Energy-saving control method for elevator

Abstract

The invention relates to the field of elevators, in particular to an elevator energy-saving control method which comprises the following steps that a pressure sensor monitors the load condition of an elevator in real time and transmits the load condition to a microprocessor; a rotating speed sensor on an elevator traction machine and a position sensor in an elevator hoistway monitor the running speed and position information of an elevator in real time and transmit the information to a microprocessor; the microprocessor sends the load condition information, the running speed information and the position information to the speed adjusting module and the energy feedback control module respectively; the speed adjusting module controls the rotating speed of a driving motor of the elevator traction machine according to the received information of the microprocessor so as to adjust the running speed of the elevator; the energy feedback control module determines whether to start the energy feedback device or not according to the received information sent by the microprocessor, and when the elevator is in a braking or descending state and the load reaches a certain threshold value, the energy feedback device is started; and when the elevator is in a rising state or the load is light, the energy feedback device is closed.

Description

Technical Field

[0001] The present invention relates to the field of elevators and relates to an energy-saving control method for elevators. Background Art

[0002] With the acceleration of the urbanization process, elevators, as indispensable vertical transportation tools in modern buildings, are increasing in number. The frequent use of elevators has led to a large amount of energy consumption. How to improve the energy utilization efficiency of elevators has become an urgent problem to be solved. In the braking and descending processes of traditional elevators, mechanical energy is usually converted into heat energy and consumed, which not only wastes energy but also may increase the heat dissipation burden of the elevator machine room. In addition, the existing operating speed of elevators is often fixed and does not fully consider the actual load and operating status of the elevators, resulting in low energy utilization efficiency. Therefore, it is of great practical significance to develop an energy-saving control method that can convert the mechanical energy generated during the braking and descending processes of elevators into electrical energy and feed it back to the power grid, and at the same time adjust the operating speed in real time in combination with the actual load and operating status of the elevators. Summary of the Invention

[0003] The present invention provides an energy-saving control method for elevators to solve the problems of the prior art.

[0004] The object of the present invention can be achieved by the following technical solutions:

[0005] An energy-saving control method for elevators includes the following steps:

[0006] S1: Real-time monitor the load condition of the elevator through the pressure sensor at the bottom of the elevator car and transmit the above load condition information to the microprocessor of the elevator control system;

[0007] S2: Real-time monitor the operating speed and position information of the elevator through the rotational speed sensor on the elevator traction machine and the position sensor in the elevator hoistway, and transmit the above information to the microprocessor of the elevator control system;

[0008] S3: The microprocessor of the elevator control system separately sends the load condition information, operating speed information and position information to the speed adjustment module and the energy feedback control module;

[0009] S4: The speed adjustment module controls the rotational speed of the drive motor of the elevator traction machine according to the information sent by the microprocessor to adjust the operating speed of the elevator in real time;

[0010] S5: The energy feedback control module decides whether to start the energy feedback device according to the information sent by the microprocessor. When the elevator is in the braking or descending state and the load reaches a certain threshold, start the energy feedback device to convert the mechanical energy generated by the elevator into electrical energy and feed it back to the power grid; when the elevator is in the ascending state or the load is light, turn off the energy feedback device.

[0011] For further improvement, in step S1, when the pressure sensor measures the load condition, if the load reaches 30% or more of the elevator's rated load, it is determined as a heavy load; if it is less than 30%, it is determined as a light load. In step S4, when the elevator speed change rate exceeds 0.3 m / s 2 it is determined as an accelerating or decelerating state, and when the speed is stable within the range of ±5% of the rated speed, it is determined as a constant-speed running state. For an elevator with a rated speed of 2 m / s, when descending with a light load, the speed can be increased to 2.2 - 2.4 m / s, and when ascending with a heavy load, the speed can be reduced to 1.8 - 1.9 m / s. In step S5, when the elevator is in the braking or descending state and the load reaches 20% of the rated load, the energy feedback device is started.

[0012] For further improvement, the energy feedback device includes an inverter, a filter, and a controller. The inverter is used to convert the DC electric energy generated during the elevator braking and descending processes into AC electric energy with the same frequency and phase as the power grid. The filter is used to filter the converted AC electric energy to remove the harmonic components therein. The controller is used to monitor and control the working state of the energy feedback device.

