CN104684764A - Occupant detection and classification system - Google Patents
Occupant detection and classification system Download PDFInfo
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- CN104684764A CN104684764A CN201380051102.XA CN201380051102A CN104684764A CN 104684764 A CN104684764 A CN 104684764A CN 201380051102 A CN201380051102 A CN 201380051102A CN 104684764 A CN104684764 A CN 104684764A
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- 238000001514 detection method Methods 0.000 title abstract description 5
- 230000006698 induction Effects 0.000 claims description 83
- 238000005259 measurement Methods 0.000 claims description 53
- 230000008859 change Effects 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 13
- 230000005684 electric field Effects 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010606 normalization Methods 0.000 description 6
- 230000001939 inductive effect Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007634 remodeling Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
- B60R21/01512—Passenger detection systems
- B60R21/0153—Passenger detection systems using field detection presence sensors
- B60R21/01532—Passenger detection systems using field detection presence sensors using electric or capacitive field sensors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
- B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
- B60R21/01512—Passenger detection systems
- B60R21/0153—Passenger detection systems using field detection presence sensors
- B60R21/0154—Passenger detection systems using field detection presence sensors in combination with seat heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0236—Industrial applications for vehicles
- H05B1/0238—For seats
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Seats For Vehicles (AREA)
- Geophysics And Detection Of Objects (AREA)
- Air Bags (AREA)
- Chair Legs, Seat Parts, And Backrests (AREA)
Abstract
An occupant detection system includes a controller, a sensing electrode, and a shield electrode, the electrodes disposed in a vehicle seat. The controller is electrically coupled to the sensing electrode and shield electrode by a sensing circuit. The controller is configured to send an input signal to the sensing electrode, the shield electrode, or both and measures current, impedance, or capacitance values to determine the presence of an object on the seat, to classify the object, or both.
Description
the cross reference of related application
This application claims the rights and interests enjoying the U.S. Patent application 13/633590 that on October 2nd, 2012 submits to, the content of this patent application is all attached in the disclosure at this.
Technical field
The disclosure relates generally to the field of capacitive sensing system and inducing method.More specifically, the disclosure relates to capacitive sensing system for seat and inducing method.
Background technology
There is the demand for carrying out the system and method accurately distinguished in occupant classification system for occupant and the object placed on the seat.
Accompanying drawing explanation
These and other feature of the present invention, aspect and advantage will become obvious according to following description and appended illustrative embodiments, and described embodiment is briefly described as follows hereinafter.
Fig. 1 is the schematic diagram of the seat according to illustrative embodiments.
Fig. 2 A-2C is the schematic diagram of the capacitive sensing system according to illustrative embodiments.
Fig. 3 A and 3B is the schematic diagram of the capacitive sensing system according to another illustrative embodiments.
Fig. 4 is the circuit diagram of the occupant detecting system according to an illustrative embodiments.
Fig. 5 is the schematic diagram of the seat comprising seat heater and occupant detecting system.
Detailed description of the invention
Accompanying drawing shows illustrative embodiments in detail.But should be understood that, the application is not limited to the details of setting forth in a specific embodiment or showing in the accompanying drawings or method.It is to be further understood that term only for describing object and should not being considered to restriction.
Can implement in many ways for the condenser that uses in occupant classification system or occupant's induction system (such as, for detecting the system taken of seat) or electric field sensor.Such as, according to an embodiment, AC electric current can be provided to the induction electrode be positioned in seat.Leading to change in the electric current of sensor or electric current can be measured and be used as the index of the impedance from induction electrode to grounding jumper.Seat heater can be provided in particular vehicle seat configuration.According to an embodiment of occupant's induction system, electrode can work as capacitive sensing electrode and seat heater.
In occupant classification system, use the information of sensor by occupancy classi-fication, described sensor sensing is about the feature of the object be positioned on seat.Total weight on some system sensing seat.When capacitance-type sensor is used for occupancy classi-fication, various technology is used to sense environment above seat cover to identify dielectric and the conductive characteristic of occupant.Conduction sensing element is placed in seat, and according to an embodiment, the impedance from electrode to grounding jumper can be used as the index of the occupant conditions above seat cover.
