CN102778287B - System and method for controlling tiltable weighing electronic scale - Google Patents

System and method for controlling tiltable weighing electronic scale Download PDF

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Publication number
CN102778287B
CN102778287B CN201210265080.4A CN201210265080A CN102778287B CN 102778287 B CN102778287 B CN 102778287B CN 201210265080 A CN201210265080 A CN 201210265080A CN 102778287 B CN102778287 B CN 102778287B
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China
Prior art keywords
weighing
scale
angle
axis
level
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CN201210265080.4A
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Chinese (zh)
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CN102778287A (en
Inventor
张天袖
李先勇
陈月忠
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中山佳维电子有限公司
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Publication of CN102778287A publication Critical patent/CN102778287A/en
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Abstract

The invention discloses a system and method for controlling a tiltable weighing electronic scale. The system comprises a scale body, wherein the scale body is provided with a display and a weighing face; a weighing sensor and an angle detection device are arranged in the scale body, the weighing sensor is used for measuring pressure, and the angle detection device is used for detecting the degree of tilting of the weighing face of the scale body; a weighing module processor which is used for calculating the actual weight of an object according to data measured by the angle detection device and the weighing sensor is further arranged in the scale body; and the display, the weighing sensor and the angle detection device are respectively connected with the weighing module processor. The system and the method have the aim that a pressure sensing value read from the weighing sensor is compensated according to that an included angle formed by the weighing face of the scale body and a horizontal plane is equal to that formed by a pressure to the weighing face and the gravity of the object, so that a current display value of the electronic scale is close to the actual weight of the object, and the error of measurement on the actual weight of the object caused due to the existence of a tilt angle can not be generated.

