume in the car-side water tank are obtained through the car-side measuring unit, and the counterweight-side mass and the counterweight-side water volume in the counterweight-side water tank are obtained through the counterweight-side measuring unit.

[0017] Based on the car-side mass, the car-side water volume, the counterweight-side mass, the counterweight-side water volume, and the speed deviation, the water level deviation between the car-side water tank and the counterweight-side water tank is determined, and the target rotational speed and target opening are determined based on the water level deviation.

[0018] The operation mode of the reversible pump-turbine unit is controlled according to the water level deviation, the reversible pump-turbine unit is controlled according to the target speed, and the electric regulating valve is controlled according to the target opening degree to drive the elevator.

[0019] Optionally, the real-time operation mode includes a long-distance operation mode and a short-distance operation mode;

[0020] Determining the target speed curve of the elevator based on the real-time operation mode includes:

[0021] When the real-time operation mode is the long-distance operation mode, the target speed curve includes an acceleration phase, a constant speed phase, and a deceleration phase.

[0022] When the real-time operation mode is the short-distance operation mode, the target speed curve includes an acceleration phase and a deceleration phase.

[0023] Optionally, the real-time running speed has a corresponding real-time running time;

[0024] Based on the real-time operating speed and the target speed curve, the speed deviation between the real-time operating speed and the target speed curve is determined, including:

[0025] Based on the real-time running time, determine the target running speed corresponding to the target speed curve;

[0026] The speed deviation is determined based on the real-time operating speed and the target operating speed.

[0027] Optionally, the water level deviation between the car-side water tank and the counterweight-side water tank is determined based on the car-side mass, the car-side water volume, the counterweight-side mass, the counterweight-side water volume, and the speed deviation, including:

[0028] The water volume difference is determined based on the water volume on the car side and the water volume on the counterweight side;

[0029] The mass difference is determined based on the car side mass and the counterweight side mass;

[0030] Based on the speed deviation, the mass deviation between the car drive module and the counterweight drive module is determined;

[0031] The water level deviation with direction is determined based on the water volume difference and the mass deviation.

[0032] Optionally, determining the target rotational speed and target opening degree based on the water level deviation includes:

[0033] The required elevator driving force is determined based on the water volume difference.

[0034] Based on the water level deviation and the required elevator driving force, determine the target rotation speed and target opening.

[0035] Optionally, the operating mode of the reversible pump-turbine unit is controlled according to the water level deviation, including:

[0036] When the direction of the water level deviation is from water being sent from the car-side water tank to the counterweight-side water tank, the operating mode of the reversible pump-turbine unit is controlled to be the power-consuming pump mode.

[0037] Optionally, the operating mode of the reversible pump-turbine unit is controlled according to the water level deviation, including:

[0038] When the direction of the water level deviation is from water being sent from the counterweight side water tank to the car side water tank, the operating mode of the reversible pump-turbine unit is controlled as a turbine mode that converts hydraulic kinetic energy into electrical energy. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the elevator drive device of the present invention;

[0040] The attached diagram shows the following reference numerals: 1. Control cabinet; 2. Car drive module; 201. Car-side water tank; 202. Car-side measuring unit; 2021. Car-side pressure sensor; 2022. Car-side water level sensor; 203. Reversible pump-turbine unit; 3. Counterweight drive module; 301. Counterweight-side water tank; 302. Counterweight-side measuring unit; 3021. Counterweight-side pressure sensor; 3022. Counterweight-side water level sensor; 303. Electric regulating valve; 4. Traction sheave; 5. Wire rope; 6. Car; 7. Water pipe. Detailed Implementation

[0041] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0042] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] See Figure 1 As shown, a hostless elevator drive device of the present invention includes: a control cabinet 1, a car drive module 2 and a counterweight drive module 3. The car drive module 2 is connected to the counterweight drive module 3 through a traction sheave 4 and a steel wire rope 5. The traction sheave 4 is located at the top of the shaft. This structure is consistent with that of a conventional elevator and will not be described in detail here. In one embodiment of the present invention, a braking module is provided on the traction sheave 4, and the traction sheave 4 is a driven sheave, which only plays the functions of stopping, guiding and reversing, without the need for a host drive, effectively reducing the space occupied by the host.

