CN105019704A - Stereo garage safety monitoring system based on three-dimensional pressure detection - Google Patents

Abstract

The invention relates to a stereo garage safety monitoring system based on three-dimensional pressure detection and belongs to the technical field of stereo garages. A stereo garage comprises a garage frame, supporting columns, vehicle storage frames and driving mechanisms, wherein the driving mechanisms are connected with the vehicle storage frames and drive the vehicle storage frames to ascend/descend. The safety monitoring system comprises pressure monitoring units, judgment units for judging monitored signals and set system threshold values, protection layer units and processors, wherein the pressure monitoring units are installed on the vehicle storage frames for vehicle parking of the stereo garage, three-dimensional pressure sensors are arranged in the pressure monitoring units and comprise control units, X-direction capacitor cell groups and Y-direction capacitor cell groups, and the X-direction capacitor cell groups and the Y-direction capacitor cell groups are respectively connected with the control units. The problem that the vehicle storage frames of a stereo garage of a simple structure are unbalanced in stress and inclination occurs is solved, and the stereo garage safety monitoring system has the advantages that the stresses of the vehicle storage frames are systematically monitored, and self protection is started when the vehicle storage frames of the stereo garage incline.

Description

Based on the multi-storied garage safety monitoring system that three-dimensional pressure detects

Technical field

The invention belongs to multi-storied garage technical field, relate to the monitoring direction of multi-storied garage, be specifically related to a kind of multi-storied garage safety monitoring system detected based on three-dimensional pressure.

Background technology

Along with the fast development of Chinese national economy, urban architecture and vehicle get more and more, town site growing tension, especially the quantity of private car sharply increases, parking difficulty problem is caused to become the focus of people's concern, and traditional parking lot land utilization ratio is low, not can solve the nervous contradiction difficult with parking of current urban land.In order to alleviate the problems, solve parking difficulty problem, various multi-storied garage arises at the historic moment, and mainly contains following several: vertical-lifting, lifting cross-sliding type, Vertical Circulating, horizontal-circulating car, multilayer cycling, horizontal mobile, AisleStack, Simple lifting, automobile elvator etc. from the actual conditions of building and use.

In existing multi-storied garage technology, substantially can both carry out the problem that bicycle parking is picked up the car, effectively alleviated current bicycle parking difficulty efficiently and easily.But existing multi-storied garage still has many weak points, such as: stereoscopic garage structure is simple, particularly Simple lifting and automobile elvator, stressed support is the support post in garage, once there is damage or the slip of garage column and parking frame tie point, the parking frame parked cars can be caused to tilt, under serious conditions, park cars slip, can damage wheel and even damage vehicle.

Summary of the invention

According to above the deficiencies in the prior art; the present invention proposes a kind of multi-storied garage safety monitoring system detected based on three-dimensional pressure; by arranging pressure monitoring unit, topping unit and enforcing unit; solve parking frame in the multi-storied garage of simple structure and be subject to the situation of force unbalance run-off the straight; there is the stressed size of system monitoring parking frame; relation between the difference size of comprehensive step analysis power and topping unit perform, multi-storied garage starts the advantage of self-protection when there is the situation that parking frame tilts.

To achieve these goals, the technical scheme that the present invention takes is: a kind of multi-storied garage safety monitoring system detected based on three-dimensional pressure, multi-storied garage comprises garage frame, support post, parking frame and driving mechanism, support post is arranged on garage frame inside, parking frame is arranged in the middle of support post in order to park cars, driving mechanism connects the rise/fall that parking frame drives parking frame, described safety monitoring system comprises pressure monitoring unit, judge the judging unit of the Signals & Systems setting threshold value monitored, topping unit and processor, on the parking frame that pressure monitoring cellular installation multi-storied garage parks cars, pressure monitoring unit connection judgment unit, judging unit connection handling device, processor connects driving mechanism, telescopic topping cellular installation connects driving mechanism on two long limits of parking frame.

In said system, described pressure monitoring unit comprises eight three-dimensional pressure sensors, and every two wheels be arranged on parking frame are parked a little.The pressure signal of described each wheel points is sent to judging unit, and the numerical value carrying out four wheel points after two pressure signals of each wheel points calculate average judges.Three-dimensional pressure sensor is provided with in described pressure monitoring unit, the X-direction capacitor cell group that three-dimensional pressure sensor comprises control unit, be connected respectively with control unit and Y-direction capacitor cell group, described X-direction capacitor cell group and Y-direction capacitor cell group include capacitor cell module, described capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, and each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown.Described capacitor cell module comprises by two or more width a ₀length b ₀strip capacitor cell composition the first strip capacitor cell group and two or more width ka ₀length b ₀strip capacitor cell composition the second strip capacitor cell group.The drive electrode of described each strip capacitor cell is identical with induction electrode width, and the length of drive electrode is greater than induction electrode length, and drive electrode length two ends are reserved left poor position δ respectively _leftwith right poor position δ _right, b _{0 drives}=b _{0 sense}+ δ _right+ δ _left, wherein, b _{0 drives}for the drive electrode length of strip capacitor cell, b _{0 sense}for the induction electrode length of strip capacitor cell.Described poor position δ _left=δ _right, and wherein d ₀for strip capacitor cell dielectric thickness, G is the shearing modulus of elastic fluid, τ _maxfor maximum stress value.The lead-in wire that described comb teeth-shaped structure comprises more than 20 strip capacitor cells, connects one to one with strip capacitor cell, is provided with electrode spacing a between adjacent two strip capacitor cells _δ, described parallel-plate area S=M (a ₀+ 2a _δ+ ka ₀) b ₀/ 2, wherein, M is strip capacitor cell quantity, b ₀for the length of strip capacitor cell, a ₀the width of strip capacitor cell.