Description

A kind of control system of tiltable weighing electronic scale and control method
[technical field]
The present invention relates to a kind of control system and control method of tiltable weighing electronic scale.
[background technology]
At present weighing apparatus product on the market all must be placed on smooth table top or keep horizontality just can accurate weighing, which greatly limits the environment of weighing apparatus product use.Again because user is difficult to judge weighing apparatus product whether level, so the weighing of a lot of product can be caused to be affected.The method adjusting Product Level is in the market all adopt level meter mostly, although method is feasible, adjustment process is cumbersome, and when having changed a position, must must readjust, for this reason, being necessary to overcome the above problems.
[summary of the invention]
Instant invention overcomes the deficiency of above-mentioned technology, provide a kind of control system and control method of tiltable weighing electronic scale, face of the weighing degree of tilt with respect to the horizontal plane of scale body is detected by inclination angle detection module, and LOAD CELLS sense object is applied to the pressure in the face of weighing, controller compensates pressure sensitive value according to force analysis principle, make Current electronic weighing apparatus displayed value close to actual object gravimetric value, and the measuring error to object actual weight can not be caused due to the existence at pitch angle.
For achieving the above object, present invention employs following technical proposal:
A kind of control system of tiltable weighing electronic scale, include scale body 1, described scale body 1 is provided with display 2 and face 101 of weighing, the LOAD CELLS 3 being applied to the face of weighing 101 pressure for measuring object is provided with in described scale body 1, for measuring the angle detection device 4 of the face of weighing 101 degree of tilt, and the degree of tilt data first detected by angle detection device 4 calculate the face of weighing 101 and angle formed by surface level 102, then the pressure sensitive value of force analysis principle to LOAD CELLS 3 equaling angle formed by LOAD CELLS 3 pressure direction and object gravity direction according to weigh face 101 and angle formed by surface level 102 compensates the module processor 5 of weighing calculating object actual weight, described display 2, LOAD CELLS 3, angle detection device 4 is connected with module processor 5 of weighing respectively.
As optimization, described angle detection device 4 adopts the 3-axis acceleration sensor exporting the component value data of acceleration of gravity on triaxial coordinate for detecting degree of tilt, and described 3-axis acceleration sensor output terminal is connected with module processor 5 of weighing.
As optimization, described angle detection device 4 adopts model to be the triaxial accelerometer acceleration transducer of LIS35DE.
As optimization, described angle detection device 4 adopts for detecting degree of tilt and the direct obliquity sensor exporting inclination value data.
The present invention can be used on spoon scale, also can be used on measuring cup scale and luggage scale.
A control method for tiltable weighing electronic scale, includes following steps:
On object, scale is weighed, and LOAD CELLS 3 inspected object is applied to the pressure that scale body is weighed on face 101, and pressure sensitive value N is exported to module processor 5 of weighing;
Angle detection device 4 is measured scale body and to be weighed the degree of tilt in face, exports degree of tilt data and calculates inclination value α to module processor 5 of weighing;
According to force analysis, the face of weighing 101 of scale body equals angle formed by LOAD CELLS 3 pressure N direction and object gravity G direction with angle α formed by surface level, namely has module processor 5 of weighing calculates object actual weight, and result of calculation is exported to display 2 shows.
The invention has the beneficial effects as follows: 1, can be widely used in weighing apparatus product, as on spoon scale, use procedure does not just need adjustment level, avoids the weighing problem that the inclination because of scale body brings; 2, be applied on electronic measuring cup weigher, user can measure on the limit of falling thing, limit, facilitates easy-to-use.3, be applied on commercial electronic-weighing system, user no longer needs the level repeatedly being adjusted scale body by level meter.
[accompanying drawing explanation]
Fig. 1 is schematic diagram in kind of the present invention.
Fig. 2 is structural representation of the present invention.
Fig. 3 is the principle schematic that the present invention tilts to weigh.
Fig. 4 is the schematic diagram of the embodiment of the present invention 1.
Fig. 5 is the schematic diagram that tetrahedron asks angle.
Fig. 6 is process flow diagram of weighing of the present invention.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention:
As shown in Figure 1-2, a kind of control system of tiltable weighing electronic scale, it is characterized in that including scale body 1, described scale body 1 is provided with display 2 and face 101 of weighing, the LOAD CELLS 3 being applied to the face of weighing 101 pressure for measuring object is provided with in described scale body 1, for measuring the angle detection device 4 of the face of weighing 101 degree of tilt, and the degree of tilt data first detected by angle detection device 4 calculate the face of weighing 101 and angle formed by surface level 102, then the pressure sensitive value of force analysis principle to LOAD CELLS 3 equaling angle formed by LOAD CELLS 3 pressure direction and object gravity direction according to weigh face 101 and angle formed by surface level 102 compensates the module processor 5 of weighing calculating object actual weight, described display 2, LOAD CELLS 3, angle detection device 4 is connected with module processor 5 of weighing respectively.
As shown in Figure 3, the degree of tilt of detection scale body 1 of the present invention also refers to the degree of tilt in the face of weighing 101 detected on scale body 1, namely weigh face 101 and angle α formed by surface level 102, according to force analysis, the face of weighing 101 of scale body equals angle formed by LOAD CELLS 3 pressure N direction and object gravity G direction with inclination angle formed by surface level 102, show that inclination is weighed compensation relationship:
G = N COSα
Wherein G is weight of object, and N is the pressure sensitive value that LOAD CELLS 3 reads, and α is also designated as inclination value, goes out object actual weight according to above-mentioned formulae discovery, and therefore, as long as solve, how to calculate inclination value by the output signal of angle detection device 4 just passable.
