Electronic scale unbalance loading identification method

Abstract

The invention provides an electronic scale unbalance loading identification method, and the method comprises the steps: obtaining a first vacancy detection value, a second vacancy detection value and a third vacancy detection value of an electronic scale when the electronic scale is vacant; determining whether the electronic scale is horizontally placed according to a plurality of calibration values set by measurement, the first vacancy detection value, the second vacancy detection value and the third vacancy detection value; if the electronic scale is horizontally placed, acquiring a first load detection value, a second load detection value and a third load detection value of the electronic scale; and according to the plurality of calibration values set by measurement, the first vacancy detection value, the second vacancy detection value, the third vacancy detection value, the first load detection value, the second load detection value and the third load detection value, determining whether the electronic scale is unbalanced. The problems that a current unbalance loading detection circuit is very complex and high in cost are solved, and the problems that data of each independent sensor is collected at the same time and the collected data is huge are solved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic scale use, and in particular to a method for identifying an overload of an electronic scale. Background Art

[0002] With the development of the electronic scale industry, more and more types of electronic scales are becoming familiar and used by people, such as electronic platform scales, electronic floor scales, electronic table scales, and electronic car scales.

[0003] Since current electronic scales use the full-bridge drive principle, it is difficult to implement the overload reminder function when the scale is overloaded. However, when overload occurs, the measured data will deviate from the linear area after sensor calibration, thus affecting the measurement accuracy. Especially when the ground is not very flat, the overload problem will become non-negligible.

[0004] The current load-biasing functions on the market all use data from multiple independent sensors and the least squares method to perform data comparison operations. The circuit is very complex (each sensor needs to have an op amp, ADC, etc. added), the cost is expensive, and the data from each independent sensor needs to be collected at the same time, so the collected data is huge. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a method for identifying overload of an electronic scale, which can determine whether the electronic scale has overload by detecting the voltage values ​​of the differential detection points under different conditions through a first differential detection point and a second differential detection point formed by a Wheatstone bridge. This avoids the problem that the current circuit for overload detection is very complicated and costly, and also avoids the problem of simultaneously collecting data from each independent sensor and collecting huge amounts of data. This method can accurately and quickly detect the overload of the electronic scale.

[0006] The embodiment of the present application provides a method for identifying an overload of an electronic scale, wherein the electronic scale comprises a full-bridge circuit, wherein the full-bridge circuit comprises a Wheatstone bridge, wherein the Wheatstone bridge forms a first differential detection point and a second differential detection point, wherein the method comprises: when the electronic scale is idle, obtaining a first vacancy detection value, a second vacancy detection value and a third vacancy detection value that are stable within the same time period of the electronic scale, wherein the first vacancy detection value is a voltage value when the electronic scale is idle, the second vacancy detection value is a voltage value of the first differential detection point when the left half bridge is grounded when the electronic scale is idle, and the third vacancy detection value is a voltage value of the second differential detection point when the right half bridge is grounded when the electronic scale is idle; and determining a plurality of calibration values, the first vacancy detection value, the second vacancy detection value and the third vacancy detection value according to the set calibration values. value and the third vacancy detection value to determine whether the electronic scale is placed horizontally; if the electronic scale is placed horizontally, then obtain the first load detection value, the second load detection value and the third load detection value that are stable in the same time period of the electronic scale, the first load detection value is the voltage value when the target load is placed on the electronic scale, the second load detection value is the voltage value of the first differential detection point when the left half bridge is grounded when the target load is placed on the electronic scale, and the third load detection value is the voltage value of the second differential detection point when the right half bridge is grounded when the target load is placed on the electronic scale; determine whether the electronic scale is overloaded based on the measured and set multiple calibration values, the first vacancy detection value, the second vacancy detection value and the third vacancy detection value, the first load detection value, the second load detection value and the third load detection value.

[0007] Optionally, the full-bridge circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first MOS transistor, and a second MOS transistor, wherein one end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the other end of the first resistor, and the other end of the eighth resistor is connected to the other end of the first resistor. A voltage input point is formed between the first end and the other end of the first resistor, and the voltage input point is connected to an external power supply. A first differential detection point S- is formed between the other end of the second resistor and one end of the third resistor. A grounding point is formed between the other end of the fourth resistor and one end of the fifth resistor, and the grounding point is grounded. A second differential detection point S+ is formed between the other end of the sixth resistor and one end of the seventh resistor. The D pole of the first MOS tube is connected to the second differential detection point, the S pole of the first MOS tube is grounded, the G pole of the first MOS tube is connected to the first control end, the D pole of the second MOS tube is connected to the first differential detection point, the S pole of the second MOS tube is grounded, and the G pole of the second MOS tube is connected to the second control end.

