CN111473844B - Piezoelectric sensor based on vehicle dynamic weight measuring array - Google Patents
Piezoelectric sensor based on vehicle dynamic weight measuring array Download PDFInfo
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- CN111473844B CN111473844B CN202010585688.XA CN202010585688A CN111473844B CN 111473844 B CN111473844 B CN 111473844B CN 202010585688 A CN202010585688 A CN 202010585688A CN 111473844 B CN111473844 B CN 111473844B
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- 238000005303 weighing Methods 0.000 claims abstract description 41
- 238000005259 measurement Methods 0.000 claims abstract description 34
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 238000009825 accumulation Methods 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 101150054854 POU1F1 gene Proteins 0.000 description 11
- 239000000463 material Substances 0.000 description 3
- 230000003019 stabilising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/13—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing having piezoelectric or piezoresistive properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/03—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion
- G01G19/035—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing during motion using electrical weight-sensitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
- G01G21/10—Floating suspensions; Arrangements of shock absorbers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
Abstract
The invention discloses a piezoelectric sensor based on a vehicle dynamic weight measuring array, which comprises: the weighing device comprises a weighing unit, a sensing unit and a remote control unit; the sensing unit comprises a first piezoelectric sensor group, a second piezoelectric sensor group and a transverse pressure sensor group; the weighing unit comprises a foundation pit and a weighing plate; the bottoms of the first piezoelectric sensor group and the second piezoelectric sensor group are fixedly connected with the top of the stabilizing plate, and the transverse pressure sensor group comprises a first pressure sensor on a first mounting plate positioned on the left side of the foundation pit and a second pressure sensor on the first mounting plate positioned on the right side of the foundation pit; the remote control unit receives the electric signals of the first piezoelectric sensor group or the second piezoelectric sensor group as measurement result values according to preset first intermediate variable values; and the remote control unit receives the electric signals of the light pressure sensor and/or the heavy pressure sensor as measurement result values according to the preset second intermediate variable value.
Description
Technical Field
The present invention relates generally to the field of road weighing, and more particularly to a piezoelectric sensor based on a vehicle dynamic weight sensing array.
Background
The piezoelectric sensor is a sensor based on a piezoelectric effect, and is a self-generating and electromechanical conversion type sensor. Its sensitive element is made of piezoelectric material. The piezoelectric material generates electric charges on the surface after being stressed. The charge is amplified by the charge amplifier and the measuring circuit and transformed into impedance, and then the electric quantity proportional to the external force is output. Piezoelectric transducers are used to measure forces and non-electrical physical quantities that can be converted into electricity. Its advantages are wide frequency band, high sensitivity, high S/N ratio, simple structure, high reliability and light weight. The disadvantages are that some piezoelectric materials require moisture protection and poor output dc response, which requires high input impedance circuits or charge amplifiers to overcome.