[0044] The car drive module 2 includes a car-side water tank 201 located at the bottom of the car 6, a car-side measuring unit 202 located inside the car-side water tank 201, and a reversible water pump turbine unit 203 located at the bottom of the car-side water tank 201; the counterweight drive module 3 includes a counterweight-side water tank 301, a counterweight-side measuring unit 302 located inside the counterweight-side water tank 301, and an electric regulating valve 303 located at the bottom of the counterweight-side water tank 301; the reversible water pump turbine unit 203 is connected to the electric regulating valve 303 via a water pipe 7, and the control cabinet 1 is connected to the car-side measuring unit 202, the reversible water pump turbine unit 203, the counterweight-side measuring unit 302, and the electric regulating valve 303.

[0045] This invention uses water (dynamically adjustable liquid) in the car-side water tank 201 and the counterweight-side water tank 301 as a medium for balancing and mass transfer. The flow direction of this medium is controlled by a reversible water pump turbine unit 203, thereby adjusting the water volume difference between the car-side water tank 201 and the counterweight-side water tank 301 to drive the elevator by gravity. Furthermore, the flow velocity of this medium is adjusted by regulating the speed of the reversible water pump turbine unit 203 and the opening of the electric regulating valve 303 to ensure the stable operation of the car 6 when driving the elevator.

[0046] In one embodiment of the present invention, the car-side measuring unit 202 includes a car-side pressure sensor 2021 and a car-side water level sensor 2022; the car-side pressure sensor 2021 is disposed on the bottom surface of the car-side water tank 201, and the car-side water level sensor 2022 is disposed on the side surface inside the car-side water tank 201.

[0047] The car-side pressure sensor 2021, located on the bottom surface of the car-side water tank 201, is used to obtain the car-side mass. The car-side water level sensor 2022, located on the inner side of the car-side water tank 201, is used to obtain the car-side water level. The volume of the car-side water, which is the flowable medium in the car-side water tank 201, is obtained based on the bottom area of ​​the car-side water tank 201 and the car-side water level.

[0048] In one embodiment of the present invention, the counterweight side measurement unit 302 includes a counterweight side pressure sensor 3021 and a counterweight side water level sensor 3022; the counterweight side pressure sensor 3021 is disposed on the bottom surface of the counterweight side water tank 301, and the counterweight side water level sensor 3022 is disposed on the side surface inside the counterweight side water tank 301.

[0049] The counterweight side mass is obtained by the counterweight side pressure sensor 3021 located on the bottom surface of the counterweight side water tank 301, and the counterweight side water level is obtained by the counterweight side water level sensor 3022 located on the inner side of the counterweight side water tank 301. The counterweight side water volume of the flowable medium in the counterweight side water tank 301 is obtained based on the bottom area of ​​the counterweight side water tank 301 and the counterweight side water level.

[0050] The elevator drive device of the present invention adjusts the water volume difference between the car-side water tank 201 and the counterweight-side water tank 301 through a reversible water pump turbine unit 203 and an electric regulating valve 303, so as to realize the elevator driven by gravity without the need for the traction machine to overcome unbalanced forces and friction, and without the need for the main unit to drive the traction machine, which can reduce energy consumption and avoid the problem of the main unit occupying a large space.

[0051] The present invention provides a hostless elevator drive method, applied to the aforementioned hostless elevator drive device, comprising:

[0052] S1: Obtain the elevator's real-time operating mode and real-time operating speed, determine the elevator's target speed curve based on the real-time operating mode, and determine the speed deviation between the real-time operating speed and the target speed curve based on the real-time operating speed and the target speed curve.

[0053] In one embodiment of the present invention, the real-time operation mode includes a long-distance operation mode and a short-distance operation mode; determining the target speed curve of the elevator according to the real-time operation mode includes: when the real-time operation mode is a long-distance operation mode, the target speed curve includes an acceleration phase, a constant speed phase and a deceleration phase; when the real-time operation mode is a short-distance operation mode, the target speed curve includes an acceleration phase and a deceleration phase.