[0008] Optionally, the full-bridge circuit also includes a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, wherein one end of the ninth resistor is connected to the G pole of the first MOS tube, the other end of the ninth resistor is connected to the first control end, one end of the tenth resistor is connected to the G pole of the first MOS tube, the other end of the tenth resistor is grounded, one end of the eleventh resistor is connected to the G pole of the second MOS tube, the other end of the eleventh resistor is connected to the second control end, one end of the twelfth resistor is connected to the G pole of the second MOS tube, and the other end of the twelfth resistor is grounded.

[0009] Optionally, the multiple calibration values ​​include a sensor accuracy error value, a weighing accuracy error value, a first ratio value and a second ratio value, wherein the sensor accuracy error value is determined by the following steps: the sensor accuracy error value is determined according to the repeatability error, structural limit error, and analog-to-digital converter error of multiple sensors in the electronic scale, wherein the weighing accuracy error value is determined by the following steps: the weighing accuracy error value is determined according to the accuracy requirement of the electronic scale.

[0010] Optionally, the first proportion value and the second proportion value are determined by the following steps: when the electronic scale leaves the factory and is idle, obtaining the first calibration voltage value of the full-bridge circuit; when the electronic scale leaves the factory and is idle, grounding the first differential detection point and the second differential detection point, and obtaining the second calibration voltage value and the third calibration voltage value of the full-bridge circuit; when the electronic scale leaves the factory and a target load is placed on it, obtaining the fourth calibration voltage value of the full-bridge circuit; when the electronic scale leaves the factory and a target load is placed on it, grounding the first differential detection point and the second differential detection point, and obtaining the fifth calibration voltage value and the sixth calibration voltage value of the full-bridge circuit; determining the first proportion value according to the first calibration voltage value, the fourth calibration voltage value, the second calibration voltage value and the fifth calibration voltage value; determining the second proportion value according to the first calibration voltage value, the fourth calibration voltage value, the third calibration voltage value and the sixth calibration voltage value.

[0011] Optionally, the first ratio value is determined by the following formula:

[0012]

[0013] Among them, K1 is the first proportional value, V dif1 is the fourth calibration voltage value, V dif0 is the first calibration voltage value, V 1+ is the fifth calibration voltage value, V 0+ is the second calibration voltage value;

[0014] The second ratio value is determined by the following formula:

[0015]

[0016] Among them, K2 is the second ratio value, V dif1 is the fourth calibration voltage value, V dif0 is the first calibration voltage value, V 1- is the sixth calibration voltage value, V 0- is the third calibration voltage value.

[0017] Optionally, the following steps are performed to determine whether the electronic scale is placed horizontally: determine a first horizontal calculation value based on a first vacancy detection value and a first calibration voltage value; determine a second horizontal calculation value based on a second vacancy detection value, a second calibration voltage value and a first ratio value; determine a third horizontal calculation value based on a third vacancy detection value, a third calibration voltage value and a second ratio value; calculate a first offset load value and a second offset load value based on the first horizontal calculation value, the second horizontal calculation value and the third horizontal calculation value; determine whether the first offset load value and the second offset load value are both smaller than a sensor accuracy error value; if the first offset load value and the second offset load value are both smaller than the sensor accuracy error value, determine that the electronic scale is placed horizontally; if the first offset load value and the second offset load value are not both smaller than the sensor accuracy error value, determine that the electronic scale is not placed horizontally.

[0018] Optionally, the first eccentric load value and the second eccentric load value are calculated by the following formula:

[0019] E1=|a1-b1|, E2=|a1-c1|,

[0020] Among them, E1 is the first eccentric load value, E2 is the second eccentric load value, a1 is the first horizontal calculation value, b1 is the second horizontal calculation value, and c1 is the third horizontal calculation value.

[0021] The first level calculation value is calculated by the following formula:

[0022] a1=V dif0测0 -V dif0 ,

[0023] Among them, V dif0测0 is the first vacancy detection value, V dif0 is the first calibration voltage value, a1 is the first level calculation value,

[0024] The second level calculation value is calculated by the following formula:

[0025] b1=K1×(V 测0+ -V 0+ )

[0026] Among them, V 测0+ is the second vacancy detection value, V 0+ is the second calibration voltage value, b1 is the second level calculation value, K1 is the first ratio value,

[0027] The third level calculation value is calculated by the following formula:

[0028] c1=K2×(V 测0- -V 0- ),

[0029] Among them, V 测0- is the third vacancy detection value, V0- is the third calibration voltage value, c1 is the third level calculation value, and K2 is the second proportional value.

