A method and apparatus for controlling a damper of a range hood

Abstract

A method and device for controlling a damper of a range hood. The method comprises the following steps: obtaining a fan gear, determining a target interval to which the damper should reach according to a preset mapping relationship; when the target interval is behind a current interval in which the damper is currently located, calculating an opening stroke time of the damper from the current interval to the target interval according to an opening time of the damper for each interval, adding a preset damper starting time to the opening stroke time to obtain a running time of the damper; when the target interval is in front of the current interval in which the damper is currently located, calculating a closing stroke time of the damper from the current interval to the target interval according to a closing time of the damper for each interval, adding the preset damper starting time to the closing stroke time to obtain the running time of the damper; and controlling the damper to move according to the running time. The damper opening position can be more accurately controlled.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a method and device for controlling the damper of a range hood. Background Technology

[0002] Currently, the control methods for the air inlet dampers of range hoods on the market generally rely on positioning switches or detecting the motor stall current to determine whether the damper has reached its maximum position or is fully closed. To achieve more precise control of the damper's opening state, existing technologies have also designed control methods that follow the fan speed to control the damper's opening position. These methods rely on multiple limit devices or use average speed timing. Using multiple limit devices increases the manufacturing cost of the range hood; using average speed timing to determine the damper's opening position requires a structure where the damper opens at a uniform speed for accurate timing. However, the damper drive structure of most existing range hoods operates at non-uniform speeds, and the opening and closing speeds of the damper are even more different. Therefore, determining the damper's opening position based on the average speed of the total stroke is inaccurate, especially when the initial position of the damper is different. If the average speed timing is used to calculate whether the damper has reached the intermediate position or other positions without limit switches, significant deviations will occur. Summary of the Invention

[0003] This invention provides a method and device for controlling the damper of a range hood, which can more accurately control the opening position of the damper.

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] According to a first aspect of the present invention, embodiments of the present invention provide a method for controlling the damper of a range hood, comprising the following steps:

[0006] The fan speed is obtained, and the target range that the damper corresponding to the fan speed should reach is determined according to the preset mapping relationship. The total travel of the damper consists of n consecutive ranges arranged in sequence along the opening direction of the damper. The opening time and closing time of the damper to complete each range are measured in advance, and n is a positive integer greater than 2.

[0007] When the target interval is after the current interval where the damper is currently located, the opening travel time of the damper from the current interval to the target interval is calculated based on the opening time of the damper to complete each interval. The opening travel time is added to the preset damper start time when the damper opens to obtain the damper running time.

[0008] When the target interval is before the current interval where the damper is currently located, the closing travel time of the damper from the current interval to the target interval is calculated based on the closing time of the damper after it has completed each interval. The closing travel time is then added to the preset damper start time when the damper closes to obtain the damper's running time.

[0009] The control damper moves according to the stated operating time.

[0010] Preferably, the step of calculating the opening travel time of the damper moving from the current interval to the target interval specifically includes: summing the opening time of the damper in each interval between the current interval and the target interval, half of the opening time of the damper in the current interval, and half of the opening time of the damper in the target interval to obtain the opening travel time; the step of calculating the closing travel time of the damper moving from the current interval to the target interval specifically includes: summing the closing time of the damper in each interval between the current interval and the target interval, half of the closing time of the damper in the current interval, and half of the closing time of the damper in the target interval to obtain the closing travel time.

[0011] Preferably, before the step of obtaining the fan speed and determining the target range that the damper corresponding to the fan speed should reach based on a preset mapping relationship, the following steps are further included:

[0012] On the prototype, obtain the opening time tkn of each section of the prototype, the closing time tgn of each section of the prototype, and the maximum opening stroke time TK and the maximum closing stroke time TG of the upper damper of the prototype;

[0013] After the unit is powered on, obtain the actual maximum opening stroke time Tak and the actual maximum closing stroke time Tag of the unit's damper.

[0014] When Tak and TK are not equal, if Tak is greater than TK, the opening time of the damper to complete each interval is TKn = tkn + (Tak - TK) / n; if Tak is less than TK, the opening time of the damper to complete each interval is TKn = tkn - (TK - Tak) / n. When Tag and TG are not equal, if Tag is greater than TG, the closing time of the damper to complete each interval is TGn = tgn + (Tag - TG) / n; if Tag is less than TG, the closing time of the damper to complete each interval is TGn = tgn - (TG - Tag) / n.