In said system, first threshold, Second Threshold and the 3rd threshold value is provided with in described judging unit, first threshold is the difference of two pressure signals for more each wheel points, Second Threshold and the 3rd threshold value are the pressure difference values for comparing between four wheel points, Second Threshold is less than the 3rd threshold value, 3rd threshold value is the minimized friction coefficient between wheel and parking frame, and the result of calculation of judging unit is input in processor.Described topping unit comprises the stretchable layer of expansion link composition, the air bag layer being attached to stretchable layer inwall and air pump; multiple expansion link supports alternately and forms rhombus stretchable layer; stretchable layer connects driving mechanism; driving mechanism drives stretchable layer to stretch or launches; air bag layer is attached to and faces on the expansion link inwall in the face of parking cars; air pump connects air bag, and processor connects air pump.Described air bag layer adopts can recover elastomeric material, is repeatedly to inflate and exit the element of repeated work.Described safety monitoring system also comprises the trigger element that performs processor instruction and forces the compulsory execution unit of picking up the car, trigger element and enforce unit connection handling device and to give an order signal according to the instruction of processor.

Beneficial effect of the present invention is: on the parking frame parked cars, installed the gentle cystoblast of stretchable layer in the present invention, according to the inspiration of air bag, under parking frame is in non-equilibrium state, launch the gentle cystoblast of stretchable layer, vehicle is stoped to slide, protect surface of vehicle not swipe simultaneously, also be two three-dimensional pressure sensors detections of dual fail-safe in pressure monitoring in the present invention simultaneously, ensure that the damage of electric elements can not the normal monitoring of influential system easily, in addition, sensor in the present invention is also the highly sensitive parallel-plate differential three-dimensional force three-dimensional pressure sensor selected, effectively measure three-dimensional force, influence each other by effectively solving three-dimensional force, thus make normal direction and tangential conversion all reach higher linear, precision and sensitivity, service factor is stablized.

Accompanying drawing explanation

Below the content expressed by this Figure of description and the mark in figure are briefly described:

Fig. 1 is the work block diagram of the specific embodiment of the present invention.

Fig. 2 is strip capacitor cell and the coordinate system thereof of the specific embodiment of the present invention.

Fig. 3 is the strip capacitor cell schematic diagram of the specific embodiment of the present invention.

Fig. 4 is the strip capacitor cell dextrad skew schematic diagram of the specific embodiment of the present invention.

Fig. 5 is the strip capacitor cell left-hand skew schematic diagram of the specific embodiment of the present invention.

Fig. 6 is the width of the specific embodiment of the present invention is a ₀and ka ₀electric capacity to stressed deflection graph.

Fig. 7 is the parallel-plate three-dimensional force pressure sensor structure figure of the specific embodiment of the present invention.

Fig. 8 is the signal schematic representation that the cell capacitance of the specific embodiment of the present invention is right.

Fig. 9 is the plane-parallel capacitor cross-section structure of the specific embodiment of the present invention.

Figure 10 is the structural representation of the topping unit of the specific embodiment of the present invention.

Figure 11 is the structural representation of the stretchable layer of the specific embodiment of the present invention.

In figure, 1 is garage frame, and 2 is support post, and 3 is parking frame, and 4 is pressure monitoring unit, and 5 is stretchable layer, and 6 is air bag layer, and 7 is upper PCB substrate, and 8 is lower PCB substrate, and 9 is drive electrode Copper Foil, and 10 is induction electrode Copper Foil.

Detailed description of the invention

Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and operating principle, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.

A kind of multi-storied garage safety monitoring system detected based on three-dimensional pressure provided by the invention is used to the framework balancing safety monitoring multi-storied garage; be particularly useful for simple and easy class ascending/decending and automobile elvator; guard bar device has been set up on the long limit of garage frame; when the parking frame 3 parking automobile tilts, guardrail is opened when protection automobile slides impaired less automatically.