[0030] Optionally, whether the electronic scale is overloaded is determined by the following steps: determining a first load calculation value based on a first load detection value and a first empty detection value; determining a second load calculation value based on a second load detection value, a second empty detection value and a first proportional value; determining a third load calculation value based on a third load detection value, a third empty detection value and a second proportional value; calculating a third intermediate value based on the first load calculation value and the second load calculation value; calculating a fourth intermediate value based on the first load calculation value and the third load calculation value; determining whether the third intermediate value and the fourth intermediate value are both smaller than the weighing precision error value; if the third intermediate value and the fourth intermediate value are both smaller than the weighing precision error value, determining that the electronic scale is not overloaded; if the third intermediate value and the fourth intermediate value are not both smaller than the weighing precision error value, determining that the electronic scale is overloaded.

[0031] Optionally, the third intermediate value and the fourth intermediate value are calculated by the following formula:

[0032] E3=|a2-b2|, E4=|a2-c2|,

[0033] Wherein, E3 is the third intermediate value, E4 is the fourth intermediate value, a2 is the first load calculation value, b2 is the second load calculation value, and c2 is the third load calculation value.

[0034] The first load calculation value is calculated by the following formula:

[0035] a2=V dif测 -V dif测0 ,

[0036] Among them, V dif0测0 is the first vacancy detection value, V dif测 is the first load detection value, a2 is the first load calculation value,

[0037] The second eccentric load detection value is calculated by the following formula:

[0038] b2=K1×(V 测+ -V 测0+ ),

[0039] Among them, V 测0+ is the second vacancy detection value, V 测+ is the second load detection value, b2 is the second load calculation value, K1 is the first proportional value,

[0040] The third eccentric load detection value is calculated by the following formula:

[0041] c2=K2×(V 测- -V测0- ),

[0042] Among them, V 测0- is the third vacancy detection value, V 测- is the third load detection value, c2 is the third load calculation value, and K2 is the second proportional value.

[0043] The method for identifying overload of an electronic scale provided in the embodiment of the present application can determine whether the electronic scale has overload through the first differential detection point and the second differential detection point formed by the Wheatstone bridge and by detecting the voltage values ​​of the differential detection points under different conditions. This avoids the problem that the current circuit for overload detection is very complicated and costly, and also avoids the problem of collecting data from each independent sensor at the same time and collecting huge amounts of data. This method can accurately and quickly detect the overload of the electronic scale.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A flow chart of a method for identifying an overload of an electronic scale provided in an embodiment of the present application;

[0047] Figure 2 A flowchart for calculating multiple calibration values ​​provided in an embodiment of the present application;

[0048] Figure 3 A flowchart of another method for identifying overload of an electronic scale provided in an embodiment of the present application.

[0049] Figure 4 A circuit diagram of a full-bridge circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0051] First, the application scenarios to which the present application is applicable are introduced. The present application can be applied to the technical field of electronic scale use.

[0052] According to research, with the development of the electronic scale industry, more and more types of electronic scales are becoming familiar and used by people, such as electronic platform scales, electronic floor scales, electronic table scales, and electronic car scales.

[0053] Since current electronic scales use the full-bridge drive principle, it is difficult to implement the overload reminder function when the scale is overloaded. However, when overload occurs, the measured data will deviate from the linear area after sensor calibration, thus affecting the measurement accuracy. Especially when the ground is not very flat, the overload problem will become non-negligible.

[0054] The current load-biasing functions on the market all use data from multiple independent sensors and the least squares method to perform data comparison operations. The circuit is very complex (each sensor needs to have an op amp, ADC, etc. added), the cost is expensive, and the data from each independent sensor needs to be collected at the same time, so the collected data is huge.

[0055] Based on this, an embodiment of the present application provides a method for identifying overload of an electronic scale. Through a first differential detection point and a second differential detection point formed by a Wheatstone bridge, and by detecting the voltage values ​​of the differential detection points under different conditions, it is possible to determine whether the electronic scale is overloaded. This avoids the problem that the current circuit for overload detection is very complex and costly, and also avoids the problem of simultaneously collecting data from each independent sensor and collecting huge amounts of data. This method can accurately and quickly detect the overload of an electronic scale.