[0015] According to a second aspect of the present invention, embodiments of the present invention provide a damper control device for a range hood, comprising:

[0016] The target interval determination module is used to obtain the fan speed and determine the target interval that the damper corresponding to the fan speed should reach according to the preset mapping relationship; wherein, the total damper stroke consists of n consecutive intervals arranged in sequence along the damper opening direction, and the opening time and closing time of the damper to complete each interval are measured in advance, and n is a positive integer greater than 2;

[0017] The damper opening time module is used to calculate the opening travel time of the damper from the current interval to the target interval when the target interval is after the current interval where the damper is currently located, based on the opening time of the damper to complete each interval. The opening travel time is added to the preset damper start time when the damper opens to obtain the damper running time.

[0018] The damper closing time module is used to calculate the closing travel time of the damper from the current interval to the target interval when the target interval is before the current interval in which the damper is currently located, based on the closing time of the damper after completing each interval. The closing travel time is added to the preset damper start time when the damper closes to obtain the damper running time.

[0019] The damper control operation module is used to control the damper to move according to the operation time.

[0020] Preferably, the damper opening time module is used to accumulate the opening time of the damper when it completes each interval between the current interval and the target interval, half of the opening time of the damper when it completes the current interval, and half of the opening time of the damper when it completes the target interval to obtain the opening travel time; the damper closing time module is used to accumulate the closing time of the damper when it completes each interval between the current interval and the target interval, half of the closing time of the damper when it completes the current interval, and half of the closing time of the damper when it completes the target interval to obtain the closing travel time.

[0021] Preferably, it also includes a time calculation module, which is used for:

[0022] On the prototype, obtain the opening time tkn of each section of the prototype, the closing time tgn of each section of the prototype, and the maximum opening stroke time TK and the maximum closing stroke time TG of the upper damper of the prototype;

[0023] After the unit is powered on, obtain the actual maximum opening stroke time Tak and the actual maximum closing stroke time Tag of the unit's damper.

[0024] When Tak and TK are not equal, if Tak is greater than TK, the opening time of the damper to complete each interval is TKn = tkn + (Tak - TK) / n; if Tak is less than TK, the opening time of the damper to complete each interval is TKn = tkn - (TK - Tak) / n. When Tag and TG are not equal, if Tag is greater than TG, the closing time of the damper to complete each interval is TGn = tgn + (Tag - TG) / n; if Tag is less than TG, the closing time of the damper to complete each interval is TGn = tgn - (TG - Tag) / n.

[0025] The present invention has at least the following beneficial effects: The total travel of the damper of the present invention consists of n consecutive intervals arranged sequentially along the opening direction of the damper. The opening time and closing time of the damper to complete each interval are measured in advance. After obtaining the target interval that the damper should reach, the opening travel time or closing travel time of the damper from the current interval to the target interval is calculated based on the opening time or closing time of the damper to complete each interval. The corresponding damper start time is added to this calculation. In this way, the running time of the damper can be determined more precisely. Then, the damper is controlled to move according to the running time, so that the damper can stop precisely at the ideal opening position according to the fan speed. Attached Figure Description

[0026] Figure 1 This is a flowchart illustrating a method for controlling the damper of a range hood according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the total stroke of the damper according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the damper control device of a range hood according to an embodiment of the present invention.

[0029] The attached diagram is labeled as follows: target interval determination module 100, damper opening time module 200, damper closing time module 300, and damper control operation module 400. Detailed Implementation

[0030] This disclosure provides the following description with reference to the accompanying drawings to aid in a full understanding of the various embodiments of the disclosure as defined by the claims and their equivalents. The description includes various specific details to aid understanding, but these details should be considered exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of this disclosure. Furthermore, for clarity and brevity, descriptions of the functions and constructions of the disclosure may be omitted.

[0031] The terms and words used in the following description and claims are not limited to their literal meaning, but are merely used by the inventors to enable a clear and consistent understanding of this disclosure. Therefore, it will be clear to those skilled in the art that the following description of various embodiments of this disclosure is provided for illustrative purposes only, and not to limit the disclosure as defined by the appended claims and their equivalents.