When highway is weighed the vehicle, generally use piezoelectric sensor to weigh, generally dig the foundation ditch on ground, the weighing device that will have piezoelectric sensor installs and weighs in the foundation ditch, among the prior art, because weighing plate and ground foundation ditch can form great clearance, when using for a long time, there is a large amount of stones to get into in these great clearances, the accumulation comes down in the long year, can influence the normal use of the inside piezoelectric sensor of foundation ditch, and there is rainwater accumulation easily in the foundation ditch, influence piezoelectric sensor's life. To this end, the present invention provides a piezoelectric sensor based on a vehicle dynamic weight sensing array to at least partially address the above-mentioned problems.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description section. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
To at least partially solve the above technical problem, the present invention provides a piezoelectric sensor based on a vehicle dynamic weight measuring array, comprising: the weighing device comprises a weighing unit, a sensing unit and a remote control unit;
the sensing unit comprises a first piezoelectric sensor group, a second piezoelectric sensor group and a transverse pressure sensor group;
the weighing unit comprises a foundation pit and a weighing plate, the bottom of the inner wall of the foundation pit is fixedly connected with a stabilizing plate, the bottoms of the first piezoelectric sensor group and the second piezoelectric sensor group are fixedly connected with the top of the stabilizing plate, the two sides of the inner wall of the foundation pit are movably connected with a first half box body, the two sides of the inner wall of the foundation pit are respectively provided with a first slide rail, the sides of the two first half box bodies, which are far away from each other, are respectively provided with a first slide groove matched with the two first slide rails, the two sides of the weighing plate are respectively movably connected with a second half box body, the two sides of the weighing plate are respectively provided with a second slide rail, the sides of the two second half box bodies, which are close to each other, are respectively provided with a second slide groove matched with the two second slide rails, the front surface and the back surface of the second half box body are respectively fixedly connected with a third slide rail, the front surface and the back surface of the inner wall of, the bottom of the first half box body is fixedly connected with a first fixed block, the bottom of the second half box body is fixedly connected with a second fixed block, a telescopic spring is fixedly connected between one sides of the first fixed block and the second fixed block, pull plates are fixedly connected to the front side and the back side of the first half box body through fixed shafts, and pull rings are fixedly connected to the tops of the two pull plates;
the two sides of the inner wall of the foundation pit are fixedly connected with first mounting plates, the two sides of the weighing plate are fixedly connected with second mounting plates, the transverse pressure sensor group comprises a first pressure sensor positioned on the first mounting plate on the left side of the foundation pit and a second pressure sensor positioned on the first mounting plate on the right side of the foundation pit, and the first pressure sensor and the second pressure sensor are connected with the corresponding second mounting plates through buffer springs; the first piezoelectric sensor group is fixedly arranged at the left upper part of the stabilizing plate, and the second piezoelectric sensor group is fixedly arranged at the right upper part of the stabilizing plate;
the remote control unit is electrically connected with the sensing unit, and a preset first parameter value B1 and a preset second parameter value B2 are stored in the remote control unit;
the electric signal input by the first pressure sensor to the remote control unit is sh1, the electric signal input by the second pressure sensor to the remote control unit is sh2, the first piezoelectric sensor group and the second piezoelectric sensor group both comprise a light pressure sensor and a heavy pressure sensor, the electric signal input by the light pressure sensor of the first piezoelectric sensor group to the remote control unit is sq1, the electric signal input by the heavy pressure sensor of the first piezoelectric sensor group to the remote control unit is sz1, the electric signal input by the light pressure sensor of the second piezoelectric sensor group to the remote control unit is sq2, the electric signal input by the heavy pressure sensor of the second piezoelectric sensor group to the remote control unit is sz2, and the remote control unit selectively receives the first piezoelectric sensor group or the second piezoelectric sensor group according to a preset magnitude relation between first intermediate variable values Z1 and 0 The electrical signals of the sensor group are used as measurement result values.
Further, the first intermediate variable value Z1= sh1-sh2, where sh1 is an electric signal input by the first pressure sensor to the remote control unit, sh2 is an electric signal input by the second pressure sensor to the remote control unit, and when the first intermediate variable value Z1=0, a measurement result value of the remote control unit is 0; when the first intermediate variable value Z1>0, the remote control unit receives the electrical signals of the first group of piezoelectric sensors as measurement result values; when the first intermediate variable value Z1<0, the remote control unit receives the electrical signals of the second group of piezoelectric sensors as measurement result values;
when the buffer spring is in a tension state, the electric signals of the first pressure sensor and the second pressure sensor are positive values, and when the buffer spring is in a compression state, the electric signals of the first pressure sensor and the second pressure sensor are negative values.
Further, the preset first parameter value B1 is smaller than the preset second parameter value B2;
if the variable N =1 or 2;
when sqN-B1 is more than or equal to 0 and szN-B2 is less than or equal to 0, the measurement Result value Result =0.5 (sqN + szN);
when sqN-B1<0, the measurement Result value Result = sqN;
when szN-B2>0, the measurement Result value Result = szN;
if the variable N = 0; measurement Result value Result = 0;
sqN is an electric signal input by the light pressure load sensor of the first piezoelectric sensor group to the remote control unit or an electric signal input by the light pressure load sensor of the second piezoelectric sensor group to the remote control unit, and szN is an electric signal input by the heavy pressure load sensor of the first piezoelectric sensor group to the remote control unit or an electric signal input by the heavy pressure load sensor of the second piezoelectric sensor group to the remote control unit.
