CN1996220A - Moving sensing system and method therefor - Google Patents

Abstract

A moving detecting system comprises the sensing panel, multi switching unit, detecting unit and control unit. There are several metal sensing zones on the sensing panel with each metal sensing area sequentially set as the detecting sensing zone. Each metal sensing zone electrically connected to a switch unit to switch electric potential of each metal sensing zone. The detecting unit can calculate electric charge recovery time during detecting stage to generate the detecting result signal. The control unit generates moving signal based on the output detecting result signal. It also provides a moving detecting method. It uses capacity effect feature and simple hardware device, moving of the detecting finger on the sensor panel for selection and direction control.

Description

Moving sensing system and method

Technical field

The present invention relates to induction panel (touch panel), relate in particular to a kind of mobile detection (motion detection) System and method for.

Background technology

Generally speaking, each human body itself all has the equivalent capacitance value (equivalent capacitance) that varies in size over the ground.Therefore, when the finger touch of human body during, can change effective (effective) capacitance of the metallic gasket that touches to the button (key) of induction panel or metallic gasket (pad).Even human body does not touch induction panel, the induction panel circuit still can produce some stray capacitances (parasitic capacitance).Many traditional induction panels utilize above-mentioned capacity effect characteristic, and according to stray capacitance discharge and recharge number of times come the sensing human body whether near or the button or the pad of touch sensitive panel.

Fig. 1 is the arrangement plan of traditional moving sensing system.Fig. 2 is the process flow diagram of traditional mobile detection method.

Please refer to Fig. 1, traditional moving sensing system 100 comprises time schedule controller 120, a plurality of metallic gasket 101～10N (N＞1, N is a positive integer), metering unit 130, a plurality of switch 151～15N and control module 140.Time schedule controller 120 produces different each switchs that controls signal to, with the switching position of control switch.Do not having under the situation of human body touch, earlier the switch 151 under arbitrary pad (supposing pad 101) is being received noble potential Vcc, simultaneously with the switch 152～15N ground connection under other pad 10n (1≤n≤N, n are positive integer).At this moment, the noble potential Vcc stray capacitance C that can be produced pad 101 and pad 102 ₁₂Charging.Then, with switch 151 (or pad 101) suspension joint, make stray capacitance C ₁₂Seeing through each resistance R (not shown) discharges naturally.In one section preset time T, repeat above-mentioned step, with write down record at last discharge and recharge number of times M _RefOn the other hand, during when finger touch or near pad 101, produce the stray capacitance C that differs in size between meeting and each pad 10n ₁～C _N, change the effective capacitance value of pad 101 then, influence the number of times that discharges and recharges of pad 101 at last, wherein, voltage V _bBe the big ground voltage that human body contacted.

Please refer to Fig. 2, the employed mobile detection method of traditional induction panel comprises following steps: at first, in step S201, determining do not have under the situation of human body touch, and in one section preset time T, calculate and the record pad on average discharge and recharge number of times M _RefThen, in step S202, whether have in the unknown under the situation of human body touch, in preset time T, calculate the number of times that discharges and recharges of each pad respectively equally.Then, in step S203, respectively relatively each pad discharge and recharge number of times M ₁～M _NWith on average discharge and recharge number of times M _Ref, discharge and recharge number of times M with what judge each pad ₁～M _NWith on average discharge and recharge number of times M _RefBetween gap whether enough big, and then define no human body touch or near pad.If define human body touch, in step S204, system then carries out relevant treatment.If no human body touches, then get back to step S202.

Yet, the effective capacitance value (or capacity effect) of tradition mobile detection technology when sensing is subjected to the interference of outside noise or external environment factor excessive, simultaneously, because everyone equivalent capacitance value that health had is not of uniform size, and can't real-time dynamic correcting, cause the accuracy of this mobile detection technology and the excessive problem of correlativity when different people is used.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of moving sensing system, utilizes simple hardware device, improves the noise resisting ability of integrated circuit.

