Classified variable speed control method and system for elevator

Abstract

The invention relates to the technical field of elevator control, and discloses an elevator graded variable speed control method and system.The elevator graded variable speed control method comprises the steps that operation condition data of an elevator are obtained, and the operation condition data at least comprise the car load, the target floor distance and passenger flow state information; according to the operation condition data, operation modes of the elevator are determined, the operation modes comprise a normal operation mode, an efficient operation mode and an energy-saving operation mode, an elevator speed control curve corresponding to the current operation mode is generated based on the operation condition data, and the elevator is controlled to operate according to the speed control curve; when the elevator is in an efficient operation mode and the instantaneous power of the traction motor exceeds the preset safe power threshold value, the speed control curve is adjusted to reduce the operation speed of the elevator; and after the elevator reaches the target floor and stops, the operation condition data are reset, and the problems that in the prior art, the elevator is low in operation efficiency, high in energy consumption and insufficient in safety are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of elevator control technology, in particular to a kind of lift grading speed control method and system. BACKGROUND

[0002] With the acceleration of urbanization, high-rise buildings are increasing, and elevators have become an indispensable vertical transport tool. As of August 2025, the number of elevators in use in China has reached 12 million. To improve transportation efficiency, the traditional way is mainly to increase the rated speed of single elevator or add elevators. However, increasing the rated speed often requires the reconstruction of the shaft, pit and other hardware, which is costly; increasing the number of elevators occupies building space, which is a huge investment, and both are not suitable for the reconstruction of existing buildings.

[0003] Some existing technologies aim to improve the efficiency or safety of elevator operation. For example, Chinese patent application No. 201210219762.1 discloses an elevator speed controller with super-rated speed and its control method, but it does not fully consider the safety protection problem under different loads. Application No. 202310598463.1 discloses an abnormal grading protection system for variable speed elevators, but uses emergency stop when the power is too high, which has a large impact and affects comfort and equipment life. Application No. 202511013078.1 discloses a variable frequency drive system for lift control, which can dynamically adjust the speed, but its protection mechanism mainly focuses on acceleration limitation.

[0004] In summary, the existing technology lacks a control scheme that can dynamically and smoothly adjust the running speed within the safe boundary of the motor power according to multi-dimensional information such as actual load, running distance, passenger flow, etc., and can intelligently switch between efficiency and energy-saving modes. SUMMARY

[0005] To overcome the shortcomings in the above background art, the present application proposes a lift grading speed control method and system, which solves the problems of low efficiency, high energy consumption and insufficient safety of the elevator in the prior art.

[0006] The technical solution of the present application is as follows: a lift grading speed control method, comprising the following steps:

[0007] S1: Obtain the running condition data of the elevator, which includes at least car load, target floor distance and passenger flow state information.

[0008] S2: Determine the running mode of the elevator according to the running condition data, which includes normal running mode, high efficiency running mode and energy saving running mode, wherein:

[0009] The normal operation mode is that when the car load exceeds the first set proportion of the rated load, the elevator is controlled to operate according to a fixed speed control curve, the maximum operating speed of the elevator does not exceed the rated speed, and an overload alarm and a stop operation are triggered;

[0010] The high-efficiency operation mode is that when the car load is less than the first set proportion of the rated load and the target floor distance is greater than a preset floor distance threshold, the traction motor of the elevator is controlled to operate at a speed exceeding the rated speed within a preset safe power threshold range.

[0011] The energy-saving operation mode is that when the passenger flow state information indicates a low passenger flow condition, the elevator is controlled to operate at a low speed lower than the rated speed.

[0012] S3: Based on the operation condition data, a speed control curve corresponding to the current operation mode is generated, and the elevator is controlled to operate according to the speed control curve.

[0013] S4: When the elevator is in the high-efficiency operation mode and the instantaneous power of the traction motor exceeds the preset safe power threshold, the speed control curve is adjusted to reduce the operating speed of the elevator.

[0014] S5: After the elevator reaches the target floor and completes the stop, the operation condition data is reset, and the step S1 is returned.

[0015] Preferably, in step S1, the passenger flow state information is obtained by at least one of the following ways: an infrared human sensor in the car, a passenger flow counter in the elevator door area, a camera installed on the floor, or based on historical passenger flow rule data stored by the system.

