Elevator control system

Abstract

The invention discloses an elevator control system, an elevator is provided with an energy storage device, the energy storage device stores regenerated energy generated by an elevator driving motor in a regeneration state and provides the regenerated energy to the elevator driving motor in an electric state, and the elevator control system comprises a prediction module used for predicting a passenger flow mode of the elevator; the obtaining module is used for obtaining information of the movable body, the information of the movable body at least comprises the floor where the movable body is located and the mass of the movable body, and the movable body is a device capable of receiving a control instruction of an elevator control system to enter or leave an elevator car; the judging module is used for judging whether the passenger flow mode can enable an elevator driving motor to be in a regeneration state or not; and the control module is used for generating a first control instruction when the judgment result of the judgment module is yes. According to the elevator control system, the cost and the size of the storage device can be reduced as much as possible while the electric energy consumption of the elevator is reduced as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator control, and in particular to an elevator control system capable of reducing the capacity requirement of an elevator for an energy storage device by controlling a movable body to take the elevator. Background Art

[0002] For traction elevators, their drive motors will be in a regenerative state when going up with a light load or going down with a heavy load, thereby generating regenerative energy. The current methods for processing this energy mainly include: 1) using energy-consuming resistors set on the DC bus to convert it into heat energy for consumption, which has the disadvantage of wasting energy; 2) inverting the regenerative energy into AC power and feeding it back to the power grid, but due to concerns about the quality of the fed-back power and other issues, this processing method is subject to certain restrictions; 3) setting up an energy storage device to store the regenerative energy generated by the drive motor in the regenerative state, and providing the stored regenerative energy to the drive motor when the drive motor is in the electric state. This method overcomes the disadvantage of method 2) that the power grid may be "polluted" due to the poor quality of the fed-back power, and at the same time reduces the power consumption of the elevator because the regenerative energy is reused.

[0003] Most of the existing technologies are aimed at how to control the DC-DC converter located between the DC bus and the energy storage device, such as: CN201110288745.9, CN201010270130.9. In the scheme of using method 3) to process the regenerative energy, the capacity of the energy storage device plays a decisive role in the utilization rate of the regenerative energy. Generally speaking, the larger the capacity of the energy storage device, the more regenerative energy it can store, which is very beneficial for dealing with the afternoon rush hour in office buildings, because at this time the elevator will be in a continuous cycle of heavy load down and no load up for a long time, so it will be in a regenerative state for a long time, and the drive motor will continuously generate regenerative energy. For such a scenario, on the one hand, in order to make full use of the regenerative energy and reduce the power consumption of the elevator, it is necessary to increase the storage capacity of the energy storage device as much as possible. On the other hand, in order to reduce the cost and volume of the storage device, it is necessary to reduce the storage capacity of the energy storage device as much as possible.

[0004] Therefore, how to reduce the cost and volume of the storage device as much as possible while reducing the power consumption of the elevator has become a technical problem to be solved. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to reduce the cost and volume of the storage device as much as possible while reducing the power consumption of the elevator as much as possible.

[0006] In order to solve the above technical problems, the present invention discloses an elevator control system, wherein the elevator is equipped with an energy storage device, the energy storage device stores the regenerative energy generated by the elevator drive motor in the regenerative state and provides it to the elevator drive motor in the electric state, and the elevator control system comprises:

[0007] Prediction module, used to predict the passenger flow pattern of the elevator;

[0008] An acquisition module, used to acquire movable body information, wherein the movable body information at least includes the floor where the movable body is located and its mass, wherein the movable body refers to a device that can accept control instructions of the elevator control system to enter or leave the elevator car;

[0009] A judgment module, used to judge whether the passenger flow pattern will cause the elevator drive motor to be in a regeneration state;

[0010] The control module generates a first control instruction when the judgment result of the judgment module is yes; the first control instruction means that the elevator drive motor changes from the regenerative power in the second state to the electric power in the first state, or the regenerative power of the elevator drive motor in the first state is less than the regenerative power of the elevator drive motor in the second state; the first state refers to the state of the elevator drive motor after the movable body enters or leaves the elevator car under the control of the first control instruction, and the second state refers to the state of the elevator drive motor when the movable body does not enter or leave the elevator car under the control of the first control instruction.

[0011] Preferably, the judgment module judges whether the elevator drive motor is in a regeneration state according to the magnitude relationship between the load in the elevator car and the elevator balanced load and the moving direction of the elevator car in the passenger flow mode.