Further, when the first intermediate variable value Z1>0, variable N = 1; when the first intermediate variable value Z1<0, variable N = 2.
Further, the first piezoelectric sensor group comprises at least one heavy pressure load sensor and at least one light pressure load sensor; the second piezoelectric sensor group comprises at least one heavy pressure load cell and at least one light pressure load cell; the heavy pressure and light pressure sensors are fixedly arranged on the stabilizing plate in a staggered mode.
Further, the equal fixedly connected with first stopper in both sides of foundation ditch inner wall, two the bottom of first half box contacts with the top of two first stoppers respectively.
Furthermore, two sides of the weighing plate are fixedly connected with second limiting blocks, and the bottoms of the two second half boxes are respectively contacted with the tops of the two second limiting blocks.
Furthermore, water accumulating tanks are mounted on two sides of the foundation pit, water guide plates are fixedly connected to two sides of the weighing plate, and one side of each water guide plate penetrates through the water accumulating tank and extends to the inside of the water accumulating tank.
Furthermore, two the logical groove of mutually close one side of ponding case all seted up with two water guide plate looks adaptations is two the equal fixed connection water pump in bottom of ponding incasement wall.
Furthermore, the water outlet of the water pump is communicated with a guide pipe, and one end, far away from the water pump, of the guide pipe sequentially penetrates through the water accumulating tank and the foundation pit and extends to the outside of the foundation pit.
The invention has the beneficial effects that: the remote control device comprises a light pressure load sensor and a heavy pressure load sensor, wherein an electric signal input to the remote control unit by the light pressure load sensor of the first piezoelectric sensor group is sq1, an electric signal input to the remote control unit by the heavy pressure load sensor of the first piezoelectric sensor group is sz1, an electric signal input to the remote control unit by the light pressure load sensor of the second piezoelectric sensor group is sq2, and an electric signal input to the remote control unit by the heavy pressure load sensor of the second piezoelectric sensor group is sz 2; if the variable N =1 or 2; when sqN-B1 is more than or equal to 0 and szN-B2 is less than or equal to 0, the measurement Result value Result =0.5 (sqN + szN); when sqN-B1<0, the measurement Result value Result = sqN; when szN-B2>0, the measurement Result value Result = szN; if the variable N = 0; measurement Result value Result = 0; according to the invention, the light pressure sensor is arranged to measure the weight of the small-sized automobile, and the heavy pressure sensor is arranged to measure the weight of the large-sized automobile, so that the measurement accuracy is improved.
According to the invention, the first pressure sensor, the second pressure sensor, the first piezoelectric sensor group and the second piezoelectric sensor group are arranged, so that accurate measurement can be realized by changing a measurement result value no matter which direction an automobile passes through.
The invention is characterized in that a first mounting plate is fixedly connected with both sides of the inner wall of a foundation pit, a second mounting plate is fixedly connected with both sides of a weighing plate, a buffer spring is fixedly connected between one sides of the first mounting plate opposite to the second mounting plate, water accumulating tanks are mounted on both sides of the foundation pit, water guide plates are fixedly connected with both sides of the weighing plate, one side of each water guide plate penetrates through the water accumulating tank and extends to the inside of the water accumulating tank, through grooves matched with the two water guide plates are formed in the mutually adjacent sides of the two water accumulating tanks, water pumps are fixedly connected with the bottoms of the inner walls of the two water accumulating tanks, water outlets of the water pumps are communicated with a guide pipe, one end of each guide pipe, which is far away from the water pumps, sequentially penetrates through the water accumulating tanks and the foundation pit and extends to the outside of the foundation pit, the buffer spring is arranged to facilitate the buffer of the, be convenient for collect and discharge the inside water of entering foundation ditch, prevent piling up of inside rainwater.