[0016] Preferably, the preset floor distance threshold is preset according to the rated speed of the elevator, the floor height, and the acceleration / deceleration performance parameters; and the low passenger flow condition is determined by real-time detection of passenger flow data or according to a preset fixed time period in historical data.

[0017] Preferably, in step S3, the speed control curve corresponding to the high-efficiency operation mode is generated by the following way:

[0018] According to the rated power of the traction motor, the car load, the car self-weight, the counterweight mass, the system friction, and a preset maximum acceleration value, the maximum operating speed of the traction motor allowed to drive the elevator is calculated.

[0019] In combination with the target floor distance and historical operation data of the elevator, a speed control curve with controlled acceleration change rate is generated, which controls the operating speed of the elevator to exceed the rated speed within a preset time period, while ensuring that the target floor distance meets the acceleration / deceleration time requirement required by the speed control curve.

[0020] Preferably, in step S4, the instantaneous power of the traction motor is calculated according to the real-time running stage of the elevator, the running stage including an acceleration stage, a constant speed stage and a deceleration stage, wherein:

[0021] In the acceleration stage, the calculation formula of the instantaneous power of the traction motor is:

[0022] .

[0023] In the constant speed stage, the calculation formula of the instantaneous power of the traction motor is:

[0024] .

[0025] In the deceleration stage, the calculation formula of the instantaneous power of the traction motor is:

[0026] .

[0027] wherein, is the self-weight of the elevator car, is the actual load of the elevator car, is the counterweight, is the acceleration of gravity, is the friction force, is the mass of the elevator car, is the actual load mass of the elevator car, is the instantaneous acceleration of the elevator car, is the instantaneous speed of the elevator car, is the rated power of the traction motor.

[0028] A step-variable control system of a lift for implementing the step-variable control method of the lift as above, comprising:

[0029] a sensor module for collecting running condition data of the elevator, the running condition data at least including car load, target floor distance and passenger flow state information;

[0030] a step decision module for determining a running mode of the elevator according to the running condition data, the running mode including a normal running mode, an efficient running mode and an energy-saving running mode, wherein:

[0031] the normal running mode is that when the car load exceeds a first set proportion of the rated load, the elevator is controlled to run according to a fixed speed curve, the maximum speed does not exceed the rated speed, and an overload alarm and stop are triggered;

[0032] the efficient running mode is that when the car load is lower than the first set proportion of the rated load and the target floor distance is greater than a preset floor distance threshold, the traction motor is controlled to run at a speed greater than a preset safe power threshold;

[0033] The energy-saving operation mode is to control the elevator to run at a low speed when the passenger flow state information indicates a low passenger flow condition;

[0034] The dynamic speed control module is used to generate a corresponding elevator speed control curve according to the determined operation mode, and control the elevator to run according to the curve;

[0035] The power detection module is used to monitor the instantaneous power of the traction motor in real time in the high-efficiency operation mode, and send a speed adjustment signal to the dynamic speed control module when the instantaneous power exceeds a preset safety power threshold;

[0036] The protection adjustment module is used to control the dynamic speed control module to adjust the speed control curve to reduce the elevator running speed according to the adjustment signal;

[0037] The control execution module is used to convert the speed control curve into a frequency converter driving signal to control the traction motor to run;

[0038] The state resetting module is used to reset the operation condition data after the elevator reaches the target floor and stops, and trigger the sensor module to reacquire data to return the system to the initial running state.

[0039] Preferably, in the sensor module, the passenger flow state information is obtained by at least one of the following ways: an infrared human sensor in the car, a passenger flow counter in the elevator door area, a floor camera, or based on historical passenger flow rule data stored by the system.

[0040] Preferably, the preset floor distance threshold is preset according to the rated speed of the elevator, the floor height and the acceleration / deceleration performance parameters; the low passenger flow condition is determined by real-time passenger flow detection or according to historical data in a preset fixed time period.

[0041] Preferably, the speed control curve corresponding to the high-efficiency operation mode generated by the dynamic speed control module is generated by the following way:

[0042] Based on the rated power of the traction motor, the car load, the car self-weight, the counterweight mass, the friction force and the preset maximum acceleration value, the maximum speed allowed by the traction motor to drive the elevator is calculated;

[0043] Combined with the target floor distance and historical operation data, a speed control curve with controlled acceleration change rate is generated, which controls the elevator running speed to exceed the rated speed within a preset time period, while ensuring that the target floor distance meets the acceleration / deceleration time required by the curve.