A kind of multi-storied garage safety monitoring system detected based on three-dimensional pressure; comprise pressure monitoring unit, judging unit, trigger element, topping unit, enforce unit and processor; pressure monitoring unit connection judgment unit; judging unit connection handling device; processor connects trigger element and enforces unit; trigger element connects driving mechanism, and driving mechanism connects topping unit drives.

Multi-storied garage mainly comprises garage frame 1, support post 2, parking frame 3 and driving mechanism, parking frame 3 is arranged between support post 2 and is used for parking a car, driving mechanism connects parking frame 3 and drives parking frame 3 to move thus by automobile parking at high level, just security monitoring is carried out to multi-storied garage in the present invention, improve little to the structure of multi-storied garage, large change can not be caused, install simple.Pressure monitoring unit 4 is arranged on four wheel stress points of parking frame 3, be used for monitoring the safety of parking frame 3, concrete structure is that pressure monitoring unit 4 comprises eight three-dimensional pressure sensors, be arranged on wheel stress point between two, the stressed size of a point monitored by two sensors simultaneously, be sent to judging unit to average, the threshold value of the setting in average and judging unit compared, in threshold interval then output safety signal to processor.Two Sensor monitorings stress point is adopted in the present invention, do not waste equipment, but vehicle weight is larger, in parking lot, the frequency of utilization on parking space is also different, so the damage caused due to factors such as utilization rate height pressurized are large in order to avoid sensor, once sensor degradation, the normal operation of guarantee safety monitoring system will be changed in time, differ and established a capital maintenance personal in parking lot, the normal use of shutdown system can be delayed, so be provided with two Sensor monitoring same points in the present invention, guarantee normally carrying out of security monitoring, also maintenance personal is given maintenance time.In order to shorten the working time of sensor, ensure sensor only operationally between open, also start unit is provided with in the present invention, when vehicle needs to be parked in upper strata, need to press upper strata bicycle parking switch, start unit connects bicycle parking switch, only have when bicycle parking switch is pressed, explanation needs storing cycle on upper strata, now start unit sends work order to monitoring system, monitoring system is started working, all the other time monitoring systems are in holding state, substantially reduce the working time, avoiding the moment in the monitoring stately increases the non-working time, shorten the application life of electric elements.In multi-storied garage, one deck parking stall does not need to arrange parking frame 3, does not need to carry out balance monitoring yet, so parking frame 3 represents more than two layers parking stalls, only has high-rise vehicle just to have equilibrium problem, thus in the present invention start unit connect be upper strata bicycle parking switch.

In the present invention, the three-dimensional pressure sensor of pressure monitoring unit is three-dimensional pressure sensor, three-dimensional pressure sensor provided by the invention improves conventional three-dimensional pressure sensor, certainty of measurement is higher, three-dimensional force pressure sensor, its structural principle as shown below, sensor comprises control unit, the X-direction capacitor cell group be connected respectively with control unit and Y-direction capacitor cell group, described X-direction capacitor cell group and Y-direction capacitor cell group include capacitor cell module, described capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown.Described capacitor cell module comprises by two or more width a ₀length b ₀first strip capacitor cell group of strip capacitor cell composition and two or more width ka ₀length b ₀second strip capacitor cell group of strip capacitor cell composition.The drive electrode of described each strip capacitor cell is identical with induction electrode width, and the length of drive electrode is greater than induction electrode length, and drive electrode length two ends are reserved left poor position δ respectively _leftwith right poor position δ _right, b _{0 drives}=b _{0 sense}+ δ _right+ δ _left, wherein, b _{0 drives}for the drive electrode length of strip capacitor cell, b _{0 sense}for the induction electrode length of strip capacitor cell.Described poor position δ _left=δ _right, and wherein d ₀for dielectric thickness, G is the shearing modulus of elastic fluid, τ _maxfor maximum stress value.The lead-in wire that described comb teeth-shaped structure comprises more than 20 strip capacitor cells, connects one to one with strip capacitor cell, is provided with electrode spacing a between adjacent two strip capacitor cells _δ.Described parallel-plate area S=M (a ₀+ 2a _δ+ ka ₀) b ₀/ 2, wherein, M is strip capacitor cell quantity, b ₀for the length of strip capacitor cell, a ₀the width of strip capacitor cell.The strip capacitor cell lead-in wire of described first strip capacitor cell group and the second strip capacitor cell group is by parallel connection or be independently connected to control unit.The width of described strip capacitor cell wherein, d ₀for dielectric thickness, E is the young's modulus of elasticity of elastic fluid, and G is the shearing modulus of elastic fluid.Described first strip capacitor cell group and be provided with intermediate translator between the second strip capacitor cell group and control unit, intermediate translator is for arranging voltage to electric capacity or frequency to the transmission coefficient of electric capacity.