For reaching above-mentioned purpose, the invention provides a kind of moving sensing system, formed by induction panel, a plurality of switch unit, detecting unit and control module.This induction panel has a plurality of metal sensing zone, and described a plurality of metal sensing zone is set at the detecting induction zone in regular turn.Each switch unit is electrically connected to corresponding metal sensing zone, and according to control signal with the metal sensing zone suspension joint that connected or be electrically connected to first voltage or second voltage; The detecting induction zone is connected to first voltage in the charging stage, and simultaneously, remaining metal sensing zone is connected to second voltage.And when detecting induction zone when reconnaissance phase is floating, remaining metal sensing zone is connected to first voltage.Detecting unit is according to the state of this control signal, the voltage and the preset reference voltage of detecting induction zone, and the discharge time of calculating this detecting induction zone when reconnaissance phase is to produce the detecting consequential signal.And this control module produces preset reference voltage and control signal, and produces movable signal according to the detecting consequential signal that detecting unit is exported.

The technical problem to be solved in the present invention also is to provide a kind of mobile detection method, utilize induction panel to be used as input block and produce movable signal and this induction panel comprises a plurality of metal sensing zone, this mobile detection method comprises following four steps: set step, a plurality of metal sensing zone are set at the detecting induction zone in regular turn; Charge step will be detected induction zone and be connected to first voltage, and remaining metal sensing zone is connected to second voltage simultaneously; The detecting step will be detected the induction zone suspension joint, and remaining metal sensing zone is connected to first voltage simultaneously, and according to the voltage of detecting induction zone and the discharge time that preset reference voltage calculates this detecting induction zone, to produce the detecting consequential signal; And controlled step produces movable signal according to the detecting consequential signal.

The present invention utilizes the capacity effect characteristic, and the difference of phenomenon when phenomenon that the comparison induction panel discharges and recharges naturally and human body touch induction panel is come human body moving on induction panel.A characteristic of the present invention is when reconnaissance phase, in the time of with detecting induction zone suspension joint, remaining metal sensing zone is connected to noble potential V _CC, if having the people to touch the detecting induction zone this moment, the noble potential Vcc of all the other metal sensing zone can make stray capacitance produce effect, so the integrated circuit noise resisting ability improve to the stray capacitance charging around the detecting induction zone.Another characteristic of the present invention is length T discharge time according to each detecting induction zone _Con, dynamically adjust average discharge time of reference value T _RefWith preset reference voltage V _Ref, come the influence of difference or the like the external environment factor of or measurement environment background not of uniform size, to prevent misoperation or false triggering situation in response to everyone equivalent capacitance value that health had.

Description of drawings

Fig. 1 is the arrangement plan of traditional moving sensing system.

Fig. 2 is the process flow diagram of traditional mobile detection method.

Fig. 3 A is the framework calcspar of moving sensing system of the present invention.

Fig. 3 B is a framework calcspar of detecting unit of the present invention.

Fig. 3 C is another embodiment of the framework calcspar of moving sensing system of the present invention.

Fig. 4 A is according to an experimental result of the present invention, discharge time more of the present invention curve T _ConReference value curve T discharge time with dynamic adjustment _Ref

Fig. 4 B is according to another experimental result of the present invention, discharge time more of the present invention curve T _ConReference value curve T discharge time with dynamic adjustment _Ref

Fig. 5 is the process flow diagram of mobile detection method of the present invention.

Embodiment

Fig. 3 A is the framework calcspar of moving sensing system of the present invention.Please refer to Fig. 3 A, moving sensing system of the present invention is made up of induction panel 310, a plurality of switch unit 151～15N (N 〉=2, N is positive integer), detecting unit 330 and control module 340.Induction panel 310 has a plurality of metal sensing zone 301～30N, and during operation, each metal sensing zone is set at the detecting induction zone in regular turn.Each switch unit 15n (1≤n≤N, n are positive integer) is electrically connected to corresponding metal sensing zone, and according to control signal with the metal sensing zone suspension joint that connected or be electrically connected to operating voltage V _CCOr ground voltage GND.When metal sensing zone was set to the detecting induction zone, in the charging stage, its corresponding switch unit should be detected induction zone and be connected to operating voltage V _CC, simultaneously, remaining switch unit is connected to ground voltage GND with its corresponding metal sensing zone.When reconnaissance phase, the corresponding switch unit of detecting induction zone makes this detecting induction zone present floating, and remaining switch unit then is connected to operating voltage V with its corresponding metal sensing zone _CCDetecting unit 330 is according to the state of control signal, the voltage and the preset reference voltage V of detecting induction zone _Ref, when reconnaissance phase, calculate T discharge time of this detecting induction zone _ConTo produce a detecting consequential signal.Control module 340 is except producing preset reference voltage V _RefOutside control signal, and the detecting consequential signal of being exported according to detecting unit 330 produces a movable signal.

