Self-cleaning fresh air system current threshold adaptive adjustment method

Abstract

The application provides a self-cleaning fresh air system current threshold self-adaptive adjustment method, a power supply supplies power to a circuit through a controller, and working current in the circuit is measured; the working state of a moving motor and a brush motor in the current is judged through the working current; when the moving motor works, the actual current of the moving motor is compared with a moving motor current threshold to judge the position of the moving motor, and the moving motor reverses when the moving motor is at a limit position; the torque of the moving motor is obtained according to the actual current of the moving motor, and the torque of the brush motor is obtained according to the actual current of the brush motor. The technical scheme can quickly and accurately judge the motor working in the circuit and meet the working requirements of different motors.

Description

Technical Field

[0001] This invention relates to the field of fresh air system technology, and more specifically, to an adaptive adjustment method for the current threshold of a self-cleaning fresh air system. Background Technology

[0002] A fresh air system is a mechanical ventilation structure that cools the indoor space or cabinet by drawing in cool outdoor air. Existing fresh air systems typically include dust filters to prevent dust, insects, and particles from entering the room or cabinet. However, these filters are easily clogged by dust and insects over time, requiring regular cleaning or replacement. If not cleaned or replaced promptly, the filters will gradually become clogged, reducing ventilation capacity, affecting the normal operation of internal communication equipment, and resulting in high maintenance costs. Therefore, we have added a cleaning brush mechanism that simultaneously sweeps and vacuums, efficiently removing dust particles adsorbed on the filters and achieving a self-cleaning function.

[0003] The moving mechanism uses a moving motor to drive the cleaning component in a reciprocating motion, either up / down or left / right. Without a rotating brush, a fixed current threshold is set at the factory based on the motor's characteristics. When the cleaning component reaches its limit position, the current is detected to have reached the set maximum threshold, causing the motor to reverse and the cleaning component to continue moving in the other direction. With the introduction of a rotating brush, the drive power supply needs to provide current to both the moving motor and the brush motor. Initially, the moving motor and brush motor were designed to operate simultaneously. However, in actual use, it is often necessary for the moving motor to move the cleaning component to a certain position before the brush motor is driven separately for cleaning. In this case, the current threshold needs to be reset to simultaneously meet the requirements of switching and operating both load motors.

[0004] Publication number: CN108937804B, patent title: Drainage control method, dishwasher and computer-readable storage medium. This prior art document determines the drainage status by detecting whether the second operating current of the motor is less than or equal to a preset current threshold, thus avoiding situations where the drain pump runs dry or the water in the dishwasher is not completely drained. This technical solution only determines the water pump's drainage status based on the motor's current threshold; it cannot control or switch the motor's current threshold according to the drainage status.

[0005] Therefore, it is urgent to adaptively adjust the current threshold of the circuit according to the working state of the moving motor or brush motor in the circuit, so as to solve the problem of current threshold switching when the power supply drives the moving motor or brush motor alone, and to calculate the current threshold in the circuit when the moving motor or brush motor is driven alone. Summary of the Invention

[0006] In view of this, the present invention proposes an adaptive adjustment method for the current threshold of a self-cleaning fresh air system, which adjusts the current threshold in the circuit as needed.

[0007] The technical solution of this invention is implemented as follows: an adaptive adjustment method for the current threshold of a self-cleaning fresh air system, characterized in that: the...

[0008] S1. The power supply provides power to the circuit through the controller and detects the operating current in the circuit;

[0009] S2. Based on the voltage of the power supply and the detected operating current, obtain the resistance value in the circuit and determine the working status of the moving motor or brush motor in the circuit.

[0010] S3. Dynamically set the first current threshold or the second current threshold according to the working status of the moving motor and the brush motor in the circuit;

[0011] S4. The operating current is compared with the first current threshold or the second current threshold set in S3 to determine the movement limit position, and the moving motor reverses or stops.

[0012] Based on the above technical solutions, preferably, at the instant of power supply, the detection circuit measures the operating current I in the circuit; using the formula: The actual resistance R in the circuit is obtained, where U is the power supply voltage.

[0013] Based on the above technical solution, preferably, the resistance of the moving motor is R1, the resistance of the brush motor is R2, and the parallel resistance between the brush motor and the moving motor is R. s , Using the actual resistance value R and the resistance value of R1 and R s By comparing the resistance values, it can be determined whether the moving motor works alone or the moving motor and the brush motor work in parallel in the circuit.