[0013] For further improvement, in step S3, after the microprocessor of the elevator control system receives the load information, running speed information, and position information, the above information is stored through the storage module, and the storage time is not less than 30 days.

[0014] For further improvement, in step S5, after the energy feedback device is started, if it is detected that the instantaneous voltage fluctuation of the power grid exceeds ±15%, the energy feedback control module automatically suspends the energy feedback and restarts the energy feedback within 5 seconds after the power grid voltage returns to normal.

[0015] For further improvement, in step S4, when the speed adjustment module adjusts the elevator running speed, it feeds back the speed adjustment result to the microprocessor of the elevator control system every time the speed is adjusted. If the speed adjustment errors continuously feedback three times and exceed ±0.1 m / s, the microprocessor triggers a fault alarm.

[0016] For further improvement, before the elevator starts running for the first time every day, the system automatically conducts self-checks on the pressure sensor, speed sensor, and position sensor. The self-check process is to input an analog signal to the sensor and detect whether the sensor output is within the preset error range. If any sensor fails the self-check, the elevator operation is prohibited, and an alarm prompt is issued in the elevator car and the monitoring room.

[0017] For further improvement, the controller in the energy feedback device includes a remote communication module, and information such as the working status and power conversion data of the energy feedback device is transmitted to the remote monitoring center in real time through the wireless communication module in the remote communication module.

[0018] Compared with the prior art, the beneficial effects of the elevator energy-saving control method of the present invention are as follows:

[0019] The load condition, running speed and position information of the elevator are respectively collected in real time by the pressure sensor, speed sensor and position sensor and transmitted to the microprocessor. The microprocessor distributes this information to the speed adjustment module and the energy feedback control module. The speed adjustment module adjusts the running speed of the elevator accordingly, and the energy feedback control module decides whether to start the energy feedback device, thus building a basic elevator energy-saving control framework, realizing real-time monitoring of the elevator running state and preliminary energy-saving regulation, and laying a foundation for subsequent more refined control strategies. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the control flow of the present invention DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] The following combines the embodiments and the attached Figure 1 drawings to further elaborate on the technical solutions of the present invention.

[0024] Embodiment 1

[0025] An elevator energy-saving control method includes the following steps:

[0026] S1: The load condition of the elevator is monitored in real time through the pressure sensor at the bottom of the elevator car, and the above load condition information is transmitted to the microprocessor of the elevator control system;

[0027] S2: The running speed and position information of the elevator are monitored in real time through the speed sensor on the elevator traction machine and the position sensor in the elevator hoistway, and the above information is transmitted to the microprocessor of the elevator control system;

[0028] S3: The microprocessor of the elevator control system separately sends the load condition information, running speed information, and position information to the speed adjustment module and the energy feedback control module;

[0029] S4: The speed adjustment module controls the rotation speed of the drive motor of the elevator traction machine according to the information sent by the received microprocessor to adjust the running speed of the elevator in real time;

[0030] S5: The energy feedback control module decides whether to start the energy feedback device according to the information sent by the received microprocessor. When the elevator is in the braking or descending state and the load reaches a certain threshold, the energy feedback device is started to convert the mechanical energy generated by the elevator into electrical energy and feed it back to the power grid; when the elevator is in the ascending state or the load is light, the energy feedback device is turned off.

[0031] The load condition, running speed, and position information of the elevator are respectively collected in real time through the pressure sensor, speed sensor, and position sensor, and transmitted to the microprocessor. The microprocessor distributes this information to the speed adjustment module and the energy feedback control module. The speed adjustment module adjusts the running speed of the elevator accordingly, and the energy feedback control module decides whether to start the energy feedback device, constructing a basic elevator energy-saving control framework, realizing the real-time monitoring of the elevator operation state and the preliminary energy-saving regulation, and laying a foundation for subsequent more refined control strategies.