[0032] The terms “having,” “may have,” “comprising,” or “may include” as used in the various embodiments of this disclosure indicate the presence of the corresponding functions, operations, elements, etc., disclosed, but do not limit one or more additional functions, operations, elements, etc. Furthermore, it should be understood that the terms “comprising” or “having” as used in the various embodiments of this disclosure are intended to indicate the presence of features, numbers, operations, elements, components, or combinations thereof described in the specification, but do not exclude the presence or addition of one or more other features, numbers, operations, elements, components, or combinations thereof.

[0033] It should be understood that when an element (e.g., the first element) is “connected” to another element (e.g., the second element), the element can be directly connected to the other element, or there can be an intermediary element (e.g., the third element) between the element and the other element.

[0034] Before providing a detailed description of this invention, it is necessary to explain the hardware structure involved. Existing range hoods include an air damper, a driver, and a controller. The air damper is a device used to control the airflow in the duct; specifically, it can be a louver, which changes the airflow by rotating. The driver is connected to the air damper, and the controller is electrically connected to the driver. The controller issues control commands, and the driver controls the air damper's movement according to these commands. Therefore, this invention controls the driver from the controller's perspective.

[0035] Embodiments of the present invention provide a method for controlling the damper of a range hood, such as... Figure 1 As shown, it includes the following steps:

[0036] S100: Obtain the fan speed and determine the target range that the damper corresponding to the fan speed should reach based on the preset mapping relationship. The total travel of the damper consists of n consecutive intervals arranged in sequence along the opening direction of the damper. The opening and closing times of the damper to complete each interval are measured in advance, and n is a positive integer greater than 2.

[0037] The controller can begin executing step S100 when the fan speed changes or after the user activates the damper control function. After each speed change, the controller can cache the fan speed position. Therefore, the controller can read the fan speed information from the corresponding register. Alternatively, the controller can be connected to sensors such as a wind speed sensor to determine the fan speed based on wind speed or other parameters. To ensure optimal fan operation, each fan speed has an optimal damper opening, meaning the damper should be opened to the position corresponding to the fan speed. This mapping relationship can be established in advance through measurement and can be stored in the controller in tabular form.

[0038] The total stroke of a damper refers to the total distance the damper must travel from a fully closed state to a fully open state. The total stroke for opening is the same as the total stroke for closing, but due to the actuator, the time required for the damper to move from a fully closed state to a fully open state is different from the time required for the damper to move from a fully open state to a fully closed state. For example... Figure 2 As shown, the damper's total travel distance can be pre-arranged into n consecutive intervals along the opening direction. Each interval can be equidistant. The opening and closing times of the damper completing each interval are pre-measured, where n is a positive integer greater than 2. The opening time of each interval refers to the time required for the damper to move along the opening direction and complete each interval, and the closing time refers to the time required for the damper to move along the closing direction and complete each interval.

[0039] Since the range of positions contained in each interval is fixed, after determining the position where the damper should be opened corresponding to the fan speed, we then determine which interval the damper should fall into. The interval into which the damper should fall is the target interval, that is, the interval where the damper should move.

[0040] Afterwards, the controller can obtain the current range of the damper. When the range hood is turned on, the damper has an initial position and a corresponding initial range. The controller will record this initial range. Therefore, when the gear is changed for the first time, the current range of the damper is the initial range. After changing the gear, the damper is in a new range, and the controller will record the new range. When the user wants to change the gear again, the current range of the damper is the newly recorded range.

[0041] After obtaining the current interval of the damper, determine the sorting relationship between the target interval and the current interval of the damper. If the target interval is the same as the current interval of the damper, the position of the damper does not need to be changed. If the target interval is after the current interval of the damper, proceed to step S210. If the target interval is before the current interval of the damper, proceed to step S220.

[0042] S210: Based on the opening time of the damper to complete each interval, calculate the opening travel time of the damper from the current interval to the target interval, add the opening travel time to the preset damper start time when the damper opens, and obtain the running time of the damper.

[0043] The opening time of the damper for each interval has been measured in advance. Therefore, if the target interval is after the current interval where the damper is currently located, the damper moves in the opening direction. The opening time of all intervals from the current interval to the target interval can be accumulated to obtain the opening travel time. Considering that the damper also needs time to start when it opens, and the start time of the damper when it opens can be measured in advance, the sum of the opening travel time and the start time of the damper when it opens is the running time of the damper.