[0056] See also Figure 1 , Figure 1 This is a flow chart of a method for identifying an overload of an electronic scale provided in an embodiment of the present application. Figure 1 As shown in , the method for identifying an overload of an electronic scale provided in an embodiment of the present application includes:

[0057] S101. When the electronic scale is idle, obtain a first vacancy detection value, a second vacancy detection value, and a third vacancy detection value of the electronic scale that are stable within a same time period.

[0058] Among them, the first vacancy detection value is the voltage value when the electronic scale is idle, the second vacancy detection value is the voltage value of the first differential detection point when the left half bridge is grounded when the electronic scale is idle, and the third vacancy detection value is the voltage value of the second differential detection point when the right half bridge is grounded when the electronic scale is idle.

[0059] Specifically, the full-bridge circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first MOS transistor, and a second MOS transistor.

[0060] Among them, one end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the other end of the first resistor, and a voltage input point is formed between the other end of the eighth resistor and the other end of the first resistor, and the voltage input point is connected to an external A power supply is connected, a first differential detection point S- is formed between the other end of the second resistor and one end of the third resistor, a grounding point is formed between the other end of the fourth resistor and one end of the fifth resistor, the grounding point is grounded, a second differential detection point S+ is formed between the other end of the sixth resistor and one end of the seventh resistor, the D pole of the first MOS tube is connected to the second differential detection point, the S pole of the first MOS tube is grounded, the G pole of the first MOS tube is connected to the first control end, the D pole of the second MOS tube is connected to the first differential detection point, the S pole of the second MOS tube is grounded, and the G pole of the second MOS tube is connected to the second control end.

[0061] Wherein, the full-bridge circuit further includes a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor.

[0062] Among them, one end of the ninth resistor is connected to the G pole of the first MOS tube, the other end of the ninth resistor is connected to the first control end, one end of the tenth resistor is connected to the G pole of the first MOS tube, the other end of the tenth resistor is grounded, one end of the eleventh resistor is connected to the G pole of the second MOS tube, the other end of the eleventh resistor is connected to the second control end, one end of the twelfth resistor is connected to the G pole of the second MOS tube, and the other end of the twelfth resistor is grounded.

[0063] For example, see Figure 4 , Figure 4 This is a circuit diagram of a full-bridge circuit provided in an embodiment of the present application. Figure 4 As shown in, the full-bridge circuit includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first MOS tube Q1, a second MOS tube Q2, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a first input buffer IB1, a second input buffer IB2, an amplifier PGIA, an analog-to-digital conversion calculator ADC, a first control terminal CTR1, and a second control terminal CTR2.

[0064] Among them, one end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the other end of the first resistor, and a voltage input point is formed between the other end of the eighth resistor and the other end of the first resistor, and the voltage input point is connected to an external A power supply is connected, a first differential detection point S- is formed between the other end of the second resistor and one end of the third resistor, a grounding point is formed between the other end of the fourth resistor and one end of the fifth resistor, the grounding point is grounded, a second differential detection point S+ is formed between the other end of the sixth resistor and one end of the seventh resistor, the D pole of the first MOS tube is connected to the second differential detection point, the S pole of the first MOS tube is grounded, the G pole of the first MOS tube is connected to the first control end, the D pole of the second MOS tube is connected to the first differential detection point, the S pole of the second MOS tube is grounded, and the G pole of the second MOS tube is connected to the second control end.

[0065] Among them, one end of the ninth resistor is connected to the G pole of the first MOS tube, the other end of the ninth resistor is connected to the first control end, one end of the tenth resistor is connected to the G pole of the first MOS tube, the other end of the tenth resistor is grounded, one end of the eleventh resistor is connected to the G pole of the second MOS tube, the other end of the eleventh resistor is connected to the second control end, one end of the twelfth resistor is connected to the G pole of the second MOS tube, and the other end of the twelfth resistor is grounded.

[0066] Among them, the input end of the first input buffer is connected to the first differential detection point S-, the output end of the first input buffer is connected to the first input end of the amplifier, the input end of the second input buffer is connected to the second differential detection point S+, the output end of the second input buffer is connected to the second input end of the amplifier, and the first input end and the second input end of the amplifier are both connected to the analog-to-digital conversion calculator, so that the analog-to-digital conversion calculator can work according to the electronic scale overload identification method proposed in this application.

[0067] The first MOS transistor and the second MOS transistor may be NMOS transistors.

[0068] Here, the first control terminal CTR1 and the second control terminal CTR2 are used to control the on and off of the first MOS transistor and the left and right half bridges to be grounded, so as to detect the second vacancy detection value and the third vacancy detection value.

[0069] The multiple calibration values ​​include a sensor accuracy error value, a weighing accuracy error value, a first ratio value and a second ratio value.