Embodiment 1, angle detection device 4 adopts 3-axis acceleration sensor, 3-axis acceleration sensor is the device of a kind of measurement three directional accelerations, it can measure the accekeration of each axle, then changed by the voltage signal that exports or digital signal and inclination value, infer the relation of the 3-axis acceleration value that 3-axis acceleration sensor exports and inclination value below.
As shown in Figure 4, if the angle of X-axis and surface level is angle of pitch Ax, the angle of Y-axis and surface level is roll angle Ay.Below for angle of pitch Ax, carry out the derivation of computing formula.When acceleration transducer horizontal positioned in the horizontal plane time, its original state coordinate overlaps with X-axis, Y-axis, Z axis, and now Ax is 0 degree, the static acceleration value on each axle: ADx=0g, ADy=0g, ADz=lg; When X-axis and surface level produce angle of pitch Ax, i.e. angle P as shown in the figure, projects to XZ axial plane by coordinate system, the static acceleration value on each axle can be tried to achieve: ADx=-lg × sin (Ax), ADy=0g, ADz=lg × cos (Ax), draws the angle of pitch in like manner draw roll angle and ADx, ADy, ADz are read by 3-axis acceleration sensor, module processor 5 of namely weighing calculates the inclination angle of system in each coordinate axis by the output signal of connected 3-axis acceleration sensor.
As shown in Figure 5, angle is asked to have according to tetrahedron by negating, cosine can draw bevel angle value α, and the degree of tilt of weighing due to practical application medium dip is limited, can not weigh when degree of tilt is excessive, describedly actually bevel angle value α can be approximately α=Ax+Ay and facilitate system operations.
Embodiment 2, angle detection device 4 adopts model to be the triaxial accelerometer acceleration transducer of LIS35DE, LIS35DE 3-axis acceleration sensor is a kind of high precision, low-power consumption and practical IC chip three axle acceleration sensor, and inner integrating control chip exports accekeration digital signal.As shown in Figure 4, LIS35DE tri-axle acceleration sensor measures the dimensional orientation of object using gravitational vector as benchmark, carry out gradient measurement, when the inductive axis of accelerometer i.e. inductive axis level vertical with gravity direction, it is the most responsive to the change of degree of tilt, now inductive axis X is vertical with gravity direction with Y-axis, its digital quantity exported in X and Y-axis and degree of tilt keep linear, and when inductive axis and gravity direction are close to time parallel, the close+lg or-1g of acceleration output valve that the Z axis of LIS35DE tri-axle acceleration sensor senses.Will speed up X and Y-axis all horizontal positioned of meter, now X-axis and Y-axis export acceleration of gravity is 0, just can as bi-axial tilt measurement amount degree of tilt, will measure output digit signals ADx, ADy and be converted into the g value variable quantity G of correspondence x, G y, LIS35DE is had:
G X=(AD X×1g/64)
G Y=(AD Y×1g/64)
The internal conversion relation of above-mentioned formula reaction LIS35DE output signal value and accekeration, substitutes into pitch angle Ax and Ay that formulae discovery below obtains X, Y-axis,
Ax=G X×90/lg≈1.4ADx
A y=G Y×90/1g≈1.4ADy
Above-mentioned formula is the internal conversion relation at the acceleration that calculates of LIS35DE and pitch angle, wherein, tilt data ADx, ADy, ADz are directly exported by LIS35DE, and the pitch angle calculated according to α=Ax+Ay and LIS35DE export the proportional relation of accekeration, providing means more easily for other model angle detection devices 4 pairs of pressure measuring values carry out slope compensation, also providing reference for using during the 3-axis acceleration sensor of other models.
Embodiment 3, angle detection device 4 directly adopts existing finished product module obliquity sensor on the market.Obliquity sensor is a kind of device of the horizontal survey for system, its micro-control unit, micro electro mechanical system accelerator, analog to digital conversion circuit, communication unit are all integrated on the circuit board of a piece very little, the tilt data such as direct output inclination value α, angle detection device 4 is all in the module integrated the computation process of inclination value, decrease the operand of module processor 5 of weighing, module processor 5 of weighing directly utilizes output signal and basis just can calculate object actual weight.
As shown in Figure 6, on object, scale is weighed, and LOAD CELLS 3 inspected object is applied to the pressure that scale body is weighed on face 101, and pressure sensitive value N is exported to module processor 5 of weighing; Angle detection device 4 is measured scale body and to be weighed the degree of tilt in face, exports degree of tilt data and calculates inclination value α to module processor 5 of weighing; Module processor 5 of weighing calculates object actual weight, and result of calculation is exported to display 2 shows.
The present invention measures inclination angle and carries out the method for slope compensation a lot, the process means that the tilt data detected by angle detection device 4 calculates inclination value α have a variety of, those skilled in the art can according to the concrete output signal of angle detection device 4 and the mathematical relation of inclination value α, selecting a kind of approximate transform formula being convenient to computing to be solidificated in advance weighs in module processor 5, thus calculate inclination value α, it does not affect the effect of basic structure of the present invention and realization, as long as have employed pick-up unit to carry out tilt data detection to scale body, and carry out compensation to measuring error when tilting to weigh or correction by the measured value of these data relevant with inclination value α and LOAD CELLS 3, thus calculate the mode of object actual weight, it is all protection scope of the present invention.
The technology of the present invention can be widely applied on weighing apparatus product, particularly spoon scale.The service condition of spoon scale is: the hand-held spoon scale of user is weighed, if the face of weighing of spoon scale is out-of-level, just cannot ensure to weigh accurately, if adjust level by level meter, to use and quite inconvenient, if apply our this inclination weighing technology, carrying out horizontal adjustment with regard to not needing, bringing revolutionary leap to the ease of use of spoon scale and weighing accuracy.
Can also be used in addition on measuring cup scale, the use habit of measuring cup scale is: the limit of falling thing, limit is measured.Measure process be also be difficult to ensure Product Level, if fallen thing again product pendulum measure on table top and suitable trouble.If apply this inclination measurement technology, bring qualitative leap also can to the ease of use of measuring cup scale.
Technical scheme of the present invention also can be applied on other weighing apparatus products such as luggage scale, avoids the weighing problem that the injustice due to weighing table is brought, and use procedure does not just need repeatedly to adjust level.