Drawings
In order that the advantages of the invention will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered to be limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings.
FIG. 1 is a front view of the internal structure of the present invention;
FIG. 2 is an enlarged view of a portion of the invention at A in FIG. 1;
FIG. 3 is a perspective view of a second half-tank configuration of the present invention;
FIG. 4 is a perspective view of a first half-shell construction of the present invention;
FIG. 5 is a front view of the internal structure of the water retention tank of the present invention.
In the figure: 1-foundation pit, 201-first piezoelectric sensor group, 202-second piezoelectric sensor group, 203-transverse pressure sensor group, 3-weighing plate, 4-first half box body, 5-first slide rail, 6-first slide groove, 7-second half box body, 8-second slide rail, 9-second slide groove, 10-third slide rail, 11-third slide groove, 12-first fixed block, 13-second fixed block, 14-expansion spring, 15-fixed shaft, 16-pulling plate, 17-pulling ring, 18-first limited block, 19-second limited block, 20-first mounting plate, 21-second mounting plate, 22-buffer spring, 23-water accumulating tank, 24-water guide plate, 25-through groove, 26-water pump, 27-conduit, 28-stabilising plate.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.
In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.
In the description of the present invention, the terms "inside", "outside", "longitudinal", "transverse", "upper", "lower", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are for convenience only to describe the present invention without requiring the present invention to be necessarily constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-5, the present invention provides a piezoelectric sensor based on a vehicle dynamic weight measuring array, which includes: the weighing device comprises a weighing unit, a sensing unit and a remote control unit;
the sensing unit comprises a first piezoelectric sensor group 201, a second piezoelectric sensor group 202 and a transverse pressure sensor group 203; the weighing unit comprises a foundation pit 1 and a weighing plate 3, a stabilizing plate 28 is fixedly connected to the bottom of the inner wall of the foundation pit 1, the bottoms of a first piezoelectric sensor group 201 and a second piezoelectric sensor group 202 are fixedly connected with the top of the stabilizing plate 28, first half box bodies 4 are movably connected to two sides of the inner wall of the foundation pit 1, first slide rails 5 are arranged on two sides of the inner wall of the foundation pit 1, first slide grooves 6 matched with the two first slide rails 5 are arranged on one sides, far away from each other, of the two first half box bodies 4, the first slide grooves 6 are matched with the first slide rails 5, so that the first half box bodies 4 can slide up and down along the first slide rails 5, the first half box bodies 4 can be taken out conveniently, second half box bodies 7 are movably connected to two sides of the weighing plate 3, second slide rails 8 are arranged on two sides of the weighing plate 3, second slide grooves 9 matched with the two second slide rails 8 are arranged on one sides, near to each other, the second sliding groove 9 is matched with the second sliding rail 8 to facilitate the second half box body 7 to slide up and down along the second sliding rail 8, the second half box body 7 is convenient to take out, the front surface and the back surface of the second half box body 7 are fixedly connected with third sliding rails 10, the front surface and the back surface of the inner wall of the first half box body 4 are respectively provided with a third sliding groove 11 matched with the two third sliding rails 10, the third sliding rails 10 and the third sliding grooves 11 are arranged to facilitate the sliding of the first half box body 4 on the inner wall of the second half box body 7, the bottom of the first half box body 4 is fixedly connected with a first fixed block 12, the bottom of the second half box body 7 is fixedly connected with a second fixed block 13, an expansion spring 14 is fixedly connected between the first fixed block 12 and the second fixed block 13 to facilitate the resetting of the second half box body 7, the front surface and the back surface of the first half box body 4 are fixedly connected with pull plates 16 through fixed, the first half box body 4 is convenient to take out by matching with the pull plate 16, the first limit blocks 18 are fixedly connected to two sides of the inner wall of the foundation pit 1, the first half box body 4 is convenient to limit, the bottoms of the two first half box bodies 4 are respectively contacted with the tops of the two first limit blocks 18, the second limit blocks 19 are fixedly connected to two sides of the weighing plate 3, the second half box body 7 is convenient to limit, the bottoms of the two second half box bodies 7 are respectively contacted with the tops of the two second limit blocks 19, the two sides of the inner wall of the foundation pit 1 are respectively and fixedly connected with the first mounting plate 20, the two sides of the weighing plate 3 are respectively and fixedly connected with the second mounting plate 21, the transverse pressure sensor group 203 comprises a first pressure sensor positioned on the first mounting plate on the left side of the foundation pit 1 and a second pressure sensor positioned on the first mounting plate on the right side of the foundation pit 1, and the second; a first piezoelectric sensor group 201 is fixedly mounted on the upper left of the stabilising plate 28 and a second piezoelectric sensor group 202 is fixedly mounted on the upper right of the stabilising plate 28;