[0054] Taking an elevator with a travel distance of 10m (long distance) and a rated speed of 1m / s as an example, the corresponding real-time operating mode is the long-distance operating mode, based on the elevator travel distance, rated speed, and acceleration of 0.25m / s² during acceleration and deceleration phases. 2 The time periods and distances corresponding to the acceleration phase, constant speed phase, and deceleration phase in the target speed curve are determined respectively, as follows:

[0055] Acceleration phase: Starting from 0, the acceleration is 0.25 m / s². 2 Accelerating to the rated speed of 1m / s takes 0-4s and covers a distance of 2m.

[0056] Constant speed phase: Maintain the rated speed of 1m / s for a period of 4-10s, corresponding to a running distance of 6m;

[0057] Deceleration phase: Starting from the rated speed of 1 m / s, the acceleration is 0.25 m / s². 2The time interval for decelerating to 0 is 10-14 seconds, and the corresponding running distance is 2 meters.

[0058] Taking an elevator with a travel distance of 4m (short distance) and a rated speed of 1m / s as an example, the corresponding real-time operating mode is the short-distance operating mode, based on the elevator travel distance, rated speed, and acceleration of 0.25m / s² during both acceleration and deceleration phases. 2 The time periods and distances corresponding to the acceleration and deceleration phases in the target speed curve are determined separately, as follows:

[0059] Acceleration phase: Starting from 0, the acceleration is 0.25 m / s². 2 Accelerating to the rated speed of 1m / s takes 0-4s and covers a distance of 2m.

[0060] Deceleration phase: Starting from the rated speed of 1 m / s, the acceleration is 0.25 m / s². 2 The time interval for decelerating to 0 is 4-8 seconds, and the corresponding running distance is 2 meters.

[0061] In one embodiment of the present invention, the real-time running speed has a corresponding real-time running time; determining the speed deviation between the real-time running speed and the target speed curve based on the real-time running speed and the target speed curve includes: determining the target running speed corresponding to the target speed curve based on the real-time running time; and determining the speed deviation based on the real-time running speed and the target running speed.

[0062] Taking the target speed curve corresponding to the above long-distance operation mode (elevator travel distance is 10m) as an example, assuming the real-time operating speed is 0.7m / s and the real-time operating time corresponding to the real-time operating speed is the 4th second, then the target operating speed is 1m / s, and the corresponding speed deviation is 1m / s-0.7m / s=0.3m / s.

[0063] S2: The car-side mass and the car-side water volume in the car-side water tank 201 are obtained through the car-side measuring unit 202, and the counterweight-side mass and the counterweight-side water volume in the counterweight-side water tank 301 are obtained through the counterweight-side measuring unit 302; specifically, the car-side mass is obtained through the car-side pressure sensor 2021, which is the sum of the masses of the car 6 and the car-side water tank 201; the counterweight-side mass is obtained through the counterweight-side pressure sensor 3021, which is the sum of the masses of the counterweight-side water tank 301. 01. Mass; The water level in the car-side water tank 201 is obtained by the car-side water level sensor 2022, and the volume of the flowable medium in the car-side water tank 201 is obtained based on the bottom area of ​​the car-side water tank 201 and the car-side water level; The counterweight side water level in the counterweight side water tank 301 is obtained by the counterweight side water level sensor 3022, and the volume of the flowable medium in the counterweight side water tank 301 is obtained based on the bottom area of ​​the counterweight side water tank 301 and the counterweight side water level.

[0064] S3: Based on the car-side mass, car-side water volume, counterweight-side mass, counterweight-side water volume, and speed deviation, determine the water level deviation between the car-side water tank 201 and the counterweight-side water tank 301, and determine the target speed and target opening based on the water level deviation.