[0070] Specifically, the sensor accuracy error value can be determined by the following steps: determining the sensor accuracy error value according to the repeatability error, structural limit error, and analog-to-digital converter error of multiple sensors in the electronic scale,

[0071] Specifically, the weighing precision error value may be determined by the following steps: determining the weighing precision error value according to the precision requirement of the electronic scale.

[0072] As an example, the first proportion value and the second proportion value can be determined by the following steps: when the electronic scale leaves the factory and is idle, the first calibration voltage value of the full-bridge circuit is obtained; when the electronic scale leaves the factory and is idle, the first differential detection point and the second differential detection point are grounded, and the second calibration voltage value and the third calibration voltage value of the full-bridge circuit are obtained; when the electronic scale leaves the factory and a target load is placed on it, the fourth calibration voltage value of the full-bridge circuit is obtained; when the electronic scale leaves the factory and a target load is placed on it, the first differential detection point and the second differential detection point are grounded, and the fifth calibration voltage value and the sixth calibration voltage value of the full-bridge circuit are obtained; the first proportion value is determined according to the first calibration voltage value, the fourth calibration voltage value, the second calibration voltage value and the fifth calibration voltage value; the second proportion value is determined according to the first calibration voltage value, the fourth calibration voltage value, the third calibration voltage value and the sixth calibration voltage value.

[0073] Specifically, the first ratio value may be determined by the following formula:

[0074]

[0075] Among them, K1 is the first proportional value, V dif1 is the fourth calibration voltage value, V dif0 is the first calibration voltage value, V 1+ is the fifth calibration voltage value, V 0+ is the second calibration voltage value.

[0076] Specifically, the second ratio value may be determined by the following formula:

[0077]

[0078] Among them, K2 is the second ratio value, V dif1 is the fourth calibration voltage value, V dif0 is the first calibration voltage value, V 1- is the sixth calibration voltage value, V 0- is the third calibration voltage value.

[0079] As an example, the target load may be 30 kg, 50 kg, 70 kg, etc.

[0080] As an example, see Figure 2 , Figure 2 The flowchart of calculating multiple calibration values ​​provided in the embodiment of the present application. Figure 2 As shown in , the steps of calculating multiple calibration values ​​provided in the embodiment of the present application include:

[0081] S201, respectively obtain the differential voltage value of each point of the full bridge.

[0082] S202, the left half bridge is grounded, and the voltage value of each point of the right half bridge is obtained.

[0083] S203 , the right half bridge is grounded, and the voltage value of each point of the left half bridge is obtained.

[0084] S204: Calculate a first ratio value and a second ratio value.

[0085] S205, writing the first ratio value, the second ratio value, the sensor accuracy error value, and the weighing accuracy error value into the electronic scale storage.

[0086] S102: Determine whether the electronic scale is placed horizontally according to the measured and set multiple calibration values, the first vacancy detection value, the second vacancy detection value and the third vacancy detection value.

[0087] Specifically, whether the electronic scale is placed horizontally can be determined by the following steps: determine a first horizontal calculation value based on a first vacancy detection value and a first calibration voltage value; determine a second horizontal calculation value based on a second vacancy detection value, a second calibration voltage value and a first ratio value; determine a third horizontal calculation value based on a third vacancy detection value, a third calibration voltage value and a second ratio value; calculate a first offset load value and a second offset load value based on the first horizontal calculation value, the second horizontal calculation value and the third horizontal calculation value; determine whether the first offset load value and the second offset load value are both smaller than the sensor accuracy error value; if the first offset load value and the second offset load value are both smaller than the sensor accuracy error value, determine that the electronic scale is placed horizontally; if an intermediate value and the second offset load value are not both smaller than the sensor accuracy error value, determine that the electronic scale is not placed horizontally.

[0088] Specifically, the first eccentric load value and the second eccentric load value may be calculated by the following formulas: E1 = |a1-b1|, E2 = |a1-c1|.

[0089] Among them, E1 is the first eccentric load value, E2 is the second eccentric load value, a1 is the first horizontal calculation value, b1 is the second horizontal calculation value, and c1 is the third horizontal calculation value.

[0090] Specifically, the first level calculation value can be calculated by the following formula:

[0091] a1=V dif0测0 -V dif0 ,

[0092] Among them, V dif0测0 is the first vacancy detection value, V dif0 is the first calibration voltage value, and a1 is the first level calculation value.

[0093] Specifically, the second level calculation value can be calculated by the following formula:

[0094] b1=K1×(V 测0+-V 0+ )

[0095] Among them, V 测0+ is the second vacancy detection value, V 0+ is the second calibration voltage value, b1 is the second level calculation value, and K1 is the first proportional value.