[0014] Based on the above technical solutions, preferably, when the mobile motor works alone, the operating current detected in the circuit is I1; at this time, the first current threshold is M1.

[0015] Based on the above technical solutions, preferably, when the mobile motor and the brush motor work in parallel, the operating current in the circuit is detected to be I2; at this time, the second current threshold is M2.

[0016] Based on the above technical solution, preferably, the first current threshold M1 is compared with the working current I1 in the circuit. When the working current I1 in the circuit is greater than the first current threshold M1, the moving motor reaches the limit position and the moving motor reverses or stops.

[0017] Based on the above technical solution, preferably, the second current threshold M2 is compared with the working current I2 in the circuit. When the working current I2 in the circuit is greater than the second current threshold M2, the moving motor reaches the limit position and the moving motor reverses or stops.

[0018] The adaptive adjustment method for the current threshold of the self-cleaning fresh air system of the present invention has the following advantages over the prior art:

[0019] (1) Determine whether the motor or the brush motor is working in the circuit based on the current detected in the circuit, and measure the working current of the motor or the brush motor. Determine whether the motor is reversing or stopping based on the comparison of the working current with the first current threshold or the second current threshold.

[0020] (2) The resistance value in the circuit is calculated by using the working current. The working status of the moving motor and the brush motor in the working circuit is judged by comparing the resistance value with the resistance value of the moving motor and the parallel resistance value of the moving motor and the brush motor. The judgment is more accurate and convenient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0022] Figure 1 This is a flowchart of the adaptive adjustment method for the current threshold of the self-cleaning fresh air system of the present invention.

[0023] Figure 2 The circuit diagram shows the adaptive adjustment method for the current threshold of the self-cleaning fresh air system according to the present invention. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1:

[0026] like Figure 1 and Figure 2 As shown, the adaptive adjustment method for the current threshold of a self-cleaning fresh air system includes the following steps:

[0027] S1. The power supply provides power to the circuit through the controller and detects the operating current in the circuit;

[0028] S2. Based on the voltage of the power supply and the detected operating current, obtain the resistance value in the circuit and determine the working status of the moving motor or brush motor in the circuit.

[0029] S3. Dynamically set the first current threshold or the second current threshold according to the working status of the moving motor and the brush motor in the circuit;

[0030] S4. The operating current is compared with the first current threshold or the second current threshold set in S3 to determine the movement limit position, and the moving motor reverses or stops.

[0031] At the instant the power supply is applied, the detection circuit measures the operating current in the circuit as I1; at this moment, the induced electromotive force in the circuit is E = 0. Neglecting the time constant of the electrical components, the formula is used: Obtain the actual resistance R in the circuit, where U is the power supply voltage.

[0032] The resistance of the moving motor is R1, the resistance of the brush motor is R2, and the parallel resistance between the brush motor and the moving motor is R. s , Using the actual resistance value R, the resistance values ​​of R1, R2, and R... s By comparing the resistance values, it can be determined whether the moving motor works alone or the moving motor and the brush motor work in parallel in the circuit.

[0033] The actual resistance R in the circuit is calculated based on the magnitude of the operating current. Since the actual resistance R in the circuit is closest to the resistance R1 of the moving motor, the moving motor is working independently at this time.

[0034] When the value of R is closest to the value of R1, the moving motor works alone in the circuit. The induced electromotive force E1 of the moving motor and the inductance of the moving motor windings will affect the measured actual resistance R. Therefore, the actual resistance R is only close to R1, not equal to it.

[0035] Since the moving motor operates within a certain range, when it reaches its limit position, the moving component driven by the motor stops moving, and the resistance of the actual current I1 of the moving motor increases rapidly. At this point, the moving motor needs to immediately reverse, driving the moving component to move in the opposite direction. Based on multiple experiments, a first current threshold M1 for the moving motor was obtained. When the operating current I1 in the circuit is compared with the first current threshold M1, if the actual current I1 of the moving motor is greater than the first current threshold M1, the moving motor has reached its limit position, at which point it reverses or stops. This design makes the entire device more intelligent, increases its working efficiency, and protects the moving motor.

[0036] Example 2:

[0037] like Figure 1 Or as shown in Figure 2, the adaptive adjustment method for the current threshold of the self-cleaning fresh air system includes the following steps:

[0038] S1. The power supply provides power to the circuit through the controller and detects the operating current in the circuit.

[0039] If the motor rotor cannot rotate due to excessive load, the current in the motor coil is the operating current. The operating current in the circuit is obtained through a detection circuit.