[0065] In one embodiment of the present invention, the water level deviation between the car-side water tank 201 and the counterweight-side water tank 301 is determined based on the car-side mass, car-side water volume, counterweight-side mass, counterweight-side water volume, and speed deviation. This includes: determining the water volume difference based on the car-side water volume and the counterweight-side water volume; determining the mass difference based on the car-side mass and the counterweight-side mass; determining the mass deviation between the car drive module 2 and the counterweight drive module 3 based on the speed deviation; and determining the directional water level deviation based on the water volume difference and the mass deviation.

[0066] In one embodiment of the present invention, an outer-loop PID is used to determine the water level deviation, and the calculation formula of the outer-loop PID is as follows:

[0067]

[0068]

[0069] in, For water level deviation, , , The PID parameters for the outer loop PID control are, specifically, the speed loop proportional gain. ,integral Differential gain , For speed deviation, For the target running speed, For real-time running speed.

[0070] In one embodiment of the present invention, determining the target rotational speed and target opening based on the water level deviation includes: determining the required elevator driving force based on the water volume difference; and determining the target rotational speed and target opening based on the water level deviation and the required elevator driving force.

[0071] In one embodiment of the present invention, the required elevator driving force is determined by the gravitational potential energy difference and frictional losses, and the formula for calculating the required elevator driving force is as follows:

[0072]

[0073]

[0074] in, For the required elevator driving force; The density of the flowable medium in the car-side water tank 201 and the counterweight-side water tank 301, in units of... ; This is the acceleration due to gravity, with units of 1. ; For water volume difference; This refers to the water volume on the side of the car. For the volume of water on the counterweight side; This refers to the frictional force caused by frictional losses.

[0075] friction It can be calculated using the following two methods:

[0076] 1) It is obtained by detecting acceleration, and the calculation formula is as follows:

[0077]

[0078] 2) Calculated using the water volume difference under unbalanced conditions, the calculation formula is as follows:

[0079]

[0080] During elevator operation, the dynamic model expression of the elevator is as follows:

[0081]

[0082]

[0083] in, Car side mass, in units ; For the weighted mass, the unit is... ; It is the total volume of all flowable media in the elevator drive unit, specifically the sum of the water volume on the car side and the water volume on the counterweight side; This refers to the water volume on the side of the car. For the volume of water on the counterweight side; This refers to the displacement of the elevator car, specifically the distance the elevator travels. Let be the cross-sectional area of ​​water pipe 7; The difference between the water levels in the car-side water tank 201 and the counterweight-side water tank 301; is the damping coefficient, used to represent the frictional damping of the elevator.

[0084] In one embodiment of the present invention, an inner-loop PID controller is used to determine the target rotational speed and the target opening degree. The calculation formula for the inner-loop PID controller is as follows:

[0085]

[0086]

[0087] in, For the target rotational speed and target opening, , , The PID parameters for the inner loop PID control are, specifically, the speed loop proportional gain. ,integral Differential gain , To determine the target water level deviation, the reversible pump-turbine unit 203 adjusts the flow direction of the flowable medium, ensuring that the difference in flowable medium between the car-side water tank 201 and the counterweight-side water tank 301 represents the target water level deviation. This, in turn, enables gravity-driven elevator operation. For water level deviation, This refers to the actual water level deviation, specifically the difference in water level between the car-side water tank 201 and the counterweight-side water tank 301.

[0088] S4: Control the operation mode of the reversible pump turbine unit 203 according to the water level deviation, control the reversible pump turbine unit 203 according to the target speed, control the electric regulating valve 303 according to the target opening degree, and drive the elevator to run.

[0089] In one embodiment of the present invention, the operation mode of the reversible pump-turbine unit 203 is controlled according to the water level deviation, including: when the direction of the water level deviation is from water supply from the car side water tank 201 to the counterweight side water tank 301, the operation mode of the reversible pump-turbine unit 203 is controlled to be the pump mode that consumes electrical energy.

[0090] In one embodiment of the present invention, the operation mode of the reversible pump-turbine unit 203 is controlled according to the water level deviation, including: when the direction of the water level deviation is from water being sent from the counterweight side water tank 301 to the car side water tank 201, the operation mode of the reversible pump-turbine unit 203 is controlled to be a turbine mode that converts hydraulic kinetic energy into electrical energy.