[0096] Specifically, the third level calculation value can be calculated by the following formula:

[0097] c1=K2×(V 测0- -V 0- ),

[0098] Among them, V 测0- is the third vacancy detection value, V 0- is the third calibration voltage value, c1 is the third level calculation value, and K2 is the second proportional value.

[0099] S103: If the electronic scale is placed horizontally, obtain a first load detection value, a second load detection value, and a third load detection value that are stable within the same time period of the electronic scale.

[0100] Among them, the first load detection value is the voltage value when the target load is placed on the electronic scale, the second load detection value is the voltage value of the first differential detection point when the left half bridge is grounded when the target load is placed on the electronic scale, and the third load detection value is the voltage value of the second differential detection point when the right half bridge is grounded when the target load is placed on the electronic scale.

[0101] S104, determining whether the electronic scale is overloaded according to the measured and set multiple calibration values, the first empty detection value, the second empty detection value and the third empty detection value, the first load detection value, the second load detection value and the third load detection value.

[0102] Specifically, whether the electronic scale is overloaded can be determined through the following steps: determine the first load calculation value according to the first load detection value and the first empty detection value; determine the second load calculation value according to the second load detection value, the second empty detection value and the first ratio value; determine the third load calculation value according to the third load detection value, the third empty detection value and the second ratio value; calculate the third intermediate value according to the first load calculation value and the second load calculation value; calculate the fourth intermediate value according to the first load calculation value and the third load calculation value; determine whether the third intermediate value and the fourth intermediate value are both smaller than the weighing precision error value; if the third intermediate value and the fourth intermediate value are both smaller than the weighing precision error value, determine that the electronic scale is not overloaded; if the third intermediate value and the fourth intermediate value are not both smaller than the weighing precision error value, determine that the electronic scale is overloaded.

[0103] Specifically, the third intermediate value and the fourth intermediate value can be calculated by the following formula:

[0104] E3=|a2-b2|, E4=|a2-c2|,

[0105] Among them, E3 is the third intermediate value, E4 is the fourth intermediate value, a2 is the first load calculation value, b2 is the second load calculation value, and c2 is the third load calculation value.

[0106] Specifically, the first load calculation value can be calculated by the following formula:

[0107] a2=V dif测 -V dif测0 ,

[0108] Among them, V dif0测0 is the first vacancy detection value, V dif测 is the first load detection value, and a2 is the first load calculation value.

[0109] Specifically, the second eccentric load detection value can be calculated by the following formula:

[0110] b2=K1×(V 测+ -V 测0+ ),

[0111] Among them, V 测0+ is the second vacancy detection value, V 测+ is the second load detection value, b2 is the second load calculation value, and K1 is the first proportional value.

[0112] Specifically, the third eccentric load detection value can be calculated by the following formula:

[0113] c2=K2×(V 测- -V 测0- ),

[0114] Among them, V 测0- is the third vacancy detection value, V 测- is the third load detection value, c2 is the third load calculation value, and K2 is the second proportional value.

[0115] As an example, see Figure 3 , Figure 3 A flowchart of another method for identifying overload of an electronic scale provided in an embodiment of the present application.

[0116] First, step S301 is executed to obtain a first vacancy detection value, a second vacancy detection value, and a third vacancy detection value of the electronic scale when the electronic scale is vacant.

[0117] Afterwards, step S302 is executed to determine whether the electronic scale is placed horizontally according to the measured and set multiple calibration values, the first vacancy detection value, the second vacancy detection value and the third vacancy detection value.

[0118] If the electronic scale is not placed horizontally, step S306 is executed to prompt the user to place the electronic scale horizontally. After step S306 is completed, step S301 is executed again.

[0119] If the electronic scale is placed horizontally, step S303 is executed to obtain a first load detection value, a second load detection value and a third load detection value of the electronic scale.

[0120] Then, step S304 is executed to determine whether the electronic scale is overloaded according to the measured and set multiple calibration values, the first empty detection value, the second empty detection value and the third empty detection value, the first load detection value, the second load detection value and the third load detection value.

[0121] If the electronic scale is overloaded, step S307 is executed to prompt the user to measure in the center. After completing S307, step S301 is executed again.

[0122] If the electronic scale is not overloaded, step S305 is executed to display the measurement result.