the remote control unit is electrically connected with the sensing unit, and a preset first parameter value B1 and a preset second parameter value B2 are stored in the remote control unit; the electric signal input by the first pressure sensor to the remote control unit is sh1, the electric signal input by the second pressure sensor to the remote control unit is sh2, each of the first piezoelectric sensor group 201 and the second piezoelectric sensor group 202 comprises a light pressure sensor and a heavy pressure sensor, the electric signal input by the light pressure sensor of the first piezoelectric sensor group 201 to the remote control unit is sq1, the electric signal input by the heavy pressure sensor of the first piezoelectric sensor group 201 to the remote control unit is sz1, the electric signal input by the light pressure sensor of the second piezoelectric sensor group 202 to the remote control unit is sq2, the electric signal input by the heavy pressure sensor of the second piezoelectric sensor group 202 to the remote control unit is sz2, and the remote control unit receives the electric signal of the first piezoelectric sensor group 201 or the second piezoelectric sensor group 202 as a measurement result value according to a preset first intermediate variable value Z1.
When the weighing device works, when a vehicle is weighed by the weighing plate 3, the weighing plate 3 is shaken, the buffer spring 22 is extruded to buffer the inner wall of the foundation pit 1 and drive the second half box body 7 to move, the second half box body 7 slides on the inner wall of the first half box body 4 through the matching of the third slide rail 10 and the third slide groove 11, external stones enter the first half box body 4 and the second half box body 7 through the gap between the weighing plate 3 and the foundation pit 1, the stones are collected by the first half box body 4 and the second half box body 7, the first half box body 4 is convenient to reset in the shaking process by the telescopic spring 14, when the stones in the first half box body 4 and the second half box body 7 are more, the pull ring 17 can be pulled to drive the second half box body 7 to move upwards in cooperation with the pull plate 16, the first half box body 4 is driven to move upwards together, the first half box body 4 and the second half box body 7 can be taken out to carry out centralized treatment, rainwater enters the water accumulating tank 23 through the water guide plate 24 and the through groove 25 after flowing into the foundation pit 1.
Specifically, the first intermediate variable value Z1= sh1-sh2, in the formula, the electric signal input by the first pressure sensor 201 to the remote control unit is sh1, the electric signal input by the second pressure sensor 202 to the remote control unit is sh2, and when the first intermediate variable value Z1=0, the measurement result value of the remote control unit is 0; when the first intermediate variable value Z1>0, the remote control unit receives the electrical signals of the first group of piezoelectric sensors 201 as measurement result values; when the first intermediate variable value Z1<0, the remote control unit receives the electrical signal of the second group of piezoelectric sensors 202 as the measurement result value.
When the buffer spring is in a tension state, the electric signals of the first pressure sensor and the second pressure sensor are positive values, and when the buffer spring is in a compression state, the electric signals of the first pressure sensor and the second pressure sensor are negative values.
The preset first parameter value B1 is smaller than the preset second parameter value B2;
if the variable N =1 or 2;
when sqN-B1 is more than or equal to 0 and szN-B2 is less than or equal to 0, the measurement Result value Result =0.5 (sqN + szN);
when sqN-B1<0, the measurement Result value Result = sqN;
when szN-B2>0, the measurement Result value Result = szN;
if the variable N = 0; measurement Result value Result = 0;
sqN is an electric signal inputted from the light pressure load sensor of the first piezoelectric sensor group 201 to the remote control unit or an electric signal inputted from the light pressure load sensor of the second piezoelectric sensor group 202 to the remote control unit, and szN is an electric signal inputted from the heavy pressure load sensor of the first piezoelectric sensor group 201 to the remote control unit or an electric signal inputted from the heavy pressure load sensor of the second piezoelectric sensor group 202 to the remote control unit.
