CN105089318A - Induction type three-dimensional garage safety monitoring system - Google Patents

Abstract

The invention relates to an induction type three-dimensional garage safety monitoring system, and belongs to the technical field of three-dimensional garages. A three-dimensional garage comprises a garage framework, a supporting stand column, a vehicle storage rack and a drive mechanism; the safety monitoring system comprises a pressure monitoring unit, a judging unit for judging a monitored signal and a threshold value set by the system, a protective layer unit and a processor, wherein the pressure monitoring unit is mounted on the vehicle storage rack for parking vehicles of the three-dimensional garage; the pressure monitoring unit is connected with the judging unit; the judging unit is connected with the processor; the processor is connected with the drive mechanism; the telescopic protective layer unit is mounted at two long-side connecting drive mechanisms of the vehicle storage rack. According to the induction type three-dimensional garage safety monitoring system, the pressure monitoring unit, the protective layer and a forced actuating unit are arranged, so that the condition that the vehicle storage rack in the three-dimensional garage with a simple structure is inclined because of unbalanced stress is solved; and the induction type three-dimensional garage safety monitoring system has the advantage of starting self-protection when the vehicle storage rack of the three-dimensional garage is inclined during monitoring of stress of the vehicle storage rack.

Description

Induction type multi-storied garage safety monitoring system

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 induction type multi-storied garage safety monitoring system.

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 induction type multi-storied garage safety monitoring system; 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 induction type multi-storied garage safety monitoring system, 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 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.Circular ring type pressure sensor is provided with in pressure monitoring unit, the annulus capacitor cell group that described circular ring type pressure sensor comprises control unit, be connected respectively with control unit and strip capacitor cell group, described annulus capacitor cell group is for surveying the size of tangential force and normal force, described strip capacitor cell group is for measuring the direction of tangential force, and described strip capacitor cell group is arranged on the corner of the outer substrate of annulus capacitor cell group.Described annulus capacitor cell group comprises two to above annulus capacitor cell pair, described annulus capacitor cell is to comprising two annulus capacitor cells, described strip capacitor cell group comprises X-direction differential capacitor unit group and Y-direction differential capacitor unit group, X-direction differential capacitor unit group and Y-direction differential capacitor unit group include two or more and mutually form differential capacitor cell module, the comb teeth-shaped structure that described capacitor cell module is made up of plural strip capacitor cell, each annulus capacitor cell and strip capacitor cell include the drive electrode of top crown and the induction electrode of bottom crown.The induction electrode of described each annulus capacitor cell and drive electrode just to and shape is identical, the drive electrode of described each strip capacitor cell is identical with induction electrode width, the drive electrode length of strip capacitor cell is greater than induction electrode length, the drive electrode length two ends reserved left poor position δ respectively of strip capacitor cell _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 two groups of drive electrodes mutually forming the strip capacitor cell of differential capacitor cell module and induction electrode are provided with the skew that initially misplaces in the width direction, and dislocation bias size is identical, direction is contrary.Described annulus capacitor cell group comprises n donut capacitor cell, wherein wherein, a _flatfor the length of parallel-plate, r _circlefor the width of annulus capacitor cell annulus, a _{δ circle}electrode spacing between adjacent two annulus capacitor cells.

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, it is also the dual pressure sensor detection 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 differential three-dimensional force pressure sensor of highly sensitive parallel-plate selected, effectively measure three-dimensional force, effectively solve three-dimensional force by the method such as differential to influence each other, 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 the donut skew dislocation areal analysis figure of the specific embodiment of the present invention.

Fig. 3 be the specific embodiment of the present invention for the dislocation of outer donut is to external diameter circle analysis chart.

Fig. 4 is the plane design drawing of the parallel plate capacitor of the specific embodiment of the present invention.

Fig. 5 is the structure chart of the drive electrode of the specific embodiment of the present invention.

Fig. 6 is the rectangular coordinate system of the capacity plate antenna plate of the specific embodiment of the present invention.

Fig. 7 is two groups of annulus capacitance group structure charts of the specific embodiment of the present invention.