[0032] As a further preferred embodiment, in step S1, the load condition of the elevator is monitored in real time through the pressure sensor at the bottom of the elevator car, and the above load condition information is transmitted to the microprocessor of the elevator control system; specifically, let the rated load of the elevator be m1, and the currently monitored load mass be m. When m / m1≥0.3, when the load reaches 30% or more of the elevator's rated load, it is determined as a heavy load; when m / m1<0.3, when it is less than 30%, it is determined as a light load;

[0033] Embodiment A: It is set that when the load reaches 20% or more of the elevator's rated load, it is determined as a heavy load, and when it is less than 20%, it is determined as a light load. In a one-month test cycle, for the elevator in a certain high-rise office building, a total of 10,000 operation times were recorded. After statistics, the elevator energy consumption is about 5,150 degrees. Due to the low threshold for determining heavy loads, many situations that could have run efficiently with light loads were misjudged, resulting in deviations in speed adjustment and energy feedback decisions, and starting unnecessary energy-saving measures too much, which instead increased the system energy consumption.

[0034] Example B: It is determined that the load is a heavy load when it reaches 40% or more of the rated load of the elevator, and a light load when it is less than 40%. Similarly, within the same test cycle in this office building, the elevator runs 10,000 times, and the energy consumption is about 4,820 degrees. However, it is found in actual operation that for some cases with a load between 30% - 40%, when operating as a light load, the operating efficiency of the elevator decreases during heavy load periods, the waiting time of passengers prolongs, and the energy-saving effect is not good when some heavy loads are running.

[0035] Example of this patent: It is determined that the load is a heavy load when it reaches 30% or more of the rated load of the elevator, and a light load when it is less than 30%. For the elevator in this office building under the same test cycle and number of operations, the energy consumption is reduced to 4,530 degrees. This setting can more accurately balance the judgment of light and heavy loads, enabling the subsequent energy-saving strategy to be effectively implemented, while improving the operating efficiency and reducing the energy consumption.

[0036] The 30% load determination threshold set in this patent can perform best in balancing the operating efficiency and energy-saving effect, effectively reducing the energy consumption while ensuring the passenger experience.

[0037] In step S4, the running speed and position information of the elevator are real-time monitored through the speed sensor on the elevator traction machine and the position sensor in the elevator hoistway, and the above information is transmitted to the microprocessor of the elevator control system. Specifically, let the speed of the elevator at time t1 be v1 and the speed at time t2 be v2, then the speed change rate a = (v2 - v1) / (t2 - t1). When ∣a∣ > 0.3m / s 2 it is determined to be in an accelerating or decelerating state. When the elevator speed v satisfies va(1 - 0.05) ≤ v ≤ va(1 + 0.05), it is determined to be in a uniform running state, where va is the rated speed of the elevator. When the speed is stable within the range of ±5% of the rated speed, it is determined to be in a uniform running state. For an elevator with a rated speed of va = 2m / s, when the load is light and descending, the speed can be increased to 2.2 - 2.4m / s, and when the load is heavy and ascending, the speed can be reduced to 1.8 - 1.9m / s;

[0038] Example C: When the elevator speed change rate exceeds 0.2m / s 2 it is determined to be in an accelerating or decelerating state. When the speed is stable within the range of ±3% of the rated speed, it is determined to be in a uniform running state. In the elevator test in a certain residential community, it runs 8,000 times within a month, and the energy consumption is about 3,850 degrees. However, due to the relatively low determination threshold of the speed change rate, the accelerating and decelerating states are frequently misjudged, resulting in the frequent operation of the speed adjustment module, affecting the running smoothness of the elevator and increasing the energy consumption.

[0039] Example D: When the elevator speed change rate exceeds 0.4m / s 2It is determined as an accelerating or decelerating state when [condition], and is determined as a uniform running state when the speed is stable within the range of rated speed ±7%. The elevator in this community runs 8,000 times in the same test cycle, and the energy consumption is about 4,130 degrees. Due to the too high determination threshold of the speed change rate, some accelerating and decelerating states cannot be recognized in time, the speed adjustment lags behind, and the judgment of the uniform state is also relatively loose, so the energy-saving speed cannot be accurately matched, resulting in an increase in energy consumption.

[0040] In the embodiment of this patent: when the elevator speed change rate exceeds 0.3m / s 2 it is determined as an accelerating or decelerating state, and is determined as a uniform running state when the speed is stable within the range of rated speed ±5%. Under this setting, for the elevator in this community, with the same test cycle and number of runs, the energy consumption is reduced to about 3,670 degrees. It can accurately judge the running state of the elevator, make the speed adjustment module work reasonably, ensure the stable operation of the elevator while reducing energy consumption.