Occupant detects and categorizing system is configured so that the environment below seat surface does not affect the classification of occupant.When providing seat heater, usually use resistance type heater.Resistance type heater is at the cable or the conductor that are the ground connection be positioned in seat in nature.Induction electrode for occupancy classi-fication and checking system can be placed on above seat heater.If the directed change between induction electrode and temperature booster, then electric capacity skew will change, and described change can cause, for system, the ability of occupant's Accurate classification is caused negative effect.Such as, checking system can be configured to the skew of the measurement comprised for vacant seat chair electric conductivity.If the vacant seat chair skew of measuring is drifted about significantly (such as, the change due to the directed aspect of electrode and temperature booster), then system possibly cannot by occupant's Accurate classification.
According to various illustrative embodiments, the induction system for automobile passenger classification can use various conductors in seat as induction electrode.Such as, induction system can comprise and is positioned at " sensor " conductor above " shielding part " conductor or assembly.Shielding part conductor configuration becomes to reduce induction system for the susceptibility of the object (such as, seat plate, seat heater etc.) below shielding part or reduce from the interference of described object.Due to providing of bucking electrode, therefore occupant's induction system can be maintained at when the induction of shielding part anti-locking system is in the object below induction electrode in the same induction configuration for responding to the object above seat.Capacitor induction type occupant classification system can use the measurement from induction electrode by the occupancy classi-fication of seat and determine whether the safety strap of reminding occupant to buckle well them.
According to another illustrative embodiments, induction system can use the multiple electrodes on the two opposite sides of thick foam block.Measurement can be carried out when electrode belongs to various configuration.According to another illustrative embodiments, weight induction concept can be combined with capacitive sensing concept or be incorporated in triangular web by induction system.Weight/pressure information can use to identify occupant conditions and produce preferred classification by the system integrated together with capacitance information.
According to various illustrative embodiments, induction system can make electronically to carry out measurement by capacitance (such as, using high-frequency electrical streaming to measure or other method).Sensor module material can comprise for any type of electrode conductive material (such as, copper, electrically conductive ink, conductive fiber etc.) and for any compressible material (such as, nonwoven batt, wool spinning material, foamed materials, the material flowed for the air allowed for induced ventilation climate seating or other material any that will be compressed significantly under the pressure being less than 1psi) of the distance piece between sensor and shielding part.
Generally with reference to accompanying drawing, describe a kind of occupant classification system, it uses sensor (such as, condenser vehicle sensors) to detect seat occupancy and to detect the weight on seat.Occupant classification system can comprise sensor and shielding part usually.In order to carry out occupant's induction, sensor directedly above shielding part can be positioned at the impact of the object (such as, seat heater) below shielding part for sensor measurement to reduce.Categorizing system can comprise weight or power sensing capability.When responding to weight, sensor and shielding part can switch orientation (such as with sensor directed below shielding part, via electronic switch) be placed on the impact of the object (such as, electronic machine) on the top of seat for sensor measurement to reduce.Occupant's induction type and weight or power inductive measuring can be used together to determine whether the object on seat is people and can reduces the possibility phonily detected by object as people.
With reference to Fig. 1, according to illustrative embodiments, vehicle 10 is shown as the occupant 12 had in the seat 14 of vehicle 10.Seat 14 can comprise occupancy classi-fication and checking system 16.As shown in fig. 1, below the region that the occupant 12 that occupant classification system 16 can be positioned at vehicle 10 in seat 14 usually sits, maybe can be positioned in other region of seat 14 or vehicle 10.
Occupant classification system 16 can generally include for respond to seat 14 take and by the described sensor, shielding part, the electronics package that take classification.Such as, sensor may be used for providing the measurement for object, described measurement with due to the electric conductivity of object and weight and the impact formed on a sensor is corresponding.The measurement carrying out sensor can be evaluated to determine object or the existence of occupant in seat 14.Occupant classification system 16 can comprise or be configured to operating ordinatedly with seat heating system and/or for other system of the seat 14 of vehicle 10.
Occupant classification system 16 comprises electric capacity or electric field sensor, and described electric capacity or electric field sensor comprise induction electrode.Capacitance-type sensor can respond to the characteristic of close, the position or weight etc. of such as object usually.Various measurements from induction electrode may be used for the existence of inspected object in seat.Such as, described system can measure the change (change of the electrical characteristics aspect such as, between conductive body) of electric capacity aspect.When occupant 12 is sitting on seat 14, described system can be changed with the existence being determined occupant 12 by occupant classification system 16 by Detection capacitance.