[0044] S220: Based on the closing time of the damper after it has completed each interval, calculate the closing travel time of the damper from the current interval to the target interval, and add the preset damper start time when the damper closes to obtain the damper's running time.

[0045] The closing time of the damper after each interval has been measured in advance. Therefore, if the target interval is before the current interval in which the damper is currently located, the damper moves in the closing direction. The closing time of all intervals from the current interval to the target interval can be accumulated to obtain the closing travel time. Considering that the damper also needs time to start when closing, and the start time of the damper when closing can be measured in advance, the sum of the closing travel time and the start time of the damper when closing is the running time of the damper.

[0046] S300: Controls the damper to move according to the running time.

[0047] The controller then controls the damper to move according to a predetermined running time. This allows for precise control of the damper's movement to the target area, ensuring it stops accurately in the ideal open position based on the fan speed. Specifically, the controller sends commands to the actuator connected to the damper to control the actuator's running time, which in turn controls the damper's movement time.

[0048] In some embodiments, step S210, which calculates the opening travel time of the damper from the current interval to the target interval, specifically includes: summing up the opening time of the damper for each interval between the current interval and the target interval, half of the opening time of the damper for the current interval, and half of the opening time of the damper for the target interval to obtain the opening travel time.

[0049] In step S220, the step of calculating the closing travel time of the damper from the current interval to the target interval specifically includes: adding up the closing time of the damper when it moves through each interval between the current interval and the target interval, half of the closing time of the damper when it moves through the current interval, and half of the closing time of the damper when it moves through the target interval to obtain the closing travel time.

[0050] Considering that this embodiment divides the total travel of the damper into n consecutive intervals, the larger the value of n, the higher the control precision. However, in practical applications, the value of n cannot be very large. Therefore, when the value of n is small, the damper needs time to move from the current interval to the next interval, and the damper also needs time to enter the target interval and move to the designated position within the target interval. When the damper moves along the opening direction, Figure 2 For example, the damper is currently located in interval 2, but it takes time for the damper to move from its current position to the boundary between interval 2 and interval 3. Similarly, it also takes time for the damper to move from the boundary between interval 5 and interval 6 to its target position. Therefore, Figure 2 In this system, the opening travel time of the damper from the current interval to the target interval is the sum of half the opening time of interval 2, half the opening time of interval 3, half the opening time of interval 4, half the opening time of interval 5, and half the opening time of interval 6. Similarly, this also applies to the damper moving in the closing direction. This makes the calculation of the damper's running time more accurate and improves the precision of controlling the damper's movement.

[0051] In some embodiments, before step S100, the following steps are further included:

[0052] The opening time (tkn) and closing time (tgn) of each section of the prototype, as well as the maximum opening stroke time (TK) and maximum closing stroke time (TG) of the damper, were obtained on the prototype. The prototype is a sample of a range hood manufactured specifically for measuring the aforementioned tkn, tgn, TK, and TG parameters, offering the advantage of convenient measurement; these parameters can all be measured in advance by staff. Specifically, the maximum opening stroke time (TK) of the damper refers to the time required for the damper to move from a fully closed state to a fully open state, and the maximum closing stroke time (TG) refers to the time required for the damper to move from a fully open state to a fully closed state.

[0053] After the entire unit is powered on, the actual maximum opening stroke time (Tak) and the actual maximum closing stroke time (Tag) of the entire unit's damper are obtained. The data obtained after the range hood is powered on and operating is more accurate; therefore, Tak and TK may not be equal, and Tag and TG may also not be equal.