1, the transfer characteristic of strip capacitor cell

(1) pumping signal and coordinate system

Strip capacitor cell is placed in the rectangular coordinate system shown in Fig. 2, pole plate plane length b ₀, width a ₀, dielectric thickness d ₀.Three-dimensional simulation puts on the external surface of capacitor plate, and the contact active force of generation has Fx, Fy and Fz tri-durection components, and the action direction of Fx and Fy is along X-axis and Y-axis, and the action direction of Fz along OZ axle namely direction, normal direction and shear stress are a kind of stress tensor, can output capacitance respond between the lead-in wire of electrode; Normal stress σ _n=Fn/A, wherein A=a ₀b ₀for pole plate normal direction stress surface, Fn=Fz is normal component; Both side surface produces paired shear stress τ _x=Fx/A, τ _y=Fy/A.

According to the Hooke's law in Elasticity, σ _nand τ _x, τ _yelastic body all will be made to produce corresponding distortion.Wherein,

${\mathrm{\σ}}_n=E\·{\mathrm{\ϵ}}_n=E\·{\mathrm{\δ}}_n/d_0=\frac{F_n}{A}---\left(1\right)$

$\±{\mathrm{\τ}}_x=\±{\mathrm{\γ}}_x\·G=\±G\·{\mathrm{\δ}}_x/d_0=\±\frac{F_x}{A}---\left(2\right)$

$\±{\mathrm{\τ}}_y=\±{\mathrm{\γ}}_y\·G=\±G\·{\mathrm{\δ}}_y/d_0=\±\frac{F_y}{A}---\left(3\right)$

In formula, E is the young's modulus of elasticity (unit: GN/m of elastic fluid ²), G is the shearing modulus (unit: GN/m of elastic fluid ²), δ n is the Normal Displacement (unit: μm) of elastic fluid, and δ x and δ y is the relative dislocation (unit: μm) of the upper and lower two-plate of capacitor, and its sign is pointed to by coordinate axes and determined.

(2) capacitance equation and input-output characteristic thereof

The initial capacitance of rectangular parallel plate capacitor is:

$C_0=\frac{{\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\·a_0\·b_0}{d_0}---\left(4\right)$

In formula, ε ₀vacuum medium electric constant is 8.85PF/m, ε _r=2.5 is dielectric relative dielectric constant.D ₀by σ _nexcitation produce relative deformation ε _n=δ _n/ d ₀=σ _n/ E, substitutes into (4) and obtains input-output characteristic

$C_n={\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\frac{a_0\·b_0}{d_0\left(1-{\mathrm{\ϵ}}_n\right)}={\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\frac{a_0\·b_0}{d_0\left(1-\frac{F_n}{AE}\right)}---\left(5\right)$

(3) linearity under normal stress effect and sensitivity

A, the normal direction linearity

F in (5) formula _nin the denominator, therefore C _n=f (F _n) relation be nonlinear, because of conversion range in maximum value σ _nmaxcompared with dielectric resilient constant E, ε _na very little amount, i.e. ε in denominator _n<<1, (5) are omitted the higher-order shear deformation of more than quadratic power by series expansion, and (5) formula can be reduced to:

$C_n=C_0\left(1+\mathrm{\&epsiv;}\right)=C_0\left(1+\frac{F_n}{A\&CenterDot;E}\right)---\left(6\right)$

Visible at C _nwith F _ntransfer characteristic in the maximum relative error of the normal direction linearity close to zero.

B, sensitivity

By the definition of normal direction sensitivity

Can linear sensitivity be obtained by (6) formula,

S _n1＝C ₀/AE＝ε ₀ε _r/d ₀E (7)

By (5) formula then

$S_{n2}=\frac{{\mathrm{dC}}_n}{{\mathrm{dF}}_n}=C_0\&CenterDot;\frac{1}{1-2\mathrm{\&epsiv;}}=C_0\&CenterDot;\frac{1}{1-2\frac{F_n}{A\&CenterDot;E}}---\left(8\right)$

S _n2with F _nand become, F _nlarger, S _n2larger, in mild nonlinear in whole transfer characteristic.

(4) shear stress τ _xand τ _ycapacitance variations under excitation

Shear stress τ _xand τ _ydo not change the physical dimension parameter b of pole plate ₀and a ₀, to dielectric thickness d ₀also do not have an impact.But τ _xand τ _ychange the space structures of strip capacitor cell, between the upper bottom crown faced by forward, there occurs dislocation skew.Now for OX direction, pole plate is at τ _xdislocation skew δ under effect _x.