According to an embodiment, as shown in Figure 2 A, the occupant classification system 200 based on electric capacity comprises upper electrode 202 and lower planar electrodes 204.In the embodiment of Fig. 2 A, upper plane electrode 202 is induction electrodes 202, and lower planar electrodes 204 is bucking electrodes.During usual or general measurement pattern or configuration, system 200 detects change from the signal aspect of induction electrode (upper electrode 202 near occupant 206) to determine whether occupant exists.Bucking electrode (lower electrode 204) is positioned at below the induction electrode in seat.Induction electrode and bucking electrode can change to the power that difference is configured to measure on the surface of seat.
With reference to Fig. 2 B, in an illustrative embodiments, the rule of induction electrode and bucking electrode or function can switch when occupancy classi-fication and checking system operate in power or weight measurement pattern.In weight measurement pattern, it is more insensitive and may be used for determining the weight of occupant 206 that system 200 can be configured to existence for occupant.During weight measurement pattern, electric capacity or electric field induction use the measurement carried out from the lower electrode 204 (bucking electrode occupant's measurement of inductance) farthest away from occupant to perform, and switch to become bucking electrode near the upper electrode 202 of occupant 206.Electrode 202,204 can use the electronics that is configured to change the electric current flowing through electrode or mechanical switch to switch.Replacement use bottom induction electrode with what measure the existence of occupant is, in power or weight measurement pattern, the electronic machine of described system and/or software can be configured to electric capacity between survey sensor and shielding part (electrode 202,204) (or electric current or impedance).The electric capacity measured (or representing with electric capacity or electric current or the relevant measurement of impedance) can compared with threshold value.Difference between the value measured and threshold value can owing to the change of the relative position aspect of the sensor formed due to the power on seat.Measurement when can't help to carry out the conduction of occupant 206 or dielectric characterization significantly affect, can not can be measured by upper electrode 202 because of occupant 206 conductively-closed.
With reference to Fig. 2 C, when the power in seat bottom increases, the material 208 between sensor (electrode 204) and shielding part (electrode 202) is compressed.This compression causes electrode 202,204 closely to move, thus causes the correspondence of the electric capacity aspect between two electrodes 202,204 to increase.Electric capacity between electrode 202,204 (or measuring as any other of the instruction of the change of the relative position aspect between electrode 202,204) may be used for estimating power on the seat that applied by occupant 206.Power on seat may be used for distinguishing between occupant (that is, people) Yu non-inanimate object (such as, computing machine).
Fig. 3 A and 3B discloses another illustrative embodiments of electric capacity or Electric field occupancy classi-fication and checking system.The system 300 illustrated in figures 3 a and 3b is similar to the system 200 of Fig. 2 A-2C and the upper electrode 302 comprised for responding to occupant 306 and lower electrode 304.System 300 also comprises electronic machine 310 (such as, induction and signal madulation electronic machine), and described electronic machine is configured to provide electric current and signal with drive electrode 302,304 and provide measurement on electrode 302,304.
Occupancy classi-fication disclosed herein and checking system can comprise and control described system and receive from the controller of the various measurements of system unit (such as, induction electrode), treater or electronic control unit (ECU).Controller is configured to interact with other Vehicular system, such as Vehicle security system (such as, air bag and belt system).Signal can be provided to and indicate adult and whether be positioned at Vehicle security system in seat by controller, can start in appropriate circumstances to make safety device.Controller for occupant classification system can be integrated with the controller (such as, for the controller of Vehicle security system) for another Vehicular system.
Special in Fig. 3 A, according to an illustrative embodiments, system 300 comprises occupant's inductive mode or configuration for detecting occupant 306 while shielding is from the interference below system 300.System 300 comprises the switch 312 and the switch 314 comprising the shielding port 318 lower electrode 304 electricity being coupled to electronic machine 310 that upper electrode 302 electricity are coupled to the sensor port 316 of electronic machine 310.In the configuration of Fig. 3 A, upper electrode 302 is induction electrodes, and lower electrode 304 is bucking electrodes.
Referring now to Fig. 3 B, according to an illustrative embodiments, system 300 also comprises and reduces occupant 306 for the susceptibility of electrical characteristics and may be used for the weight of the weight determining occupant 306 or power inductive mode or configuration.In the embodiment of Fig. 3 B, be switched to grounding jumper 320 near the conductor of occupant 306 or upper electrode 302, and be switched to the sensor port 316 of electronic machine 310 away from the conductor of occupant 306 or lower electrode 308.In the configuration of Fig. 3 B, upper electrode 302 is bucking electrodes, and lower electrode 304 is induction electrodes.