[0044] Preferably, in the power detection module, the instantaneous power of the traction motor is calculated according to the real-time running stage of the elevator, and the running stage includes an acceleration stage, a constant speed stage and a deceleration stage, wherein:

[0045] In the acceleration phase, the calculation formula of the instantaneous power of the traction motor is:

[0046] .

[0047] In the uniform speed phase, the calculation formula of the instantaneous power of the traction motor is:

[0048] .

[0049] In the deceleration phase, the calculation formula of the instantaneous power of the traction motor is:

[0050] .

[0051] wherein, is the self weight of the elevator car, is the actual load of the elevator car, is the counterweight, is the acceleration of gravity, is the friction, is the mass of the elevator car, is the actual load mass of the elevator car, (t) is the instantaneous acceleration of the elevator car, is the instantaneous speed of the elevator car, is the rated power of the traction motor.

[0052] The present application has the beneficial effects that: the present application automatically switches three operation modes of normal, high efficiency and energy saving by collecting multi-dimensional working condition data such as car load, target floor distance, passenger flow state, solves the problem that the traditional elevator fixed speed operation cannot balance efficiency, energy saving and safety, realizes the optimal control under different working conditions; in the light load long distance working condition, the maximum allowable speed is calculated and a reasonable speed control curve is generated, realizing the overspeed operation within the safety range, effectively shortening the user's riding time, improving the elevator transportation efficiency, especially suitable for the rapid transportation demand of high-rise buildings during peak period; in the low passenger flow working condition, the elevator is controlled to run at low speed, reducing the energy consumption of the traction motor, reducing the building operation cost, meeting the development trend of green energy saving; the maximum speed is limited not to exceed the rated speed in the heavy load working condition, and the alarm and stop operation are triggered when overloaded; in the high efficiency operation mode, the motor power is monitored in real time, and the speed is dynamically reduced when the threshold value is exceeded, avoiding the overload of the motor, and comprehensively guaranteeing the safety and stability of the elevator operation. BRIEF DESCRIPTION OF DRAWINGS

[0053] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a flowchart of the overall process of the elevator graded speed control method of the present invention;

[0055] Figure 2 This is a framework diagram of the operation mode of the elevator graded speed control method of the present invention;

[0056] Figure 3 This is a schematic diagram of the structure of the elevator graded speed control system of the present invention;

[0057] In the diagram: 1. Sensor module; 2. Hierarchical decision-making module; 3. Dynamic speed control module; 4. Power detection module; 5. Protection and regulation module; 6. Control execution module; 7. Status reset module. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0059] like Figure 1 , 2 As shown in Example 1, a step-by-step speed control method for an elevator according to the present invention includes the following steps:

[0060] Step 1: Collect operating condition data

[0061] Acquire elevator operating condition data, which includes at least the car load, target floor distance, and passenger flow status information:

[0062] The weight of the elevator car is collected by a weight sensor inside the elevator car.

[0063] The target floor distance is calculated based on the difference between the current floor and the target floor selected by the user, combined with the preset single floor height.

[0064] Passenger flow information is obtained through at least one of the following methods: infrared human body sensors in the elevator car, passenger flow counters in the elevator door area, cameras installed on each floor, or based on historical passenger flow pattern data stored in the system (such as weekday morning peak hours, evening peak hours, and low passenger flow hours in the early morning).

[0065] Step two: determine the running mode

[0066] According to the running condition data, determine the running mode of the elevator, which includes normal running mode, high-efficiency running mode and energy-saving running mode, and the specific determination logic is as follows:

[0067] Normal running mode: when the car load exceeds the first set proportion (50% in this embodiment) of the rated load, this mode is triggered. At this time, the elevator is controlled to run according to the fixed speed control curve, and the maximum running speed of the elevator does not exceed the rated speed. If the car load continues to exceed the rated load, the overload alarm and stop operation are triggered to ensure the safety of operation.

[0068] High-efficiency running mode: when the car load is less than the first set proportion (50%) of the rated load, and the target floor distance is greater than the preset floor distance threshold, this mode is triggered. The preset floor distance threshold is pre-set according to the rated speed of the elevator, the floor height and the acceleration and deceleration performance parameters (for example, for an elevator with a rated speed of 2.5 m / s and a floor height of 3 m, the floor distance threshold can be set to 10 floors corresponding to 30 m), to ensure that the elevator has enough distance to complete the acceleration, constant speed and deceleration process. In this mode, the traction motor of the elevator is controlled to run at a speed higher than the rated speed within the preset safe power threshold, to improve the transportation efficiency.

