Unbalance load detection method

Abstract

The invention discloses an unbalance loading detection method. Whether an unbalance loading condition exists or not is detected while weighing is carried out. When the weight value is displayed, the left / right and front / rear stress conditions are displayed at the same time. During multiple times of measurement, a measurer can keep the left / right and front / rear stress conditions consistent, so that the influence on a measurement result caused by the change of a measurement position is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic scale measurement, and particularly to a method for off-center load detection. Background Art

[0002] Currently, electronic scales (such as body scales and kitchen scales) on the market that use a set of four sensors generally bridge the four sensors, supply power from E+ and E-, and read measurement signals from S+ and S-. When the measurement object (person or object) is in different positions on the scale surface, the measurement signals output by the sensor group will vary, resulting in an inconsistent displayed weight value with the actual value, that is, the "off-center load" phenomenon. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a method for off-center load detection.

[0004] To solve the above problems, the present invention adopts the following technical solutions.

[0005] A method for off-center load detection includes the following steps:

[0006] Step 1: Weigh on the scale;

[0007] Step 2: The sensor group of the scale body detects their respective pressures and converts them into electrical signals for transmission to the main board MCU;

[0008] Step 3: The MCU calculates 'weight', 'left side force of the scale', 'right side force of the scale', 'front side force of the scale', and'rear side force of the scale' respectively according to the signals of each connection point of the sensor group;

[0009] Step 4: The display screen displays the weight value, and at the same time displays 'left side force of the scale', 'right side force of the scale', 'front side force of the scale', and'rear side force of the scale'.

[0010] Step 5: According to the usage habit, the user keeps the 'left / right side force of the scale' and 'front / rear side force of the scale' consistent during multiple measurements.

[0011] The sensor group includes a first sensor, a second sensor, a third sensor, and a fourth sensor arranged on the scale body. The first sensor includes a resistor R1 and a resistor R2. The second sensor includes a resistor R3 and a resistor R4. The third sensor includes a resistor R5 and a resistor R6. The fourth sensor includes a resistor R7 and a resistor R8. The resistors R1, R2, R3, R4, R5, R6, R7, and R8 are all connected to the processor.

[0012] In calculating the "left / right side force of the scale", set the connection point of resistor R1 and resistor R2 as point E+, set the connection point of resistor R2 and resistor R3 as point AI1, set the connection point of resistor R3 and resistor R4 as point S+, set the connection point of resistor R4 and resistor R5 as point AI2, set the connection point of resistor R5 and resistor R6 as point E-, set the connection point of resistor R6 and resistor R7 as point AI3, set the connection point of resistor R7 and resistor R8 as point S-, set the connection point of resistor R8 and resistor R1 as point AI4, read the signals of AI2 or AI1, E- or E+, AI3 or AI4, and calculate the left side force condition through the signal difference between AI2 or AI1 and E- or E+; calculate the right side force condition through the signal difference between AI3 or AI4 and E- or E+).

[0013] In measuring the "front / rear side force of the scale", read the signals of AI1 or AI4, S+ or S-, AI2 or AI3, and calculate the front side force condition through the signal difference between AI1 or AI4 and S+ or S-; calculate the rear side force condition through the signal difference between AI2 or AI3 and S+ or S-.

[0014] Advantages of the present invention

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] 1. From the traditional sensor group measurement scheme, by increasing the reading of signals at each connection point of the sensor group, the left / right force detection and front / rear force detection are realized.

[0017] 2. On the premise of ensuring the measurement accuracy of the sensor group, the new functions of 'left / right' and 'front / rear' force detection are added. By prompting the force condition, the user is enabled to keep the measurement position consistent, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the scale body of the present invention.

[0019] Figure 2 It is a circuit schematic diagram of the sensor group of the present invention.

[0020] Figure 3 It is a diagram of the force value displayed on the display screen of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than 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 efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 to 3 ,

[0023] The main components of the weighing body:

[0024] 1. Sensor group (such as a set of four sensors in this case), generally distributed at the four corners of the weighing body. The sensors convert pressure into electrical signals and then transmit them to the main board.

[0025] 2. Main board, which collects the signals of each connection point of the sensor group. The MCU calculates the 'total pressure of the sensor group', 'pressure on the left side of the scale', 'pressure on the right side of the scale', 'pressure on the front side of the scale', and 'pressure on the rear side of the scale' respectively. Among them, the 'total pressure of the sensor group' is an absolute value, used to calculate the weight of the object to be measured; the 'pressure on the left side of the scale' and 'pressure on the right side of the scale' are relative values, used to calculate whether the forces on the left / right sides are consistent; the 'pressure on the front side of the scale' and 'pressure on the rear side of the scale' are relative values, used to calculate whether the forces on the front / rear sides are consistent.