The electronic machine 310 used by system can be to control the software of occupant classification system 300 and any analog or digital circuit.Similarly, according to various illustrative embodiments, switch 312,314 can be any electronics of the flowing can changing electric current or the switch that mechanically activates.Electronic machine 310 can be configured to the switching of master cock 312,314.Such as, system 300 usually can be in occupant and to respond in configuration and be only switched to weight induction and be configured for checking induction configuration and whether occupant be defined as adult's size.Alternatively, switching can be carried out with certain hour gap periods.
Weight or power measurement to be attached in electric field or capacitance measurement permission system object may look for capacitive sensing system 200,300 large (such as seeming as adult) but be separated between each in fact little situation or differentiation.Such as, the capacitance loading produced by the electronic machine on seat or electric noise, when being particularly inserted into 12 volts of accessory shoes in vehicle at those devices, the increase in the electric capacity measured can be caused in above sense node is positioned at masked nodes.Such electronic machine can comprise cell phone, smart phone, personal digital assistant (PDA), global positioning system (GPS), CD (such as, DVD, Blu-Ray etc.) player, notebook PC or other electronics package any.Electronic machine can seem large for capacitance-type sensor, because they are conductor and be coupled to grounding jumper well.Electronic machine on seat or other object are identified as adult mistakenly may arouse displeasure when vehicle safety belt reminiscences is opened.Above described illustrative embodiments solves unhappy problem by the power measurement of low cost being incorporated in capacitive sensing system.Weight induction configuration can also be used for identifying vacant seat chair and diagnose the problem that capacitive sensing system has, and same measurement electronic machine and from sensor draw connection may be used for weight measurement and capacitance measurement, cause the solution of low cost.
The illustrative embodiments of Fig. 2 and 3 electronically can be measured relative to the change in the relative physical location of shielding part at sensor and can't help to use the conduction of occupant or dielectric characterization significantly affect the electrode of any structure.According to Alternative exemplary embodiment, what substitute the electric capacity between detecting sensor and bucking electrode is, high frequency that described system can use the multiple measurements in multiple configuration to calculate only to flow between sensor and the shielding part AC electric current such as (such as, about 100 kilo hertzs, be greater than 100 kilo hertzs).The remarkable increase of the described electric current aspect measured indicates the increase of sensor to the electric capacity aspect of shielding part, and described increase indicates the change of the relative position aspect of sensor and the shielding part formed due to the power of the increase from occupant.Exemplary according to other, the electric capacity between sensor and bucking electrode can by analyzing the change of RC time constant aspect, system is measured for the change of leading to the electric charge aspect shared between the change of response aspect of stepped-up voltage of electrode, each electrode or any other method of measuring electric capacity.
Fig. 4 depicts representativeness according to the occupant detecting system 400 of an illustrative embodiments or exemplary circuit diagram.Occupant detecting system 400 comprises induction electrode 410, bucking electrode 412, interrupteur SW
dSand SW
load, and electronic machine 420 be electrically connected sensor circuit 402.Sensor circuit 402 also can comprise the signal generation device 406 be placed between electronic machine 420 and bucking electrode 412, such as amplifier or transistor.Induction electrode 410 can also comprise be placed on electronic machine 420 outside conductor, sense node or other device, such as indicating device.Bucking electrode 412 also can comprise and is placed on conductor between bucking electrode 412 and signal generation device 406 or other device, such as masked nodes.Although sensor circuit 402 illustrates in electronic machine 420 outside, electronic machine 420 can comprise the parts of sensor circuit 402, such as switch, amplifier or other device.Such as, the parts of electronic machine 420 and sensor circuit 402 can integral, be placed in common shell or be placed on public circuit plate, and induction and bucking electrode 410,412 is in housing exterior and electricity is coupled to electronic machine 420.But those of skill in the art will recognize that, according to other embodiment, other configuration is also possible.
Electronic machine 420 generally includes controller 422 and modulating apparatus 424.Modulating apparatus 424 generally includes sinewave output device 425, current sensing circuit 426 and separates mediation filter 427.Modulating apparatus 424 produces output signal, measures electric current, and produces the incoming signal corresponding with the electric current measured.
Controller 422 can be microprocessor or electronic control unit (ECU) and control occupant detecting system 400.Controller 422 determines when modulating apparatus 424 is producing output signal, by interrupteur SW
dSand SW
loadopen and close, and the incoming signal that decipher receives from modulating apparatus.