[0012] Preferably, the judgment module is further based on whether the elevator car has resources to carry a movable body under the passenger flow mode.

[0013] Preferably, when the passenger flow pattern is a downward peak relative to the public layer, the judgment result is yes.

[0014] Preferably, when the judgment result is yes, the control module generates a first control instruction so that the movable body located on the common floor or on the floor between the common floor and the descending passengers takes the elevator to the upper floor when the elevator goes up.

[0015] Preferably, the upper floor is a departure floor for descending passengers.

[0016] Preferably, when the passenger flow pattern is an upward peak relative to the common floor, the control module generates a second control instruction, and the second control instruction enables the movable body located above the common floor to take the descending elevator to the common floor.

[0017] Preferably, the second control instruction preferentially controls the movable body whose floor is the destination floor of the last descending passenger among the ascending passengers to take the descending elevator to the common floor.

[0018] Preferably, the elevator control system also includes: a determination module for determining the remaining storage capacity of the energy storage device; an estimation module for estimating the regenerative energy generated by the elevator drive motor under the passenger flow mode according to the passenger flow pattern; and the judgment module will judge whether the passenger flow pattern will cause the elevator drive motor to be in a regenerative state only when the regenerative energy estimated by the estimation module is greater than the remaining storage capacity.

[0019] Preferably, the minimum range for the prediction module to implement prediction is: in the absence of a movable body, the prediction starting point is the current moment, and the prediction end point is the moment when the regenerative energy accumulated by the elevator drive motor from the current moment first reaches the rated storage capacity of the energy storage device.

[0020] Beneficial technical effects:

[0021] The elevator control system of the present invention can reduce the cost and volume of the storage device as much as possible while reducing the power consumption of the elevator as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of an elevator control system according to Example 1. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] In this embodiment, the elevator is equipped with an energy storage device, which stores the regenerative energy generated by the elevator drive motor in the regenerative state and provides it to the elevator drive motor in the electric state. The elevator control system includes:

[0026] Prediction module, used to predict the passenger flow pattern of the elevator;

[0027] An acquisition module, used to acquire movable body information, wherein the movable body information at least includes the floor where the movable body is located and its mass, wherein the movable body refers to a device that can accept control instructions of the elevator control system to enter or leave the elevator car;

[0028] A judgment module, used to judge whether the passenger flow pattern will cause the elevator drive motor to be in a regeneration state;

[0029] The control module generates a first control instruction when the judgment result of the judgment module is yes; the first control instruction means that the elevator drive motor changes from the regenerative power in the second state to the electric power in the first state, or the regenerative power of the elevator drive motor in the first state is less than the regenerative power of the elevator drive motor in the second state; the first state refers to the state of the elevator drive motor after the movable body enters or leaves the elevator car under the control of the first control instruction, and the second state refers to the state of the elevator drive motor when the movable body does not enter or leave the elevator car under the control of the first control instruction.

[0030] The present application essentially utilizes the mass of the movable body itself to adjust the load in the elevator car, thereby reducing the regenerative power of the elevator drive motor in the regenerative state, or even changing the elevator drive motor from the regenerative state to the electric state, that is, converting the regenerative energy into the potential energy of the movable body.

[0031] The movable body here is any device with a certain mass that can enter or leave the elevator car under the control of the control system, such as a robot.

[0032] Example 2

[0033] This embodiment is further described in detail based on the embodiment 1.

[0034] The judging module judges whether the elevator driving motor is in a regeneration state according to the magnitude relationship between the load in the elevator car and the elevator balanced load and the moving direction of the elevator car under the passenger flow mode.

[0035] In order to adjust the load in the elevator car by controlling the movable body to enter the elevator car, the car should also have resources for carrying the movable body (such as: the car floor in the car that can be occupied by the movable body). Therefore, the judgment module further determines whether the elevator car has resources for carrying the movable body in the passenger flow mode. Only when the elevator drive motor is in the regeneration state and the elevator car has resources for carrying the movable body, the judgment module will output a judgment result of "yes".

[0036] Considering that the load in the elevator car is subsequently adjusted by controlling the movable body to enter the elevator car, the elevator operating state that is suitable for this adjustment and will put the drive motor in a regenerative state should be light load upward movement, while heavy load downward movement is not applicable.