Being set at the detecting induction zone with metal sensing zone 301 is example, when the charging stage, except metal sensing zone 301 is connected to noble potential V _CCOutside, the equal ground connection of remaining metal sensing zone.At this moment, if the unmanned metal sensing zone 301 that touches is connected to noble potential V _CC301 of metal sensing zone can be to stray capacitance C ₁₂Charging.If there is the people to touch metal sensing zone 301, be connected to noble potential V _CCMetal sensing zone 301 can be simultaneously to stray capacitance C ₁With C ₁₂Charging (suppose finger touch or during near metal sensing zone 301, can and each metal sensing zone 302～30N between the stray capacitance C that differs in size of generation ₁～C _N), stray capacitance C ₂Almost not effect, so interference of noise is relatively large.When reconnaissance phase, be set to metal sensing zone 301 suspension joints of detecting induction zone, remaining metal sensing zone 302～30N all is connected to noble potential V _CCAt this moment, if the unmanned metal sensing zone 301 that touches is connected to noble potential V _CC302 of metal sensing zone to stray capacitance C ₁₂Charging.If have the people to touch metal sensing zone 301 this moment, the noble potential Vcc of metal sensing zone 302 can be to stray capacitance C ₁, C ₂With C ₁₂Charging, C ₂Produced effect, so the integrated circuit noise resisting ability improves.

Detecting unit 330 has two kinds to implement pattern, and first kind of detecting unit 330 of implementing pattern comprises a plurality of detecting voltage devices 331, is connected to corresponding metal sensing zone respectively.331 states according to control signal of each detecting voltage device activate detecting.Second kind of detecting unit 330 of implementing pattern comprises multiplexer 332 and detecting voltage device 331, and the input end of detecting voltage device 331 is connected to the output terminal 332 of multiplexer.Please refer to Fig. 3 B, the input end of multiplexer 332 is connected to each metal sensing zone, and will detect the voltage output of induction zone according to the state of this control signal.

The voltage of detecting induction zone in the time of can deriving discharge according to the loop theorem

$i\×R+\frac{q}{C_{\mathrm{eq}}}=0\⇒\∫\frac{\mathrm{dq}}{q}=\∫-\frac{\mathrm{dt}}{{\mathrm{RC}}_{\mathrm{eq}}}=>q={\mathrm{Be}}^{-t/{\mathrm{Rc}}_{\mathrm{eq}}}$

(when t=0, q=q ₀=ε C _Eq), $B=\mathrm{\ϵ}{C}_{\mathrm{eq}}=>q=\mathrm{\ϵ}{C}_{\mathrm{eq}}{e}^{-t/{\mathrm{RC}}_{\mathrm{eq}}}$

$\⇒V_{\mathrm{con}}=\frac{q}{C_{\mathrm{eq}}}=\mathrm{\ϵ}\×e^{-t/{\mathrm{RC}}_{\mathrm{eq}}}$

Wherein, C _EqBe the equivalent capacitance value of metal sensing zone, can whether touch or the different and difference to some extent of measurement environment background ε=V according to human body _CCDischarge resistance R (not shown) is connected to each metal sensing zone, its other end ground connection.In the reconnaissance phase when t=0, the voltage V when just detecting induction zone and just having begun to discharge _Con=ε, the equivalent capacitance value of detecting induction zone is big more, V _ConMore little.Each metal sensing zone is set at the detecting induction zone in regular turn respectively, when each detects induction zone by voltage V _Con=ε is discharged to V _Con=V _RefThe time, length discharge time of metal sensing zone respectively detected in record respectively, and with it on average to obtain detecting average discharge time of the reference value T of metal sensing zone _Ref

Determining do not have under the situation of human body touch, the present invention calculates average discharge time of the reference value T of all detecting induction zones earlier _Ref, just will detect induction zone earlier and be connected to operating voltage V in the charging stage _CC, simultaneously, remaining metal sensing zone is connected to ground voltage GND.Then, will detect the induction zone suspension joint, remaining metal sensing zone is connected to operating voltage V simultaneously _CC, and according to the voltage and the preset reference voltage V that detect induction zone _RefTo calculate average discharge time of the T respectively detect induction zone _Ref