When the first intermediate variable value Z1>0, the variable N = 1; when the first intermediate variable value Z1<0, the variable N = 2. In the present invention, the first piezoelectric sensor group 201 includes at least one heavy pressure load cell (not shown in the figure) and at least one light pressure load cell (not shown in the figure); the second group of piezoelectric sensors 202 includes at least one heavy pressure load cell and at least one light pressure load cell; the heavy pressure sensor and the light pressure sensor are fixedly arranged on the stabilizing plate 28 in a staggered mode.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "component" and the like, when used herein, can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like, as used herein, may refer to one component as being directly attached to another component or one component as being attached to another component through intervening components. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.
Claims (9)
1. A piezoelectric sensor based on a vehicle dynamic weight sensing array, comprising: the weighing device comprises a weighing unit, a sensing unit and a remote control unit;
the sensing unit comprises a first piezoelectric sensor group, a second piezoelectric sensor group and a transverse pressure sensor group;
the weighing unit comprises a foundation pit and a weighing plate, the bottom of the inner wall of the foundation pit is fixedly connected with a stabilizing plate, the bottoms of the first piezoelectric sensor group and the second piezoelectric sensor group are fixedly connected with the top of the stabilizing plate, the two sides of the inner wall of the foundation pit are movably connected with a first half box body, the two sides of the inner wall of the foundation pit are respectively provided with a first slide rail, the sides of the two first half box bodies, which are far away from each other, are respectively provided with a first slide groove matched with the two first slide rails, the two sides of the weighing plate are respectively movably connected with a second half box body, the two sides of the weighing plate are respectively provided with a second slide rail, the sides of the two second half box bodies, which are close to each other, are respectively provided with a second slide groove matched with the two second slide rails, the front surface and the back surface of the second half box body are respectively fixedly connected with a third slide rail, the front surface and the back surface of the inner wall of, the bottom of the first half box body is fixedly connected with a first fixed block, the bottom of the second half box body is fixedly connected with a second fixed block, a telescopic spring is fixedly connected between one sides of the first fixed block and the second fixed block, pull plates are fixedly connected to the front side and the back side of the first half box body through fixed shafts, and pull rings are fixedly connected to the tops of the two pull plates;
the two sides of the inner wall of the foundation pit are fixedly connected with first mounting plates, the two sides of the weighing plate are fixedly connected with second mounting plates, the transverse pressure sensor group comprises a first pressure sensor positioned on the first mounting plate on the left side of the foundation pit and a second pressure sensor positioned on the first mounting plate on the right side of the foundation pit, and the first pressure sensor and the second pressure sensor are connected with the corresponding second mounting plates through buffer springs; the first piezoelectric sensor group is fixedly arranged at the left upper part of the stabilizing plate, and the second piezoelectric sensor group is fixedly arranged at the right upper part of the stabilizing plate;
the remote control unit is electrically connected with the sensing unit, and a preset first parameter value B1 and a preset second parameter value B2 are stored in the remote control unit;
the electric signal input by the first pressure sensor to the remote control unit is sh1, the electric signal input by the second pressure sensor to the remote control unit is sh2, the first piezoelectric sensor group and the second piezoelectric sensor group both comprise a light pressure sensor and a heavy pressure sensor, the electric signal input by the light pressure sensor of the first piezoelectric sensor group to the remote control unit is sq1, the electric signal input by the heavy pressure sensor of the first piezoelectric sensor group to the remote control unit is sz1, the electric signal input by the light pressure sensor of the second piezoelectric sensor group to the remote control unit is sq2, the electric signal input by the heavy pressure sensor of the second piezoelectric sensor group to the remote control unit is sz2, and the remote control unit selectively receives the first piezoelectric sensor group or the second piezoelectric sensor group according to a preset magnitude relation between first intermediate variable values Z1 and 0 The electric signals of the sensor group are used as measurement result values;