[0054] When Tak and TK are not equal, if Tak is greater than TK, the opening time of the damper to complete each interval is TKn = tkn + (Tak - TK) / n; if Tak is less than TK, the opening time of the damper to complete each interval is TKn = tkn - (TK - Tak) / n. In other words, the difference between Tak and TK is distributed among n intervals. When Tak and TK are equal, the opening time of the damper to complete each interval is TKn = tkn. Similarly, when Tag and TG are not equal, if Tag is greater than TG, the closing time of the damper to complete each interval is TGn = tgn + (Tag - TG) / n; if Tag is less than TG, the closing time of the damper to complete each interval is TGn = tgn - (TG - Tag) / n. In other words, the difference between Tag and TG is distributed among n intervals. When Tag and TG are equal, the closing time of the damper to complete each interval is TGn = tgn. Therefore, this embodiment introduces two sets of comparison values: the sampled prototype values ​​TK and TG, and the actual whole machine values ​​Tak and Tag. The purpose is to eliminate the problem of inaccurate positioning caused by the slight differences in the performance of each motor and the gaps in the structure by comparing the values ​​between TK and Tak, as well as TG and Tag. This can reduce errors, make the calculation of the damper's running time more accurate, and further improve the precision of controlling the damper's movement.

[0055] Embodiments of the present invention provide a damper control device for a range hood, such as... Figure 3 As shown, it includes:

[0056] The target interval determination module 100 is used to obtain the fan speed and determine the target interval that the damper corresponding to the fan speed should reach according to the preset mapping relationship. The total damper stroke consists of n consecutive intervals arranged in sequence along the damper opening direction. The opening time and closing time of the damper to complete each interval are measured in advance, and n is a positive integer greater than 2.

[0057] The damper opening time module 200 is used to calculate the opening travel time of the damper from the current interval to the target interval when the target interval is after the current interval where the damper is currently located, based on the opening time of the damper to complete each interval. The opening travel time is added to the preset damper start time when the damper opens to obtain the running time of the damper.

[0058] The damper closing time module 300 is used to calculate the closing travel time of the damper from the current interval to the target interval when the target interval is before the current interval in which the damper is currently located, based on the closing time of the damper after completing each interval. The closing travel time is added to the preset damper start time when the damper closes to obtain the damper running time.

[0059] The damper control operation module 400 is used to control the movement of the damper according to the running time.

[0060] In some embodiments, the damper opening time module 200 is used to sum up the opening time of the damper when it completes each interval between the current interval and the target interval, half of the opening time of the damper when it completes the current interval, and half of the opening time of the damper when it completes the target interval to obtain the opening travel time; the damper closing time module 300 is used to sum up the closing time of the damper when it completes each interval between the current interval and the target interval, half of the closing time of the damper when it completes the current interval, and half of the closing time of the damper when it completes the target interval to obtain the closing travel time.

[0061] In some embodiments, a time calculation module is further included, which is used for:

[0062] On the prototype, obtain the opening time tkn of each section of the prototype, the closing time tgn of each section of the prototype, and the maximum opening stroke time TK and the maximum closing stroke time TG of the upper damper of the prototype;

[0063] After the unit is powered on, obtain the actual maximum opening stroke time Tak and the actual maximum closing stroke time Tag of the unit's damper.

[0064] When Tak and TK are not equal, if Tak is greater than TK, the opening time of the damper to complete each interval is TKn = tkn + (Tak - TK) / n; if Tak is less than TK, the opening time of the damper to complete each interval is TKn = tkn - (TK - Tak) / n. When Tag and TG are not equal, if Tag is greater than TG, the closing time of the damper to complete each interval is TGn = tgn + (Tag - TG) / n; if Tag is less than TG, the closing time of the damper to complete each interval is TGn = tgn - (TG - Tag) / n.

[0065] For a detailed description of the damper control device of the range hood, please refer to the embodiments in the section on damper control method of the range hood, which will not be repeated here.

[0066] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention, but it should not be construed as limiting the specific implementation of the invention to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. A method for controlling the damper of a range hood, characterized in that, Includes the following steps: The fan speed is obtained, and the target range that the damper corresponding to the fan speed should reach is determined according to the preset mapping relationship. The total travel of the damper consists of n consecutive ranges arranged in sequence along the opening direction of the damper. The opening time and closing time of the damper to complete each range are measured in advance, and n is a positive integer greater than 2. When the target interval is after the current interval where the damper is currently located, the opening travel time of the damper from the current interval to the target interval is calculated based on the opening time of the damper to complete each interval. The opening travel time is added to the preset damper start time when the damper opens to obtain the damper running time. When the target interval is before the current interval where the damper is currently located, the closing travel time of the damper from the current interval to the target interval is calculated based on the closing time of the damper after it has completed each interval. The closing travel time is then added to the preset damper start time when the damper closes to obtain the damper's running time. The control damper moves according to the stated operating time.