Work as τ in figure 3 _xwhen being zero, a _{on 0}=a _{0 time}just right, useful cross section A between substrate _τ=a ₀b ₀; In the diagram, at τ _xunder the effect of dextrad, top crown creates dislocation skew δ to the right relative to bottom crown _x, thus make the effective area A between bottom crown when calculating electric capacity _τ=(a ₀-δ _x) b ₀; In Fig. 5, work as τ _xduring for left-hand, dislocation skew δ _xthen left, A _τ=(a ₀-δ _x) b ₀, τ _xwhen left-hand and dextrad, the reduction of effective area is identical, and consequent electric capacity is:

$C_{\mathrm{\&tau;}x}=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;\left(a_0-{\mathrm{\&delta;}}_x\right)\&CenterDot;b_0}{d_0}---\left(9\right)$

According to shearing Hooke's law

τ _x＝γ _x·G＝G·δ _x/d ₀(10)

(10) are substituted into (9) can obtain

$C_{\mathrm{\&tau;}x}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;{\mathrm{\&delta;}}_x\&CenterDot;b_0}{d_0}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0{\mathrm{\&tau;}}_x}{G}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r{F}_x}{{\mathrm{Ca}}_0}---\left(11\right)$

(11) formula is the input-output characteristics under shearing stress, C _τwith τ _xlinear.

And its sensitivity

$S_{\mathrm{\&tau;}x}=\frac{{\mathrm{dC}}_{\mathrm{\&tau;}x}}{{\mathrm{dF}}_x}=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{{\mathrm{Ga}}_0}---\left(12\right)$

The similar analysis in formula (9)-(12) is suitable for and τ equally _ywith C _{τ y}characteristic and technical indicator, the only long limit b of strip capacitor cell in formula ₀oX direction of principal axis should be arranged at, and its minor face a ₀then in OY direction.

2, contact parallel plate capacitor design

(1) planar design of parallel plate capacitor

The original index normal direction Max.contact stress σ of setting _nmaxfor 200Kpa, if the stressed A of normal direction is square 10 × 10mm ², then maximum normal force F _zmaxfor σ _nmaxa=20N.Tangential Max.contact stress τ _maxfor 70Kp, the distribution of force face of shear stress is 10 × 10mm ², then maximum tangential force component F _xmax=F _ymax=τ _maxa=7N.

Strip capacitor cell constructive variations shown in Fig. 4 and Fig. 5, only illustrates that electric capacity exports and shear stress ± τ _xthe relation of input, capacitance increase is all negative, and therefore this initial capacitance structure is not suitable for as right ± τ _xobtain the response increasing and decreasing electric capacity.The present invention adjusts the initial configuration of bottom crown on strip capacitor cell for this reason, and width is a ₀and ka ₀strip capacitor cell form a pair capacitor cell to (C _lwith C _r), specifically as shown in Figure 6.

In Fig. 6, capacitor cell C _land C _relectrode size b ₀, d ₀all identical, width one is a ₀, one is ka ₀, wherein k is constant, is preferably greater than the integer of 1.Work as τ _xwhen=0, C _l=C ₀, C _r=kC ₀, on this basis as at F _xδ is produced under excitation _xmistake skew, offset effect as shown in fig. 4 or 5 will be formed.

$C_L=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;\left(a_0-{\mathrm{\&delta;}}_x\right)}{d_0}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;{\mathrm{\&tau;}}_x}{G}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r{F}_x}{{\mathrm{Ga}}_0}---\left(13\right)$

$C_R=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;\left({\mathrm{Ka}}_0-{\mathrm{\&delta;}}_x\right)}{d_0}={\mathrm{kC}}_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;{\mathrm{\&tau;}}_x}{G}={\mathrm{kC}}_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r{F}_x}{{\mathrm{Ga}}_0}---\left(14\right)$

C _land C _rcapacitor cell is at same τ _xδ will be produced _xwith Δ C _τresponse.

Thus, formula (11) can be revised as

$C_{\mathrm{\&tau;}x}=C_{\mathrm{\&tau;}0}-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{{\mathrm{Ga}}_0}{F}_x$

In formula, for initial capacitance when shearing stress is zero, above formula is shearing stress input-output characteristic, C _{τ x}with F _xlinear relationship, and its sensitivity

Electrode plane see Fig. 7 is arranged, at a 10 × 10mm ²substrate center do cross separate, form four quadrants, upper right first quartile I, upper left second quadrant II, lower-left third quadrant III, bottom right fourth quadrant IV, wherein I, III quadrant is to τ _xmake the capacitor cell combination of response, and II, IV quadrant is to τ _ymake the capacitor cell combination of response.Object-line is 10 × 10mm ²pcb board four edge lines, hachure part represents the outer mode cross section of wax-loss casting process.Using the position of induction electrode in lower floor's PCB substrate as reference, then the layout of drive electrode in the PCB substrate of upper strata should with PCB substrate edge line for benchmark.In figure, four dashed rectangle are the benchmark of induction electrode on bottom crown, put they and geometry datum line differential apart from being δ ₀(0.1mm).