[0069] Energy-saving running mode: when the passenger flow state information indicates a low passenger flow condition, this mode is triggered. The low passenger flow condition is determined by real-time detection of passenger flow data (such as the number of people getting on and off the elevator per unit time being lower than the preset threshold) or according to historical data in a preset fixed period (such as 2:00-6:00 in the morning). In this mode, the elevator is controlled to run at a low speed lower than the rated speed to reduce energy consumption.

[0070] Step three: generate the speed control curve and execute the running

[0071] Based on the running condition data, generate the elevator speed control curve corresponding to the current running mode, and control the elevator to run according to the speed control curve:

[0072] For normal running mode and energy-saving running mode, the speed control curve is a preset fixed curve, and the normal mode curve is based on the rated speed, and the energy-saving mode curve is based on a fixed low speed lower than the rated speed.

[0073] For high-efficiency running mode, the speed control curve is generated by the following method:

[0074] ① According to the rated power of the traction motor, the car load, the car self weight, the counterweight mass, the system friction and the preset maximum acceleration value, the maximum running speed allowed by the traction motor to drive the elevator is calculated to ensure that the speed is within the safe power range of the motor;

[0075] ② In combination with the target floor distance and the historical running data of the elevator, in combination with the allowed range of the actual elevator mechanical speed limit (to avoid conflict with the existing specification), a speed control curve with controlled acceleration change rate is generated, which controls the running speed of the elevator to exceed the rated speed within a preset time period, while ensuring that the target floor distance meets the acceleration and deceleration time requirements required by the speed control curve, avoiding the impact on the stopping accuracy due to the short distance of the floor.

[0076] Step four: power monitoring and speed adjustment in high efficiency operation mode

[0077] When the elevator is in high efficiency operation mode, the instantaneous power of the traction motor is monitored in real time, and it is judged whether the instantaneous power exceeds the preset safe power threshold:

[0078] The instantaneous power of the traction motor is calculated according to the real-time running stage of the elevator (acceleration stage, constant speed stage and deceleration stage), and the calculation formula of each stage is as follows:

[0079] In the acceleration stage, the calculation formula of the instantaneous power of the traction motor is:

[0080] ;

[0081] In the constant speed stage, the calculation formula of the instantaneous power of the traction motor is:

[0082] ;

[0083] In the deceleration stage, the calculation formula of the instantaneous power of the traction motor is:

[0084] ;

[0085] Wherein, is the self weight of the elevator car, is the actual load of the elevator car, is the counterweight, is the acceleration of gravity, is the friction, is the mass of the elevator car, is the actual load mass of the elevator car, (t) is the instantaneous acceleration of the elevator car, is the instantaneous speed of the elevator car, is the rated power of the traction motor.

[0086] Step five: state reset and loop running

[0087] After the elevator reaches the target floor and completes the stop, the running condition data (including the car load, target floor distance, passenger flow state information, etc.) is reset by the state reset module 7, and returns to step S1 to re-collect the running condition data of the next round, and enters the next cycle control process.

[0088] Reference Figure 3 , embodiment 2, a stepless variable speed control system for elevators, comprising the following functional modules:

[0089] Sensor module 1, for collecting the running condition data of the elevator, the running condition data at least including the car load, target floor distance and passenger flow state information:

[0090] Configure the weight sensor to collect the car load;

[0091] Configure the floor positioning sensor and distance calculation unit to calculate the target floor distance in combination with the floor height parameter;

[0092] Configure at least one of the in-car infrared human body sensor, elevator door area passenger flow counter, and floor camera, or call the historical passenger flow rule data stored by the system, to obtain the passenger flow state information.

[0093] Hierarchical decision module 2, in communication connection with the sensor module 1, for receiving the running condition data collected by the sensor module 1, and determining the running mode of the elevator (normal running mode, high-efficiency running mode, energy-saving running mode) according to the condition data, the mode determination logic being consistent with step S2 in the above control method.

[0094] Dynamic speed control module 3, in communication connection with the hierarchical decision module 2, for generating a corresponding elevator speed control curve according to the running mode determined by the hierarchical decision module 2:

[0095] For normal running mode and energy-saving running mode, call the preset fixed speed control curve;

[0096] For high-efficiency running mode, generate an overspeed speed control curve with controlled acceleration change rate in the manner of step S3 in the above control method.