Fig. 8 is the initial dislocation figure of the differential strip capacitor cell of the specific embodiment of the present invention.

Fig. 9 is the stressed rear deflection graph of differential strip capacitor cell of the specific embodiment of the present invention.

Figure 10 is the differential schematic diagram of signal that the cell capacitance of the specific embodiment of the present invention is right.

Figure 11 is the plane-parallel capacitor cross-section structure of the specific embodiment of the present invention.

Figure 12 is the structural representation of the topping unit of the specific embodiment of the present invention.

Figure 13 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 induction type multi-storied garage safety monitoring system 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 induction type multi-storied garage safety monitoring system; 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 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 pressure sensor of pressure monitoring unit is circular ring type pressure sensor, pressure sensor provided by the invention improves conventional pressure sensor, certainty of measurement is higher, the annulus capacitor cell group that circular ring type pressure sensor comprises control unit, be connected respectively with control unit and strip capacitor cell group, described annulus capacitor cell group is for surveying the size of tangential force and normal force, institute's strip capacitor cell group is for measuring the direction of tangential force, and described strip capacitor cell group is arranged on the corner outside substrate annulus capacitor cell group.Annulus capacitor cell group comprises annulus capacitor cell pair more than two, described annulus capacitor cell is to comprising two annulus capacitor cells, described strip capacitor cell group comprises X-direction differential capacitor unit group and Y-direction differential capacitor unit group, X-direction differential capacitor unit group and Y-direction differential capacitor unit group include two or more and mutually form differential capacitor cell module, described capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, each annulus capacitor cell and strip capacitor cell include the drive electrode of top crown and the induction electrode of bottom crown.The induction electrode of described each annulus capacitor cell and drive electrode just to and shape is identical, the drive electrode of described each strip capacitor cell is identical with induction electrode width, the drive electrode length of strip capacitor cell is greater than induction electrode length, the drive electrode length two ends reserved left poor position δ respectively of strip capacitor cell _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.The left poor position δ of described strip capacitor cell _left=right poor position δ _right, and wherein d ₀for dielectric thickness, G is the shearing modulus of elastic fluid, τ _ymaxfor maximum stress value.Described two groups of drive electrodes mutually forming the strip capacitor cell of differential capacitor cell module and induction electrode are provided with the skew that initially misplaces in the width direction, and dislocation bias size is identical, direction is contrary.Described annulus capacitor cell group comprises n donut capacitor cell, wherein wherein, a _flatfor the length of parallel-plate, r _circlefor the width of annulus capacitor cell annulus, a _{δ circle}electrode spacing between adjacent two annulus capacitance.Described capacitor cell module adopts comb teeth-shaped structure, and X-direction differential capacitor unit group and Y-direction differential capacitor unit group include m strip capacitor cell, wherein, a _flatfor the length of parallel-plate, a _{δ bar}for the electrode spacing between adjacent two strip capacitor cells, a ₀the width of strip capacitor cell.The width r of described donut capacitor cell _circlewith the width a of strip capacitor cell ₀equal; Strip capacitor cell electrode spacing a _{δ bar}with annulus capacitor cell electrode spacing a _{δ circle}equal, 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 annulus capacitor cell group is connected with control unit by a lead-out wire with the drive electrode of strip capacitor cell group, the induction electrode of each annulus capacitor cell of described annulus capacitor cell group goes between separately and to be connected with control unit, and described X-direction differential capacitor unit group is drawn each via a lead-out wire respectively with the capacitor cell module induction electrode of Y-direction differential capacitor unit group and is connected with control unit.Described annulus capacitor cell, be respectively equipped with intermediate translator between capacitor cell module and control unit, converter is for arranging voltage or frequency to the transmission coefficient of electric capacity.

Below in conjunction with accompanying drawing 2-11 to derivation of the present invention and principle, to effect and operating principle, manufacturing process and the operation using method etc. of the mutual alignment between each several part shape, structure, each several part and annexation, each several part, be described in further detail.