[0040] S2. Based on the voltage of the power supply and the operating current detected by the controller, obtain the resistance value in the circuit and determine the working status of the moving motor or brush motor in the circuit.

[0041] Having obtained the operating current in S1, and with the power supply voltage constant, we can determine, based on the actual situation, whether the moving motor, the brush motor, or both the moving motor and the brush motor are actually working in the circuit.

[0042] At the instant the power supply is applied, the detection circuit measures the operating current in the circuit as I2; at this moment, the induced electromotive force in the circuit is E = 0. Neglecting the time constant of the electrical components, the formula is used: Obtain the actual resistance R in the circuit, where U is the power supply voltage.

[0043] The resistance of the moving motor is R1, the resistance of the brush motor is R2, and the parallel resistance between the brush motor and the moving motor is R. s , Using the actual resistance value R, the resistance values ​​of R1, R2, and R... s By comparing the resistance values, it can be determined whether the moving motor works alone or the moving motor and the brush motor work in parallel in the circuit.

[0044] The actual resistance R in the circuit is calculated based on the magnitude of the operating current. The resistance R in the circuit is then compared to the resistance of the parallel connection between the moving motor and the brush motor. s At this point, the moving motor and the brush motor are connected in parallel in the circuit.

[0045] When the value of R is related to R s When the values ​​are closest, the moving motor and the brush motor operate in parallel in the circuit. The induced electromotive force E2 of the moving motor, as well as the inductance of the windings of both the moving motor and the brush motor, will affect the measured actual resistance R. Therefore, the actual resistance R and R2 are closely related. s They are close, but not equal.

[0046] Since the moving motor operates within a certain range, when it reaches its limit position, the moving component driven by the motor stops moving, and the resistance of the operating current I2 in the circuit increases rapidly. At this point, the moving motor needs to immediately reverse, driving the moving component to move in the opposite direction. Based on multiple experiments, a second current threshold M2 for the moving motor was obtained. When the operating current I2 in the circuit is compared with the second current threshold M2, if the actual current I2 of the moving motor is greater than the second current threshold M2, the moving motor has reached its limit position, at which point it reverses or stops. This design makes the entire device more intelligent, increases its working efficiency, and also protects the moving motor.

Claims

1. An adaptive adjustment method for the current threshold of a self-cleaning fresh air system, characterized in that, The steps include the following: S1. The power supply provides power to the circuit through the controller and detects the operating current in the circuit; S2. Based on the voltage of the power supply and the detected working current, obtain the resistance value in the circuit and determine the working status of the moving motor or brush motor in the circuit; the moving motor is used to drive the sweeping parts to move up and down or left and right back and forth, and the brush motor is used to drive the brush to rotate. S3. Dynamically set the first current threshold or the second current threshold according to the working status of the moving motor and the brush motor in the circuit; S4. The operating current is compared with the first current threshold or the second current threshold set in S3 to determine whether the moving motor has moved to the limit position, and the moving motor reverses or stops. When the mobile motor operates independently, the operating current detected in the circuit is: ; At this time, the first current threshold is When the moving motor and the brush motor are connected in parallel, the operating current detected in the circuit is... At this time, the second current threshold is .

2. The adaptive adjustment method for the current threshold of the self-cleaning fresh air system as described in claim 1, characterized in that: At the instant the power supply is activated, the operating current in the detection circuit is measured. I Using the formula: R = To obtain the actual resistance in the circuit. R The resistance value, where, U This is the power supply voltage.

3. The adaptive adjustment method for the current threshold of the self-cleaning fresh air system as described in claim 2, characterized in that: The resistance of the moving motor is The resistance of the brush motor is The parallel resistance of the brush motor and the moving motor is , = Using the actual resistance value R and resistance and By comparing the resistance values, it can be determined whether the moving motor works alone or the moving motor and the brush motor work in parallel in the circuit.

4. The adaptive adjustment method for the current threshold of the self-cleaning fresh air system as described in claim 3, characterized in that: First current threshold With the operating current in the circuit Comparison, when the operating current in the circuit Greater than the first current threshold When the moving motor reaches its limit position, it either reverses or stops.

5. The adaptive adjustment method for the current threshold of the self-cleaning fresh air system as described in claim 3, characterized in that: Second current threshold With the operating current in the circuit Comparison, when the operating current in the circuit Greater than the second current threshold When the moving motor reaches its limit position, it either reverses or stops.

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