[0026] 3. Display screen, used to prompt the user with information such as "weight value", "force on the left side of the scale", "force on the right side of the scale", "force on the front side of the scale", and "force on the rear side of the scale".

[0027] Specific measurement methods:

[0028] 1. Measuring weight: The main board MCU reads the signals of S+ and S- (total pressure of the sensor group) and calculates the weight value through calculation.

[0029] 2. Measuring the 'force on the left / right side of the scale': Read the signals of AI2 (or AI1), E- (or E+), and AI3 (AI4). Calculate the force on the left side through the signal difference between AI2 (or AI1) and E- (or E+); calculate the force on the right side through the signal difference between AI3 (AI4) and E- (or E+).

[0030] 3. Measuring the 'force on the front / rear side of the scale': Read the signals of AI1 (or AI4), S+ (or S-), and AI2 (AI3). Calculate the force on the front side through the signal difference between AI1 (or AI4) and S+ (or S-); calculate the force on the rear side through the signal difference between AI2 (AI3) and S+ (or S-).

[0031] Note: Among them, R9 and R10 are used to adjust the base voltage of each connection point of the sensor group to reasonably amplify the pressure signal of the sensor.

[0032] The main board MCU transmits the 'left / right side force conditions' and 'front / rear side force conditions' to the display screen. One implementation case is as follows: Divide the sum of 'left side force' and 'right side force' into 10 parts, and set 10 grids for each of 'left side force' and 'right side force'. Then display the 10 parts of the force on 'left side force' and 'right side force' respectively; Divide the sum of 'front side force' and'rear side force' into 10 parts, and set 10 grids for each of 'front side force' and'rear side force'. Then display the 10 parts of the force on 'front side force' and'rear side force' respectively.

[0033] As described above, it is only a preferred specific implementation manner of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A partial load detection method, characterized in that, It includes the following steps: Step 1: Weigh on the scale. Step 2: The sensor group of the scale body detects their respective pressures and converts them into electrical signals for transmission to the main board MCU. Step 3: The MCU calculates 'weight', 'left-side force of the scale', 'right-side force of the scale', 'front-side force of the scale', and 'back-side force of the scale' respectively according to the signals of each connection point of the sensor group. Step 4: The display screen shows the weight value and simultaneously shows 'left-side force of the scale', 'right-side force of the scale', 'front-side force of the scale', and 'back-side force of the scale'. Step 5: According to the usage habit, the user keeps the 'left / right-side force of the scale' and 'front / back-side force of the scale' consistent during multiple measurements.

2. A partial load detection method according to claim 1, wherein: The sensor group includes a first sensor, a second sensor, a third sensor, and a fourth sensor provided on the scale body. The first sensor includes a resistor R1 and a resistor R2. The second sensor includes a resistor R3 and a resistor R4. The third sensor includes a resistor R5 and a resistor R6. The fourth sensor includes a resistor R7 and a resistor R8. The resistors R1, R2, R3, R4, R5, R6, R7, and R8 are all connected to the processor.

3. A partial load detection method according to claim 3, wherein: When calculating the 'left / right-side force of the scale', set the connection point of resistor R1 and resistor R2 as point E+, the connection point of resistor R2 and resistor R3 as point AI1, the connection point of resistor R3 and resistor R4 as point S+, the connection point of resistor R4 and resistor R5 as point AI2, the connection point of resistor R5 and resistor R6 as point E-, the connection point of resistor R6 and resistor R7 as point AI3, the connection point of resistor R7 and resistor R8 as point S-, and the connection point of resistor R8 and resistor R1 as point AI4. Read the signals of AI2 or AI1, E- or E+, AI3 or AI4, and calculate the left-side force condition through the signal difference between AI2 or AI1 and E- or E+; calculate the right-side force condition through the signal difference between AI3 or AI4 and E- or E+).

4. A partial load detection method according to claim 3, wherein: When measuring the 'front / back-side force of the scale', read the signals of AI1 or AI4, S+ or S-, AI2 or AI3, and calculate the front-side force condition through the signal difference between AI1 or AI4 and S+ or S-; calculate the back-side force condition through the signal difference between AI2 or AI3 and S+ or S-.

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