1.1 capacitance equation and input-output characteristic thereof

The initial capacitance of parallel-plate is:

$C_0=\frac{{\mathrm{\ϵ}}_0.{\mathrm{\ϵ}}_r\·A_0}{d_0}---\left(1\right)$

In formula, ε ₀vacuum medium electric constant is 8.85PF/m, ε _r=2.5 is dielectric relative dielectric constant, A ₀for the initial right opposite of upper bottom crown amasss.D ₀by σ _nexcitation produce relative deformation ε _n=δ _n/ d ₀=σ _n/ E, (1) formula of substitution obtains input-output characteristic

$C_n={\mathrm{\ϵ}}_0.{\mathrm{\ϵ}}_r\frac{A_0}{d_0\left(1-{\mathrm{\ϵ}}_n\right)}={\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\frac{A_0}{d_0\left(1-\frac{F_n}{AE}\right)}---\left(2\right)$

The linearity under 1.2 normal stress effects and sensitivity

1.2.1 the normal direction linearity

(2) F in formula _nin the denominator, therefore C _n=f (F _n) relation be nonlinear.Because of the maximum value σ in conversion range _nmaxcompared with dielectric resilient constant E, ε _na very little amount, i.e. ε in denominator _n<<1, omits the higher-order shear deformation of more than quadratic power by (2) formula by series expansion, can be reduced to:

$C_n=C_0\left(1+\mathrm{\&epsiv;}\right)=C_0\left(1+\frac{F_n}{A\&CenterDot;E}\right)---\left(3\right)$

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

1.2.2 sensitivity

By the definition of normal direction sensitivity

By (2) formula then

$S_{n2}=\frac{{\mathrm{dC}}_n}{{\mathrm{dF}}_n}=C_0\&CenterDot;\frac{1}{1-2\mathrm{\&epsiv;}}=C_0\&CenterDot;\frac{1}{1-2\frac{F_n}{A\&CenterDot;E}}---\left(4\right)$

Can linear sensitivity be obtained by (3) formula,

S _n1＝C ₀/AE＝ε ₀ε _r/d ₀E(5)

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

Relation between 1.3 tangential displacements and annulus capacitor effective area

For donut electric capacity to analyzing, as shown in Figure 2, R ₁for exradius, R ₂for inner circle radius, r=annular width=large exradius R ₁-inner circle radius R ₂.To the power F on drive electrode tangent plane _x, cause drive electrode corresponding up and down and induction electrode to produce one and shear dislocation, if d _xfor tangent plane displacement, dislocation area is S _inand S _outward, the initial right opposite of battery lead plate is long-pending should be π (R ₁ ²-R ₂ ²).Fig. 3 is that outer donut electric capacity justifies analysis chart to external diameter, and before and after mobile, two distance of center circle are from being d _x, before and after mobile, the intersection point of two centers of circle and two circles forms a rhombus, can calculate S _outwardarea:

In above formula, there is d _x<<R ₁, so get

By

Will taylor series expansion, and omit high-order term,

In like manner, can know, S _in=2R ₂d _x, so the wrong area of donut electric capacity is S=2R ₁d _x+ 2R ₂d _x.

The capacitance variations of the annulus capacitor cell group under 1.4 shear stress τ excitations

Shear stress τ does not change the physical dimension parameter A of pole plate ₀, to dielectric thickness d ₀also do not have an impact.But τ _xand τ _ychange the space structures of plane-parallel capacitor, between the upper bottom crown faced by forward, there occurs dislocation skew.The dislocation offset d of pole plate under τ effect _x.When τ is zero, the upper/lower electrode of annulus capacitor cell is just right, useful cross section between upper/lower electrode in figure 3, at τ _xunder the effect of dextrad, top crown creates dislocation offset d to the right relative to bottom crown _x, thus make the effective area between bottom crown when calculating electric capacity $A_{\mathrm{\&tau;}}=\mathrm{\&pi;}{R}_1^2-\mathrm{\&pi;}{R}_2^2-2R_1{d}_x-2R_2{d}_x,$ Consequent electric capacity is:

$C_{{}_{\mathrm{\&tau;}x}}=\frac{{\mathrm{\&epsiv;}}_0.{\mathrm{\&epsiv;}}_r\&CenterDot;\left({\mathrm{\&pi;R}}_1^2-{\mathrm{\&pi;R}}_2^2-2R_1{d}_x-2R_2{d}_x\right)}{d_0}---\left(6\right)$

According to shearing Hooke's law

τ _x＝γ _x·G＝G·δ _x/d ₀(7)

(7) are substituted into (6) can obtain

$C_{{}_{\mathrm{\&tau;}x}}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;2\left(R_1+R_2\right)d_x}{d_0}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;2\left(R_1+R_2\right)F_x}{A_{\mathrm{\&tau;}}G}=C_0-\frac{2{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r{F}_x}{G\mathrm{\&pi;}\left(R_1-R_2\right)}---\left(8\right)$

(8) formula is the input-output characteristics under shearing stress, C _τwith τ _xlinear, its sensitivity

$S_{\mathrm{\&tau;}x}=\frac{{\mathrm{dC}}_{\mathrm{\&tau;}}}{{\mathrm{dF}}_x}=\frac{2{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{G\mathrm{\&pi;}\left(R_1-R_2\right)}---\left(9\right)$

Tangential sensitivity and R can be found out by formula (9) ₁-R ₂relevant, namely the width of tangential sensitivity and annulus is inversely proportional to, and width more sluggishness is higher.

The design of 2 plate condensers

The design of 2.1 plate condensers

Arrange and the structure chart of Fig. 5 drive electrode, at a 10 × 10mm see the electrode plane in Fig. 4 ²substrate on a kind of circular ring type contact parallel-plate three-dimensional pressure sensor, the annulus capacitor cell group that sensor comprises control unit, be connected respectively with control unit and strip capacitor cell group, annulus capacitor cell group is for surveying the size of tangential force and normal force, strip capacitor cell group is for measuring the direction of tangential force, and strip capacitor cell group is arranged on the corner outside substrate annulus capacitor cell group.Effectively can use the area of parallel-plate like this, annulus capacitor cell group is paved with whole parallel-plate, when measuring three-dimensional force, all work, and strip capacitor cell group effectively make use of annulus capacitor cell group lay after, the space of parallel-plate corner, for measuring the direction of three-dimensional force tangential force.The drive electrode of annulus capacitor cell group and induction electrode are all made up of n donut, and n is even number, then form n/2 annulus capacitor cell pair.Hachure part represents the outer mode cross section of wax-loss casting process, and its geometry and size also should keep accurate when mechanical-moulded.

With reference to the rectangular coordinate system of the capacity plate antenna of Fig. 6, coordinate system origin is at the concentric circles initial point of annulus capacitor cell group, x-axis and y-axis are respectively along the diagonal of capacity plate antenna, X-direction differential capacitor unit group comprises X-direction differential capacitor unit group I and X-direction differential capacitor unit group III, X-direction differential capacitor unit group I and X-direction differential capacitor unit group III lay respectively at the positive and negative semiaxis of x-axis and symmetrical along y-axis, Y-direction differential capacitor unit group comprises Y-direction differential capacitor unit group II and Y-direction differential capacitor unit group IV, Y-direction differential capacitor unit group II and Y-direction differential capacitor unit group IV lay respectively at the positive and negative semiaxis of y-axis and symmetrical along x-axis, X-direction differential capacitor unit group I and X-direction differential capacitor unit group III are formed τ _xmake the differential capacitor unit combination of response, Y-direction differential capacitor unit group II and Y-direction differential capacitor unit group IV are formed τ _ymake the differential capacitor unit combination of response.

Annulus capacitor cell group comprises n donut capacitor cell, wherein wherein, a _flatfor the length of parallel-plate, r _circlefor the width of annulus capacitor cell annulus, a _{δ circle}electrode spacing between adjacent two annulus capacitance.Capacitor cell module adopts comb teeth-shaped structure, and X-direction differential capacitor unit group and Y-direction differential capacitor unit group include m strip capacitor cell, wherein, a _{δ bar}for being provided with electrode spacing, a between adjacent two strip capacitor cells ₀the width of strip capacitor cell.The width r of donut capacitor cell _circlewith the width a of strip capacitor cell ₀equal; Strip capacitor cell electrode spacing a _{δ bar}with annulus capacitance electrode spacing a _{δ circle}equal, 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.