As described hereinafter further, system 400 can operate to carry out particular measurement, and described particular measurement may be used for the representativeness instruction of the power obtained on seat, such as when the weight of occupant promotes induction electrode 410 towards bucking electrode 412.Electronic machine 420 is for calculating the impedance between induction electrode 410 and bucking electrode 412, and described impedance can be used in occupancy classi-fication.Electronic machine 420 can also be used for calculating the impedance between induction electrode 410 and grounding jumper, and described impedance can be used in detecting occupant.Electronic machine 420 can also be used for calculating induction electrode 410 and bucking electrode 412 and grounding jumper impedance between the two to detect occupant and by occupancy classi-fication.
Controller 422 can be microprocessor or electronic control unit (ECU) and control occupant detecting system 400.Controller 422 determines when modulating apparatus 424 is producing output signal, by interrupteur SW
dSand SW
loadopen and close, and the incoming signal that decipher receives from modulating apparatus 424.
By by interrupteur SW
dSand SW
loadopen and close, the sensor circuit 402 of occupant detecting system 400 can be placed on (that is, interrupteur SW in four different configurations
dSand SW
loadbe respectively close/open, closedown/close, open/open and opening/closing).By SW
dSclose the amplitude of the output signal changed on bucking electrode 412, and by SW
loadclose impedance Z
sWbe incorporated between sensor and bucking electrode 410,412.
In each in four Circnit Layouts, electric current is measured by modulating apparatus 424, thus provides the value M of four current measurements
1, M
2, M
3, and M
4.M
1at SW
dSclose and SW
loadmeasured when opening, M
2at SW
dSclose and SW
loadmeasured during closedown, M
3at SW
dSopen and SW
loadmeasured when opening, and M
4at SW
dSopen and SW
loadmeasured during closedown.
According to these four current measurements, and the proportional numerical value (that is, the value of power) of impedance between induction electrode 410 and bucking electrode 412 is calculated as follows by controller 422:
This formula is derived and is drawn from following formula:
Numerical value
thus and impedance between induction electrode 410 and bucking electrode 412 proportional, and may be used for the relative to force determined on seat, so that by occupancy classi-fication.The occupancy classi-fication drawn can such as determining whether safety belt reminder should be opened or whether air bag should launch.
According to the value M of current measurement
1, M
2, M
3, and M
4, the numerical value (that is, detected value) corresponding with the impedance between induction electrode 410 and grounding jumper can also calculate as follows:
This formula draws from the following derivation of equation:
Wherein Z
sWto be cancelled and without the need to learning, but should be enough large meaningfully to change calculating, and Z
sensor/shieldfrom the above for
the derivation of equation draw.For i
occvalue and impedance proportional (that is, being inversely proportional to) between induction electrode 410 and grounding jumper, and may be used for the existence (that is, detecting occupant) determining occupant or object.
According to an illustrative embodiments, occupant detecting system can also comprise normalization circuit 404.Normalization circuit 404 allows electronic machine 420 for moving due to the gain in sensor circuit 402, side-play amount and the change of phase shifts aspect and the measurement change that formed regulates.
Normalization circuit 404 comprises high reference impedance device 442 and low reference impedance device 444, and each high reference impedance device and low reference impedance device have different known impedance.Corresponding interrupteur SW
refhiand SW
reflorespectively height and low reference impedance device 442,444 are optionally connected to grounding jumper.As embodiment, modulating apparatus 424 produces the AC electric current of the constant potential of 100 kilo hertzs and gauge reference target electric current M
refhiand M
reflo.Reference current M
refhiat SW
refhiclose and SW
reflomeasured when opening, and reference current M
refloat SW
refhiopen and SW
reflomeasured during closedown.
Sensor circuit 402 is configured with interrupteur SW
sensso that sensor circuit 402 and normalization circuit 404 are isolated.At current measurement M
1, M
2, M
3, and M
4when carrying out, SW
sensclose.At reference current M
refhiand M
reflowhen carrying out, SW
sensopen, thus normalization circuit 404 is isolated from sensor circuit 402.
By measuring the reference current M relative to the impedance means 442,444 of known impedance
refhiand M
refloand isolated from sensor circuit 402 by normalization circuit 404, microprocessor 422 can independent of the impedance of sensor circuit 402 computing system.By this way, microprocessor 422 can move for the gain in sensor circuit 402, side-play amount and make explanations more accurately detect occupant with the change of phase shifts aspect and by occupancy classi-fication.