[0123] The method for identifying overload of an electronic scale provided in the embodiment of the present application can determine whether the electronic scale has overload through the first differential detection point and the second differential detection point formed by the Wheatstone bridge and by detecting the voltage values ​​of the differential detection points under different conditions. This avoids the problem that the current circuit for overload detection is very complicated and costly, and also avoids the problem of collecting data from each independent sensor at the same time and collecting huge amounts of data. This method can accurately and quickly detect the overload of the electronic scale.

[0124] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0127] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0128] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for identifying eccentric loading of an electronic scale, characterized in that: The electronic scale includes a full-bridge circuit, the full-bridge circuit includes a Wheatstone bridge, the Wheatstone bridge is formed with a first differential detection point and a second differential detection point, Wherein, the method comprises: When the electronic scale is idle, a first vacancy detection value, a second vacancy detection value and a third vacancy detection value that are stable in the same time period of the electronic scale are obtained, wherein the first vacancy detection value is a voltage value when the electronic scale is idle, the second vacancy detection value is a voltage value of a first differential detection point when the left half bridge is grounded when the electronic scale is idle, and the third vacancy detection value is a voltage value of a second differential detection point when the right half bridge is grounded when the electronic scale is idle; Determining whether the electronic scale is placed horizontally according to the measured and set multiple calibration values, the first vacancy detection value, the second vacancy detection value and the third vacancy detection value; If the electronic scale is placed horizontally, a first load detection value, a second load detection value and a third load detection value that are stable within the same time period of the electronic scale are obtained, wherein the first load detection value is a voltage value when a target load is placed on the electronic scale, the second load detection value is a voltage value of a first differential detection point when the left half bridge is grounded when the target load is placed on the electronic scale, and the third load detection value is a voltage value of a second differential detection point when the right half bridge is grounded when the target load is placed on the electronic scale; Whether the electronic scale is overloaded is determined based on the measured and set multiple calibration values, the first empty detection value, the second empty detection value and the third empty detection value, the first load detection value, the second load detection value and the third load detection value.

2. The method according to claim 1, characterized in that The full-bridge circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first MOS transistor, and a second MOS transistor. Among them, one end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the other end of the first resistor, and a voltage input point is formed between the other end of the eighth resistor and the other end of the first resistor, and the voltage input point is connected to An external power supply is connected, a first differential detection point is formed between the other end of the second resistor and one end of the third resistor, a grounding point is formed between the other end of the fourth resistor and one end of the fifth resistor, the grounding point is grounded, a second differential detection point is formed between the other end of the sixth resistor and one end of the seventh resistor, the D pole of the first MOS tube is connected to the second differential detection point, the S pole of the first MOS tube is grounded, the G pole of the first MOS tube is connected to the first control end, the D pole of the second MOS tube is connected to the first differential detection point, the S pole of the second MOS tube is grounded, and the G pole of the second MOS tube is connected to the second control end.

3. The method according to claim 2, characterized in that The full-bridge circuit further includes a ninth resistor, a tenth resistor, an eleventh resistor and a twelfth resistor, Among them, one end of the ninth resistor is connected to the G pole of the first MOS tube, the other end of the ninth resistor is connected to the first control end, one end of the tenth resistor is connected to the G pole of the first MOS tube, the other end of the tenth resistor is grounded, one end of the eleventh resistor is connected to the G pole of the second MOS tube, the other end of the eleventh resistor is connected to the second control end, one end of the twelfth resistor is connected to the G pole of the second MOS tube, and the other end of the twelfth resistor is grounded.

4. The method according to claim 1, characterized in that: The multiple calibration values ​​include a sensor accuracy error value, a weighing accuracy error value, a first ratio value, and a second ratio value. The sensor accuracy error value is determined by the following steps: Determine the sensor accuracy error value according to the repeatability error, structural limit error, and analog-to-digital converter error of multiple sensors in the electronic scale, The weighing accuracy error value is determined by the following steps: The weighing accuracy error value is determined according to the accuracy requirement of the electronic scale.

5. The method according to claim 2, characterized in that: The first ratio value and the second ratio value are determined by the following steps: When the electronic scale leaves the factory and is idle, obtaining a first calibration voltage value of the full-bridge circuit; When the electronic scale leaves the factory and is idle, the first differential detection point and the second differential detection point are grounded, and the second calibration voltage value and the third calibration voltage value of the full-bridge circuit are obtained; When the electronic scale leaves the factory and is loaded with a target load, obtaining a fourth calibration voltage value of the full-bridge circuit; When the electronic scale leaves the factory and is placed with a target load, the first differential detection point and the second differential detection point are grounded, and the fifth calibration voltage value and the sixth calibration voltage value of the full-bridge circuit are grounded; determining the first ratio value according to the first calibration voltage value, the fourth calibration voltage value, the second calibration voltage value and the fifth calibration voltage value; The second ratio value is determined according to the first calibration voltage value, the fourth calibration voltage value, the third calibration voltage value and the sixth calibration voltage value.