Capacitor cell module adopts comb structure, and capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, and each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown.By formula (12) a ₀less, the sensitivity of shear stress response is larger, therefore single capacitor cell is strip.If every root strip capacitor cell is wide is a ₀, the groove width between two strip electric capacity is a _δ, then the pitch of every root strip capacitor cell is ka ₀+ a ₀+ 2a _δ.In order to make full use of the plane space of square substrate, M (ka ₀+ a ₀+ 2a _δ) b ₀/ 2 ≈ 1 square substrate surface areas, M is strip electric capacity quantity, then have M (ka ₀+ a ₀+ 2a _δ)=20mm, in formula, groove width a _δunsuitable excessive, otherwise be unfavorable for using the effective plane space on substrate, also unsuitable too small, the constraint of wax-loss casting process is subject to.For making normal direction sensitivity S _nwith tangential sensitivity S _τequal, by formula (7) and (12), make a ₀g=d ₀e, works as d ₀when=0.1mm, k=1.5, thus M can be obtained.

In order to realize τ _xand τ _ybetween tangential response mutually do not have an impact, the drive electrode length two ends reserved difference position δ of strip capacitor cell ₀, therefore b _{0 drives}=b _{0 end}+ 2 δ ₀, wherein at b _{0 drives}two ends length reserved difference potential theory should ensure ${\mathrm{\&delta;}}_0\&GreaterEqual;d_0\&CenterDot;\frac{{\mathrm{\&tau;}}_{\max }}{G},$ Its calculated value is ${10}^{-5}\&times;\frac{70\&times;{10}^3}{2.4\&times;{10}^6}=2.9\&times;{10}^{-8}m={10}^{-2}um<<1um,$ Therefore should b be ensured in technique _{0 drives}-b _{0 end}>=0.01mm.Like this when computing method exports response to electric capacity, ensure τ _xand τ _yany impact is not produced on the response of normal direction electric capacity.

In order to realize τ _xand τ _ydo not produce any impact to the response of normal direction electric capacity, width is a ₀and ka ₀strip capacitor cell form a pair capacitor cell to (C _lwith C _r) carry out publicity reckoning elimination impact each other.Ensure τ _xproduce τ at I, III quadrant capacitor cell _xelectric capacity response, then produce τ at II, IV quadrant capacitor cell _yelectric capacity response, to ensure that capacitor cell in four quadrants is at τ _xand τ _ytwo groups of differential capacitors pair can be produced under tangential excitation.C in the figure 7 _{τ xI}=C _rand C _{τ xIII}=C _lfor conversion τ _xdifferential capacitor pair, and C _{τ xII}=C _land C _{τ xIV}=C _rbe then conversion τ _ydifferential capacitor pair.

(2) calculating of normal stress and tangential force

If width is a in Fig. 7 ₀strip capacitor cell be subject to tangential force τ _x, produce a tangential displacement d _xafter output capacitance value be C ₁, width is ka ₀strip capacitor cell be subject to tangential force τ _x, produce a tangential displacement d _xafter output capacitance value be C ₂, then have:

$C_1=\frac{\mathrm{\&epsiv;}\left(a_0-d_x\right)b_0}{d_n}=\frac{{\mathrm{\&epsiv;a}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;b}}_0{d}_x}{d_n}---\left(15\right)$

$C_2=\frac{\mathrm{\&epsiv;}\left({\mathrm{ka}}_0-d_x\right)b_0}{d_n}=\frac{{\mathrm{\&epsiv;ka}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;b}}_0{d}_x}{d_n}---\left(16\right)$

Obtained by (15)-(16):

$C_1-C_2=\frac{{\mathrm{\&epsiv;a}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;ka}}_0{b}_0}{d_n}$ Calculate:

$d_n=\frac{{\mathrm{\&epsiv;a}}_0{b}_0\left(1-k\right)}{C_1-C_2}---\left(17\right)$

Obtained by (15) * k-(16):

${\mathrm{kC}}_1-C_2=\frac{{\mathrm{\&epsiv;d}}_x{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;kd}}_x{b}_0}{d_n}=\frac{{\mathrm{\&epsiv;d}}_x{b}_0\left(1-k\right)}{d_n},$ (17) are substituted into above formula, can obtain:

$d_x=\frac{a_0\left({\mathrm{kC}}_1-C_2\right)}{C_1-C_2}---\left(18\right)$

According to $d_n=d_0-\mathrm{\&Delta;}d=d_0\left(1-\frac{F_n}{E\&CenterDot;S_0}\right)$

Known: $F_n=\frac{\left(d_n-d_0\right)E\&CenterDot;S_0}{d_0}$

By $\frac{d_x}{d_0}=\mathrm{\&gamma;}=\frac{\mathrm{\&tau;}}{G}=\frac{F_{\mathrm{\&tau;}}}{G\&CenterDot;S_0},$ So $F_{\mathrm{\&tau;}x}=\frac{{\mathrm{GS}}_0{d}_x}{d_0}.$

In above formula, no matter be normal direction excitation F _nor tangentially encourage F _yall not to O _τhave an impact.Namely automatically σ is eliminated _nand τ _yto τ _xthe coupling of total output or interference comprise at signal because every in the computing of subtracting each other, equivalent and the capacitance variations with symbol are eliminated all automatically.And F _yand F _xto σ _ninterference by upper electrode at b ₀direction increases geometrical length 2 δ ₀eliminate.In like manner F can be obtained _{τ y}.