According to various illustrative embodiments, shielding part can use and measure concept and any current potential of electronic hardware compatibility be associated or signal and drive.Such as, shielding part can use and be similar to sensor signal or the signal identical with sensor signal drives, can be connected to fixing DC level, maybe can use various signal to drive the multiple measurement concepts allowing above to mention.
Although occupant classification system 200,300 is illustrated as including the multiple features used with being fitted to each other, system 200,300 alternatively can use more or less pointed mechanism or feature.Such as, in other illustrative embodiments, more multi-electrode may be used in system 200,300.
Fig. 5 discloses occupant's induction and categorizing system 500.System 500 is combined with the element of system as above.System 500 can comprise seat heater.Seat heater can comprise back of seat heater element 512 and/or seat bottom heater element 514.Seat bottom heater element 514 is positioned at below seat cover or seat cushions 520.Heater element can be controlled by seat heater controller 516.Alternatively, same controller can be used in occupant's detection and responds to and seat heater.
System 500 comprises sensing pad 530, and described sensing pad comprises the induction electrode and bucking electrode that are separated by compressible material.Sensing pad 520 is placed in seat bottom, is placed under seating foam materials ideally.Sensor will use the electronic machine 310 relevant with weight induction pattern that above describe to measure weight on seat or power by the impedance calculated between induction electrode and bucking electrode.According to this embodiment of system 500, occupant can not be needed to respond to configuration (that is, the measurement based on electric capacity of induction electrode).Occupant detect will mainly based on power or weight induction measurements and calculations and carry out.Such as, the occupant of seat will be determined when the measurement of power exceedes the threshold value corresponding to specific dimensions occupant.In one embodiment, the actual weight of occupant without the need to being determined because the measurement of the impedance between induction electrode and bucking electrode can be used in the occupant being associated with specific dimensions.
System 500 comprises the controller 522 for controlling the control signal (such as, voltage or electric current) being provided to sensor mat 520 and induction and bucking electrode.Controller 522 is configured to execution occupancy classi-fication and/or detection is determined and respective signal is provided to other Vehicular system and subsystem via bus or other electrical connection.Controller 522 can be connected to vehicle communication bus via attaching parts 524.
According to alternate embodiments, the measurement that the signal transacting using occupant to respond to configuration and correspondence carries out can be used in determining seat damp condition.Seat humidity can affect the measurement carried out in weight induction configuration.Seat damp condition regulates for carrying out correspondence for the calculating performed based on the measurement using seat humidity to carry out really surely, and described seat humidity can be necessary information, because seat humidity will affect sensor with shield EMC measurement.Electric field or capacitor type is used to respond to detect seat damp condition such as open in U.S. Patent Publication 2007/0192007 (being bonded to this by reference).
The occupant detecting system 500 based on power or weight above described can operate to coordinate with seat belt tension sensor.Such as, as described in US patent number 6260879 (being bonded to this by reference), the power be applied to downwards on seat can be produced by two different components.One-component is attributable to the quality of occupant, and another component can be the power of the tension force being attributable to exist in vehicle safety belt.Harness tension survey sensor can be provided to determine result as harness tension and act on the amount of the power on seat downwards.As the tension force in the safety strap measured by seat belt tension sensor provides the instruction of the existence for the child seat linked closely or other object.
Although the given shape of each element is set forth in the accompanying drawings, each element can in other shape any of the function contributing to be performed by described element.Such as, electrode is shown as plane electrode, but in other illustrative embodiments, structure can limit the electrode of other shape.In addition, although the switch of particular form is illustrated in figure 3, according to other illustrative embodiments, switch in other form or can activate in different directions.The induction above described in detail and categorizing system can with existing occupant detecting system, such as describe in U.S. Patent application 12/541825 (being now US patent number 8138772) those together with use.This is bonded to by reference with its entirety in front patent application.
For object of the present disclosure, term " coupling " means and is bonded to each other directly or indirectly by two parts (electrically, machinery or magnetic).Such combination can be static in nature or is moveable in nature.Such combination can utilize two parts (electricity or machinery), ground integral with one another or any additional intermediate member being integrally defined as single entirety with described two parts and any additional member of being attached to each other to realize.Such combination can be permanent in nature or can be alternatively can to remove or releasable in nature.