[0097] Power detection module 4, in communication connection with the dynamic speed control module 3 and the traction motor, for monitoring the instantaneous power of the traction motor in real time in high-efficiency running mode:

[0098] According to the real-time running phase (acceleration, constant speed, deceleration) of the elevator, the instantaneous power is calculated by using the corresponding power calculation formula;

[0099] When the instantaneous power exceeds the preset safety power threshold, a speed regulation adjustment signal is sent to the protection adjustment module 5.

[0100] The protection adjustment module 5 is in communication connection with the power detection module 4 and the dynamic speed regulation control module 3 respectively, for receiving the speed regulation adjustment signal sent by the power detection module 4, and controlling the dynamic speed regulation control module 3 to adjust the speed control curve, so as to reduce the running speed of the elevator and ensure that the motor power is within the safety range.

[0101] The control execution module 6 is in communication connection with the dynamic speed regulation control module 3, for converting the speed control curve generated by the dynamic speed regulation control module 3 into a frequency converter driving signal, driving the traction motor to run according to the speed control curve, so as to realize the lifting and speed regulation of the elevator.

[0102] The state resetting module 7 is in communication connection with the sensor module 1 and the hierarchical decision module 2, for resetting the running working condition data after the elevator reaches the target floor and completes the stop, and triggering the sensor module 1 to re-collect data, so as to return the system to the initial running state and enter the next round of control cycle.

[0103] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A step-variable control method for an elevator, characterized by, The method comprises the following steps: S1: obtaining the running condition data of the elevator, the running condition data comprising at least the car load, the target floor distance, and the passenger flow state information; S2: determining the running mode of the elevator according to the running condition data, the running mode comprising a normal running mode, an efficient running mode, and an energy-saving running mode, wherein: the normal running mode is that when the car load exceeds the first set proportion of the rated load, the elevator is controlled to run according to a fixed speed control curve, the maximum running speed of the elevator does not exceed the rated speed, an overload alarm is triggered, and the elevator is stopped; the efficient running mode is that when the car load is lower than the first set proportion of the rated load and the target floor distance is greater than the preset floor distance threshold, the traction motor of the elevator is controlled to run at a speed exceeding the rated speed within the preset safe power threshold range; the energy-saving running mode is that when the passenger flow state information indicates a low passenger flow condition, the elevator is controlled to run at a low speed lower than the rated speed; S3: generating the speed control curve corresponding to the current running mode based on the running condition data, and controlling the elevator to run according to the speed control curve; S4: when the elevator is in the efficient running mode and the instantaneous power of the traction motor exceeds the preset safe power threshold, adjusting the speed control curve to reduce the running speed of the elevator; S5: after the elevator reaches the target floor and completes the stop, resetting the running condition data and returning to step S1.

2. The stepwise variable control method of the lift elevator according to claim 1, characterized by, In step S1, the passenger flow state information is obtained by at least one of the following methods: an infrared human body sensor in the car, a passenger flow counter in the elevator door area, a camera installed on the floor, or based on historical passenger flow rule data stored by the system.

3. The stepwise variable control method of the lift elevator according to claim 2, characterized by, The preset floor distance threshold is preset according to the rated speed of the elevator, the floor height, and the acceleration / deceleration performance parameters; and the low passenger flow condition is determined by real-time detection of passenger flow data or according to historical data in a preset fixed time period.

4. The stepwise variable control method of the lift elevator according to claim 3, characterized by, In step S3, the speed control curve corresponding to the efficient running mode is generated by the following method: the maximum running speed of the elevator allowed to be driven by the traction motor is calculated according to the rated power of the traction motor, the car load, the car self-weight, the counterweight mass, the system friction, and the preset maximum acceleration value; a speed control curve with controlled acceleration change rate is generated by combining the target floor distance with the historical running data of the elevator, which controls the running speed of the elevator to exceed the rated speed within a preset time period, while ensuring that the target floor distance meets the acceleration / deceleration time requirement required by the speed control curve.