[0041] The elevator speed change rate exceeds 0.3m / s 2 it is determined as an accelerating or decelerating state, and when the speed is stable within the range of rated speed ±5%, a better balance between energy saving and running stability can be achieved.

[0042] Embodiment E: For an elevator with a rated speed of 2m / s, when the load is light and descending, the speed is increased to 2.0 - 2.1m / s, and when the load is heavy and ascending, the speed is reduced to 1.9 - 1.95m / s. In the elevator test of a certain commercial complex, it runs 12,000 times in a month, and the energy consumption is about 6,220 degrees. The amplitude of speed increase and decrease is small, and the energy-saving effect is not significant. Especially when the load is light and descending, the energy-saving space is not fully utilized, and more energy is still consumed when the load is heavy and ascending.

[0043] Embodiment F: When the load is light and descending, the speed is increased to 2.5 - 2.6m / s, and when the load is heavy and ascending, the speed is reduced to 1.6 - 1.7m / s. The elevator in this commercial complex runs 12,000 times in the same test cycle, and the energy consumption is about 6,060 degrees. However, the speed increase when the load is light and descending is too high, affecting the comfort of passengers, and the speed reduction when the load is heavy and ascending is too low, prolonging the running time, and the overall comprehensive effect is not good.

[0044] In the embodiment of this patent: when the load is light and descending, the speed can be increased to 2.2 - 2.4m / s, and when the load is heavy and ascending, the speed can be reduced to 1.8 - 1.9m / s. Under this setting, the elevator in this commercial complex runs 12,000 times in a month, and the energy consumption is reduced to 5,880 degrees.

[0045] When the load is light and descending, the speed can be increased to 2.2 - 2.4m / s, and when the load is heavy and ascending, the speed can be reduced to 1.8 - 1.9m / s. While ensuring the comfort of passengers, it has a good energy-saving effect.

[0046] In step S5, the speed adjustment module controls the rotational speed of the drive motor of the elevator traction machine according to the information sent by the microprocessor it receives to adjust the running speed of the elevator in real time. Specifically, the formula for the speed adjustment module to determine the optimal running speed vb of the elevator based on the load condition and running state is: vb = va×(k1×m / m1 + k2×s), where va is the rated speed of the elevator, m is the current load mass of the elevator, m1 is the rated load mass of the elevator, s is the running state coefficient. When the elevator is in the acceleration state, s = 1.1; when in the deceleration state, s = 0.9; when in the constant speed state, s = 1; k1 and k2 are coefficients, k1 = 0.2, k2 = 0.8. The speed adjustment module calculates the optimal running speed according to this formula and controls the rotational speed of the drive motor of the elevator traction machine to make the elevator approach this speed for operation. And the acceleration a of the speed adjustment module when adjusting the elevator speed needs to satisfy the following formula restriction |a| ≤ Fm / m2, where Fmax is the maximum force that the elevator traction machine can provide, and m2 is the total mass of the elevator and the load. At the same time, to ensure passenger comfort, the change rate of the acceleration satisfies ≤ 0.75m / s 3 . During the process of adjusting the speed, the speed adjustment module calculates and controls the acceleration and the change rate of the acceleration in real time, making the speed adjustment more scientific and reasonable, taking into account the influence of the load and running state on the speed, optimizing the running speed of the elevator on the premise of ensuring safety and comfort, and achieving the purpose of energy conservation.

[0047] In step S5, the energy feedback control module decides whether to start the energy feedback device according to the information sent by the microprocessor it receives. The energy recovery value index E for the energy feedback control module to judge whether it is worth starting the energy feedback device is E = ΔE×η / p, where ΔE is the mechanical energy that can be recovered by the elevator during the current braking or descending stage, and is calculated according to the formula ΔE = 1 / 2m(v3 2 -v4 2 ), m is the total mass of the elevator and the load, v3 is the starting speed of braking or descending, v4 is the ending speed of braking or descending, and Δh is the height change; η

[0048] is the energy conversion efficiency of the energy feedback device, and its value range is 0.9 - 0.98; p is the self-power loss when the energy feedback device is running. When E > 1 and the elevator is in the braking or descending state, and at the same time m / m1 ≥ 0.2

[0049] , start the energy feedback device to convert the mechanical energy generated by the elevator into electrical energy and feed it back to the power grid; when the elevator is in the ascending state or m / m1 < 0.2, turn off the energy feedback device.