Whether have in the unknown under the situation of human body touch, detecting unit 330 calculates in regular turn and respectively detects induction zone and be discharged to voltage and equal preset reference voltage V when reconnaissance phase begins to detect _RefLength T discharge time _ConDetecting unit 330 compares length T discharge time of each metal sensing zone respectively _ConWith average discharge time of reference value T _RefBetween lead time whether greater than time critical values T _Th(error range) is to have judged whether human body touch.If length T discharge time of arbitrary detecting induction zone _ConWith average discharge time of reference value T _RefBetween lead time greater than time critical values T _Th, expression has human body touch, and detecting unit 330 will be detected the consequential signal activation.Otherwise, if length T discharge time of detecting induction zone _ConWith average discharge time of reference value T _RefBetween lead time all less than time critical values T _Th, expression is unmanned to be touched, and detecting unit 330 will be detected the consequential signal forbidden energy.Simultaneously, moving sensing system 300 is also detected length T discharge time of induction zone respectively according to each _Con, revise average discharge time of reference value T _RefWith preset reference voltage V _RefBecause everyone equivalent capacitance value that health had is not of uniform size or the influence of the difference of measurement environment background or the like external environment factor, must dynamically adjust average discharge time of reference value T _RefWith preset reference voltage V _Ref, to prevent misoperation or false triggering situation.

Fig. 3 C is another embodiment of the framework calcspar of moving sensing system of the present invention.The moving sensing system 300 ' of Fig. 3 C is identical haply with the moving sensing system 300 of Fig. 3 A, unique difference is that the moving sensing system 300 ' of Fig. 3 C is detected induction zone via switch unit ground connection when the charging stage, and other induction panel is received operating voltage Vcc via switch unit.Afterwards, when reconnaissance phase, the detecting induction zone switches to suspension joint via switch unit, and other induction panel is via switch unit ground connection.Remaining manner of execution is all identical.So, moving sensing system 300 ' and the difference of moving sensing system 300 be electric capacity to discharge and recharge direction opposite.

Fig. 4 A is according to an experimental result of the present invention, discharge time more of the present invention curve T _ConReference value curve T discharge time with dynamic adjustment _RefFig. 4 B is according to another experimental result of the present invention, discharge time more of the present invention curve T _ConReference value curve T discharge time with dynamic adjustment _Ref

Please refer to Fig. 4 A, when human body when the induction panel, the equivalent capacitance value C of metal sensing zone _EqIncrease, thus discharge time T _ConIncrease.Moving sensing system 300 can be according to curve T discharge time _ConDynamically adjust reference value curve T discharge time _Ref, this discharge time reference value curve T _RefAnd have rise slow, fast characteristic descends.According to this characteristic, when hand is placed on metal sensing zone after one sufficiently long period, discharge time reference value curve T _RefCan revise with curve T discharge time _ConConsistent (shown in Fig. 4 B), at this moment, owing to indifference between two curves, detecting unit 330 can be judged as does not on the contrary have human body to touch.

In the moving sensing system 300, during the activation of each control signal (enable period) all separate, not overlapping, therefore can set and measure discharging and recharging the time of detecting induction zone separately.Metal sensing zone can utilize metallic gasket or metal key-press or general I/O pin (pin) to implement.

Fig. 5 is the process flow diagram of mobile detection method of the present invention.Mobile detection method of the present invention be to utilize induction panel 310 to be used as input block and produce movable signal, and this induction panel 310 comprises a plurality of metal sensing zone 301～30N.This mobile detection method comprises following four steps: at first, in step S501, a plurality of metal sensing zone 301～30N are set at the detecting induction zone in regular turn.Then, in step S502, will detect induction zone and be connected to operating voltage V _CC, simultaneously, remaining metal sensing zone is connected to ground voltage GND.Suppose metal sensing zone 301 is set at the detecting induction zone, at this moment, if unmanned touch, noble potential V _CCOnly can be to stray capacitance C ₁₂Charging.If there is the people to touch metal sensing zone 301, be connected to noble potential V _CCMetal sensing zone 301 can be to stray capacitance C ₁With C ₁₂Charging (suppose finger touch or during near metal sensing zone 301, can and each metal sensing zone 30n between the stray capacitance C that differs in size of generation ₁～C _N), to stray capacitance C ₂Then almost not effect.At this moment, except metal sensing zone 301 is the noble potential, so the equal ground connection of remaining metal sensing zone is stray capacitance C ₂Almost not effect is so interference of noise is relatively large.