2.2 pumping signals and coordinate system

Annulus capacitor cell is placed in the rectangular coordinate system shown in Fig. 6, three-dimensional simulation puts on the external surface of capacitor plate, the contact active force produced 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, from can the response of output capacitance between the lead-in wire of electrode; Normal stress σ _n=Fn/A, wherein for pole plate normal direction stress surface, Fn=Fz is normal component; Both side surface produces paired shear stress τ _cut=F _cut/ 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,

${\mathrm{\&sigma;}}_n=E\&CenterDot;{\mathrm{\&epsiv;}}_n=E\&CenterDot;{\mathrm{\&delta;}}_n/d_0=\frac{F_n}{A}$

In formula, E is the young's modulus of elasticity GN/m of elastic fluid ², G is the shearing modulus 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 annulus capacitor cell, and its sign is pointed to by coordinate axes and determined.

The calculating of 2.3 normal force and tangential force size

Choosing the n-th annulus capacitor cell and the n-th/2 annulus capacitor cell, by setting up annulus capacitor cell, composition equation group being calculated, as shown in Figure 7.If after battery lead plate is subject to normal direction and tangential incentive action, if the output capacitance of the n-th annulus capacitor cell is C ₁, n/2 annulus capacitor cell output capacitance is C ₂, tangential displacement is d _x, the capacitance pole distance of normal direction is d _n, S ₁₀the right opposite initial for outer shroud amasss, S ₂₀the right opposite initial for inner ring amasss.

$C_1=\frac{\mathrm{\&epsiv;}\left(S_{10}-S1\right)}{d_n}=\frac{\mathrm{\&epsiv;}\left({\mathrm{\&pi;R}}_1^2-{\mathrm{\&pi;R}}_2^2\right)}{d_n}-\frac{\mathrm{\&epsiv;}\left(2R_1{d}_x+2R_2{d}_x\right)}{d_n}$ ①

$C_2=\frac{\mathrm{\&epsiv;}\left(S_{20}-S2\right)}{d_n}=\frac{\mathrm{\&epsiv;}\left({\mathrm{\&pi;r}}_1^2-{\mathrm{\&pi;r}}_2^2\right)}{d_n}-\frac{\mathrm{\&epsiv;}\left(2r_1{d}_x+2r_2{d}_x\right)}{d_n}$ ②

Will 1.-2. * obtain:

$C_1-C_2*\frac{R_1+R_2}{r_1+r_2}=\frac{\mathrm{\&epsiv;}\mathrm{\&pi;}\left(R_1^2-R_2^2\right)}{d_n}-\frac{R_1+R_2}{r_1+r_2}*\frac{\mathrm{\&epsiv;}\mathrm{\&pi;}\left(r_1^2-r_2^2\right)}{d_n}$

If in above formula $\frac{R_1+R_2}{r_1+r_2}=K,$ Then $d_n=\frac{\mathrm{\&epsiv;}(S_{10}-{\mathrm{KS}}_{20})}{C_1-{\mathrm{KC}}_2}$

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

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

Above-mentioned is incited somebody to action 1. * C ₂-2. * C ₁obtain:

$d_x=\frac{C_2{S}_{10}-C_1{S}_{20}}{2C_2\left(R_1+R_2\right)-2C_1\left(r_1+r_2\right)};$

By $\mathrm{\&gamma;}=\frac{\mathrm{\&tau;}}{G}=\frac{F_{\mathrm{\&tau;}}}{G\&CenterDot;S_0}=\frac{d_x}{d_0}=\frac{C_2{S}_{10}-C_1{S}_{20}}{d_{0}2C_2\left(R_1+R_2\right)-d_{0}2C_1\left(r_1+r_2\right)},$ So F _τfor

$F_{\mathrm{\&tau;}}=\frac{(C_2{S}_{10}-C_1{S}_{20})\&CenterDot;G\&CenterDot;S_0}{d_{0}2C_2(R_1+R_2)-d_{0}2C_1(r_1+r_2)}$