[0050] Example G: When the elevator is in the braking or descending state and the load reaches 10% of the rated load, the energy feedback device is started. In the elevator test of a certain hotel, it runs 9000 times a month. Although the energy feedback device starts frequently, due to the limited recoverable mechanical energy at low loads and the increased energy consumption of the device itself, the total energy consumption is about 4310 degrees. Excessive ineffective starts reduce the overall energy-saving efficiency.

[0051] Example H: When the elevator is in the braking or descending state and the load reaches 30% of the rated load, the energy feedback device is started. The same elevator in this hotel runs 9000 times in the same test period, and the energy consumption is about 4100 degrees. Due to the relatively high start threshold, some recoverable energy is not utilized, and the energy-saving effect is limited.

[0052] Embodiment of this patent: When the elevator is in the braking or descending state and the load reaches 20% of the rated load, the energy feedback device is started. Under this setting, the elevator in this hotel runs 9000 times a month, and the energy consumption is reduced to 4020 degrees. It can better balance the timing and amount of energy recovery, effectively improve the energy utilization rate, and reduce the elevator energy consumption. The 20% energy feedback start load threshold set in this patent performs optimally in comprehensively considering the energy recovery efficiency and the energy consumption of the device, and can effectively improve the energy-saving performance of the elevator.

[0053] When the load reaches 30% or more of the rated load, the energy consumed by the elevator during operation is relatively large. Identifying it as a heavier load specifically helps to adopt a more optimized operation strategy for this high-energy consumption state in the control system. The 20% load threshold is mainly considered from the perspective of energy feedback. Because even when the load is relatively light, there is still a certain amount of mechanical energy that can be recovered during the braking or descending process of the elevator. Starting the energy feedback device at this time can effectively utilize this part of the energy and improve the overall energy-saving effect. By starting the energy feedback device with a lower threshold, more energy can be captured, increasing the total amount of energy recovered, thereby enhancing the energy-saving effect.

[0054] As a further preferred embodiment, the energy feedback device includes an inverter, a filter, and a controller. The inverter is used to convert the DC electrical energy generated during the braking and descending process of the elevator into AC electrical energy with the same frequency and phase as the power grid. The filter is used to filter the converted AC electrical energy to remove the harmonic components therein. The controller is used to monitor and control the working state of the energy feedback device to ensure the stability and high efficiency of the energy feedback process, improve the quality of the feedback electrical energy, reduce the interference to the power grid, and ensure the reliable operation of the energy feedback device.

[0055] As a further preferred embodiment, in step S3, after the microprocessor of the elevator control system receives the load information, running speed information, and position information, the above information is stored through the storage module for at least 30 days, facilitating subsequent analysis of the elevator operation data, which can be used for fault troubleshooting, performance optimization, and energy-saving effect evaluation, etc., providing data support for continuously improving the elevator energy-saving control strategy.

[0056] As a further preferred embodiment, in step S5, after the energy feedback device is started, if it is detected that the instantaneous fluctuation of the grid voltage exceeds ±15%, the energy feedback control module automatically suspends the energy feedback and restarts the energy feedback within 5 seconds after the grid voltage returns to normal, protecting the grid and the elevator system, avoiding equipment damage or abnormal energy feedback caused by abnormal fluctuations of the grid voltage, and improving the stability and reliability of the system operation.

[0057] As a further preferred embodiment, in step S4, when the speed adjustment module adjusts the elevator running speed, each time the speed is adjusted, the speed adjustment result is fed back to the microprocessor of the elevator control system. If the speed adjustment error fed back continuously three times exceeds ±0.1 m / s, the microprocessor triggers a fault alarm to timely detect abnormal situations during the speed adjustment process, facilitating maintenance personnel to repair the speed adjustment module, ensuring the accuracy and stability of the elevator running speed, and enhancing the passenger riding experience.

[0058] As a further preferred embodiment, before the elevator starts running for the first time every day, the system automatically self-checks the pressure sensor, speed sensor, and position sensor. The self-check process is to input an analog signal to the sensor and detect whether the output of the sensor is within the preset error range. If any sensor fails the self-check, the elevator is prohibited from running, and an alarm prompt is issued in the elevator car and the monitoring room to ensure that the sensors are in a normal working state before the elevator runs, avoiding abnormal elevator operation caused by sensor failures, and improving the safety and reliability of the elevator operation.