5. The stepwise control method of the lift elevator according to claim 1, wherein In step S4, the instantaneous power of the traction motor is calculated according to the real-time running stage of the elevator, and the running stage comprises an acceleration stage, a constant speed stage, and a deceleration stage, wherein: in the acceleration stage, the calculation formula of the instantaneous power of the traction motor is: ； in the constant speed stage, the calculation formula of the instantaneous power of the traction motor is: ； in the deceleration stage, the calculation formula of the instantaneous power of the traction motor is: ； wherein is the elevator car self weight, is the elevator car actual load, is the counterweight, is the gravitational acceleration, is the friction force, is the elevator car mass, is the elevator car actual load mass, is the elevator car instantaneous acceleration, is the elevator car instantaneous speed, is the traction machine rated power.

6. A step-variable control system for an elevator hoist, characterized by The method is used to realize the step-variable speed control method of the elevator as claimed in any one of claims 1 to 5, comprising: The sensor module (1) is used to collect the operating condition data of the elevator, and the operating condition data at least includes the car load, the target floor distance and the passenger flow state information; The hierarchical decision module (2) is used to determine the operating mode of the elevator according to the operating condition data, and the operating mode includes the normal operating mode, the efficient operating mode and the energy-saving operating mode, wherein: The normal operating mode is that when the car load exceeds the first set proportion of the rated load, the elevator is controlled to run according to the fixed speed curve, and the maximum speed does not exceed the rated speed, and the overload alarm and the stop of the elevator are triggered; The efficient operating mode is that when the car load is less than the first set proportion of the rated load and the target floor distance is greater than the preset floor distance threshold, the traction motor is controlled to run at the speed exceeding the preset safety power threshold; The energy-saving operating mode is that when the passenger flow state information indicates the low passenger flow condition, the elevator is controlled to run at the low speed; The dynamic speed control module (3) is used to generate the corresponding elevator speed control curve according to the determined operating mode, and control the elevator to run according to the curve; The power detection module (4) is used to monitor the instantaneous power of the traction motor in real time in the efficient operating mode, and send the speed adjustment signal to the dynamic speed control module (3) when the instantaneous power exceeds the preset safety power threshold; The protection adjustment module (5) is used to control the dynamic speed control module (3) to adjust the speed control curve to reduce the running speed of the elevator according to the adjustment signal; The control execution module (6) is used to convert the speed control curve into the frequency converter driving signal to control the running of the traction motor; The state resetting module (7) is used to reset the operating condition data after the elevator reaches the target floor and stops, and trigger the sensor module (1) to collect data again, so that the system returns to the initial operating state.

7. The step-variable control system for a lift elevator according to claim 6, wherein In the sensor module (1), the passenger flow state information is obtained by at least one of the following ways: the infrared human sensor in the car, the passenger flow counter in the elevator door area, the floor camera, or based on the historical passenger flow rule data stored by the system.

8. The step-variable control system for a lift elevator according to claim 7, wherein The preset floor distance threshold is preset according to the rated speed of the elevator, the floor height and the acceleration / deceleration performance parameters; the low passenger flow condition is determined by real-time passenger flow detection or according to the historical data in the preset fixed time period.

9. The step-variable control system for a lift elevator according to claim 8, wherein The speed control curve corresponding to the efficient operating mode generated by the dynamic speed control module (3) is generated by the following way: Based on the rated power of the traction motor, the car load, the car self weight, the counterweight mass, the friction and the preset maximum acceleration value, the maximum speed allowed by the traction motor to drive the elevator is calculated; Combined with the target floor distance and the historical operating data, a speed control curve with controlled acceleration change rate is generated, which controls the running speed of the elevator to exceed the rated speed within the preset time period, while ensuring that the target floor distance meets the acceleration / deceleration time required by the curve.

10. The step-variable control system for a lift elevator according to claim 9, wherein In the power detection module (4), the instantaneous power of the traction motor is calculated according to the real-time running stage of the elevator, and the running stage includes the acceleration stage, the constant speed stage and the deceleration stage, wherein: In the acceleration stage, the calculation formula of the instantaneous power of the traction motor is: ； In the uniform speed stage, the calculation formula of the instantaneous power of the traction motor is: ； In the deceleration stage, the calculation formula of the instantaneous power of the traction motor is: ； wherein M is the elevator car self weight, M is the elevator car actual load, M is the counterweight, g is the gravitational acceleration, F is the friction force, m is the elevator car mass, m is the elevator car actual load mass, (a) is the elevator car instantaneous acceleration, (v) is the elevator car instantaneous speed, P is the traction machine rated power.

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