The disclosure describes with reference to illustrative embodiments, but those of skill in the art will recognize that, when not leaving the spirit and scope of protected theme, can change in form and details.Such as, although different illustrative embodiments may be described to comprise the one or more features providing one or more benefit, but expectedly, described feature can be interchangeable with one another or be alternatively bonded to each other in described illustrative embodiments or in other alternate embodiments.Because technology of the present disclosure is relative complex, therefore also the change of not all technical elements is all foreseeable.Reference illustrative embodiments describes and the disclosure set forth in following claim is obviously intended to contain as far as possible extensively.Such as, unless dated especially in other cases, otherwise the claim quoting single concrete element also comprises multiple concrete element like this.
It is equally important that it should be noted that the structure of the element of system as shown in preferred and other illustrative embodiments and layout are only illustrative.Although only the embodiment of specific quantity is described in detail in the disclosure, but consult those of skill in the art of the present disclosure will readily recognize that, when substantially not leaving novel teachings and the advantage of quoted theme, much remodeling is all possible (such as, the change of the aspect such as use, color, orientation of the value of the ratio of size, dimension, structure, shape and various element, parameter, mounting arrangements, material).Such as, be shown as the element be integrally formed into be made up of multiple part or element, be shown as can being integrally formed into of multiple part, the operation of assembly can reverse or otherwise change, the length of the structure of system or width and/or component or attaching parts or other element can change, and the character or the numerical value that are configured in adjustment between each element or attachment position can change.It should be noted that element and/or the assembly of system can be made up of any material provided in the various materials of sufficient intensity or durability.Therefore, all remodeling so is all intended to included within the scope of the present disclosure.Other replacement scheme, remodeling, can to carry out in the design of preferred and other illustrative embodiments, operating conditions and layout when changing and be omitted in the spirit not leaving current topic.
Claims (21)
1., for detecting the system of the occupant in vehicle, described system comprises:
The induction electrode in the seat bottom of seat can be arranged on;
Be positioned at the bucking electrode in seat below induction electrode;
Operatively be coupled to the sensor circuit of induction electrode and bucking electrode;
Operatively be coupled to the controller of sensor circuit, its middle controller is configured to steering current by bucking electrode, and wherein sensor circuit is configured to signal to be provided to bucking electrode and the change of the weight detected owing to being positioned at the object on seat and the electric current aspect by bucking electrode that the induction electrode that formed causes relative to the change of the relative position aspect of bucking electrode.
2. the system as claimed in claim 1, the change that its middle controller is configured by based on electric current aspect calculates the change of the impedance aspect between bucking electrode and induction electrode by object classification.
3. system as claimed in claim 2, is ground connection when wherein the change of induction electrode in electric current is detected.
4. system as claimed in claim 2, its middle controller is configured to occupancy classi-fication based on the multiple measurements undertaken by sensor circuit.
5. system as claimed in claim 4, its middle controller determines whether to start seat belt indicator or air bag.
6. system as claimed in claim 4, wherein compressible material is placed between induction electrode and bucking electrode.
7. system as claimed in claim 2, wherein, sensor circuit is configured to signal to be provided to induction electrode, and wherein sensor circuit is configured to detect the change of leading to the electric current aspect of induction electrode formed due to the electric field influence characteristic of the object on seat; And its middle controller is configured to change based on the electric current aspect leading to induction electrode by object classification.
8. system as claimed in claim 2, also comprise the seat belt tension sensor being operatively coupled to controller, and its middle controller is configured to object classification based on the signal from seat belt tension sensor.
9., for detecting the system of the occupant in vehicle, described system comprises:
The induction electrode in the seat bottom of seat can be arranged on;
Be positioned at the bucking electrode in seat below induction electrode;
Operatively be coupled to the sensor circuit of induction electrode and bucking electrode;
Operatively be coupled to the controller of sensor circuit, multiple signal is applied to bucking electrode to configure sensor circuit by the operation of its middle controller;
Its middle controller is configured by the relative to force detecting and to be applied to seat by object, and the value that the result of the independent measurement performed when being applied to bucking electrode by be used in described multiple signal each calculates the power relevant to the impedance between induction electrode and bucking electrode detects the existence of the object in seat.
10. system as claimed in claim 9, wherein compressible material is placed between induction electrode and bucking electrode.
11. systems as claimed in claim 10, its middle controller determines whether to start seat belt indicator or air bag.
12. systems as claimed in claim 9, each in wherein said multiple signal is identical substantially.