Then, in step S503, will detect the induction zone suspension joint, remaining metal sensing zone is connected to operating voltage V simultaneously _CC, and according to the voltage and the preset reference voltage V that detect induction zone _RefCalculate T discharge time of this detecting induction zone _Con, to produce the detecting consequential signal.Suppose metal sensing zone 301 is set at the detecting induction zone, at this moment, if unmanned the touch is connected to noble potential V _CC302 of metal sensing zone to stray capacitance C ₁₂Charging.If there is this moment the people to touch detecting induction zone 301, the noble potential Vcc of metal sensing zone 302 can be to stray capacitance C on every side ₁, C ₂With C ₁₂Charging, C ₂Produced effect, so the integrated circuit noise resisting ability improves.

At last, in step S504, produce movable signal according to the detecting consequential signal.

Determining do not have under the situation of human body touch, the present invention utilizes step 502 and 503 method earlier, calculates average discharge time of the reference value T of all detecting induction zones _RefJust will detect induction zone earlier and be connected to operating voltage V _CC, simultaneously, remaining metal sensing zone is connected to ground voltage GND.Then, will detect the induction zone suspension joint, remaining metal sensing zone is connected to operating voltage V simultaneously _CC, and according to the voltage and the preset reference voltage V that detect induction zone _RefTo calculate average discharge time of the T respectively detect induction zone _Ref

In step S503, when beginning to detect, whether there are the situation of human body touch, detecting unit 330 to calculate in regular turn respectively to detect induction zone to be discharged to voltage in the unknown and equal preset reference voltage V _RefLength T discharge time _ConDetecting unit 330 compares length T discharge time of each metal sensing zone respectively _ConWith average discharge time of reference value T _RefBetween lead time whether greater than time critical values T _Th(error range) is to have judged whether human body touch.If length T discharge time of arbitrary detecting induction zone _ConWith average discharge time of reference value T _RefBetween lead time greater than time critical values T _Th, expression has human body touch, and detecting unit 330 will be detected the consequential signal activation.Otherwise, if length T discharge time of detecting induction zone _ConWith average discharge time of reference value T _RefBetween lead time all less than time critical values T _Th, expression is unmanned to be touched, and detecting unit 330 will be detected the consequential signal forbidden energy.Simultaneously, moving sensing system 300 is also detected length T discharge time of induction zone respectively according to each _Con, revise average discharge time of reference value T _RefWith preset reference voltage V _RefBecause everyone equivalent capacitance value that health had is not of uniform size or the influence of the difference of measurement environment background or the like external environment factor, must dynamically adjust average discharge time of reference value T _RefWith preset reference voltage V _Ref, to prevent misoperation or false triggering situation.

The function mode of moving sensing system 300 in step S504 explains with following Example.Suppose that moving sensing system 300 has only four metal sensing zone, that is n=4, and control module 340 is made as 1 with corresponding position, otherwise is made as 0 after receiving the detecting consequential signal that is enabled.If the bit combination of first leg is 1000, promptly metal sensing zone 301 detects human body touch, and all the other then do not have.The bit combination of second leg is that the bit combination of 0100, the three bout is that the bit combination of 0010, the four bout is 0001.Variation from bit combination, control module 340 is to slide into metal sensing zone 304 from metal sensing zone 301 one tunnel with regard to the hand of knowing the user, defining mobile phenomenon takes place, promptly produce movable signal, can comprise mobile orientation data or option data when promptly not mobile () or the like in this movable signal, system can take corresponding subsequent treatment, for example controls size sound of volume or the like.

Be noted that the above-mentioned practice is that then, all the other metal sensing zone recharge, to measure the voltage V of detecting induction zone to detecting induction zone charging earlier discharge again _ConBe pulled low to and equal preset reference voltage V _RefThe time T discharge time _ConIn the application, moving sensing system 300 also can be carried out opposite action, and just discharge earlier recharges to the detecting induction zone, and then, all the other metal sensing zone are discharged again, to measure the voltage V of detecting induction zone _ConDraw high to equaling preset reference voltage V _RefThe time duration of charging T _Con1, be referred to as the preset charged mode.Therefore, moving sensing system 300 also can utilize the preset charged mode to measure the duration of charging T of each metal sensing zone _Con1, judge whether the contact of human body.

Though more than with embodiment the present invention is described, therefore do not limit scope of the present invention, only otherwise break away from main idea of the present invention, those of ordinary skill in the art can carry out various distortion or change.