[0037] Therefore, when the passenger flow pattern obtained by the prediction module is a downward peak relative to the common floor (i.e., when going up with a light load), the judgment result of the judgment module is yes, and the control module will generate a first control instruction, so that the movable body located on the common floor or on the floor between the common floor and the descending passengers takes the elevator to the upper floor when the elevator goes up. Preferably, the upper floor is the departure floor of the descending passengers.

[0038] When the passenger flow pattern is an upward peak relative to the common floor, the control module generates a second control instruction, which enables the movable body located above the common floor to take the downward elevator to the common floor; preferably, the second control instruction gives priority to controlling the movable body whose floor is the destination floor of the last passenger getting off the elevator among the ascending passengers to take the downward elevator to the common floor.

[0039] The elevator control system of this embodiment is described below by taking a certain office building as an example.

[0040] For office buildings, during the rush hour after get off work, there is usually a large downward flow of passengers from top to bottom, that is, passengers take the elevator from the upper floors to the first floor and then leave. Usually, there will be many passengers in the elevator car starting from the upper floors, so the load in the car will exceed the balanced load. At this time, the elevator is heavily loaded and goes down, and is in a regeneration state; after the elevator reaches the public floor 1, the passengers who are leaving get off work leave the elevator car. At this time, in order to respond to the downward elevator call signal from the passengers who are leaving work on the higher floors, the elevator will go up to the departure floor of the elevator call signal in an empty state, and there are no passengers in the car when going up (because there will be no upward passengers during the rush hour after get off work), so the elevator is in a regeneration state when (empty) going up. This cycle repeats until the rush hour after get off work ends. It is not difficult to find that during the entire rush hour after work, whether the elevator is heavily loaded down or unloaded up, it is in a regeneration state and will generate regenerative energy, that is, the elevator is continuously generating regenerative energy during the entire rush hour after get off work. If all of this regenerative energy is to be stored, the storage capacity of the energy storage device to be configured will be very large, which will result in very high cost expenditure on the energy storage device. For this reason, the technical solution of this embodiment is applied: after predicting the peak time of getting off work, after the elevator transports the passengers on the upper floors to the first floor and the passengers leave, the movable body on the first floor is controlled to enter the elevator car, and then go up and stop at the departure floor of the downward elevator call signal farthest from the first floor (or the downward elevator call signal assigned by the group management system). Obviously, when the movable body enters the elevator car on the first floor, due to the deadweight of the movable body, the regeneration function of the elevator when going up will be reduced (the deadweight of the movable body is less than the balanced load) or the elevator will be changed from the original regenerative state to the electric state (the deadweight of the movable body exceeds the balanced load). Therefore, the movable body enters the elevator car on the first floor, reducing the regenerative energy accumulated during a round trip consisting of the first trip from the high floor to the first floor and the second trip from the first floor to the departure floor to respond to the elevator call signal, thereby reducing all the regenerative energy accumulated during the entire rush hour, thereby reducing the demand for the storage capacity of the energy storage device without wasting regenerative energy. From the perspective of energy conversion, part of the regenerative energy is converted into the potential energy of the movable body (the movable body is lifted from the first floor to the high floor) and stored.

[0041] Preferably, in order to achieve better technical effects, the following controls may also be performed:

[0042] During the next morning's peak upward period, the elevator will continue to be in a long-term electric state consisting of heavy-load upward movement and empty-load downward movement. During this process, the movable body can be controlled to enter the elevator car and leave the elevator car on the first floor. In this way, the weight of the movable body can reduce the electric power of the elevator during the downward movement (the weight of the movable body is less than the balanced load), or even make the elevator enter a regeneration state when descending (the weight of the movable body exceeds the balanced load). Such a control strategy can, on the one hand, reduce the electric energy consumed by the elevator from the power grid during the entire rush hour, and on the other hand, it can also transport the movable body from the upper floors to the first floor, thereby preparing for the movable body on the first floor required for the continuous regeneration state during the upcoming rush hour. The above-mentioned control of the movable body during the rush hour is essentially to convert the potential energy of the movable body into electric energy and provide it to the drive motor or energy storage device.

