Refrigerator electric drawer switch control method

Abstract

The invention discloses a refrigerator electric drawer opening and closing control method, the operation process of opening and closing a drawer is the same, and the method specifically comprises a starting stage, a weighing stage, an acceleration stage, a constant speed stage and a braking stage. According to energy conservation, the weight of the object in the drawer can be accurately determined by establishing a momentum model and matching a corresponding algorithm, physical components such as a weighing sensor do not need to be additionally arranged, different acceleration logic strategies are selected according to the calculated value of the weight of the object, operation is smooth, and the problems of shaking and even derailing caused by mismatching of the driving current and the object are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a method for controlling a switch of an electric drawer of a refrigerator. Background Art

[0002] Refrigerators are common household appliances in people's lives. With the improvement of living standards, users have higher and higher requirements for large volume and intelligence. In order to meet the needs of users, the size of refrigerators is enlarged, and the corresponding drawers are also enlarged. However, after the drawers are enlarged, it is particularly laborious to push and pull them, especially when they are fully loaded. In order to improve the user experience, many manufacturers have installed drive devices to realize the automatic opening and closing of drawers. The existing drive device drives the drawer to open or close in the same process, including three stages, namely the start-up acceleration stage, the uniform speed stage and the braking stage. In the start-up acceleration stage, the system accelerates the drawer from zero to a preset speed V with a preset acceleration A. In the uniform speed stage, the drive device drives the drawer to run at a uniform speed of speed V. In the braking stage, when the drawer moves to the specified position, the drive device decelerates the drawer from V to zero with a preset deceleration B. In the above operation process, especially in the start-up acceleration stage, in order to prevent startup failure, the output torque of the motor is usually adjusted to the highest, and the drawer is accelerated with a larger acceleration, resulting in a mismatch with the total weight of the drawer (drawer weight + weight of the load in the drawer), and a shaking phenomenon occurs. In severe cases, derailment may occur, which has potential safety hazards. In view of this, it is necessary to improve the existing technology. Summary of the invention

[0003] The object of the present invention is to provide a refrigerator electric drawer switch control method, aiming to solve at least one of the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned object, the technical solution adopted is as follows:

[0004] A refrigerator electric drawer switch control method, the drawer opening and closing operation process is the same, specifically including a starting stage, a weighing stage, an acceleration stage, a constant speed stage and a braking stage.

[0005] Preferably, the startup phase includes the following steps: the motor accelerates the drawer to v1 at a preset acceleration a1 and maintains the acceleration.

[0006] Preferably, the weighing stage comprises the following steps:

[0007] s1. According to the law of energy conservation, the following model is established: W MOTOR =E f +E C +E L (1);

[0008] Among them, W MOTOR Work done for motor output; E f E is the work done by the transmission system loss; CWork done to move the empty drawer; E L The work done to move the contents in the drawer, E f and E C All are fixed values ​​measured through experiments;

[0009] Transform formula (1) to get:

[0010] Among them, U is the working voltage of the motor; I is the working current of the motor; T is the working time of the motor; λ is the compensation coefficient, which is measured through experiments; m is the weight of the load in the drawer; v is the running speed of the drawer;

[0011] Substituting v1 into the above formula (2), we can calculate the weight of the load in the drawer as m1;

[0012] s2. The motor accelerates the drawer from v1 to v2 at a preset acceleration a2 and maintains the speed;

[0013] Substituting v2 into the above formula (2), we can calculate the weight of the load in the drawer as m2;

[0014] s3. The weighted average of the two calculation results is obtained to obtain the final drawer load weight m3;

[0015] The following formula is used: m3 = (m1 + m2) / 2 (3).

[0016] Preferably, the acceleration stage comprises the following steps: a comparison table between the weight m3 of the load in the drawer and the acceleration a3 is preset in the system, the acceleration a3 is determined by looking up the table according to the known m3, and the motor accelerates the drawer to v3 with the acceleration a3.

[0017] Preferably, the comparison table is as follows:

[0018] m3(kg) m3≤5 5＜m3≤8 8＜m3≤15 15＜m3≤25 m3＞25 <![CDATA[a3(m / s 2 )]]> a31 a32 a33 a34 a35

[0019] ; Among them, a31, a32, a33, a34 and a35 are all measured through experiments.

[0020] Preferably, the v3 is a system preset value.

[0021] Preferably, the constant speed stage comprises the following steps: the motor drives the drawer to run at a constant speed v3.

[0022] Preferably, the braking stage includes the following steps: when the drawer moves to a specified position, the motor decelerates the drawer from v3 to zero at a preset deceleration b.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention discloses a refrigerator electric drawer switch control method. According to the law of energy conservation, a momentum model is established and a corresponding algorithm is matched to accurately determine the weight of the load in the drawer. No external physical components such as a weighing sensor are required. Different acceleration logic strategies are selected according to the calculated value of the load weight to ensure smooth operation and avoid jitter or even derailment caused by mismatch between the driving current and the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a diagram of the drawer operation phase. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0028] like Figure 1 As shown, a preferred embodiment of the present invention provides a refrigerator electric drawer switch control method, which is suitable for opening and closing an electric drawer. The specific operation process includes: a starting stage, a weighing stage, an acceleration stage, a constant speed stage and a braking stage.

[0029] The startup phase includes the following steps: the motor accelerates the drawer to v1 at a preset acceleration a1 and maintains it.

[0030] The weighing phase includes the following steps:

[0031] s1. According to the law of energy conservation, the following model is established: W MOTOR =E f +E C +E L (1).