13. systems as claimed in claim 9, one in wherein said multiple signal is applied to induction electrode, and its middle controller is configured by the calculating detected value relevant to the impedance from induction electrode to grounding jumper to detect the existence of moist seat.
14. systems as claimed in claim 13, wherein said multiple signal comprises first, second, and third signal, and the first signal is applied to induction electrode to configure sensor circuit and secondary signal and the 3rd signal are alternately applied to bucking electrode by the operation of its middle controller.
15. systems as claimed in claim 14, multiple impedance is alternately coupled between induction electrode and bucking electrode to configure sensor circuit by the operation of its middle controller; And wherein carry out when coupling impedance is in different configuration for the independent measurement in the calculating of the value of detected value and power.
16. systems as claimed in claim 15, wherein independent measurement is first, second, third and the 4th current measurement, and wherein the first and second current measurements are carried out when secondary signal is applied to bucking electrode, and the third and fourth current measurement is carried out when the 3rd signal is applied to bucking electrode.
17. systems as claimed in claim 16, wherein first and the 3rd current measurement carry out when described multiple impedance is not all coupled between induction electrode and bucking electrode, and second and the 4th current measurement carry out when described multiple impedance is coupled between induction electrode and bucking electrode.
18. systems as claimed in claim 9, also comprise the seat belt tension sensor being operatively coupled to controller, and its middle controller are configured to object classification based on the signal from seat belt tension sensor.
19. systems as claimed in claim 9, one in wherein said multiple signal is applied to bucking electrode, and its middle controller is configured to the weight that detects owing to being positioned at the object on seat and the change of the electric current aspect by bucking electrode that the induction electrode that formed causes relative to the change of the relative position aspect of bucking electrode.
20. systems as claimed in claim 19, its middle controller is configured by change in the impedance between bucking electrode and induction electrode that calculates and produce based on the change of electric current aspect by object classification.
21. systems as claimed in claim 20, wherein induction electrode is ground connection when controller detects the change in by the electric current of bucking electrode.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/633,590 US9278629B2 (en) | 2009-11-19 | 2012-10-02 | Occupant detection and classification system |
| US13/633,590 | 2012-10-02 | ||
| PCT/US2013/060891 WO2014055266A1 (en) | 2012-10-02 | 2013-09-20 | Occupant detection and classification system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104684764A true CN104684764A (en) | 2015-06-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380051102.XA Pending CN104684764A (en) | 2012-10-02 | 2013-09-20 | Occupant detection and classification system |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2903866A4 (en) |
| JP (1) | JP2016504227A (en) |
| CN (1) | CN104684764A (en) |
| WO (1) | WO2014055266A1 (en) |
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| CN106837021A (en) * | 2017-03-28 | 2017-06-13 | 成都因纳维特科技有限公司 | Vehicular intelligent child lock based on the sensing of children's seat interface |
| CN108622014A (en) * | 2017-03-24 | 2018-10-09 | 福特全球技术公司 | Steady seat harness uses sensor |
| CN108790980A (en) * | 2017-05-02 | 2018-11-13 | 福特全球技术公司 | Change effective control of system to the temperature in seat assembly for vehicles |
| CN110562180A (en) * | 2019-09-17 | 2019-12-13 | 浙江吉利汽车研究院有限公司 | Method and system for igniting safety airbag according to different passengers and vehicle |
| CN110612231A (en) * | 2016-12-23 | 2019-12-24 | 乔伊森安全系统收购有限责任公司 | System and method for detecting movement of an occupant seated in a vehicle |
| CN111051145A (en) * | 2017-06-30 | 2020-04-21 | 特斯拉公司 | Sensor and method for vehicle occupant classification system |
| CN111148652A (en) * | 2017-07-28 | 2020-05-12 | 乔伊森安全系统收购有限责任公司 | Sensor mat providing shielding and heating |
| CN112009485A (en) * | 2019-05-13 | 2020-12-01 | 现代自动车株式会社 | Passenger identification device for vehicle |
| US11211931B2 (en) | 2017-07-28 | 2021-12-28 | Joyson Safety Systems Acquisition Llc | Sensor mat providing shielding and heating |
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| DE102021214302A1 (en) * | 2021-12-14 | 2023-06-15 | Psa Automobiles Sa | Integrated control system for a motor vehicle seat |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2903866A1 (en) | 2015-08-12 |
| JP2016504227A (en) | 2016-02-12 |
| EP2903866A4 (en) | 2016-05-04 |
| WO2014055266A1 (en) | 2014-04-10 |
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