(4) main material selection and characterisitic parameter thereof

The section of structure of comb teeth-shaped plane-parallel capacitor is similar to the sandwich structure shown in Fig. 9.In Fig. 9,7 is upper PCB substrate, and 8 is lower PCB substrate, and 9 is drive electrode, and 10 is induction electrode.Pole plate is apart from d ₀=0.1mm, upper and lower base plate inner space, except copper foil electrode, is PDMS (dimethyl silicone polymer) the superlastic dielectric with lost wax process filling.Its machinery and physical characteristic parameter are young's modulus of elasticity E=6.2MPa, and its shear modulus is G=4.1MPa, relative permittivity ε during dielectric polorization _y=2.5.Because E and G of medium is much smaller than the elastic modulus E of copper _copper=103GPa.Therefore the distortion of capacitor internal medium under stress state is much larger than the distortion of pole plate.

(5) contact conductor design

Be that drive electrode or induction electrode all need to have lead-out wire, consider that each drive electrode is all ground connection in signal level, therefore four groups of drive electrodes only need share same lead-out wire.The induction electrode of four the first strip capacitor cell groups and the second strip capacitor cell group then needs with respective independently lead-out wire, and draw from the side of planar package so whole capacitance component has at least 5 pins, four induction electrodes refer to that X-direction width is a ₀induction electrode and width be ka ₀induction electrode, and Y-direction width is a ₀induction electrode and width be ka ₀induction electrode so that whole assembly top and bottom external surface can contact with measuring object easily.The present invention, under the support of new material and new technology, completes the design of a kind of novel three-dimensional power sensitization capacitance combination, at 10 × 10mm ²stress surface on, be no matter normal direction or tangential, all can transmit stress more uniformly to medium.In literary composition, four cell capacitance are two to combination distribution.In the contact of non-coplanar force and sensor surface, external force only has 1, and electric capacity response but has 4, and whole battery lead plate, all to asking Fn to contribute, simultaneously by two pairs of capacitor combinations composition systems, can obtain F again _xand F _yinformation, thus complete description three-dimensional force.These 4 cell capacitance combinations should complete its basic function, do not interfere with each other again, and this is just achieved by design concept cleverly.

The signal of pressure monitoring unit 4 is sent to judging unit to carry out data and compares, and first compare two numerical value of each monitoring point, the error of two Sensor monitoring numerical value in first threshold, is then Effective Numerical; Then average to two numerical value, the average of four monitoring points compares, if when the error between four averages is within the scope of Second Threshold, then showing that parking frame 3 is in equilibrium state, is safe; If the error between four averages has exceeded the Second Threshold size of setting in the 3rd threshold range, then send alarm signal and open topping unit, 3rd threshold value illustrate parking frame 3 have certain tilt but vehicle can not slide, 3rd threshold value is the minimized friction coefficient between different doughnut and parking frame 3, in order to avoid just in case the situation of sliding occurs vehicle during the unlatching of topping unit; If the error between four averages has exceeded the 3rd threshold value arranged, has illustrated that vehicle has the danger of slip on bicycle parking layer, has then opened topping unit, while force start to pick up the car switch, make vehicle shift out placement in time on the ground and send alarm signal.

The setting of judging unit is the comparison in order to carry out threshold value, and comparative result can be sent to processor, when processor receives danger signal, can send triggering signal to trigger element, trigger element starting protection layer unit.Topping unit is mounted in the stretching device on the long limit of parking frame 3, topping unit comprises the stretchable layer 5 of expansion link composition, be attached to air bag layer 6 and the air pump of stretchable layer inwall, the structural representation of topping unit as shown in Figure 10, stretchable layer is that multiple expansion link supports formation rhombus stretchable layer 5 alternately, the structural representation of stretchable layer as shown in figure 11, stretchable layer 5 is connected on the driving mechanism on parking space, driving mechanism drives stretchable layer 5 stretch or launch, air bag 6 is attached on flexible inwall, face the inwall parked cars, air pump connects air bag 6, driving mechanism drives the step of expansion link and inflation according to the instruction campaign of processor, driving mechanism and air pump connection handling device.

Under original state, stretchable layer 5 is folded states, can not hamper the process up and down of vehicle, avoids vehicle scratching in upper and lower process simultaneously, when trigger element starts, after sending stretch signal, driving mechanism drive stretchable layer launch, processor receive error more than the 3rd threshold value in, air pump just can work and rapidly prevent vehicle to slide on parking frame 3 scratch car face to air bag 6 inflation, in Second Threshold situation, vehicle also can not slide on parking frame 3, does not need to start air bag 6.When airbag actuation, enforce unit and be connected to switch of picking up the car, processor sends order of picking up the car to compulsory execution unit, enforce the instruction of unit executive signal, the switch Received signal strength of picking up the car of parking space control system, automatically being shifted out by car on parking space parks on the ground, waits for car owner or staff's process.When parking space is parked on the ground, air bag starts venting, and air pump is bled the gas releasing in air bag until air bag recovery former state is attached on stretchable layer.

Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.The protection domain that protection scope of the present invention should limit with claims is as the criterion.

Claims (10)

1. the multi-storied garage safety monitoring system detected based on three-dimensional pressure, multi-storied garage comprises garage frame, support post, parking frame and driving mechanism, support post is arranged on garage frame inside, parking frame is arranged in the middle of support post in order to park cars, driving mechanism connects the rise/fall that parking frame drives parking frame, it is characterized in that, described safety monitoring system comprises pressure monitoring unit, judge the judging unit of the Signals & Systems setting threshold value monitored, topping unit and processor, on the parking frame that pressure monitoring cellular installation multi-storied garage parks cars, pressure monitoring unit connection judgment unit, judging unit connection handling device, processor connects driving mechanism, telescopic topping cellular installation connects driving mechanism on two long limits of parking frame, three-dimensional pressure sensor is provided with in described pressure monitoring unit, three-dimensional pressure sensor comprises control unit, the X-direction capacitor cell group be connected respectively with control unit and Y-direction capacitor cell group, described X-direction capacitor cell group and Y-direction capacitor cell group include capacitor cell module, described capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown.

2. multi-storied garage safety monitoring system according to claim 1, is characterized in that, described capacitor cell module comprises by two or more width a ₀length b ₀strip capacitor cell composition the first strip capacitor cell group and two or more width ka ₀length b ₀strip capacitor cell composition the second strip capacitor cell group.

3. multi-storied garage safety monitoring system according to claim 1, it is characterized in that, the drive electrode of described each strip capacitor cell is identical with induction electrode width, and the length of drive electrode is greater than induction electrode length, and drive electrode length two ends are reserved left poor position δ respectively _leftwith right poor position δ _right, b _{0 drives}=b _{0 sense}+ δ _right+ δ _left, wherein, b _{0 drives}for the drive electrode length of strip capacitor cell, b _{0 sense}for the induction electrode length of strip capacitor cell.

4. multi-storied garage safety monitoring system according to claim 3, is characterized in that, described poor position δ _left=δ _right, and wherein d ₀for strip capacitor cell dielectric thickness, G is the shearing modulus of elastic fluid, τ _maxfor maximum stress value.

5. multi-storied garage safety monitoring system according to claim 1, it is characterized in that, the lead-in wire that described comb teeth-shaped structure comprises more than 20 strip capacitor cells, connects one to one with strip capacitor cell, is provided with electrode spacing a between adjacent two strip capacitor cells _δ, described parallel-plate area S=M (a ₀+ 2a _δ+ ka ₀) b ₀/ 2, wherein, M is strip capacitor cell quantity, b ₀for the length of strip capacitor cell, a ₀the width of strip capacitor cell.

6. multi-storied garage safety monitoring system according to claim 1, it is characterized in that, described pressure monitoring unit comprises eight three-dimensional pressure sensors, every two wheels be arranged on parking frame are parked a little, the pressure signal of described each wheel points is sent to judging unit, and the numerical value carrying out four wheel points after two pressure signals of each wheel points calculate average judges.

7. multi-storied garage safety monitoring system according to claim 1, it is characterized in that, first threshold, Second Threshold and the 3rd threshold value is provided with in described judging unit, first threshold is the difference of two pressure signals for more each wheel points, Second Threshold and the 3rd threshold value are the pressure difference values for comparing between four wheel points, Second Threshold is less than the 3rd threshold value, and the 3rd threshold value is the minimized friction coefficient between wheel and parking frame, and the result of calculation of judging unit is input in processor.

8. multi-storied garage safety monitoring system according to claim 1; it is characterized in that; described topping unit comprises the stretchable layer of expansion link composition, the air bag layer being attached to stretchable layer inwall and air pump; multiple expansion link supports alternately and forms rhombus stretchable layer; stretchable layer connects driving mechanism, and driving mechanism drives stretchable layer to stretch or launches, and air bag layer is attached to and faces on the expansion link inwall in the face of parking cars; air pump connects air bag, and processor connects air pump.

9. multi-storied garage safety monitoring system according to claim 8, is characterized in that, described air bag layer adopts can recover elastomeric material, is repeatedly to inflate and exit the element of repeated work.

10. multi-storied garage safety monitoring system according to claim 1; it is characterized in that; described safety monitoring system also comprises the trigger element performing processor instruction and the compulsory execution unit forcing to pick up the car; trigger element and enforce unit connection handling device and to give an order signal according to the instruction of processor; trigger element connects driving mechanism, and driving mechanism connects topping unit.