The direction determining of 2.4 tangential forces

2.4.1 strip capacitor cell group shape structure and parameter design

In order to realize τ _xand τ _ybetween tangential response mutually do not have an impact, drive electrode length two ends reserved difference position δ ₀, therefore b _{0 drives}=b _{0 end}+ 2 δ ₀, wherein at b _{0 drives}two ends length is reserved should be ensured in theory ${\mathrm{\&delta;}}_0\&GreaterEqual;d_0\&CenterDot;\frac{{\mathrm{\&tau;}}_{y\max }}{G},$ 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.In order to realize τ _xand τ _ydo not have an impact to the response of normal direction electric capacity, the drive electrode of each strip capacitor cell and induction electrode arrange certain dislocation in layout and offset, on by differential elimination impact each other.

As shown in Figure 5, in figure, four dashed rectangle are the benchmark of induction electrode on bottom crown, get 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.Each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown, if often root strip capacitor cell is wide is a ₀, the groove width between two strip capacitor cells is a _δ, then the pitch of every root strip capacitor cell is a ₀+ a _δ.τ can be ensured like this when computing method exports response to electric capacity _xand τ _ythe response of normal direction electric capacity is not had an impact.And put they and geometry datum line differential apart from being δ ₀(0.1mm), to ensure that X-direction differential capacitor unit group I and X-direction differential capacitor unit group III produce τ _xdifferential capacitor export response, Y-direction differential capacitor unit group II and Y-direction differential capacitor unit group IV then only produce τ _ydifferential capacitor response, an initially dislocation skew δ is set _xo, its value should ensure its calculated value and δ ₀similar, its skew that initially misplaces all arranges δ _xo=δ _yo=0.01mm, to ensure that four capacitor cells are at τ _xand τ _ytwo groups of differential capacitors pair can be produced under tangential excitation.

In Fig. 8, a pair electric capacity C _land C _relectrode size a ₀, b ₀, d ₀all identical, initial dislocation skew δ ₀also identical, difference is left side capacitor C _lupper strata δ ₀wedge angle be oriented to+OX, and the right capacitor C _rupper strata δ ₀wedge angle sensing-OX.Work as τ _xwhen=0, namely the electric capacity in figure corresponding to dash area.On this basis, as generation ± δ under-Fx excitation _xdislocation skew, formed as shown in Figure 9 electric capacity increase and decrease effect,

$C_L=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;\left(a_0-{\mathrm{\&delta;}}_0\&PlusMinus;{\mathrm{\&delta;}}_x\right)}{d_0}---\left(10\right)$

In Fig. 9, C _land C _rdifferential capacitor is to same τ _xby generation ± δ _xwith ± △ C _τresponse, δ ₀size should meet desirable δ ₀=10 μm, thus, formula (8) can be revised as

$C_{\mathrm{\&tau;}x}=C_{{}_{\mathrm{\&tau;}0}}\&PlusMinus;\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{{\mathrm{Ga}}_0}{F}_x---\left(11\right)$

In formula, for initial capacitance when shearing stress is zero, (11) formula is shearing stress input-output characteristic, C _{τ x}with F _xlinear relationship, and its sensitivity

By formula (11) known a ₀less, the sensitivity of shear stress response is larger, therefore capacitor cell of the present invention adopts the strip capacitor cell group be made up of multiple strip electric capacity.

2.4.2 shear stress direction calculating

C _ito C _iIand C _iIIto C _iVtwo can be realized to differential combination, the differential schematic diagram of the signal that the cell capacitance as Figure 10 is right, through differential technique process, the overall response of differential output

$O_{\mathrm{\&tau;}x}=\frac{2{\mathrm{mK\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{a_{0}G}{F}_x---\left(15\right)$

In formula, no matter be normal direction excitation F _nor tangentially encourage F _yall not to O _τhave an impact, namely automatically eliminate σ _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 same capacitance variations met 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, $O_{\mathrm{\&tau;}y}=\frac{2{\mathrm{mK\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{a_{0}G}{F}_y;$

According to O _{τ x}and O _{τ y}value calculate the direction of tangential force.