[0043] Example 3

[0044] In this embodiment, the elevator control system includes the following modules in addition to the modules in Embodiment 1:

[0045] A determination module, used to determine the remaining storage capacity of the energy storage device;

[0046] An estimation module, configured to estimate the regenerative energy generated by the elevator drive motor under the passenger flow pattern according to the passenger flow pattern;

[0047] The judging module determines whether the passenger flow pattern causes the elevator driving motor to be in a regenerative state only when the regenerative energy estimated by the estimating module is greater than the remaining storage capacity.

[0048] Example 4

[0049] This embodiment further illustrates the prediction module based on the above embodiments.

[0050] The minimum range for the prediction module to implement prediction is: in the absence of a movable body, the prediction starting point is the current moment, and the prediction end point is the moment when the regenerative energy accumulated by the elevator drive motor from the current moment first reaches the rated storage capacity of the energy storage device.

[0051] The essence of the minimum range is that the regenerative energy accumulated within the range will exceed the rated storage capacity of the energy storage device, so it is necessary to subsequently reduce the regenerative energy generated by the drive motor within the predicted range by controlling the movable body.

[0052] The present invention has been described in detail above through specific implementation modes and embodiments, but these do not constitute limitations of the present invention. Without departing from the principles of the present invention, those skilled in the art may also make many variations and improvements, which should also be regarded as the protection scope of the present invention.

Claims

1. An elevator control system, wherein the elevator is provided with an energy storage device, wherein the energy storage device stores regenerative energy generated by an elevator drive motor in a regenerative state and supplies the energy to the elevator drive motor in an electric state, It is characterized in that The elevator control system comprises: Prediction module, used to predict the passenger flow pattern of the elevator; An acquisition module, used to acquire movable body information, wherein the movable body information at least includes the floor where the movable body is located and its mass, wherein the movable body refers to a device that can accept control instructions of the elevator control system to enter or leave the elevator car; A judgment module, used to judge whether the passenger flow pattern will cause the elevator drive motor to be in a regeneration state; The control module generates a first control instruction when the judgment result of the judgment module is yes; the first control instruction means that the elevator drive motor changes from the regenerative power in the second state to the electric power in the first state, or the regenerative power of the elevator drive motor in the first state is less than the regenerative power of the elevator drive motor in the second state; the first state refers to the state of the elevator drive motor after the movable body enters or leaves the elevator car under the control of the first control instruction, and the second state refers to the state of the elevator drive motor when the movable body does not enter or leave the elevator car under the control of the first control instruction.

2. The elevator control system according to claim 1, It is characterized in that The judging module judges whether the elevator driving motor is in a regeneration state according to the magnitude relationship between the load in the elevator car and the elevator balanced load and the moving direction of the elevator car under the passenger flow mode.

3. The elevator control system according to claim 2, It is characterized in that The judgment module is further based on whether the elevator car has resources to carry movable objects under the passenger flow mode.

4. The elevator control system according to claim 2, It is characterized in that When the passenger flow pattern is a downward peak relative to the public floor, the judgment result is yes.

5. The elevator control system according to claim 4, It is characterized in that When the judgment result is yes, the control module generates a first control instruction so that the movable body located on the common floor or on the floor between the common floor and the descending passengers takes the elevator to the upper floor when the elevator goes up.

6. The elevator control system according to claim 5, It is characterized in that The upper floor is the departure floor for descending passengers.

7. The elevator control system according to claim 2, It is characterized in that When the passenger flow pattern is an upward peak relative to the common floor, the control module generates a second control instruction, and the second control instruction enables the movable body located above the common floor to take the descending elevator to the common floor.

8. The elevator control system according to claim 7, It is characterized in that The second control instruction preferentially controls the movable body whose floor is the destination floor of the last descending passenger among the ascending passengers to take the descending elevator to the public floor.

9. The elevator control system according to claim 1, It is characterized in that The elevator control system further comprises: A determination module, used to determine the remaining storage capacity of the energy storage device; An estimation module, configured to estimate the regenerative energy generated by the elevator drive motor under the passenger flow pattern according to the passenger flow pattern; The judging module determines whether the passenger flow pattern causes the elevator driving motor to be in a regenerative state only when the regenerative energy estimated by the estimating module is greater than the remaining storage capacity.

10. The elevator control system according to claim 1, It is characterized in that The minimum range for the prediction module to implement prediction is: when there is no movable body on board, the prediction starting point is the current moment, and the prediction end point is the moment when the regenerative energy accumulated by the elevator drive motor from the current moment first reaches the rated storage capacity of the energy storage device.

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