the specific judgment method for the remote control unit to select the electrical signal of the first piezoelectric sensor group or the second piezoelectric sensor group as the measurement result value according to the magnitude relation between the preset first intermediate variable value Z1 and 0 is as follows: a first intermediate variable value Z1= sh1-sh2, wherein sh1 is an electric signal input by the first pressure sensor to the remote control unit, sh2 is an electric signal input by the second pressure sensor to the remote control unit, and when the first intermediate variable value Z1=0, a measurement result value of the remote control unit is 0; when the first intermediate variable value Z1>0, the remote control unit receives the electrical signals of the first group of piezoelectric sensors as measurement result values; when the first intermediate variable value Z1<0, the remote control unit receives the electrical signals of the second group of piezoelectric sensors as measurement result values;
when the buffer spring is in a tension state, the electric signals of the first pressure sensor and the second pressure sensor are positive values, and when the buffer spring is in a compression state, the electric signals of the first pressure sensor and the second pressure sensor are negative values.
2. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 1, wherein:
the preset first parameter value B1 is smaller than the preset second parameter value B2;
if the variable N =1 or 2;
when sqN-B1 is more than or equal to 0 and szN-B2 is less than or equal to 0, the measurement Result value Result =0.5 (sqN + szN);
when sqN-B1<0, the measurement Result value Result = sqN;
when szN-B2>0, the measurement Result value Result = szN;
if the variable N = 0; measurement Result value Result = 0;
sqN is an electric signal input by the light pressure load sensor of the first piezoelectric sensor group to the remote control unit or an electric signal input by the light pressure load sensor of the second piezoelectric sensor group to the remote control unit, and szN is an electric signal input by the heavy pressure load sensor of the first piezoelectric sensor group to the remote control unit or an electric signal input by the heavy pressure load sensor of the second piezoelectric sensor group to the remote control unit.
3. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 2, wherein: when the first intermediate variable value Z1>0, variable N = 1; when the first intermediate variable value Z1<0, variable N = 2.
4. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 3, wherein: the first piezoelectric sensor group comprises at least one heavy pressure load cell and at least one light pressure load cell; the second piezoelectric sensor group comprises at least one heavy pressure load cell and at least one light pressure load cell; the heavy pressure and light pressure sensors are fixedly arranged on the stabilizing plate in a staggered mode.
5. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 4, wherein: the equal fixedly connected with first stopper in both sides of foundation ditch inner wall, two the bottom of first half box contacts with the top of two first stoppers respectively.
6. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 5, wherein: and the two sides of the weighing plate are fixedly connected with second limiting blocks, and the bottoms of the two second half boxes are respectively contacted with the tops of the two second limiting blocks.
7. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 6, wherein: water accumulation tanks are mounted on two sides of the foundation pit, water guide plates are fixedly connected to two sides of the weighing plate, and one side of each water guide plate penetrates through each water accumulation tank and extends to the inside of each water accumulation tank.
8. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 7, wherein: two the logical groove of mutually approaching one side of ponding case all sets up with two water guide plate looks adaptations, two the equal fixed connection water pump in bottom of ponding case inner wall.
9. The vehicle dynamic weight sensing array based piezoelectric sensor of claim 8, wherein: the water outlet of the water pump is communicated with a guide pipe, and one end, far away from the water pump, of the guide pipe sequentially penetrates through the water accumulating tank and the foundation pit and extends to the outside of the foundation pit.
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| CN111678625B (en) * | 2020-08-11 | 2020-12-08 | 山东道永盛信息科技有限公司 | Wheel shaft detection device based on dot-matrix pressure-sensitive sensor |
| CN112202639B (en) * | 2020-09-30 | 2022-08-09 | 重庆长安汽车股份有限公司 | Performance test method for realizing Internet of vehicles remote control service through LoadRunner tool |
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