Claims (15)

1. a moving sensing system is characterized in that, comprises:

Induction panel has a plurality of metal sensing zone, and described a plurality of metal sensing zone is set at the detecting induction zone in regular turn;

A plurality of switch units, each switch unit is electrically connected to corresponding described metal sensing zone, and according to control signal with the metal sensing zone suspension joint that connected or be electrically connected to first voltage or second voltage, described detecting induction zone is connected to described first voltage in the preparatory stage, remaining metal sensing zone is connected to described second voltage, and described detecting induction zone is floating in reconnaissance phase, and remaining metal sensing zone is connected to described first voltage;

Detecting unit, according to the state of described control signal, the voltage and the preset reference voltage of detecting induction zone, the charge-restoring time of calculating this detecting induction zone when described reconnaissance phase is to produce the detecting consequential signal; And

Control module produces described preset reference voltage and described control signal, and produces movable signal according to the detecting consequential signal that detecting unit is exported.

2. moving sensing system as claimed in claim 1 is characterized in that, described detecting unit comprises a plurality of detecting voltage devices, is connected to corresponding metal sensing zone respectively.

3. moving sensing system as claimed in claim 1 is characterized in that, described detecting unit comprises:

Multiplexer, its input end is connected to described metal sensing zone, and according to the voltage output of described control signal with described detecting induction zone; And

The detecting voltage device is connected to the output terminal of described multiplexer.

4. as claim 1,2 or 3 described each moving sensing systems, it is characterized in that the described preparatory stage is the charging stage, the described charge-restoring time is discharge time.

5. moving sensing system as claimed in claim 4 is characterized in that, described first voltage is operating voltage, and described second voltage is ground voltage.

6. as claim 1,2 or 3 described each moving sensing systems, it is characterized in that the described preparatory stage is a discharge regime, the described charge-restoring time is the duration of charging.

7. moving sensing system as claimed in claim 6 is characterized in that, described first voltage is ground voltage, and described second voltage is operating voltage.

8. mobile detection method utilizes induction panel to be used as input block and produces movable signal and described induction panel comprises a plurality of metal sensing zone, it is characterized in that, comprises following steps:

A plurality of metal sensing zone are set at the detecting induction zone in regular turn;

Charge step described detecting induction zone is connected to first voltage, and remaining metal sensing zone is connected to second voltage; And

The detecting step, with described detecting induction zone suspension joint, and remaining metal sensing zone is connected to described first voltage, and according to the voltage of detecting induction zone and the discharge time that preset reference voltage calculates described detecting induction zone, to produce the detecting consequential signal; And

Controlled step produces described movable signal according to described detecting consequential signal.

9. mobile detection method as claimed in claim 8 is characterized in that, in the described detecting step, and when the voltage of detecting induction zone equals described preset reference voltage, the discharge time that stops to calculate described detecting induction zone.

10. mobile detection method as claimed in claim 9 is characterized in that, also comprises the correction step, according to external environment factor correction average discharge time of reference value and described preset reference voltage.

11. mobile detection method as claimed in claim 8 is characterized in that, described first voltage is operating voltage, and described second voltage is ground voltage.

12. a mobile detection method utilizes induction panel to be used as input block and produces movable signal and described induction panel comprises a plurality of metal sensing zone, it is characterized in that, comprises following steps:

A plurality of metal sensing zone are set at the detecting induction zone in regular turn;

Discharge step described detecting induction zone is connected to first voltage, and remaining metal sensing zone is connected to second voltage; And

The detecting step, with described detecting induction zone suspension joint, and remaining metal sensing zone is connected to described first voltage, and according to the voltage of detecting induction zone and the duration of charging that preset reference voltage calculates described detecting induction zone, to produce the detecting consequential signal; And

Controlled step produces described movable signal according to described detecting consequential signal.

13. mobile detection method as claimed in claim 12 is characterized in that, in the described detecting step, and when the voltage of detecting induction zone equals described preset reference voltage, the duration of charging that stops to calculate described detecting induction zone.

14. mobile detection method as claimed in claim 13 is characterized in that, also comprises the correction step, according to external environment factor correction average charge time reference value and described preset reference voltage.

15. mobile detection method as claimed in claim 12 is characterized in that, described first voltage is ground voltage, and described second voltage is operating voltage.

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