[0059] As a further preferred embodiment, the controller in the energy feedback device includes a remote communication module, and the working state, electric energy conversion data, and other information of the energy feedback device are transmitted to the remote monitoring center in real time through the wireless communication module in the remote communication module, facilitating the management personnel to remotely monitor the operation of the energy feedback device, timely obtaining the data related to the elevator energy-saving effect, realizing the remote management and maintenance of the elevator energy-saving system, and improving the management efficiency.

[0060] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field according to the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. An elevator energy-saving control method, characterized in that, It includes the following steps: S1: The load condition of the elevator is monitored in real time through the pressure sensor at the bottom of the elevator car, and the above load condition information is transmitted to the microprocessor of the elevator control system; S2: The running speed and position information of the elevator are monitored in real time through the speed sensor on the elevator traction machine and the position sensor in the elevator shaft, and the above information is transmitted to the microprocessor of the elevator control system; S3: The microprocessor of the elevator control system sends the load condition information, running speed information and position information to the speed adjustment module and the energy feedback control module respectively; S4: The speed adjustment module controls the speed of the drive motor of the elevator traction machine according to the information sent by the microprocessor to adjust the running speed of the elevator in real time; S5: The energy feedback control module decides whether to start the energy feedback device according to the information sent by the microprocessor. When the elevator is in the braking or descending state and the load reaches a certain threshold, the energy feedback device is started to convert the mechanical energy generated by the elevator into electrical energy and feed it back to the power grid; when the elevator is in the ascending state or the load is light, the energy feedback device is turned off.

2. The elevator energy-saving control method according to claim 1, characterized in that, In step S1, when the pressure sensor measures the load condition, if the load reaches 30% or more of the rated load of the elevator, it is determined as a heavy load, and if it is less than 30%, it is determined as a light load; In step S4, when the elevator speed change rate exceeds 0.3 m / s 2 it is determined as an acceleration or deceleration state, and when the speed is stable within the range of ±5% of the rated speed, it is determined as a uniform running state. For an elevator with a rated speed of 2 m / s, the speed can be increased to 2.2 - 2.4 m / s when descending with a light load, and the speed can be reduced to 1.8 - 1.9 m / s when ascending with a heavy load; In step S5, when the elevator is in the braking or descending state and the load reaches 20% of the rated load, the energy feedback device is started.

3. The elevator energy-saving control method according to claim 1, characterized in that The energy feedback device includes an inverter, a filter and a controller. The inverter is used to convert the DC electrical energy generated during the braking and descending of the elevator into AC electrical energy with the same frequency and phase as the power grid. The filter is used to filter the converted AC electrical energy to remove the harmonic components therein. The controller is used to monitor and control the working state of the energy feedback device.

4. A method for elevator energy-saving control according to claim 1, characterized in that, In step S3, after the microprocessor of the elevator control system receives the load information, running speed information and position information, the above information is stored through the storage module for at least 30 days.

5. A method for elevator energy-saving control according to claim 1, characterized in that, In step S5, when the energy feedback device is started, if it is detected that the instantaneous voltage fluctuation of the power grid exceeds ±15%, the energy feedback control module automatically suspends the energy feedback and restarts the energy feedback within 5 seconds after the power grid voltage returns to normal.

6. The elevator energy-saving control method according to claim 1, characterized in that, In step S4, when the speed adjustment module adjusts the running speed of the elevator, it feeds back the speed adjustment result to the microprocessor of the elevator control system every time the speed is adjusted. If the speed adjustment error continuously feedbacked three times exceeds ±0.1m / s, the microprocessor triggers a fault alarm.

7. A method for elevator energy-saving control according to claim 1, characterized in that Before the elevator starts running for the first time every day, the system automatically self-checks the pressure sensor, speed sensor and position sensor. The self-check process detects whether the output of the sensor is within the preset error range by inputting an analog signal to the sensor. If any sensor fails the self-check, the elevator is prohibited from running, and an alarm prompt is issued in the elevator car and the monitoring room.

8. The elevator energy-saving control method according to claim 3, wherein The controller in the energy feedback device includes a remote communication module, and the working state, electrical energy conversion data and other information of the energy feedback device are transmitted to the remote monitoring center in real time through the wireless communication module in the remote communication module.

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