2. The damper control method for a range hood according to claim 1, characterized in that, The step of calculating the opening travel time of the damper from the current interval to the target interval specifically includes: adding up the opening time of the damper to each interval between the current interval and the target interval, half of the opening time of the damper to the current interval, and half of the opening time of the damper to the target interval to obtain the opening travel time; The step of calculating the closing travel time of the damper from the current interval to the target interval specifically includes: adding up the closing time of the damper in each interval between the current interval and the target interval, half of the closing time of the damper in the current interval, and half of the closing time of the damper in the target interval to obtain the closing travel time.

3. The damper control method for a range hood according to claim 1, characterized in that, Before the step of obtaining the fan speed and determining the target range that the damper corresponding to the fan speed should reach based on a preset mapping relationship, the following steps are also included: On the prototype, obtain the opening time tkn of each section of the prototype, the closing time tgn of each section of the prototype, and the maximum opening stroke time TK and the maximum closing stroke time TG of the upper damper of the prototype; After the unit is powered on, obtain the actual maximum opening stroke time Tak and the actual maximum closing stroke time Tag of the unit's damper. When Tak and TK are not equal, if Tak is greater than TK, the opening time of the damper to complete each interval is TKn = tkn + (Tak - TK) / n; if Tak is less than TK, the opening time of the damper to complete each interval is TKn = tkn - (TK - Tak) / n. When Tag and TG are not equal, if Tag is greater than TG, the closing time of the damper to complete each interval is TGn = tgn + (Tag - TG) / n; if Tag is less than TG, the closing time of the damper to complete each interval is TGn = tgn - (TG - Tag) / n.

4. A damper control device for a range hood, characterized in that, include: The target interval determination module (100) is used to obtain the fan speed and determine the target interval that the damper corresponding to the fan speed should reach according to the preset mapping relationship; wherein, the total travel of the damper consists of n consecutive intervals arranged in sequence along the opening direction of the damper, and the opening time and closing time of the damper to complete each interval are measured in advance, and n is a positive integer greater than 2. The damper opening time module (200) is used to calculate the opening travel time of the damper from the current interval to the target interval based on the opening time of the damper to complete each interval when the target interval is after the current interval where the damper is currently located. The opening travel time is added to the preset damper start time when the damper opens to obtain the running time of the damper. The damper closing time module (300) is used to calculate the closing travel time of the damper from the current interval to the target interval based on the closing time of the damper after it has completed each interval when the target interval is before the current interval where the damper is currently located. The closing travel time is added to the preset damper start time when the damper closes to obtain the running time of the damper. The damper control operation module (400) is used to control the damper to move according to the operation time.

5. The damper control device for a range hood according to claim 4, characterized in that, The damper opening time module (200) is used to accumulate the opening time of the damper when it completes each interval between the current interval and the target interval, half of the opening time of the damper when it completes the current interval, and half of the opening time of the damper when it completes the target interval, to obtain the opening stroke time. The damper closing time module (300) is used to accumulate the closing time of each interval between the current interval and the target interval, half of the closing time of the damper when it completes the current interval, and half of the closing time of the damper when it completes the target interval to obtain the closing travel time.

6. The damper control device for a range hood according to claim 4, characterized in that, It also includes a time calculation module, which is used for: On the prototype, obtain the opening time tkn of each section of the prototype, the closing time tgn of each section of the prototype, and the maximum opening stroke time TK and the maximum closing stroke time TG of the upper damper of the prototype; After the unit is powered on, obtain the actual maximum opening stroke time Tak and the actual maximum closing stroke time Tag of the unit's damper. When Tak and TK are not equal, if Tak is greater than TK, the opening time of the damper to complete each interval is TKn = tkn + (Tak - TK) / n; if Tak is less than TK, the opening time of the damper to complete each interval is TKn = tkn - (TK - Tak) / n. When Tag and TG are not equal, if Tag is greater than TG, the closing time of the damper to complete each interval is TGn = tgn + (Tag - TG) / n; if Tag is less than TG, the closing time of the damper to complete each interval is TGn = tgn - (TG - Tag) / n.

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