[0032] Among them, W MOTOR Work done for motor output; E f E is the work done by the transmission system loss; C Work done to move the empty drawer; E L The work done to move the contents in the drawer, E f and E C These are all constant values ​​measured through experiments. Of course, the values ​​measured for different models of refrigerators are different.

[0033] Transform formula (1) to get:

[0034] Among them, U is the working voltage of the motor; I is the working current of the motor; T is the working time of the motor; λ is the compensation coefficient, which is measured through experiments; m is the weight of the load in the drawer; v is the running speed of the drawer.

[0035] Perform the first weighing. Specifically, substitute v1 into the above formula (2) to calculate the weight of the load in the drawer as m1, and record it.

[0036] s2. The motor accelerates the drawer from v1 to v2 at a preset acceleration a2 and maintains it.

[0037] Weigh the drawer for the second time. Specifically, substitute v2 into the above formula (2) to calculate the weight of the drawer as m2, and record it.

[0038] s3. In order to ensure the measurement accuracy, the results of the two calculations are weighted and averaged to obtain the final weight of the load in the drawer m3. Specifically, the following formula is used: m3 = (m1 + m2) / 2 (3).

[0039] Among them, a1 is measured through experiments to ensure that the drawer starts successfully under full load, and a2 is measured through experiments to ensure that the drawer is accelerated from v1 to v2 in a short time. Both v1 and v2 are set values ​​and can be reasonably set according to needs. The total duration of the above starting stage and weighing stage is about 1-2 seconds.

[0040] The acceleration stage includes the following steps: The system has a preset comparison table between the weight m3 of the object in the drawer and the acceleration a3, which is as follows:

[0041] m3(kg) m3≤5 5＜m3≤8 8＜m3≤15 15＜m3≤25 m3＞25 <![CDATA[a3(m / s 2 )]]> a31 a32 a33 a34 a35

[0042] Among them, a31, a32, a33, a34 and a35 are all measured through experiments and match the corresponding m3, which ensures that the drawer does not shake during the acceleration process.

[0043] According to m3 calculated in the weighing stage, the acceleration a3 is determined by looking up the table, and the motor accelerates the drawer to v3 with the acceleration a3. v3 is the set value, which can be reasonably set according to needs.

[0044] The constant speed stage includes the following steps: the motor drives the drawer to run at a constant speed v3.

[0045] The braking stage includes the following steps: when the drawer moves to the specified position, specifically, the motor rotor position sensor calculates that the drawer has slid to a certain stroke, and then the motor decelerates the drawer from v3 to zero at a preset deceleration b. b is a set value, which can be reasonably set according to needs.

[0046] In summary, the refrigerator electric drawer switch control method described in the embodiment of the present invention, based on the law of conservation of energy, establishes a momentum model, and matches the corresponding algorithm to accurately determine the weight of the load in the drawer without the need for external physical components such as weighing sensors. Different acceleration logic strategies are selected according to the calculated value of the load weight to ensure smooth operation and avoid jitter or even derailment caused by mismatch between the driving current and the load.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refrigerator electric drawer switch control method, characterized in that: The operation process of opening and closing the drawer is the same, including the starting stage, weighing stage, acceleration stage, constant speed stage and braking stage.

2. A refrigerator electric drawer switch control method according to claim 1, characterized in that: The startup phase includes the following steps: the motor accelerates the drawer to v1 at a preset acceleration a1 and maintains the acceleration.

3. A refrigerator electric drawer switch control method according to claim 2, characterized in that: The weighing stage comprises the following steps: s1. According to the law of energy conservation, the following model is established: W MOTOR =E f +E C +E L (1); Among them, W MOTOR Work done for motor output; E f E is the work done by the transmission system loss; C Work done to move the empty drawer; E L The work done to move the contents in the drawer, E f and E C All are fixed values ​​measured through experiments; Transform formula (1) to get: Among them, U is the working voltage of the motor; I is the working current of the motor; T is the working time of the motor; λ is the compensation coefficient, which is measured through experiments; m is the weight of the load in the drawer; v is the running speed of the drawer; Substituting v1 into the above formula (2), we can calculate the weight of the load in the drawer as m1; s2. The motor accelerates the drawer from v1 to v2 at a preset acceleration a2 and maintains the speed; Substituting v2 into the above formula (2), we can calculate the weight of the load in the drawer as m2; s3. The weighted average of the two calculation results is obtained to obtain the final drawer load weight m3; The following formula is used: m3 = (m1 + m2) / 2 (3).

4. A refrigerator electric drawer switch control method according to claim 3, characterized in that: The acceleration stage includes the following steps: a comparison table between the weight m3 of the load in the drawer and the acceleration a3 is preset in the system, and the acceleration a3 is determined by looking up the table according to the known m3, and the motor accelerates the drawer to v3 with the acceleration a3.

5. A refrigerator electric drawer switch control method according to claim 4, characterized in that: The comparison table is as follows: Among them, a31, a32, a33, a34 and a35 are all measured through experiments.

6. A refrigerator electric drawer switch control method according to claim 4, characterized in that: The v3 is a system default value.

7. A refrigerator electric drawer switch control method according to claim 4, characterized in that: The constant speed stage includes the following steps: the motor drives the drawer to run at a constant speed v3.

8. A refrigerator electric drawer switch control method according to any one of claims 1 to 7, characterized in that: The braking stage includes the following steps: when the drawer moves to the specified position, the motor decelerates the drawer from v3 to zero at a preset deceleration b.

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