[0091] The elevator driving method will be explained next:

[0092] When a passenger enters the car 6, the car-side pressure sensor 2021 acquires the car-side mass, which is the sum of the car mass, the car-side water tank 201 mass, and the passenger mass.

[0093] The acceleration phase driving process is as follows:

[0094] Water level deviation is determined using an outer-loop PID controller: target operating speed Accelerating from 0, the speed deviation at this point Calculate the positive value This is used to indicate that the water in the car-side water tank 201 needs to be transferred to the counterweight-side water tank 301 so that the counterweight-side water tank 301 becomes heavier.

[0095] The target rotational speed and target opening degree are determined using an inner-loop PID controller: actual water level deviation. The deviation is 0 (maintaining balance), at which point the target water level deviation is... Inner loop PID output control quantity The reversible pump-turbine unit 203 is controlled to operate in power-consuming pump mode, delivering the flowable medium from the car-side water tank 201 to the counterweight-side water tank 301. At this time, the actual water level deviation is... It begins to grow.

[0096] Based on the elevator dynamics model and the calculation formula for the required elevator driving force, it can be known that the actual water level deviation... This will generate elevator driving force, causing the elevator to accelerate upwards according to the target speed curve.

[0097] The driving process during the constant speed phase is as follows:

[0098] The water level deviation is determined using an outer-loop PID controller: Stable operation needs to be maintained at this point, therefore the output... Used to eliminate the friction generated during elevator operation.

[0099] The target speed and target opening are determined by using an inner-loop PID controller: maintain the current speed and opening to keep the water level difference between the car-side water tank 201 and the counterweight-side water tank 301 stable.

[0100] The driving process during the deceleration phase is as follows:

[0101] Water level deviation is determined using an outer-loop PID controller: target operating speed Start decelerating to 0. At this point, the speed deviation... Calculate the negative value A negative value indicates that the unbalanced forces on the car side and the counterweight side need to be reduced at this time.

[0102] The target speed and target opening degree are determined using an inner-loop PID controller. The inner loop PID outputs a reverse control quantity to control the reversible water pump turbine unit 203 to operate in a water turbine mode that converts hydraulic kinetic energy into electrical energy, and to send the flowable medium from the counterweight side water tank 301 to the car side water tank 201 to precisely decelerate and achieve a smooth stop for the elevator.

[0103] In one embodiment of the present invention, the control cabinet 1 is further used to monitor the inconsistency between the rate of change of the water level difference between the car-side water tank 201 and the counterweight-side water tank 301 and the flow rate of the reversible pump-turbine unit 203 to determine whether there is a leak, including:

[0104] Let the flow rate of the reversible pump-turbine unit 203 be... Theoretically, the rate of change of the water level difference between the car-side water tank 201 and the counterweight-side water tank 301 should be related to the flow rate of the reversible pump-turbine unit 203, and the expression between the two is as follows:

[0105]

[0106] in, The rate of change of water level difference between the car-side water tank 201 and the counterweight-side water tank 301. For the reversible pump-turbine unit 203 flow rate, The cross-sectional area of ​​water pipe 7 is given. If the rate of change of the water level difference between the car-side water tank 201 and the counterweight-side water tank 301 and the deviation of the flow rate of the reversible water pump turbine unit 203 exceeds a preset threshold, a water leakage alarm will be triggered.

[0107] In one embodiment of the present invention, an acceleration sensor for measuring the elevator's running acceleration is also included. The control cabinet 1 is also used to monitor whether the elevator's running acceleration exceeds a preset safety threshold. If it does, the elevator's emergency protection measures are triggered.