6. The method according to claim 5, characterized in that The first ratio value is determined by the following formula: Among them, K1 is the first proportional value, V dif1 is the fourth calibration voltage value, V dif0 is the first calibration voltage value, V 1+ is the fifth calibration voltage value, V 0+ is the second calibration voltage value, The second ratio value is determined by the following formula: Among them, K2 is the second ratio value, V dif1 is the fourth calibration voltage value, V dif0 is the first calibration voltage value, V 1- is the sixth calibration voltage value, V 0- is the third calibration voltage value.

7. The method according to claim 5, characterized in that Determine whether the electronic scale is level by following these steps: determining a first level calculation value based on the first vacancy detection value and the first calibration voltage value; determining a second level calculation value according to the second vacancy detection value, the second calibration voltage value, and the first ratio value; determining a third level calculation value according to the third vacancy detection value, the third calibration voltage value, and the second ratio value; Calculating a first eccentric load value and a second eccentric load value according to the first level calculation value, the second level calculation value, and the third level calculation value; Determine whether the first eccentric load value and the second eccentric load value are both less than the sensor accuracy error value; If the first eccentric load value and the second eccentric load value are both smaller than the sensor accuracy error value, it is determined that the electronic scale is placed horizontally; If the first eccentric load value and the second eccentric load value are both smaller than the sensor accuracy error value, it is determined that the electronic scale is not placed horizontally.

8. The method according to claim 7, characterized in that The first eccentric load value and the second eccentric load value are calculated by the following formula: E1=|a1-b1|, E2=|a1-c1|, Wherein, E1 is the first eccentric load value, E2 is the second eccentric load value, a1 is the first level calculation value, b1 is the second level calculation value, c1 is the third level calculation value, The first level calculation value is calculated by the following formula: a1=V dif0测0 -V dif0 , Among them, V dif0测0 is the first vacancy detection value, V dif0 is the first calibration voltage value, a1 is the first level calculation value, The second level calculation value is calculated by the following formula: b1=K1×(V 测0+ -V 0+ ) Among them, V 测0+ is the second vacancy detection value, V 0+ is the second calibration voltage value, b1 is the second level calculation value, K1 is the first ratio value, The third level calculation value is calculated by the following formula: c1=K2×(V 测0- -V 0- ), Among them, V 测0- is the third vacancy detection value, V 0- is the third calibration voltage value, c1 is the third level calculation value, and K2 is the second proportional value.

9. The method according to claim 5, characterized in that Determine whether the electronic scale is overloaded by following the steps below: Determine a first load calculation value according to the first load detection value and the first empty detection value; Determine a second load calculation value according to the second load detection value, the second vacancy detection value and the first ratio value; Determine a third load calculation value according to the third load detection value, the third vacancy detection value, and the second ratio value; Calculating a third intermediate value according to the first load calculation value and the second load calculation value; Calculating a fourth intermediate value according to the first load calculation value and the third load calculation value; Determine whether the third intermediate value and the fourth intermediate value are both less than the weighing precision error value; If the third intermediate value and the fourth intermediate value are both smaller than the weighing precision error value, it is determined that the electronic scale is not overloaded; If the third intermediate value and the fourth intermediate value are both smaller than the weighing precision error value, it is determined that the electronic scale is overloaded.

10. The method according to claim 9, characterized in that The third median and fourth median values ​​are calculated by the following formula: E3=|a2-b2|, E4=|a2-c2|, Wherein, E3 is the third intermediate value, E4 is the fourth intermediate value, a2 is the first load calculation value, b2 is the second load calculation value, and c2 is the third load calculation value. The first load calculation value is calculated by the following formula: a2=V dif测 -V dif测0 , Among them, V dif0测0 is the first vacancy detection value, V dif测 is the first load detection value, a2 is the first load calculation value, The second eccentric load detection value is calculated by the following formula: b2=K1×(V 测+ -V 测0+ ), Among them, V 测0+ is the second vacancy detection value, V 测+ is the second load detection value, b2 is the second load calculation value, K1 is the first proportional value, The third eccentric load detection value is calculated by the following formula: c2=K2×(V 测- -V 测0- ), Among them, V 测0- is the third vacancy detection value, V 测- is the third load detection value, c2 is the third load calculation value, and K2 is the second proportional value.

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