Claims (4)

1. the control system of a tiltable weighing electronic scale, it is characterized in that including scale body (1), described scale body (1) is provided with display (2) and face of weighing (101), the LOAD CELLS (3) being applied to the face of weighing (101) pressure for measuring object is provided with in described scale body (1), for measuring the angle detection device (4) of face (101) degree of tilt of weighing, and the degree of tilt data first detected by angle detection device (4) calculate the face of weighing (101) angle formed with surface level (102), then the pressure sensitive value of force analysis principle to LOAD CELLS (3) equaling angle formed by LOAD CELLS (3) pressure direction and object gravity direction according to the formed angle of weigh face (101) and surface level (102) compensates the module processor (5) of weighing calculating object actual weight, described display (2), LOAD CELLS (3), angle detection device (4) is connected with module processor (5) of weighing respectively, described angle detection device (4) adopts the 3-axis acceleration sensor exporting the component value data of acceleration of gravity on triaxial coordinate for detecting degree of tilt, described 3-axis acceleration sensor output terminal is connected with module processor (5) of weighing, described angle detection device (4) employing model is the triaxial accelerometer acceleration transducer of LIS35DE, in 3-axis acceleration sensor, the angle of X-axis and surface level is the angle of angle of pitch Ax and Y-axis and surface level is roll angle Ay, inclination value α is the formed angle of the face of weighing (101) and surface level (102), 3-axis acceleration sensor is in X-axis, the component of acceleration ADx of Y-axis, ADy directly reads, 3-axis acceleration sensor is at X, pitch angle note Ax and Ay of Y-axis, there is Ax ≈ 1.4ADx and A y≈ 1.4ADy, has inclination value α=Ax+Ay=1.4ADx+1.4ADy, and it is N that LOAD CELLS (3) detects that object is applied to the scale body pressure of weighing on face (101), so, and module processor (5) basis of weighing calculate object actual weight G.
2. the control system of a kind of tiltable weighing electronic scale according to claim 1, is characterized in that described scale body (1) is spoon scale.
3. the control system of a kind of tiltable weighing electronic scale according to claim 1, is characterized in that described scale body (1) is measuring cup scale.
4. the control system of a kind of tiltable weighing electronic scale according to claim 1, is characterized in that described scale body (1) is luggage scale.
CN201210265080.4A 2012-07-27 2012-07-27 System and method for controlling tiltable weighing electronic scale CN102778287B (en)

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