[0108] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hostless elevator drive method, characterized in that, An elevator drive system without a mainframe is disclosed. The elevator drive system includes a control cabinet, a car drive module, and a counterweight drive module. The car drive module is connected to the counterweight drive module via a traction sheave and steel cables. The car drive module includes a car-side water tank located at the bottom of the car, a car-side measuring unit located within the car-side water tank, and a reversible pump-turbine unit located at the bottom of the car-side water tank. The counterweight drive module includes a counterweight-side water tank, a counterweight-side measuring unit located within the counterweight-side water tank, and an electrically adjustable valve located at the bottom of the counterweight-side water tank. The reversible pump-turbine unit is connected to the electrically adjustable valve via water pipes. The control cabinet is connected to the car-side measuring unit, the reversible pump-turbine unit, the counterweight-side measuring unit, and the electrically adjustable valve. The method includes: The system acquires the elevator's real-time operating mode and real-time operating speed, determines the elevator's target speed curve based on the real-time operating mode, and determines the speed deviation between the real-time operating speed and the target speed curve based on the real-time operating speed and the target speed curve; the real-time operating mode includes a long-distance operating mode and a short-distance operating mode. The car-side mass and the car-side water volume in the car-side water tank are obtained through the car-side measuring unit, and the counterweight-side mass and the counterweight-side water volume in the counterweight-side water tank are obtained through the counterweight-side measuring unit. Based on the car-side mass, the car-side water volume, the counterweight-side mass, the counterweight-side water volume, and the speed deviation, the water level deviation between the car-side water tank and the counterweight-side water tank is determined, and the target rotational speed and target opening are determined based on the water level deviation. The operation mode of the reversible pump-turbine unit is controlled according to the water level deviation, the reversible pump-turbine unit is controlled according to the target speed, and the electric regulating valve is controlled according to the target opening degree to drive the elevator. The real-time running speed has a corresponding real-time running time; determining the speed deviation between the real-time running speed and the target speed curve based on the real-time running speed and the target speed curve includes: determining the target running speed corresponding to the target speed curve based on the real-time running time; and determining the speed deviation based on the real-time running speed and the target running speed. The water level deviation between the car-side water tank and the counterweight-side water tank is determined based on the car-side mass, the car-side water volume, the counterweight-side mass, the counterweight-side water volume, and the speed deviation. This includes: determining the water volume difference based on the car-side water volume and the counterweight-side water volume; determining the mass difference based on the car-side mass and the counterweight-side mass; determining the mass deviation between the car drive module and the counterweight drive module based on the speed deviation; and determining the directional water level deviation based on the water volume difference and the mass deviation. Determining the target rotational speed and target opening based on the water level deviation includes: determining the required elevator driving force based on the water volume difference; and determining the target rotational speed and target opening based on the water level deviation and the required elevator driving force.

2. The hostless elevator drive method according to claim 1, characterized in that, The car-side measurement unit includes a car-side pressure sensor and a car-side water level sensor; the car-side pressure sensor is located on the bottom surface of the car-side water tank, and the car-side water level sensor is located on the side surface inside the car-side water tank.

3. The hostless elevator drive method according to claim 1, characterized in that, The counterweight side measurement unit includes a counterweight side pressure sensor and a counterweight side water level sensor; the counterweight side pressure sensor is located on the bottom surface of the counterweight side water tank, and the counterweight side water level sensor is located on the side surface inside the counterweight side water tank.

4. The hostless elevator drive method according to claim 1, characterized in that, Determining the target speed curve of the elevator based on the real-time operation mode includes: When the real-time operation mode is the long-distance operation mode, the target speed curve includes an acceleration phase, a constant speed phase, and a deceleration phase. When the real-time operation mode is the short-distance operation mode, the target speed curve includes an acceleration phase and a deceleration phase.

5. The hostless elevator drive method according to claim 1, characterized in that, The operating mode of the reversible pump-turbine unit is controlled according to the water level deviation, including: When the direction of the water level deviation is from water being sent from the car-side water tank to the counterweight-side water tank, the operating mode of the reversible pump-turbine unit is controlled to be the power-consuming pump mode.

6. The hostless elevator drive method according to claim 1, characterized in that, The operating mode of the reversible pump-turbine unit is controlled according to the water level deviation, including: When the direction of the water level deviation is from water being sent from the counterweight side water tank to the car side water tank, the operating mode of the reversible pump-turbine unit is controlled as a turbine mode that converts hydraulic kinetic energy into electrical energy.

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