2.4 main material selection and characterisitic parameter thereof

The section of structure of plane-parallel capacitor is similar to sandwich structure as shown in figure 11.As shown in Figure 11,7 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 _γ=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.

2.5 contact conductor designs

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 drive electrode only need share same lead-out wire.Annulus capacitor cell group is connected with control unit by a lead-out wire with the drive electrode of strip capacitor cell group, each annulus of described annulus capacitor cell group goes between separately and to be connected with control unit, control unit calculates according to the output valve independent assortment of each annulus, carry out being averaging the size and normal force size that draw tangential force afterwards, when required precision is not high, annulus capacitor cell group can only select two optimum annulus to draw 2 lead-in wires, obtains d by these two annulus _xand d _n, thus draw size and the normal force size of tangential force; X-direction differential capacitor unit group and Y-direction differential capacitor unit group are drawn each via a lead-out wire respectively and are connected with control unit, for calculating the direction of tangential force.Be provided with intermediate translator between described control unit and capacitor cell, converter is for arranging voltage or frequency to the transmission coefficient of electric capacity.Whole capacitance component has at least 7 pins and draws from the side of planar package, 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 the contact of non-coplanar force and sensor surface, external force only has 1, and can obtain the information of normal direction Fn to electric capacity summation, namely whole battery lead plate is all to asking Fn to contribute, and can obtain F again simultaneously _xand F _yinformation, thus complete description three-dimensional force, can improve the normal direction sensitivity and tangential sensitivity and maximum linear error once changed by design parameters.

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 12, stretchable layer is that multiple expansion link supports formation rhombus stretchable layer 5 alternately, the structural representation of stretchable layer as shown in figure 13, 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. an induction type multi-storied garage safety monitoring system, 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, circular ring type pressure sensor is provided with in pressure monitoring unit, described circular ring type pressure sensor comprises control unit, the annulus capacitor cell group be connected respectively with control unit and strip capacitor cell group, described annulus capacitor cell group is for surveying the size of tangential force and normal force, described strip capacitor cell group is for measuring the direction of tangential force, described strip capacitor cell group is arranged on the corner of the outer substrate of annulus capacitor cell group.

2. induction type multi-storied garage safety monitoring system according to claim 1, it is characterized in that, described annulus capacitor cell group comprises two to above annulus capacitor cell pair, described annulus capacitor cell is to comprising two annulus capacitor cells, described strip capacitor cell group comprises X-direction differential capacitor unit group and Y-direction differential capacitor unit group, X-direction differential capacitor unit group and Y-direction differential capacitor unit group include two or more and mutually form differential capacitor cell module, the comb teeth-shaped structure that described capacitor cell module is made up of plural strip capacitor cell, each annulus capacitor cell and strip capacitor cell include the drive electrode of top crown and the induction electrode of bottom crown.

3. induction type multi-storied garage safety monitoring system according to claim 2, it is characterized in that, the induction electrode of described each annulus capacitor cell and drive electrode just to and shape is identical, the drive electrode of described each strip capacitor cell is identical with induction electrode width, the drive electrode length of strip capacitor cell is greater than induction electrode length, the drive electrode length two ends reserved left poor position δ respectively of strip capacitor cell _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. induction type multi-storied garage safety monitoring system according to claim 2, it is characterized in that, described two groups of drive electrodes mutually forming the strip capacitor cell of differential capacitor cell module and induction electrode are provided with the skew that initially misplaces in the width direction, and dislocation bias size is identical, direction is contrary.

5. induction type multi-storied garage safety monitoring system according to claim 2, is characterized in that, described annulus capacitor cell group comprises n donut capacitor cell, wherein wherein, a _flatfor the length of parallel-plate, r _circlefor the width of annulus capacitor cell annulus, a _{δ circle}electrode spacing between adjacent two annulus capacitor cells.

6. induction type multi-storied garage safety monitoring system according to claim 1, it is characterized in that, described pressure monitoring unit comprises eight 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. induction type 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, 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. induction type 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. induction type 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. induction type 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.